directory structure change to work with glide

glide has its own requirements. My previous workaround caused me some
code checkin errors. Need to fix this.

weed/server/raft_server_handlers.go

@@ -0,0 +1,64 @@
+package weed_server
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	"github.com/chrislusf/raft"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/operation"
+)
+
+// 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{}
+
+	commandText, _ := ioutil.ReadAll(req.Body)
+	glog.V(0).Info("Command:", string(commandText))
+	if err := json.NewDecoder(strings.NewReader(string(commandText))).Decode(&command); err != nil {
+		glog.V(0).Infoln("Error decoding json message:", err, string(commandText))
+		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 leader, e := s.topo.Leader(); e == nil {
+		//http.StatusMovedPermanently does not cause http POST following redirection
+		glog.V(0).Infoln("Redirecting to", http.StatusMovedPermanently, "http://"+leader+req.URL.Path)
+		http.Redirect(w, req, "http://"+leader+req.URL.Path, http.StatusMovedPermanently)
+	} else {
+		glog.V(0).Infoln("Error: Leader Unknown")
+		http.Error(w, "Leader unknown", http.StatusInternalServerError)
+	}
+}
+
+func (s *RaftServer) statusHandler(w http.ResponseWriter, r *http.Request) {
+	ret := operation.ClusterStatusResult{
+		IsLeader: s.topo.IsLeader(),
+		Peers:    s.Peers(),
+	}
+	if leader, e := s.topo.Leader(); e == nil {
+		ret.Leader = leader
+	}
+	writeJsonQuiet(w, r, http.StatusOK, ret)
+}