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forgejo/models/dbfs/dbfile.go
Jason Song 4011821c94
Implement actions (#21937)
Close #13539.

Co-authored by: @lunny @appleboy @fuxiaohei and others.

Related projects:
- https://gitea.com/gitea/actions-proto-def
- https://gitea.com/gitea/actions-proto-go
- https://gitea.com/gitea/act
- https://gitea.com/gitea/act_runner

### Summary

The target of this PR is to bring a basic implementation of "Actions",
an internal CI/CD system of Gitea. That means even though it has been
merged, the state of the feature is **EXPERIMENTAL**, and please note
that:

- It is disabled by default;
- It shouldn't be used in a production environment currently;
- It shouldn't be used in a public Gitea instance currently;
- Breaking changes may be made before it's stable.

**Please comment on #13539 if you have any different product design
ideas**, all decisions reached there will be adopted here. But in this
PR, we don't talk about **naming, feature-creep or alternatives**.

### ⚠️ Breaking

`gitea-actions` will become a reserved user name. If a user with the
name already exists in the database, it is recommended to rename it.

### Some important reviews

- What is `DEFAULT_ACTIONS_URL` in `app.ini` for?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1055954954
- Why the api for runners is not under the normal `/api/v1` prefix?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1061173592
- Why DBFS?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1061301178
- Why ignore events triggered by `gitea-actions` bot?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1063254103
- Why there's no permission control for actions?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1090229868

### What it looks like

<details>

#### Manage runners

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205870657-c72f590e-2e08-4cd4-be7f-2e0abb299bbf.png">

#### List runs

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205872794-50fde990-2b45-48c1-a178-908e4ec5b627.png">


#### View logs

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205872501-9b7b9000-9542-4991-8f55-18ccdada77c3.png">



</details>

### How to try it

<details>

#### 1. Start Gitea

Clone this branch and [install from
source](https://docs.gitea.io/en-us/install-from-source).

Add additional configurations in `app.ini` to enable Actions:

```ini
[actions]
ENABLED = true
```

Start it.

If all is well, you'll see the management page of runners:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205877365-8e30a780-9b10-4154-b3e8-ee6c3cb35a59.png">


#### 2. Start runner

Clone the [act_runner](https://gitea.com/gitea/act_runner), and follow
the
[README](https://gitea.com/gitea/act_runner/src/branch/main/README.md)
to start it.

If all is well, you'll see a new runner has been added:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205878000-216f5937-e696-470d-b66c-8473987d91c3.png">

#### 3. Enable actions for a repo

Create a new repo or open an existing one, check the `Actions` checkbox
in settings and submit.

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205879705-53e09208-73c0-4b3e-a123-2dcf9aba4b9c.png">
<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205879383-23f3d08f-1a85-41dd-a8b3-54e2ee6453e8.png">

If all is well, you'll see a new tab "Actions":

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205881648-a8072d8c-5803-4d76-b8a8-9b2fb49516c1.png">

#### 4. Upload workflow files

Upload some workflow files to `.gitea/workflows/xxx.yaml`, you can
follow the [quickstart](https://docs.github.com/en/actions/quickstart)
of GitHub Actions. Yes, Gitea Actions is compatible with GitHub Actions
in most cases, you can use the same demo:

```yaml
name: GitHub Actions Demo
run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
on: [push]
jobs:
  Explore-GitHub-Actions:
    runs-on: ubuntu-latest
    steps:
      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
      - name: Check out repository code
        uses: actions/checkout@v3
      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
      - name: List files in the repository
        run: |
          ls ${{ github.workspace }}
      - run: echo "🍏 This job's status is ${{ job.status }}."
```

If all is well, you'll see a new run in `Actions` tab:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205884473-79a874bc-171b-4aaf-acd5-0241a45c3b53.png">

#### 5. Check the logs of jobs

Click a run and you'll see the logs:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205884800-994b0374-67f7-48ff-be9a-4c53f3141547.png">

#### 6. Go on

You can try more examples in [the
documents](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions)
of GitHub Actions, then you might find a lot of bugs.

Come on, PRs are welcome.

