fix race conditions #31
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WalkthroughThe changes update the CI workflow to run Go tests with the Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant SSEServer
participant SSESession
Note over SSESession: eventQueue (buffered: 100)
Client->>SSEServer: Request to send event
SSEServer->>SSESession: Marshal event to JSON
SSESession->>SSESession: Enqueue event into eventQueue
loop Event Loop
SSESession->>Client: Dequeue and send event
end
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Actionable comments posted: 0
🧹 Nitpick comments (5)
server/sse.go (5)
26-29: Introduce a configurable event queue buffer size
DeclaringeventQueue chan stringand adding a buffer of fixed size (100) is a good start. However, consider introducing a configurable capacity to adapt to different workloads or system constraints.
116-119: Use a configurable buffer size when initializing the event queue
Similar to the struct definition, a fixed buffer size of 100 may not be ideal in all scenarios. Consider passing a configuration parameter or environment variable to let users tune the queue length based on their needs.
132-139: Evaluate error handling for JSON marshalling
Within theif err == nilblock, it silently ignores the case whereerris non-nil. Logging or returning the marshalling error can greatly aid in debugging.
155-171: Consider adding a heartbeat or timeout in the main event loop
The infinite loop successfully processes queued events but might hold resources indefinitely if the client is unresponsive. A heartbeat, ping/keep-alive, or automatic session timeout can mitigate potential goroutine leaks.
214-223: Log or handle full queue scenario to aid debugging
When thedefaultcase is hit, the queue is full, and the event is silently skipped. Consider at least logging a warning to help with diagnosing potential data loss.
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📒 Files selected for processing (3)
.github/workflows/ci.yml(1 hunks)server/server.go(21 hunks)server/sse.go(6 hunks)
🔇 Additional comments (25)
.github/workflows/ci.yml (1)
15-15: Good addition of the Go race detector
Enabling the-raceflag helps detect race conditions early, which is crucial given the recent concurrency-related changes.server/sse.go (1)
265-272: Gracefully rejecting events on a full queue
Returning an error when the queue is full provides clear feedback to callers. This is a good approach for backpressure.server/server.go (23)
9-11: New imports for concurrency
Importingsyncandsync/atomicis appropriate for managing thread-safe operations and an atomic flag.
67-67: Use of RWMutex for shared resources
Addingmu sync.RWMutexis a solid approach for read-heavy access patterns, preventing unnecessary contention.
78-80: Introducing a dedicated mutex and atomic Bool
SeparatingclientMufrom the main mutex and using anatomic.Boolfor theinitializedflag can reduce contention and potential data races.
99-101: Proper lock usage for setting current client
Locking arounds.currentClientensures correct updates to the client context in concurrent scenarios.
114-117: Copying client context under lock
Taking a snapshot ofs.currentClientwhile holding the mutex ensures thread safety for subsequent operations.
408-409: Lock usage for AddResource
Wrapping resource addition withs.mu.Lock()/defer s.mu.Unlock()properly synchronizes writes to shared maps.
424-425: Lock usage for AddResourceTemplate
Similarly protects updates to theresourceTemplatesmap, preventing concurrent write conflicts.
438-439: Lock usage for AddPrompt
Safely registers new prompts and handlers while preventing data races.
450-455: Reading the 'initialized' flag within a lock
This pattern ensures the state is read consistently with other shared data. Releasing the lock immediately after is efficient.
458-458: Sending notification after reading 'initialized'
This conditional approach is correct: notify only if the server is fully initialized, preventing spurious notifications.
467-469: Replacing tools under lock
Correctly synchronizes the map reset and avoids race conditions when reinitializing tools.
475-480: Safe read of 'initialized' before deleting tools
Ensuring consistency when reading the flag again under lock is necessary for correct state checks.
483-483: Conditional notification post-deletion
Properly checks the server state to avoid unexpected notifications for uninitialized servers.
495-496: Lock usage for AddNotificationHandler
Registering a new handler under lock ensures consistency across concurrent additions.
540-540: Using atomic.Store for initialization
Callings.initialized.Store(true)explicitly signals readiness without risking lost updates.
557-562: RLock usage in handleListResources
Read-locking protects theresourcesmap while enumerating. This is a good pattern for concurrent reads.
578-583: RLock usage in handleListResourceTemplates
ProtectsresourceTemplatesduring read-operations, consistent with other resource methods.
599-632: Partial unlock pattern in handleReadResource
Conditionally releasing the read lock for execution is a valid strategy to avoid blocking other readers while processing.
663-668: RLock usage in handleListPrompts
Keeps prompt reads thread-safe. This mirrors the strategy used in the resource methods.
684-686: RLock usage to retrieve prompt handler
SynchronizingpromptHandlerslookups ensures safe concurrent reads.
709-725: RLock usage and sorting tool names
Protecting thetoolsmap and sorting the tool list under lock ensures consistent, race-free results.
741-744: Thread-safe lookup of tool by name
Locks the map before checking for existence, preventing race conditions on concurrent tool access.
765-767: RLock usage for notificationHandlers
This ensures safe concurrent reads when handling incoming notifications.
Summary by CodeRabbit
Tests
Bug Fixes