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, 240 insertions, 0 deletions

diff --git a/models/task.go b/models/task.go
new file mode 100644
index 0000000000..cb878d387c
--- /dev/null
+++ b/models/task.go
@@ -0,0 +1,240 @@
+// 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 models
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/migrations/base"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/builder"
+)
+
+// Task represents a task
+type Task struct {
+	ID             int64
+	DoerID         int64       `xorm:"index"` // operator
+	Doer           *User       `xorm:"-"`
+	OwnerID        int64       `xorm:"index"` // repo owner id, when creating, the repoID maybe zero
+	Owner          *User       `xorm:"-"`
+	RepoID         int64       `xorm:"index"`
+	Repo           *Repository `xorm:"-"`
+	Type           structs.TaskType
+	Status         structs.TaskStatus `xorm:"index"`
+	StartTime      timeutil.TimeStamp
+	EndTime        timeutil.TimeStamp
+	PayloadContent string             `xorm:"TEXT"`
+	Errors         string             `xorm:"TEXT"` // if task failed, saved the error reason
+	Created        timeutil.TimeStamp `xorm:"created"`
+}
+
+// LoadRepo loads repository of the task
+func (task *Task) LoadRepo() error {
+	return task.loadRepo(x)
+}
+
+func (task *Task) loadRepo(e Engine) error {
+	if task.Repo != nil {
+		return nil
+	}
+	var repo Repository
+	has, err := e.ID(task.RepoID).Get(&repo)
+	if err != nil {
+		return err
+	} else if !has {
+		return ErrRepoNotExist{
+			ID: task.RepoID,
+		}
+	}
+	task.Repo = &repo
+	return nil
+}
+
+// LoadDoer loads do user
+func (task *Task) LoadDoer() error {
+	if task.Doer != nil {
+		return nil
+	}
+
+	var doer User
+	has, err := x.ID(task.DoerID).Get(&doer)
+	if err != nil {
+		return err
+	} else if !has {
+		return ErrUserNotExist{
+			UID: task.DoerID,
+		}
+	}
+	task.Doer = &doer
+
+	return nil
+}
+
+// LoadOwner loads owner user
+func (task *Task) LoadOwner() error {
+	if task.Owner != nil {
+		return nil
+	}
+
+	var owner User
+	has, err := x.ID(task.OwnerID).Get(&owner)
+	if err != nil {
+		return err
+	} else if !has {
+		return ErrUserNotExist{
+			UID: task.OwnerID,
+		}
+	}
+	task.Owner = &owner
+
+	return nil
+}
+
+// UpdateCols updates some columns
+func (task *Task) UpdateCols(cols ...string) error {
+	_, err := x.ID(task.ID).Cols(cols...).Update(task)
+	return err
+}
+
+// MigrateConfig returns task config when migrate repository
+func (task *Task) MigrateConfig() (*structs.MigrateRepoOption, error) {
+	if task.Type == structs.TaskTypeMigrateRepo {
+		var opts structs.MigrateRepoOption
+		err := json.Unmarshal([]byte(task.PayloadContent), &opts)
+		if err != nil {
+			return nil, err
+		}
+		return &opts, nil
+	}
+	return nil, fmt.Errorf("Task type is %s, not Migrate Repo", task.Type.Name())
+}
+
+// ErrTaskDoesNotExist represents a "TaskDoesNotExist" kind of error.
+type ErrTaskDoesNotExist struct {
+	ID     int64
+	RepoID int64
+	Type   structs.TaskType
+}
+
+// IsErrTaskDoesNotExist checks if an error is a ErrTaskIsNotExist.
+func IsErrTaskDoesNotExist(err error) bool {
+	_, ok := err.(ErrTaskDoesNotExist)
+	return ok
+}
+
+func (err ErrTaskDoesNotExist) Error() string {
+	return fmt.Sprintf("task is not exist [id: %d, repo_id: %d, type: %d]",
+		err.ID, err.RepoID, err.Type)
+}
+
+// GetMigratingTask returns the migrating task by repo's id
+func GetMigratingTask(repoID int64) (*Task, error) {
+	var task = Task{
+		RepoID: repoID,
+		Type:   structs.TaskTypeMigrateRepo,
+	}
+	has, err := x.Get(&task)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrTaskDoesNotExist{0, repoID, task.Type}
+	}
+	return &task, nil
+}
+
+// FindTaskOptions find all tasks
+type FindTaskOptions struct {
+	Status int
+}
+
+// ToConds generates conditions for database operation.
+func (opts FindTaskOptions) ToConds() builder.Cond {
+	var cond = builder.NewCond()
+	if opts.Status >= 0 {
+		cond = cond.And(builder.Eq{"status": opts.Status})
+	}
+	return cond
+}
+
+// FindTasks find all tasks
+func FindTasks(opts FindTaskOptions) ([]*Task, error) {
+	var tasks = make([]*Task, 0, 10)
+	err := x.Where(opts.ToConds()).Find(&tasks)
+	return tasks, err
+}
+
+func createTask(e Engine, task *Task) error {
+	_, err := e.Insert(task)
+	return err
+}
+
+// CreateMigrateTask creates a migrate task
+func CreateMigrateTask(doer, u *User, opts base.MigrateOptions) (*Task, error) {
+	bs, err := json.Marshal(&opts)
+	if err != nil {
+		return nil, err
+	}
+
+	var task = Task{
+		DoerID:         doer.ID,
+		OwnerID:        u.ID,
+		Type:           structs.TaskTypeMigrateRepo,
+		Status:         structs.TaskStatusQueue,
+		PayloadContent: string(bs),
+	}
+
+	if err := createTask(x, &task); err != nil {
+		return nil, err
+	}
+
+	repo, err := CreateRepository(doer, u, CreateRepoOptions{
+		Name:        opts.RepoName,
+		Description: opts.Description,
+		OriginalURL: opts.CloneAddr,
+		IsPrivate:   opts.Private,
+		IsMirror:    opts.Mirror,
+		Status:      RepositoryBeingMigrated,
+	})
+	if err != nil {
+		task.EndTime = timeutil.TimeStampNow()
+		task.Status = structs.TaskStatusFailed
+		err2 := task.UpdateCols("end_time", "status")
+		if err2 != nil {
+			log.Error("UpdateCols Failed: %v", err2.Error())
+		}
+		return nil, err
+	}
+
+	task.RepoID = repo.ID
+	if err = task.UpdateCols("repo_id"); err != nil {
+		return nil, err
+	}
+
+	return &task, nil
+}
+
+// FinishMigrateTask updates database when migrate task finished
+func FinishMigrateTask(task *Task) error {
+	task.Status = structs.TaskStatusFinished
+	task.EndTime = timeutil.TimeStampNow()
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+	if _, err := sess.ID(task.ID).Cols("status", "end_time").Update(task); err != nil {
+		return err
+	}
+	task.Repo.Status = RepositoryReady
+	if _, err := sess.ID(task.RepoID).Cols("status").Update(task.Repo); err != nil {
+		return err
+	}
+
+	return sess.Commit()
+}