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41143b3b78
peers in order to avoid the same volume id being assigned twice 1. moving raft.Server to topology 2. adding max volume id command for raft
108 lines
3.7 KiB
Go
108 lines
3.7 KiB
Go
package weed_server
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import (
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"code.google.com/p/weed-fs/go/glog"
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"code.google.com/p/weed-fs/go/replication"
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"code.google.com/p/weed-fs/go/sequence"
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"code.google.com/p/weed-fs/go/topology"
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"code.google.com/p/weed-fs/go/util"
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"github.com/goraft/raft"
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"github.com/gorilla/mux"
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"net/http"
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"net/http/httputil"
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"net/url"
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"path"
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"sync"
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)
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type MasterServer struct {
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port int
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metaFolder string
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volumeSizeLimitMB uint
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pulseSeconds int
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defaultReplicaPlacement string
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garbageThreshold string
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whiteList []string
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version string
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Topo *topology.Topology
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vg *replication.VolumeGrowth
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vgLock sync.Mutex
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bounedLeaderChan chan int
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}
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func NewMasterServer(r *mux.Router, version string, port int, metaFolder string,
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volumeSizeLimitMB uint,
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pulseSeconds int,
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confFile string,
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defaultReplicaPlacement string,
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garbageThreshold string,
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whiteList []string,
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) *MasterServer {
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ms := &MasterServer{
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version: version,
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volumeSizeLimitMB: volumeSizeLimitMB,
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pulseSeconds: pulseSeconds,
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defaultReplicaPlacement: defaultReplicaPlacement,
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garbageThreshold: garbageThreshold,
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whiteList: whiteList,
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}
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ms.bounedLeaderChan = make(chan int, 16)
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seq := sequence.NewFileSequencer(path.Join(metaFolder, "weed.seq"))
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var e error
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if ms.Topo, e = topology.NewTopology("topo", confFile, seq,
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uint64(volumeSizeLimitMB)*1024*1024, pulseSeconds); e != nil {
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glog.Fatalf("cannot create topology:%s", e)
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}
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ms.vg = replication.NewDefaultVolumeGrowth()
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glog.V(0).Infoln("Volume Size Limit is", volumeSizeLimitMB, "MB")
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r.HandleFunc("/dir/assign", ms.proxyToLeader(secure(ms.whiteList, ms.dirAssignHandler)))
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r.HandleFunc("/dir/lookup", ms.proxyToLeader(secure(ms.whiteList, ms.dirLookupHandler)))
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r.HandleFunc("/dir/join", ms.proxyToLeader(secure(ms.whiteList, ms.dirJoinHandler)))
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r.HandleFunc("/dir/status", ms.proxyToLeader(secure(ms.whiteList, ms.dirStatusHandler)))
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r.HandleFunc("/col/delete", ms.proxyToLeader(secure(ms.whiteList, ms.collectionDeleteHandler)))
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r.HandleFunc("/vol/grow", ms.proxyToLeader(secure(ms.whiteList, ms.volumeGrowHandler)))
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r.HandleFunc("/vol/status", ms.proxyToLeader(secure(ms.whiteList, ms.volumeStatusHandler)))
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r.HandleFunc("/vol/vacuum", ms.proxyToLeader(secure(ms.whiteList, ms.volumeVacuumHandler)))
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r.HandleFunc("/submit", secure(ms.whiteList, ms.submitFromMasterServerHandler))
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r.HandleFunc("/{filekey}", ms.redirectHandler)
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ms.Topo.StartRefreshWritableVolumes(garbageThreshold)
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return ms
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}
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func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
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ms.Topo.RaftServer = raftServer.raftServer
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ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) {
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glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.")
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})
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if ms.Topo.IsLeader() {
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glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", "I am the leader!")
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} else {
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glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "is the leader.")
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}
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}
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func (ms *MasterServer) proxyToLeader(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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if ms.Topo.IsLeader() {
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f(w, r)
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} else {
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ms.bounedLeaderChan <- 1
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defer func() { <-ms.bounedLeaderChan }()
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targetUrl, err := url.Parse("http://" + ms.Topo.RaftServer.Leader())
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if err != nil {
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writeJsonQuiet(w, r, map[string]interface{}{"error": "Leader URL Parse Error " + err.Error()})
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return
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}
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glog.V(4).Infoln("proxying to leader", ms.Topo.RaftServer.Leader())
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proxy := httputil.NewSingleHostReverseProxy(targetUrl)
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proxy.Transport = util.Transport
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proxy.ServeHTTP(w, r)
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}
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}
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}
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