add s3 multipart upload

weed/server/filer_server_handlers_read.go

@@ -119,6 +119,7 @@ func (fs *FilerServer) handleMultipleChunks(w http.ResponseWriter, r *http.Reque
 	if mimeType != "" {
 		w.Header().Set("Content-Type", mimeType)
 	}
+	setEtag(w, filer2.ETag(entry.Chunks))
 
 	totalSize := int64(filer2.TotalSize(entry.Chunks))
 

weed/server/filer_server_handlers_write.go

@@ -150,6 +150,7 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	defer resp.Body.Close()
+	etag := resp.Header.Get("ETag")
 	resp_body, ra_err := ioutil.ReadAll(resp.Body)
 	if ra_err != nil {
 		glog.V(0).Infoln("failing to upload to volume server", r.RequestURI, ra_err.Error())
@@ -202,6 +203,7 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 			FileId: fileId,
 			Size:   uint64(ret.Size),
 			Mtime:  time.Now().UnixNano(),
+			ETag:   etag,
 		}},
 	}
 	if db_err := fs.filer.CreateEntry(entry); db_err != nil {

weed/server/volume_server_handlers_read.go

@@ -88,12 +88,11 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 			}
 		}
 	}
-	etag := n.Etag()
-	if inm := r.Header.Get("If-None-Match"); inm == etag {
+	if inm := r.Header.Get("If-None-Match"); inm == "\""+n.Etag()+"\"" {
 		w.WriteHeader(http.StatusNotModified)
 		return
 	}
-	w.Header().Set("Etag", etag)
+	setEtag(w, n.Etag())
 
 	if n.HasPairs() {
 		pairMap := make(map[string]string)

weed/server/volume_server_handlers_write.go

@@ -44,8 +44,7 @@ func (vs *VolumeServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		ret.Name = string(needle.Name)
 	}
 	ret.Size = size
-	etag := needle.Etag()
-	w.Header().Set("Etag", etag)
+	setEtag(w, needle.Etag())
 	writeJsonQuiet(w, r, httpStatus, ret)
 }
 
@@ -173,3 +172,9 @@ func (vs *VolumeServer) batchDeleteHandler(w http.ResponseWriter, r *http.Reques
 
 	writeJsonQuiet(w, r, http.StatusAccepted, ret)
 }
+
+func setEtag(w http.ResponseWriter, etag string) {
+	if etag != "" {
+		w.Header().Set("ETag", "\""+etag+"\"")
+	}
+}