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dataplane_sync_tracker.go
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dataplane_sync_tracker.go
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/*
* 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)
}