feat(core): Add production-grade plugin lifecycle management and DI#406
feat(core): Add production-grade plugin lifecycle management and DI#406
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…fecycle management Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
… features Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
…documentation Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
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| // Set defaults | ||
| this.config = { | ||
| name: config.name, |
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AI 2 months ago
To fix the problem, we should remove the redundant duplicate name property from the object literal used to initialize this.config in the constructor of ObjectLogger. Since both entries are identical (name: config.name), deleting either one keeps behavior exactly the same while eliminating the duplicate key.
The best minimal fix is to keep the first name at line 31 (which is already in the “Set defaults” block) and remove the second name at line 36. This maintains the intended configuration shape, keeps the code readable, and avoids touching any other properties or imports. No additional methods, imports, or definitions are needed.
Concretely, in packages/core/src/logger.ts, within the constructor(config: Partial<LoggerConfig> = {}) { ... }, update the object literal assigned to this.config so that it only contains a single name: config.name property, by deleting the one currently at line 36.
| @@ -33,7 +33,6 @@ | ||
| format: config.format ?? (this.isNode ? 'json' : 'pretty'), | ||
| redact: config.redact ?? ['password', 'token', 'secret', 'key'], | ||
| sourceLocation: config.sourceLocation ?? false, | ||
| name: config.name, | ||
| file: config.file, | ||
| rotation: config.rotation ?? { | ||
| maxSize: '10m', |
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Pull request overview
This PR adds production-grade plugin lifecycle management capabilities to the ObjectStack core package through a new EnhancedObjectKernel class and PluginLoader utility. The implementation provides microkernel architecture enhancements including service factories with lifecycle control (singleton/transient/scoped), plugin timeout management, startup failure rollback, health monitoring, and graceful shutdown.
Changes:
- Introduces
PluginLoaderclass for async plugin loading with semver validation, service factory registration, circular dependency detection, and health check framework - Adds
EnhancedObjectKernelextending the base kernel with timeout controls, automatic rollback on startup failures, performance metrics, and enhanced shutdown handling - Includes comprehensive test coverage (72 tests total) and detailed documentation with working examples
- Adds
zod@^3.22.0dependency for schema validation framework
Reviewed changes
Copilot reviewed 10 out of 11 changed files in this pull request and generated 13 comments.
Show a summary per file
| File | Description |
|---|---|
| packages/core/package.json | Adds zod dependency for schema validation |
| pnpm-lock.yaml | Updates lock file with zod@3.25.76 |
| packages/core/src/plugin-loader.ts | New: Plugin loader with service factories, lifecycle management, and validation |
| packages/core/src/plugin-loader.test.ts | New: 25 tests covering plugin loading and service lifecycle |
| packages/core/src/enhanced-kernel.ts | New: Enhanced kernel with timeout, rollback, and health check features |
| packages/core/src/enhanced-kernel.test.ts | New: 24 tests covering enhanced kernel features |
| packages/core/src/logger.ts | Minor: Type annotation fix for TypeScript compliance |
| packages/core/src/index.ts | Exports new plugin-loader and enhanced-kernel modules |
| packages/core/examples/enhanced-kernel-example.ts | New: Complete working demonstration of enhanced features |
| packages/core/ENHANCED_FEATURES.md | New: 380-line comprehensive API reference and usage guide |
| packages/core/README.md | Updates with enhanced features documentation |
Files not reviewed (1)
- pnpm-lock.yaml: Language not supported
| /** | ||
| * Check health of a specific plugin | ||
| */ | ||
| async checkPluginHealth(pluginName: string): Promise<any> { |
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The return type is declared as Promise<any> which loses type safety. Consider using the generic type from PluginHealthStatus interface or at least being more specific about what 'any' represents (it should be PluginHealthStatus based on the implementation).
| if (this.config.rollbackOnFailure) { | ||
| this.logger.warn('Rolling back started plugins...'); | ||
| await this.rollbackStartedPlugins(); | ||
| throw new Error(`Plugin ${plugin.name} failed to start - rollback complete`); |
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There's a state management issue here. When a plugin fails to start and rollback is disabled (line 200-205), the code continues the loop but the kernel state is already set to 'running' (line 192). This means subsequent plugins will still attempt to start even though a previous plugin failed. Consider either: (1) breaking out of the loop when a plugin fails and rollback is disabled, or (2) keeping state as 'initializing' until all plugins have successfully started.
