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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, migrations from Github, Gitlab and Gitea to Gitea is implemented.
-
-First of all, Gitea defines some standard objects in packages `modules/migrations/base`. They are
- `Repository`, `Milestone`, `Release`, `ReleaseAsset`, `Label`, `Issue`, `Comment`, `PullRequest`, `Reaction`, `Review`, `ReviewComment`.
-
-## 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 {
-	GetAsset(relTag string, relID, id int64) (io.ReadCloser, error)
-	SetContext(context.Context)
-	GetRepoInfo() (*Repository, error)
-	GetTopics() ([]string, error)
-	GetMilestones() ([]*Milestone, error)
-	GetReleases() ([]*Release, error)
-	GetLabels() ([]*Label, error)
-	GetIssues(page, perPage int) ([]*Issue, bool, error)
-	GetComments(issueNumber int64) ([]*Comment, error)
-	GetPullRequests(page, perPage int) ([]*PullRequest, bool, error)
-	GetReviews(pullRequestNumber int64) ([]*Review, error)
-}
-```
-
-```Go
-type DownloaderFactory interface {
-	New(ctx context.Context, opts MigrateOptions) (Downloader, error)
-	GitServiceType() structs.GitServiceType
-}
-```
-
-## 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 {
-	MaxBatchInsertSize(tp string) int
-	CreateRepo(repo *Repository, opts MigrateOptions) error
-	CreateTopics(topic ...string) error
-	CreateMilestones(milestones ...*Milestone) error
-	CreateReleases(downloader Downloader, releases ...*Release) error
-	SyncTags() error
-	CreateLabels(labels ...*Label) error
-	CreateIssues(issues ...*Issue) error
-	CreateComments(comments ...*Comment) error
-	CreatePullRequests(prs ...*PullRequest) error
-	CreateReviews(reviews ...*Review) error
-	Rollback() error
-	Close()
-}
-
-```