func ExampleMutex() {
m, err := redsync.NewMutexWithGenericPool("FlyingSquirrels", pools)
if err != nil {
panic(err)
}
err = m.Lock()
if err != nil {
panic(err)
}
defer m.Unlock()
// Output:
}
func TestMutex(t *testing.T) {
done := make(chan bool)
chErr := make(chan error)
for i := 0; i < 4; i++ {
go func() {
m, err := redsync.NewMutexWithGenericPool("RedsyncMutex", pools)
if err != nil {
chErr <- err
return
}
f := 0
for j := 0; j < 32; j++ {
err := m.Lock()
if err == redsync.ErrFailed {
f++
if f > 2 {
chErr <- err
return
}
continue
}
if err != nil {
chErr <- err
return
}
time.Sleep(1 * time.Millisecond)
m.Unlock()
time.Sleep(time.Duration(rand.Int31n(128)) * time.Millisecond)
}
done <- true
}()
}
for i := 0; i < 4; i++ {
select {
case <-done:
case err := <-chErr:
t.Fatal(err)
}
}
}
// redMutexForTask vendors a configured redlock w/ randomness builtin for the expiration
// of the lock
func (r *RateLimiter) redMutexForTask(factor float64, delay int64) *redsync.Mutex {
// Grab the pool
redisPool := r.pool
nodes := []redsync.Pool{redisPool}
// Generate the mutex w/ token
redSyncToken := r.redlockToken()
redMutex, err := redsync.NewMutexWithGenericPool(redSyncToken, nodes)
if err != nil {
meshLog.Fatalf("Error creating RedMutex in limiter: %+v", err)
return nil
}
// Configure the mutex to have add sleep time randomness to its waiting. It was
// found in testing that w/ out this, the system locks in step w/ itself when not using
// a local pmutex. This is a danger for dist systems
redMutex.Tries = 10000
sleepTime := (rand.Float64() * factor * float64(delay)) + float64(delay)
redMutex.Delay = time.Duration(sleepTime) * time.Millisecond
redMutex.Expiry = 15 * time.Second
return redMutex
}