</details>

See also: [Feature Preview: Gitea
Actions](https://blog.gitea.io/2022/12/feature-preview-gitea-actions/)

---------

Co-authored-by: a1012112796 <1012112796@qq.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
2023-01-31 09:45:19 +08:00

357 lines
7.7 KiB
Go

// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package dbfs
import (
"context"
"errors"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"code.gitea.io/gitea/models/db"
)
var defaultFileBlockSize int64 = 32 * 1024
type File interface {
io.ReadWriteCloser
io.Seeker
}
type file struct {
ctx context.Context
metaID int64
fullPath string
blockSize int64
allowRead bool
allowWrite bool
offset int64
}
var _ File = (*file)(nil)
func (f *file) readAt(fileMeta *dbfsMeta, offset int64, p []byte) (n int, err error) {
if offset >= fileMeta.FileSize {
return 0, io.EOF
}
blobPos := int(offset % f.blockSize)
blobOffset := offset - int64(blobPos)
blobRemaining := int(f.blockSize) - blobPos
needRead := len(p)
if needRead > blobRemaining {
needRead = blobRemaining
}
if blobOffset+int64(blobPos)+int64(needRead) > fileMeta.FileSize {
needRead = int(fileMeta.FileSize - blobOffset - int64(blobPos))
}
if needRead <= 0 {
return 0, io.EOF
}
var fileData dbfsData
ok, err := db.GetEngine(f.ctx).Where("meta_id = ? AND blob_offset = ?", f.metaID, blobOffset).Get(&fileData)
if err != nil {
return 0, err
}
blobData := fileData.BlobData
if !ok {
blobData = nil
}
canCopy := len(blobData) - blobPos
if canCopy <= 0 {
canCopy = 0
}
realRead := needRead
if realRead > canCopy {
realRead = canCopy
}
if realRead > 0 {
copy(p[:realRead], fileData.BlobData[blobPos:blobPos+realRead])
}
for i := realRead; i < needRead; i++ {
p[i] = 0
}
return needRead, nil
}
func (f *file) Read(p []byte) (n int, err error) {
if f.metaID == 0 || !f.allowRead {
return 0, os.ErrInvalid
}
fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
if err != nil {
return 0, err
}
n, err = f.readAt(fileMeta, f.offset, p)
f.offset += int64(n)
return n, err
}
func (f *file) Write(p []byte) (n int, err error) {
if f.metaID == 0 || !f.allowWrite {
return 0, os.ErrInvalid
}
fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
if err != nil {
return 0, err
}
needUpdateSize := false
written := 0
for len(p) > 0 {
blobPos := int(f.offset % f.blockSize)
blobOffset := f.offset - int64(blobPos)
blobRemaining := int(f.blockSize) - blobPos
needWrite := len(p)
if needWrite > blobRemaining {
needWrite = blobRemaining
}
buf := make([]byte, f.blockSize)
readBytes, err := f.readAt(fileMeta, blobOffset, buf)
if err != nil && !errors.Is(err, io.EOF) {
return written, err
}
copy(buf[blobPos:blobPos+needWrite], p[:needWrite])
if blobPos+needWrite > readBytes {
buf = buf[:blobPos+needWrite]
} else {
buf = buf[:readBytes]
}
fileData := dbfsData{
MetaID: fileMeta.ID,
BlobOffset: blobOffset,
BlobData: buf,
}
if res, err := db.GetEngine(f.ctx).Exec("UPDATE dbfs_data SET revision=revision+1, blob_data=? WHERE meta_id=? AND blob_offset=?", buf, fileMeta.ID, blobOffset); err != nil {
return written, err
} else if updated, err := res.RowsAffected(); err != nil {
return written, err
} else if updated == 0 {
if _, err = db.GetEngine(f.ctx).Insert(&fileData); err != nil {
return written, err
}
}
written += needWrite
f.offset += int64(needWrite)
if f.offset > fileMeta.FileSize {
fileMeta.FileSize = f.offset
needUpdateSize = true
}
p = p[needWrite:]
}
fileMetaUpdate := dbfsMeta{
ModifyTimestamp: timeToFileTimestamp(time.Now()),
}
if needUpdateSize {
fileMetaUpdate.FileSize = f.offset
}
if _, err := db.GetEngine(f.ctx).ID(fileMeta.ID).Update(fileMetaUpdate); err != nil {
return written, err
}
return written, nil
}
func (f *file) Seek(n int64, whence int) (int64, error) {
if f.metaID == 0 {
return 0, os.ErrInvalid
}
newOffset := f.offset
switch whence {
