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[bugfix] Fix occasionally streaming empty messages (#3456)

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tobi 2024-10-18 15:43:09 +02:00 • committed by GitHub
commit ffc86f9092
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1 changed files with 39 additions and 23 deletions
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62
internal/api/client/streaming/stream.go
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@ -35,6 +35,8 @@ import (
"github.com/gorilla/websocket"
)
var pingMsg = []byte("ping!")
// StreamGETHandler swagger:operation GET /api/v1/streaming streamGet
//
// Initiate a websocket connection for live streaming of statuses and notifications.
@ -389,40 +391,54 @@ func (m *Module) writeToWSConn(
) {
for {
// Wrap context with timeout to send a ping.
pingctx, cncl := context.WithTimeout(ctx, ping)
pingCtx, cncl := context.WithTimeout(ctx, ping)
// Block on receipt of msg.
msg, ok := stream.Recv(pingctx)
// Block and wait for
// one of the following:
//
// - receipt of msg
// - timeout of pingCtx
// - stream closed.
msg, gotMsg := stream.Recv(pingCtx)
// Check if cancel because ping.
pinged := (pingctx.Err() != nil)
// If ping context has timed
// out, we should send a ping.
//
// In any case cancel pingCtx
// as we're done with it.
shouldPing := (pingCtx.Err() != nil)
cncl()
switch {
case !ok && pinged:
// The ping context timed out!
l.Trace("writing websocket ping")
// Wrapped context time-out, send a keep-alive "ping".
if err := wsConn.WriteControl(websocket.PingMessage, nil, time.Time{}); err != nil {
// We have a message to stream.
case gotMsg:
l.Tracef("writing websocket message: %+v", msg)
if err := wsConn.WriteJSON(msg); err != nil {
// If there's an error writing then drop the
// connection, as client may have disappeared
// suddenly; they can reconnect if necessary.
l.Debugf("error writing websocket message: %v", err)
break
}
// We have no message but we
// need to send a keep-alive ping.
case shouldPing:
l.Trace("writing websocket ping")
if err := wsConn.WriteControl(websocket.PingMessage, pingMsg, time.Time{}); err != nil {
// If there's an error writing then drop the
// connection, as client may have disappeared
// suddenly; they can reconnect if necessary.
l.Debugf("error writing websocket ping: %v", err)
break
}
case !ok:
// Stream was
// closed.
// We have no message and we shouldn't
// send a ping; this means the stream
// has been closed from the client's end.
default:
return
}
l.Trace("writing websocket message: %+v", msg)
// Received a new message from the processor.
if err := wsConn.WriteJSON(msg); err != nil {
l.Debugf("error writing websocket message: %v", err)
break
}
}
l.Debug("finished websocket write")
}