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package loggers
import (
"context"
"fmt"
"sync"
"time"
)
type stdout struct {
pauseCh chan struct{}
resumeCh chan struct{}
mutex sync.Mutex
}
var _ Logger = (*stdout)(nil)
func newStdout() *stdout {
return &stdout{
pauseCh: make(chan struct{}),
resumeCh: make(chan struct{}),
}
}
func (s *stdout) Start(ctx context.Context, wg *sync.WaitGroup) {
wg.Done()
}
func (s *stdout) Log(now time.Time, message string) {
s.log(message, true)
}
func (s *stdout) LogWithColors(now time.Time, message, coloredMessage string) {
s.log(coloredMessage, true)
}
func (s *stdout) Raw(now time.Time, message string) {
s.log(message, false)
}
func (s *stdout) RawWithColors(now time.Time, message, coloredMessage string) {
s.log(coloredMessage, false)
}
func (s *stdout) log(message string, nl bool) {
s.mutex.Lock()
select {
case <-s.pauseCh:
// Wait for Resume without holding the mutex: the prompt path calls
// dlog after the user answers while Pause is still active; holding the
// mutex here would deadlock (Info blocks on Lock, Resume never runs).
s.mutex.Unlock()
<-s.resumeCh
s.mutex.Lock()
default:
}
defer s.mutex.Unlock()
if nl {
fmt.Println(message)
return
}
fmt.Print(message)
}
func (s *stdout) Pause() { s.pauseCh <- struct{}{} }
func (s *stdout) Resume() { s.resumeCh <- struct{}{} }
func (s *stdout) Flush() {
// This is empty because it isn't doing anything but has to satisfy the interface.
}
func (s *stdout) Rotate() {
// This is empty because it isn't doing anything but has to satisfy the interface.
}
func (*stdout) SupportsColors() bool { return true }
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