mirror of
https://github.com/etcd-io/etcd.git
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etcdserver: move remote cluster retrive to cluster_util.go
This commit is contained in:
Xiang Li
parent
4a0887ef7a
commit
20497f1f85
112
etcdserver/cluster_util.go
Normal file
112
etcdserver/cluster_util.go
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@ -0,0 +1,112 @@
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// Copyright 2015 CoreOS, 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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package etcdserver
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"sort"
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"time"
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"github.com/coreos/etcd/pkg/types"
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)
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// isBootstrapped tries to check if the given member has been bootstrapped
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// in the given cluster.
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func isBootstrapped(cfg *ServerConfig) bool {
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cl := cfg.Cluster
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member := cfg.Name
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us := getOtherPeerURLs(cl, member)
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rcl, err := getClusterFromPeers(us, false, cfg.Transport)
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if err != nil {
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return false
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}
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id := cl.MemberByName(member).ID
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m := rcl.Member(id)
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if m == nil {
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return false
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}
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if len(m.ClientURLs) > 0 {
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return true
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}
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return false
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}
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// GetClusterFromPeers takes a set of URLs representing etcd peers, and
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// attempts to construct a Cluster by accessing the members endpoint on one of
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// these URLs. The first URL to provide a response is used. If no URLs provide
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// a response, or a Cluster cannot be successfully created from a received
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// response, an error is returned.
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func GetClusterFromPeers(urls []string, tr *http.Transport) (*Cluster, error) {
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return getClusterFromPeers(urls, true, tr)
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}
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// If logerr is true, it prints out more error messages.
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func getClusterFromPeers(urls []string, logerr bool, tr *http.Transport) (*Cluster, error) {
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cc := &http.Client{
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Transport: tr,
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Timeout: time.Second,
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}
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for _, u := range urls {
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resp, err := cc.Get(u + "/members")
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not get cluster response from %s: %v", u, err)
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}
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continue
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}
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not read the body of cluster response: %v", err)
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}
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continue
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}
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var membs []*Member
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if err := json.Unmarshal(b, &membs); err != nil {
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if logerr {
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log.Printf("etcdserver: could not unmarshal cluster response: %v", err)
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}
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continue
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}
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id, err := types.IDFromString(resp.Header.Get("X-Etcd-Cluster-ID"))
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not parse the cluster ID from cluster res: %v", err)
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}
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continue
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}
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return NewClusterFromMembers("", id, membs), nil
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}
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return nil, fmt.Errorf("etcdserver: could not retrieve cluster information from the given urls")
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}
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// getOtherPeerURLs returns peer urls of other members in the cluster. The
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// returned list is sorted in ascending lexicographical order.
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func getOtherPeerURLs(cl ClusterInfo, self string) []string {
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us := make([]string, 0)
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for _, m := range cl.Members() {
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if m.Name == self {
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continue
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}
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us = append(us, m.PeerURLs...)
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}
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sort.Strings(us)
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return us
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}
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@ -18,13 +18,11 @@ import (
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"encoding/json"
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"expvar"
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"fmt"
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"io/ioutil"
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"log"
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"math/rand"
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"net/http"
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"path"
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"regexp"
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"sort"
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"sync/atomic"
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"time"
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@ -821,88 +819,3 @@ func (s *EtcdServer) snapshot(snapi uint64, confState *raftpb.ConfState) {
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func (s *EtcdServer) PauseSending() { s.r.pauseSending() }
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func (s *EtcdServer) ResumeSending() { s.r.resumeSending() }
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// isBootstrapped tries to check if the given member has been bootstrapped
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// in the given cluster.
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func isBootstrapped(cfg *ServerConfig) bool {
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cl := cfg.Cluster
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member := cfg.Name
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us := getOtherPeerURLs(cl, member)
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rcl, err := getClusterFromPeers(us, false, cfg.Transport)
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if err != nil {
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return false
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}
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id := cl.MemberByName(member).ID
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m := rcl.Member(id)
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if m == nil {
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return false
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}
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if len(m.ClientURLs) > 0 {
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return true
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}
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return false
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}
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// GetClusterFromPeers takes a set of URLs representing etcd peers, and
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// attempts to construct a Cluster by accessing the members endpoint on one of
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// these URLs. The first URL to provide a response is used. If no URLs provide
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// a response, or a Cluster cannot be successfully created from a received
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// response, an error is returned.
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func GetClusterFromPeers(urls []string, tr *http.Transport) (*Cluster, error) {
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return getClusterFromPeers(urls, true, tr)
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}
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// If logerr is true, it prints out more error messages.
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func getClusterFromPeers(urls []string, logerr bool, tr *http.Transport) (*Cluster, error) {
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cc := &http.Client{
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Transport: tr,
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Timeout: time.Second,
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}
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for _, u := range urls {
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resp, err := cc.Get(u + "/members")
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not get cluster response from %s: %v", u, err)
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}
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continue
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}
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not read the body of cluster response: %v", err)
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}
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continue
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}
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var membs []*Member
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if err := json.Unmarshal(b, &membs); err != nil {
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if logerr {
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log.Printf("etcdserver: could not unmarshal cluster response: %v", err)
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}
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continue
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}
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id, err := types.IDFromString(resp.Header.Get("X-Etcd-Cluster-ID"))
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not parse the cluster ID from cluster res: %v", err)
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}
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continue
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}
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return NewClusterFromMembers("", id, membs), nil
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}
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return nil, fmt.Errorf("etcdserver: could not retrieve cluster information from the given urls")
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}
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// getOtherPeerURLs returns peer urls of other members in the cluster. The
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// returned list is sorted in ascending lexicographical order.
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func getOtherPeerURLs(cl ClusterInfo, self string) []string {
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us := make([]string, 0)
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for _, m := range cl.Members() {
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if m.Name == self {
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continue
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}
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us = append(us, m.PeerURLs...)
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}
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sort.Strings(us)
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return us
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}
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