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chore(satp-hermes): crash recovery architecture
Signed-off-by: Rafael Belchior <rafael.belchior@tecnico.ulisboa.pt>
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2 changes: 2 additions & 0 deletions
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...ages/cactus-plugin-satp-hermes/src/main/typescript/blo/recover/recover-handler-service.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| // handler to allow a user application to communicate a gateway it crashed and needs to be recovered. It "forces" and update of status with a counterparty gateway | ||
| // TODO update the spec with a RecoverForce message that is handled by this handler |
2 changes: 2 additions & 0 deletions
2
...ges/cactus-plugin-satp-hermes/src/main/typescript/blo/recover/rollback-handler-service.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| // handler to allow a user application to force a rollback | ||
| // TODO update the spec with RollbackForce message that is handled by this handler |
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packages/cactus-plugin-satp-hermes/src/main/typescript/core/recovery/crash-manager.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| import { | ||
| Logger, | ||
| LoggerProvider, | ||
| Checks, | ||
| LogLevelDesc, | ||
| } from "@hyperledger/cactus-common"; | ||
| import { SessionData } from "../../generated/proto/cacti/satp/v02/common/session_pb"; | ||
| import { CrashRecoveryHandler } from "./crash-recovery-handler"; | ||
| import { SATPSession } from "../satp-session"; | ||
| import { | ||
| RollbackState, | ||
| RollbackStrategy, | ||
| RollbackStrategyFactory, | ||
| } from "./rollback/rollback-strategy-factory"; | ||
|
|
||
| enum CrashStatus { | ||
| IN_RECOVERY = "IN_RECOVERY", | ||
| RECOVERED = "RECOVERED", | ||
| NO_CRASH = "NO_CRASH", | ||
| } | ||
|
|
||
| class CrashOccurrence { | ||
| constructor( | ||
| public status: CrashStatus, | ||
| public time: Date, | ||
| public lastUpdate: Date, | ||
| ) {} | ||
| } | ||
|
|
||
| export interface ICrashRecoveryManagerOptions { | ||
| logLevel?: LogLevelDesc; | ||
| instanceId: string; | ||
| } | ||
|
|
||
| export class CrashRecoveryManager { | ||
| public static readonly CLASS_NAME = "CrashRecoveryManager"; | ||
| private readonly log: Logger; | ||
| private readonly instanceId: string; | ||
| private readonly sessions: Map<string, SessionData>; | ||
| private crashRecoveryHandler: CrashRecoveryHandler; | ||
| private factory: RollbackStrategyFactory; | ||
|
|
||
| constructor(public readonly options: ICrashRecoveryManagerOptions) { | ||
| const fnTag = `${CrashRecoveryManager.CLASS_NAME}#constructor()`; | ||
| Checks.truthy(options, `${fnTag} arg options`); | ||
|
|
||
| const level = this.options.logLevel || "DEBUG"; | ||
| const label = this.className; | ||
| this.log = LoggerProvider.getOrCreate({ level, label }); | ||
| this.instanceId = options.instanceId; | ||
| this.sessions = this.getSessions() || new Map<string, SessionData>(); | ||
| this.log.info(`Instantiated ${this.className} OK`); | ||
| this.factory = new RollbackStrategyFactory(); | ||
| } | ||
|
|
||
| get className(): string { | ||
| return CrashRecoveryManager.CLASS_NAME; | ||
| } | ||
|
|
||
| private getSessions(): Map<string, SessionData> { | ||
| // todo read from local log to get session data | ||
| return new Map<string, SessionData>(); | ||
| } | ||
|
|
||
| // todo create util functoin that retrieves sessionid and checks if it is valid; i believe it is implemented in the satp services, refactor making it reusable | ||
| private checkCrash(sessionId: SATPSession): Promise<boolean> { | ||
| // todo implement crash check - check logs and understsands if there was a crash; might use timouts, etc | ||
| return Promise.resolve(false); | ||
| } | ||
|
|
||
| public async setupCrashManager() { | ||
| // todo setup handler, need to create services | ||
| this.crashRecoveryHandler = new CrashRecoveryHandler({ | ||
| loggerOptions: { | ||
| label: "CrashRecoveryHandler", | ||
