dereplicate filer post request & support filer get request with raw fileId

go/weed/weed_server/filer_server_handlers.go

@@ -1,6 +1,7 @@
 package weed_server
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"io"
@@ -13,6 +14,7 @@ import (
 
 	"github.com/chrislusf/seaweedfs/go/glog"
 	"github.com/chrislusf/seaweedfs/go/operation"
+	"github.com/chrislusf/seaweedfs/go/storage"
 	"github.com/chrislusf/seaweedfs/go/util"
 	"github.com/syndtr/goleveldb/leveldb"
 )
@@ -32,6 +34,15 @@ func (fs *FilerServer) filerHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (fs *FilerServer) publicReadOnlyfilerHandler(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case "GET":
+		fs.GetOrHeadHandler(w, r, true)
+	case "HEAD":
+		fs.GetOrHeadHandler(w, r, false)
+	}
+}
+
 // listDirectoryHandler lists directories and folers under a directory
 // files are sorted by name and paginated via "lastFileName" and "limit".
 // sub directories are listed on the first page, when "lastFileName"
@@ -68,11 +79,20 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 		fs.listDirectoryHandler(w, r)
 		return
 	}
-	fileId, err := fs.filer.FindFile(r.URL.Path)
-	if err == leveldb.ErrNotFound {
-		glog.V(3).Infoln("Not found in db", r.URL.Path)
-		w.WriteHeader(http.StatusNotFound)
-		return
+	var fileId string
+	uri_elements := strings.Split(r.URL.Path, "/")
+	//glog.V(1).Infof("debug uri_elements %#v", uri_elements)
+	if len(uri_elements) == 2 {
+		// /3,01e587647e will be split into []string{"","3,01e587647e"}
+		fileId = uri_elements[1]
+	} else {
+		var err error
+		fileId, err = fs.filer.FindFile(r.URL.Path)
+		if err == leveldb.ErrNotFound {
+			glog.V(3).Infoln("Not found in db", r.URL.Path)
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
 	}
 	parts := strings.Split(fileId, ",")
 	if len(parts) != 2 {
@@ -124,6 +144,13 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 	io.Copy(w, resp.Body)
 }
 
+type analogueReader struct {
+	*bytes.Buffer
+}
+
+// So that it implements the io.ReadCloser interface
+func (m analogueReader) Close() error { return nil }
+
 func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 	query := r.URL.Query()
 	replication := query.Get("replication")
@@ -134,14 +161,63 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 	if collection == "" {
 		collection = fs.collection
 	}
-	assignResult, ae := operation.Assign(fs.master, 1, replication, collection, query.Get("ttl"))
-	if ae != nil {
-		glog.V(0).Infoln("failing to assign a file id", ae.Error())
-		writeJsonError(w, r, http.StatusInternalServerError, ae)
+
+	buf, _ := ioutil.ReadAll(r.Body)
+	r.Body = analogueReader{bytes.NewBuffer(buf)}
+	fileName, _, _, _, _, _, _, pe := storage.ParseUpload(r)
+	if pe != nil {
+		glog.V(0).Infoln("failing to parse post body", pe.Error())
+		writeJsonError(w, r, http.StatusInternalServerError, pe)
 		return
 	}
+	//reconstruct http request body for following new request to volume server
+	r.Body = analogueReader{bytes.NewBuffer(buf)}
 
-	u, _ := url.Parse("http://" + assignResult.Url + "/" + assignResult.Fid)
+	path := r.URL.Path
+	if strings.HasSuffix(path, "/") {
+		if fileName != "" {
+			path += fileName
+		}
+	}
+	var fileId string
+	var err error
+	var urlLocation string
+	if fileId, err = fs.filer.FindFile(path); err != nil {
+		glog.V(0).Infoln("failing to find path in filer store", path, pe.Error())
+		writeJsonError(w, r, http.StatusInternalServerError, err)
+		return
+	} else if fileId != "" {
+		parts := strings.Split(fileId, ",")
+		if len(parts) != 2 {
+			glog.V(1).Infoln("Invalid fileId", fileId)
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		lookup, lookupError := operation.Lookup(fs.master, parts[0])
+		if lookupError != nil {
+			glog.V(1).Infoln("Invalid lookup", lookupError.Error())
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		if len(lookup.Locations) == 0 {
+			glog.V(1).Infoln("Can not find location for volume", parts[0])
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		urlLocation = lookup.Locations[rand.Intn(len(lookup.Locations))].Url
+
+	} else {
+		assignResult, ae := operation.Assign(fs.master, 1, replication, collection, query.Get("ttl"))
+		if ae != nil {
+			glog.V(0).Infoln("failing to assign a file id", ae.Error())
+			writeJsonError(w, r, http.StatusInternalServerError, ae)
+			return
+		}
+		fileId = assignResult.Fid
+		urlLocation = assignResult.Url
+	}
+
+	u, _ := url.Parse("http://" + urlLocation + "/" + fileId)
 	glog.V(4).Infoln("post to", u)
 	request := &http.Request{
 		Method:        r.Method,
@@ -180,21 +256,21 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		writeJsonError(w, r, http.StatusInternalServerError, errors.New(ret.Error))
 		return
 	}
-	path := r.URL.Path
+	path = r.URL.Path
 	if strings.HasSuffix(path, "/") {
 		if ret.Name != "" {
 			path += ret.Name
 		} else {
-			operation.DeleteFile(fs.master, assignResult.Fid, fs.jwt(assignResult.Fid)) //clean up
+			operation.DeleteFile(fs.master, fileId, fs.jwt(fileId)) //clean up
 			glog.V(0).Infoln("Can not to write to folder", path, "without a file name!")
 			writeJsonError(w, r, http.StatusInternalServerError,
 				errors.New("Can not to write to folder "+path+" without a file name"))
 			return
 		}
 	}
-	glog.V(4).Infoln("saving", path, "=>", assignResult.Fid)
-	if db_err := fs.filer.CreateFile(path, assignResult.Fid); db_err != nil {
-		operation.DeleteFile(fs.master, assignResult.Fid, fs.jwt(assignResult.Fid)) //clean up
+	glog.V(4).Infoln("saving", path, "=>", fileId)
+	if db_err := fs.filer.CreateFile(path, fileId); db_err != nil {
+		operation.DeleteFile(fs.master, fileId, fs.jwt(fileId)) //clean up
 		glog.V(0).Infof("failing to write %s to filer server : %v", path, db_err)
 		writeJsonError(w, r, http.StatusInternalServerError, db_err)
 		return