2013-12-09 21:34:05 +00:00
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package weed_server
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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2014-02-05 08:25:23 +00:00
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"io/ioutil"
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2014-04-11 23:23:58 +00:00
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"math/rand"
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2013-12-09 21:34:05 +00:00
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"net/http"
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"net/url"
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2014-10-27 08:09:45 +00:00
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"os"
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"path"
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2016-05-24 17:45:28 +00:00
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"reflect"
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"sort"
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2013-12-09 21:34:05 +00:00
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"strings"
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"time"
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2014-10-26 18:34:55 +00:00
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2015-05-03 19:37:49 +00:00
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"github.com/chrislusf/raft"
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2016-06-03 01:09:14 +00:00
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/topology"
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2014-10-26 18:34:55 +00:00
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"github.com/gorilla/mux"
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2013-12-09 21:34:05 +00:00
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)
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type RaftServer struct {
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peers []string // initial peers to join with
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raftServer raft.Server
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dataDir string
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httpAddr string
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router *mux.Router
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2014-03-16 06:03:49 +00:00
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topo *topology.Topology
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2013-12-09 21:34:05 +00:00
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}
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2014-03-25 20:46:59 +00:00
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func NewRaftServer(r *mux.Router, peers []string, httpAddr string, dataDir string, topo *topology.Topology, pulseSeconds int) *RaftServer {
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2013-12-09 21:34:05 +00:00
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s := &RaftServer{
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peers: peers,
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httpAddr: httpAddr,
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dataDir: dataDir,
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router: r,
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2014-03-16 06:03:49 +00:00
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topo: topo,
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2013-12-09 21:34:05 +00:00
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}
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2014-02-04 09:11:28 +00:00
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if glog.V(4) {
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raft.SetLogLevel(2)
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}
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2013-12-09 21:34:05 +00:00
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2014-03-16 06:03:49 +00:00
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raft.RegisterCommand(&topology.MaxVolumeIdCommand{})
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2013-12-09 21:34:05 +00:00
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var err error
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2014-04-16 00:56:47 +00:00
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transporter := raft.NewHTTPTransporter("/cluster", 0)
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2014-03-16 20:49:49 +00:00
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transporter.Transport.MaxIdleConnsPerHost = 1024
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2014-10-20 03:03:00 +00:00
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glog.V(1).Infof("Starting RaftServer with IP:%v:", httpAddr)
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2014-03-16 20:49:49 +00:00
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2016-05-24 17:45:28 +00:00
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// Clear old cluster configurations if peers are changed
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if oldPeers, changed := isPeersChanged(s.dataDir, httpAddr, s.peers); changed {
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glog.V(0).Infof("Peers Change: %v => %v", oldPeers, s.peers)
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2014-10-27 08:09:45 +00:00
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os.RemoveAll(path.Join(s.dataDir, "conf"))
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os.RemoveAll(path.Join(s.dataDir, "log"))
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os.RemoveAll(path.Join(s.dataDir, "snapshot"))
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}
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2014-03-16 06:03:49 +00:00
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s.raftServer, err = raft.NewServer(s.httpAddr, s.dataDir, transporter, nil, topo, "")
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2013-12-09 21:34:05 +00:00
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if err != nil {
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glog.V(0).Infoln(err)
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return nil
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}
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transporter.Install(s.raftServer, s)
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2014-01-28 19:15:24 +00:00
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s.raftServer.SetHeartbeatInterval(1 * time.Second)
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2014-10-27 08:09:45 +00:00
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s.raftServer.SetElectionTimeout(time.Duration(pulseSeconds) * 3450 * time.Millisecond)
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2013-12-09 21:34:05 +00:00
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s.raftServer.Start()
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2014-02-04 09:10:07 +00:00
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s.router.HandleFunc("/cluster/join", s.joinHandler).Methods("POST")
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2014-02-04 09:11:28 +00:00
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s.router.HandleFunc("/cluster/status", s.statusHandler).Methods("GET")
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2013-12-09 21:34:05 +00:00
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if len(s.peers) > 0 {
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2014-10-27 08:09:45 +00:00
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// Join to leader if specified.
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2016-05-24 17:45:28 +00:00
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for {
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glog.V(0).Infoln("Joining cluster:", strings.Join(s.peers, ","))
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time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
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firstJoinError := s.Join(s.peers)
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if firstJoinError != nil {
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glog.V(0).Infoln("No existing server found. Starting as leader in the new cluster.")
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_, err := s.raftServer.Do(&raft.DefaultJoinCommand{
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Name: s.raftServer.Name(),
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ConnectionString: "http://" + s.httpAddr,
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})
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if err != nil {
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glog.V(0).Infoln(err)
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} else {
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break
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}
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} else {
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break
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2014-04-11 23:23:58 +00:00
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}
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2013-12-09 21:34:05 +00:00
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}
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} else if s.raftServer.IsLogEmpty() {
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2014-10-27 08:09:45 +00:00
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// Initialize the server by joining itself.