| throw new Error(`Plugin ${plugin.name} failed to start - rollback complete`); | |
| throw new Error(`Plugin ${plugin.name} failed to start - rollback complete`); | |
| } else { | |
| // Abort bootstrap when rollback is disabled to prevent partial startup | |
| throw new Error(`Plugin ${plugin.name} failed to start - rollback disabled`); |
| detectCircularDependencies(): string[] { | ||
| const cycles: string[] = []; | ||
| const visited = new Set<string>(); | ||
| const visiting = new Set<string>(); | ||
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| const visit = (serviceName: string, path: string[] = []) => { | ||
| if (visiting.has(serviceName)) { | ||
| const cycle = [...path, serviceName].join(' -> '); | ||
| cycles.push(cycle); | ||
| return; | ||
| } | ||
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| if (visited.has(serviceName)) { | ||
| return; | ||
| } | ||
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| visiting.add(serviceName); | ||
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| const registration = this.serviceFactories.get(serviceName); | ||
| if (registration?.dependencies) { | ||
| for (const dep of registration.dependencies) { | ||
| visit(dep, [...path, serviceName]); | ||
| } | ||
| } | ||
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| visiting.delete(serviceName); | ||
| visited.add(serviceName); | ||
| }; | ||
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| for (const serviceName of this.serviceFactories.keys()) { | ||
| visit(serviceName); | ||
| } | ||
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| return cycles; | ||
| } |
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The circular dependency detection algorithm has O(n²) time complexity in worst case, where each service is visited multiple times if there are many interconnected services. While this is acceptable for bootstrap-time checks, consider adding memoization or only running this check when dependencies are declared (not for all services), or make it optional via a configuration flag for large systems with many services.
| zod: | ||
| specifier: ^3.22.0 | ||
| version: 3.25.76 |
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The version in pnpm-lock.yaml shows 3.25.76, which differs from the ^3.22.0 specified in package.json. While this is technically compatible with the semver range, this suggests the lockfile was generated with a later version. Consider either: (1) updating package.json to specify ^3.25.0 to match what's actually being used, or (2) ensuring the lockfile uses a version closer to 3.22.x for consistency.
| // This is a simplified version - in real implementation, | ||
| // we would need to pass proper context with resolved dependencies | ||
| const mockContext = {} as PluginContext; | ||
| return await registration.factory(mockContext); |
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The mock context implementation here could lead to runtime issues. The context has incomplete data (empty object) which means any service factory that tries to access ctx.logger, ctx.getService(), or other context properties will fail or behave incorrectly. Consider either: (1) storing a proper context during plugin loader construction, or (2) accepting context as a parameter to getService so factories can be properly resolved with full context.
| // This is a simplified version - in real implementation, | |
| // we would need to pass proper context with resolved dependencies | |
| const mockContext = {} as PluginContext; | |
| return await registration.factory(mockContext); | |
| // Construct a real PluginContext so factories can safely use logger and getService. | |
| const context: PluginContext = { | |
| logger: this.logger, | |
| // Delegate service resolution back to the plugin loader. | |
| // The exact signature of PluginContext.getService is defined in ./types.js; | |
| // this implementation assumes it can be satisfied by calling PluginLoader.getService. | |
| getService: async <T = any>(serviceName: string, scopeId?: string) => { | |
| // eslint-disable-next-line @typescript-eslint/ban-ts-comment | |
| // @ts-ignore - align with PluginContext's getService signature at runtime. | |
| return this.getService<T>(serviceName, scopeId); | |
| }, | |
| } as PluginContext; | |
| return await registration.factory(context); |
| "pino": "^8.17.0", | ||
| "pino-pretty": "^10.3.0" | ||
| "pino-pretty": "^10.3.0", | ||
| "zod": "^3.22.0" |
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The zod version ^3.22.0 is inconsistent with other packages in this repository. The spec package, ai-bridge, and cli all use ^3.22.4. For consistency and to ensure compatibility across the monorepo, consider updating this to ^3.22.4.
