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// Copyright 2016 The etcd 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.
//go:build cluster_proxy
// +build cluster_proxy
package integration
import (
"context"
"sync"
"go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/namespace"
"go.etcd.io/etcd/server/v3/proxy/grpcproxy"
"go.etcd.io/etcd/server/v3/proxy/grpcproxy/adapter"
"go.uber.org/zap"
)
const ThroughProxy = true
var (
pmu sync.Mutex
proxies map[*clientv3.Client]grpcClientProxy = make(map[*clientv3.Client]grpcClientProxy)
)
const proxyNamespace = "proxy-namespace"
type grpcClientProxy struct {
ctx context.Context
ctxCancel func()
grpc grpcAPI
wdonec <-chan struct{}
kvdonec <-chan struct{}
lpdonec <-chan struct{}
}
func toGRPC(c *clientv3.Client) grpcAPI {
pmu.Lock()
defer pmu.Unlock()
// dedicated context bound to 'grpc-proxy' lifetype
// (so in practice lifetime of the client connection to the proxy).
// TODO: Refactor to a separate clientv3.Client instance instead of the context alone.
ctx, ctxCancel := context.WithCancel(context.WithValue(context.TODO(), "_name", "grpcProxyContext"))
lg := c.GetLogger()
if v, ok := proxies[c]; ok {
return v.grpc
}
// test namespacing proxy
c.KV = namespace.NewKV(c.KV, proxyNamespace)
c.Watcher = namespace.NewWatcher(c.Watcher, proxyNamespace)
c.Lease = namespace.NewLease(c.Lease, proxyNamespace)
// test coalescing/caching proxy
kvp, kvpch := grpcproxy.NewKvProxy(c)
wp, wpch := grpcproxy.NewWatchProxy(ctx, lg, c)
lp, lpch := grpcproxy.NewLeaseProxy(ctx, c)
mp := grpcproxy.NewMaintenanceProxy(c)
clp, _ := grpcproxy.NewClusterProxy(lg, c, "", "") // without registering proxy URLs
authp := grpcproxy.NewAuthProxy(c)
lockp := grpcproxy.NewLockProxy(c)
electp := grpcproxy.NewElectionProxy(c)
grpc := grpcAPI{
adapter.ClusterServerToClusterClient(clp),
adapter.KvServerToKvClient(kvp),
adapter.LeaseServerToLeaseClient(lp),
adapter.WatchServerToWatchClient(wp),
adapter.MaintenanceServerToMaintenanceClient(mp),
adapter.AuthServerToAuthClient(authp),
adapter.LockServerToLockClient(lockp),
adapter.ElectionServerToElectionClient(electp),
}
proxies[c] = grpcClientProxy{ctx: ctx, ctxCancel: ctxCancel, grpc: grpc, wdonec: wpch, kvdonec: kvpch, lpdonec: lpch}
return grpc
}
type proxyCloser struct {
clientv3.Watcher
proxyCtxCancel func()
wdonec <-chan struct{}
kvdonec <-chan struct{}
lclose func()
lpdonec <-chan struct{}
}
func (pc *proxyCloser) Close() error {
pc.proxyCtxCancel()
<-pc.kvdonec
err := pc.Watcher.Close()
<-pc.wdonec
pc.lclose()
<-pc.lpdonec
return err
}
func newClientV3(cfg clientv3.Config, lg *zap.Logger) (*clientv3.Client, error) {
cfg.Logger = lg
c, err := clientv3.New(cfg)
if err != nil {
return nil, err
}
rpc := toGRPC(c)
c.KV = clientv3.NewKVFromKVClient(rpc.KV, c)
pmu.Lock()
lc := c.Lease
c.Lease = clientv3.NewLeaseFromLeaseClient(rpc.Lease, c, cfg.DialTimeout)
c.Watcher = &proxyCloser{
Watcher: clientv3.NewWatchFromWatchClient(rpc.Watch, c),
wdonec: proxies[c].wdonec,
kvdonec: proxies[c].kvdonec,
lclose: func() { lc.Close() },
lpdonec: proxies[c].lpdonec,
proxyCtxCancel: proxies[c].ctxCancel,
}
pmu.Unlock()
return c, nil
}
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