[DTP-1076, DTP-1077] Handle isolated create ops and site timeserials vector on the StateObject
#1924
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WalkthroughThe pull request includes significant modifications across multiple classes related to state management in a live objects context. Key changes involve the removal of certain parameters, such as Changes
Assessment against linked issues
Possibly related PRs
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Actionable comments posted: 5
🧹 Outside diff range and nitpick comments (19)
src/plugins/liveobjects/syncliveobjectsdatapool.ts (1)
21-21: Consider tracking class removal as technical debt.The TODO comment raises a valid architectural consideration. Since objects are now initialized directly from
StateObject, this class's responsibilities have been significantly reduced.Would you like me to create a GitHub issue to track the potential removal of this class after the
createOpchanges are fully implemented?src/plugins/liveobjects/liveobjects.ts (1)
Line range hint
131-136: Address TODO comments for channel state handling.There are unimplemented TODOs for handling detached/failed and suspended states. These should be addressed to ensure proper cleanup and state management.
Would you like me to help implement the missing channel state handlers or create GitHub issues to track these tasks?
test/common/modules/live_objects_helper.js (2)
181-196: LGTM: Enhanced map object state handlingThe changes effectively implement the new state handling approach:
- Replaced
regionalTimeserialwithsiteTimeserials- Separated initial and materialized entries
- Added conditional
createOpgenerationConsider adding JSDoc comments to document the purpose of
initialEntriesvsmaterialisedEntriesparameters, as this distinction is crucial for understanding the new state handling approach.mapObject(opts) { + /** + * @param {Object} opts + * @param {string} opts.objectId - The unique identifier for the map object + * @param {Object} opts.siteTimeserials - Vector of site-specific timeserials + * @param {Object} [opts.initialEntries] - Initial entries used to generate createOp + * @param {Object} opts.materialisedEntries - Current materialized state of the map + */ const { objectId, siteTimeserials, initialEntries, materialisedEntries } = opts;
201-215: LGTM: Enhanced counter object state handlingThe changes effectively implement the new state handling approach for counters, maintaining consistency with the map object changes:
- Replaced
regionalTimeserialwithsiteTimeserials- Separated initial and materialized counts
- Added conditional
createOpgenerationConsider adding JSDoc comments to document the purpose of
initialCountvsmaterialisedCountparameters:counterObject(opts) { + /** + * @param {Object} opts + * @param {string} opts.objectId - The unique identifier for the counter object + * @param {Object} opts.siteTimeserials - Vector of site-specific timeserials + * @param {number} [opts.initialCount] - Initial count used to generate createOp + * @param {number} opts.materialisedCount - Current materialized value of the counter + */ const { objectId, siteTimeserials, initialCount, materialisedCount } = opts;src/common/lib/client/realtimechannel.ts (1)
Line range hint
652-676: Consider adding error logging for state message handlingWhile the implementation handles state messages correctly, it would be beneficial to add error logging when state messages are received but the LiveObjects plugin is not available, similar to how presence messages are handled.
if (!this._liveObjects) { + Logger.logAction( + this.logger, + Logger.LOG_ERROR, + 'RealtimeChannel.processMessage()', + 'Received state message but LiveObjects plugin is not available' + ); return; }src/plugins/liveobjects/liveobjectspool.ts (1)
90-92: Correct typos in comments for better readabilityThere are minor typos in the comments that can be corrected to improve clarity.
Suggested changes:
- // we can create a zero-value object for the provided object id, and apply operation for that zero-value object. + // we can create a zero-value object for the provided object id and apply the operation to that zero-value object. - // since they need to ba able to eventually initialize themselves from that *_CREATE op. + // since they need to be able to eventually initialize themselves from that *_CREATE op.src/plugins/liveobjects/liveobject.ts (1)
114-125: Consider Simplifying_timeserialMapFromStringMapImplementationYou can simplify the
_timeserialMapFromStringMapmethod by usingObject.fromEntriesfor better readability and efficiency.Apply this refactor:
protected _timeserialMapFromStringMap(stringTimeserialsMap: Record<string, string>): Record<string, Timeserial> { - const objTimeserialsMap = Object.entries(stringTimeserialsMap).reduce( - (acc, v) => { - const [key, timeserialString] = v; - acc[key] = DefaultTimeserial.calculateTimeserial(this._client, timeserialString); - return acc; - }, - {} as Record<string, Timeserial>, - ); - - return objTimeserialsMap; + return Object.fromEntries( + Object.entries(stringTimeserialsMap).map(([key, timeserialString]) => [ + key, + DefaultTimeserial.calculateTimeserial(this._client, timeserialString), + ]), + ); }src/plugins/liveobjects/livecounter.ts (2)
20-21: Clarify the accessibility of thezeroValuemethodThe
zeroValuestatic method is marked as@internalin the documentation. If this method is intended for external use, consider updating the documentation to reflect its accessibility. If it should remain internal, ensure it's not exposed publicly.
30-33: Enhance consistency between static methodsThe
zeroValueandfromStateObjectstatic methods have different parameter orders and purposes. Consider aligning their parameter signatures or providing additional documentation to clarify their usage differences for better maintainability.test/realtime/live_objects.test.js (10)
Line range hint
489-496: Descriptive Test Case TitleThe test case description
"can apply MAP_CREATE with primitives state operation messages"is clear and accurately reflects the purpose of the test.Consider enhancing the test description for clarity:
- description: 'can apply MAP_CREATE with primitives state operation messages', + description: 'Should apply MAP_CREATE operations with primitive data types in state operation messages',
623-698: Potential Confusion with Duplicate Serial NumbersThe test injects operations using serial numbers where duplicates may cause confusion:
// Lines 654-659 'bbb@0-0', // existing site, earlier CGO, not applied 'bbb@1-0', // existing site, same CGO, not applied 'bbb@2-0', // existing site, later CGO, applied 'bbb@2-0', // existing site, same CGO (updated from last op), not applied 'aaa@0-0', // different site, earlier CGO, applied 'ccc@9-0', // different site, later CGO, appliedUsing the same serial
'bbb@2-0'may cause confusion in understanding which operation is being referred to.Consider updating serial numbers to be unique to improve clarity:
- 'bbb@2-0', // existing site, same CGO (updated from last op), not applied + 'bbb@3-0', // existing site, same CGO (updated from last op), not appliedAdjust comments accordingly to reflect the correct CGO and whether the operation should be applied.
Line range hint
748-756: Typo in Variable NameIn the comments, there is a typo where
counteris referred to instead ofmap:// Current code // create new objects and set on root await liveObjectsHelper.createAndSetOnMap(channelName, { mapObjectId: 'root', key: 'keyToCounter', createOp: liveObjectsHelper.counterCreateOp({ count: 1 }), }); await liveObjectsHelper.createAndSetOnMap(channelName, { mapObjectId: 'root', key: 'keyToMap', createOp: liveObjectsHelper.mapCreateOp({ entries: { stringKey: { data: { value: 'stringValue' } }, }, }), });Ensure consistency in comments and variable names:
- // create new objects and set on root + // Create new objects and set them on root // No changes to the code block, but ensure comments correctly describe operationsAdditionally, double-check that variable names correspond to the objects they represent to prevent confusion.
1045-1051: Improved Array InitializationThe array of
counterIdsis manually constructed. This can be simplified using array methods for better readability.Simplify
counterIdsinitialization:- const counterIds = [ - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - ]; + const counterIds = Array.from({ length: 5 }, () => liveObjectsHelper.fakeCounterObjectId());
923-985: Possible Misalignment of Comments and Serial NumbersIn the
MAP_REMOVEtest case, duplicate serial numbers and comments may cause confusion:// Lines 952-958 'bbb@0-0', // existing site, earlier site CGO, not applied 'bbb@1-0', // existing site, same site CGO, not applied 'bbb@2-0', // existing site, later site CGO, applied, site timeserial updated 'bbb@2-0', // existing site, same site CGO (updated from last op), not applied 'aaa@0-0', // different site, earlier site CGO, applied 'ccc@9-0', // different site, later site CGO, appliedConsider updating serial numbers for clarity and consistency. Ensure comments accurately reflect whether an operation should be applied based on the updated
siteTimeserials.
Line range hint
1366-1485: Complexity in Timeserial Logic TestingThe test case for buffered state operation messages involves complex logic with
siteTimeserials. While thorough, the test could benefit from additional comments or splitting into smaller functions for better readability.Consider refactoring the test to improve readability:
- Break the test into smaller, focused functions.
- Add detailed comments explaining each step, especially around the timeserial comparisons.
1045-1051: Typo in CommentThe comment mentions creating a "zero-value counter" using a
COUNTER_INCoperation, which might be confusing since incrementing would not create a zero value.Clarify the comment for better understanding:
- // send a COUNTER_INC op first to create a zero-value counter with forged site timeserials vector (from the op), and set it on a root. + // Send a COUNTER_INC op to create a counter initialized with a value and set it on the root, using forged site timeserials for testing.
827-834: Clarify Serial Number CommentsUsing the same serial number
'bbb@2-0'in consecutive iterations may cause confusion. The comments could be clearer about why operations are or aren't applied.Update serial numbers and comments for clarity:
'bbb@2-0', // existing site, later CGO, applied 'bbb@3-0', // existing site, same CGO (updated from last op), not appliedAdjust comments to match the serial numbers and explain the reasoning.
1047-1051: Redundant Fake Object ID GenerationGenerating fake counter object IDs in a hardcoded array could be replaced with a loop or array method for scalability.
Simplify code with array generation methods:
- const counterIds = [ - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - liveObjectsHelper.fakeCounterObjectId(), - ]; + const counterIds = Array.from({ length: 5 }, () => liveObjectsHelper.fakeCounterObjectId());
827-834: Consistency in Comment FormattingEnsure that comments consistently describe the operations, expected outcomes, and whether the operation is applied based on the
siteTimeserials.Review comments for accuracy and consistency.
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📒 Files selected for processing (11)
src/common/lib/client/realtimechannel.ts(1 hunks)src/plugins/liveobjects/livecounter.ts(5 hunks)src/plugins/liveobjects/livemap.ts(11 hunks)src/plugins/liveobjects/liveobject.ts(4 hunks)src/plugins/liveobjects/liveobjects.ts(6 hunks)src/plugins/liveobjects/liveobjectspool.ts(3 hunks)src/plugins/liveobjects/statemessage.ts(4 hunks)src/plugins/liveobjects/syncliveobjectsdatapool.ts(2 hunks)src/plugins/liveobjects/timeserial.ts(3 hunks)test/common/modules/live_objects_helper.js(2 hunks)test/realtime/live_objects.test.js(13 hunks)
🧰 Additional context used
📓 Learnings (1)
src/plugins/liveobjects/livecounter.ts (1)
Learnt from: VeskeR
PR: ably/ably-js#1897
File: src/plugins/liveobjects/livecounter.ts:93-93
Timestamp: 2024-11-12T07:31:53.691Z
Learning: In the `LiveCounter` class's `_applyCounterCreate` method, it's intentional to increment the counter's value using `+=` instead of initializing it with `=` because the counter may have a pre-existing non-zero value.
🪛 Biome (1.9.4)
src/plugins/liveobjects/statemessage.ts
[error] 154-154: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 158-158: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 162-162: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 166-166: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 170-170: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 195-195: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 224-224: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 230-230: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 259-259: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
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[error] 266-266: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
🔇 Additional comments (28)
src/plugins/liveobjects/syncliveobjectsdatapool.ts (2)
4-7: LGTM! Clean interface simplification.
The changes effectively streamline the data model by consolidating object data into StateObject, which aligns well with the PR objectives.
83-95: Verify the impact of simplified entry creation.
The entry creation methods have been streamlined to use only StateObject. While this simplification looks good, let's verify that all consumers properly handle this new structure.
✅ Verification successful
Let me gather more information about the usage of these properties in the files identified.
