91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package agents
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/golang/glog"
|
|
|
|
cioutil "github.com/kubernetes-incubator/cri-containerd/pkg/ioutil"
|
|
)
|
|
|
|
const (
|
|
// delimiter used in CRI logging format.
|
|
delimiter = ' '
|
|
// eof is end-of-line.
|
|
eol = '\n'
|
|
// timestampFormat is the timestamp format used in CRI logging format.
|
|
timestampFormat = time.RFC3339Nano
|
|
// pipeBufSize is the system PIPE_BUF size, on linux it is 4096 bytes.
|
|
// POSIX.1 says that write less than PIPE_BUF is atmoic.
|
|
pipeBufSize = 4096
|
|
// bufSize is the size of the read buffer.
|
|
bufSize = pipeBufSize - len(timestampFormat) - len(Stdout) - 2 /*2 delimiter*/ - 1 /*eol*/
|
|
)
|
|
|
|
// NewDiscardLogger creates logger which discards all the input.
|
|
func NewDiscardLogger() io.WriteCloser {
|
|
return cioutil.NewNopWriteCloser(ioutil.Discard)
|
|
}
|
|
|
|
// NewCRILogger returns a write closer which redirect container log into
|
|
// log file, and decorate the log line into CRI defined format.
|
|
func NewCRILogger(path string, stream StreamType) (io.WriteCloser, error) {
|
|
glog.V(4).Infof("Start reading log file %q", path)
|
|
prc, pwc := io.Pipe()
|
|
f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0640)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open log file: %v", err)
|
|
}
|
|
go redirectLogs(path, prc, f, stream)
|
|
return pwc, nil
|
|
}
|
|
|
|
func redirectLogs(path string, rc io.ReadCloser, wc io.WriteCloser, stream StreamType) {
|
|
defer rc.Close()
|
|
defer wc.Close()
|
|
streamBytes := []byte(stream)
|
|
delimiterBytes := []byte{delimiter}
|
|
r := bufio.NewReaderSize(rc, bufSize)
|
|
for {
|
|
// TODO(random-liu): Better define CRI log format, and escape newline in log.
|
|
lineBytes, _, err := r.ReadLine()
|
|
if err == io.EOF {
|
|
glog.V(4).Infof("Finish redirecting log file %q", path)
|
|
return
|
|
}
|
|
if err != nil {
|
|
glog.Errorf("An error occurred when redirecting log file %q: %v", path, err)
|
|
return
|
|
}
|
|
timestampBytes := time.Now().AppendFormat(nil, time.RFC3339Nano)
|
|
data := bytes.Join([][]byte{timestampBytes, streamBytes, lineBytes}, delimiterBytes)
|
|
data = append(data, eol)
|
|
if _, err := wc.Write(data); err != nil {
|
|
glog.Errorf("Fail to write log line %q: %v", data, err)
|
|
}
|
|
// Continue on write error to drain the input.
|
|
}
|
|
}
|