| level: "DEBUG", | ||
| }, | ||
| serverService: null, | ||
| clientService: null, | ||
| sessions: this.sessions, | ||
| }); | ||
| } | ||
|
|
||
| public async checkAndResolveCrash(sessionId: SATPSession): Promise<boolean> { | ||
| const fnTag = `${this.className}#checkAndResolveCrash()`; | ||
| this.log.info(`${fnTag} Checking crash status for session ${sessionId}`); | ||
|
|
||
| try { | ||
| const didCrash = await this.checkCrash(sessionId); | ||
| if (didCrash) { | ||
| // create new occurrence | ||
| const crashOccurrence = new CrashOccurrence( | ||
| CrashStatus.IN_RECOVERY, | ||
| new Date(), | ||
| new Date(), | ||
| ); | ||
| this.log.debug(crashOccurrence); | ||
| // todo manage occurrence | ||
| // call corresponding services via handler for crash recovery | ||
| return false; | ||
| } else { | ||
| this.log.error( | ||
| `${fnTag} Failed to resolve crash for session ${sessionId}`, | ||
| ); | ||
| // should panic and stop the server, for manual inspection | ||
| return false; | ||
| } | ||
| } catch (error) { | ||
| this.log.error( | ||
| `${fnTag} Error during crash check and resolution: ${error}`, | ||
| ); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| public async initiateRollback( | ||
| session: SATPSession, | ||
| forceRollback?: boolean, | ||
| ): Promise<boolean> { | ||
| const fnTag = `CrashRecoveryManager#initiateRollback()`; | ||
| this.log.info( | ||
| `${fnTag} Initiating rollback for session ${session.getSessionId()}`, | ||
| ); | ||
|
|
||
| try { | ||
| // Implement check for rollback (needs to read logs, etc) OR we assume that at satp handler/service layer this check is done and rollback is good to do | ||
| const shouldRollback = true; // todo implement check | ||
|
|
||
| if (forceRollback || shouldRollback) { | ||
| // send bridge manager and possibly others to factory | ||
| const strategy = this.factory.createStrategy(session); | ||
| const rollbackState = await this.executeRollback(strategy, session); | ||
|
|
||
| if (rollbackState) { | ||
| const cleanupSuccess = await this.performCleanup( | ||
| strategy, | ||
| session, | ||
| rollbackState, | ||
| ); | ||
| return cleanupSuccess; | ||
| } else { | ||
| this.log.error( | ||
| `${fnTag} Rollback execution failed for session ${session.getSessionId()}`, | ||
| ); | ||
| return false; | ||
| } | ||
| } else { | ||
| this.log.info( | ||
| `${fnTag} Rollback not needed for session ${session.getSessionId()}`, | ||
| ); | ||
| return true; | ||
| } | ||
| } catch (error) { | ||
| this.log.error(`${fnTag} Error during rollback initiation: ${error}`); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| private async executeRollback( | ||
| strategy: RollbackStrategy, | ||
| session: SATPSession, | ||
| ): Promise<RollbackState | undefined> { | ||
| const fnTag = `CrashRecoveryManager#executeRollback`; | ||
| this.log.debug( | ||
| `${fnTag} Executing rollback strategy for session ${session.getSessionId()}`, | ||
| ); | ||
|
|
||
| try { | ||
| return await strategy.execute(session); | ||
| } catch (error) { | ||
| this.log.error(`${fnTag} Error executing rollback strategy: ${error}`); | ||
| } | ||
| } | ||
|
|
||
| private async performCleanup( | ||
| strategy: RollbackStrategy, | ||
| session: SATPSession, | ||
| state: RollbackState, | ||
| ): Promise<boolean> { | ||
| const fnTag = `CrashRecoveryManager#performCleanup`; | ||
| this.log.debug( | ||
| `${fnTag} Performing cleanup after rollback for session ${session.getSessionId()}`, | ||
| ); | ||
|
|
||
| try { | ||
| const updatedState = await strategy.cleanup(session, state); | ||
|
|
||
| // TODO: Handle the updated state, perhaps update session data or perform additional actions | ||
| this.log.info( | ||
| `${fnTag} Cleanup completed. Updated state: ${JSON.stringify(updatedState)}`, | ||
| ); | ||
|
|
||
| return true; | ||
| } catch (error) { | ||
| this.log.error(`${fnTag} Error during cleanup: ${error}`); | ||
| return false; | ||
| } | ||
| } | ||
| } |
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