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syncapi: don't return early for no-op incremental syncs (#2473)
* syncapi: don't return early for no-op incremental syncs Comments explain why, but basically it's an inefficient use of bandwidth and some sytests rely on /sync to block. * Honour timeouts * Actually return a response with timeout=0
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kegsay
GitHub
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21dd5a7176
@ -251,125 +251,151 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *userapi.
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waitingSyncRequests.Inc()
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defer waitingSyncRequests.Dec()
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currentPos := rp.Notifier.CurrentPosition()
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// loop until we get some data
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for {
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startTime := time.Now()
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currentPos := rp.Notifier.CurrentPosition()
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if !rp.shouldReturnImmediately(syncReq, currentPos) {
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timer := time.NewTimer(syncReq.Timeout) // case of timeout=0 is handled above
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defer timer.Stop()
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// if the since token matches the current positions, wait via the notifier
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if !rp.shouldReturnImmediately(syncReq, currentPos) {
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timer := time.NewTimer(syncReq.Timeout) // case of timeout=0 is handled above
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defer timer.Stop()
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userStreamListener := rp.Notifier.GetListener(*syncReq)
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defer userStreamListener.Close()
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userStreamListener := rp.Notifier.GetListener(*syncReq)
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defer userStreamListener.Close()
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giveup := func() util.JSONResponse {
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syncReq.Log.Debugln("Responding to sync since client gave up or timeout was reached")
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syncReq.Response.NextBatch = syncReq.Since
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// We should always try to include OTKs in sync responses, otherwise clients might upload keys
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// even if that's not required. See also:
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// https://github.com/matrix-org/synapse/blob/29f06704b8871a44926f7c99e73cf4a978fb8e81/synapse/rest/client/sync.py#L276-L281
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// Only try to get OTKs if the context isn't already done.
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if syncReq.Context.Err() == nil {
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err = internal.DeviceOTKCounts(syncReq.Context, rp.keyAPI, syncReq.Device.UserID, syncReq.Device.ID, syncReq.Response)
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if err != nil && err != context.Canceled {
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syncReq.Log.WithError(err).Warn("failed to get OTK counts")
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giveup := func() util.JSONResponse {
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syncReq.Log.Debugln("Responding to sync since client gave up or timeout was reached")
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syncReq.Response.NextBatch = syncReq.Since
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// We should always try to include OTKs in sync responses, otherwise clients might upload keys
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// even if that's not required. See also:
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// https://github.com/matrix-org/synapse/blob/29f06704b8871a44926f7c99e73cf4a978fb8e81/synapse/rest/client/sync.py#L276-L281
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// Only try to get OTKs if the context isn't already done.
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if syncReq.Context.Err() == nil {
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err = internal.DeviceOTKCounts(syncReq.Context, rp.keyAPI, syncReq.Device.UserID, syncReq.Device.ID, syncReq.Response)
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if err != nil && err != context.Canceled {
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syncReq.Log.WithError(err).Warn("failed to get OTK counts")
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: syncReq.Response,
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: syncReq.Response,
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select {
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case <-syncReq.Context.Done(): // Caller gave up
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return giveup()
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case <-timer.C: // Timeout reached
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return giveup()
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case <-userStreamListener.GetNotifyChannel(syncReq.Since):
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syncReq.Log.Debugln("Responding to sync after wake-up")
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currentPos.ApplyUpdates(userStreamListener.GetSyncPosition())
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}
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} else {
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syncReq.Log.WithField("currentPos", currentPos).Debugln("Responding to sync immediately")
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}
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if syncReq.Since.IsEmpty() {
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// Complete sync
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syncReq.Response.NextBatch = types.StreamingToken{
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PDUPosition: rp.streams.PDUStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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TypingPosition: rp.streams.TypingStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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ReceiptPosition: rp.streams.ReceiptStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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InvitePosition: rp.streams.InviteStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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SendToDevicePosition: rp.streams.SendToDeviceStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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AccountDataPosition: rp.streams.AccountDataStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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NotificationDataPosition: rp.streams.NotificationDataStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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DeviceListPosition: rp.streams.DeviceListStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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PresencePosition: rp.streams.PresenceStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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}
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} else {
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// Incremental sync
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syncReq.Response.NextBatch = types.StreamingToken{
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PDUPosition: rp.streams.PDUStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.PDUPosition, currentPos.PDUPosition,
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),
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TypingPosition: rp.streams.TypingStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.TypingPosition, currentPos.TypingPosition,
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),
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ReceiptPosition: rp.streams.ReceiptStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.ReceiptPosition, currentPos.ReceiptPosition,
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),
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InvitePosition: rp.streams.InviteStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.InvitePosition, currentPos.InvitePosition,
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),
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SendToDevicePosition: rp.streams.SendToDeviceStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.SendToDevicePosition, currentPos.SendToDevicePosition,
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),
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AccountDataPosition: rp.streams.AccountDataStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.AccountDataPosition, currentPos.AccountDataPosition,
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),
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NotificationDataPosition: rp.streams.NotificationDataStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.NotificationDataPosition, currentPos.NotificationDataPosition,
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),
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DeviceListPosition: rp.streams.DeviceListStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.DeviceListPosition, currentPos.DeviceListPosition,
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),
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PresencePosition: rp.streams.PresenceStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.PresencePosition, currentPos.PresencePosition,
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),
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}
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// it's possible for there to be no updates for this user even though since < current pos,
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// e.g busy servers with a quiet user. In this scenario, we don't want to return a no-op
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// response immediately, so let's try this again but pretend they bumped their since token.
