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Support IAsyncEnumerable returns in SignalR hubs#6791

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halter73 merged 7 commits into
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Feb 25, 2019
Merged

Support IAsyncEnumerable returns in SignalR hubs#6791
halter73 merged 7 commits into
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halter73/5357

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@halter73 halter73 commented Jan 17, 2019

I'm waiting for the dotnet SDK to get updated in this repo so I can target C# 8 in our test projects. I'll add tests once we have it.

#5357

@halter73 halter73 added the area-signalr Includes: SignalR clients and servers label Jan 17, 2019
JamesNK
JamesNK reviewed Jan 17, 2019
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Comment thread src/SignalR/server/Core/src/Internal/HubMethodDescriptor.cs Outdated
davidfowl
davidfowl reviewed Jan 17, 2019
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Comment thread src/SignalR/server/Core/src/Internal/AsyncEnumeratorAdapters.cs Outdated
JamesNK
JamesNK reviewed Jan 17, 2019
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Comment thread src/SignalR/server/Core/src/Internal/HubMethodDescriptor.cs Outdated
davidfowl
davidfowl reviewed Jan 17, 2019
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Comment thread src/SignalR/server/Core/src/Internal/DefaultHubDispatcher.cs Outdated
campersau
campersau reviewed Jan 18, 2019
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Comment thread src/SignalR/samples/SignalRSamples/wwwroot/streaming.html
@halter73 halter73 added the blocked The work on this issue is blocked due to some dependency label Feb 5, 2019
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halter73 commented Feb 5, 2019

Waiting on #7005

BrennanConroy
BrennanConroy approved these changes Feb 19, 2019
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Comment thread src/SignalR/server/Core/src/Internal/DefaultHubDispatcher.cs Outdated
@halter73 halter73 removed the blocked The work on this issue is blocked due to some dependency label Feb 20, 2019
@halter73 halter73 force-pushed the halter73/5357 branch 4 times, most recently from 97c134d to 522a741 Compare February 22, 2019 02:41
halter73
halter73 commented Feb 22, 2019
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Comment thread src/SignalR/server/Core/src/Internal/AsyncEnumerableAdapters.cs Outdated
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@halter73 halter73 Feb 22, 2019

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REVIEW: The reason we have to wrap IAsyncEnumerators with non-value-type generic parameters instead of just casting is because we iterate using await foreach which doesn't support flowing a CancellationToken through GetAsyncEnumerator. If we manually iterated over the enumerator, we could save ourselves wrapping in most cases.

So should we manually iterate instead of wrapping the GetAsyncEnumerator call?

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@halter73 halter73 Feb 22, 2019 •
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We are the only consumer of the IAsyncEnumerable<object> btw

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@BrennanConroy BrennanConroy Feb 25, 2019

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So we could loop over MoveNextAsync() manually and avoid the BoxedAsyncEnumerator? That sounds nice :D

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@davidfowl davidfowl Feb 26, 2019

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Yes we should optimize

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@halter73 halter73 Feb 26, 2019

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You could have said something before I merged. It was a while loop that manually called GetAsyncEnumerator/MoveNextAsync until you asked me to change it to await foreach @davidfowl 😆

I figured didn't care about the allocation since a bunch of other allocations happen in this code path anyway. I created #7960 to track this with an XS tag. If we want to change this, it's not difficult.

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@davidfowl davidfowl Feb 26, 2019

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I care, lets fix it in preview4. Assign it to yourself 😄

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@halter73 halter73 Feb 27, 2019

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I'm glad you care 😉

@halter73 halter73 force-pushed the halter73/5357 branch 2 times, most recently from 0d00933 to 31c46d8 Compare February 23, 2019 00:14
@halter73
Support IAsyncEnumerable returns in SignalR hubs
4de77e9
@halter73
Bah, Humbug!
a42fff6 
I was hoping  typeof(T).IsValueType would get evaluated during JIT
compilation which would allow for dead code elimination, but alas:
https://github.com/dotnet/corefx/issues/16217
@halter73
Add tests for hubs returning IAsyncEnumerable
dbfadd1 
- Allow hub methods to also return types implementing IAsyncEnumerable
@halter73
Prefer IAsyncEnumerable over ChannelReader if hub method return type …
ec694c7 
…is both
@halter73
Use async foreach to consume IAsyncEnumerable
41544a2 
- Flow CancellationToken to IAsyncEnumerable.GetAsyncEnumerator
@halter73
Use IAsyncEnumerable returned by ChannelReader.ReadAllAsync()
646060a
@halter73 halter73 merged commit 46fe595 into master Feb 25, 2019
@halter73 halter73 deleted the halter73/5357 branch February 25, 2019 23:08
@halter73 halter73 mentioned this pull request Feb 26, 2019
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@halter73 halter73 mentioned this pull request Feb 26, 2019
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@BrennanConroy BrennanConroy BrennanConroy approved these changes

@mikaelm12 mikaelm12 Awaiting requested review from mikaelm12

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