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package dlog
import (
"context"
"os"
"sync/atomic"
"testing"
"time"
)
// TestRotateLoopHandlesMultipleSignals is a regression test for a bug where
// rotateLoop returned after the first signal, so subsequent SIGHUPs were
// silently dropped. Sending two signals on rotateCh must result in two
// rotate() invocations before ctx is cancelled.
func TestRotateLoopHandlesMultipleSignals(t *testing.T) {
prev := Common
Common = &DLog{maxLevel: None}
t.Cleanup(func() { Common = prev })
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
rotateCh := make(chan os.Signal, 2)
var count int32
rotated := make(chan struct{}, 2)
rotate := func() {
atomic.AddInt32(&count, 1)
rotated <- struct{}{}
}
done := make(chan struct{})
go func() {
rotateLoop(ctx, rotateCh, rotate)
close(done)
}()
rotateCh <- os.Interrupt
waitForRotate(t, rotated, "first")
rotateCh <- os.Interrupt
waitForRotate(t, rotated, "second")
cancel()
select {
case <-done:
case <-time.After(2 * time.Second):
t.Fatal("rotateLoop did not return after ctx cancel")
}
if got := atomic.LoadInt32(&count); got != 2 {
t.Fatalf("rotate() called %d times, want 2", got)
}
}
func waitForRotate(t *testing.T, rotated <-chan struct{}, label string) {
t.Helper()
select {
case <-rotated:
case <-time.After(2 * time.Second):
t.Fatalf("rotate() was not invoked for %s signal", label)
}
}
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