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