public void TestFallbackMissing()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-K");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
CommandStreamTest.Command cmd = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.FAILURE, 20, HystrixEventType.FALLBACK_MISSING);
cmd.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.True(false, "Interrupted ex");
}
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(1L, stream.Latest.ErrorCount);
Assert.Equal(1L, stream.Latest.TotalRequests);
}
public void TestRequestFromCache()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-F");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
Command cmd1 = Command.From(groupKey, key, HystrixEventType.SUCCESS, 20);
Command cmd2 = Command.From(groupKey, key, HystrixEventType.RESPONSE_FROM_CACHE);
Command cmd3 = Command.From(groupKey, key, HystrixEventType.RESPONSE_FROM_CACHE);
cmd1.Observe();
cmd2.Observe();
cmd3.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.True(false, "Interrupted ex");
}
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(1L, stream.Latest.TotalRequests); // responses from cache should not show up here
}
public override void Dispose()
{
base.Dispose();
stream.Unsubscribe();
HealthCountsStream.Reset();
}
public async Task TestRequestFromCache()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-F");
var latch = new CountdownEvent(1);
var observer = new LatchedObserver(output, latch);
stream = HealthCountsStream.GetInstance(key, 10, 100);
var cmd1 = Command.From(GroupKey, key, HystrixEventType.SUCCESS, 0);
var cmd2 = Command.From(GroupKey, key, HystrixEventType.RESPONSE_FROM_CACHE);
var cmd3 = Command.From(GroupKey, key, HystrixEventType.RESPONSE_FROM_CACHE);
latchSubscription = stream.Observe().Subscribe(observer);
Assert.True(Time.WaitUntil(() => observer.StreamRunning, 1000), "Stream failed to start");
await cmd1.Observe();
await cmd2.Observe();
await cmd3.Observe();
Assert.True(WaitForLatchedObserverToUpdate(observer, 1, 500, output), "Latch took to long to update");
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(1L, stream.Latest.TotalRequests); // responses from cache should not show up here
}
public async Task TestMultipleEventsOverTimeGetStoredAndAgeOut()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-M");
var latch = new CountdownEvent(1);
var observer = new LatchedObserver(output, latch);
stream = HealthCountsStream.GetInstance(key, 10, 100);
var cmd1 = CommandStreamTest.Command.From(GroupKey, key, HystrixEventType.SUCCESS, 20);
var cmd2 = CommandStreamTest.Command.From(GroupKey, key, HystrixEventType.FAILURE, 10);
// by doing a take(30), we ensure that all rolling counts go back to 0
latchSubscription = stream.Observe().Take(30 + LatchedObserver.STABLE_TICK_COUNT).Subscribe(observer);
Assert.True(Time.WaitUntil(() => observer.StreamRunning, 1000), "Stream failed to start");
await cmd1.Observe();
await cmd2.Observe();
Assert.True(latch.Wait(10000), "CountdownEvent was not set!");
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(0L, stream.Latest.TotalRequests);
}
public void TestMultipleEventsOverTimeGetStoredAndAgeOut()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-M");
stream = HealthCountsStream.GetInstance(key, 10, 100);
// by doing a take(30), we ensure that all rolling counts go back to 0
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(30).Subscribe(new LatchedObserver(output, latch));
CommandStreamTest.Command cmd1 = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.SUCCESS, 20);
CommandStreamTest.Command cmd2 = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.FAILURE, 10);
cmd1.Observe();
cmd2.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.True(false, "Interrupted ex");
}
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(0L, stream.Latest.TotalRequests);
}
public async Task TestLowVolumeDoesNotTripCircuit()
{
var key = "cmd-I";
var sleepWindow = 400;
var lowVolume = 5;
HystrixCommand <bool> cmd1 = new FailureCommand(key, 0, sleepWindow, lowVolume);
var cb = cmd1._circuitBreaker;