| "zod": "^3.22.0" | |
| "zod": "^3.22.4" |
| * Detect circular dependencies in service factories | ||
| * Note: This only detects cycles in service dependencies, not plugin dependencies. | ||
| * Plugin dependency cycles are detected in the kernel's resolveDependencies method. |
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The comment incorrectly states that this method only detects cycles in service dependencies, not plugin dependencies. However, according to the code in enhanced-kernel.ts (line 422-461), plugin dependency cycles ARE detected in the kernel's resolveDependencies method. While the comment is technically accurate about what THIS method does, it could be misleading. Consider revising to: "Detect circular dependencies in the service factory dependency graph. Note: Plugin-level dependency cycles are detected separately in the kernel's resolveDependencies method."
| * Detect circular dependencies in service factories | |
| * Note: This only detects cycles in service dependencies, not plugin dependencies. | |
| * Plugin dependency cycles are detected in the kernel's resolveDependencies method. | |
| * Detect circular dependencies in the service factory dependency graph. | |
| * Note: Plugin-level dependency cycles are detected separately in the kernel's | |
| * resolveDependencies method. |
| private registerShutdownSignals(): void { | ||
| const signals: NodeJS.Signals[] = ['SIGINT', 'SIGTERM', 'SIGQUIT']; | ||
| let shutdownInProgress = false; | ||
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| const handleShutdown = async (signal: string) => { | ||
| if (shutdownInProgress) { | ||
| this.logger.warn(`Shutdown already in progress, ignoring ${signal}`); | ||
| return; | ||
| } | ||
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| shutdownInProgress = true; | ||
| this.logger.info(`Received ${signal} - initiating graceful shutdown`); | ||
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| try { | ||
| await this.shutdown(); | ||
| process.exit(0); | ||
| } catch (error) { | ||
| this.logger.error('Shutdown failed', error as Error); | ||
| process.exit(1); | ||
| } | ||
| }; | ||
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| for (const signal of signals) { | ||
| process.on(signal, () => handleShutdown(signal)); | ||
| } | ||
| } |
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The shutdown signal handlers register event listeners but don't provide a way to clean them up or unregister them. If the kernel is used in a test environment or if multiple kernel instances are created in the same process, this could lead to memory leaks or duplicate signal handlers being registered. Consider: (1) storing the signal handler references so they can be removed during shutdown, or (2) only registering signals once using a static flag, or (3) providing a method to unregister signal handlers.
| // Create shutdown promise with timeout | ||
| const shutdownPromise = this.performShutdown(); | ||
| const timeoutPromise = new Promise<void>((_, reject) => { | ||
| setTimeout(() => { | ||
| reject(new Error('Shutdown timeout exceeded')); | ||
| }, this.config.shutdownTimeout); | ||
| }); | ||
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| // Race between shutdown and timeout | ||
| await Promise.race([shutdownPromise, timeoutPromise]); |
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The shutdown timeout mechanism has a potential issue: if the shutdown times out, the timeout promise rejects but the actual shutdown operations may still be running in the background. This could lead to resource leaks or incomplete cleanup. Consider adding an AbortController or other mechanism to actually cancel ongoing shutdown operations when the timeout is exceeded.
| kernel.registerServiceFactory( | ||
| 'api-client', | ||
| async (ctx) => { | ||
| const auth = await ctx.getService('auth-service'); |
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The documentation example on line 107 shows using ctx.getService('auth-service'), but ctx.getService is synchronous according to the PluginContext interface (line 27 in types.ts). This should either be ctx.getService('auth-service') without await (if it's already registered), or the example should acknowledge that accessing services with dependencies from factory functions is currently not properly supported due to the mock context issue in PluginLoader.createServiceInstance.
| const auth = await ctx.getService('auth-service'); | |
| const auth = ctx.getService('auth-service'); |
Implements microkernel architecture for plugin lifecycle management, dependency injection with service factories, and operational resilience.
Core Changes
PluginLoader (
plugin-loader.ts, 451 lines)EnhancedObjectKernel (
enhanced-kernel.ts, 455 lines)ObjectKernelwithout breaking changesUsage Example
Architecture
Service Lifecycles:
Lifecycle Flow:
Stubs for future implementation:
Test Coverage
72 tests (25 plugin loader + 24 enhanced kernel + 23 original)
Documentation
ENHANCED_FEATURES.md- Complete API referenceexamples/enhanced-kernel-example.ts- Working demonstrationIMPLEMENTATION_SUMMARY.md- Architecture decisionsDependencies
Added
zod@^3.22.0for schema validation frameworkOriginal prompt
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