Move migrating repository from frontend to backend (#6200)

* move migrating to backend

* add loading image when migrating and fix tests

* fix format

* fix lint

* add redis task queue support and improve docs

* add redis vendor

* fix vet

* add database migrations and fix app.ini sample

* add comments for task section on app.ini.sample

* Update models/migrations/v84.go

Co-Authored-By: lunny <xiaolunwen@gmail.com>

* Update models/repo.go

Co-Authored-By: lunny <xiaolunwen@gmail.com>

* move migrating to backend

* add loading image when migrating and fix tests

* fix fmt

* add redis task queue support and improve docs

* fix fixtures

* fix fixtures

* fix duplicate function on index.js

* fix tests

* rename repository statuses

* check if repository is being create when SSH request

* fix lint

* fix template

* some improvements

* fix template

* unified migrate options

* fix lint

* fix loading page

* refactor

* When gitea restart, don't restart the running tasks because we may have servel gitea instances, that may break the migration

* fix js

* Update models/repo.go

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

* Update docs/content/doc/advanced/config-cheat-sheet.en-us.md

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

* fix tests

* rename ErrTaskIsNotExist to ErrTaskDoesNotExist

* delete release after add one on tests to make it run happy

* fix tests

* fix tests

* improve codes

* fix lint

* fix lint

* fix migrations

1 files changed, 120 insertions, 0 deletions

diff --git a/modules/task/migrate.go b/modules/task/migrate.go
new file mode 100644
index 0000000000..5d15a506d7
--- /dev/null
+++ b/modules/task/migrate.go
@@ -0,0 +1,120 @@
+// Copyright 2019 Gitea. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package task
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/migrations"
+	"code.gitea.io/gitea/modules/notification"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
+)
+
+func handleCreateError(owner *models.User, err error, name string) error {
+	switch {
+	case models.IsErrReachLimitOfRepo(err):
+		return fmt.Errorf("You have already reached your limit of %d repositories", owner.MaxCreationLimit())
+	case models.IsErrRepoAlreadyExist(err):
+		return errors.New("The repository name is already used")
+	case models.IsErrNameReserved(err):
+		return fmt.Errorf("The repository name '%s' is reserved", err.(models.ErrNameReserved).Name)
+	case models.IsErrNamePatternNotAllowed(err):
+		return fmt.Errorf("The pattern '%s' is not allowed in a repository name", err.(models.ErrNamePatternNotAllowed).Pattern)
+	default:
+		return err
+	}
+}
+
+func runMigrateTask(t *models.Task) (err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			var buf bytes.Buffer
+			fmt.Fprintf(&buf, "Handler crashed with error: %v", log.Stack(2))
+
+			err = errors.New(buf.String())
+		}
+
+		if err == nil {
+			err = models.FinishMigrateTask(t)
+			if err == nil {
+				notification.NotifyMigrateRepository(t.Doer, t.Owner, t.Repo)
+				return
+			}
+
+			log.Error("FinishMigrateTask failed: %s", err.Error())
+		}
+
+		t.EndTime = timeutil.TimeStampNow()
+		t.Status = structs.TaskStatusFailed
+		t.Errors = err.Error()
+		if err := t.UpdateCols("status", "errors", "end_time"); err != nil {
+			log.Error("Task UpdateCols failed: %s", err.Error())
+		}
+
+		if t.Repo != nil {
+			if errDelete := models.DeleteRepository(t.Doer, t.OwnerID, t.Repo.ID); errDelete != nil {
+				log.Error("DeleteRepository: %v", errDelete)
+			}
+		}
+	}()
+
+	if err := t.LoadRepo(); err != nil {
+		return err
+	}
+
+	// if repository is ready, then just finsih the task
+	if t.Repo.Status == models.RepositoryReady {
+		return nil
+	}
+
+	if err := t.LoadDoer(); err != nil {
+		return err
+	}
+	if err := t.LoadOwner(); err != nil {
+		return err
+	}
+	t.StartTime = timeutil.TimeStampNow()
+	t.Status = structs.TaskStatusRunning
+	if err := t.UpdateCols("start_time", "status"); err != nil {
+		return err
+	}
+
+	var opts *structs.MigrateRepoOption
+	opts, err = t.MigrateConfig()
+	if err != nil {
+		return err
+	}
+
+	opts.MigrateToRepoID = t.RepoID
+	repo, err := migrations.MigrateRepository(t.Doer, t.Owner.Name, *opts)
+	if err == nil {
+		notification.NotifyMigrateRepository(t.Doer, t.Owner, repo)
+
+		log.Trace("Repository migrated [%d]: %s/%s", repo.ID, t.Owner.Name, repo.Name)
+		return nil
+	}
+
+	if models.IsErrRepoAlreadyExist(err) {
+		return errors.New("The repository name is already used")
+	}
+
+	// remoteAddr may contain credentials, so we sanitize it
+	err = util.URLSanitizedError(err, opts.CloneAddr)
+	if strings.Contains(err.Error(), "Authentication failed") ||
+		strings.Contains(err.Error(), "could not read Username") {
+		return fmt.Errorf("Authentication failed: %v", err.Error())
+	} else if strings.Contains(err.Error(), "fatal:") {
+		return fmt.Errorf("Migration failed: %v", err.Error())
+	}
+
+	return handleCreateError(t.Owner, err, "MigratePost")
+}