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chainHead: Add support for storage pagination and cancellation #14755

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merged 19 commits into from
Aug 24, 2023
Merged

chainHead: Add support for storage pagination and cancellation #14755

merged 19 commits into from
Aug 24, 2023

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lexnv
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@lexnv lexnv commented Aug 11, 2023

This PR adds configurable pagination for the storage query types: DescendantHashes and DescendantValues with the possibility to cancel the operation after the WaitingForContinue event is generated.

  • implement chainHead_unstable_continue method
  • implement chainHead_unstable_stopOperation method
  • add configurable pagination limit after which the WaitingForContinue event is generated
  • iterable storage queries are placed in a queue for providing fairness across multiple queries of the same operation
  • limiter object from chainHead: Limit ongoing operations #14699 is refactored inside an Operations object for better ergonomics
  • registering an operation shares a lock-free state between the backend and frontend for efficient signaling of continue or stop
    • RegisteredOperation object is returned to the backend (chainHead event generation) via the BlockGuard
    • OperationState object is returned to the frontend and has direct user access via chainHead_unstable_continue and chainHead_unstable_stopOperation
  • RegisteredOperation in RAII manner (on drop) releases the capacity permit for the operation and unregisters the operation from the subscription state
  • integration-tests for the continue and stop operations (via check_continue_operation and stop_storage_operation)

Builds on top of: #14699
Closes: #14549
Closes: #14639

// @paritytech/subxt-team

@lexnv lexnv added A0-please_review Pull request needs code review. C1-low PR touches the given topic and has a low impact on builders. D3-trivial 🧸 PR contains trivial changes in a runtime directory that do not require an audit B1-note_worthy Changes should be noted in the release notes T2-API This PR/Issue is related to APIs. labels Aug 11, 2023
@lexnv lexnv requested review from jsdw and skunert August 11, 2023 11:33
@lexnv lexnv self-assigned this Aug 11, 2023
@lexnv lexnv changed the title chainHead: Add support storage pagination and cancellation chainHead: Add support for storage pagination and cancellation Aug 11, 2023
Base automatically changed from lexnv/chainhead_limits to master August 15, 2023 12:17
@lexnv
chainHead/api: Add chain_head_unstable_continue method
a97fd42 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/subscriptions: Register operations for pagination
fe3404c 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/subscriptions: Merge limits with registered operation
72b26c3 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/subscriptions: Expose the operation state
e28d982 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chain_head/storage: Generate WaitingForContinue event
1d717df 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead: Use the continue operation
3bbc9ba 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/tests: Adjust testing to the new storage interface
5afe9c0 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/config: Make pagination limit configurable
c8e8ed5 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/tests: Adjust chainHeadConfig
60492c7 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/tests: Check pagination and continue method
6929ec5 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/api: Add chainHead_unstable_stopOperation method
2791c90 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/subscription: Add shared atomic state for efficient alloc
8bda477 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead: Implement operation stop
382ce98 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/tests: Check that storage ops can be cancelled
3a5c12a 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/storage: Change docs for query_storage_iter_pagination
6d825a6 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/subscriptions: Fix merge conflicts
cab6202 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
niklasad1
niklasad1 reviewed Aug 22, 2023
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client/rpc-spec-v2/Cargo.toml Outdated
@@ -36,6 +36,7 @@ tokio = { version = "1.22.0", features = ["sync"] }
array-bytes = "6.1"
log = "0.4.17"
futures-util = { version = "0.3.19", default-features = false }
async-channel = "1.8.0"
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@niklasad1 niklasad1 Aug 22, 2023 •
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Can you explain why async-channel is used here?

You already got the futures-channel and tokio sync in the dependency tree so I don't follow why this dependency is introduced as the both tokio and futures-channel provides an API for the stuff you implemented on top of the channel

EDIT: tokio::sync::mpsc creates a buffer with 1 and futures_channel a buffer with 1 + num senders, so I guess you want exactly one here

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That makes sense! I can't actually remember if I picked the async-channel here since it doesn't require the receiver part to be mutable 🤔

I'll change a bit the API since it's worth not adding extra dependencies, thanks!

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ah, didn't notice that :D

niklasad1
niklasad1 reviewed Aug 23, 2023
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client/rpc-spec-v2/src/chain_head/subscription/inner.rs
.requested_continue
.store(true, std::sync::atomic::Ordering::Release);

let _ = self.recv_continue.recv().await;
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what if the channel is closed i.e, returns TrySendError::Closed or can't that happen?

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The sender part of the channel should be around until this RegisteredOperation is dropped, since it object is the only one that can remove the operation from tracking (the operations: Arc<Mutex<HashMap<String, OperationState>>> field), will add a comment :D

@lexnv
chainHead: Replace async-channel with tokio::sync
141ca3f 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv
chainHead/subscription: Add comment about the sender/recv continue
7ccef40 
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
@lexnv lexnv mentioned this pull request Aug 23, 2023
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skunert
skunert approved these changes Aug 23, 2023
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Looks nice!

niklasad1
niklasad1 approved these changes Aug 24, 2023
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👍

@lexnv lexnv merged commit 92633bb into master Aug 24, 2023
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@lexnv lexnv deleted the lexnv/chainhead_pag branch August 24, 2023 11:32
@crystalin crystalin mentioned this pull request Oct 20, 2023
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@JesseAbram JesseAbram mentioned this pull request Oct 26, 2023
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@niklasad1 niklasad1 niklasad1 approved these changes

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@jsdw jsdw Awaiting requested review from jsdw

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A0-please_review Pull request needs code review. B1-note_worthy Changes should be noted in the release notes C1-low PR touches the given topic and has a low impact on builders. D3-trivial 🧸 PR contains trivial changes in a runtime directory that do not require an audit T2-API This PR/Issue is related to APIs.
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[RPC-Spec-V2] Cancel ongoing operations [RPC-Spec-V2] Storage: Add support for pagination
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