Let me check one more aspect to verify the state object handling in the codebase.
The simplified entry creation is safe and properly integrated
Based on the verification results:
- The StateObject interface shows that all necessary properties (counter, map, objectId, etc.) are properly defined and maintained
- LiveCounter and LiveMap constructors correctly handle the state objects and their properties
- All property accesses in the codebase are properly guarded with null checks (using
?.operator) - The validation logic in
overrideWithStateObjectmethods ensures data consistency
The simplified entry creation aligns well with the existing codebase structure and validation mechanisms.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for any direct access to removed properties in the codebase
# This will help ensure all consumers have been updated
# Search for any remaining references to old property names
echo "Checking for potential missed updates to object access patterns..."
rg -l 'objectData|regionalTimeserial|created|semantics' --type ts
# Look for LiveCounter/LiveMap instantiation patterns
echo "Checking LiveCounter/LiveMap usage patterns..."
ast-grep --pattern 'new LiveCounter($$$)' --lang ts
ast-grep --pattern 'new LiveMap($$$)' --lang ts
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# Check the actual usage context of these properties in relevant files
echo "Checking LiveCounter property access patterns..."
rg -A 2 -B 2 'objectData|created|semantics' src/plugins/liveobjects/livecounter.ts
echo "\nChecking LiveMap property access patterns..."
rg -A 2 -B 2 'objectData|created|semantics' src/plugins/liveobjects/livemap.ts
echo "\nChecking state message handling..."
rg -A 2 -B 2 'objectData|created|semantics' src/plugins/liveobjects/statemessage.ts
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rg -A 2 -B 2 'objectData|created|semantics' src/plugins/liveobjects/liveobjects.ts
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# Check state object handling in the codebase
echo "Checking StateObject usage patterns..."
ast-grep --pattern 'interface StateObject {
$$$
}' --lang ts
echo "\nChecking state object property access..."
rg -A 3 -B 1 'stateObject\.' src/plugins/liveobjects/
echo "\nChecking LiveCounter and LiveMap initialization..."
rg -A 5 'new (LiveCounter|LiveMap)' src/plugins/liveobjects/
Length of output: 12413
src/plugins/liveobjects/timeserial.ts (3)
12-16: LGTM! Clean interface addition.
The new siteCode property is well-documented and correctly marked as readonly, maintaining the immutable nature of timeserial values.
48-48: LGTM! Property implementation matches interface.
The siteCode property is correctly implemented as public readonly, maintaining consistency with the interface definition.
64-65: Verify the temporary site code parsing implementation.
While this implementation is marked as temporary (pending DTP-1078), there are some considerations:
- The hardcoded
slice(0, 3)assumes a specific format forseriesId. - There's no validation to ensure
seriesIdis at least 3 characters long.
Let's verify the seriesId format assumptions:
Consider adding validation or a fallback for cases where seriesId might be shorter than 3 characters, even though this is a temporary solution. This would help prevent potential runtime errors during the transition period.
✅ Verification successful
Let me gather more context about the timeserial format and validation by checking the full implementation.
Temporary site code parsing is safely implemented
The implementation is safe because:
- The
seriesIdis validated before object construction throughcalculateTimeserial()method, which throws an error for invalid timeserial formats - The
zeroValueTimeserial()method uses an empty string forseriesId, which safely results in an empty site code - The site code parsing is only used for comparison operations, where invalid/empty site codes won't cause runtime errors
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for seriesId usage and generation to verify format assumptions
rg -A 3 "seriesId.*=" --type ts
Length of output: 939
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# Get the full TimeSerial class implementation to understand validation and format
cat src/plugins/liveobjects/timeserial.ts
Length of output: 6318
src/plugins/liveobjects/liveobjects.ts (3)
155-157: LGTM! Clear and consistent state message handling.
The simplified approach to applying buffered state operations after SYNC data is clear and maintains proper ordering.
27-27: LGTM! Verify message handling compatibility.
The simplified type for _bufferedStateOperations aligns with the PR objectives to remove regional timeserial tracking.
Let's verify that all state message handlers are compatible with this change:
✅ Verification successful
Type change to _bufferedStateOperations is safe and properly handled
The verification shows that the type change from BufferedStateMessage[] to StateMessage[] is safe and properly implemented:
- The property is correctly initialized as an empty array in the constructor
- State messages are buffered during sync via
push(...stateMessages) - Buffered messages are properly applied using
applyStateMessages()and cleared afterward - The
StateMessageclass is properly imported and used throughout the codebase - No references to the old
BufferedStateMessagetype remain
🏁 Scripts executed
The following scripts were executed for the analysis:
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# Search for any remaining references to BufferedStateMessage
rg "BufferedStateMessage"
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ast-grep --pattern 'handleStateMessages($$$)'
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# Let's try a broader search for state message handling
rg -A 5 "_bufferedStateOperations"
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ast-grep --pattern 'handleStateMessages($$$) {
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89-99: Clarify site timeserials handling in state messages.
While the simplified buffering logic looks good, the PR objectives mention adopting siteTimeserials. Could you clarify how site timeserials are being handled in the state messages? This would help ensure the concurrent message handling during SYNC remains correct.
Let's check the StateMessage implementation:
✅ Verification successful
Let me check how the site timeserials are being handled in the state message processing by looking at the LiveObjectsPool implementation:
Let me try a different approach to find the site timeserials handling:
Based on the code analysis, I can now provide a final response:
Site timeserials are properly handled in the implementation
The implementation correctly handles site timeserials through:
StateMessageclass includesserialfield for timeserial formatLiveObjectbase class maintains_siteTimeserialsmap and implements logic to check if operations can be applied based on site timeserials- State messages are buffered during sync and applied afterward, preserving the correct ordering through site timeserials
- Both LiveMap and LiveCounter implementations properly update site timeserials when applying operations
The simplified buffering mechanism in handleStateMessages works correctly with the site timeserials implementation, as evidenced by the extensive test coverage verifying the behavior.
🏁 Scripts executed
The following scripts were executed for the analysis:
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#!/bin/bash
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ast-grep --pattern 'class StateMessage {
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applyStateMessages($$$) {
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$$$
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# Search for site timeserials related code
rg -i "sitetimeserial|site.?timeserial" -A 5
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test/common/modules/live_objects_helper.js (1)
104-106: LGTM: Map semantics field addition
The addition of the semantics field with value 0 in the map operation structure is consistent with the standardization of map operations.
Let's verify this is used consistently across the codebase:
✅ Verification successful
Semantics field is consistently used in map operations
The verification confirms that:
- The
semantics: 0field is consistently used in both map creation contexts (lines 105 and 187) - The
createOppattern shows this is part of the map object creation flow, used across multiple test scenarios - All map creation operations follow the same structure with semantics field
🏁 Scripts executed
The following scripts were executed for the analysis:
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#!/bin/bash
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ast-grep --pattern 'map: {
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rg -n "semantics.*[0-9]" test/common/modules/live_objects_helper.js
# Also search for map creation patterns
rg -n "map:\s*{" -A 3 test/common/modules/live_objects_helper.js
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rg -n "createOp" test/common/modules/live_objects_helper.js
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src/common/lib/client/realtimechannel.ts (2)
652-652: Confirm state message handling consistency
The implementation shows a clear distinction between regular state messages and state sync messages, with handleStateMessages and handleStateSyncMessages being called appropriately. The sync version correctly receives the channelSerial parameter while the regular version doesn't, which is consistent with the PR objectives.
Also applies to: 676-676
652-652: Verify removal of channelSerial parameter
The removal of the channelSerial parameter from handleStateMessages aligns with the PR objective to remove regionalTimeserial. However, let's verify that all related code paths have been updated accordingly.
✅ Verification successful
Removal of channelSerial parameter is part of broader refactoring
The changes are part of a larger refactoring that removes regionalTimeserial handling from state message processing. The code changes show:
- Removal of regionalTimeserial parameter from
handleStateMessages - Simplified buffering of state messages during sync
- Updated state object creation to use new
fromStateObjectfactory methods - Only one remaining reference to regionalTimeserial in a different context
The changes are consistent and properly implemented across the codebase.
🏁 Scripts executed
The following scripts were executed for the analysis:
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#!/bin/bash
# Description: Check for any remaining references to channelSerial in state message handling
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rg "handleStateMessages.*channelSerial"
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rg "regionalTimeserial"
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rg -A 5 "class LiveObjects" src/plugins/liveobjects/liveobjects.ts
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rg -A 10 "handleStateMessages" src/plugins/liveobjects/liveobjects.ts
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src/plugins/liveobjects/liveobjectspool.ts (3)
57-62: Simplify zero-value object creation
Removing the unnecessary regionalTimeserial parameter from zeroValue methods simplifies object initialization and improves code maintainability.
Line range hint 69-97: Efficient handling of state operations in applyStateMessages
The refactored applyStateMessages method enhances efficiency by creating zero-value objects when they do not exist and applying operations directly. This approach reduces complexity by eliminating the need for buffering operations.
96-96: Ensure non-null assertions are safe
The use of the non-null assertion operator ! assumes that this.get(stateOperation.objectId) will always return a valid object. Confirm that createZeroValueObjectIfNotExists reliably initializes the object to prevent potential runtime errors.
src/plugins/liveobjects/liveobject.ts (2)
137-137: Ensure Subclasses Override applyOperation with Updated Signature
The abstract method applyOperation now includes msg: StateMessage as a parameter. Please verify that all subclasses have updated their implementations of applyOperation to match the new method signature, to prevent runtime errors or TypeScript compilation issues.
Run the following script to verify that all subclasses have updated their applyOperation method:
✅ Verification successful
Let me analyze the implementations more thoroughly by checking the actual method signatures in the subclasses.
Let me try a different approach to get the full context of the implementations.
All Subclasses Correctly Implement Updated Method Signature
The verification shows that all subclasses (LiveMap and LiveCounter) have properly implemented the applyOperation method with the updated signature (op: StateOperation, msg: StateMessage): void, matching the abstract method definition in the parent class.
🏁 Scripts executed
The following scripts were executed for the analysis:
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#!/bin/bash
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rg --type ts --glob '!*liveobject.ts' 'applyOperation\s*\('
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ast-grep --pattern 'applyOperation($_, $_) {
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rg --type ts --glob '!*liveobject.ts' -B 2 -A 5 'applyOperation\s*\('
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150-150:
Implement the New Abstract Method overrideWithStateObject in Subclasses
The abstract method overrideWithStateObject(stateObject: StateObject): TUpdate has been added. Ensure that all subclasses implement this method to comply with the abstract class requirements and to prevent instantiation errors.
Run the following script to identify subclasses lacking the implementation of overrideWithStateObject:
✅ Verification successful
All Subclasses Have Implemented overrideWithStateObject
The verification shows that both direct subclasses of LiveObject (LiveCounter and LiveMap) have properly implemented the overrideWithStateObject method. The SyncLiveObjectsDataPool class, while appearing in the search results, is not a subclass of LiveObject and therefore doesn't need to implement this method.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: List subclasses of LiveObject that do not implement overrideWithStateObject.
