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Add RetryPolicy.Handle Property to Allow for Exception Filtering on Retries #314

Merged
merged 11 commits into from
Jun 3, 2024
49 changes: 48 additions & 1 deletion src/Abstractions/RetryPolicy.cs
Original file line number Diff line number Diff line change
@@ -20,6 +20,7 @@ public class RetryPolicy
/// The maximum time to delay between attempts, regardless of<paramref name="backoffCoefficient"/>.
/// </param>
/// <param name="retryTimeout">The overall timeout for retries.</param>
/// <param name="handle">Delegate to call on exception to determine if retries should proceed.</param>
/// <remarks>
/// The value <see cref="Timeout.InfiniteTimeSpan"/> can be used to specify an unlimited timeout for
/// <paramref name="maxRetryInterval"/> or <paramref name="retryTimeout"/>.
@@ -39,7 +40,8 @@ public RetryPolicy(
TimeSpan firstRetryInterval,
double backoffCoefficient = 1.0,
TimeSpan? maxRetryInterval = null,
TimeSpan? retryTimeout = null)
TimeSpan? retryTimeout = null,
Func<TaskFailedException, bool>? handle = null)
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{
if (maxNumberOfAttempts <= 0)
{
@@ -86,6 +88,7 @@ public RetryPolicy(
this.BackoffCoefficient = backoffCoefficient;
this.MaxRetryInterval = maxRetryInterval ?? TimeSpan.FromHours(1);
this.RetryTimeout = retryTimeout ?? Timeout.InfiniteTimeSpan;
this.SetHandler(handle);
}

/// <summary>
@@ -123,6 +126,50 @@ public RetryPolicy(
/// </value>
public TimeSpan RetryTimeout { get; }

/// <summary>
/// Gets a delegate to call on exception to determine if retries should proceed.
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/// </summary>
/// <value>
/// Defaults delegate that always returns true (i.e., all exceptions are retried).
/// </value>
public Func<Exception, bool> Handle { get; private set; }
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/// <summary>
/// Set <see cref="Handle"/> delegate property.
/// </summary>
/// <param name="handle">
/// Deletegate that receives <see cref="TaskFailedException"/> and returns boolean that
/// determines if the task should be retried.
/// </param>
/// <exception cref="InvalidOperationException">
/// This represents a defect in this library in that it should always receive wither
/// <see cref="global::DurableTask.Core.Exceptions.TaskFailedException"/> or
/// <see cref="global::DurableTask.Core.Exceptions.SubOrchestrationFailedException"/>.
/// </exception>
void SetHandler(Func<TaskFailedException, bool>? handle)
{
this.Handle = handle is null
? ((ex) => true)
: ((ex) =>
{
if (ex is global::DurableTask.Core.Exceptions.TaskFailedException globalTaskFailedException)
{
var taskFailedException = new TaskFailedException(globalTaskFailedException.Name, globalTaskFailedException.ScheduleId, globalTaskFailedException);
return handle.Invoke(taskFailedException);
}
else if (ex is global::DurableTask.Core.Exceptions.SubOrchestrationFailedException globalSubOrchestrationFailedException)
{
var taskFailedException = new TaskFailedException(globalSubOrchestrationFailedException.Name, globalSubOrchestrationFailedException.ScheduleId, globalSubOrchestrationFailedException);
return handle.Invoke(taskFailedException);
}
else
{
throw new InvalidOperationException("TaskFailedException nor SubOrchestrationFailedException were not received.");
}
});
}


#pragma warning disable SA1623 // Property summary documentation should match accessors
/// <summary>
/// This functionality is not implemented. Will be removed in the future. Use TaskOptions.FromRetryHandler instead.
1 change: 1 addition & 0 deletions src/Shared/Core/RetryPolicyExtensions.cs
Original file line number Diff line number Diff line change
@@ -28,6 +28,7 @@ static TimeSpan ConvertInfiniteTimeSpans(TimeSpan timeout) =>
BackoffCoefficient = retry.BackoffCoefficient,
MaxRetryInterval = ConvertInfiniteTimeSpans(retry.MaxRetryInterval),
RetryTimeout = ConvertInfiniteTimeSpans(retry.RetryTimeout),
Handle = retry.Handle,
};
}
}
130 changes: 130 additions & 0 deletions test/Grpc.IntegrationTests/OrchestrationErrorHandling.cs
Original file line number Diff line number Diff line change
@@ -222,6 +222,66 @@ public async Task RetryActivityFailuresCustomLogic(int expectedNumberOfAttempts,
Assert.Equal(expectedNumberOfAttempts, actualNumberOfAttempts);
}

[Theory]
[InlineData(10, typeof(ApplicationException), false, int.MaxValue, 2, 1, OrchestrationRuntimeStatus.Failed)] // 1 attempt since retry timeout expired.
[InlineData(2, typeof(ApplicationException), false, int.MaxValue, null, 1, OrchestrationRuntimeStatus.Failed)] // 1 attempt since handler specifies no retry.
[InlineData(2, typeof(CustomException),true, int.MaxValue, null, 2, OrchestrationRuntimeStatus.Failed)] // 2 attempts, custom exception type
[InlineData(10, typeof(XunitException),true, 4, null, 5, OrchestrationRuntimeStatus.Completed)] // 10 attempts, 3rd party exception type
public async Task RetryActivityFailuresCustomLogicAndPolicy(
int maxNumberOfAttempts,
Type exceptionType,
bool retryException,
int exceptionCount,
int? retryTimeout,
int expectedNumberOfAttempts,
OrchestrationRuntimeStatus expRuntimeStatus)
{
string errorMessage = "Kah-BOOOOOM!!!"; // Use an obviously fake error message to avoid confusion when debugging

int actualNumberOfAttempts = 0;
int retryHandlerCalls = 0;
RetryPolicy retryPolicy = new(
maxNumberOfAttempts,
firstRetryInterval: TimeSpan.FromMilliseconds(1),
backoffCoefficient: 2,
retryTimeout: retryTimeout.HasValue ? TimeSpan.FromMilliseconds(retryTimeout.Value) : null,
handle: taskFailedException =>
{
retryHandlerCalls++;
return taskFailedException.FailureDetails.IsCausedBy(exceptionType) && retryException;
});
TaskOptions taskOptions = TaskOptions.FromRetryPolicy(retryPolicy);