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// If the incremental sync was processed very quickly then we expect the next loop to block
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// with a notifier, but if things are slow it's entirely possible that currentPos is no
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// longer the current position so we will hit this code path again. We need to do this and
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// not return a no-op response because:
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// - It's an inefficient use of bandwidth.
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// - Some sytests which test 'waking up' sync rely on some sync requests to block, which
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// they weren't always doing, resulting in flakey tests.
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if !syncReq.Response.HasUpdates() {
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syncReq.Since = currentPos
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// do not loop again if the ?timeout= is 0 as that means "return immediately"
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if syncReq.Timeout > 0 {
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syncReq.Timeout = syncReq.Timeout - time.Since(startTime)
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if syncReq.Timeout < 0 {
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syncReq.Timeout = 0
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}
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continue
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}
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}
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}
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select {
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case <-syncReq.Context.Done(): // Caller gave up
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return giveup()
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case <-timer.C: // Timeout reached
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return giveup()
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case <-userStreamListener.GetNotifyChannel(syncReq.Since):
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syncReq.Log.Debugln("Responding to sync after wake-up")
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currentPos.ApplyUpdates(userStreamListener.GetSyncPosition())
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: syncReq.Response,
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}
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} else {
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syncReq.Log.WithField("currentPos", currentPos).Debugln("Responding to sync immediately")
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}
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if syncReq.Since.IsEmpty() {
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// Complete sync
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syncReq.Response.NextBatch = types.StreamingToken{
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PDUPosition: rp.streams.PDUStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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TypingPosition: rp.streams.TypingStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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ReceiptPosition: rp.streams.ReceiptStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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InvitePosition: rp.streams.InviteStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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SendToDevicePosition: rp.streams.SendToDeviceStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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AccountDataPosition: rp.streams.AccountDataStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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NotificationDataPosition: rp.streams.NotificationDataStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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DeviceListPosition: rp.streams.DeviceListStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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PresencePosition: rp.streams.PresenceStreamProvider.CompleteSync(
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syncReq.Context, syncReq,
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),
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}
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} else {
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// Incremental sync
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syncReq.Response.NextBatch = types.StreamingToken{
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PDUPosition: rp.streams.PDUStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.PDUPosition, currentPos.PDUPosition,
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),
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TypingPosition: rp.streams.TypingStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.TypingPosition, currentPos.TypingPosition,
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),
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ReceiptPosition: rp.streams.ReceiptStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.ReceiptPosition, currentPos.ReceiptPosition,
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),
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InvitePosition: rp.streams.InviteStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.InvitePosition, currentPos.InvitePosition,
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),
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SendToDevicePosition: rp.streams.SendToDeviceStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.SendToDevicePosition, currentPos.SendToDevicePosition,
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),
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AccountDataPosition: rp.streams.AccountDataStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.AccountDataPosition, currentPos.AccountDataPosition,
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),
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NotificationDataPosition: rp.streams.NotificationDataStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.NotificationDataPosition, currentPos.NotificationDataPosition,
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),
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DeviceListPosition: rp.streams.DeviceListStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.DeviceListPosition, currentPos.DeviceListPosition,
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),
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PresencePosition: rp.streams.PresenceStreamProvider.IncrementalSync(
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syncReq.Context, syncReq,
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syncReq.Since.PresencePosition, currentPos.PresencePosition,
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),
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: syncReq.Response,
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}
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}
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@ -350,6 +350,19 @@ type Response struct {
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DeviceListsOTKCount map[string]int `json:"device_one_time_keys_count,omitempty"`
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}
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func (r *Response) HasUpdates() bool {
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// purposefully exclude DeviceListsOTKCount as we always include them
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return (len(r.AccountData.Events) > 0 ||
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len(r.Presence.Events) > 0 ||
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len(r.Rooms.Invite) > 0 ||
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len(r.Rooms.Join) > 0 ||
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len(r.Rooms.Leave) > 0 ||
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len(r.Rooms.Peek) > 0 ||
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len(r.ToDevice.Events) > 0 ||
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len(r.DeviceLists.Changed) > 0 ||
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len(r.DeviceLists.Left) > 0)
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}
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// NewResponse creates an empty response with initialised maps.
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func NewResponse() *Response {
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res := Response{}
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