case io.SeekStart:
newOffset = n
case io.SeekCurrent:
newOffset += n
case io.SeekEnd:
size, err := f.size()
if err != nil {
return f.offset, err
}
newOffset = size + n
default:
return f.offset, os.ErrInvalid
}
if newOffset < 0 {
return f.offset, os.ErrInvalid
}
f.offset = newOffset
return newOffset, nil
}
func (f *file) Close() error {
return nil
}
func timeToFileTimestamp(t time.Time) int64 {
return t.UnixMicro()
}
func (f *file) loadMetaByPath() (*dbfsMeta, error) {
var fileMeta dbfsMeta
if ok, err := db.GetEngine(f.ctx).Where("full_path = ?", f.fullPath).Get(&fileMeta); err != nil {
return nil, err
} else if ok {
f.metaID = fileMeta.ID
f.blockSize = fileMeta.BlockSize
return &fileMeta, nil
}
return nil, nil
}
func (f *file) open(flag int) (err error) {
// see os.OpenFile for flag values
if flag&os.O_WRONLY != 0 {
f.allowWrite = true
} else if flag&os.O_RDWR != 0 {
f.allowRead = true
f.allowWrite = true
} else /* O_RDONLY */ {
f.allowRead = true
}
if f.allowWrite {
if flag&os.O_CREATE != 0 {
if flag&os.O_EXCL != 0 {
// file must not exist.
if f.metaID != 0 {
return os.ErrExist
}
} else {
// create a new file if none exists.
if f.metaID == 0 {
if err = f.createEmpty(); err != nil {
return err
}
}
}
}
if flag&os.O_TRUNC != 0 {
if err = f.truncate(); err != nil {
return err
}
}
if flag&os.O_APPEND != 0 {
if _, err = f.Seek(0, io.SeekEnd); err != nil {
return err
}
}
return nil
}
// read only mode
if f.metaID == 0 {
return os.ErrNotExist
}
return nil
}
func (f *file) createEmpty() error {
if f.metaID != 0 {
return os.ErrExist
}
now := time.Now()
_, err := db.GetEngine(f.ctx).Insert(&dbfsMeta{
FullPath: f.fullPath,
BlockSize: f.blockSize,
CreateTimestamp: timeToFileTimestamp(now),
ModifyTimestamp: timeToFileTimestamp(now),
})
if err != nil {
return err
}
if _, err = f.loadMetaByPath(); err != nil {
return err
}
return nil
}
func (f *file) truncate() error {
if f.metaID == 0 {
return os.ErrNotExist
}
return db.WithTx(f.ctx, func(ctx context.Context) error {
if _, err := db.GetEngine(ctx).Exec("UPDATE dbfs_meta SET file_size = 0 WHERE id = ?", f.metaID); err != nil {
return err
}
if _, err := db.GetEngine(ctx).Delete(&dbfsData{MetaID: f.metaID}); err != nil {
return err
}
return nil
})
}
func (f *file) renameTo(newPath string) error {
if f.metaID == 0 {
return os.ErrNotExist
}
newPath = buildPath(newPath)
return db.WithTx(f.ctx, func(ctx context.Context) error {
if _, err := db.GetEngine(ctx).Exec("UPDATE dbfs_meta SET full_path = ? WHERE id = ?", newPath, f.metaID); err != nil {
return err
}
return nil
})
}
func (f *file) delete() error {
if f.metaID == 0 {
return os.ErrNotExist
}
return db.WithTx(f.ctx, func(ctx context.Context) error {
if _, err := db.GetEngine(ctx).Delete(&dbfsMeta{ID: f.metaID}); err != nil {
return err
}
if _, err := db.GetEngine(ctx).Delete(&dbfsData{MetaID: f.metaID}); err != nil {
return err
}
return nil
})
}
func (f *file) size() (int64, error) {
if f.metaID == 0 {
return 0, os.ErrNotExist
}
fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
if err != nil {
return 0, err
}
return fileMeta.FileSize, nil
}
func findFileMetaByID(ctx context.Context, metaID int64) (*dbfsMeta, error) {
var fileMeta dbfsMeta
if ok, err := db.GetEngine(ctx).Where("id = ?", metaID).Get(&fileMeta); err != nil {
return nil, err
} else if ok {
return &fileMeta, nil
}
return nil, nil
}
func buildPath(path string) string {
path = filepath.Clean(path)
path = strings.ReplaceAll(path, "\\", "/")
path = strings.TrimPrefix(path, "/")
return strconv.Itoa(strings.Count(path, "/")) + ":" + path
}
func newDbFile(ctx context.Context, path string) (*file, error) {
path = buildPath(path)
f := &file{ctx: ctx, fullPath: path, blockSize: defaultFileBlockSize}
if _, err := f.loadMetaByPath(); err != nil {
return nil, err
}
return f, nil
}