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GODT-1033 Retry starting IMAP server after connection was down

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This commit is contained in:
Michal Horejsek
2021-02-10 13:52:57 +01:00
parent 7468ed7dc0
commit 341487d839
1 changed files with 20 additions and 5 deletions
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25
internal/imap/server.go
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@ -117,10 +117,12 @@ func (s *imapServer) ListenAndServe() {
go s.monitorDisconnectedUsers()
go s.monitorInternetConnection()
s.listenAndServe()
// When starting the Bridge, we don't want to retry to notify user
// quickly about the issue. Very probably retry will not help anyway.
s.listenAndServe(0)
}
func (s *imapServer) listenAndServe() {
func (s *imapServer) listenAndServe(retries int) {
if s.isRunning.Load().(bool) {
return
}
@ -129,8 +131,16 @@ func (s *imapServer) listenAndServe() {
log.Info("IMAP server listening at ", s.server.Addr)
l, err := net.Listen("tcp", s.server.Addr)
if err != nil {
s.isRunning.Store(false)
if retries > 0 {
log.WithError(err).WithField("retries", retries).Warn("IMAP listener failed")
time.Sleep(15 * time.Second)
s.listenAndServe(retries - 1)
return
}
log.WithError(err).Error("IMAP listener failed")
s.eventListener.Emit(events.ErrorEvent, "IMAP failed: "+err.Error())
log.Error("IMAP failed: ", err)
return
}
@ -142,8 +152,9 @@ func (s *imapServer) listenAndServe() {
// User shouldn't be notified about error if server shouldn't be running,
// but it should in case it was not closed by `s.Close()`.
if err != nil && s.isRunning.Load().(bool) {
s.isRunning.Store(false)
log.WithError(err).Error("IMAP server failed")
s.eventListener.Emit(events.ErrorEvent, "IMAP failed: "+err.Error())
log.Error("IMAP failed: ", err)
return
}
defer s.server.Close() //nolint[errcheck]
@ -176,7 +187,11 @@ func (s *imapServer) monitorInternetConnection() {
case <-on:
go func() {
defer s.panicHandler.HandlePanic()
s.listenAndServe()
// We had issues on Mac that from time to time something
// blocked our port for a bit after we closed IMAP server
// due to connection issues.
// Restart always helped, so we do retry to not bother user.
s.listenAndServe(10)
}()
expectedIsPortFree = false
case <-off: