mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
131 lines
3.7 KiB
Go
131 lines
3.7 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build cluster_proxy
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// +build cluster_proxy
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package integration
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import (
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"context"
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"sync"
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"go.etcd.io/etcd/client/v3"
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"go.etcd.io/etcd/client/v3/namespace"
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"go.etcd.io/etcd/server/v3/proxy/grpcproxy"
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"go.etcd.io/etcd/server/v3/proxy/grpcproxy/adapter"
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)
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const ThroughProxy = true
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var (
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pmu sync.Mutex
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proxies map[*clientv3.Client]grpcClientProxy = make(map[*clientv3.Client]grpcClientProxy)
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)
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const proxyNamespace = "proxy-namespace"
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type grpcClientProxy struct {
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ctx context.Context
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ctxCancel func()
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grpc GrpcAPI
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wdonec <-chan struct{}
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kvdonec <-chan struct{}
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lpdonec <-chan struct{}
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}
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func ToGRPC(c *clientv3.Client) GrpcAPI {
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pmu.Lock()
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defer pmu.Unlock()
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// dedicated context bound to 'grpc-proxy' lifetype
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// (so in practice lifetime of the client connection to the proxy).
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// TODO: Refactor to a separate clientv3.Client instance instead of the context alone.
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ctx, ctxCancel := context.WithCancel(context.WithValue(context.TODO(), "_name", "grpcProxyContext"))
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lg := c.GetLogger()
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if v, ok := proxies[c]; ok {
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return v.grpc
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}
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// test namespacing proxy
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c.KV = namespace.NewKV(c.KV, proxyNamespace)
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c.Watcher = namespace.NewWatcher(c.Watcher, proxyNamespace)
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c.Lease = namespace.NewLease(c.Lease, proxyNamespace)
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// test coalescing/caching proxy
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kvp, kvpch := grpcproxy.NewKvProxy(c)
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wp, wpch := grpcproxy.NewWatchProxy(ctx, lg, c)
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lp, lpch := grpcproxy.NewLeaseProxy(ctx, c)
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mp := grpcproxy.NewMaintenanceProxy(c)
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clp, _ := grpcproxy.NewClusterProxy(lg, c, "", "") // without registering proxy URLs
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authp := grpcproxy.NewAuthProxy(c)
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lockp := grpcproxy.NewLockProxy(c)
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electp := grpcproxy.NewElectionProxy(c)
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grpc := GrpcAPI{
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adapter.ClusterServerToClusterClient(clp),
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adapter.KvServerToKvClient(kvp),
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adapter.LeaseServerToLeaseClient(lp),
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adapter.WatchServerToWatchClient(wp),
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adapter.MaintenanceServerToMaintenanceClient(mp),
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adapter.AuthServerToAuthClient(authp),
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adapter.LockServerToLockClient(lockp),
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adapter.ElectionServerToElectionClient(electp),
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}
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proxies[c] = grpcClientProxy{ctx: ctx, ctxCancel: ctxCancel, grpc: grpc, wdonec: wpch, kvdonec: kvpch, lpdonec: lpch}
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return grpc
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}
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type proxyCloser struct {
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clientv3.Watcher
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proxyCtxCancel func()
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wdonec <-chan struct{}
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kvdonec <-chan struct{}
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lclose func()
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lpdonec <-chan struct{}
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}
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func (pc *proxyCloser) Close() error {
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pc.proxyCtxCancel()
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<-pc.kvdonec
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err := pc.Watcher.Close()
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<-pc.wdonec
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pc.lclose()
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<-pc.lpdonec
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return err
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}
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func newClientV3(cfg clientv3.Config) (*clientv3.Client, error) {
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c, err := clientv3.New(cfg)
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if err != nil {
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return nil, err
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}
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rpc := ToGRPC(c)
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c.KV = clientv3.NewKVFromKVClient(rpc.KV, c)
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pmu.Lock()
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lc := c.Lease
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c.Lease = clientv3.NewLeaseFromLeaseClient(rpc.Lease, c, cfg.DialTimeout)
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c.Watcher = &proxyCloser{
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Watcher: clientv3.NewWatchFromWatchClient(rpc.Watch, c),
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wdonec: proxies[c].wdonec,
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kvdonec: proxies[c].kvdonec,
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lclose: func() { lc.Close() },
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lpdonec: proxies[c].lpdonec,
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proxyCtxCancel: proxies[c].ctxCancel,
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}
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pmu.Unlock()
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return c, nil
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}
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