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Copy pathetcd.go
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167 lines (150 loc) · 4.44 KB
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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* 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 etcd
import (
"crypto/tls"
"crypto/x509"
"strings"
"time"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/pkg/env"
xnet "github.com/minio/minio/pkg/net"
"go.etcd.io/etcd/v3/clientv3"
"go.etcd.io/etcd/v3/clientv3/namespace"
)
const (
// Default values used while communicating with etcd.
defaultDialTimeout = 5 * time.Second
defaultDialKeepAlive = 30 * time.Second
)
// etcd environment values
const (
Endpoints = "endpoints"
PathPrefix = "path_prefix"
CoreDNSPath = "coredns_path"
ClientCert = "client_cert"
ClientCertKey = "client_cert_key"
EnvEtcdEndpoints = "MINIO_ETCD_ENDPOINTS"
EnvEtcdPathPrefix = "MINIO_ETCD_PATH_PREFIX"
EnvEtcdCoreDNSPath = "MINIO_ETCD_COREDNS_PATH"
EnvEtcdClientCert = "MINIO_ETCD_CLIENT_CERT"
EnvEtcdClientCertKey = "MINIO_ETCD_CLIENT_CERT_KEY"
)
// DefaultKVS - default KV settings for etcd.
var (
DefaultKVS = config.KVS{
config.KV{
Key: Endpoints,
Value: "",
},
config.KV{
Key: PathPrefix,
Value: "",
},
config.KV{
Key: CoreDNSPath,
Value: "/skydns",
},
config.KV{
Key: ClientCert,
Value: "",
},
config.KV{
Key: ClientCertKey,
Value: "",
},
}
)
// Config - server etcd config.
type Config struct {
Enabled bool `json:"enabled"`
PathPrefix string `json:"pathPrefix"`
CoreDNSPath string `json:"coreDNSPath"`
clientv3.Config
}
// New - initialize new etcd client.
func New(cfg Config) (*clientv3.Client, error) {
if !cfg.Enabled {
return nil, nil
}
cli, err := clientv3.New(cfg.Config)
if err != nil {
return nil, err
}
cli.KV = namespace.NewKV(cli.KV, cfg.PathPrefix)
cli.Watcher = namespace.NewWatcher(cli.Watcher, cfg.PathPrefix)
cli.Lease = namespace.NewLease(cli.Lease, cfg.PathPrefix)
return cli, nil
}
func parseEndpoints(endpoints string) ([]string, bool, error) {
etcdEndpoints := strings.Split(endpoints, config.ValueSeparator)
var etcdSecure bool
for _, endpoint := range etcdEndpoints {
u, err := xnet.ParseHTTPURL(endpoint)
if err != nil {
return nil, false, err
}
if etcdSecure && u.Scheme == "http" {
return nil, false, config.Errorf("all endpoints should be https or http: %s", endpoint)
}
// If one of the endpoint is https, we will use https directly.
etcdSecure = etcdSecure || u.Scheme == "https"
}
return etcdEndpoints, etcdSecure, nil
}
// Enabled returns if etcd is enabled.
func Enabled(kvs config.KVS) bool {
endpoints := kvs.Get(Endpoints)
return endpoints != ""
}
// LookupConfig - Initialize new etcd config.
func LookupConfig(kvs config.KVS, rootCAs *x509.CertPool) (Config, error) {
cfg := Config{}
if err := config.CheckValidKeys(config.EtcdSubSys, kvs, DefaultKVS); err != nil {
return cfg, err
}
endpoints := env.Get(EnvEtcdEndpoints, kvs.Get(Endpoints))
if endpoints == "" {
return cfg, nil
}
etcdEndpoints, etcdSecure, err := parseEndpoints(endpoints)
if err != nil {
return cfg, err
}
cfg.Enabled = true
cfg.DialTimeout = defaultDialTimeout
cfg.DialKeepAliveTime = defaultDialKeepAlive
cfg.Endpoints = etcdEndpoints
cfg.CoreDNSPath = env.Get(EnvEtcdCoreDNSPath, kvs.Get(CoreDNSPath))
// Default path prefix for all keys on etcd, other than CoreDNSPath.
cfg.PathPrefix = env.Get(EnvEtcdPathPrefix, kvs.Get(PathPrefix))
if etcdSecure {
cfg.TLS = &tls.Config{
RootCAs: rootCAs,
}
// This is only to support client side certificate authentication
// https://coreos.com/etcd/docs/latest/op-guide/security.html
etcdClientCertFile := env.Get(EnvEtcdClientCert, kvs.Get(ClientCert))
etcdClientCertKey := env.Get(EnvEtcdClientCertKey, kvs.Get(ClientCertKey))
if etcdClientCertFile != "" && etcdClientCertKey != "" {
cfg.TLS.GetClientCertificate = func(unused *tls.CertificateRequestInfo) (*tls.Certificate, error) {
cert, err := tls.LoadX509KeyPair(etcdClientCertFile, etcdClientCertKey)
return &cert, err
}
}
}
return cfg, nil
}