add cmd/dump - a dumper

Walk needed to be added to NeedleMap and CompactMap, to be able to add WalkKeys and WalkValues to volume. This is needed for iterating through all the stored needles in a volume - this was dump's purpose.

weed-fs/src/pkg/operation/upload_content.go

@@ -3,18 +3,18 @@ package operation
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	_ "fmt"
 	"io"
 	"io/ioutil"
-  "log"
+	"log"
 	"mime/multipart"
 	"net/http"
-	"errors"
 )
 
 type UploadResult struct {
-	Size int
-  Error string
+	Size  int
+	Error string
 }
 
 func Upload(uploadUrl string, filename string, reader io.Reader) (*UploadResult, error) {
@@ -26,7 +26,7 @@ func Upload(uploadUrl string, filename string, reader io.Reader) (*UploadResult,
 	body_writer.Close()
 	resp, err := http.Post(uploadUrl, content_type, body_buf)
 	if err != nil {
-    log.Println("failing to upload to", uploadUrl)
+		log.Println("failing to upload to", uploadUrl)
 		return nil, err
 	}
 	defer resp.Body.Close()
@@ -37,11 +37,11 @@ func Upload(uploadUrl string, filename string, reader io.Reader) (*UploadResult,
 	var ret UploadResult
 	err = json.Unmarshal(resp_body, &ret)
 	if err != nil {
-    log.Println("failing to read upload resonse", uploadUrl, resp_body)
-    return nil, err
+		log.Println("failing to read upload resonse", uploadUrl, resp_body)
+		return nil, err
 	}
-	if ret.Error != ""{
-	  return nil, errors.New(ret.Error)
+	if ret.Error != "" {
+		return nil, errors.New(ret.Error)
 	}
 	return &ret, nil
 }