| // Copyright 2017 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. |
| |
| // Package naming provides an etcd-backed gRPC resolver for discovering gRPC services. |
| // |
| // To use, first import the packages: |
| // |
| // import ( |
| // "github.com/coreos/etcd/clientv3" |
| // etcdnaming "github.com/coreos/etcd/clientv3/naming" |
| // |
| // "google.golang.org/grpc" |
| // "google.golang.org/grpc/naming" |
| // ) |
| // |
| // First, register new endpoint addresses for a service: |
| // |
| // func etcdAdd(c *clientv3.Client, service, addr string) error { |
| // r := &etcdnaming.GRPCResolver{Client: c} |
| // return r.Update(c.Ctx(), service, naming.Update{Op: naming.Add, Addr: addr}) |
| // } |
| // |
| // Dial an RPC service using the etcd gRPC resolver and a gRPC Balancer: |
| // |
| // func etcdDial(c *clientv3.Client, service string) (*grpc.ClientConn, error) { |
| // r := &etcdnaming.GRPCResolver{Client: c} |
| // b := grpc.RoundRobin(r) |
| // return grpc.Dial(service, grpc.WithBalancer(b)) |
| // } |
| // |
| // Optionally, force delete an endpoint: |
| // |
| // func etcdDelete(c *clientv3, service, addr string) error { |
| // r := &etcdnaming.GRPCResolver{Client: c} |
| // return r.Update(c.Ctx(), "my-service", naming.Update{Op: naming.Delete, Addr: "1.2.3.4"}) |
| // } |
| // |
| // Or register an expiring endpoint with a lease: |
| // |
| // func etcdLeaseAdd(c *clientv3.Client, lid clientv3.LeaseID, service, addr string) error { |
| // r := &etcdnaming.GRPCResolver{Client: c} |
| // return r.Update(c.Ctx(), service, naming.Update{Op: naming.Add, Addr: addr}, clientv3.WithLease(lid)) |
| // } |
| // |
| package naming |