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forgejo/docs/content/doc/advanced/migrations.en-us.md
Lunny Xiao 08069dc465
Improve migrations to support migrating milestones/labels/issues/comments/pullrequests (#6290)
* add migrations

* fix package dependency

* fix lints

* implements migrations except pull requests

* add releases

* migrating releases

* fix bug

* fix lint

* fix migrate releases

* fix tests

* add rollback

* pull request migtations

* fix import

* fix go module vendor

* add tests for upload to gitea

* more migrate options

* fix swagger-check

* fix misspell

* add options on migration UI

* fix log error

* improve UI options on migrating

* add support for username password when migrating from github

* fix tests

* remove comments and fix migrate limitation

* improve error handles

* migrate API will also support migrate milestones/labels/issues/pulls/releases

* fix tests and remove unused codes

* add DownloaderFactory and docs about how to create a new Downloader

* fix misspell

* fix migration docs

* Add hints about migrate options on migration page

* fix tests
2019-05-07 09:12:51 +08:00

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---
date: "2019-04-15T17:29:00+08:00"
title: "Advanced: Migrations Interfaces"
slug: "migrations-interfaces"
weight: 30
toc: true
draft: false
menu:
sidebar:
parent: "advanced"
name: "Migrations Interfaces"
weight: 55
identifier: "migrations-interfaces"
---
# Migration Features
The new migration features were introduced in Gitea 1.9.0. It defines two interfaces to support migrating
repositories data from other git host platforms to gitea or, in the future migrating gitea data to other
git host platforms. Currently, only the migrations from github via APIv3 to Gitea is implemented.
First of all, Gitea defines some standard objects in packages `modules/migrations/base`. They are
`Repository`, `Milestone`, `Release`, `Label`, `Issue`, `Comment`, `PullRequest`.
## Downloader Interfaces
To migrate from a new git host platform, there are two steps to be updated.
- You should implement a `Downloader` which will get all kinds of repository informations.
- You should implement a `DownloaderFactory` which is used to detect if the URL matches and
create a Downloader.
- You'll need to register the `DownloaderFactory` via `RegisterDownloaderFactory` on init.
```Go
type Downloader interface {
GetRepoInfo() (*Repository, error)
GetMilestones() ([]*Milestone, error)
GetReleases() ([]*Release, error)
GetLabels() ([]*Label, error)
GetIssues(start, limit int) ([]*Issue, error)
GetComments(issueNumber int64) ([]*Comment, error)
GetPullRequests(start, limit int) ([]*PullRequest, error)
}
```
```Go
type DownloaderFactory interface {
Match(opts MigrateOptions) (bool, error)
New(opts MigrateOptions) (Downloader, error)
}
```
## Uploader Interface
Currently, only a `GiteaLocalUploader` is implemented, so we only save downloaded
data via this `Uploader` on the local Gitea instance. Other uploaders are not supported
and will be implemented in future.
```Go
// Uploader uploads all the informations
type Uploader interface {
CreateRepo(repo *Repository, includeWiki bool) error
CreateMilestone(milestone *Milestone) error
CreateRelease(release *Release) error
CreateLabel(label *Label) error
CreateIssue(issue *Issue) error
CreateComment(issueNumber int64, comment *Comment) error
CreatePullRequest(pr *PullRequest) error
Rollback() error
}
```