var stream = HealthCountsStream.GetInstance(HystrixCommandKeyDefault.AsKey(key), cmd1.CommandOptions);
Assert.True(WaitForHealthCountToUpdate(key, 1000, output), "Health count stream failed to start");
// this should start as allowing requests
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
await cmd1.ExecuteAsync();
HystrixCommand <bool> cmd2 = new FailureCommand(key, 0, sleepWindow, lowVolume);
await cmd2.ExecuteAsync();
HystrixCommand <bool> cmd3 = new FailureCommand(key, 0, sleepWindow, lowVolume);
await cmd3.ExecuteAsync();
HystrixCommand <bool> cmd4 = new FailureCommand(key, 0, sleepWindow, lowVolume);
await cmd4.ExecuteAsync();
// Allow window to pass, even though it has all failed we won't trip the circuit because the volume is low
// Time.Wait(200);
Assert.True(WaitForHealthCountToUpdate(key, 250, output), "Health count stream failed to update");
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
}
public async Task TestTripCircuitOnTimeouts()
{
var key = "cmd-D";
HystrixCommand <bool> cmd1 = new TimeoutCommand(key);
var cb = cmd1._circuitBreaker;
var stream = HealthCountsStream.GetInstance(HystrixCommandKeyDefault.AsKey(key), cmd1.CommandOptions);
Assert.True(WaitForHealthCountToUpdate(key, 1000, output), "Health count stream failed to start");
// this should start as allowing requests
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
// success with high latency
await cmd1.ExecuteAsync();
HystrixCommand <bool> cmd2 = new TimeoutCommand(key);
await cmd2.ExecuteAsync();
HystrixCommand <bool> cmd3 = new TimeoutCommand(key);
await cmd3.ExecuteAsync();
HystrixCommand <bool> cmd4 = new TimeoutCommand(key);
await cmd4.ExecuteAsync();
// Allow window to pass, everything has been a timeout so we should not allow any requests
// Time.Wait(125);
Assert.True(WaitForHealthCountToUpdate(key, 250, output), "Health count stream failed to update");
Assert.False(cb.AllowRequest, "Request allowed when NOT expected!");
Assert.True(cb.IsOpen, "Circuit is closed when it should be open!");
}
public void TestSharedSourceStream()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-N");
stream = HealthCountsStream.GetInstance(key, 10, 100);
var latch = new CountdownEvent(1);
var allEqual = new AtomicBoolean(false);
var o1 = stream
.Observe()
.Take(10)
.ObserveOn(TaskPoolScheduler.Default);
var o2 = stream
.Observe()
.Take(10)
.ObserveOn(TaskPoolScheduler.Default);
var zipped = Observable.Zip(o1, o2, (healthCounts, healthCounts2) =>
{
return(healthCounts == healthCounts2); // we want object equality
});
var reduced = zipped.Aggregate(true, (a, b) =>
{
return(a && b);
}).Select(n => n);
var rdisp = reduced.Subscribe(
(b) =>
{
output.WriteLine(Time.CurrentTimeMillis + " : " + Thread.CurrentThread.ManagedThreadId + " Reduced OnNext : " + b);
allEqual.Value = b;
},
(e) =>
{
output.WriteLine(Time.CurrentTimeMillis + " : " + Thread.CurrentThread.ManagedThreadId + " Reduced OnError : " + e);
output.WriteLine(e.ToString());
latch.SignalEx();
},
() =>
{
output.WriteLine(Time.CurrentTimeMillis + " : " + Thread.CurrentThread.ManagedThreadId + " Reduced OnCompleted");
latch.SignalEx();
});
for (var i = 0; i < 10; i++)
{
HystrixCommand <int> cmd = Command.From(GroupKey, key, HystrixEventType.SUCCESS, 20);
cmd.Execute();
}
Assert.True(latch.Wait(10000), "CountdownEvent was not set!");
Assert.True(allEqual.Value);
rdisp.Dispose();
// we should be getting the same object from both streams. this ensures that multiple subscribers don't induce extra work
}
public override void Dispose()
{
latchSubscription?.Dispose();
stream?.Unsubscribe();
latchSubscription = null;
stream = null;
base.Dispose();
}
/* package */
internal void ResetStream()
{
lock (_syncLock)
{
healthCountsStream.Unsubscribe();
HealthCountsStream.RemoveByKey(key);
healthCountsStream = HealthCountsStream.GetInstance(key, properties);
}
}
public void TestSemaphoreRejected()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-H");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
// 10 commands will saturate semaphore when called from different threads.
