diff --git a/local/pid/pidfile.go b/local/pid/pidfile.go
index db0ee4fd..b044c8a0 100644
--- a/local/pid/pidfile.go
+++ b/local/pid/pidfile.go
@@ -27,6 +27,7 @@ import (
"os"
"path/filepath"
"strings"
+ "sync"
"syscall"
"time"
@@ -49,6 +50,9 @@ type PidFile struct {
CustomName string `json:"name"`
path string
+
+ lwInit sync.Once // used to ensure that the log writer is only created once
+ lw io.WriteCloser // log writer, used to write logs to the log file
}
func New(dir string, args []string) *PidFile {
@@ -257,16 +261,34 @@ func (p *PidFile) LogReader() (io.ReadCloser, error) {
return r, nil
}
+// LogWriter returns a writer to write logs to the log file. It creates the log
+// file if it does not exist, and truncates it if it does. It is safe to call
+// this method multiple times, it will only create the log file once per process
+// lifetime: it is useful to have a single truncation (and thus a clean log
+// file) at the beginning of the process management but not to truncate the log
+// file when the process is restarted.
+// Please note this method might not return a writer even if the error is nil
+// (the error is returned only for the first call).
func (p *PidFile) LogWriter() (io.WriteCloser, error) {
- logFile := p.LogFile()
- if err := os.MkdirAll(filepath.Dir(logFile), 0755); err != nil {
- return nil, err
- }
- w, err := os.OpenFile(logFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
+ var err error
+
+ p.lwInit.Do(func() {
+ logFile := p.LogFile()
+ if err = errors.WithStack(os.MkdirAll(filepath.Dir(logFile), 0755)); err != nil {
+ return
+ }
+ p.lw, err = os.OpenFile(logFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
+ if err != nil {
+ err = errors.WithStack(err)
+ return
+ }
+ })
+
if err != nil {
return nil, err
}
- return w, nil
+
+ return p.lw, err
}
func (p *PidFile) Binary() string {
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