Move restore repo to internal router and invoke from command to avoid open the same db file or queues files (#15790)

* Move restore repo to internal router and invoke from command to avoid open the same db file or queues files

* Follow @zeripath's review

* set no timeout for resotre repo private request

* make restore repo cancelable

modules/private/restore_repo.go

@@ -0,0 +1,60 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package private
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	"code.gitea.io/gitea/modules/setting"
+	jsoniter "github.com/json-iterator/go"
+)
+
+// RestoreParams structure holds a data for restore repository
+type RestoreParams struct {
+	RepoDir   string
+	OwnerName string
+	RepoName  string
+	Units     []string
+}
+
+// RestoreRepo calls the internal RestoreRepo function
+func RestoreRepo(repoDir, ownerName, repoName string, units []string) (int, string) {
+	reqURL := setting.LocalURL + "api/internal/restore_repo"
+
+	req := newInternalRequest(reqURL, "POST")
+	req.SetTimeout(3*time.Second, 0) // since the request will spend much time, don't timeout
+	req = req.Header("Content-Type", "application/json")
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
+	jsonBytes, _ := json.Marshal(RestoreParams{
+		RepoDir:   repoDir,
+		OwnerName: ownerName,
+		RepoName:  repoName,
+		Units:     units,
+	})
+	req.Body(jsonBytes)
+	resp, err := req.Response()
+	if err != nil {
+		return http.StatusInternalServerError, fmt.Sprintf("Unable to contact gitea: %v, could you confirm it's running?", err.Error())
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		var ret = struct {
+			Err string `json:"err"`
+		}{}
+		body, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return http.StatusInternalServerError, fmt.Sprintf("Response body error: %v", err.Error())
+		}
+		if err := json.Unmarshal(body, &ret); err != nil {
+			return http.StatusInternalServerError, fmt.Sprintf("Response body Unmarshal error: %v", err.Error())
+		}
+	}
+
+	return http.StatusOK, fmt.Sprintf("Restore repo %s/%s successfully", ownerName, repoName)
+}