package weed_server import ( "code.google.com/p/weed-fs/go/glog" "code.google.com/p/weed-fs/go/sequence" "code.google.com/p/weed-fs/go/topology" "code.google.com/p/weed-fs/go/util" "errors" "github.com/goraft/raft" "github.com/gorilla/mux" "net/http" "net/http/httputil" "net/url" "sync" ) type MasterServer struct { port int metaFolder string volumeSizeLimitMB uint pulseSeconds int defaultReplicaPlacement string garbageThreshold string whiteList []string Topo *topology.Topology vg *topology.VolumeGrowth vgLock sync.Mutex bounedLeaderChan chan int } func NewMasterServer(r *mux.Router, port int, metaFolder string, volumeSizeLimitMB uint, pulseSeconds int, confFile string, defaultReplicaPlacement string, garbageThreshold string, whiteList []string, ) *MasterServer { ms := &MasterServer{ port: port, volumeSizeLimitMB: volumeSizeLimitMB, pulseSeconds: pulseSeconds, defaultReplicaPlacement: defaultReplicaPlacement, garbageThreshold: garbageThreshold, whiteList: whiteList, } ms.bounedLeaderChan = make(chan int, 16) seq := sequence.NewMemorySequencer() var e error if ms.Topo, e = topology.NewTopology("topo", confFile, seq, uint64(volumeSizeLimitMB)*1024*1024, pulseSeconds); e != nil { glog.Fatalf("cannot create topology:%s", e) } ms.vg = topology.NewDefaultVolumeGrowth() glog.V(0).Infoln("Volume Size Limit is", volumeSizeLimitMB, "MB") r.HandleFunc("/dir/assign", ms.proxyToLeader(secure(ms.whiteList, ms.dirAssignHandler))) r.HandleFunc("/dir/lookup", ms.proxyToLeader(secure(ms.whiteList, ms.dirLookupHandler))) r.HandleFunc("/dir/join", ms.proxyToLeader(secure(ms.whiteList, ms.dirJoinHandler))) r.HandleFunc("/dir/status", ms.proxyToLeader(secure(ms.whiteList, ms.dirStatusHandler))) r.HandleFunc("/col/delete", ms.proxyToLeader(secure(ms.whiteList, ms.collectionDeleteHandler))) r.HandleFunc("/vol/lookup", ms.proxyToLeader(secure(ms.whiteList, ms.volumeLookupHandler))) r.HandleFunc("/vol/grow", ms.proxyToLeader(secure(ms.whiteList, ms.volumeGrowHandler))) r.HandleFunc("/vol/status", ms.proxyToLeader(secure(ms.whiteList, ms.volumeStatusHandler))) r.HandleFunc("/vol/vacuum", ms.proxyToLeader(secure(ms.whiteList, ms.volumeVacuumHandler))) r.HandleFunc("/submit", secure(ms.whiteList, ms.submitFromMasterServerHandler)) r.HandleFunc("/delete", secure(ms.whiteList, ms.deleteFromMasterServerHandler)) r.HandleFunc("/{fileId}", ms.redirectHandler) r.HandleFunc("/stats/counter", secure(ms.whiteList, statsCounterHandler)) r.HandleFunc("/stats/memory", secure(ms.whiteList, statsMemoryHandler)) ms.Topo.StartRefreshWritableVolumes(garbageThreshold) return ms } func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) { ms.Topo.RaftServer = raftServer.raftServer ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) { if ms.Topo.RaftServer.Leader() != "" { glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.") } }) if ms.Topo.IsLeader() { glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", "I am the leader!") } else { if ms.Topo.RaftServer.Leader() != "" { glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "is the leader.") } } } func (ms *MasterServer) proxyToLeader(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) { return func(w http.ResponseWriter, r *http.Request) { if ms.Topo.IsLeader() { f(w, r) } else if ms.Topo.RaftServer != nil && ms.Topo.RaftServer.Leader() != "" { ms.bounedLeaderChan <- 1 defer func() { <-ms.bounedLeaderChan }() targetUrl, err := url.Parse("http://" + ms.Topo.RaftServer.Leader()) if err != nil { writeJsonQuiet(w, r, map[string]interface{}{"error": "Leader URL http://" + ms.Topo.RaftServer.Leader() + " Parse Error " + err.Error()}) return } glog.V(4).Infoln("proxying to leader", ms.Topo.RaftServer.Leader()) proxy := httputil.NewSingleHostReverseProxy(targetUrl) proxy.Transport = util.Transport proxy.ServeHTTP(w, r) } else { //drop it to the floor writeJsonError(w, r, errors.New(ms.Topo.RaftServer.Name()+" does not know Leader yet:"+ms.Topo.RaftServer.Leader())) } } }