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|
// Package jsonfilelog provides the default Logger implementation for
// Docker logging. This logger logs to files on the host server in the
// JSON format.
package jsonfilelog // import "github.com/docker/docker/daemon/logger/jsonfilelog"
import (
"bytes"
"encoding/json"
"fmt"
"strconv"
"sync"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/logger/jsonfilelog/jsonlog"
"github.com/docker/docker/daemon/logger/loggerutils"
units "github.com/docker/go-units"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// Name is the name of the file that the jsonlogger logs to.
const Name = "json-file"
// JSONFileLogger is Logger implementation for default Docker logging.
type JSONFileLogger struct {
mu sync.Mutex
closed bool
writer *loggerutils.LogFile
readers map[*logger.LogWatcher]struct{} // stores the active log followers
tag string // tag values requested by the user to log
}
func init() {
if err := logger.RegisterLogDriver(Name, New); err != nil {
logrus.Fatal(err)
}
if err := logger.RegisterLogOptValidator(Name, ValidateLogOpt); err != nil {
logrus.Fatal(err)
}
}
// New creates new JSONFileLogger which writes to filename passed in
// on given context.
func New(info logger.Info) (logger.Logger, error) {
var capval int64 = -1
if capacity, ok := info.Config["max-size"]; ok {
var err error
capval, err = units.FromHumanSize(capacity)
if err != nil {
return nil, err
}
if capval <= 0 {
return nil, fmt.Errorf("max-size must be a positive number")
}
}
var maxFiles = 1
if maxFileString, ok := info.Config["max-file"]; ok {
var err error
maxFiles, err = strconv.Atoi(maxFileString)
if err != nil {
return nil, err
}
if maxFiles < 1 {
return nil, fmt.Errorf("max-file cannot be less than 1")
}
}
var compress bool
if compressString, ok := info.Config["compress"]; ok {
var err error
compress, err = strconv.ParseBool(compressString)
if err != nil {
return nil, err
}
if compress && (maxFiles == 1 || capval == -1) {
return nil, fmt.Errorf("compress cannot be true when max-file is less than 2 or max-size is not set")
}
}
attrs, err := info.ExtraAttributes(nil)
if err != nil {
return nil, err
}
// no default template. only use a tag if the user asked for it
tag, err := loggerutils.ParseLogTag(info, "")
if err != nil {
return nil, err
}
if tag != "" {
attrs["tag"] = tag
}
var extra []byte
if len(attrs) > 0 {
var err error
extra, err = json.Marshal(attrs)
if err != nil {
return nil, err
}
}
buf := bytes.NewBuffer(nil)
marshalFunc := func(msg *logger.Message) ([]byte, error) {
if err := marshalMessage(msg, extra, buf); err != nil {
return nil, err
}
b := buf.Bytes()
buf.Reset()
return b, nil
}
writer, err := loggerutils.NewLogFile(info.LogPath, capval, maxFiles, compress, marshalFunc, decodeFunc, 0640, getTailReader)
if err != nil {
return nil, err
}
return &JSONFileLogger{
writer: writer,
readers: make(map[*logger.LogWatcher]struct{}),
tag: tag,
}, nil
}
// Log converts logger.Message to jsonlog.JSONLog and serializes it to file.
func (l *JSONFileLogger) Log(msg *logger.Message) error {
l.mu.Lock()
err := l.writer.WriteLogEntry(msg)
l.mu.Unlock()
return err
}
func marshalMessage(msg *logger.Message, extra json.RawMessage, buf *bytes.Buffer) error {
logLine := msg.Line
if msg.PLogMetaData == nil || (msg.PLogMetaData != nil && msg.PLogMetaData.Last) {
logLine = append(msg.Line, '\n')
}
err := (&jsonlog.JSONLogs{
Log: logLine,
Stream: msg.Source,
Created: msg.Timestamp,
RawAttrs: extra,
}).MarshalJSONBuf(buf)
if err != nil {
return errors.Wrap(err, "error writing log message to buffer")
}
err = buf.WriteByte('\n')
return errors.Wrap(err, "error finalizing log buffer")
}
// ValidateLogOpt looks for json specific log options max-file & max-size.
func ValidateLogOpt(cfg map[string]string) error {
for key := range cfg {
switch key {
case "max-file":
case "max-size":
case "compress":
case "labels":
case "labels-regex":
case "env":
case "env-regex":
case "tag":
default:
return fmt.Errorf("unknown log opt '%s' for json-file log driver", key)
}
}
return nil
}
// Close closes underlying file and signals all the readers
// that the logs producer is gone.
func (l *JSONFileLogger) Close() error {
l.mu.Lock()
l.closed = true
err := l.writer.Close()
for r := range l.readers {
r.ProducerGone()
delete(l.readers, r)
}
l.mu.Unlock()
return err
}
// Name returns name of this logger.
func (l *JSONFileLogger) Name() string {
return Name
}
|
