System.IO.Compression.Brotli resolves incorrect brotli native libs

[suraciii]

I built my project in microsoft/aspnetcore-build:1.1.2, and deployed it in microsoft/aspnetcore:1.1.2.
Then an exception occurred after i triggered the brotili compression:

An unhandled exception occurred while processing the request.
DllNotFoundException: Unable to load DLL 'brotlienc.dll': The specified module could not be found.
(Exception from HRESULT: 0x8007007E)
System.IO.Compression.Interop+Brotli.BrotliEncoderCreateInstance(IntPtr allocFunc, IntPtr freeFunc, IntPtr opaque)

It seems that the OS conditional not work

Did i use the package wrong?

[ahsonkhan]

cc @shiftylogic
Any ideas to help resolve this issue?

[shiftylogic]

@csongysun Can you provide more detail on your development and deployment environments? Also, details on how you are deploying would be helpful.

[suraciii]

@shiftylogic
I use VS2017 on Win10 x64 for develop and debug, and deployed to docker for staging test.
Deployment details:

• OS: ubuntu 16.04
• Clone the project
• Use the microsoft/aspnetcore-build:1.1.2 for building project

docker run -it --rm -v=$(pwd):/src \
    -v=$HOME/.nuget/packages:$HOME/.nuget.packages \
    -w=/src/src/$arg microsoft/aspnetcore-build:1.1.2 \
    bash -c 'rm -rf ./obj && rm -rf ./bin  && dotnet restore --verbosity d && dotnet publish -c Release -o ./obj/Docker/publish'

• Build image from microsoft/aspnetcore:1.1.2

Dockerfile:

FROM microsoft/aspnetcore:1.1.2
ARG PROJECT
WORKDIR /app
COPY src/${PROJECT}/obj/Docker/publish .
RUN echo "dotnet ${PROJECT}.dll --urls http://*:80" > run.sh

• Docker run a container with the image

---

It would failed when it try to create a brotli stream:

System.DllNotFoundException: Unable to load DLL 'brotlienc.dll': The specified module could not be found.
(Exception from HRESULT: 0x8007007E)
at System.IO.Compression.Interop.Brotli.BrotliEncoderCreateInstance(IntPtr allocFunc, IntPtr freeFunc, IntPtr opaque)
at System.IO.Compression.BrotliNative.BrotliEncoderCreateInstance()
at System.IO.Compression.Brotli.State.InitializeEncoder()
at System.IO.Compression.BrotliStream..ctor(Stream baseStream, CompressionMode mode, Boolean leaveOpen, Int32 bufferSize)
at CNBlogs.Msg.Web.Compression.BrotliCompressionProvider.CreateStream(Stream outputStream) in /src/src/CNBlogs.Msg.Web/Compression/BrotliCompressionProvider.cs:line 17
at Microsoft.AspNetCore.ResponseCompression.BodyWrapperStream.OnWrite()

[shiftylogic]

@csongysun I see what is going on.

The library is a portable library but uses the build environment to determine what native library to load. This works fine in the CI system since we build and run everything on the target machine. However, the package that is uploaded to myget is built in a Windows environment. Though it has all the artifacts necessary to run on any platform, the determination to use the Windows dlls was made at compile time.

I'll look into a fix for this. Thanks for bringing it up.

If you want to workaround the issue for yourself in the short-term, you could build the package out of CoreFxLab via a Linux build environment and it should work for you.

[suraciii]

@shiftylogic Thanks for your help, I'll try to build a package for Linux environment.