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Have ShardingAdapter recursively call the underlying IMessageExtractor #7474

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Have ShardingAdapter recursively call the underlying IMessageExtractor #7474

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6ab91e4
Have `ShardingAdapter` recursively call the underlying `IMessageExtra…
Aaronontheweb Jan 17, 2025
bc420ef
Merge branch 'dev' into fix-7470-ShardingAdapter
Arkatufus Jan 17, 2025
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88 changes: 41 additions & 47 deletions src/contrib/cluster/Akka.Cluster.Sharding.Tests/AutomaticallyHandledExtractorMessagesSpec.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,16 +13,28 @@ namespace Akka.Cluster.Sharding.Tests;

public class AutomaticallyHandledExtractorMessagesSpec
{
public sealed record MyWrappedMessage(string EntityId, string Message);

// custom IMessageExtractor
public class MyMessageExtractor : IMessageExtractor
{
public string? EntityId(object message) => message switch
{
string s => s,
MyWrappedMessage wrapped => wrapped.EntityId,
_ => null
};

public object? EntityMessage(object message) => message;
public object? EntityMessage(object message)
{
switch (message)
{
case MyWrappedMessage wrapped:
return wrapped.Message;
default:
return message;
}
}

public string? ShardId(object message) => message switch
{
Expand All @@ -35,65 +47,47 @@ public string ShardId(string entityId, object? messageHint = null)
return entityId;
}
}

#pragma warning disable CS0618 // Type or member is obsolete
private ExtractEntityId ExtractEntityId = message =>
{
if (message is string s)
return (s, s);
return Option<(string, object)>.None;
};

private ExtractShardId ExtractShardId = message =>
{
if (message is string s)
return s;
return null!;
};
#pragma warning restore CS0618 // Type or member is obsolete
public static readonly TheoryData<(object shardingInput, object realMsg, string entityId, string shardId)>
Messages = new()
{
// (new ShardRegion.StartEntity("foo"), new ShardRegion.StartEntity("foo"), "foo", "foo"),
(new ShardingEnvelope("bar", "baz"), "baz", "bar", "bar"), ("bar", "bar", "bar", "bar"),
};

public static readonly TheoryData<(object shardingInput, object realMsg, string entityId, string shardId)> Messages = new()
{
// (new ShardRegion.StartEntity("foo"), new ShardRegion.StartEntity("foo"), "foo", "foo"),
(new ShardingEnvelope("bar", "baz"), "baz", "bar", "bar"),
("bar", "bar", "bar", "bar"),
};

[Theory]
[MemberData(nameof(Messages))]
public void ShouldAutomaticallyHandleMessagesInCustomIMessageExtractor((object shardingInput, object realMsg, string entityId, string shardId) data)
public void ShouldAutomaticallyHandleMessagesInCustomIMessageExtractor(
(object shardingInput, object realMsg, string entityId, string shardId) data)
{
// arrange
var extractor = new ExtractorAdapter(new MyMessageExtractor());

// act
var entityId = extractor.EntityId(data.shardingInput);
var entityMessage = extractor.EntityMessage(data.shardingInput);
var shardId = extractor.ShardId(entityId!, data.shardingInput);

// assert
entityId.Should().Be(data.entityId);
entityMessage.Should().Be(data.realMsg);
shardId.Should().Be(data.shardId);
}

// NOTE: so the old delegates are hopeless and will simply not work - you HAVE to handle the messages yourself there
// need to repeat of the previous test but using the deprecated delegate methods and the adapter
// [Theory]
// [MemberData(nameof(Messages))]
// public void ShouldAutomaticallyHandleMessagesInCustomIMessageExtractorUsingDelegates((object shardingInput, object realMsg, string entityId, string shardId) data)
// {
// // arrange
// var extractor = new ExtractorAdapter(new DeprecatedHandlerExtractorAdapter(ExtractEntityId, ExtractShardId));
//
// // act
// var entityId = extractor.EntityId(data.shardingInput);
// var entityMessage = extractor.EntityMessage(data.shardingInput);
// var shardId = extractor.ShardId(entityId!, data.shardingInput);
//
// // assert
// entityId.Should().Be(data.entityId);
// entityMessage.Should().Be(data.realMsg);
// shardId.Should().Be(data.shardId);
// }
}

[Fact]
public void ShouldUnwrapMessageInsideShardingEnvelope()
{
// arrange
var extractor = new ExtractorAdapter(new MyMessageExtractor());
var myMessage = new MyWrappedMessage("entity1", "hello");
var envelope = new ShardingEnvelope("entity1", myMessage);

// act
var entityId = extractor.EntityId(envelope);
var entityMessage = extractor.EntityMessage(envelope);

// assert
entityId.Should().Be("entity1");
entityMessage.Should().Be("hello");
}
}
2 changes: 1 addition & 1 deletion src/contrib/cluster/Akka.Cluster.Sharding/ClusterSharding.cs
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Expand Up @@ -76,7 +76,7 @@ public ExtractorAdapter(IMessageExtractor underlying)
{
return message switch
{
ShardingEnvelope se => se.Message,
ShardingEnvelope se => _underlying.EntityMessage(se.Message),
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Also call the underlying message extractor's EntityMessage method on the payload of the ShardingEnvelope, just in case that also needs unwrapping. This is needed in order to make sure that messages still work properly when using tools like Akka.Cluster.Sharding.Delivery, which uses the ShardingEnvelope heavily.

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Should we do a recursive search here instead, just to make doubly sure?

something in the line of

private object UnwrapShardingEnvelope(object message)
{
  object unwrapped = message;
  while(unwrapped is IWrappedMessage)
  {
    if(unwrapped is ShardingEnvelope)
      return unwrapped;
    unwrapped = unwrapped.Message;
  }
  return message;
}

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No because that's introducing side-effects the user is ultimately responsible for - we only care about the ShardingEnvelope specifically

_ => _underlying.EntityMessage(message)
};
}
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