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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| // Copyright 2023 TiKV Project Authors. | ||
| // | ||
| // Licensed 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 meta | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
|
|
||
| "github.com/gogo/protobuf/proto" | ||
| "github.com/pingcap/kvproto/pkg/metapb" | ||
| "github.com/pingcap/log" | ||
| "github.com/tikv/pd/pkg/core" | ||
| "github.com/tikv/pd/pkg/storage/endpoint" | ||
| "github.com/tikv/pd/pkg/utils/etcdutil" | ||
| "go.etcd.io/etcd/clientv3" | ||
| "go.etcd.io/etcd/mvcc/mvccpb" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| // Watcher is used to watch the PD API server for any meta changes. | ||
| type Watcher struct { | ||
| wg sync.WaitGroup | ||
| ctx context.Context | ||
| cancel context.CancelFunc | ||
| clusterID uint64 | ||
| // storePathPrefix is the path of the store in etcd: | ||
| // - Key: /pd/{cluster_id}/raft/s/ | ||
| // - Value: meta store proto. | ||
| storePathPrefix string | ||
|
|
||
| etcdClient *clientv3.Client | ||
| basicCluster *core.BasicCluster | ||
| storeWatcher *etcdutil.LoopWatcher | ||
| } | ||
|
|
||
| // NewWatcher creates a new watcher to watch the meta change from PD API server. | ||
| func NewWatcher( | ||
| ctx context.Context, | ||
| etcdClient *clientv3.Client, | ||
| clusterID uint64, | ||
| basicCluster *core.BasicCluster, | ||
| ) (*Watcher, error) { | ||
| ctx, cancel := context.WithCancel(ctx) | ||
| w := &Watcher{ | ||
| ctx: ctx, | ||
| cancel: cancel, | ||
| clusterID: clusterID, | ||
| storePathPrefix: endpoint.StorePathPrefix(clusterID), | ||
| etcdClient: etcdClient, | ||
| basicCluster: basicCluster, | ||
| } | ||
| err := w.initializeStoreWatcher() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return w, nil | ||
| } | ||
|
|
||
| func (w *Watcher) initializeStoreWatcher() error { | ||
| putFn := func(kv *mvccpb.KeyValue) error { | ||
| store := &metapb.Store{} | ||
| if err := proto.Unmarshal(kv.Value, store); err != nil { | ||
| log.Warn("failed to unmarshal store entry", | ||
| zap.String("event-kv-key", string(kv.Key)), zap.Error(err)) | ||
| return err | ||
| } | ||
| origin := w.basicCluster.GetStore(store.GetId()) | ||
| if origin == nil { | ||
| w.basicCluster.PutStore(core.NewStoreInfo(store)) | ||
| return nil | ||
| } | ||
| w.basicCluster.PutStore(origin.Clone(core.SetStoreState(store.GetState(), store.GetPhysicallyDestroyed()))) | ||
| return nil | ||
| } | ||
| deleteFn := func(kv *mvccpb.KeyValue) error { | ||
| key := string(kv.Key) | ||
| storeID, err := endpoint.ExtractStoreIDFromPath(w.clusterID, key) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| origin := w.basicCluster.GetStore(storeID) | ||
| if origin != nil { | ||
| w.basicCluster.DeleteStore(origin) | ||
| } | ||
| return nil | ||
| } | ||
| postEventFn := func() error { | ||
| return nil | ||
| } | ||
| w.storeWatcher = etcdutil.NewLoopWatcher( | ||
| w.ctx, &w.wg, | ||
| w.etcdClient, | ||
| "scheduling-store-watcher", w.storePathPrefix, | ||
| putFn, deleteFn, postEventFn, | ||
| clientv3.WithPrefix(), | ||
| ) | ||
| w.storeWatcher.StartWatchLoop() | ||
| return w.storeWatcher.WaitLoad() | ||
| } | ||
|
|
||
| // Close closes the watcher. | ||
| func (w *Watcher) Close() { | ||
| w.cancel() | ||
| w.wg.Wait() | ||
| } |
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