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2013-12-09 21:34:05 +00:00
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glog.V(0).Infoln("Initializing new cluster")
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_, err := s.raftServer.Do(&raft.DefaultJoinCommand{
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Name: s.raftServer.Name(),
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ConnectionString: "http://" + s.httpAddr,
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})
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if err != nil {
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glog.V(0).Infoln(err)
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return nil
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}
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} else {
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2014-10-27 08:09:45 +00:00
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glog.V(0).Infoln("Old conf,log,snapshot should have been removed.")
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2013-12-09 21:34:05 +00:00
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}
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return s
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}
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2014-02-05 08:25:23 +00:00
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func (s *RaftServer) Peers() (members []string) {
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2013-12-09 21:34:05 +00:00
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peers := s.raftServer.Peers()
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for _, p := range peers {
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members = append(members, strings.TrimPrefix(p.ConnectionString, "http://"))
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}
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return
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}
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2016-05-24 17:45:28 +00:00
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func isPeersChanged(dir string, self string, peers []string) (oldPeers []string, changed bool) {
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confPath := path.Join(dir, "conf")
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// open conf file
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b, err := ioutil.ReadFile(confPath)
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if err != nil {
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return oldPeers, true
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}
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conf := &raft.Config{}
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if err = json.Unmarshal(b, conf); err != nil {
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return oldPeers, true
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}
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for _, p := range conf.Peers {
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oldPeers = append(oldPeers, strings.TrimPrefix(p.ConnectionString, "http://"))
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}
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oldPeers = append(oldPeers, self)
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sort.Strings(peers)
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sort.Strings(oldPeers)
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2016-11-03 07:46:59 +00:00
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return oldPeers, !reflect.DeepEqual(peers, oldPeers)
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2016-05-24 17:45:28 +00:00
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}
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2013-12-09 21:34:05 +00:00
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// Join joins an existing cluster.
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func (s *RaftServer) Join(peers []string) error {
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command := &raft.DefaultJoinCommand{
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Name: s.raftServer.Name(),
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ConnectionString: "http://" + s.httpAddr,
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}
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2014-04-17 06:43:27 +00:00
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var err error
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2013-12-09 21:34:05 +00:00
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var b bytes.Buffer
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json.NewEncoder(&b).Encode(command)
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for _, m := range peers {
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2014-04-17 06:43:27 +00:00
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if m == s.httpAddr {
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continue
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}
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2014-02-05 08:25:23 +00:00
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target := fmt.Sprintf("http://%s/cluster/join", strings.TrimSpace(m))
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glog.V(0).Infoln("Attempting to connect to:", target)
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2013-12-09 21:34:05 +00:00
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2014-04-17 06:43:27 +00:00
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err = postFollowingOneRedirect(target, "application/json", &b)
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2013-12-09 21:34:05 +00:00
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if err != nil {
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2014-03-12 13:23:07 +00:00
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glog.V(0).Infoln("Post returned error: ", err.Error())
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2013-12-09 21:34:05 +00:00
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if _, ok := err.(*url.Error); ok {
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// If we receive a network error try the next member
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continue
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}
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2014-04-17 06:43:27 +00:00
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} else {
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return nil
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2013-12-09 21:34:05 +00:00
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}
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}
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return errors.New("Could not connect to any cluster peers")
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}
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2014-02-05 08:25:23 +00:00
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// a workaround because http POST following redirection misses request body
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func postFollowingOneRedirect(target string, contentType string, b *bytes.Buffer) error {
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backupReader := bytes.NewReader(b.Bytes())
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resp, err := http.Post(target, contentType, b)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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reply, _ := ioutil.ReadAll(resp.Body)
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statusCode := resp.StatusCode
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if statusCode == http.StatusMovedPermanently {
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var urlStr string
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if urlStr = resp.Header.Get("Location"); urlStr == "" {
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2015-03-10 07:20:31 +00:00
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return fmt.Errorf("%d response missing Location header", resp.StatusCode)
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2014-02-05 08:25:23 +00:00
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}
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glog.V(0).Infoln("Post redirected to ", urlStr)
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resp2, err2 := http.Post(urlStr, contentType, backupReader)
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if err2 != nil {
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return err2
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}
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defer resp2.Body.Close()
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reply, _ = ioutil.ReadAll(resp2.Body)
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statusCode = resp2.StatusCode
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}
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glog.V(0).Infoln("Post returned status: ", statusCode, string(reply))
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if statusCode != http.StatusOK {
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return errors.New(string(reply))
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}
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return nil
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}
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