DevMode: automatic reconnect if losing connection to echo server#308
DevMode: automatic reconnect if losing connection to echo server#308
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Actionable comments posted: 2
🧹 Nitpick comments (1)
internal/dev/server.go (1)
66-69: Consider lighter‐weight concurrency primitives for counters
reconnectFailuresis anintprotected by async.Mutex.
Given that the only operations are simple increments, reads and resets, using anint32/uint32together withatomic.AddInt32/atomic.LoadInt32would:
- remove the need for an extra mutex field,
- avoid potential lock-contention when several failing goroutines run in parallel,
- make the fast-path (successful connection) lock-free.
Not mandatory, but worth considering if high-frequency reconnects are expected.
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internal/dev/server.go(3 hunks)
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internal/dev/server.go (2)
internal/project/project.go (1)
ProjectContext(455-464)internal/util/api.go (1)
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🪛 golangci-lint (1.64.8)
internal/dev/server.go
62-62: field srv is unused
(unused)
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🔇 Additional comments (1)
internal/dev/server.go (1)
219-228: Nice touch resetting the failure windowGood to see the failure counter and timestamps cleared once a connection succeeds; this prevents
stale state from triggering the fatal-limit later on.
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Actionable comments posted: 1
♻️ Duplicate comments (1)
internal/dev/server.go (1)
158-186:⚠️ Potential issueThe reconnection logic may lead to unbounded goroutine creation.
While the reconnection mechanism with exponential backoff is well implemented, the approach of spawning a new goroutine for each reconnection attempt (line 185) could lead to resource exhaustion during extended outages, as noted in a previous review.
To ensure only one reconnect loop is active at a time, consider implementing a semaphore or atomic flag:
type Server struct { // existing fields... reconnectFailures int connectionFailed time.Time connectionStarted time.Time reconnectMutex sync.Mutex + reconnecting int32 // atomic flag } func (s *Server) reconnect() { + // Only one goroutine should be attempting reconnection + if !atomic.CompareAndSwapInt32(&s.reconnecting, 0, 1) { + return + } if s.conn != nil { s.conn.Close() s.conn = nil } go func() { s.connect(false) + atomic.StoreInt32(&s.reconnecting, 0) }() }
🧹 Nitpick comments (1)
internal/dev/server.go (1)
62-62: Unused fieldsrvin Server struct.The
srvfield is declared but never used in the code.Consider removing this unused field:
type Server struct { // other fields... - srv *http2.Server // remaining fields... }🧰 Tools
🪛 golangci-lint (1.64.8)
62-62: field
srvis unused(unused)
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internal/dev/server.go(3 hunks)
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internal/dev/server.go (2)
internal/project/project.go (1)
ProjectContext(455-464)internal/util/api.go (1)
APIClient(35-41)
🪛 golangci-lint (1.64.8)
internal/dev/server.go
62-62: field srv is unused
(unused)
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🔇 Additional comments (6)
internal/dev/server.go (6)
32-34: Good addition of a reconnection limit to avoid infinite retries.The
maxConnectionFailuresconstant ensures connections won't retry forever, which prevents resource exhaustion if the server remains unreachable.
66-69: Solid foundation for connection tracking and synchronization.The new fields provide essential state tracking for implementing a reliable reconnection mechanism with appropriate synchronization.
169-177: Synchronized capture of reconnection state.Good use of mutex protection and local variables to prevent race conditions when tracking connection failures.
182-182: Good use of local variablecountto calculate backoff delay.This addresses the potential data race identified in previous reviews by using the locally captured value instead of directly accessing
s.reconnectFailures.
219-228: Good reset of connection state on successful reconnection.Properly resetting the failure counters and timestamps when connection succeeds prevents the accumulation of failed attempts across disconnections.
229-229: Helpful log message on successful connection.This debug message provides useful observability for connection status.
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Actionable comments posted: 0
♻️ Duplicate comments (1)
internal/dev/server.go (1)
184-187:⚠️ Potential issueFatal log doesn't properly terminate the program.
The
Fatallog message doesn't actually terminate the program, which could leave it in an inconsistent state after reaching maximum connection failures.Import the
ospackage and add an explicit termination after the fatal log:import ( // existing imports + "os" ) // ... if count >= maxConnectionFailures { s.logger.Fatal("Too many connection failures, giving up after %d attempts (%s). You may need to re-run `agentuity dev`. If this error persists, please contact support.", count, time.Since(started)) + os.Exit(1) return }
🧹 Nitpick comments (3)
internal/dev/server.go (3)
62-62: Remove unused fieldsrv.The static analysis tool has identified that the
srvfield in theServerstruct is unused. Consider removing this field to improve code cleanliness and memory usage.- srv *http2.Server🧰 Tools
🪛 golangci-lint (1.64.8)
62-62: field
srvis unused(unused)
66-70: Consider consolidating mutex locks.The code now uses two separate mutexes:
connectionLockfor serializing connection attempts andreconnectMutexfor protecting failure tracking variables. Having multiple locks increases complexity and potential for deadlocks.Consider using a single mutex for all connection-related state:
connectionLock sync.Mutex -reconnectFailures int -connectionFailed time.Time -connectionStarted time.Time -reconnectMutex sync.Mutex +// Connection state +reconnectFailures int +connectionFailed time.Time +connectionStarted time.TimeThen update all lock operations to use just the
connectionLock.
188-188: Consider using exponential backoff for reconnection attempts.The current implementation uses linear backoff (250ms * failure count) which may not be optimal for handling transient network issues.
Replace with an exponential backoff strategy for more effective reconnection handling:
- wait := time.Millisecond * 250 * time.Duration(count) + baseDelay := time.Millisecond * 250 + wait := baseDelay * time.Duration(math.Pow(2, float64(count-1))) + // Optional: Add jitter and cap maximum wait time + maxWait := time.Second * 30 + if wait > maxWait { + wait = maxWait + }This is similar to how you implemented the health check backoff on lines 525-526.
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📒 Files selected for processing (1)
internal/dev/server.go(3 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (1)
internal/dev/server.go (2)
internal/project/project.go (1)
ProjectContext(455-464)internal/util/api.go (1)
APIClient(35-41)
🪛 golangci-lint (1.64.8)
internal/dev/server.go
62-62: field srv is unused
(unused)
⏰ Context from checks skipped due to timeout of 90000ms (1)
- GitHub Check: Build and Test (windows-latest)
🔇 Additional comments (3)
internal/dev/server.go (3)
159-164: Good implementation of connection locking.The addition of a connection lock effectively prevents multiple goroutines from attempting to reconnect simultaneously, addressing the previous issue of unbounded goroutine creation.
174-183: Good mutex protection for failure tracking.The mutex protection around connection failure tracking variables properly addresses the previous data race concerns, as you're capturing the local count variable within the lock before using it later.
225-234: Well-structured connection success handling.Properly resetting connection failure counters and timestamps on successful connection with appropriate mutex protection provides good state management.
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