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Add doc and allow returning if timeout is reached

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This commit is contained in:
Brendan Abolivier 2018-12-11 13:30:24 +00:00
parent deb181ea50
commit 6ca505d4b7
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GPG key ID: 8EF1500759F70623
1 changed files with 10 additions and 2 deletions
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12
src/github.com/matrix-org/dendrite/syncapi/sync/requestpool.go
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@ -86,6 +86,12 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *authtype
userStreamListener := rp.notifier.GetListener(*syncReq)
defer userStreamListener.Close()
// We need the loop in case userStreamListener wakes up even if there isn't
// anything to send down. In this case, we'll jump out of the select but
// don't want to send anything back until we get some actual content to
// respond with, so we skip the return an go back to waiting for content to
// be sent down or the request timing out.
var hasTimedOut bool
for {
select {
// Wait for notifier to wake us up
@ -95,7 +101,9 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *authtype
case <-timer.C:
// We just need to ensure we get out of the select after reaching the
// timeout, but there's nothing specific we want to do in this case
// apart from that, so we do nothing.
// apart from that, so we do nothing except stating we're timing out
// and need to respond.
hasTimedOut = true
// Or for the request to be cancelled
case <-req.Context().Done():
return httputil.LogThenError(req, req.Context().Err())
@ -111,7 +119,7 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *authtype
return httputil.LogThenError(req, err)
}
if !syncData.IsEmpty() {
if !syncData.IsEmpty() || hasTimedOut {
return util.JSONResponse{
Code: http.StatusOK,
JSON: syncData,