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Try to retrieve missing auth events from multiple servers (#1516)

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* Recursively fetch auth events if needed

* Fix processEvent call

* Ask more servers in lookupEvent

* Don't panic!

* Panic at the Disco

* Find servers more aggressively

* Add getServers

* Fix number of servers to 5, don't bail making RespState if auth events missing

* Fix panic

* Ignore missing state events too

* Report number of servers correctly

* Don't reuse request context for /send_join

* Update federation API tests

* Don't recurse processEvents

* Implement getEvents differently
This commit is contained in:
Neil Alexander 2020-10-13 11:53:20 +01:00 • committed by GitHub
parent d7ea814fa8
commit 9d6b77c58a
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3 changed files with 130 additions and 75 deletions
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14
federationsender/internal/perform.go
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@ -196,6 +196,11 @@ func (r *FederationSenderInternalAPI) performJoinUsingServer(
return fmt.Errorf("respMakeJoin.JoinEvent.Build: %w", err)
}
// No longer reuse the request context from this point forward.
// We don't want the client timing out to interrupt the join.
var cancel context.CancelFunc
ctx, cancel = context.WithCancel(context.Background())
// Try to perform a send_join using the newly built event.
respSendJoin, err := r.federation.SendJoin(
ctx,
@ -205,11 +210,16 @@ func (r *FederationSenderInternalAPI) performJoinUsingServer(
)
if err != nil {
r.statistics.ForServer(serverName).Failure()
cancel()
return fmt.Errorf("r.federation.SendJoin: %w", err)
}
r.statistics.ForServer(serverName).Success()
// Sanity-check the join response to ensure that it has a create
// event, that the room version is known, etc.
if err := sanityCheckSendJoinResponse(respSendJoin); err != nil {
return err
cancel()
return fmt.Errorf("sanityCheckSendJoinResponse: %w", err)
}
// Process the join response in a goroutine. The idea here is
@ -217,8 +227,6 @@ func (r *FederationSenderInternalAPI) performJoinUsingServer(
// to complete, but if the client does give up waiting, we'll
// still continue to process the join anyway so that we don't
// waste the effort.
var cancel context.CancelFunc
ctx, cancel = context.WithCancel(context.Background())
go func() {
defer cancel()