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

5 files changed, 378 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")
+}
diff --git a/modules/task/queue.go b/modules/task/queue.go
new file mode 100644
index 0000000000..ddee0b3d46
--- /dev/null
+++ b/modules/task/queue.go
@@ -0,0 +1,14 @@
+// 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 "code.gitea.io/gitea/models"
+
+// Queue defines an interface to run task queue
+type Queue interface {
+	Run() error
+	Push(*models.Task) error
+	Stop()
+}
diff --git a/modules/task/queue_channel.go b/modules/task/queue_channel.go
new file mode 100644
index 0000000000..da541f4755
--- /dev/null
+++ b/modules/task/queue_channel.go
@@ -0,0 +1,48 @@
+// Copyright 2019 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 task
+
+import (
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
+)
+
+var (
+	_ Queue = &ChannelQueue{}
+)
+
+// ChannelQueue implements
+type ChannelQueue struct {
+	queue chan *models.Task
+}
+
+// NewChannelQueue create a memory channel queue
+func NewChannelQueue(queueLen int) *ChannelQueue {
+	return &ChannelQueue{
+		queue: make(chan *models.Task, queueLen),
+	}
+}
+
+// Run starts to run the queue
+func (c *ChannelQueue) Run() error {
+	for task := range c.queue {
+		err := Run(task)
+		if err != nil {
+			log.Error("Run task failed: %s", err.Error())
+		}
+	}
+	return nil
+}
+
+// Push will push the task ID to queue
+func (c *ChannelQueue) Push(task *models.Task) error {
+	c.queue <- task
+	return nil
+}
+
+// Stop stop the queue
+func (c *ChannelQueue) Stop() {
+	close(c.queue)
+}
diff --git a/modules/task/queue_redis.go b/modules/task/queue_redis.go
new file mode 100644
index 0000000000..127de0cdbf
--- /dev/null
+++ b/modules/task/queue_redis.go
@@ -0,0 +1,130 @@
+// Copyright 2019 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 task
+
+import (
+	"encoding/json"
+	"errors"
+	"strconv"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/go-redis/redis"
+)
+
+var (
+	_ Queue = &RedisQueue{}
+)
+
+type redisClient interface {
+	RPush(key string, args ...interface{}) *redis.IntCmd
+	LPop(key string) *redis.StringCmd
+	Ping() *redis.StatusCmd
+}
+
+// RedisQueue redis queue
+type RedisQueue struct {
+	client    redisClient
+	queueName string
+	closeChan chan bool
+}
+
+func parseConnStr(connStr string) (addrs, password string, dbIdx int, err error) {
+	fields := strings.Fields(connStr)
+	for _, f := range fields {
+		items := strings.SplitN(f, "=", 2)
+		if len(items) < 2 {
+			continue
+		}
+		switch strings.ToLower(items[0]) {
+		case "addrs":
+			addrs = items[1]
+		case "password":
+			password = items[1]
+		case "db":
+			dbIdx, err = strconv.Atoi(items[1])
+			if err != nil {
+				return
+			}
+		}
+	}
+	return
+}
+
+// NewRedisQueue creates single redis or cluster redis queue
+func NewRedisQueue(addrs string, password string, dbIdx int) (*RedisQueue, error) {
+	dbs := strings.Split(addrs, ",")
+	var queue = RedisQueue{
+		queueName: "task_queue",
+		closeChan: make(chan bool),
+	}
+	if len(dbs) == 0 {
+		return nil, errors.New("no redis host found")
+	} else if len(dbs) == 1 {
+		queue.client = redis.NewClient(&redis.Options{
+			Addr:     strings.TrimSpace(dbs[0]), // use default Addr
+			Password: password,                  // no password set
+			DB:       dbIdx,                     // use default DB
+		})
+	} else {
+		// cluster will ignore db
+		queue.client = redis.NewClusterClient(&redis.ClusterOptions{
+			Addrs:    dbs,
+			Password: password,
+		})
+	}
+	if err := queue.client.Ping().Err(); err != nil {
+		return nil, err
+	}
+	return &queue, nil
+}
+
+// Run starts to run the queue
+func (r *RedisQueue) Run() error {
+	for {
+		select {
+		case <-r.closeChan:
+			return nil
+		case <-time.After(time.Millisecond * 100):
+		}
+
+		bs, err := r.client.LPop(r.queueName).Bytes()
+		if err != nil {
+			if err != redis.Nil {
+				log.Error("LPop failed: %v", err)
+			}
+			time.Sleep(time.Millisecond * 100)
+			continue
+		}
+
+		var task models.Task
+		err = json.Unmarshal(bs, &task)
+		if err != nil {
+			log.Error("Unmarshal task failed: %s", err.Error())
+		} else {
+			err = Run(&task)
+			if err != nil {
+				log.Error("Run task failed: %s", err.Error())
+			}
+		}
+	}
+}
+
+// Push implements Queue
+func (r *RedisQueue) Push(task *models.Task) error {
+	bs, err := json.Marshal(task)
+	if err != nil {
+		return err
+	}
+	return r.client.RPush(r.queueName, bs).Err()
+}
+
+// Stop stop the queue
+func (r *RedisQueue) Stop() {
+	r.closeChan <- true
+}
diff --git a/modules/task/task.go b/modules/task/task.go
new file mode 100644
index 0000000000..64744afe7a
--- /dev/null
+++ b/modules/task/task.go
@@ -0,0 +1,66 @@
+// 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 (
+	"fmt"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/migrations/base"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+)
+
+// taskQueue is a global queue of tasks
+var taskQueue Queue
+
+// Run a task
+func Run(t *models.Task) error {
+	switch t.Type {
+	case structs.TaskTypeMigrateRepo:
+		return runMigrateTask(t)
+	default:
+		return fmt.Errorf("Unknow task type: %d", t.Type)
+	}
+}
+
+// Init will start the service to get all unfinished tasks and run them
+func Init() error {
+	switch setting.Task.QueueType {
+	case setting.ChannelQueueType:
+		taskQueue = NewChannelQueue(setting.Task.QueueLength)
+	case setting.RedisQueueType:
+		var err error
+		addrs, pass, idx, err := parseConnStr(setting.Task.QueueConnStr)
+		if err != nil {
+			return err
+		}
+		taskQueue, err = NewRedisQueue(addrs, pass, idx)
+		if err != nil {
+			return err
+		}
+	default:
+		return fmt.Errorf("Unsupported task queue type: %v", setting.Task.QueueType)
+	}
+
+	go func() {
+		if err := taskQueue.Run(); err != nil {
+			log.Error("taskQueue.Run end failed: %v", err)
+		}
+	}()
+
+	return nil
+}
+
+// MigrateRepository add migration repository to task
+func MigrateRepository(doer, u *models.User, opts base.MigrateOptions) error {
+	task, err := models.CreateMigrateTask(doer, u, opts)
+	if err != nil {
+		return err
+	}
+
+	return taskQueue.Push(task)
+}