mirror of
https://github.com/go-gitea/gitea
synced 2024-08-22 10:15:00 +02:00
Fix #25451. Bugfixes: - When stopping the zombie or endless tasks, set `LogInStorage` to true after transferring the file to storage. It was missing, it could write to a nonexistent file in DBFS because `LogInStorage` was false. - Always update `ActionTask.Updated` when there's a new state reported by the runner, even if there's no change. This is to avoid the task being judged as a zombie task. Enhancement: - Support `Stat()` for DBFS file. - `WriteLogs` refuses to write if it could result in content holes. --------- Co-authored-by: Giteabot <teabot@gitea.io>
376 lines
8 KiB
Go
376 lines
8 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package dbfs
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import (
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"context"
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"errors"
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"io"
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"io/fs"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"code.gitea.io/gitea/models/db"
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)
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var defaultFileBlockSize int64 = 32 * 1024
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type File interface {
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io.ReadWriteCloser
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io.Seeker
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fs.File
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}
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type file struct {
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ctx context.Context
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metaID int64
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fullPath string
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blockSize int64
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allowRead bool
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allowWrite bool
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offset int64
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}
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var _ File = (*file)(nil)
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func (f *file) readAt(fileMeta *dbfsMeta, offset int64, p []byte) (n int, err error) {
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if offset >= fileMeta.FileSize {
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return 0, io.EOF
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}
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blobPos := int(offset % f.blockSize)
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blobOffset := offset - int64(blobPos)
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blobRemaining := int(f.blockSize) - blobPos
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needRead := len(p)
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if needRead > blobRemaining {
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needRead = blobRemaining
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}
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if blobOffset+int64(blobPos)+int64(needRead) > fileMeta.FileSize {
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needRead = int(fileMeta.FileSize - blobOffset - int64(blobPos))
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}
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if needRead <= 0 {
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return 0, io.EOF
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}
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var fileData dbfsData
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ok, err := db.GetEngine(f.ctx).Where("meta_id = ? AND blob_offset = ?", f.metaID, blobOffset).Get(&fileData)
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if err != nil {
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return 0, err
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}
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blobData := fileData.BlobData
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if !ok {
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blobData = nil
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}
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canCopy := len(blobData) - blobPos
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if canCopy <= 0 {
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canCopy = 0
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}
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realRead := needRead
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if realRead > canCopy {
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realRead = canCopy
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}
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if realRead > 0 {
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copy(p[:realRead], fileData.BlobData[blobPos:blobPos+realRead])
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}
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for i := realRead; i < needRead; i++ {
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p[i] = 0
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}
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return needRead, nil
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}
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func (f *file) Read(p []byte) (n int, err error) {
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if f.metaID == 0 || !f.allowRead {
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return 0, os.ErrInvalid
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}
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fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
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if err != nil {
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return 0, err
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}
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n, err = f.readAt(fileMeta, f.offset, p)
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f.offset += int64(n)
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return n, err
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}
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func (f *file) Write(p []byte) (n int, err error) {
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if f.metaID == 0 || !f.allowWrite {
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return 0, os.ErrInvalid
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}
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fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
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if err != nil {
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return 0, err
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}
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needUpdateSize := false
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written := 0
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for len(p) > 0 {
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blobPos := int(f.offset % f.blockSize)
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blobOffset := f.offset - int64(blobPos)
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blobRemaining := int(f.blockSize) - blobPos
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needWrite := len(p)
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if needWrite > blobRemaining {
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needWrite = blobRemaining
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}
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buf := make([]byte, f.blockSize)
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readBytes, err := f.readAt(fileMeta, blobOffset, buf)
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if err != nil && !errors.Is(err, io.EOF) {
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return written, err
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}
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copy(buf[blobPos:blobPos+needWrite], p[:needWrite])
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if blobPos+needWrite > readBytes {
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buf = buf[:blobPos+needWrite]
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} else {
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buf = buf[:readBytes]
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}
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fileData := dbfsData{
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MetaID: fileMeta.ID,
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BlobOffset: blobOffset,
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BlobData: buf,
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}
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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 {
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return written, err
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} else if updated, err := res.RowsAffected(); err != nil {
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return written, err
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} else if updated == 0 {
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if _, err = db.GetEngine(f.ctx).Insert(&fileData); err != nil {
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return written, err
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}
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}
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written += needWrite
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f.offset += int64(needWrite)
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if f.offset > fileMeta.FileSize {
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fileMeta.FileSize = f.offset
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needUpdateSize = true
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}
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p = p[needWrite:]
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}
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fileMetaUpdate := dbfsMeta{
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ModifyTimestamp: timeToFileTimestamp(time.Now()),
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}
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if needUpdateSize {
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fileMetaUpdate.FileSize = f.offset
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}
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if _, err := db.GetEngine(f.ctx).ID(fileMeta.ID).Update(fileMetaUpdate); err != nil {
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return written, err
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}
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return written, nil
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}
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func (f *file) Seek(n int64, whence int) (int64, error) {
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if f.metaID == 0 {
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return 0, os.ErrInvalid
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}
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newOffset := f.offset
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switch whence {
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case io.SeekStart:
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newOffset = n
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case io.SeekCurrent:
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newOffset += n
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case io.SeekEnd:
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size, err := f.size()
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if err != nil {
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return f.offset, err
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}
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newOffset = size + n
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default:
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return f.offset, os.ErrInvalid
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}
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if newOffset < 0 {
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return f.offset, os.ErrInvalid
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}
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f.offset = newOffset
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return newOffset, nil
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}
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func (f *file) Close() error {
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return nil
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}
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func (f *file) Stat() (os.FileInfo, error) {
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if f.metaID == 0 {
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return nil, os.ErrInvalid
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}
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fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
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if err != nil {
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return nil, err
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}
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return fileMeta, nil
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}
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func timeToFileTimestamp(t time.Time) int64 {
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return t.UnixMicro()
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}
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func fileTimestampToTime(timestamp int64) time.Time {
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return time.UnixMicro(timestamp)
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}
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func (f *file) loadMetaByPath() (*dbfsMeta, error) {
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var fileMeta dbfsMeta
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if ok, err := db.GetEngine(f.ctx).Where("full_path = ?", f.fullPath).Get(&fileMeta); err != nil {
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return nil, err
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} else if ok {
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f.metaID = fileMeta.ID
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f.blockSize = fileMeta.BlockSize
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return &fileMeta, nil
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}
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return nil, nil
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}
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func (f *file) open(flag int) (err error) {
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// see os.OpenFile for flag values
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if flag&os.O_WRONLY != 0 {
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f.allowWrite = true
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} else if flag&os.O_RDWR != 0 {
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f.allowRead = true
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f.allowWrite = true
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} else /* O_RDONLY */ {
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f.allowRead = true
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}
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if f.allowWrite {
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if flag&os.O_CREATE != 0 {
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if flag&os.O_EXCL != 0 {
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// file must not exist.