// submit 2 more requests and they should be SEMAPHORE_REJECTED
// should see 10 SUCCESSes, 2 SEMAPHORE_REJECTED and 2 FALLBACK_SUCCESSes
List <Command> saturators = new List <Command>();
for (int i = 0; i < 10; i++)
{
saturators.Add(Command.From(groupKey, key, HystrixEventType.SUCCESS, 400, ExecutionIsolationStrategy.SEMAPHORE));
}
Command rejected1 = Command.From(groupKey, key, HystrixEventType.SUCCESS, 0, ExecutionIsolationStrategy.SEMAPHORE);
Command rejected2 = Command.From(groupKey, key, HystrixEventType.SUCCESS, 0, ExecutionIsolationStrategy.SEMAPHORE);
foreach (Command c in saturators)
{
new Thread(new ThreadStart(() => c.Observe())).Start();
}
try
{
Time.Wait(100);
}
catch (Exception ie)
{
Assert.True(false, ie.Message);
}
rejected1.Observe();
rejected2.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.True(false, "Interrupted ex");
}
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.True(rejected1.IsResponseSemaphoreRejected);
Assert.True(rejected2.IsResponseSemaphoreRejected);
// should only see failures here, not SHORT-CIRCUITS
Assert.Equal(2L, stream.Latest.ErrorCount);
Assert.Equal(12L, stream.Latest.TotalRequests);
}
/* package */
internal void ResetStream()
{
lock (_syncLock)
{
_healthCountsStream.Unsubscribe();
HealthCountsStream.RemoveByKey(CommandKey);
_healthCountsStream = HealthCountsStream.GetInstance(CommandKey, Properties);
}
}
public void TestThreadPoolRejected()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-I");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
// 10 commands will saturate threadpools when called concurrently.
// submit 2 more requests and they should be THREADPOOL_REJECTED
// should see 10 SUCCESSes, 2 THREADPOOL_REJECTED and 2 FALLBACK_SUCCESSes
List <CommandStreamTest.Command> saturators = new List <CommandStreamTest.Command>();
for (int i = 0; i < 10; i++)
{
saturators.Add(CommandStreamTest.Command.From(groupKey, key, HystrixEventType.SUCCESS, 400));
}
CommandStreamTest.Command rejected1 = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.SUCCESS, 0);
CommandStreamTest.Command rejected2 = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.SUCCESS, 0);
foreach (CommandStreamTest.Command saturator in saturators)
{
saturator.Observe();
}
try
{
Time.Wait(100);
}
catch (Exception ie)
{
Assert.True(false, ie.Message);
}
rejected1.Observe();
rejected2.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.False(true, "Interrupted ex");
}
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.True(rejected1.IsResponseThreadPoolRejected);
Assert.True(rejected2.IsResponseThreadPoolRejected);
Assert.Equal(2L, stream.Latest.ErrorCount);
Assert.Equal(12L, stream.Latest.TotalRequests);
}
public void TestFallbackRejection()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-L");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
//fallback semaphore size is 5. So let 5 commands saturate that semaphore, then
//let 2 more commands go to fallback. they should get rejected by the fallback-semaphore
List <CommandStreamTest.Command> fallbackSaturators = new List <CommandStreamTest.Command>();
