refactoring, same logic, but the store replication logic is moved to a

stand-alone file, for later easier improvements

go/replication/store_replicate.go

@@ -0,0 +1,95 @@
+package replication
+
+import (
+	"bytes"
+	"code.google.com/p/weed-fs/go/operation"
+  "code.google.com/p/weed-fs/go/storage"
+	"log"
+	"net/http"
+	"strconv"
+)
+
+func ReplicatedWrite(masterNode string, s *storage.Store, volumeId storage.VolumeId, needle *storage.Needle, r *http.Request) (size uint32, errorStatus string) {
+	ret, err := s.Write(volumeId, needle)
+	needToReplicate := !s.HasVolume(volumeId)
+	if err != nil {
+		errorStatus = "Failed to write to local disk (" + err.Error() + ")"
+	} else if ret > 0 {
+		needToReplicate = needToReplicate || s.GetVolume(volumeId).NeedToReplicate()
+	} else {
+		errorStatus = "Failed to write to local disk"
+	}
+	if !needToReplicate && ret > 0 {
+		needToReplicate = s.GetVolume(volumeId).NeedToReplicate()
+	}
+	if needToReplicate { //send to other replica locations
+		if r.FormValue("type") != "standard" {
+			if !distributedOperation(masterNode, s, volumeId, func(location operation.Location) bool {
+				_, err := operation.Upload("http://"+location.Url+r.URL.Path+"?type=standard", string(needle.Name), bytes.NewReader(needle.Data))
+				return err == nil
+			}) {
+				ret = 0
+				errorStatus = "Failed to write to replicas for volume " + volumeId.String()
+			}
+		}
+	}
+	if errorStatus != "" {
+		if _, err = s.Delete(volumeId, needle); err != nil {
+			errorStatus += "\nCannot delete " + strconv.FormatUint(needle.Id, 10) + " from " +
+				strconv.FormatUint(uint64(volumeId), 10) + ": " + err.Error()
+		} else {
+			distributedOperation(masterNode, s, volumeId, func(location operation.Location) bool {
+				return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
+			})
+		}
+	}
+	size = ret
+	return
+}
+
+func ReplicatedDelete(masterNode string, store *storage.Store, volumeId storage.VolumeId, n *storage.Needle, r *http.Request) (ret uint32) {
+	ret, err := store.Delete(volumeId, n)
+	if err != nil {
+		log.Println("delete error:", err)
+		return
+	}
+
+	needToReplicate := !store.HasVolume(volumeId)
+	if !needToReplicate && ret > 0 {
+		needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
+	}
+	if needToReplicate { //send to other replica locations
+		if r.FormValue("type") != "standard" {
+			if !distributedOperation(masterNode, store, volumeId, func(location operation.Location) bool {
+				return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
+			}) {
+				ret = 0
+			}
+		}
+	}
+	return
+}
+
+func distributedOperation(masterNode string, store *storage.Store, volumeId storage.VolumeId, op func(location operation.Location) bool) bool {
+	if lookupResult, lookupErr := operation.Lookup(masterNode, volumeId); lookupErr == nil {
+		length := 0
+		selfUrl := (store.Ip + ":" + strconv.Itoa(store.Port))
+		results := make(chan bool)
+		for _, location := range lookupResult.Locations {
+			if location.Url != selfUrl {
+				length++
+				go func(location operation.Location, results chan bool) {
+					results <- op(location)
+				}(location, results)
+			}
+		}
+		ret := true
+		for i := 0; i < length; i++ {
+			ret = ret && <-results
+		}
+		return ret
+	} else {
+		log.Println("Failed to lookup for", volumeId, lookupErr.Error())
+	}
+	return false
+}

go/storage/file_id.go

@@ -1,19 +1,18 @@
-package directory
+package storage
 
 import (
-	"code.google.com/p/weed-fs/go/storage"
 	"code.google.com/p/weed-fs/go/util"
 	"encoding/hex"
 	"strings"
 )
 
 type FileId struct {
-	VolumeId storage.VolumeId
+	VolumeId VolumeId
 	Key      uint64
 	Hashcode uint32
 }
 
-func NewFileId(VolumeId storage.VolumeId, Key uint64, Hashcode uint32) *FileId {
+func NewFileId(VolumeId VolumeId, Key uint64, Hashcode uint32) *FileId {
 	return &FileId{VolumeId: VolumeId, Key: Key, Hashcode: Hashcode}
 }
 func ParseFileId(fid string) *FileId {
@@ -23,8 +22,8 @@ func ParseFileId(fid string) *FileId {
 		return nil
 	}
 	vid_string, key_hash_string := a[0], a[1]
-	volumeId, _ := storage.NewVolumeId(vid_string)
+	volumeId, _ := NewVolumeId(vid_string)
-	key, hash := storage.ParseKeyHash(key_hash_string)
+	key, hash := ParseKeyHash(key_hash_string)
 	return &FileId{VolumeId: volumeId, Key: key, Hashcode: hash}
 }
 func (n *FileId) String() string {

go/storage/needle.go

@@ -36,7 +36,7 @@ type Needle struct {
 	Padding  []byte `comment:"Aligned to 8 bytes"`
 }
 
