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buffer.go
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buffer.go
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package trace
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"sync"
"github.com/markelog/trie"
"gitlab.com/gitlab-org/gitlab-runner/helpers"
)
const maskedText = "[MASKED]"
const defaultBytesLimit = 4 * 1024 * 1024 // 4MB
type Buffer struct {
writer io.WriteCloser
lock sync.RWMutex
logFile *os.File
logSize int
logWriter *bufio.Writer
advanceBuffer bytes.Buffer
bytesLimit int
finish chan struct{}
maskTree *trie.Trie
}
func (b *Buffer) SetMasked(values []string) {
if len(values) == 0 {
b.maskTree = nil
return
}
maskTree := trie.New()
for _, value := range values {
maskTree.Add(value, nil)
}
b.maskTree = maskTree
}
func (b *Buffer) SetLimit(size int) {
b.bytesLimit = size
}
func (b *Buffer) Size() int {
return b.logSize
}
func (b *Buffer) Reader(offset, n int) (io.ReadSeeker, error) {
b.lock.Lock()
defer b.lock.Unlock()
err := b.logWriter.Flush()
if err != nil {
return nil, err
}
return io.NewSectionReader(b.logFile, int64(offset), int64(n)), nil
}
func (b *Buffer) Bytes(offset, n int) ([]byte, error) {
reader, err := b.Reader(offset, n)
if err != nil {
return nil, err
}
return ioutil.ReadAll(reader)
}
func (b *Buffer) Write(data []byte) (n int, err error) {
return b.writer.Write(data)
}
func (b *Buffer) Finish() {
// wait for trace to finish
b.writer.Close()
<-b.finish
}
func (b *Buffer) Close() {
_ = b.logFile.Close()
_ = os.Remove(b.logFile.Name())
}
func (b *Buffer) advanceAllUnsafe() error {
n, err := b.advanceBuffer.WriteTo(b.logWriter)
b.logSize += int(n)
return err
}
func (b *Buffer) advanceAll() {
b.lock.Lock()
defer b.lock.Unlock()
b.advanceAllUnsafe()
}
// advanceLogUnsafe is assumed to be run every character
func (b *Buffer) advanceLogUnsafe() error {
// advance all if no masking is enabled
if b.maskTree == nil {
return b.advanceAllUnsafe()
}
rest := b.advanceBuffer.String()
results := b.maskTree.Search(rest)
if len(results) == 0 {
// we can advance as no match was found
return b.advanceAllUnsafe()
}
// full match was found
if len(results) == 1 && results[0].Key == rest {
b.advanceBuffer.Reset()
b.advanceBuffer.WriteString(maskedText)
return b.advanceAllUnsafe()
}
// partial match, wait for more characters
return nil
}
func (b *Buffer) limitExceededMessage() string {
return fmt.Sprintf("\n%sJob's log exceeded limit of %v bytes.%s\n", helpers.ANSI_BOLD_RED, b.bytesLimit, helpers.ANSI_RESET)
}
func (b *Buffer) writeRune(r rune) error {
b.lock.Lock()
defer b.lock.Unlock()
// over trace limit
if b.logSize > b.bytesLimit {
return io.EOF
}
if _, err := b.advanceBuffer.WriteRune(r); err != nil {
return err
}
if err := b.advanceLogUnsafe(); err != nil {
return err
}
// under trace limit
if b.logSize <= b.bytesLimit {
return nil
}
b.advanceBuffer.Reset()
b.advanceBuffer.WriteString(b.limitExceededMessage())
return b.advanceAllUnsafe()
}
func (b *Buffer) process(pipe *io.PipeReader) {
defer pipe.Close()
reader := bufio.NewReader(pipe)
for {
r, s, err := reader.ReadRune()
if s <= 0 {
break
} else if err == nil {
b.writeRune(r)
} else {
// ignore invalid characters
continue
}
}
b.advanceAll()
close(b.finish)
}
func New() (*Buffer, error) {
logFile, err := ioutil.TempFile("", "trace")
if err != nil {
return nil, err
}
reader, writer := io.Pipe()
buffer := &Buffer{
writer: writer,
bytesLimit: defaultBytesLimit,
finish: make(chan struct{}),
logFile: logFile,
logWriter: bufio.NewWriter(logFile),
}
go buffer.process(reader)
return buffer, nil
}