for (int i = 0; i < 5; i++)
{
fallbackSaturators.Add(CommandStreamTest.Command.From(groupKey, key, HystrixEventType.FAILURE, 20, HystrixEventType.FALLBACK_SUCCESS, 400));
}
CommandStreamTest.Command rejection1 = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.FAILURE, 20, HystrixEventType.FALLBACK_SUCCESS, 0);
CommandStreamTest.Command rejection2 = CommandStreamTest.Command.From(groupKey, key, HystrixEventType.FAILURE, 20, HystrixEventType.FALLBACK_SUCCESS, 0);
foreach (CommandStreamTest.Command saturator in fallbackSaturators)
{
saturator.Observe();
}
try
{
Time.Wait(70);
}
catch (Exception ex)
{
Assert.True(false, ex.Message);
}
rejection1.Observe();
rejection2.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.True(false, "Interrupted ex");
}
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(7L, stream.Latest.ErrorCount);
Assert.Equal(7L, stream.Latest.TotalRequests);
}
public virtual bool WaitForHealthCountToUpdate(string commandKey, int numberOfUpdates, int maxTimeToWait, ITestOutputHelper output = null)
{
var stream = HealthCountsStream.GetInstance(commandKey);
if (stream == null)
{
return(false);
}
return(WaitForObservableToUpdate(stream.Observe(), numberOfUpdates, maxTimeToWait, output));
}
public async Task TestTripCircuitOnFailuresAboveThreshold()
{
var key = "cmd-B";
HystrixCommand <bool> cmd1 = new SuccessCommand(key, 0);
var cb = cmd1._circuitBreaker;
var stream = HealthCountsStream.GetInstance(HystrixCommandKeyDefault.AsKey(key), cmd1.CommandOptions);
Assert.True(WaitForHealthCountToUpdate(key, 1000, output), "Health count stream failed to start");
// this should start as allowing requests
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
// success with high latency
_ = await cmd1.ExecuteAsync();
HystrixCommand <bool> cmd2 = new SuccessCommand(key, 0);
_ = await cmd2.ExecuteAsync();
HystrixCommand <bool> cmd3 = new FailureCommand(key, 0);
_ = await cmd3.ExecuteAsync();
HystrixCommand <bool> cmd4 = new SuccessCommand(key, 0);
_ = await cmd4.ExecuteAsync();
HystrixCommand <bool> cmd5 = new FailureCommand(key, 0);
_ = await cmd5.ExecuteAsync();
HystrixCommand <bool> cmd6 = new SuccessCommand(key, 0);
_ = await cmd6.ExecuteAsync();
HystrixCommand <bool> cmd7 = new FailureCommand(key, 0);
_ = await cmd7.ExecuteAsync();
HystrixCommand <bool> cmd8 = new FailureCommand(key, 0);
_ = await cmd8.ExecuteAsync();
// Let window pass, this should trip the circuit as the error percentage is above the threshold
// Time.Wait(125);
Assert.True(WaitForHealthCountToUpdate(key, 250, output), "Health count stream failed to update");
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
output.WriteLine("Current CircuitBreaker Status : " + cmd1.Metrics.Healthcounts);
Assert.False(cb.AllowRequest, "Request allowed when NOT expected!");
Assert.True(cb.IsOpen, "Circuit is closed when it should be open!");
}
public void TestShortCircuited()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-G");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
// 3 failures in a row will trip circuit. let bucket roll once then submit 2 requests.
