124 lines
3.5 KiB
Go
124 lines
3.5 KiB
Go
// 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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"strconv"
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"time"
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"github.com/coreos/etcd/pkg/types"
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)
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// isMemberBootstrapped tries to check if the given member has been bootstrapped
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// in the given cluster.
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func isMemberBootstrapped(cl *Cluster, member string, tr *http.Transport) bool {
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rcl, err := getClusterFromRemotePeers(getRemotePeerURLs(cl, member), false, tr)
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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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// GetClusterFromRemotePeers 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 GetClusterFromRemotePeers(urls []string, tr *http.Transport) (*Cluster, error) {
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return getClusterFromRemotePeers(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 getClusterFromRemotePeers(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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var index uint64
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// The header at or before v2.0.3 doesn't have this field. For backward
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// compatibility, it checks whether the field exists.
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if indexStr := resp.Header.Get("X-Raft-Index"); indexStr != "" {
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index, err = strconv.ParseUint(indexStr, 10, 64)
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if err != nil {
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if logerr {
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log.Printf("etcdserver: could not parse raft index: %v", err)
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}
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continue
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}
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}
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cl := NewClusterFromMembers("", id, membs)
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cl.UpdateIndex(index)
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return cl, 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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// getRemotePeerURLs returns peer urls of remote members in the cluster. The
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// returned list is sorted in ascending lexicographical order.
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func getRemotePeerURLs(cl ClusterInfo, local 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 == local {
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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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