# Find subclasses of LiveObject
rg --type ts 'class\s+\w+\s+extends\s+LiveObject' --files-with-matches | while read -r file; do
if ! rg 'overrideWithStateObject\s*\(' "$file" > /dev/null; then
echo "$file does not implement overrideWithStateObject"
fi
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Script:
#!/bin/bash
# Let's check the actual implementations in the subclasses to verify if they have the method
echo "=== LiveCounter implementation ==="
ast-grep --pattern 'class LiveCounter extends LiveObject {
$$$
overrideWithStateObject($$$) {
$$$
}
$$$
}' src/plugins/liveobjects/livecounter.ts
echo -e "\n=== LiveMap implementation ==="
ast-grep --pattern 'class LiveMap extends LiveObject {
$$$
overrideWithStateObject($$$) {
$$$
}
$$$
}' src/plugins/liveobjects/livemap.ts
# Also verify if there are any other subclasses we might have missed
echo -e "\n=== All LiveObject subclasses ==="
rg -l "extends\s+LiveObject"
Length of output: 744
Script:
#!/bin/bash
# Let's check the content of all files to see the actual implementations
echo "=== LiveCounter.ts content ==="
rg -A 5 -B 5 "class LiveCounter" src/plugins/liveobjects/livecounter.ts
echo -e "\n=== LiveMap.ts content ==="
rg -A 5 -B 5 "class LiveMap" src/plugins/liveobjects/livemap.ts
echo -e "\n=== SyncLiveObjectsDataPool.ts content ==="
rg -A 5 -B 5 "class SyncLiveObjectsDataPool" src/plugins/liveobjects/syncliveobjectsdatapool.ts
# Also check if there are any implementations of overrideWithStateObject in these files
echo -e "\n=== Searching for overrideWithStateObject implementations ==="
rg "overrideWithStateObject.*\{" -A 5 src/plugins/liveobjects/
Length of output: 2718
src/plugins/liveobjects/livecounter.ts (5)
Line range hint 43-61: Approved: Proper handling of operation application and timeserial management
The applyOperation method correctly verifies the objectId, calculates the operation's timeserial, and checks if the operation can be applied based on the site timeserials. The logging of skipped operations due to timeserial checks is appropriately detailed.
145-154: Approved: Intentional summing in _mergeInitialDataFromCreateOperation
The _mergeInitialDataFromCreateOperation method correctly uses += to sum the incoming count from the create operation with the existing data. This approach accommodates scenarios where the counter may already have a non-zero value and aligns with the intended logic.
165-178: Approved: Proper handling of multiple create operations
In _applyCounterCreate, the check for _createOperationIsMerged ensures that duplicate create operations are ignored, preventing inconsistent state. The logging provides clear insight into this decision, aiding in debugging if necessary.
124-134: Confirm the logic in overrideWithStateObject to prevent double-counting
In overrideWithStateObject, _dataRef is initialized with stateObject.counter?.count ?? 0, and then _mergeInitialDataFromCreateOperation adds stateOperation.counter?.count ?? 0 to _dataRef.data. Verify that summing both values is intentional to prevent double-counting the initial counter value.
Run the following script to ensure that the counts are being combined correctly and not counted twice:
✅ Verification successful
The addition of create operation's counter value is intentional and documented
The code explicitly documents that summing the incoming count from the create operation is intentional. From the implementation of _mergeInitialDataFromCreateOperation:
// note that it is intentional to SUM the incoming count from the create op.
// if we got here, it means that current counter instance is missing the initial value in its data reference,
// which we're going to add now.This is not a double-counting issue, but rather a deliberate design choice where:
- First,
_dataRefis initialized with the current state (stateObject.counter?.count ?? 0) - Then, if there's a create operation, its value is intentionally added to incorporate the initial value that was missing
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for potential double-counting in overrideWithStateObject.
# Look for all calls to overrideWithStateObject and analyze related state objects.
rg 'overrideWithStateObject' src/plugins/liveobjects/
# Inspect where stateObject.counter.count and stateObject.createOp.counter.count are set.
rg 'stateObject\.counter\?.count' -A 5 src/plugins/liveobjects/
rg 'stateObject\.createOp\.counter\?.count' -A 5 src/plugins/liveobjects/
Length of output: 1332
Script:
#!/bin/bash
# Let's examine the _mergeInitialDataFromCreateOperation implementation
ast-grep --pattern 'mergeInitialDataFromCreateOperation($_) {
$$$
}'
# Also check for any direct references to createOp.counter
rg 'createOp.*counter' -A 5 src/plugins/liveobjects/
# Look for any other methods that might modify _dataRef
ast-grep --pattern '_dataRef'
Length of output: 157
Script:
#!/bin/bash
# Let's try a different approach to find the implementation
rg '_mergeInitialDataFromCreateOperation' -A 10 src/plugins/liveobjects/livecounter.ts
# Also search for any methods that modify counter data
rg 'this\._dataRef.*data' -A 5 src/plugins/liveobjects/livecounter.ts
# Look for counter-related operations
rg 'counter\?' -A 5 src/plugins/liveobjects/livecounter.ts
Length of output: 2700
52-64: Verify the existence of siteCode in timeserials
Ensure that opOriginTimeserial.siteCode always exists in this._siteTimeserials before accessing or assigning to prevent potential undefined property access errors.
Run the following script to check for any cases where opOriginTimeserial.siteCode might be undefined:
✅ Verification successful
Let me gather more information about the initialization and usage of _siteTimeserials.
Let me check the initialization method _timeserialMapFromStringMap and the class constructor to understand how _siteTimeserials is initialized.
Let me try a different approach to find the initialization and type information.
Let me check the base class LiveObject to understand how _siteTimeserials is initialized.
Property access is safe, no changes needed
The code is safe because:
_siteTimeserialsis initialized as an empty object{}in the base classLiveObjectconstructor- Before accessing
_siteTimeserials[opOriginTimeserial.siteCode], the code calls_canApplyOperationwhich safely handles the case when the site code doesn't exist - The assignment to
_siteTimeserials[opOriginTimeserial.siteCode]is valid as it's adding a new entry to the object if it doesn't exist
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify that opOriginTimeserial.siteCode is always defined.
# Search for instantiations of DefaultTimeserial and ensure siteCode is set.
rg -A 3 'DefaultTimeserial\.calculateTimeserial' src/plugins/liveobjects/
# Ensure that all uses of opOriginTimeserial.siteCode are safe.
rg '\.siteCode' src/plugins/liveobjects/livecounter.ts
Length of output: 2927
Script:
#!/bin/bash
# Search for initialization of _siteTimeserials and its type definition
ast-grep --pattern 'class LiveCounter {
$$$
private _siteTimeserials: $_ = $_;
$$$
}'
# Search for any other places where _siteTimeserials is initialized or modified
rg -A 3 '_siteTimeserials' src/plugins/liveobjects/livecounter.ts
Length of output: 778
Script:
#!/bin/bash
# Search for _timeserialMapFromStringMap implementation
ast-grep --pattern 'private _timeserialMapFromStringMap($_) {
$$$
}'
# Search for LiveCounter constructor
ast-grep --pattern 'class LiveCounter {
$$$
constructor($_) {
$$$
}
$$$
}'
# Search for any type definitions related to siteTimeserials
rg -A 3 'interface.*State' src/plugins/liveobjects/livecounter.ts
Length of output: 229
Script:
#!/bin/bash
# Get the entire content of livecounter.ts to analyze initialization and types
cat src/plugins/liveobjects/livecounter.ts
# Also check for any base class that LiveCounter might extend
rg -A 3 'class LiveCounter extends' src/plugins/liveobjects/
Length of output: 7365
Script:
#!/bin/bash
# Get the content of LiveObject class
cat src/plugins/liveobjects/liveobject.ts
# Search for timeserialMapFromStringMap implementation
rg -A 10 '_timeserialMapFromStringMap' src/plugins/liveobjects/
Length of output: 8703
src/plugins/liveobjects/statemessage.ts (2)
107-114: LGTM on adding siteTimeserials and createOp to StateObject
The introduction of siteTimeserials and createOp properties aligns with the PR objectives outlined in DTP-1076 and DTP-1077. The typing and documentation are appropriate and accurately reflect the intended functionality.
244-244: Avoid using JSON.parse(JSON.stringify(...)) for deep copying when buffers are involved
This issue also applies to the deep copy of stateObject. Ensure that buffers are correctly copied by using a suitable deep copy method that handles Buffer and Uint8Array types.
test/realtime/live_objects.test.js (5)
113-113: Consistency in Handling State Messages
The processStateObjectMessageOnChannel method correctly updates to use siteTimeserials instead of regionalTimeserial. This change aligns with the PR objectives to remove regionalTimeserial and adopt siteTimeserials.
280-281: Proper Initialization of siteTimeserials and initialEntries
The siteTimeserials and initialEntries are correctly set on the mapObject, ensuring that the state object is properly initialized during tests.
1214-1222: Asynchronous Test Execution
In the loop over applyOperationsScenarios, ensure that all asynchronous operations are properly awaited to prevent unpredictable test execution.
Check that all promises in the test cases are correctly awaited.
923-986: Potential Shadowing of Variables
In the function scope, mapId is declared and used. Ensure that variable names are not shadowing or conflicting with other variables in the broader scope.
Check for variable shadowing:
Verify that mapId is not declared elsewhere in a conflicting scope.
1047-1051:
Ensure Unique Object IDs
When generating fake counter object IDs, it's important that they are unique to prevent collisions in tests.
Confirm that fakeCounterObjectId() produces unique IDs. If not, modify the implementation to guarantee uniqueness.
Run the following script to check for uniqueness:
Expect no output, indicating all IDs are unique.
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Actionable comments posted: 5
🧹 Outside diff range and nitpick comments (13)
src/plugins/liveobjects/syncliveobjectsdatapool.ts (2)
21-22: Consider creating a tracking issue for class evaluation.The TODO comment raises a valid architectural concern about the continued necessity of this class. Since this evaluation is outside the scope of the current PR objectives (DTP-1076, DTP-1077), it would be beneficial to track this separately.
Would you like me to help create a GitHub issue to track the evaluation of whether this class can be removed or simplified further?
Line range hint
50-80: Consider enhancing error logging details.While the error handling is good, the log messages could be more helpful for debugging by including the actual values received.
- `received unsupported state object message during SYNC, expected 'counter' or 'map' to be present, skipping message; message id: ${stateMessage.id}, channel: ${this._channel.name}`, + `received unsupported state object message during SYNC, expected 'counter' or 'map' to be present, skipping message; message id: ${stateMessage.id}, channel: ${this._channel.name}, received keys: ${Object.keys(stateObject).join(', ')}`,src/plugins/liveobjects/liveobjectspool.ts (1)
90-94: Well-documented architectural change for operation handling.The new approach of creating zero-value objects and allowing them to handle their own create operations is a clean architectural solution. The comments effectively explain the rationale behind this design decision.
Consider adding error logging for cases where operation application fails, to help with debugging in production.
src/plugins/liveobjects/liveobject.ts (2)
103-125: Consider adding error handling for invalid timeserial strings.The new methods look good, but
_timeserialMapFromStringMapmight benefit from error handling for invalid timeserial strings to prevent runtime errors.protected _timeserialMapFromStringMap(stringTimeserialsMap: Record<string, string>): Record<string, Timeserial> { const objTimeserialsMap = Object.entries(stringTimeserialsMap).reduce( (acc, v) => { const [key, timeserialString] = v; + try { acc[key] = DefaultTimeserial.calculateTimeserial(this._client, timeserialString); + } catch (error) { + this._client.logger.warn(`Invalid timeserial string: ${timeserialString}`, error); + // Skip invalid timeserial + } return acc; }, {} as Record<string, Timeserial>, ); return objTimeserialsMap; }
137-166: LGTM! Well-documented state handling changes.The abstract method changes are well-documented and align perfectly with the PR objectives. The performance optimization strategy of merging initial data only once is a good architectural decision.
A few architectural considerations to keep in mind:
- Ensure implementing classes maintain the same optimization guarantees
- Consider adding metrics to track the performance improvement
- Document the state transition diagram for future maintainers
src/plugins/liveobjects/livecounter.ts (2)
96-134: Consider refactoring validation logic for better maintainabilityThe validation logic contains repeated patterns and similar error messages. Consider extracting the validation into a separate method to improve maintainability.
