refactoring code

reusable code by go clients

go/operation/assign_file_id.go

@@ -0,0 +1,40 @@
+package operation
+
+import (
+	"code.google.com/p/weed-fs/go/glog"
+	"code.google.com/p/weed-fs/go/util"
+	"encoding/json"
+	"errors"
+	"net/url"
+	"strconv"
+)
+
+type AssignResult struct {
+	Fid       string `json:"fid"`
+	Url       string `json:"url"`
+	PublicUrl string `json:"publicUrl"`
+	Count     int
+	Error     string `json:"error"`
+}
+
+func Assign(server string, count int, replication string) (*AssignResult, error) {
+	values := make(url.Values)
+	values.Add("count", strconv.Itoa(count))
+	if replication != "" {
+		values.Add("replication", replication)
+	}
+	jsonBlob, err := util.Post("http://"+server+"/dir/assign", values)
+	glog.V(2).Info("assign result :", string(jsonBlob))
+	if err != nil {
+		return nil, err
+	}
+	var ret AssignResult
+	err = json.Unmarshal(jsonBlob, &ret)
+	if err != nil {
+		return nil, err
+	}
+	if ret.Count <= 0 {
+		return nil, errors.New(ret.Error)
+	}
+	return &ret, nil
+}