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xds: allow only one outstanding delta request at a time (#12236) 

Fixes #11876

This enforces that multiple xDS mutations are not issued on the same ADS connection at once, so that we can 100% control the order that they are applied. The original code made assumptions about the way multiple in-flight mutations were applied on the Envoy side that was incorrect.
This commit is contained in:
R.B. Boyer 2022-02-08 10:36:48 -06:00 committed by GitHub
parent ed719d58cf
commit 0cd0d505fa
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 18 additions and 19 deletions
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3
.changelog/12236.txt Normal file
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@ -0,0 +1,3 @@
```release-note:bug
xds: allow only one outstanding delta request at a time
```

6
agent/xds/delta.go
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@ -289,11 +289,7 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
generator.Logger.Trace("Invoking all xDS resource handlers and sending changed data if there are any")
sentType := make(map[string]struct{}) // use this to only do one kind of mutation per type per execution
for _, op := range xDSUpdateOrder {
if _, sent := sentType[op.TypeUrl]; sent {
continue
}
err, sent := handlers[op.TypeUrl].SendIfNew(
cfgSnap.Kind,
currentVersions[op.TypeUrl],
@ -309,7 +305,7 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
op.TypeUrl, err)
}
if sent {
sentType[op.TypeUrl] = struct{}{}
break // wait until we get an ACK to do more
}
}
}

28
agent/xds/delta_test.go
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@ -895,20 +895,8 @@ func TestServer_DeltaAggregatedResources_v3_BasicProtocol_HTTP2_RDS_listenerChan
),
})
// the listener is updated
assertDeltaResponseSent(t, envoy.deltaStream.sendCh, &envoy_discovery_v3.DeltaDiscoveryResponse{
TypeUrl: ListenerType,
Nonce: hexString(6),
Resources: makeTestResources(t,
makeTestListener(t, snap, "http:db:rds"),
),
})
envoy.SendDeltaReqACK(t, ClusterType, 5)
// ACKs the listener
envoy.SendDeltaReqACK(t, ListenerType, 6)
// The behaviors of Cluster updates triggering re-sends of Endpoint updates
// tested in TestServer_DeltaAggregatedResources_v3_BasicProtocol_TCP_clusterChangesImpactEndpoints
// triggers here. It is not explicitly under test, but we have to get past
@ -916,13 +904,25 @@ func TestServer_DeltaAggregatedResources_v3_BasicProtocol_HTTP2_RDS_listenerChan
assertDeltaResponseSent(t, envoy.deltaStream.sendCh, &envoy_discovery_v3.DeltaDiscoveryResponse{
TypeUrl: EndpointType,
Nonce: hexString(7),
Nonce: hexString(6),
Resources: makeTestResources(t,
makeTestEndpoints(t, snap, "http:db"),
),
})
envoy.SendDeltaReqACK(t, EndpointType, 7)
envoy.SendDeltaReqACK(t, EndpointType, 6)
// the listener is updated
assertDeltaResponseSent(t, envoy.deltaStream.sendCh, &envoy_discovery_v3.DeltaDiscoveryResponse{
TypeUrl: ListenerType,
Nonce: hexString(7),
Resources: makeTestResources(t,
makeTestListener(t, snap, "http:db:rds"),
),
})
// ACKs the listener
envoy.SendDeltaReqACK(t, ListenerType, 7)
// THE ACTUAL THING WE CARE ABOUT: replaced route config
assertDeltaResponseSent(t, envoy.deltaStream.sendCh, &envoy_discovery_v3.DeltaDiscoveryResponse{