+ private _validateStateObject(stateObject: StateObject): void { + const validateId = (id: string, context: string) => { + if (id !== this.getObjectId()) { + throw new this._client.ErrorInfo( + `Invalid state object: ${context} objectId=${id}; LiveCounter objectId=${this.getObjectId()}`, + 50000, + 500 + ); + } + }; + + validateId(stateObject.objectId, "state object"); + + if (!this._client.Utils.isNil(stateObject.createOp)) { + validateId(stateObject.createOp.objectId, "state object createOp"); + + if (stateObject.createOp.action !== StateOperationAction.COUNTER_CREATE) { + throw new this._client.ErrorInfo( + `Invalid state object: state object createOp action=${stateObject.createOp?.action}; LiveCounter objectId=${this.getObjectId()}`, + 50000, + 500 + ); + } + } + }
164-178: Consider clarifying the comment about object ID encodingThe comment about object ID encoding the operation could be more explicit about why this guarantees uniqueness of create operations.
- // There can't be two different create operation for the same object id, because the object id - // fully encodes that operation. This means we can safely ignore any new incoming create operations - // if we already merged it once. + // There can't be two different create operations for the same object id because: + // 1. The object id is derived from the create operation's unique properties + // 2. Any create operation with the same object id must be identical to the original + // Therefore, we can safely ignore subsequent create operations once the initial one is merged.src/plugins/liveobjects/liveobjects.ts (1)
155-157: Enhance comment clarity regarding operation orderThe implementation correctly applies buffered operations after SYNC data. Consider enhancing the comment to explicitly mention why this order is important:
- // should apply buffered state operations after we applied the SYNC data. - // can use regular state messages application logic + // Apply buffered state operations after SYNC data to ensure: + // 1. Base state is established from SYNC + // 2. Any concurrent updates are applied in order + // Using regular state messages application logic for consistencytest/common/modules/live_objects_helper.js (1)
181-196: LGTM! Consider adding parameter validationThe changes effectively separate initial and materialised state, aligning with the PR objectives. The code could benefit from parameter validation.
Consider adding parameter validation:
mapObject(opts) { const { objectId, siteTimeserials, initialEntries, materialisedEntries } = opts; + if (!objectId) { + throw new Error('objectId is required'); + } + if (!siteTimeserials) { + throw new Error('siteTimeserials is required'); + } const obj = {src/plugins/liveobjects/livemap.ts (1)
360-366: Improve error message handling for undefined mapThe error message uses optional chaining which could result in "undefined" being displayed in the error message.
Apply this diff to improve error handling:
- if (this._semantics !== op.map?.semantics) { + if (!op.map) { + throw new this._client.ErrorInfo( + `Cannot apply MAP_CREATE op on LiveMap objectId=${this.getObjectId()}: map is undefined`, + 50000, + 500, + ); + } + if (this._semantics !== op.map.semantics) { throw new this._client.ErrorInfo( - `Cannot apply MAP_CREATE op on LiveMap objectId=${this.getObjectId()}; map's semantics=${this._semantics}, but op expected ${op.map?.semantics}`, + `Cannot apply MAP_CREATE op on LiveMap objectId=${this.getObjectId()}; map's semantics=${this._semantics}, but op expected ${op.map.semantics}`, 50000, 500, ); }test/realtime/live_objects.test.js (3)
623-698: Add documentation for site timeserials vector rules.The test cases for site timeserials vector handling would benefit from additional documentation explaining:
- The format and components of timeserials (e.g., 'bbb@1-0')
- The rules for when operations are applied or rejected
- The significance of different site codes (aaa, bbb, ccc)
This would make the test cases more maintainable and easier to understand.
Add this documentation above the test:
/** * Timeserial format: <siteCode>@<cgo>-<serial> * where: * - siteCode: unique identifier for the site (e.g., 'aaa', 'bbb') * - cgo: causally-globally-ordered sequence number * - serial: operation sequence number * * Rules for applying operations: * 1. For existing site: apply if CGO is later than current * 2. For different site: apply if no conflicting operation exists * 3. Operations are buffered during sync and applied based on these rules */
Line range hint
1366-1480: Improve code readability with constants and descriptive names.The test code could be more maintainable with these improvements:
- Define constants for array indices
- Use more descriptive variable names
- Group related test cases
Consider this refactoring:
- const mapId = liveObjectsHelper.fakeMapObjectId(); - const counterId = liveObjectsHelper.fakeCounterObjectId(); + const TEST_MAP_ID = liveObjectsHelper.fakeMapObjectId(); + const TEST_COUNTER_ID = liveObjectsHelper.fakeCounterObjectId(); + // Operation types for clarity + const OP_TYPES = { + EARLIER_SITE_CGO: 'earlier site CGO', + SAME_SITE_CGO: 'same site CGO', + LATER_SITE_CGO: 'later site CGO', + DIFFERENT_SITE: 'different site' + }; + const testCases = [ + { serial: 'bbb@1-0', type: OP_TYPES.EARLIER_SITE_CGO }, + { serial: 'bbb@2-0', type: OP_TYPES.SAME_SITE_CGO }, + // ... other cases + ]; - for (const [i, serial] of [...].entries()) + for (const testCase of testCases)
1214-1220: Consider reorganizing test scenarios for better maintainability.The test scenarios could be better organized by:
- Grouping related scenarios into separate describe blocks
- Adding consistent error handling across all scenarios
- Using shared setup functions for common test patterns
Consider this structure:
describe('Operation Application', () => { beforeEach(setupTestEnvironment); describe('During Sync', () => { // Sync-related scenarios }); describe('Site Timeserials', () => { // Timeserial-related scenarios }); }); function setupTestEnvironment() { // Common setup code }
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (10)
src/common/lib/client/realtimechannel.ts(1 hunks)src/plugins/liveobjects/livecounter.ts(5 hunks)src/plugins/liveobjects/livemap.ts(11 hunks)src/plugins/liveobjects/liveobject.ts(4 hunks)src/plugins/liveobjects/liveobjects.ts(6 hunks)src/plugins/liveobjects/liveobjectspool.ts(3 hunks)src/plugins/liveobjects/statemessage.ts(4 hunks)src/plugins/liveobjects/syncliveobjectsdatapool.ts(2 hunks)test/common/modules/live_objects_helper.js(2 hunks)test/realtime/live_objects.test.js(13 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- src/common/lib/client/realtimechannel.ts
🧰 Additional context used
📓 Learnings (2)
src/plugins/liveobjects/livecounter.ts (1)
Learnt from: VeskeR
PR: ably/ably-js#1897
File: src/plugins/liveobjects/livecounter.ts:93-93
Timestamp: 2024-11-12T07:31:53.691Z
Learning: In the `LiveCounter` class's `_applyCounterCreate` method, it's intentional to increment the counter's value using `+=` instead of initializing it with `=` because the counter may have a pre-existing non-zero value.
src/plugins/liveobjects/syncliveobjectsdatapool.ts (1)
Learnt from: VeskeR
PR: ably/ably-js#1897
File: src/plugins/liveobjects/syncliveobjectsdatapool.ts:57-57
Timestamp: 2024-11-12T07:31:53.691Z
Learning: When methods with the same name exist in different classes, references to these methods may remain valid even if a similar method is renamed in another class.
🪛 Biome (1.9.4)
src/plugins/liveobjects/statemessage.ts
[error] 154-154: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 158-158: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 162-162: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 166-166: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 170-170: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 195-195: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 224-224: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 230-230: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 259-259: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 266-266: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
🔇 Additional comments (22)
src/plugins/liveobjects/syncliveobjectsdatapool.ts (2)
4-18: LGTM! Clean interface refactoring.
The simplified imports and interface updates align well with the PR objectives. The transition to using StateObject directly in the interfaces provides a more cohesive data model.
82-95: Verify method signature changes across the codebase.
The simplified method signatures look good, but let's ensure all callers have been updated to handle the new parameter list.
✅ Verification successful
Method signature changes are correctly implemented
The verification shows that both methods are only called internally within the SyncLiveObjectsDataPool class, and all calls have been updated to use the simplified signature with just the stateObject parameter. The changes are consistent throughout the codebase.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for any calls to these methods to verify they've been updated
ast-grep --pattern $'_createLiveCounterDataEntry($$$)'
ast-grep --pattern $'_createLiveMapDataEntry($$$)'
Length of output: 107
Script:
#!/bin/bash
# Search for method calls with ripgrep for better pattern matching
rg "_createLiveCounterDataEntry" -A 2
rg "_createLiveMapDataEntry" -A 2
# Also search for the class name to understand the context
rg "class.*SyncLiveObjectsDataPool" -A 5
Length of output: 1894
src/plugins/liveobjects/liveobjectspool.ts (3)
6-6: LGTM! Import changes align with simplified state handling.
The removal of BufferedStateMessage and DefaultTimeserial imports, while adding direct StateMessage imports, reflects the architectural shift towards simplified state handling.
Also applies to: 8-8
57-57: Verify the removal of regionalTimeserial parameter.
The removal of regionalTimeserial from zero value creation aligns with the PR objectives. However, let's ensure this change doesn't affect existing functionality.
Also applies to: 62-62
✅ Verification successful
Based on the comprehensive test file analysis, I can now provide a definitive response about the removal of regionalTimeserial parameter.
Removal of regionalTimeserial parameter is safe and aligns with the codebase
The test file confirms that the zero value creation functionality works without regionalTimeserial parameter, and there are no existing dependencies on this parameter. The tests demonstrate that:
- Zero value objects are created and managed correctly without regionalTimeserial
- The state synchronization and operations work properly with the simplified object creation
- All test cases pass without requiring regionalTimeserial parameter
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for any remaining references to regionalTimeserial to ensure complete removal
rg -i "regionalTimeserial"
# Search for tests covering zero value creation
rg -l "zeroValue.*test"
Length of output: 52
Script:
#!/bin/bash
# Let's search for LiveMap.zeroValue and LiveCounter.zeroValue usage patterns
ast-grep --pattern 'LiveMap.zeroValue($$$)'
ast-grep --pattern 'LiveCounter.zeroValue($$$)'
# Let's also check the implementation of these methods
rg -A 5 "zeroValue.*=.*function"
rg -A 5 "zeroValue.*=.*\("
# Look for test files related to LiveMap and LiveCounter
fd -e ts -e js "live(map|counter).*test"
Length of output: 1302
Script:
#!/bin/bash
# Let's check the implementation of LiveMap and LiveCounter classes
ast-grep --pattern 'class LiveMap {
$$$
static zeroValue($$$) {
$$$
}
$$$
}'
ast-grep --pattern 'class LiveCounter {
$$$
static zeroValue($$$) {
$$$
}
$$$
}'
# Let's also look for any tests that might cover these classes
fd "live" -e test.ts -e test.js
Length of output: 252
Script:
#!/bin/bash
# Let's examine the test file to see how zero values are tested
cat test/realtime/live_objects.test.js
# Let's also check for any historical usage of regionalTimeserial in the git history
git log -S "regionalTimeserial" --oneline
Length of output: 87598
96-96: Verify handling of race conditions in operation application.
