Building a simple Uno Platform application on AWS

[jeromelaban]

From Discord:

I'm building a simple Uno Platform application on AWS. I have everything setup and provisioned locally using dotnet SDK 6.0 on VS Code. But the project builds on Amplify fails at frontend. Here's the error message:

2022-12-23T03:32:59.392Z [INFO]: Build FAILED.
/usr/share/dotnet/sdk/3.1.416/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3971: The reference assemblies for ".NETFramework,Version=v5.0" were not found. You might be using an older .NET SDK to target .NET 5.0 or higher. Update Visual Studio and/or your .NET SDK. [/codebuild/output/src041914325/src/UnoWasmAWS/MyApp.Wasm/MyApp.Wasm.csproj]
0 Warning(s)
1 Error(s)

Any ideas :/

[jeromelaban]

This looks like you're not using the right .NET SDK for some reason (3.1.416 is being used).

How are you installing the .NET SDK ?

[davidconoh]

I have dotnet 6.0.4 installed on Linux Mint 20.3. Would probably do an upgrade but the idea is to have a sample Uno Wasm application up and running on AWS. I can comfortably build and deploy from the Skia.Gtk directory but I figured building for Wasm would require WinUI library which is not available on Linux. Here's the link to the repo: https://github.com/davidconoh/UnoWasmAWS.git/

[jeromelaban]

Thanks. For some reason, it seems that the build is still using .NET 3.1 instead. You may want to add ./dotnet6 to your PATH so it gets used first, or use source ./dotnet-install.sh. See this documentation on how to install .NET for your environment.

[davidconoh]

@jeromelaban Here's an update: Now working with .NET 7, WASM builds fine on Linux locally but throws an error when trying to host on Amplify:

With the root directory containing other target folders, this is the content of my amplify.yml file:

version: 1
frontend:
  phases:
    preBuild:
      commands:
        - cd UnoWasmAWS.Wasm
        - curl -sSL https://dot.net/v1/dotnet-install.sh > dotnet-install.sh
        - chmod +x *.sh
        - ./dotnet-install.sh -c 7.0 -InstallDir ./dotnet7
        - ./dotnet7/dotnet --version
    build:
      commands:
        - ./dotnet7/dotnet publish -c Release -o release
  artifacts:
    baseDirectory: /release/wwwroot
    files:
      - '**/*'
  cache:
    paths: []

[jeromelaban]

Thanks for the update. You'll notice that when building an unoapp with the dotnet publish command, there's no wwwroot folder in the output. The site's root is immediately in the release folder you sepecified as -o release.

[davidconoh]

Thanks a lot for the support. You can find a new description of how to host Uno Platform WASM applications on AWS Amplify here: https://reads.davidconoh.me/hosting-uno-platform-wasm-on-aws-amplify/
Let me know your thoughts as well :)

[jeromelaban]

This is very nice! Thanks for the writeup. If you wish you can add yourself in this page: https://github.com/unoplatform/uno/blob/master/doc/articles/guides/community-tutorials.md