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/master_server_handlers.go

@@ -0,0 +1,104 @@
+package weed_server
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/stats"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+)
+
+func (ms *MasterServer) lookupVolumeId(vids []string, collection string) (volumeLocations map[string]operation.LookupResult) {
+	volumeLocations = make(map[string]operation.LookupResult)
+	for _, vid := range vids {
+		commaSep := strings.Index(vid, ",")
+		if commaSep > 0 {
+			vid = vid[0:commaSep]
+		}
+		if _, ok := volumeLocations[vid]; ok {
+			continue
+		}
+		volumeId, err := storage.NewVolumeId(vid)
+		if err == nil {
+			machines := ms.Topo.Lookup(collection, volumeId)
+			if machines != nil {
+				var ret []operation.Location
+				for _, dn := range machines {
+					ret = append(ret, operation.Location{Url: dn.Url(), PublicUrl: dn.PublicUrl})
+				}
+				volumeLocations[vid] = operation.LookupResult{VolumeId: vid, Locations: ret}
+			} else {
+				volumeLocations[vid] = operation.LookupResult{VolumeId: vid, Error: "volumeId not found."}
+			}
+		} else {
+			volumeLocations[vid] = operation.LookupResult{VolumeId: vid, Error: "Unknown volumeId format."}
+		}
+	}
+	return
+}
+
+// Takes one volumeId only, can not do batch lookup
+func (ms *MasterServer) dirLookupHandler(w http.ResponseWriter, r *http.Request) {
+	vid := r.FormValue("volumeId")
+	commaSep := strings.Index(vid, ",")
+	if commaSep > 0 {
+		vid = vid[0:commaSep]
+	}
+	vids := []string{vid}
+	collection := r.FormValue("collection") //optional, but can be faster if too many collections
+	volumeLocations := ms.lookupVolumeId(vids, collection)
+	location := volumeLocations[vid]
+	httpStatus := http.StatusOK
+	if location.Error != "" {
+		httpStatus = http.StatusNotFound
+	}
+	writeJsonQuiet(w, r, httpStatus, location)
+}
+
+// This can take batched volumeIds, &volumeId=x&volumeId=y&volumeId=z
+func (ms *MasterServer) volumeLookupHandler(w http.ResponseWriter, r *http.Request) {
+	r.ParseForm()
+	vids := r.Form["volumeId"]
+	collection := r.FormValue("collection") //optional, but can be faster if too many collections
+	volumeLocations := ms.lookupVolumeId(vids, collection)
+	writeJsonQuiet(w, r, http.StatusOK, volumeLocations)
+}
+
+func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request) {
+	stats.AssignRequest()
+	requestedCount, e := strconv.ParseUint(r.FormValue("count"), 10, 64)
+	if e != nil || requestedCount == 0 {
+		requestedCount = 1
+	}
+
+	option, err := ms.getVolumeGrowOption(r)
+	if err != nil {
+		writeJsonQuiet(w, r, http.StatusNotAcceptable, operation.AssignResult{Error: err.Error()})
+		return
+	}
+
+	if !ms.Topo.HasWritableVolume(option) {
+		if ms.Topo.FreeSpace() <= 0 {
+			writeJsonQuiet(w, r, http.StatusNotFound, operation.AssignResult{Error: "No free volumes left!"})
+			return
+		}
+		ms.vgLock.Lock()
+		defer ms.vgLock.Unlock()
+		if !ms.Topo.HasWritableVolume(option) {
+			if _, err = ms.vg.AutomaticGrowByType(option, ms.Topo); err != nil {
+				writeJsonError(w, r, http.StatusInternalServerError,
+					fmt.Errorf("Cannot grow volume group! %v", err))
+				return
+			}
+		}
+	}
+	fid, count, dn, err := ms.Topo.PickForWrite(requestedCount, option)
+	if err == nil {
+		writeJsonQuiet(w, r, http.StatusOK, operation.AssignResult{Fid: fid, Url: dn.Url(), PublicUrl: dn.PublicUrl, Count: count})
+	} else {
+		writeJsonQuiet(w, r, http.StatusNotAcceptable, operation.AssignResult{Error: err.Error()})
+	}
+}