khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // Copyright 2017 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package etcdmain |
| 16 | |
| 17 | import ( |
| 18 | "fmt" |
| 19 | "os" |
| 20 | |
| 21 | "github.com/coreos/etcd/pkg/srv" |
| 22 | "github.com/coreos/etcd/pkg/transport" |
| 23 | ) |
| 24 | |
| 25 | func discoverEndpoints(dns string, ca string, insecure bool) (s srv.SRVClients) { |
| 26 | if dns == "" { |
| 27 | return s |
| 28 | } |
| 29 | srvs, err := srv.GetClient("etcd-client", dns) |
| 30 | if err != nil { |
| 31 | fmt.Fprintln(os.Stderr, err) |
| 32 | os.Exit(1) |
| 33 | } |
| 34 | endpoints := srvs.Endpoints |
| 35 | plog.Infof("discovered the cluster %s from %s", endpoints, dns) |
| 36 | if insecure { |
| 37 | return *srvs |
| 38 | } |
| 39 | // confirm TLS connections are good |
| 40 | tlsInfo := transport.TLSInfo{ |
| 41 | TrustedCAFile: ca, |
| 42 | ServerName: dns, |
| 43 | } |
| 44 | plog.Infof("validating discovered endpoints %v", endpoints) |
| 45 | endpoints, err = transport.ValidateSecureEndpoints(tlsInfo, endpoints) |
| 46 | if err != nil { |
| 47 | plog.Warningf("%v", err) |
| 48 | } |
| 49 | plog.Infof("using discovered endpoints %v", endpoints) |
| 50 | |
| 51 | // map endpoints back to SRVClients struct with SRV data |
| 52 | eps := make(map[string]struct{}) |
| 53 | for _, ep := range endpoints { |
| 54 | eps[ep] = struct{}{} |
| 55 | } |
| 56 | for i := range srvs.Endpoints { |
| 57 | if _, ok := eps[srvs.Endpoints[i]]; !ok { |
| 58 | continue |
| 59 | } |
| 60 | s.Endpoints = append(s.Endpoints, srvs.Endpoints[i]) |
| 61 | s.SRVs = append(s.SRVs, srvs.SRVs[i]) |
| 62 | } |
| 63 | |
| 64 | return s |
| 65 | } |