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Resume federation sends (#2039)
* Resume federation sends * Review comments * Fix build error
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@ -148,7 +148,8 @@ type inputWorker struct {
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input *sendFIFOQueue
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}
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var inputWorkers sync.Map // room ID -> *inputWorker
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var inFlightTxnsPerOrigin sync.Map // transaction ID -> chan util.JSONResponse
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var inputWorkers sync.Map // room ID -> *inputWorker
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// Send implements /_matrix/federation/v1/send/{txnID}
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func Send(
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@ -164,6 +165,37 @@ func Send(
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mu *internal.MutexByRoom,
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servers federationAPI.ServersInRoomProvider,
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) util.JSONResponse {
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// First we should check if this origin has already submitted this
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// txn ID to us. If they have and the txnIDs map contains an entry,
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// the transaction is still being worked on. The new client can wait
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// for it to complete rather than creating more work.
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index := string(request.Origin()) + "\000" + string(txnID)
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v, ok := inFlightTxnsPerOrigin.LoadOrStore(index, make(chan util.JSONResponse, 1))
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ch := v.(chan util.JSONResponse)
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if ok {
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// This origin already submitted this txn ID to us, and the work
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// is still taking place, so we'll just wait for it to finish.
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ctx, cancel := context.WithTimeout(httpReq.Context(), time.Minute*5)
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defer cancel()
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select {
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case <-ctx.Done():
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// If the caller gives up then return straight away. We don't
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// want to attempt to process what they sent us any further.
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return util.JSONResponse{Code: http.StatusRequestTimeout}
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case res := <-ch:
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// The original task just finished processing so let's return
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// the result of it.
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if res.Code == 0 {
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return util.JSONResponse{Code: http.StatusAccepted}
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}
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return res
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}
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}
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// Otherwise, store that we're currently working on this txn from
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// this origin. When we're done processing, close the channel.
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defer close(ch)
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defer inFlightTxnsPerOrigin.Delete(index)
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t := txnReq{
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rsAPI: rsAPI,
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eduAPI: eduAPI,
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@ -205,7 +237,7 @@ func Send(
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util.GetLogger(httpReq.Context()).Infof("Received transaction %q from %q containing %d PDUs, %d EDUs", txnID, request.Origin(), len(t.PDUs), len(t.EDUs))
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resp, jsonErr := t.processTransaction(httpReq.Context())
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resp, jsonErr := t.processTransaction(context.Background())
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if jsonErr != nil {
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util.GetLogger(httpReq.Context()).WithField("jsonErr", jsonErr).Error("t.processTransaction failed")
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return *jsonErr
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@ -215,10 +247,12 @@ func Send(
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// Status code 200:
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// The result of processing the transaction. The server is to use this response
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// even in the event of one or more PDUs failing to be processed.
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return util.JSONResponse{
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res := util.JSONResponse{
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Code: http.StatusOK,
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JSON: resp,
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}
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ch <- res
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return res
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}
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type txnReq struct {
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