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Resume federation sends (#2039)

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* Resume federation sends

* Review comments

* Fix build error
This commit is contained in:
Neil Alexander 2021-11-08 09:24:16 +00:00 committed by GitHub
parent b9a575919a
commit 323a6fb54f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 37 additions and 3 deletions
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38
federationapi/routing/send.go
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@ -148,6 +148,7 @@ type inputWorker struct {
input *sendFIFOQueue
}
var inFlightTxnsPerOrigin sync.Map // transaction ID -> chan util.JSONResponse
var inputWorkers sync.Map // room ID -> *inputWorker
// Send implements /_matrix/federation/v1/send/{txnID}
@ -164,6 +165,37 @@ func Send(
mu *internal.MutexByRoom,
servers federationAPI.ServersInRoomProvider,
) util.JSONResponse {
// First we should check if this origin has already submitted this
// txn ID to us. If they have and the txnIDs map contains an entry,
// the transaction is still being worked on. The new client can wait
// for it to complete rather than creating more work.
index := string(request.Origin()) + "\000" + string(txnID)
v, ok := inFlightTxnsPerOrigin.LoadOrStore(index, make(chan util.JSONResponse, 1))
ch := v.(chan util.JSONResponse)
if ok {
// This origin already submitted this txn ID to us, and the work
// is still taking place, so we'll just wait for it to finish.
ctx, cancel := context.WithTimeout(httpReq.Context(), time.Minute*5)
defer cancel()
select {
case <-ctx.Done():
// If the caller gives up then return straight away. We don't
// want to attempt to process what they sent us any further.
return util.JSONResponse{Code: http.StatusRequestTimeout}
case res := <-ch:
// The original task just finished processing so let's return
// the result of it.
if res.Code == 0 {
return util.JSONResponse{Code: http.StatusAccepted}
}
return res
}
}
// Otherwise, store that we're currently working on this txn from
// this origin. When we're done processing, close the channel.
defer close(ch)
defer inFlightTxnsPerOrigin.Delete(index)
t := txnReq{
rsAPI: rsAPI,
eduAPI: eduAPI,
@ -205,7 +237,7 @@ func Send(
util.GetLogger(httpReq.Context()).Infof("Received transaction %q from %q containing %d PDUs, %d EDUs", txnID, request.Origin(), len(t.PDUs), len(t.EDUs))
resp, jsonErr := t.processTransaction(httpReq.Context())
resp, jsonErr := t.processTransaction(context.Background())
if jsonErr != nil {
util.GetLogger(httpReq.Context()).WithField("jsonErr", jsonErr).Error("t.processTransaction failed")
return *jsonErr
@ -215,10 +247,12 @@ func Send(
// Status code 200:
// The result of processing the transaction. The server is to use this response
// even in the event of one or more PDUs failing to be processed.
return util.JSONResponse{
res := util.JSONResponse{
Code: http.StatusOK,
JSON: resp,
}
ch <- res
return res
}
type txnReq struct {