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fix: close server pty connections on client disconnect #15201

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Merged
merged 2 commits into from
Oct 24, 2024
Merged

fix: close server pty connections on client disconnect #15201

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e1a4f0b
fix: close server pty connections on client disconnect
f0ssel Oct 23, 2024
3e2717d
fix typo
f0ssel Oct 23, 2024
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23 changes: 20 additions & 3 deletions coderd/httpapi/websocket.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,10 @@ package httpapi

import (
"context"
"errors"
"time"

"golang.org/x/xerrors"
"nhooyr.io/websocket"

"cdr.dev/slog"
Expand Down Expand Up @@ -31,7 +33,8 @@ func Heartbeat(ctx context.Context, conn *websocket.Conn) {
// Heartbeat loops to ping a WebSocket to keep it alive. It calls `exit` on ping
// failure.
func HeartbeatClose(ctx context.Context, logger slog.Logger, exit func(), conn *websocket.Conn) {
ticker := time.NewTicker(15 * time.Second)
interval := 15 * time.Second
ticker := time.NewTicker(interval)
defer ticker.Stop()

for {
Expand All @@ -40,12 +43,26 @@ func HeartbeatClose(ctx context.Context, logger slog.Logger, exit func(), conn *
return
case <-ticker.C:
}
err := conn.Ping(ctx)
err := pingWithTimeout(ctx, conn, interval)
if err != nil {
// context.DeadlineExceeded is expected when the client disconnects without sending a close frame
if !errors.Is(err, context.DeadlineExceeded) {
logger.Error(ctx, "failed to heartbeat ping", slog.Error(err))
}
_ = conn.Close(websocket.StatusGoingAway, "Ping failed")
logger.Info(ctx, "failed to heartbeat ping", slog.Error(err))
exit()
return
}
}
}

func pingWithTimeout(ctx context.Context, conn *websocket.Conn, timeout time.Duration) error {
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
err := conn.Ping(ctx)
if err != nil {
return xerrors.Errorf("failed to ping: %w", err)
}

return nil
}
7 changes: 3 additions & 4 deletions coderd/workspaceapps/proxy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -593,7 +593,6 @@ func (s *Server) proxyWorkspaceApp(rw http.ResponseWriter, r *http.Request, appT
tracing.EndHTTPSpan(r, http.StatusOK, trace.SpanFromContext(ctx))

report := newStatsReportFromSignedToken(appToken)
s.collectStats(report)
defer func() {
// We must use defer here because ServeHTTP may panic.
report.SessionEndedAt = dbtime.Now()
Expand All @@ -614,7 +613,8 @@ func (s *Server) proxyWorkspaceApp(rw http.ResponseWriter, r *http.Request, appT
// @Success 101
// @Router /workspaceagents/{workspaceagent}/pty [get]
func (s *Server) workspaceAgentPTY(rw http.ResponseWriter, r *http.Request) {
ctx := r.Context()
ctx, cancel := context.WithCancel(r.Context())
defer cancel()

s.websocketWaitMutex.Lock()
s.websocketWaitGroup.Add(1)
Expand Down Expand Up @@ -670,12 +670,11 @@ func (s *Server) workspaceAgentPTY(rw http.ResponseWriter, r *http.Request) {
})
return
}
go httpapi.HeartbeatClose(ctx, s.Logger, cancel, conn)

ctx, wsNetConn := WebsocketNetConn(ctx, conn, websocket.MessageBinary)
defer wsNetConn.Close() // Also closes conn.

go httpapi.Heartbeat(ctx, conn)

agentConn, release, err := s.AgentProvider.AgentConn(ctx, appToken.AgentID)
if err != nil {
log.Debug(ctx, "dial workspace agent", slog.Error(err))
Expand Down
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