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Bug fix #2718 appservice txnid should be different for each batch of events (#2719)

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See issue: [#2718](https://github.com/matrix-org/dendrite/issues/2718)
for more details.

The fix assumes that if the number of transaction items are different,
then the txnid should be different.

txnid := OriginalServerTS()_len(transactions) 

The case that it doesn't address is if the txnid generated this way is
the same for 2 different batches of events which have the same
OriginalServerTS and the same array length.

Another option:

txnid := OriginalServerTS()_hash(transactions)

Would love to hear other ideas and ways to fix this.

### Pull Request Checklist

* [x ] I have added added tests for PR _or_ I have justified why this PR
doesn't need tests.
* [x ] Pull request includes a [sign
off](https://github.com/matrix-org/dendrite/blob/main/docs/CONTRIBUTING.md#sign-off)

Signed-off-by: `Tak Wai Wong <tak@hntlabs.com>`

Co-authored-by: Tak Wai Wong <tak@hntlabs.com>
This commit is contained in:
Tak Wai Wong 2022-09-19 09:39:06 -07:00 committed by GitHub
parent 7bfc3074d1
commit 99f6b6a952
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 5 deletions
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20
appservice/consumers/roomserver.go
View file

@ -22,6 +22,7 @@ import (
"math"
"net/http"
"net/url"
"strconv"
"time"
"github.com/matrix-org/gomatrixserverlib"
@ -151,10 +152,17 @@ func (s *OutputRoomEventConsumer) onMessage(
return true
}
txnID := ""
// Try to get the message metadata, if we're able to, use the timestamp as the txnID
metadata, err := msgs[0].Metadata()
if err == nil {
txnID = strconv.Itoa(int(metadata.Timestamp.UnixNano()))
}
// Send event to any relevant application services. If we hit
// an error here, return false, so that we negatively ack.
log.WithField("appservice", state.ID).Debugf("Appservice worker sending %d events(s) from roomserver", len(events))
return s.sendEvents(ctx, state, events) == nil
return s.sendEvents(ctx, state, events, txnID) == nil
}
// sendEvents passes events to the appservice by using the transactions
@ -162,6 +170,7 @@ func (s *OutputRoomEventConsumer) onMessage(
func (s *OutputRoomEventConsumer) sendEvents(
ctx context.Context, state *appserviceState,
events []*gomatrixserverlib.HeaderedEvent,
txnID string,
) error {
// Create the transaction body.
transaction, err := json.Marshal(
@ -173,13 +182,14 @@ func (s *OutputRoomEventConsumer) sendEvents(
return err
}
// TODO: We should probably be more intelligent and pick something not
// in the control of the event. A NATS timestamp header or something maybe.
txnID := events[0].Event.OriginServerTS()
// If txnID is not defined, generate one from the events.
if txnID == "" {
txnID = fmt.Sprintf("%d_%d", events[0].Event.OriginServerTS(), len(transaction))
}
// Send the transaction to the appservice.
// https://matrix.org/docs/spec/application_service/r0.1.2#put-matrix-app-v1-transactions-txnid
address := fmt.Sprintf("%s/transactions/%d?access_token=%s", state.URL, txnID, url.QueryEscape(state.HSToken))
address := fmt.Sprintf("%s/transactions/%s?access_token=%s", state.URL, txnID, url.QueryEscape(state.HSToken))
req, err := http.NewRequestWithContext(ctx, "PUT", address, bytes.NewBuffer(transaction))
if err != nil {
return err