The direct application of operations to zero-value objects could potentially lead to race conditions if operations arrive out of order. Please ensure that:
- Create operations are properly handled even if they arrive after other operations
- The state remains consistent when operations are applied to zero-value objects
✅ Verification successful
Race conditions in operation application are properly handled
The codebase has robust mechanisms to handle operation ordering and race conditions:
- Operations are ordered using a vector clock system with timeserials (timestamp + site code + counter), ensuring consistent ordering across distributed clients
- Each object maintains a site timeserials vector to track the last applied operation from each site
- Operations are only applied if their timeserial is strictly greater than the stored timeserial for that site
- During sync, operations are buffered and applied in order after the sync completes
- Zero-value objects handle operations correctly through the timeserial comparison mechanism
The implementation ensures that:
- Create operations arriving late are handled correctly through timeserial comparison
- Operations cannot be applied out of order due to the vector clock system
- State remains consistent through proper operation ordering and buffering
The code shows a well-designed distributed state management system that properly handles concurrent operations and race conditions.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for test cases covering operation ordering
rg -A 5 "test.*operation.*order"
# Look for error handling in operation application
ast-grep --pattern 'applyOperation($_) {
try {
$$$
} catch {
$$$
}
}'
Length of output: 120
Script:
#!/bin/bash
# Search for applyOperation implementation to understand operation handling
ast-grep --pattern 'applyOperation($params) {
$$$
}'
# Look for operation ordering or sequence handling
rg -l "operation.*sequence|sequence.*operation|order.*operation"
# Search for create operation handling
rg -A 5 "case\s+['\"](create|CREATE)['\"]"
# Check LiveObjectsPool implementation for operation handling
rg -A 10 "class LiveObjectsPool"
Length of output: 1056
Script:
#!/bin/bash
# Check test file for operation ordering tests
cat test/realtime/live_objects.test.js
# Look for LiveObject class implementation to understand operation handling
ast-grep --pattern 'class LiveObject {
$$$
}'
# Search for sequence number or timestamp handling in operations
rg -A 5 "sequence.*number|timestamp|orderBy"
Length of output: 105380
Script:
#!/bin/bash
# Search for operation ordering in LiveObjectsPool
rg -A 10 "applyOperation|processStateOperation" src/plugins/liveobjects/liveobjectspool.ts
# Look for state sync and operation buffering
rg -A 10 "STATE_SYNC|_buffer" src/plugins/liveobjects/
# Check for timeserial or vector clock handling
rg -A 5 "timeserial|siteTimeserials|vector" src/plugins/liveobjects/
Length of output: 29652
src/plugins/liveobjects/liveobject.ts (3)
44-54: LGTM! Constructor changes align with objectives.
The simplified constructor with proper initialization of new fields and clear documentation of the empty timeserials vector purpose looks good.
Line range hint 90-102: LGTM! Good optimization for update notifications.
The noop check prevents unnecessary event emissions, which is a good optimization.
4-4: LGTM! Verify StateObject usage across codebase.
The new imports and properties align well with the PR objectives. The _dataRef documentation clearly explains its purpose in combining initial and state operations.
Also applies to: 40-42
✅ Verification successful
StateObject import and usage is consistent across the codebase
The StateObject interface is properly defined in statemessage.ts and is consistently used across the live objects implementation:
- Used as a type in
LiveObjectDataEntryfor state management - Imported and referenced in all relevant live object files (LiveCounter, LiveMap, LiveObject)
- Interface properly defines required properties (objectId, siteTimeserials)
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Length of output: 469
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ast-grep --pattern 'StateObject' -A 10
Length of output: 2955
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rg "interface StateObject" -A 5
Length of output: 538
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rg "implements StateObject" -A 5
Length of output: 34
src/plugins/liveobjects/livecounter.ts (3)
20-33: LGTM: Clean implementation of factory methods
The simplified zeroValue and new fromStateObject static methods provide clear and type-safe ways to instantiate LiveCounter objects. The implementation aligns well with the PR objectives of streamlining state object handling.
145-154: LGTM: Correct implementation of initial data merging
The implementation correctly uses += for merging the initial counter value, which aligns with the previous learning that counters may have pre-existing non-zero values.
52-64: Verify the timing of site timeserial updates
The site timeserial is updated before the operation is actually processed. While the comment indicates this is intentional, it's worth verifying that this doesn't lead to missed operations in case of subsequent failures.
✅ Verification successful
Let me gather more context about the operation processing and error handling.
Let me try a different approach to understand the operation handling flow.
Based on the gathered evidence, I can now generate the final response:
Early timeserial update is safe and intentional
The early update of site timeserial before operation processing is correct and safe because:
- All operation failures are handled through explicit throws that will prevent any subsequent operations
- The increment operation (
_applyCounterInc) is a simple atomic operation that cannot fail - The create operation (
_applyCounterCreate) either succeeds or returns a no-op - The comment accurately reflects the design intent - marking operations as processed is independent of their success
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Length of output: 985
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ast-grep --pattern 'private _apply$_($$$) {
$$$
}'
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$$$
}'
Length of output: 116
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rg -A 10 "_applyCounter" src/plugins/liveobjects/
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rg -B 2 -A 5 "throw|catch|error" src/plugins/liveobjects/livecounter.ts
Length of output: 5506
src/plugins/liveobjects/liveobjects.ts (4)
27-27: LGTM: Type simplification aligns with objectives
The change from BufferedStateMessage[] to StateMessage[] simplifies the state message handling, which aligns well with the PR objectives.
198-200: LGTM: Batch notifications improve performance
The implementation correctly batches notifications to ensure clients are notified only once after all changes are applied.
210-214: Verify factory method implementations
The switch to factory methods aligns with the objective to handle the new createOp field.
Let's verify the factory method implementations:
✅ Verification successful
Factory methods correctly handle state object initialization
The verification confirms that both LiveCounter and LiveMap have proper fromStateObject factory methods that:
- Create new instances with required parameters from the state object
- Apply state using
overrideWithStateObject - Handle the state object interface which includes the new
createOpfield
The implementation aligns with the objective to support the createOp field in the StateObject interface.
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# Check LiveCounter and LiveMap factory method implementations
ast-grep --pattern 'static fromStateObject($_: $_) {
$$$
}'
# Check for createOp handling in the factory methods
rg -A 5 "createOp.*fromStateObject" || rg -A 5 "fromStateObject.*createOp"
Length of output: 139
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ast-grep --pattern 'class LiveCounter {
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$$$
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# Also search for any fromStateObject method mentions
rg "fromStateObject" -A 5
Length of output: 1770
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ast-grep --pattern 'overrideWithStateObject($$$) {
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Length of output: 1004
89-99: Verify concurrent message handling during SYNC
The simplified state message handling looks good and aligns with the objective to remove regional timeserial. The buffering logic for concurrent messages during SYNC is clearer.
Let's verify the concurrent message handling implementation across the codebase:
✅ Verification successful
Based on the gathered evidence, I can now provide the final response:
Concurrent message handling during SYNC is properly implemented
The implementation correctly handles concurrent state messages during SYNC by:
- Buffering incoming messages in
_bufferedStateOperationswhile sync is in progress - Clearing the buffer at the start of a new sync
- Applying all buffered messages after sync completion
- Emitting a
SyncCompletedevent that clients can await
The code follows a clear and consistent pattern for managing state synchronization, with proper cleanup and event handling.
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rg "handleStateMessages.*error" || rg "error.*handleStateMessages"
Length of output: 141
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rg -A 10 "describe.*LiveObjects.*state.*messages?" || rg -A 10 "test.*state.*messages?"
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ast-grep --pattern 'handleStateMessages($$$) { $$$_syncInProgress$$$ }'
# Look for buffered state operations handling
rg -A 5 "_bufferedStateOperations"
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ast-grep --pattern 'class LiveObjectsPool { $$$ applyStateMessages($$$) { $$$ } $$$ }'
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rg -A 10 "SyncCompleted"
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rg -A 5 "applyStateMessages.*catch" || rg -A 5 "try.*applyStateMessages"
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test/common/modules/live_objects_helper.js (2)
201-215: LGTM! Consistent implementation with mapObject
The changes mirror the mapObject pattern, correctly handling both initial and materialised states. The null check for initialCount is appropriate as it allows 0 as a valid count.
104-106: Verify the semantics field usage across the codebase
The addition of semantics: 0 in the map creation operation appears to be a new versioning or type identifier. Let's verify its usage and handling.
✅ Verification successful
The semantics field is correctly used for LiveMap versioning
The semantics field is properly integrated into the LiveMap implementation:
- It's consistently initialized to 0 in test helpers
- LiveMap validates semantics field matches during state object loading and operation application
- Mismatched semantics trigger appropriate error messages
🏁 Scripts executed
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#!/bin/bash
# Search for other occurrences of map semantics field to ensure consistent usage
rg -g '!*.{json,lock}' 'semantics.*:.*0'
rg -g '!*.{json,lock}' 'map.*semantics'
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src/plugins/liveobjects/statemessage.ts (2)
107-115: LGTM! Well-documented interface changes
The addition of siteTimeserials and createOp to the StateObject interface is well-structured and thoroughly documented. The changes align perfectly with the PR objectives of handling site timeserials and isolated create operations.
320-331: LGTM! Clean implementation of JSON encoding
The changes to toJSON() properly handle the encoding of operations and objects, with clear separation between base64 and binary encoding paths.
src/plugins/liveobjects/livemap.ts (3)
132-144: LGTM! Good improvements to operation handling
The changes improve the operation handling by:
- Correctly updating site timeserials before processing the operation
- Adding detailed logging for skipped operations
- Properly calculating operation origin timeserial
461-468: Add entry.data validation
The method accesses entry.data properties without validation, which could cause runtime errors if entry.data is undefined. This matches a previous review comment that's still valid.
Line range hint 1-484: Overall implementation looks good!
The changes successfully implement the PR objectives:
- Proper handling of isolated create operations
- Correct implementation of site timeserials vector
- Thorough validation of state objects
The core functionality is solid, though there are some safety improvements needed around optional chaining and non-null assertions as noted in the specific comments.
| } | ||
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|
||
| export type AnyDataEntry = LiveCounterDataEntry | LiveMapDataEntry; | ||
|
|
||
| // TODO: investigate if this class is still needed after changes with createOp. objects are now initialized from the stateObject and this class does minimal processing |
There was a problem hiding this comment.
Could the copy of the pool for sync just be a LiveObjectsPool instance? Maybe not, in order to preserve data refs?
There was a problem hiding this comment.
it's not even a copy of anything at this point, SyncLiveObjectsDataPool just buffers incoming state objects during sync and that's all.
the caller class, LiveObjects, then just gets the full array of buffered state objects and "applies the sync" by actully creating new objects/overriding existing ones.
I'll keep this SyncLiveObjectsDataPool class around for a bit, until all api is in and we're a bit closer to the stable protocol. If at that point it still does as little as it does in this PR, I'll just move buffering to the caller LiveObjects class (it already does buffering of state ops, so seems reasonable to also buffer state objects).
… update object for MAP_REMOVE ops
Resolves DTP-1077
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (5)
src/plugins/liveobjects/liveobject.ts (1)
114-125: Consider error handling for invalid timeserial strings.The
_timeserialMapFromStringMapmethod should handle potential invalid timeserial strings gracefully.protected _timeserialMapFromStringMap(stringTimeserialsMap: Record<string, string>): Record<string, Timeserial> { const objTimeserialsMap = Object.entries(stringTimeserialsMap).reduce( (acc, v) => { const [key, timeserialString] = v; + try { acc[key] = DefaultTimeserial.calculateTimeserial(this._client, timeserialString); + } catch (error) { + this._client.logger.warn(`Invalid timeserial string: ${timeserialString}`, error); + } return acc; }, {} as Record<string, Timeserial>, ); return objTimeserialsMap; }src/plugins/liveobjects/liveobjects.ts (1)
Line range hint
198-214: Consider adding error handling for state object operations.While the implementation looks good, consider adding error handling for potential issues during state object operations:
- State object validation before override
- Error handling in factory methods
- Validation of update objects before notification
Example error handling:
const update = existingObject.overrideWithStateObject(entry.stateObject); if (!update) { this._client.Logger.logAction( this._client.logger, this._client.Logger.LOG_ERROR, 'LiveObjects._applySync()', `Failed to override state for object ${objectId}` ); continue; }src/plugins/liveobjects/livemap.ts (2)
186-240: Consider extracting validation logic into separate methodsThe validation logic in
overrideWithStateObjectis complex and could be made more maintainable by extracting it into separate validation methods.Consider refactoring like this:
+ private _validateStateObjectId(stateObject: StateObject): void { + if (stateObject.objectId !== this.getObjectId()) { + throw new this._client.ErrorInfo( + `Invalid state object: state object objectId=${stateObject.objectId}; LiveMap objectId=${this.getObjectId()}`, + 50000, + 500, + ); + } + } + + private _validateMapSemantics(map: StateObject['map']): void { + if (!map || map.semantics !== this._semantics) { + throw new this._client.ErrorInfo( + `Invalid state object: state object map semantics=${map?.semantics}; LiveMap semantics=${this._semantics}`, + 50000, + 500, + ); + } + } + + private _validateCreateOp(createOp: StateOperation): void { + if (createOp.objectId !== this.getObjectId()) { + throw new this._client.ErrorInfo( + `Invalid state object: state object createOp objectId=${createOp.objectId}; LiveMap objectId=${this.getObjectId()}`, + 50000, + 500, + ); + } + // ... rest of create op validation + } overrideWithStateObject(stateObject: StateObject): LiveMapUpdate { - if (stateObject.objectId !== this.getObjectId()) { - // ... validation logic - } - if (stateObject.map?.semantics !== this._semantics) { - // ... validation logic - } + this._validateStateObjectId(stateObject); + this._validateMapSemantics(stateObject.map); if (!this._client.Utils.isNil(stateObject.createOp)) { - // ... validation logic + this._validateCreateOp(stateObject.createOp); } // ... rest of the method }
346-369: Consider adding debug logging for create operation mergingThe create operation merging logic would benefit from additional debug logging to help diagnose issues in production.
