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---
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date: "2019-04-15T17:29:00+08:00"
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title: "Advanced: Migrations Interfaces"
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slug: "migrations-interfaces"
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weight: 30
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toc: true
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draft: false
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menu:
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sidebar:
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parent: "advanced"
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name: "Migrations Interfaces"
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weight: 55
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identifier: "migrations-interfaces"
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---
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# Migration Features
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The new migration features were introduced in Gitea 1.9.0. It defines two interfaces to support migrating
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repositories data from other git host platforms to gitea or, in the future migrating gitea data to other
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git host platforms. Currently, migrations from Github, Gitlab and Gitea to Gitea is implemented.
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First of all, Gitea defines some standard objects in packages `modules/migrations/base`. They are
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`Repository`, `Milestone`, `Release`, `ReleaseAsset`, `Label`, `Issue`, `Comment`, `PullRequest`, `Reaction`, `Review`, `ReviewComment`.
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## Downloader Interfaces
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To migrate from a new git host platform, there are two steps to be updated.
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- You should implement a `Downloader` which will get all kinds of repository informations.
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- You should implement a `DownloaderFactory` which is used to detect if the URL matches and
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create a Downloader.
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- You'll need to register the `DownloaderFactory` via `RegisterDownloaderFactory` on init.
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```Go
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type Downloader interface {
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GetAsset(relTag string, relID, id int64) (io.ReadCloser, error)
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SetContext(context.Context)
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GetRepoInfo() (*Repository, error)
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GetTopics() ([]string, error)
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GetMilestones() ([]*Milestone, error)
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GetReleases() ([]*Release, error)
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GetLabels() ([]*Label, error)
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GetIssues(page, perPage int) ([]*Issue, bool, error)
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GetComments(issueNumber int64) ([]*Comment, error)
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GetPullRequests(page, perPage int) ([]*PullRequest, bool, error)
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GetReviews(pullRequestNumber int64) ([]*Review, error)
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}
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```
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```Go
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type DownloaderFactory interface {
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New(ctx context.Context, opts MigrateOptions) (Downloader, error)
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GitServiceType() structs.GitServiceType
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}
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```
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## Uploader Interface
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Currently, only a `GiteaLocalUploader` is implemented, so we only save downloaded
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data via this `Uploader` on the local Gitea instance. Other uploaders are not supported
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and will be implemented in future.
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```Go
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// Uploader uploads all the informations
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type Uploader interface {
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MaxBatchInsertSize(tp string) int
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CreateRepo(repo *Repository, opts MigrateOptions) error
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CreateTopics(topic ...string) error
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CreateMilestones(milestones ...*Milestone) error
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CreateReleases(downloader Downloader, releases ...*Release) error
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SyncTags() error
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CreateLabels(labels ...*Label) error
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CreateIssues(issues ...*Issue) error
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CreateComments(comments ...*Comment) error
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CreatePullRequests(prs ...*PullRequest) error
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CreateReviews(reviews ...*Review) error
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Rollback() error
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Close()
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}
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```
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