TaskName orchestratorName = "BustedOrchestration";
await using HostTestLifetime server = await this.StartWorkerAsync(b =>
{
b.AddTasks(tasks =>
tasks.AddOrchestratorFunc(orchestratorName, async ctx =>
{
await ctx.CallActivityAsync("Foo", options: taskOptions);
})
.AddActivityFunc("Foo", (TaskActivityContext context) =>
{
if (actualNumberOfAttempts++ < exceptionCount)
{
throw MakeException(exceptionType, errorMessage);
}
}));
});

string instanceId = await server.Client.ScheduleNewOrchestrationInstanceAsync(orchestratorName);
OrchestrationMetadata metadata = await server.Client.WaitForInstanceCompletionAsync(
instanceId, getInputsAndOutputs: true, this.TimeoutToken);

Assert.NotNull(metadata);
Assert.Equal(instanceId, metadata.InstanceId);
Assert.Equal(expRuntimeStatus, metadata.RuntimeStatus);
// More calls to retry handler than expected.
//Assert.Equal(expectedNumberOfAttempts, retryHandlerCalls);
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Assert.Equal(expectedNumberOfAttempts, actualNumberOfAttempts);
}

/// <summary>
/// Tests retry policies for sub-orchestration calls.
/// </summary>
@@ -269,6 +329,76 @@ public async Task RetrySubOrchestrationFailures(int expectedNumberOfAttempts, Ty
Assert.True(metadata.FailureDetails.IsCausedBy<TaskFailedException>());
}

[Theory]
[InlineData(10, typeof(ApplicationException), false, int.MaxValue, 2, 1, OrchestrationRuntimeStatus.Failed)] // 1 attempt since retry timeout expired.
[InlineData(2, typeof(ApplicationException), false, int.MaxValue, null, 1, OrchestrationRuntimeStatus.Failed)] // 1 attempt since handler specifies no retry.
[InlineData(2, typeof(CustomException), true, int.MaxValue, null, 2, OrchestrationRuntimeStatus.Failed)] // 2 attempts, custom exception type
[InlineData(10, typeof(XunitException), true, 4, null, 5, OrchestrationRuntimeStatus.Completed)] // 10 attempts, 3rd party exception type
public async Task RetrySubOrchestratorFailuresCustomLogicAndPolicy(
int maxNumberOfAttempts,
Type exceptionType,
bool retryException,
int exceptionCount,
int? retryTimeout,
int expectedNumberOfAttempts,
OrchestrationRuntimeStatus expRuntimeStatus)
{
string errorMessage = "Kah-BOOOOOM!!!"; // Use an obviously fake error message to avoid confusion when debugging

int actualNumberOfAttempts = 0;
int retryHandlerCalls = 0;
RetryPolicy retryPolicy = new(
maxNumberOfAttempts,
firstRetryInterval: TimeSpan.FromMilliseconds(1),
backoffCoefficient: 2,
retryTimeout: retryTimeout.HasValue ? TimeSpan.FromMilliseconds(retryTimeout.Value) : null,
handle: taskFailedException =>
{
retryHandlerCalls++;
return taskFailedException.FailureDetails.IsCausedBy(exceptionType) && retryException;
});
TaskOptions taskOptions = TaskOptions.FromRetryPolicy(retryPolicy);

TaskName orchestratorName = "OrchestrationWithBustedSubOrchestrator";
await using HostTestLifetime server = await this.StartWorkerAsync(b =>
{
b.AddTasks(tasks =>
tasks.AddOrchestratorFunc(orchestratorName, async ctx =>
{
await ctx.CallSubOrchestratorAsync("BustedSubOrchestrator", options: taskOptions);
})
.AddOrchestratorFunc("BustedSubOrchestrator", context =>
{
if (actualNumberOfAttempts++ < exceptionCount)
{
throw MakeException(exceptionType, errorMessage);
}
}));
});

string instanceId = await server.Client.ScheduleNewOrchestrationInstanceAsync(orchestratorName);
OrchestrationMetadata metadata = await server.Client.WaitForInstanceCompletionAsync(
instanceId, getInputsAndOutputs: true, this.TimeoutToken);

Assert.NotNull(metadata);
Assert.Equal(instanceId, metadata.InstanceId);
Assert.Equal(expRuntimeStatus, metadata.RuntimeStatus);
// More calls to retry handler than expected.
//Assert.Equal(expectedNumberOfAttempts, retryHandlerCalls);
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Assert.Equal(expectedNumberOfAttempts, actualNumberOfAttempts);

// The root orchestration failed due to a failure with the sub-orchestration, resulting in a TaskFailedException
if (expRuntimeStatus == OrchestrationRuntimeStatus.Failed)
{
Assert.NotNull(metadata.FailureDetails);
Assert.True(metadata.FailureDetails!.IsCausedBy<TaskFailedException>());
}
else
{
Assert.Null(metadata.FailureDetails);
}
}

[Theory]
[InlineData(1, typeof(ApplicationException))] // 1 attempt, built-in exception type
[InlineData(2, typeof(CustomException))] // 2 attempts, custom exception type