Add logging for successful merges:
private _applyMapCreate(op: StateOperation): LiveMapUpdate | LiveObjectUpdateNoop { if (this._createOperationIsMerged) { // ... existing logging for skipped merges return { noop: true }; } if (this._semantics !== op.map?.semantics) { throw new this._client.ErrorInfo( `Cannot apply MAP_CREATE op on LiveMap objectId=${this.getObjectId()}; map's semantics=${this._semantics}, but op expected ${op.map?.semantics}`, 50000, 500, ); } - return this._mergeInitialDataFromCreateOperation(op); + const update = this._mergeInitialDataFromCreateOperation(op); + this._client.Logger.logAction( + this._client.logger, + this._client.Logger.LOG_MICRO, + 'LiveMap._applyMapCreate()', + `successfully merged MAP_CREATE op; objectId=${this._objectId}`, + ); + return update; }test/realtime/live_objects.test.js (1)
Line range hint
1-2112: Consider enhancing test documentation and coverageWhile the test suite is comprehensive and well-structured, consider these improvements:
- Add detailed comments explaining the timeserial logic in complex scenarios
- Consider adding performance tests with large datasets to validate scalability
- Add tests for concurrent operations to ensure thread safety
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (11)
src/common/lib/client/realtimechannel.ts(1 hunks)src/plugins/liveobjects/livecounter.ts(5 hunks)src/plugins/liveobjects/livemap.ts(11 hunks)src/plugins/liveobjects/liveobject.ts(4 hunks)src/plugins/liveobjects/liveobjects.ts(6 hunks)src/plugins/liveobjects/liveobjectspool.ts(3 hunks)src/plugins/liveobjects/statemessage.ts(4 hunks)src/plugins/liveobjects/syncliveobjectsdatapool.ts(2 hunks)src/plugins/liveobjects/timeserial.ts(3 hunks)test/common/modules/live_objects_helper.js(2 hunks)test/realtime/live_objects.test.js(21 hunks)
🚧 Files skipped from review as they are similar to previous changes (5)
- src/common/lib/client/realtimechannel.ts
- src/plugins/liveobjects/livecounter.ts
- src/plugins/liveobjects/syncliveobjectsdatapool.ts
- src/plugins/liveobjects/timeserial.ts
- test/common/modules/live_objects_helper.js
🧰 Additional context used
🪛 Biome (1.9.4)
src/plugins/liveobjects/statemessage.ts
[error] 154-154: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 158-158: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 162-162: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 166-166: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 170-170: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 195-195: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 224-224: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 230-230: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 259-259: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 266-266: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
🔇 Additional comments (23)
src/plugins/liveobjects/liveobjectspool.ts (4)
6-6: LGTM! Import changes align with refactoring goals
The simplified imports reflect the removal of buffered message handling and the shift towards direct state message processing.
Also applies to: 8-8
57-57: LGTM! Simplified zero value object creation
The removal of regionalTimeserial from zero value creation aligns with the PR objectives and simplifies object initialization. Objects can now handle their own create operations independently.
Also applies to: 62-62
92-92: Fix typo in comment
"ba able" should be "be able"
90-96: Verify object initialization behavior
The new approach of having objects handle their own create operations looks good, but we should verify that all object types properly handle their initialization from create operations.
Let's verify the implementation across different object types:
src/plugins/liveobjects/liveobject.ts (6)
4-4: LGTM: Import changes align with new functionality.
The addition of StateObject to the imports is consistent with the new state object handling capabilities.
36-42: Well-documented property changes that align with optimization goals.
The new properties and documentation effectively support:
- Tracking site-specific timeserials (
_siteTimeserials) - Optimizing initial value merging (
_createOperationIsMerged) - Clear documentation of the aggregated value concept
Line range hint 90-102: LGTM: Optimized update notification.
Good performance optimization to prevent emitting unnecessary update events for noop changes.
133-166: Well-structured abstract interface for state management.
The abstract methods provide a clear contract for implementing classes:
applyOperation: Simplified signature aligns with new state message handlingoverrideWithStateObject: Well-documented method for SYNC sequence handling_mergeInitialDataFromCreateOperation: Supports the optimization goal of merging initial data only once
The documentation clearly explains the rationale behind each method.
44-54: Verify handling of operations before site timeserials initialization.
While initializing _siteTimeserials as empty allows any operation to be applied (as noted in the comment), this could potentially lead to a race condition if operations arrive before proper site timeserials initialization from a SYNC sequence.
103-112: Verify edge cases in timeserial comparison logic.
The _canApplyOperation method is critical for maintaining state consistency. While the logic appears correct, we should verify handling of edge cases:
- Concurrent operations from the same site
- Operations with equal timeserials
✅ Verification successful
Edge cases in timeserial comparison are properly handled
The implementation of _canApplyOperation is correct and handles edge cases appropriately through the underlying Timeserial class implementation:
- Concurrent operations from same site: The
_timeserialComparemethod first compares timestamps, and if equal, uses site codes for deterministic ordering - Operations with equal timeserials: The
after()method strictly requires_timeserialCompare > 0, ensuring that equal timeserials are not applied twice
The implementation ensures consistent state by:
- Only applying operations with strictly greater timeserials (
opOriginTimeserial.after(siteTimeserial)) - Handling the case of first operation from a site (
!siteTimeserial) - Using a robust comparison implementation that considers both timestamp and site code
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for test cases covering timeserial edge cases
rg -A 10 "test.*timeserial.*edge" --type ts
# Look for other timeserial comparison implementations
ast-grep --pattern 'after($_, $_) {
$$$
}'
Length of output: 92
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#!/bin/bash
# Search for timeserial tests and implementation
rg -l "class Timeserial" --type ts
rg -A 10 "describe.*Timeserial" --type ts
rg -A 10 "test.*Timeserial" --type ts
# Look for actual usage of _canApplyOperation
rg "_canApplyOperation" --type ts -A 5
# Find Timeserial class implementation
ast-grep --pattern 'class Timeserial {
$$$
}'
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#!/bin/bash
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rg -p "class Timeserial" --type ts -A 30
rg "after.*\(" --type ts -A 5
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src/plugins/liveobjects/liveobjects.ts (3)
27-27: LGTM: Property type simplification aligns with objectives.
The change from BufferedStateMessage[] to StateMessage[] appropriately simplifies the state handling model, supporting the removal of regional timeserials.
155-157: LGTM: Clear sequencing of sync and buffered operations.
The updated implementation and comments clearly establish the correct order: SYNC data is applied first, followed by buffered state operations. This ensures proper state consistency.
89-99: Verify message ordering preservation.
The simplified buffering logic looks good, but we should verify that message ordering is preserved when buffering and applying state messages, especially during concurrent SYNC operations.
✅ Verification successful
Let me gather more information about the message handling implementation to verify the ordering preservation.
Let me check one more aspect about the message ordering implementation in the LiveObjectsPool.
Based on the gathered evidence, I can now provide the final response:
Message ordering is preserved through the sync mechanism
The implementation correctly handles message ordering through:
- Buffering of state messages during sync using
_bufferedStateOperations - Sequential application of messages after sync completion in
_endSync() - Preservation of timeserials in state messages for conflict resolution
- Proper cleanup of buffer after message application
The removal of msgRegionalTimeserial parameter doesn't impact message ordering as the core ordering mechanism relies on the sync sequence and buffering system, with timeserials still preserved in the state messages themselves.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for message ordering guarantees in tests and related components
# Look for test cases verifying message order
rg -A 5 "test.*message.*order" --glob "**/*.test.{ts,js}"
# Check for ordering-related code in state message handling
rg -A 5 "(order|sequence|serial)" --glob "**/statemessage.{ts,js}"
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rg -A 5 "test.*(concurrent|race|timing)" --glob "**/*.test.{ts,js}"
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ast-grep --pattern 'applyStateMessages($$$) {
$$$
}'
# Look for buffering and sync-related logic
rg -A 10 "_bufferedStateOperations" --type ts
# Check for any message ordering tests specific to LiveObjects
rg -A 10 "test.*LiveObjects.*sync" --glob "**/*.test.{ts,js}"
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rg -A 15 "class LiveObjectsPool" --type ts
# Look for timeserial comparison logic
rg -A 10 "timeserial" --type ts --glob "**/liveobjectspool.ts"
# Check for any ordering-related logic in message application
rg -A 10 "applyStateMessages" --type ts --glob "**/liveobjectspool.ts"
Length of output: 3702
src/plugins/liveobjects/statemessage.ts (4)
107-114: LGTM! Interface changes align with PR objectives.
The addition of siteTimeserials and createOp fields is well-documented and supports the goals of handling site timeserials and isolated create operations.
154-170: Replace this with class name in static methods.
This issue was previously identified in past reviews.
🧰 Tools
🪛 Biome (1.9.4)
[error] 154-154: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 158-158: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 162-162: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 166-166: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 170-170: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
189-300: Well-structured helper methods improve code organization.
The introduction of private static helper methods for encoding and decoding improves code maintainability by:
- Separating concerns into focused methods
- Reducing code duplication
- Making the code more testable
🧰 Tools
🪛 Biome (1.9.4)
[error] 195-195: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 224-224: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 230-230: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 259-259: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
[error] 266-266: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.
(lint/complexity/noThisInStatic)
320-331: LGTM! Improved JSON encoding with proper buffer handling.
The changes to toJSON method:
- Use dedicated helper methods for consistent encoding
- Properly handle platform-specific buffer types
- Maintain compatibility with both JSON.stringify and msgpack
src/plugins/liveobjects/livemap.ts (1)
142-144:
Consider moving site timeserials update after successful operation application
The site timeserials are updated before the operation is actually applied. If the operation application fails (e.g., throws an error), the site timeserial would still be updated, potentially causing subsequent operations to be incorrectly skipped.
Apply this diff to move the update after successful operation application:
- // should update stored site timeserial immediately. doesn't matter if we successfully apply the op,
- // as it's important to mark that the op was processed by the object
- this._siteTimeserials[opOriginTimeserial.siteCode] = opOriginTimeserial;
let update: LiveMapUpdate | LiveObjectUpdateNoop;
switch (op.action) {
case StateOperationAction.MAP_CREATE:
update = this._applyMapCreate(op);
break;
// ... rest of the switch
}
this.notifyUpdated(update);
+ // Update site timeserial after successful operation application
+ this._siteTimeserials[opOriginTimeserial.siteCode] = opOriginTimeserial;test/realtime/live_objects.test.js (5)
33-46: Well-structured helper function implementation!
The forScenarios helper function provides a clean way to handle test scenario execution with support for "only" and "skip" functionality. This improves test organization and maintainability.
