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fix: Add lock around read/write of circular buffer (#1258)

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This fixes a race seen in:
https://github.com/coder/coder/runs/6260926628?check_suite_focus=true#step:10:666
This commit is contained in:
Kyle Carberry
2022-05-02 12:31:04 -05:00
committed by GitHub
parent 7fb3c5728b
commit 3d96785bf5
1 changed files with 8 additions and 3 deletions
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11
agent/agent.go
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@ -518,7 +518,9 @@ func (a *agent) handleReconnectingPTY(ctx context.Context, rawID string, conn ne
break
}
part := buffer[:read]
rpty.circularBufferMutex.Lock()
_, err = rpty.circularBuffer.Write(part)
rpty.circularBufferMutex.Unlock()
if err != nil {
a.logger.Error(ctx, "reconnecting pty write buffer", slog.Error(err), slog.F("id", id))
break
@ -545,7 +547,9 @@ func (a *agent) handleReconnectingPTY(ctx context.Context, rawID string, conn ne
a.logger.Error(ctx, "resize reconnecting pty", slog.F("id", id), slog.Error(err))
}
// Write any previously stored data for the TTY.
rpty.circularBufferMutex.RLock()
_, err = conn.Write(rpty.circularBuffer.Bytes())
rpty.circularBufferMutex.RUnlock()
if err != nil {
a.logger.Warn(ctx, "write reconnecting pty buffer", slog.F("id", id), slog.Error(err))
return
@ -640,9 +644,10 @@ type reconnectingPTY struct {
activeConnsMutex sync.Mutex
activeConns map[string]net.Conn
circularBuffer *circbuf.Buffer
timeout *time.Timer
ptty pty.PTY
circularBuffer *circbuf.Buffer
circularBufferMutex sync.RWMutex
timeout *time.Timer
ptty pty.PTY
}
// Close ends all connections to the reconnecting