// should see 3 FAILUREs and 2 SHORT_CIRCUITs and then 5 FALLBACK_SUCCESSes
Command failure1 = Command.From(groupKey, key, HystrixEventType.FAILURE, 20);
Command failure2 = Command.From(groupKey, key, HystrixEventType.FAILURE, 20);
Command failure3 = Command.From(groupKey, key, HystrixEventType.FAILURE, 20);
Command shortCircuit1 = Command.From(groupKey, key, HystrixEventType.SUCCESS);
Command shortCircuit2 = Command.From(groupKey, key, HystrixEventType.SUCCESS);
failure1.Observe();
failure2.Observe();
failure3.Observe();
try
{
Time.Wait(500);
}
catch (Exception ie)
{
Assert.False(true, ie.Message);
}
shortCircuit1.Observe();
shortCircuit2.Observe();
try
{
Assert.True(latch.Wait(10000));
}
catch (Exception)
{
Assert.True(false, "Interrupted ex");
}
Assert.True(shortCircuit1.IsResponseShortCircuited);
Assert.True(shortCircuit2.IsResponseShortCircuited);
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
// should only see failures here, not SHORT-CIRCUITS
Assert.Equal(3L, stream.Latest.ErrorCount);
Assert.Equal(3L, stream.Latest.TotalRequests);
}
public void TestEmptyStreamProducesZeros()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-A");
var latch = new CountdownEvent(1);
var observer = new LatchedObserver(output, latch);
stream = HealthCountsStream.GetInstance(key, 10, 100);
latchSubscription = stream.Observe().Subscribe(observer);
Assert.True(Time.WaitUntil(() => observer.StreamRunning, 1000), "Stream failed to start");
Assert.True(WaitForLatchedObserverToUpdate(observer, 1, 500, output), "Latch took to long to update");
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(0L, stream.Latest.TotalRequests);
}
HystrixCommandMetrics(IHystrixCommandKey key, IHystrixCommandGroupKey commandGroup, IHystrixThreadPoolKey threadPoolKey, IHystrixCommandOptions properties, HystrixEventNotifier eventNotifier) : base(null)
{
this.key = key;
this.group = commandGroup;
this.threadPoolKey = threadPoolKey;
this.properties = properties;
healthCountsStream = HealthCountsStream.GetInstance(key, properties);
rollingCommandEventCounterStream = RollingCommandEventCounterStream.GetInstance(key, properties);
cumulativeCommandEventCounterStream = CumulativeCommandEventCounterStream.GetInstance(key, properties);
rollingCommandLatencyDistributionStream = RollingCommandLatencyDistributionStream.GetInstance(key, properties);
rollingCommandUserLatencyDistributionStream = RollingCommandUserLatencyDistributionStream.GetInstance(key, properties);
rollingCommandMaxConcurrencyStream = RollingCommandMaxConcurrencyStream.GetInstance(key, properties);
}
public static void ShutdownThreads()
{
CumulativeCommandEventCounterStream.Reset();
CumulativeThreadPoolEventCounterStream.Reset();
RollingCommandEventCounterStream.Reset();
RollingThreadPoolEventCounterStream.Reset();
RollingCollapserEventCounterStream.Reset();
RollingCollapserEventCounterStream.Reset();
HealthCountsStream.Reset();
RollingCollapserBatchSizeDistributionStream.Reset();
RollingCommandLatencyDistributionStream.Reset();
RollingCommandUserLatencyDistributionStream.Reset();
RollingCommandMaxConcurrencyStream.Reset();
RollingThreadPoolMaxConcurrencyStream.Reset();
}
public void TestEmptyStreamProducesZeros()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-A");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
// no writes
Assert.True(latch.Wait(10000), "CountdownEvent was not set!");
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(0L, stream.Latest.TotalRequests);
}
public async Task TestCircuitDoesNotTripOnFailuresBelowThreshold()
{
string key = "cmd-C";
HystrixCommand <bool> cmd1 = new SuccessCommand(key, 0);
ICircuitBreaker cb = cmd1._circuitBreaker;
var stream = HealthCountsStream.GetInstance(HystrixCommandKeyDefault.AsKey(key), cmd1.CommandOptions);
Assert.True(WaitForHealthCountToUpdate(key, 1000, output), "Health count stream failed to start");
// this should start as allowing requests
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
// success with high latency
await cmd1.ExecuteAsync();
