package weed_server import ( "fmt" "net/http" "net/http/httputil" "net/url" "sync" "github.com/chrislusf/raft" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/security" "github.com/chrislusf/seaweedfs/weed/sequence" "github.com/chrislusf/seaweedfs/weed/topology" "github.com/chrislusf/seaweedfs/weed/util" "github.com/gorilla/mux" ) type MasterServer struct { port int metaFolder string volumeSizeLimitMB uint preallocate int64 pulseSeconds int defaultReplicaPlacement string garbageThreshold string guard *security.Guard Topo *topology.Topology vg *topology.VolumeGrowth vgLock sync.Mutex bounedLeaderChan chan int } func NewMasterServer(r *mux.Router, port int, metaFolder string, volumeSizeLimitMB uint, preallocate bool, pulseSeconds int, confFile string, defaultReplicaPlacement string, garbageThreshold string, whiteList []string, secureKey string, ) *MasterServer { var preallocateSize int64 if preallocate { preallocateSize = int64(volumeSizeLimitMB) * (1 << 20) } ms := &MasterServer{ port: port, volumeSizeLimitMB: volumeSizeLimitMB, preallocate: preallocateSize, pulseSeconds: pulseSeconds, defaultReplicaPlacement: defaultReplicaPlacement, garbageThreshold: garbageThreshold, } 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") ms.guard = security.NewGuard(whiteList, secureKey) r.HandleFunc("/", ms.uiStatusHandler) r.HandleFunc("/ui/index.html", ms.uiStatusHandler) r.HandleFunc("/dir/assign", ms.proxyToLeader(ms.guard.WhiteList(ms.dirAssignHandler))) r.HandleFunc("/dir/lookup", ms.proxyToLeader(ms.guard.WhiteList(ms.dirLookupHandler))) r.HandleFunc("/dir/status", ms.proxyToLeader(ms.guard.WhiteList(ms.dirStatusHandler))) r.HandleFunc("/col/delete", ms.proxyToLeader(ms.guard.WhiteList(ms.collectionDeleteHandler))) r.HandleFunc("/vol/lookup", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeLookupHandler))) r.HandleFunc("/vol/grow", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeGrowHandler))) r.HandleFunc("/vol/status", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeStatusHandler))) r.HandleFunc("/vol/vacuum", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeVacuumHandler))) r.HandleFunc("/submit", ms.guard.WhiteList(ms.submitFromMasterServerHandler)) r.HandleFunc("/delete", ms.guard.WhiteList(ms.deleteFromMasterServerHandler)) r.HandleFunc("/{fileId}", ms.proxyToLeader(ms.redirectHandler)) r.HandleFunc("/stats/counter", ms.guard.WhiteList(statsCounterHandler)) r.HandleFunc("/stats/memory", ms.guard.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 { writeJsonError(w, r, http.StatusInternalServerError, fmt.Errorf("Leader URL http://%s Parse Error: %v", ms.Topo.RaftServer.Leader(), err)) return } glog.V(4).Infoln("proxying to leader", ms.Topo.RaftServer.Leader()) proxy := httputil.NewSingleHostReverseProxy(targetUrl) director := proxy.Director proxy.Director = func(req *http.Request) { actualHost, err := security.GetActualRemoteHost(req) if err == nil { req.Header.Set("HTTP_X_FORWARDED_FOR", actualHost) } director(req) } 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())) } } }