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// 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 etcdmain
import (
"fmt"
"os"
"go.etcd.io/etcd/client/pkg/v3/srv"
"go.etcd.io/etcd/client/pkg/v3/transport"
"go.uber.org/zap"
)
func discoverEndpoints(lg *zap.Logger, dns string, ca string, insecure bool, serviceName string) (s srv.SRVClients) {
if dns == "" {
return s
}
srvs, err := srv.GetClient("etcd-client", dns, serviceName)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
endpoints := srvs.Endpoints
if lg != nil {
lg.Info(
"discovered cluster from SRV",
zap.String("srv-server", dns),
zap.Strings("endpoints", endpoints),
)
}
if insecure {
return *srvs
}
// confirm TLS connections are good
tlsInfo := transport.TLSInfo{
TrustedCAFile: ca,
ServerName: dns,
}
if lg != nil {
lg.Info(
"validating discovered SRV endpoints",
zap.String("srv-server", dns),
zap.Strings("endpoints", endpoints),
)
}
endpoints, err = transport.ValidateSecureEndpoints(tlsInfo, endpoints)
if err != nil {
if lg != nil {
lg.Warn(
"failed to validate discovered endpoints",
zap.String("srv-server", dns),
zap.Strings("endpoints", endpoints),
zap.Error(err),
)
}
} else {
if lg != nil {
lg.Info(
"using validated discovered SRV endpoints",
zap.String("srv-server", dns),
zap.Strings("endpoints", endpoints),
)
}
}
// map endpoints back to SRVClients struct with SRV data
eps := make(map[string]struct{})
for _, ep := range endpoints {
eps[ep] = struct{}{}
}
for i := range srvs.Endpoints {
if _, ok := eps[srvs.Endpoints[i]]; !ok {
continue
}
s.Endpoints = append(s.Endpoints, srvs.Endpoints[i])
s.SRVs = append(s.SRVs, srvs.SRVs[i])
}
return s
}
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