HystrixCommand <bool> cmd2 = new SuccessCommand(key, 0);
await cmd2.ExecuteAsync();
HystrixCommand <bool> cmd3 = new FailureCommand(key, 0);
await cmd3.ExecuteAsync();
HystrixCommand <bool> cmd4 = new SuccessCommand(key, 0);
await cmd4.ExecuteAsync();
HystrixCommand <bool> cmd5 = new SuccessCommand(key, 0);
await cmd5.ExecuteAsync();
HystrixCommand <bool> cmd6 = new FailureCommand(key, 0);
await cmd6.ExecuteAsync();
HystrixCommand <bool> cmd7 = new SuccessCommand(key, 0);
await cmd7.ExecuteAsync();
HystrixCommand <bool> cmd8 = new FailureCommand(key, 0);
await cmd8.ExecuteAsync();
// Allow window to pass, this should remain closed as the failure threshold is below the percentage limit
// Time.Wait(125);
Assert.True(WaitForHealthCountToUpdate(key, 250, output), "Health count stream failed to update");
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
output.WriteLine("Current CircuitBreaker Status : " + cmd1.Metrics.Healthcounts);
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
}
internal static void Reset()
{
foreach (HystrixCommandMetrics metricsInstance in GetInstances())
{
metricsInstance.UnsubscribeAll();
}
RollingCommandEventCounterStream.Reset();
CumulativeCommandEventCounterStream.Reset();
RollingCommandLatencyDistributionStream.Reset();
RollingCommandUserLatencyDistributionStream.Reset();
RollingCommandMaxConcurrencyStream.Reset();
HystrixThreadEventStream.Reset();
HealthCountsStream.Reset();
Metrics.Clear();
}
public async Task TestTripCircuitOnTimeoutsAboveThreshold()
{
var key = "cmd-E";
HystrixCommand <bool> cmd1 = new SuccessCommand(key, 0);
var cb = cmd1._circuitBreaker;
var stream = HealthCountsStream.GetInstance(HystrixCommandKeyDefault.AsKey(key), cmd1.CommandOptions);
Assert.True(WaitForHealthCountToUpdate(key, 1000, output), "Health count stream failed to start");
// this should start as allowing requests
Assert.True(cb.AllowRequest, "Request NOT allowed when expected!");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
// success with high latency
HystrixCommand <bool> cmd2 = new SuccessCommand(key, 0);
HystrixCommand <bool> cmd3 = new TimeoutCommand(key);
HystrixCommand <bool> cmd4 = new SuccessCommand(key, 0);
HystrixCommand <bool> cmd5 = new TimeoutCommand(key);
HystrixCommand <bool> cmd6 = new TimeoutCommand(key);
HystrixCommand <bool> cmd7 = new SuccessCommand(key, 0);
HystrixCommand <bool> cmd8 = new TimeoutCommand(key);
HystrixCommand <bool> cmd9 = new TimeoutCommand(key);
var taskList = new List <Task>
{
cmd1.ExecuteAsync(),
cmd2.ExecuteAsync(),
cmd3.ExecuteAsync(),
cmd4.ExecuteAsync(),
cmd5.ExecuteAsync(),
cmd6.ExecuteAsync(),
cmd7.ExecuteAsync(),
cmd8.ExecuteAsync(),
cmd9.ExecuteAsync(),
};
await Task.WhenAll(taskList);
// Allow window to pass, this should trip the circuit as the error percentage is above the threshold
// Time.Wait(200);
Assert.True(WaitForHealthCountToUpdate(key, 250, output), "Health count stream failed to update");
output.WriteLine("ReqLog" + "@ " + Time.CurrentTimeMillis + " : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.False(cb.AllowRequest, "Request allowed when NOT expected!");
Assert.True(cb.IsOpen, "Circuit is closed when it should be open!");
}
public async Task TestSemaphoreRejected()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-H");
var saturators = new List <Command>();
var latch = new CountdownEvent(1);
var observer = new LatchedObserver(output, latch);
stream = HealthCountsStream.GetInstance(key, 10, 100);
for (var i = 0; i < 10; i++)
{
saturators.Add(Command.From(GroupKey, key, HystrixEventType.SUCCESS, 500, ExecutionIsolationStrategy.SEMAPHORE));
}
var rejected1 = Command.From(GroupKey, key, HystrixEventType.SUCCESS, 0, ExecutionIsolationStrategy.SEMAPHORE);
var rejected2 = Command.From(GroupKey, key, HystrixEventType.SUCCESS, 0, ExecutionIsolationStrategy.SEMAPHORE);
latchSubscription = stream.Observe().Subscribe(observer);
Assert.True(Time.WaitUntil(() => observer.StreamRunning, 1000), "Stream failed to start");
// 10 commands will saturate semaphore when called from different threads.
