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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package attribute
import (
"bytes"
"context"
"fmt"
"os"
"path/filepath"
"time"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
)
// BatchChecker provides a reader for check-attribute content that can be long running
type BatchChecker struct {
attributesNum int
repo *git.Repository
stdinWriter *os.File
stdOut *nulSeparatedAttributeWriter
ctx context.Context
cancel context.CancelFunc
cmd *git.Command
}
// NewBatchChecker creates a check attribute reader for the current repository and provided commit ID
// If treeish is empty, then it will use current working directory, otherwise it will use the provided treeish on the bare repo
func NewBatchChecker(repo *git.Repository, treeish string, attributes []string) (checker *BatchChecker, returnedErr error) {
ctx, cancel := context.WithCancel(repo.Ctx)
defer func() {
if returnedErr != nil {
cancel()
}
}()
cmd, envs, cleanup, err := checkAttrCommand(repo, treeish, nil, attributes)
if err != nil {
return nil, err
}
defer func() {
if returnedErr != nil {
cleanup()
}
}()
cmd.AddArguments("--stdin")
checker = &BatchChecker{
attributesNum: len(attributes),
repo: repo,
ctx: ctx,
cmd: cmd,
cancel: func() {
cancel()
cleanup()
},
}
stdinReader, stdinWriter, err := os.Pipe()
if err != nil {
return nil, err
}
checker.stdinWriter = stdinWriter
lw := new(nulSeparatedAttributeWriter)
lw.attributes = make(chan attributeTriple, len(attributes))
lw.closed = make(chan struct{})
checker.stdOut = lw
go func() {
defer func() {
_ = stdinReader.Close()
_ = lw.Close()
}()
stdErr := new(bytes.Buffer)
err := cmd.Run(ctx, &git.RunOpts{
Env: envs,
Dir: repo.Path,
Stdin: stdinReader,
Stdout: lw,
Stderr: stdErr,
})
if err != nil && !git.IsErrCanceledOrKilled(err) {
log.Error("Attribute checker for commit %s exits with error: %v", treeish, err)
}
checker.cancel()
}()
return checker, nil
}
// CheckPath check attr for given path
func (c *BatchChecker) CheckPath(path string) (rs *Attributes, err error) {
defer func() {
if err != nil && err != c.ctx.Err() {
log.Error("Unexpected error when checking path %s in %s, error: %v", path, filepath.Base(c.repo.Path), err)
}
}()
select {
case <-c.ctx.Done():
return nil, c.ctx.Err()
default:
}
if _, err = c.stdinWriter.Write([]byte(path + "\x00")); err != nil {
defer c.Close()
return nil, err
}
reportTimeout := func() error {
stdOutClosed := false
select {
case <-c.stdOut.closed:
stdOutClosed = true
default:
}
debugMsg := fmt.Sprintf("check path %q in repo %q", path, filepath.Base(c.repo.Path))
debugMsg += fmt.Sprintf(", stdOut: tmp=%q, pos=%d, closed=%v", string(c.stdOut.tmp), c.stdOut.pos, stdOutClosed)
if c.cmd != nil {
debugMsg += fmt.Sprintf(", process state: %q", c.cmd.ProcessState())
}
_ = c.Close()
return fmt.Errorf("CheckPath timeout: %s", debugMsg)
}
rs = NewAttributes()
for i := 0; i < c.attributesNum; i++ {
select {
case <-time.After(5 * time.Second):
// there is no "hang" problem now. This code is just used to catch other potential problems.
return nil, reportTimeout()
case attr, ok := <-c.stdOut.ReadAttribute():
if !ok {
return nil, c.ctx.Err()
}
rs.m[attr.Attribute] = Attribute(attr.Value)
case <-c.ctx.Done():
return nil, c.ctx.Err()
}
}
return rs, nil
}
func (c *BatchChecker) Close() error {
c.cancel()
err := c.stdinWriter.Close()
return err
}
type attributeTriple struct {
Filename string
Attribute string
Value string
}
type nulSeparatedAttributeWriter struct {
tmp []byte
attributes chan attributeTriple
closed chan struct{}
working attributeTriple
pos int
}
func (wr *nulSeparatedAttributeWriter) Write(p []byte) (n int, err error) {
l, read := len(p), 0
nulIdx := bytes.IndexByte(p, '\x00')
for nulIdx >= 0 {
wr.tmp = append(wr.tmp, p[:nulIdx]...)
switch wr.pos {
case 0:
wr.working = attributeTriple{
Filename: string(wr.tmp),
}
case 1:
wr.working.Attribute = string(wr.tmp)
case 2:
wr.working.Value = string(wr.tmp)
}
wr.tmp = wr.tmp[:0]
wr.pos++
if wr.pos > 2 {
wr.attributes <- wr.working
wr.pos = 0
}
read += nulIdx + 1
if l > read {
p = p[nulIdx+1:]
nulIdx = bytes.IndexByte(p, '\x00')
} else {
return l, nil
}
}
wr.tmp = append(wr.tmp, p...)
return l, nil
}
func (wr *nulSeparatedAttributeWriter) ReadAttribute() <-chan attributeTriple {
return wr.attributes
}
func (wr *nulSeparatedAttributeWriter) Close() error {
select {
case <-wr.closed:
return nil
default:
}
close(wr.attributes)
close(wr.closed)
return nil
}
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