| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package callbacks |
| |
| import ( |
| "context" |
| stdsync "sync" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-kubernetes/pkg/core" |
| core_model "github.com/apache/dubbo-kubernetes/pkg/core/resources/model" |
| core_xds "github.com/apache/dubbo-kubernetes/pkg/core/xds" |
| util_watchdog "github.com/apache/dubbo-kubernetes/pkg/util/watchdog" |
| ) |
| |
| var dataplaneSyncTrackerLog = core.Log.WithName("xds-server").WithName("dataplane-sync-tracker") |
| |
| type NewDataplaneWatchdogFunc func(key core_model.ResourceKey) util_watchdog.Watchdog |
| |
| func NewDataplaneSyncTracker(factoryFunc NewDataplaneWatchdogFunc) DataplaneCallbacks { |
| return &dataplaneSyncTracker{ |
| newDataplaneWatchdog: factoryFunc, |
| watchdogs: map[core_model.ResourceKey]context.CancelFunc{}, |
| } |
| } |
| |
| var _ DataplaneCallbacks = &dataplaneSyncTracker{} |
| |
| // dataplaneSyncTracker tracks XDS streams that are connected to the CP and fire up a watchdog. |
| // Watchdog should be run only once for given dataplane regardless of the number of streams. |
| // For ADS there is only one stream for DP. |
| // |
| // Node info can be (but does not have to be) carried only on the first XDS request. That's why need streamsAssociation map |
| // that indicates that the stream was already associated |
| type dataplaneSyncTracker struct { |
| NoopDataplaneCallbacks |
| |
| newDataplaneWatchdog NewDataplaneWatchdogFunc |
| |
| stdsync.RWMutex // protects access to the fields below |
| watchdogs map[core_model.ResourceKey]context.CancelFunc |
| } |
| |
| func (t *dataplaneSyncTracker) OnProxyConnected(streamID core_xds.StreamID, dpKey core_model.ResourceKey, _ context.Context, _ core_xds.DataplaneMetadata) error { |
| // We use OnProxyConnected because there should be only one watchdog for given dataplane. |
| t.Lock() |
| defer t.Unlock() |
| |
| stopCh := make(chan struct{}) |
| |
| t.watchdogs[dpKey] = func() { |
| dataplaneSyncTrackerLog.V(1).Info("stopping Watchdog for a Dataplane", "dpKey", dpKey, "streamID", streamID) |
| close(stopCh) |
| } |
| dataplaneSyncTrackerLog.V(1).Info("starting Watchdog for a Dataplane", "dpKey", dpKey, "streamID", streamID) |
| go t.newDataplaneWatchdog(dpKey).Start(stopCh) |
| return nil |
| } |
| |
| func (t *dataplaneSyncTracker) OnProxyDisconnected(_ context.Context, _ core_xds.StreamID, dpKey core_model.ResourceKey) { |
| t.Lock() |
| defer t.Unlock() |
| if cancelFn := t.watchdogs[dpKey]; cancelFn != nil { |
| cancelFn() |
| } |
| delete(t.watchdogs, dpKey) |
| } |