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|
package logs
import (
"context"
"fmt"
"io"
"math"
"os"
"strconv"
"sync"
"time"
"github.com/armon/circbuf"
"github.com/moby/buildkit/client"
"github.com/moby/buildkit/identity"
"github.com/moby/buildkit/util/progress"
"github.com/pkg/errors"
"github.com/tonistiigi/units"
)
var defaultMaxLogSize = 2 * 1024 * 1024
var defaultMaxLogSpeed = 200 * 1024 // per second
const (
stdout = 1
stderr = 2
)
var configCheckOnce sync.Once
func NewLogStreams(ctx context.Context, printOutput bool) (io.WriteCloser, io.WriteCloser, func()) {
stdout := newStreamWriter(ctx, stdout, printOutput)
stderr := newStreamWriter(ctx, stderr, printOutput)
return stdout, stderr, func() {
stdout.flushBuffer()
stderr.flushBuffer()
}
}
func newStreamWriter(ctx context.Context, stream int, printOutput bool) *streamWriter {
pw, _, _ := progress.NewFromContext(ctx)
return &streamWriter{
pw: pw,
stream: stream,
printOutput: printOutput,
created: time.Now(),
}
}
type streamWriter struct {
pw progress.Writer
stream int
printOutput bool
created time.Time
size int
clipping bool
clipReasonSpeed bool
buf *circbuf.Buffer
}
func (sw *streamWriter) checkLimit(n int) int {
configCheckOnce.Do(func() {
maxLogSize, err := strconv.ParseInt(os.Getenv("BUILDKIT_STEP_LOG_MAX_SIZE"), 10, 32)
if err == nil {
defaultMaxLogSize = int(maxLogSize)
}
maxLogSpeed, err := strconv.ParseInt(os.Getenv("BUILDKIT_STEP_LOG_MAX_SPEED"), 10, 32)
if err == nil {
defaultMaxLogSpeed = int(maxLogSpeed)
}
})
oldSize := sw.size
sw.size += n
maxSize := -1
if defaultMaxLogSpeed != -1 {
maxSize = int(math.Ceil(time.Since(sw.created).Seconds())) * defaultMaxLogSpeed
sw.clipReasonSpeed = true
}
if maxSize == -1 || maxSize > defaultMaxLogSize {
maxSize = defaultMaxLogSize
sw.clipReasonSpeed = false
}
if maxSize != -1 {
if maxSize < oldSize {
return 0
}
if sw.size > maxSize {
return maxSize - oldSize
}
}
return n
}
func (sw *streamWriter) clipLimitMessage() string {
if sw.clipReasonSpeed {
return fmt.Sprintf("%#g/s", units.Bytes(defaultMaxLogSpeed))
}
return fmt.Sprintf("%#g", units.Bytes(defaultMaxLogSize))
}
func (sw *streamWriter) Write(dt []byte) (int, error) {
oldSize := len(dt)
limit := sw.checkLimit(len(dt))
if sw.buf == nil && limit < len(dt) {
var err error
sw.buf, err = circbuf.NewBuffer(256 * 1024)
if err != nil {
return 0, err
}
}
if sw.buf != nil {
sw.buf.Write(dt)
}
dt = append([]byte{}, dt[:limit]...)
if sw.clipping && oldSize == len(dt) {
sw.clipping = false
}
if !sw.clipping && oldSize != len(dt) {
dt = append(dt, []byte(fmt.Sprintf("\n[output clipped, log limit %s reached]\n", sw.clipLimitMessage()))...)
sw.clipping = true
}
_, err := sw.write(dt)
if err != nil {
return 0, err
}
return oldSize, nil
}
func (sw *streamWriter) write(dt []byte) (int, error) {
if len(dt) == 0 {
return 0, nil
}
sw.pw.Write(identity.NewID(), client.VertexLog{
Stream: sw.stream,
Data: dt,
})
if sw.printOutput {
switch sw.stream {
case 1:
return os.Stdout.Write(dt)
case 2:
return os.Stderr.Write(dt)
default:
return 0, errors.Errorf("invalid stream %d", sw.stream)
}
}
return len(dt), nil
}
func (sw *streamWriter) flushBuffer() {
if sw.buf == nil {
return
}
_, _ = sw.write(sw.buf.Bytes())
sw.buf = nil
}
func (sw *streamWriter) Close() error {
return sw.pw.Close()
}
func LoggerFromContext(ctx context.Context) func([]byte) {
return func(dt []byte) {
pw, _, _ := progress.NewFromContext(ctx)
defer pw.Close()
pw.Write(identity.NewID(), client.VertexLog{
Stream: stderr,
Data: []byte(dt),
})
}
}
|
