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|
package loggers
import (
"bufio"
"context"
"fmt"
"os"
"runtime"
"sync"
"time"
"github.com/mimecast/dtail/internal/config"
)
type fileMessageBuf struct {
now time.Time
message string
nl bool
}
type file struct {
bufferCh chan *fileMessageBuf
pauseCh chan struct{}
resumeCh chan struct{}
rotateCh chan struct{}
flushCh chan struct{}
fd *os.File
writer *bufio.Writer
mutex sync.Mutex
started bool
lastFileName string
strategy Strategy
}
func newFile(strategy Strategy) *file {
return &file{
bufferCh: make(chan *fileMessageBuf, runtime.NumCPU()*100),
pauseCh: make(chan struct{}),
resumeCh: make(chan struct{}),
rotateCh: make(chan struct{}),
flushCh: make(chan struct{}),
strategy: strategy,
}
}
func (f *file) Start(ctx context.Context, wg *sync.WaitGroup) {
f.mutex.Lock()
defer func() {
f.started = true
f.mutex.Unlock()
}()
if f.started {
// Logger already started from another Goroutine.
wg.Done()
return
}
pause := func(ctx context.Context) {
select {
case <-f.resumeCh:
return
case <-ctx.Done():
return
}
}
go func() {
defer wg.Done()
for {
select {
case m := <-f.bufferCh:
f.write(m)
case <-f.pauseCh:
pause(ctx)
case <-f.flushCh:
f.flush()
case <-ctx.Done():
f.flush()
f.fd.Close()
return
}
}
}()
}
func (f *file) Log(now time.Time, message string) {
f.bufferCh <- &fileMessageBuf{now, message, true}
}
func (f *file) LogWithColors(now time.Time, message, coloredMessage string) {
f.RawWithColors(now, message, coloredMessage)
}
func (f *file) Raw(now time.Time, message string) {
f.bufferCh <- &fileMessageBuf{now, message, false}
}
func (f *file) RawWithColors(now time.Time, message, coloredMessage string) {
panic("Colors not supported in file logger")
}
func (f *file) Pause() { f.pauseCh <- struct{}{} }
func (f *file) Resume() { f.resumeCh <- struct{}{} }
func (f *file) Flush() { f.flushCh <- struct{}{} }
func (f *file) Rotate() { f.rotateCh <- struct{}{} }
func (*file) SupportsColors() bool { return false }
func (f *file) write(m *fileMessageBuf) {
select {
case <-f.rotateCh:
// Force re-opening the outfile next time in getWriter.
f.lastFileName = ""
default:
}
var writer *bufio.Writer
if f.strategy.Rotation == DailyRotation {
writer = f.getWriter(m.now.Format("20060102"))
} else {
writer = f.getWriter(f.strategy.FileBase)
}
// Don't report any error, we won't be able to log it anyway!
_, _ = writer.WriteString(m.message)
if m.nl {
_ = writer.WriteByte('\n')
}
}
func (f *file) getWriter(name string) *bufio.Writer {
if f.lastFileName == name {
return f.writer
}
if _, err := os.Stat(config.Common.LogDir); os.IsNotExist(err) {
if err = os.MkdirAll(config.Common.LogDir, 0755); err != nil {
panic(err)
}
}
logFile := fmt.Sprintf("%s/%s.log", config.Common.LogDir, name)
newFd, err := os.OpenFile(logFile, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0666)
if err != nil {
panic(err)
}
// Close old writer.
if f.fd != nil {
f.writer.Flush()
f.fd.Close()
}
// Set new writer.
f.fd = newFd
f.writer = bufio.NewWriterSize(f.fd, 1)
f.lastFileName = name
return f.writer
}
func (f *file) flush() {
defer func() {
if f.writer != nil {
f.writer.Flush()
}
}()
for {
select {
case m := <-f.bufferCh:
f.write(m)
default:
return
}
}
}
|