Line range hint 504-1002: Comprehensive test coverage for state operations!
The test scenarios thoroughly cover:
- MAP_CREATE operations with primitives and object IDs
- MAP_SET operations with various data types
- MAP_REMOVE operations
- Site timeserials vector validation
- Edge cases and error conditions
The tests are well-structured with clear descriptions and robust assertions.
Line range hint 1003-1577: Excellent test coverage for sync sequences!
The test scenarios effectively validate:
- Operation buffering during STATE_SYNC
- Proper application of buffered operations
- Site timeserials vector handling during sync
- Edge cases for sync sequence interruption
The tests provide robust coverage of complex synchronization scenarios.
Line range hint 1578-2088: Well-structured subscription test coverage!
The test scenarios thoroughly validate:
- LiveCounter and LiveMap subscription callbacks
- Multiple subscription handling
- Unsubscribe functionality (both individual and all)
- Update notification accuracy
The tests provide comprehensive coverage of the subscription lifecycle.
Line range hint 2089-2112: Clean channel attachment test implementation!
The test effectively validates:
- Channel attachment with LiveObjects state modes
- Proper channel options configuration
- Mode validation
Simple and focused test case that covers the essential functionality.
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Refactors LiveMap/LiveCounter object creation and moves most of the creation related busy work inside those classes. Resolves DTP-1076
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (10)
src/plugins/liveobjects/liveobjectspool.ts (1)
Line range hint
69-96: Consider documenting the new state management flow.The simplified state management approach is a significant architectural improvement. Consider adding high-level documentation (e.g., in README.md or API docs) explaining:
- The lifecycle of state operations
- How zero-value objects work
- The relationship between create operations and object initialization
This will help future maintainers understand the design decisions.
src/plugins/liveobjects/liveobject.ts (3)
103-112: Consider adding error handling for invalid timeserialsThe
_canApplyOperationmethod's logic is sound, but it might benefit from additional validation.protected _canApplyOperation(opOriginTimeserial: Timeserial): boolean { + if (!opOriginTimeserial?.siteCode) { + this._client.logger.warn('Invalid timeserial received'); + return false; + } const siteTimeserial = this._siteTimeserials[opOriginTimeserial.siteCode]; return !siteTimeserial || opOriginTimeserial.after(siteTimeserial); }
114-125: Consider memoizing timeserial conversion resultsThe
_timeserialMapFromStringMapmethod performs well but could benefit from memoization for frequently accessed timeserials.+private _timeserialCache: Map<string, Timeserial> = new Map(); + protected _timeserialMapFromStringMap(stringTimeserialsMap: Record<string, string>): Record<string, Timeserial> { const objTimeserialsMap = Object.entries(stringTimeserialsMap).reduce( (acc, v) => { const [key, timeserialString] = v; - acc[key] = DefaultTimeserial.calculateTimeserial(this._client, timeserialString); + if (!this._timeserialCache.has(timeserialString)) { + this._timeserialCache.set( + timeserialString, + DefaultTimeserial.calculateTimeserial(this._client, timeserialString) + ); + } + acc[key] = this._timeserialCache.get(timeserialString)!; return acc; }, {} as Record<string, Timeserial>, ); return objTimeserialsMap; }
127-132: Consider implementing the TODO or creating a tracking issueThe TODO comment about object ID generation implementation should be addressed.
Would you like me to help create a GitHub issue to track this TODO implementation?
src/plugins/liveobjects/liveobjects.ts (1)
197-201: Consider adding detailed error handling for state object conversionWhile the implementation is solid, consider adding more detailed error handling for cases where
overrideWithStateObjectmight fail. This could help with debugging synchronization issues in production.- const update = existingObject.overrideWithStateObject(entry.stateObject); + let update: LiveObjectUpdate; + try { + update = existingObject.overrideWithStateObject(entry.stateObject); + } catch (error) { + this._client.Logger.logAction( + this._client.logger, + this._client.Logger.LOG_ERROR, + 'LiveObjects._applySync()', + `Failed to override state object for ${objectId}: ${error}`, + ); + throw error; + }src/plugins/liveobjects/statemessage.ts (1)
107-114: LGTM! Well-documented interface changes.The replacement of
regionalTimeserialwithsiteTimeserialsand addition ofcreateOpalign well with the PR objectives. The changes improve the handling of operations and initial values.Consider adding a migration guide or deprecation notice if this is a breaking change, as existing consumers might need to update their code to handle the new
siteTimeserialsstructure.test/realtime/live_objects.test.js (4)
33-46: Consider enhancing theforScenarioshelper with error handling and logging.The helper function provides good test filtering functionality but could be improved by:
- Adding error handling for invalid scenario objects
- Including debug logging for skipped/selected scenarios
- Adding TypeScript types for better maintainability
function forScenarios(scenarios, testFn) { + if (!Array.isArray(scenarios)) { + throw new Error('scenarios must be an array'); + } + const onlyScenarios = scenarios.filter((x) => x.only === true); const scenariosToRun = onlyScenarios.length > 0 ? onlyScenarios : scenarios; for (const scenario of scenariosToRun) { if (scenario.skip === true) { + console.debug(`Skipping scenario: ${scenario.description}`); continue; } + console.debug(`Running scenario: ${scenario.description}`); testFn(scenario); } }
638-714: Consider adding edge cases to site timeserials vector tests.While the test coverage for site timeserials is good, consider adding these scenarios:
- Concurrent operations from multiple sites
- Network partition scenarios
- Error cases for invalid timeserials
Line range hint
1377-1486: Consider refactoring complex sync test scenarios for better maintainability.The test scenarios for buffered operations with site timeserials are complex and could benefit from:
- Extracting common setup code into helper functions
- Using a data-driven approach for test cases
- Adding more descriptive comments for the timeserial logic
description: 'buffered state operation messages are applied based on the site timeserials vector of the object', action: async (ctx) => { const { root, liveObjectsHelper, channel } = ctx; + // Helper function to create test state with timeserials + const createTestState = (mapId, counterId) => ({ + mapObject: liveObjectsHelper.mapObject({ + objectId: mapId, + siteTimeserials: { + bbb: 'bbb@2-0', + ccc: 'ccc@5-0', + }, + // ... rest of the state + }), + // ... other objects + }); // start new sync sequence with a cursor const mapId = liveObjectsHelper.fakeMapObjectId(); const counterId = liveObjectsHelper.fakeCounterObjectId(); await liveObjectsHelper.processStateObjectMessageOnChannel({ channel, syncSerial: 'serial:cursor', - state: [ - liveObjectsHelper.mapObject({ - objectId: mapId, - siteTimeserials: { - bbb: 'bbb@2-0', - ccc: 'ccc@5-0', - }, - // ... rest of the state - }), - // ... other objects - ], + state: createTestState(mapId, counterId), }); // ... rest of the test },
Line range hint
1698-1731: Add error handling test cases for subscription callbacks.The subscription tests should include scenarios for:
- Error handling in callbacks
- Memory leak prevention
- Race conditions during unsubscribe
Consider adding these test cases:
{ description: 'handles errors in subscription callbacks gracefully', action: async (ctx) => { const { root, map } = ctx; const errorSpy = sinon.spy(console, 'error'); map.subscribe(() => { throw new Error('Callback error'); }); // Verify error is caught and logged expect(errorSpy.called).to.be.true; errorSpy.restore(); } }, { description: 'prevents memory leaks from subscription callbacks', action: async (ctx) => { // Test cleanup of callback references } }
📜 Review details
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Review profile: CHILL
📒 Files selected for processing (9)
src/plugins/liveobjects/livecounter.ts(5 hunks)src/plugins/liveobjects/livemap.ts(11 hunks)src/plugins/liveobjects/liveobject.ts(4 hunks)src/plugins/liveobjects/liveobjects.ts(6 hunks)src/plugins/liveobjects/liveobjectspool.ts(3 hunks)src/plugins/liveobjects/statemessage.ts(4 hunks)src/plugins/liveobjects/syncliveobjectsdatapool.ts(2 hunks)test/common/modules/live_objects_helper.js(2 hunks)test/realtime/live_objects.test.js(21 hunks)
🚧 Files skipped from review as they are similar to previous changes (3)
- src/plugins/liveobjects/livecounter.ts
- src/plugins/liveobjects/syncliveobjectsdatapool.ts
- test/common/modules/live_objects_helper.js
🔇 Additional comments (19)
src/plugins/liveobjects/liveobjectspool.ts (4)
6-6: LGTM! Import changes align with the simplified state management approach.
The removal of BufferedStateMessage and Timeserial imports reflects the architectural changes described in the PR objectives.
Also applies to: 8-8
90-94: Well-documented architectural improvement.
The new approach of creating zero-value objects upfront and letting objects handle their own create operations is cleaner and more maintainable. The comments effectively explain the rationale behind this design decision.
57-57: Verify zeroValue implementations in LiveMap and LiveCounter.
The changes look good, but let's verify the static factory methods exist and are properly implemented.
Also applies to: 62-62
✅ Verification successful
Static zeroValue methods are properly implemented in both LiveMap and LiveCounter
Both classes have the required static factory methods with correct signatures and implementations:
LiveMap.zeroValue(liveobjects: LiveObjects, objectId: string)creates a new LiveMap with LWW semanticsLiveCounter.zeroValue(liveobjects: LiveObjects, objectId: string)creates a new LiveCounter instance
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify zeroValue static methods exist in LiveMap and LiveCounter
# Check LiveMap implementation
ast-grep --pattern 'class LiveMap {
$$$
static zeroValue($_) {
$$$
}
$$$
}'
# Check LiveCounter implementation
ast-grep --pattern 'class LiveCounter {
$$$
static zeroValue($_) {
$$$
}
$$$
}'
Length of output: 183
Script:
#!/bin/bash
# Let's try a broader search for LiveMap and LiveCounter classes first
echo "=== Searching for LiveMap class ==="
rg "class LiveMap" -A 5
echo "=== Searching for LiveCounter class ==="
rg "class LiveCounter" -A 5
echo "=== Searching for zeroValue method mentions ==="
rg "zeroValue" -A 2
Length of output: 3570
96-96: Verify error handling for invalid object creation.
We should ensure proper error handling exists when operations arrive for objects that shouldn't be created.
✅ Verification successful
Let me gather more information about error handling in the LiveObjectsPool class since that's where the get method is called.
Let me fix the regex and try again to gather the necessary information.
From the results, I can see that the LiveObjectsPool class handles object creation and operations. Let me check one more aspect about error handling in the ObjectId class since it's used for validation.
Error handling for invalid object creation is properly implemented
The codebase has comprehensive error handling for invalid object creation:
- ObjectId validation ensures proper format and type checking with appropriate error messages
- LiveMap and LiveCounter implementations validate operations against object IDs
- LiveObjectsPool creates objects only after validating through ObjectId.fromString
- Non-existent objects are handled via the undefined return type in the get method
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for error handling in applyOperation implementations
# Look for error handling in LiveMap and LiveCounter
rg -A 5 "applyOperation.*\{" src/plugins/liveobjects/live{map,counter}.ts
# Check for validation in object creation
rg -A 5 "zeroValue.*\{" src/plugins/liveobjects/live{map,counter}.ts
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# Check error handling in LiveObjectsPool
rg -A 10 "get\(.*\).*{" src/plugins/liveobjects/liveobjectspool.ts
# Check how objects are created/initialized
rg -A 10 "createObject" src/plugins/liveobjects/liveobjectspool.ts
# Look for any error handling around object creation
rg -A 5 "throw.*Error" src/plugins/liveobjects/liveobjectspool.ts
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# Check error handling in LiveObjectsPool's get method
rg -A 10 "get\s*\(" src/plugins/liveobjects/liveobjectspool.ts
# Check object creation and initialization
ast-grep --pattern 'class LiveObjectsPool {
$$$
get($_) {
$$$
}
$$$
}'
# Look for error handling in LiveObjectsPool
rg -A 5 "throw" src/plugins/liveobjects/liveobjectspool.ts
Length of output: 1476
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#!/bin/bash
# Check ObjectId validation and error handling
rg -A 5 "fromString" src/plugins/liveobjects/objectid.ts
# Look for type validation
rg -A 5 "type.*=.*" src/plugins/liveobjects/objectid.ts
# Check for error handling in object creation
rg -A 5 "throw" src/plugins/liveobjects/objectid.ts
Length of output: 1170
src/plugins/liveobjects/liveobject.ts (4)
4-4: LGTM! Well-documented property additions
The new imports and property declarations are clear and well-documented. The _dataRef documentation effectively explains its role in combining initial and state operations.
