public void TryReplenishWithAllTokensAvailable_Noops()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
Assert.Equal(2, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.Equal(2, limiter.GetAvailablePermits());
}
public void TryReplenishWithAutoReplenish_ReturnsFalse()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.FromSeconds(1), 1, autoReplenishment: true));
Assert.Equal(2, limiter.GetAvailablePermits());
Assert.False(limiter.TryReplenish());
Assert.Equal(2, limiter.GetAvailablePermits());
}
public void TryReplenishHonorsTokensPerPeriod()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(7, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 3, autoReplenishment: false));
Assert.True(limiter.Acquire(5).IsAcquired);
Assert.False(limiter.Acquire(3).IsAcquired);
Assert.Equal(2, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.Equal(5, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.Equal(7, limiter.GetAvailablePermits());
}
public override async Task CanAcquireResourceAsync_QueuesAndGrabsNewest()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 3,
TimeSpan.FromMinutes(0), 1, autoReplenishment: false));
var lease = await limiter.WaitAsync(2);
Assert.True(lease.IsAcquired);
var wait1 = limiter.WaitAsync(2);
var wait2 = limiter.WaitAsync();
Assert.False(wait1.IsCompleted);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.True(limiter.TryReplenish());
// second queued item completes first with NewestFirst
lease = await wait2;
Assert.True(lease.IsAcquired);
Assert.False(wait1.IsCompleted);
lease.Dispose();
Assert.Equal(0, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.True(limiter.TryReplenish());
lease = await wait1;
Assert.True(lease.IsAcquired);
}
public override async Task CanAcquireResourceAsync_QueuesAndGrabsOldest()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 2,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = await limiter.WaitAsync();
Assert.True(lease.IsAcquired);
var wait1 = limiter.WaitAsync();
var wait2 = limiter.WaitAsync();
Assert.False(wait1.IsCompleted);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.True(limiter.TryReplenish());
lease = await wait1;
Assert.True(lease.IsAcquired);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.Equal(0, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
lease = await wait2;
Assert.True(lease.IsAcquired);
}
public override async Task CanAcquireResourcesWithWaitAsyncWithQueuedItemsIfNewestFirst()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 2,
TimeSpan.Zero, 2, autoReplenishment: false));
var lease = limiter.Acquire(1);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(2);
Assert.False(wait.IsCompleted);
Assert.Equal(1, limiter.GetAvailablePermits());
lease = await limiter.WaitAsync(1).DefaultTimeout();
Assert.True(lease.IsAcquired);
Assert.False(wait.IsCompleted);
limiter.TryReplenish();
lease = await wait.DefaultTimeout();
Assert.True(lease.IsAcquired);
}
public async Task AutoReplenish_ReplenishesTokens()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.FromMilliseconds(1000), 1, autoReplenishment: true));
Assert.Equal(2, limiter.GetAvailablePermits());
limiter.Acquire(2);
var lease = await limiter.WaitAsync(1);
Assert.True(lease.IsAcquired);
}
public override async Task CanCancelWaitAsyncBeforeQueuing()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire(1);
Assert.True(lease.IsAcquired);
var cts = new CancellationTokenSource();
cts.Cancel();
await Assert.ThrowsAsync <TaskCanceledException>(() => limiter.WaitAsync(1, cts.Token).AsTask());
lease.Dispose();
Assert.True(limiter.TryReplenish());
Assert.Equal(1, limiter.GetAvailablePermits());
}
public async Task ReplenishWorksWhenTicksWrap()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(10, QueueProcessingOrder.OldestFirst, 2,
TimeSpan.FromMilliseconds(2), 1, autoReplenishment: false));
var lease = limiter.Acquire(10);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
var replenishInternalMethod = typeof(TokenBucketRateLimiter).GetMethod("ReplenishInternal", Reflection.BindingFlags.NonPublic | Reflection.BindingFlags.Instance) !;
// This will set the last tick to the max value
replenishInternalMethod.Invoke(limiter, new object[] { uint.MaxValue });
lease = await wait;
Assert.True(lease.IsAcquired);
wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
// ticks wrapped, should replenish
replenishInternalMethod.Invoke(limiter, new object[] { 2U });
lease = await wait;
Assert.True(lease.IsAcquired);
replenishInternalMethod.Invoke(limiter, new object[] { uint.MaxValue });
wait = limiter.WaitAsync(2);
Assert.False(wait.IsCompleted);
// ticks wrapped, but only 1 millisecond passed, make sure the wrapping behaves correctly and replenish doesn't happen
replenishInternalMethod.Invoke(limiter, new object[] { 1U });
Assert.False(wait.IsCompleted);
Assert.Equal(1, limiter.GetAvailablePermits());
}
public async Task ReplenishWorksWhenTicksWrap()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(10, QueueProcessingOrder.OldestFirst, 2,
TimeSpan.FromMilliseconds(2), 1, autoReplenishment: false));
var lease = limiter.Acquire(10);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
// This will set the last tick to the max value
limiter.ReplenishInternal(uint.MaxValue);
lease = await wait.DefaultTimeout();
Assert.True(lease.IsAcquired);
wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
// ticks wrapped, should replenish
limiter.ReplenishInternal(2);
lease = await wait.DefaultTimeout();
Assert.True(lease.IsAcquired);
limiter.ReplenishInternal(uint.MaxValue);
wait = limiter.WaitAsync(2);
Assert.False(wait.IsCompleted);
// ticks wrapped, but only 1 millisecond passed, make sure the wrapping behaves correctly and replenish doesn't happen
limiter.ReplenishInternal(1);
Assert.False(wait.IsCompleted);
Assert.Equal(1, limiter.GetAvailablePermits());
}