// submit 2 more requests and they should be SEMAPHORE_REJECTED
// should see 10 SUCCESSes, 2 SEMAPHORE_REJECTED and 2 FALLBACK_SUCCESSes
var tasks = new List <Task>();
foreach (var saturator in saturators)
{
tasks.Add(Task.Run(() => saturator.Execute()));
}
await Task.Delay(50);
tasks.Add(Task.Run(() => rejected1.Execute()));
tasks.Add(Task.Run(() => rejected2.Execute()));
Task.WaitAll(tasks.ToArray());
Assert.True(WaitForLatchedObserverToUpdate(observer, 1, 500, output), "Latch took to long to update");
Assert.True(rejected1.IsResponseSemaphoreRejected, "rejected1 not rejected");
Assert.True(rejected2.IsResponseSemaphoreRejected, "rejected2 not rejected");
// should only see failures here, not SHORT-CIRCUITS
Assert.Equal(2L, stream.Latest.ErrorCount);
Assert.Equal(12L, stream.Latest.TotalRequests);
}
public void TestSingleBadRequest()
{
IHystrixCommandKey key = HystrixCommandKeyDefault.AsKey("CMD-Health-E");
stream = HealthCountsStream.GetInstance(key, 10, 100);
CountdownEvent latch = new CountdownEvent(1);
stream.Observe().Take(10).Subscribe(new LatchedObserver(output, latch));
Command cmd = Command.From(groupKey, key, HystrixEventType.BAD_REQUEST);
cmd.Observe();
Assert.True(latch.Wait(10000), "CountdownEvent was not set!");
output.WriteLine("ReqLog : " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Assert.Equal(0L, stream.Latest.ErrorCount);
Assert.Equal(0L, stream.Latest.TotalRequests);
}
public async Task TestSingleTestOnOpenCircuitAfterTimeWindow()
{
var key = "cmd-F";
HystrixCommand <bool> cmd1 = new FailureCommand(key, 0);
var cb = cmd1._circuitBreaker;
var stream = HealthCountsStream.GetInstance(HystrixCommandKeyDefault.AsKey(key), cmd1.CommandOptions);
Assert.True(WaitForHealthCountToUpdate(key, 1000, output), "Health count stream failed to start");
// this should start as allowing requests
Assert.True(cb.AllowRequest, "Request NOT allowed when expected! (1)");
Assert.False(cb.IsOpen, "Circuit breaker is open when it should be closed!");
await cmd1.ExecuteAsync();
HystrixCommand <bool> cmd2 = new FailureCommand(key, 0);
await cmd2.ExecuteAsync();
HystrixCommand <bool> cmd3 = new FailureCommand(key, 0);
await cmd3.ExecuteAsync();
HystrixCommand <bool> cmd4 = new FailureCommand(key, 0);
await cmd4.ExecuteAsync();
// Allow window to pass, everything has failed in the test window so we should return false now
// Time.Wait(200);
Assert.True(WaitForHealthCountToUpdate(key, 250, output), "Health count stream failed to update");
Assert.False(cb.AllowRequest, "Request allowed when NOT expected!");
Assert.True(cb.IsOpen, "Circuit is closed when it should be open!");
// wait for sleepWindow to pass
Time.Wait(500);
// we should now allow 1 request
Assert.True(cb.AllowRequest, "Request NOT allowed when expected! (2)");
// but the circuit should still be open
Assert.True(cb.IsOpen, "Circuit is closed when it should be open! (2)");
// and further requests are still blocked
Assert.False(cb.AllowRequest, "Request allowed when NOT expected! (2)");
}
public async Task TestFallbackRejection()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-L");
var fallbackSaturators = new List <Command>();
var latch = new CountdownEvent(1);
var observer = new LatchedObserver(output, latch);
