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Don't allocate for ResponseCookiesFeature #699

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Don't allocate for ResponseCookiesFeature #699

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benaadams
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@benaadams benaadams commented Sep 2, 2016 •
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  • Don't allocate ResponseCookiesFeature when not used
  • Don't allocate StringBuilder pool
  • Don't allocate StringBuilders
  • Don't allocate extra strings when constructing cookie string

Resolves #676

/cc @davidfowl @muratg @Tratcher @pakrym

@benaadams benaadams force-pushed the no-alloc-ResponseCookiesFeature- branch from d3c7782 to 668f574 Compare September 2, 2016 18:34
@benaadams benaadams mentioned this pull request Sep 2, 2016
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src/Microsoft.AspNetCore.Http/Features/ResponseCookiesFeature.cs
/// <see cref="IResponseCookiesFeature"/> and the <see cref="IHttpResponseFeature"/>.
/// </param>
/// <param name="builderPool">The <see cref="ObjectPool{T}"/>, if available.</param>
public ResponseCookiesFeature(IFeatureCollection features, ObjectPool<StringBuilder> builderPool)
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Side note: we can't remove public API (even if we change the behavior).

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Restored. Do I need to add back AppendToStringBuilder on SetCookieHeaderValue?

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Yes, it was public in v1.0

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Restored

@benaadams benaadams force-pushed the no-alloc-ResponseCookiesFeature- branch 2 times, most recently from 7d5188b to e8e4f7c Compare September 2, 2016 19:41
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Could also use string.Concat with a single string[] which would only be an allocation for the array as its quite efficient memory-wise.

Continually appending to the string is obv problematic, but the cookie is both known size and a known number of strings.

@muratg muratg added this to the 1.1.0 milestone Sep 7, 2016
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The string.concat option sounds like it's worth a try.

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pakrym commented Sep 30, 2016 •
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Would be 2 allocations, 1 for array another for string, I'm thinking about extracting inplace string formatting into a struct, it would look like

var isf = new InplaceStringFormatter();
isf.AppendLength(s1);
isf.AppendLength(s2);
isf.AppendLength(s3);
isf.AppendValue(s1);
isf.AppendValue(s2);
isf.AppendValue(s3);
var s= isf.ToString();

Could reuse it in #716 too.

This was referenced Sep 30, 2016
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pakrym commented Oct 3, 2016

@benaadams how do you feel about moving this PR to use dotnet/extensions#157 ?

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Yep

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Need to wait till stuff builds locally :-/

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pakrym commented Oct 6, 2016

@benaadams ping

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Still can't build

Errors in I:\Work\GitHub\HttpAbstractions\test\Microsoft.Net.Http.Headers.Tests\project.json
    Package Microsoft.Extensions.Testing.Abstractions 1.0.0-preview2-003121 is not compatible with netcoreapp1.0 (.NETCoreApp,Version=v1.0). Package Microsoft.Extensions.Testing.Abstractions 1.0.0-preview2-003121 supports:
      - net451 (.NETFramework,Version=v4.5.1)
      - netstandard1.6 (.NETStandard,Version=v1.6)
    One or more packages are incompatible with .NETCoreApp,Version=v1.0.

Etc

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Hmm, does that when I use ./build is ok in VS but can't run tests

@benaadams benaadams force-pushed the no-alloc-ResponseCookiesFeature- branch 2 times, most recently from babb29a to debeab2 Compare October 7, 2016 05:13
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@pakrym updated

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pakrym commented Oct 7, 2016

You have old version of dotnet sdk somewhere, check what dotnet.exe gets used because

    Package Microsoft.Extensions.Testing.Abstractions 1.0.0-preview2-003121 is not compatible with netcoreapp1.0 (.NETCoreApp,Version=v1.0). Package Microsoft.Extensions.Testing.Abstractions 1.0.0-preview2-003121 supports:
      - net451 (.NETFramework,Version=v4.5.1)
      - netstandard1.6 (.NETStandard,Version=v1.6)

was fixed long long time ago.

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pakrym commented Oct 7, 2016

4569653

@pakrym pakrym closed this Oct 7, 2016
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Is there a reason why the (Pooled)HttpContextFactory ctors taking an ObjectPoolProvider wasn't obsoleted with this PR?

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@benaadams @Tratcher @pakrym @khellang @muratg @dnfclas