-func NewNeedle(r *http.Request) (n *Needle, fname string, e error) {
+func NewNeedle(r *http.Request) (n *Needle, e error) {
 
 	n = new(Needle)
 	form, fe := r.MultipartReader()
@@ -51,7 +51,7 @@ func NewNeedle(r *http.Request) (n *Needle, fname string, e error) {
 		e = fe
 		return
 	}
-	fname = part.FileName()
+	fname := part.FileName()
 	if fname != "" {
 		fname = path.Base(part.FileName())
 	} else {

go/topology/topology.go

@@ -1,7 +1,6 @@
 package topology
 
 import (
-	"code.google.com/p/weed-fs/go/directory"
 	"code.google.com/p/weed-fs/go/sequence"
 	"code.google.com/p/weed-fs/go/storage"
 	"errors"
@@ -109,7 +108,7 @@ func (t *Topology) PickForWrite(repType storage.ReplicationType, count int) (str
 		return "", 0, nil, errors.New("No writable volumes avalable!")
 	}
 	fileId, count := t.sequence.NextFileId(count)
-	return directory.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
+	return storage.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
 }
 
 func (t *Topology) GetVolumeLayout(repType storage.ReplicationType) *VolumeLayout {

go/weed/export.go

@@ -3,7 +3,6 @@ package main
 import (
 	"archive/tar"
 	"bytes"
-	"code.google.com/p/weed-fs/go/directory"
 	"code.google.com/p/weed-fs/go/storage"
 	"fmt"
 	"log"
@@ -127,7 +126,7 @@ type nameParams struct {
 }
 
 func walker(vid storage.VolumeId, n *storage.Needle, version storage.Version) (err error) {
-	key := directory.NewFileId(vid, n.Id, n.Cookie).String()
+	key := storage.NewFileId(vid, n.Id, n.Cookie).String()
 	if tarFh != nil {
 		fnTmplBuf.Reset()
 		if err = fnTmpl.Execute(fnTmplBuf,

go/weed/volume.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-	"bytes"
 	"code.google.com/p/weed-fs/go/operation"
+  "code.google.com/p/weed-fs/go/replication"
 	"code.google.com/p/weed-fs/go/storage"
 	"log"
 	"math/rand"
@@ -187,46 +187,15 @@ func PostHandler(w http.ResponseWriter, r *http.Request) {
 	if e != nil {
 		writeJsonQuiet(w, r, e)
 	} else {
-		needle, filename, ne := storage.NewNeedle(r)
+		needle, ne := storage.NewNeedle(r)
 		if ne != nil {
 			writeJsonQuiet(w, r, ne)
 		} else {
-			ret, err := store.Write(volumeId, needle)
+			ret, errorStatus := replication.ReplicatedWrite(*masterNode, store, volumeId, needle, r)
-			errorStatus := ""
-			needToReplicate := !store.HasVolume(volumeId)
-			if err != nil {
-				errorStatus = "Failed to write to local disk (" + err.Error() + ")"
-			} else if ret > 0 {
-				needToReplicate = needToReplicate || store.GetVolume(volumeId).NeedToReplicate()
-			} else {
-				errorStatus = "Failed to write to local disk"
-			}
-			if !needToReplicate && ret > 0 {
-				needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
-			}
-			if needToReplicate { //send to other replica locations
-				if r.FormValue("type") != "standard" {
-					if !distributedOperation(volumeId, func(location operation.Location) bool {
-						_, err := operation.Upload("http://"+location.Url+r.URL.Path+"?type=standard", filename, bytes.NewReader(needle.Data))
-						return err == nil
-					}) {
-						ret = 0
-						errorStatus = "Failed to write to replicas for volume " + volumeId.String()
-					}
-				}
-			}
 			m := make(map[string]interface{})
 			if errorStatus == "" {
 				w.WriteHeader(http.StatusCreated)
 			} else {
-				if _, e = store.Delete(volumeId, needle); e != nil {
-					errorStatus += "\nCannot delete " + strconv.FormatUint(needle.Id, 10) + " from " +
-						strconv.FormatUint(uint64(volumeId), 10) + ": " + e.Error()
-				} else {
-					distributedOperation(volumeId, func(location operation.Location) bool {
-						return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
-					})
-				}
 				w.WriteHeader(http.StatusInternalServerError)
 				m["error"] = errorStatus
 			}
@@ -259,25 +228,7 @@ func DeleteHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	n.Size = 0
-	ret, err := store.Delete(volumeId, n)
+	ret := replication.ReplicatedDelete(*masterNode, store, volumeId, n, r)
-	if err != nil {
-		log.Println("delete error:", err)
-		return
-	}
-
-	needToReplicate := !store.HasVolume(volumeId)
-	if !needToReplicate && ret > 0 {
-		needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
-	}
-	if needToReplicate { //send to other replica locations
-		if r.FormValue("type") != "standard" {
-			if !distributedOperation(volumeId, func(location operation.Location) bool {
-				return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
-			}) {
-				ret = 0
-			}
-		}
-	}
 
 	if ret != 0 {
 		w.WriteHeader(http.StatusAccepted)
@@ -311,30 +262,6 @@ func parseURLPath(path string) (vid, fid, ext string) {
 	return
 }
 
-func distributedOperation(volumeId storage.VolumeId, op func(location operation.Location) bool) bool {
-	if lookupResult, lookupErr := operation.Lookup(*masterNode, volumeId); lookupErr == nil {
-		length := 0
-		selfUrl := (*ip + ":" + strconv.Itoa(*vport))
-		results := make(chan bool)
-		for _, location := range lookupResult.Locations {
-			if location.Url != selfUrl {
-				length++
-				go func(location operation.Location, results chan bool) {
-					results <- op(location)
-				}(location, results)
-			}
-		}
-		ret := true
-		for i := 0; i < length; i++ {
-			ret = ret && <-results
-		}
-		return ret
-	} else {
-		log.Println("Failed to lookup for", volumeId, lookupErr.Error())
-	}
-	return false
-}
-
 func runVolume(cmd *Command, args []string) bool {
 	if *vMaxCpu < 1 {
 		*vMaxCpu = runtime.NumCPU()