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if f.metaID != 0 {
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return os.ErrExist
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}
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} else {
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// create a new file if none exists.
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if f.metaID == 0 {
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if err = f.createEmpty(); err != nil {
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return err
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}
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}
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}
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}
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if flag&os.O_TRUNC != 0 {
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if err = f.truncate(); err != nil {
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return err
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}
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}
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if flag&os.O_APPEND != 0 {
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if _, err = f.Seek(0, io.SeekEnd); err != nil {
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return err
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}
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}
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return nil
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}
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// read only mode
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if f.metaID == 0 {
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return os.ErrNotExist
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}
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return nil
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}
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func (f *file) createEmpty() error {
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if f.metaID != 0 {
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return os.ErrExist
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}
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now := time.Now()
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_, err := db.GetEngine(f.ctx).Insert(&dbfsMeta{
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FullPath: f.fullPath,
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BlockSize: f.blockSize,
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CreateTimestamp: timeToFileTimestamp(now),
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ModifyTimestamp: timeToFileTimestamp(now),
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})
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if err != nil {
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return err
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}
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if _, err = f.loadMetaByPath(); err != nil {
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return err
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}
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return nil
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}
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func (f *file) truncate() error {
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if f.metaID == 0 {
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return os.ErrNotExist
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}
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return db.WithTx(f.ctx, func(ctx context.Context) error {
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if _, err := db.GetEngine(ctx).Exec("UPDATE dbfs_meta SET file_size = 0 WHERE id = ?", f.metaID); err != nil {
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return err
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}
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if _, err := db.GetEngine(ctx).Delete(&dbfsData{MetaID: f.metaID}); err != nil {
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return err
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}
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return nil
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})
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}
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func (f *file) renameTo(newPath string) error {
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if f.metaID == 0 {
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return os.ErrNotExist
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}
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newPath = buildPath(newPath)
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return db.WithTx(f.ctx, func(ctx context.Context) error {
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if _, err := db.GetEngine(ctx).Exec("UPDATE dbfs_meta SET full_path = ? WHERE id = ?", newPath, f.metaID); err != nil {
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return err
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}
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return nil
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})
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}
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func (f *file) delete() error {
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if f.metaID == 0 {
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return os.ErrNotExist
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}
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return db.WithTx(f.ctx, func(ctx context.Context) error {
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if _, err := db.GetEngine(ctx).Delete(&dbfsMeta{ID: f.metaID}); err != nil {
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return err
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}
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if _, err := db.GetEngine(ctx).Delete(&dbfsData{MetaID: f.metaID}); err != nil {
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return err
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}
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return nil
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})
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}
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func (f *file) size() (int64, error) {
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if f.metaID == 0 {
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return 0, os.ErrNotExist
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}
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fileMeta, err := findFileMetaByID(f.ctx, f.metaID)
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if err != nil {
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return 0, err
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}
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return fileMeta.FileSize, nil
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}
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func findFileMetaByID(ctx context.Context, metaID int64) (*dbfsMeta, error) {
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var fileMeta dbfsMeta
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if ok, err := db.GetEngine(ctx).Where("id = ?", metaID).Get(&fileMeta); err != nil {
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return nil, err
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} else if ok {
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return &fileMeta, nil
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}
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return nil, nil
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}
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func buildPath(path string) string {
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path = filepath.Clean(path)
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path = strings.ReplaceAll(path, "\\", "/")
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path = strings.TrimPrefix(path, "/")
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return strconv.Itoa(strings.Count(path, "/")) + ":" + path
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}
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func newDbFile(ctx context.Context, path string) (*file, error) {
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path = buildPath(path)
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f := &file{ctx: ctx, fullPath: path, blockSize: defaultFileBlockSize}
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if _, err := f.loadMetaByPath(); err != nil {
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return nil, err
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}
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return f, nil
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}
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