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gitea/docs/content/doc/advanced/migrations.en-us.md
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Gitea 2 Gitea migration (#12657)
* first draft

* update gitea sdk to 9e280adb4da

* adapt feat of updated sdk

* releases now works

* break the Reactions loop

* use convertGiteaLabel

* fix endless loop because paggination is not supported there !!!

* rename gitea local uploader files

* pagination can bite you in the ass

* Version Checks

* lint

* docs

* rename gitea sdk import to miss future conficts

* go-swagger: dont scan the sdk structs

* make sure gitea can shutdown gracefully

* make GetPullRequests and GetIssues similar

* rm useles

* Add Test: started ...

* ... add tests ...

* Add tests and Fixing things

* Workaround missing SHA

* Adapt: Ensure that all migration requests are cancellable
(714ab71ddc)

* LINT: fix misspells in test set

* adapt ListMergeRequestAwardEmoji

* update sdk

* Return error when creating giteadownloader failed

* update sdk

* adapt new sdk

* adopt new features

* check version before err

* adapt: 'migrate service type switch page'

* optimize

* Fix DefaultBranch

* impruve

* handle subPath

* fix test

* Fix ReviewCommentPosition

* test GetReviews

* add DefaultBranch int test set

* rm unused

* Update SDK to v0.13.0

* addopt sdk changes

* found better link

* format template

* Update Docs

* Update Gitea SDK (v0.13.1)
2020-10-14 07:06:00 +03:00

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Markdown

---
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()
}
```