stream = HealthCountsStream.GetInstance(key, 10, 100);
for (var i = 0; i < 5; i++)
{
fallbackSaturators.Add(CommandStreamTest.Command.From(GroupKey, key, HystrixEventType.FAILURE, 0, HystrixEventType.FALLBACK_SUCCESS, 500));
}
var rejection1 = CommandStreamTest.Command.From(GroupKey, key, HystrixEventType.FAILURE, 0, HystrixEventType.FALLBACK_SUCCESS, 0);
var rejection2 = CommandStreamTest.Command.From(GroupKey, key, HystrixEventType.FAILURE, 0, HystrixEventType.FALLBACK_SUCCESS, 0);
latchSubscription = stream.Observe().Subscribe(observer);
Assert.True(Time.WaitUntil(() => observer.StreamRunning, 1000), "Stream failed to start");
// fallback semaphore size is 5. So let 5 commands saturate that semaphore, then
// let 2 more commands go to fallback. they should get rejected by the fallback-semaphore
var tasks = new List <Task>();
foreach (var saturator in fallbackSaturators)
{
tasks.Add(saturator.ExecuteAsync());
}
await Task.Delay(50);
output.WriteLine("ReqLog1 @ " + Time.CurrentTimeMillis + " " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
await Assert.ThrowsAsync <HystrixRuntimeException>(async() => await rejection1.Observe());
await Assert.ThrowsAsync <HystrixRuntimeException>(async() => await rejection2.Observe());
output.WriteLine("ReqLog2 @ " + Time.CurrentTimeMillis + " " + HystrixRequestLog.CurrentRequestLog.GetExecutedCommandsAsString());
Task.WaitAll(tasks.ToArray());
Assert.True(WaitForLatchedObserverToUpdate(observer, 1, 500, output), "Latch took to long to update");
Assert.Equal(7L, stream.Latest.ErrorCount);
Assert.Equal(7L, stream.Latest.TotalRequests);
}
public async Task TestShortCircuited()
{
var key = HystrixCommandKeyDefault.AsKey("CMD-Health-G");
var latch = new CountdownEvent(1);
var observer = new LatchedObserver(output, latch);
stream = HealthCountsStream.GetInstance(key, 10, 100);
var failure1 = Command.From(GroupKey, key, HystrixEventType.FAILURE, 0);
var failure2 = Command.From(GroupKey, key, HystrixEventType.FAILURE, 0);
var failure3 = Command.From(GroupKey, key, HystrixEventType.FAILURE, 0);
var shortCircuit1 = Command.From(GroupKey, key, HystrixEventType.SUCCESS);
var shortCircuit2 = Command.From(GroupKey, key, HystrixEventType.SUCCESS);
latchSubscription = stream.Observe().Subscribe(observer);
Assert.True(Time.WaitUntil(() => observer.StreamRunning, 1000), "Stream failed to start");
// 3 failures in a row will trip circuit. let bucket roll once then submit 2 requests.
// should see 3 FAILUREs and 2 SHORT_CIRCUITs and then 5 FALLBACK_SUCCESSes
await failure1.Observe();
await failure2.Observe();
await failure3.Observe();
output.WriteLine(Time.CurrentTimeMillis + " Waiting for health window to change");
Assert.True(WaitForLatchedObserverToUpdate(observer, 1, 500, output), "Latch took to long to update");
output.WriteLine(Time.CurrentTimeMillis + " Running short circuits");
await shortCircuit1.Observe();
await shortCircuit2.Observe();
Assert.True(WaitForLatchedObserverToUpdate(observer, 1, 500, output), "Latch took to long to update");
Assert.True(shortCircuit1.IsResponseShortCircuited);
Assert.True(shortCircuit2.IsResponseShortCircuited);
// should only see failures here, not SHORT-CIRCUITS
Assert.Equal(3L, stream.Latest.ErrorCount);
Assert.Equal(3L, stream.Latest.TotalRequests);
}
