a start for distributed master support, not working yet

go/weed/weed_server/raft_server_handlers.go

@@ -0,0 +1,46 @@
+package weed_server
+
+import (
+	"code.google.com/p/weed-fs/go/glog"
+	"encoding/json"
+	"github.com/goraft/raft"
+	"net/http"
+)
+
+// Handles incoming RAFT joins.
+func (s *RaftServer) joinHandler(w http.ResponseWriter, req *http.Request) {
+	glog.V(0).Infoln("Processing incoming join. Current Leader", s.raftServer.Leader(), "Self", s.raftServer.Name(), "Peers", s.raftServer.Peers())
+	command := &raft.DefaultJoinCommand{}
+
+	if err := json.NewDecoder(req.Body).Decode(&command); err != nil {
+		glog.V(0).Infoln("Error decoding json message:", err)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	glog.V(0).Infoln("join command from Name", command.Name, "Connection", command.ConnectionString)
+
+	if _, err := s.raftServer.Do(command); err != nil {
+		switch err {
+		case raft.NotLeaderError:
+			s.redirectToLeader(w, req)
+		default:
+			glog.V(0).Infoln("Error processing join:", err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+		}
+	}
+}
+
+func (s *RaftServer) HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) {
+	s.router.HandleFunc(pattern, handler)
+}
+
+func (s *RaftServer) redirectToLeader(w http.ResponseWriter, req *http.Request) {
+	if s.Leader() != "" {
+		glog.V(0).Infoln("Redirecting to", "http://"+s.Leader()+req.URL.Path)
+		http.Redirect(w, req, "http://"+s.Leader()+req.URL.Path, http.StatusMovedPermanently)
+	} else {
+		glog.V(0).Infoln("Error: Leader Unknown")
+		http.Error(w, "Leader unknown", http.StatusInternalServerError)
+	}
+}