107 lines
2.5 KiB
Go
107 lines
2.5 KiB
Go
// Copyright 2017 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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package etcdmain
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import (
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"fmt"
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"os"
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"go.etcd.io/etcd/pkg/srv"
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"go.etcd.io/etcd/pkg/transport"
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"go.uber.org/zap"
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)
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func discoverEndpoints(lg *zap.Logger, dns string, ca string, insecure bool, serviceName string) (s srv.SRVClients) {
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if dns == "" {
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return s
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}
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srvs, err := srv.GetClient("etcd-client", dns, serviceName)
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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endpoints := srvs.Endpoints
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if lg != nil {
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lg.Info(
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"discovered cluster from SRV",
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zap.String("srv-server", dns),
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zap.Strings("endpoints", endpoints),
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)
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} else {
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plog.Infof("discovered the cluster %s from %s", endpoints, dns)
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}
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if insecure {
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return *srvs
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}
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// confirm TLS connections are good
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tlsInfo := transport.TLSInfo{
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TrustedCAFile: ca,
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ServerName: dns,
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}
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if lg != nil {
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lg.Info(
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"validating discovered SRV endpoints",
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zap.String("srv-server", dns),
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zap.Strings("endpoints", endpoints),
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)
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} else {
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plog.Infof("validating discovered endpoints %v", endpoints)
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}
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endpoints, err = transport.ValidateSecureEndpoints(tlsInfo, endpoints)
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if err != nil {
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if lg != nil {
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lg.Warn(
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"failed to validate discovered endpoints",
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zap.String("srv-server", dns),
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zap.Strings("endpoints", endpoints),
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zap.Error(err),
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)
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} else {
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plog.Warningf("%v", err)
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}
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} else {
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if lg != nil {
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lg.Info(
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"using validated discovered SRV endpoints",
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zap.String("srv-server", dns),
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zap.Strings("endpoints", endpoints),
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)
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}
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}
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if lg == nil {
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plog.Infof("using discovered endpoints %v", endpoints)
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}
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// map endpoints back to SRVClients struct with SRV data
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eps := make(map[string]struct{})
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for _, ep := range endpoints {
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eps[ep] = struct{}{}
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}
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for i := range srvs.Endpoints {
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if _, ok := eps[srvs.Endpoints[i]]; !ok {
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continue
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}
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s.Endpoints = append(s.Endpoints, srvs.Endpoints[i])
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s.SRVs = append(s.SRVs, srvs.SRVs[i])
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}
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return s
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}
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