Also applies to: 36-42
Line range hint 90-101: LGTM! Improved update notification logic
The noop check optimization prevents unnecessary event emissions, improving performance.
137-166: LGTM! Well-documented abstract method changes
The abstract method changes are well-documented and align perfectly with the PR objectives. The documentation clearly explains the rationale behind merging initial data only once, which should improve performance as intended.
44-54: Verify impact of constructor parameter removal
The constructor changes look good, with proper initialization of new properties. However, since initialData parameter was removed, we should verify this doesn't break existing instantiations.
✅ Verification successful
Let me verify if the LiveObject class is actually meant to be directly instantiated or if it's an abstract base class. This will help determine if the constructor parameter removal has any impact.
Let me try a different approach to check the LiveObject class definition and its usage:
Based on the results, I can now generate the final response:
Constructor changes are safe and well-implemented
The removal of the initialData parameter from the constructor is safe because:
LiveObjectis an abstract class (marked withabstractkeyword)- No direct instantiations of
LiveObjectwere found in the codebase - The constructor is protected, preventing direct instantiation from outside the class hierarchy
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for direct LiveObject instantiations that might be affected
rg -l "new LiveObject.*\(" | while read -r file; do
echo "=== $file ==="
rg "new LiveObject.*\(" "$file" -A 2
done
Length of output: 1430
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#!/bin/bash
# Check if LiveObject is abstract and how it's used
ast-grep --pattern 'class LiveObject'
Length of output: 39
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#!/bin/bash
# Search for LiveObject class definition and check if it's abstract
rg "class LiveObject" -B 2 -A 2
# Also check for any direct instantiations using 'new LiveObject('
rg "new LiveObject\(" -B 2 -A 2
Length of output: 1334
src/plugins/liveobjects/liveobjects.ts (4)
89-99: LGTM! Clean implementation of state message handling
The simplified implementation correctly handles the concurrent nature of state messages during SYNC sequence. The removal of regional timeserial parameter aligns with the PR objectives while maintaining the necessary buffering logic.
155-157: LGTM! Clear ordering of operations
The implementation maintains the correct synchronization order by applying buffered operations after SYNC data, with clear documentation of the process.
Line range hint 198-214: Verify the implementation of new state object methods
The changes introduce new methods:
overrideWithStateObjectfor existing objects- Static
fromStateObjectfactory methods for LiveCounter and LiveMap
These changes align with the PR objectives by consistently using StateObject.
✅ Verification successful
Let me try a different approach to verify these methods.
Implementation of state object methods verified successfully
The code shows proper implementation of both methods across LiveCounter and LiveMap:
-
Both classes implement
static fromStateObjectfactory method that:- Creates a new instance
- Calls
overrideWithStateObjectwith the state object - Returns the initialized instance
-
Both implement
overrideWithStateObjectwith proper validation:- Verifies objectId matches
- Handles state object data appropriately
- Returns corresponding update objects (LiveCounterUpdate/LiveMapUpdate)
The implementation aligns with the PR changes and maintains consistency in state object handling.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Verify the implementation of new methods
echo "Checking LiveCounter implementation:"
ast-grep --pattern 'class LiveCounter {
$$$
static fromStateObject($$$) {
$$$
}
$$$
overrideWithStateObject($$$) {
$$$
}
}'
echo "Checking LiveMap implementation:"
ast-grep --pattern 'class LiveMap {
$$$
static fromStateObject($$$) {
$$$
}
$$$
overrideWithStateObject($$$) {
$$$
}
}'
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Script:
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echo "Searching for LiveCounter implementation:"
rg "class LiveCounter" -A 20
echo "\nSearching for LiveMap implementation:"
rg "class LiveMap" -A 20
echo "\nSearching for overrideWithStateObject implementations:"
rg "overrideWithStateObject" -A 10
Length of output: 8558
27-27: Verify the impact of BufferedStateMessage removal
The change from BufferedStateMessage[] to StateMessage[] simplifies the buffering mechanism by removing the regional timeserial wrapper. This is aligned with the PR objectives.
✅ Verification successful
Based on the search results, I can now generate the final response:
Change from BufferedStateMessage[] to StateMessage[] is safe
The change from BufferedStateMessage[] to StateMessage[] is a safe simplification as there are no references to BufferedStateMessage type in the codebase. The StateMessage class is the core type used throughout the LiveObjects implementation for state synchronization, and the removal of the buffer wrapper aligns with the PR objectives of removing regional timeserial.
Key observations:
StateMessageis properly defined and used consistently across the codebase- No other components depend on
BufferedStateMessagetype - The change simplifies the data structure without breaking functionality
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for any remaining references to BufferedStateMessage to ensure complete removal
rg "BufferedStateMessage" --type ts
Length of output: 35
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#!/bin/bash
# Let's check the git diff to see the changes related to BufferedStateMessage
git diff origin/main -- '*.ts' | grep -A 5 -B 5 "BufferedStateMessage"
# Also search for any type definitions or interfaces that might be related
ast-grep --pattern 'interface $_ {
$$$
}'
# And check for any type definitions
ast-grep --pattern 'type $_ = $$$'
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#!/bin/bash
# Let's check for any state message related types and interfaces
ast-grep --pattern 'type StateMessage = $$$'
# Also search for any state message related code
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Length of output: 23192
src/plugins/liveobjects/statemessage.ts (3)
189-211: LGTM! Well-structured decode helper methods.
The helper methods effectively encapsulate the decoding logic, improving maintainability.
337-348: LGTM! Clean refactoring of toJSON method.
The use of static helper methods improves code organization while maintaining the correct handling of base64 encoding.
154-170: Clarify error handling strategy in TODO comment.
The TODO comment about error handling is vague. Consider documenting:
- Why throwing the first error is the chosen strategy
- What types of errors can occur
- How this affects the partial decoding of the message
Let's check for similar error handling patterns in the codebase:
src/plugins/liveobjects/livemap.ts (4)
132-144: LGTM! Well-structured timeserial handling
The implementation correctly handles operation timeserials and site timeserials updates. The logging is helpful for debugging skipped operations.
72-75:
Remove unsafe non-null assertion
The non-null assertion (!) on stateObject.map?.semantics is unsafe and could lead to runtime errors if map is undefined.
Apply this diff to safely handle undefined map:
- static fromStateObject(liveobjects: LiveObjects, stateObject: StateObject): LiveMap {
- const obj = new LiveMap(liveobjects, stateObject.map?.semantics!, stateObject.objectId);
- obj.overrideWithStateObject(stateObject);
- return obj;
+ static fromStateObject(liveobjects: LiveObjects, stateObject: StateObject): LiveMap {
+ if (!stateObject.map?.semantics) {
+ throw new liveobjects.ErrorInfo(
+ `Invalid state object: map or semantics is undefined for objectId=${stateObject.objectId}`,
+ 50000,
+ 500,
+ );
+ }
+ const obj = new LiveMap(liveobjects, stateObject.map.semantics, stateObject.objectId);
+ obj.overrideWithStateObject(stateObject);
+ return obj;
+ }Likely invalid or redundant comment.
456-484:
Add validation for entry.data
The method accesses entry.data properties without verifying if entry.data is defined. This could cause runtime errors.
Apply this diff to add the necessary validation:
private _liveMapDataFromMapEntries(entries: Record<string, StateMapEntry>): LiveMapData {
const liveMapData: LiveMapData = {
data: new Map<string, MapEntry>(),
};
Object.entries(entries ?? {}).forEach(([key, entry]) => {
+ if (!entry.data) {
+ throw new this._client.ErrorInfo(
+ `Invalid entry data: data is undefined for key=${key} in objectId=${this.getObjectId()}`,
+ 50000,
+ 500,
+ );
+ }
let liveData: StateData;
if (typeof entry.data.objectId !== 'undefined') {
liveData = { objectId: entry.data.objectId } as ObjectIdStateData;
} else {
liveData = { encoding: entry.data.encoding, value: entry.data.value } as ValueStateData;
}
const liveDataEntry: MapEntry = {
...entry,
timeserial: entry.timeserial
? DefaultTimeserial.calculateTimeserial(this._client, entry.timeserial)
: DefaultTimeserial.zeroValueTimeserial(this._client),
tombstone: entry.tombstone === true,
data: liveData,
};
liveMapData.data.set(key, liveDataEntry);
});
return liveMapData;
}Likely invalid or redundant comment.
195-227:
Remove unsafe optional chaining and non-null assertions
The validation logic uses unsafe optional chaining with non-null assertions that could lead to runtime errors.
Apply this diff to safely handle undefined values:
- if (stateObject.map?.semantics !== this._semantics) {
+ if (!stateObject.map) {
+ throw new this._client.ErrorInfo(
+ `Invalid state object: map is undefined for objectId=${stateObject.objectId}`,
+ 50000,
+ 500,
+ );
+ }
+ if (stateObject.map.semantics !== this._semantics) {
throw new this._client.ErrorInfo(
- `Invalid state object: state object map semantics=${stateObject.map?.semantics}; LiveMap semantics=${this._semantics}`,
+ `Invalid state object: state object map semantics=${stateObject.map.semantics}; LiveMap semantics=${this._semantics}`,
50000,
500,
);
}
if (!this._client.Utils.isNil(stateObject.createOp)) {
// ... existing createOp validation ...
- if (stateObject.createOp.map?.semantics !== this._semantics) {
+ if (!stateObject.createOp.map) {
+ throw new this._client.ErrorInfo(
+ `Invalid state object: createOp map is undefined for objectId=${this.getObjectId()}`,
+ 50000,
+ 500,
+ );
+ }
+ if (stateObject.createOp.map.semantics !== this._semantics) {
throw new this._client.ErrorInfo(
- `Invalid state object: state object createOp map semantics=${stateObject.createOp.map?.semantics}; LiveMap semantics=${this._semantics}`,
+ `Invalid state object: state object createOp map semantics=${stateObject.createOp.map.semantics}; LiveMap semantics=${this._semantics}`,
50000,
500,
);
}
}Likely invalid or redundant comment.
VeskeR
deleted the
liveobjects/isolated-create-ops-and-vector-timeserials
branch
Removes usage of
regionalTimeserialand instead usessiteTimeserialsfromStateObjectto decide which operations to apply (site code parsing will be removed from the SDK side once https://ably.atlassian.net/browse/DTP-1078 is completed on realtime).Removed
createdflag from LiveCounter and uses newcreateOpfield onStateObjectto handle the initial value for live objects.The biggest difference from the realtime implementation here is that client SDK merges the initial value from the
createOpfield (once corresponding op is received via a SYNC sequence or as a separate message) into the data stored on the live object only once (and remembers that it was merged, functions similarly to howcreatedworked for Counters), to avoid merging those values every time a live object is read by client (potentially saves a bunch of computation on merging big Map objects).Resolves DTP-1076, DTP-1077
Summary by CodeRabbit
Release Notes
New Features
LiveCounterandLiveMapinstances from state objects, enhancing state management.siteCodeproperty to theTimeserialinterface for improved site-specific tracking.Bug Fixes
Documentation
Refactor
LiveObjectsclass.