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working auto fail-over master node

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This commit is contained in:
Chris Lu
2014-02-05 01:54:52 -08:00
parent d6fbd741fd
commit e7585548a4
3 changed files with 39 additions and 12 deletions
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45
go/weed/weed_server/master_server.go
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@@ -6,6 +6,9 @@ import (
"code.google.com/p/weed-fs/go/sequence"
"code.google.com/p/weed-fs/go/topology"
"github.com/gorilla/mux"
"net/http"
"net/http/httputil"
"net/url"
"path"
"sync"
)
@@ -23,6 +26,8 @@ type MasterServer struct {
topo *topology.Topology
vg *replication.VolumeGrowth
vgLock sync.Mutex
raftServer *RaftServer
}
func NewMasterServer(r *mux.Router, version string, port int, metaFolder string,
@@ -31,7 +36,8 @@ func NewMasterServer(r *mux.Router, version string, port int, metaFolder string,
confFile string,
defaultRepType string,
garbageThreshold string,
whiteList []string) *MasterServer {
whiteList []string,
) *MasterServer {
ms := &MasterServer{
version: version,
volumeSizeLimitMB: volumeSizeLimitMB,
@@ -49,17 +55,38 @@ func NewMasterServer(r *mux.Router, version string, port int, metaFolder string,
ms.vg = replication.NewDefaultVolumeGrowth()
glog.V(0).Infoln("Volume Size Limit is", volumeSizeLimitMB, "MB")
r.HandleFunc("/dir/assign", secure(ms.whiteList, ms.dirAssignHandler))
r.HandleFunc("/dir/lookup", secure(ms.whiteList, ms.dirLookupHandler))
r.HandleFunc("/dir/join", secure(ms.whiteList, ms.dirJoinHandler))
r.HandleFunc("/dir/status", secure(ms.whiteList, ms.dirStatusHandler))
r.HandleFunc("/vol/grow", secure(ms.whiteList, ms.volumeGrowHandler))
r.HandleFunc("/vol/status", secure(ms.whiteList, ms.volumeStatusHandler))
r.HandleFunc("/vol/vacuum", secure(ms.whiteList, ms.volumeVacuumHandler))
r.HandleFunc("/submit", secure(ms.whiteList, ms.submitFromMasterServerHandler))
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("/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", ms.proxyToLeader(secure(ms.whiteList, ms.submitFromMasterServerHandler)))
r.HandleFunc("/", ms.redirectHandler)
ms.topo.StartRefreshWritableVolumes(garbageThreshold)
return ms
}
func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
ms.raftServer = raftServer
}
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.raftServer == nil || ms.raftServer.IsLeader() {
f(w, r)
} else {
targetUrl, err := url.Parse("http://" + ms.raftServer.Leader())
if err != nil {
writeJsonQuiet(w, r, map[string]interface{}{"error": "Leader URL Parse Error " + err.Error()})
return
}
glog.V(4).Infoln("proxying to leader", ms.raftServer.Leader())
proxy := httputil.NewSingleHostReverseProxy(targetUrl)
proxy.ServeHTTP(w, r)
}
}
}