[ComplianceTests] Malformed compliance tests

[yisraelU]

This pr adds the last component of the protocol compliance tests as defined by Smithy
https://smithy.io/2.0/additional-specs/http-protocol-compliance-tests.html#httpmalformedrequesttests

[yisraelU]

[error] [http4sJS3] Referring to non-existent class software.amazon.smithy.utils.SimpleCodeWriter
@Baccata I dont know too much about scalajs , is this because of the nio utils included in this package
https://github.com/awslabs/smithy/blob/main/smithy-utils/src/main/java/software/amazon/smithy/utils/IoUtils.java

[kubukoz]

way to dig up an old issue, I know...

the problem is that you're using a Java class: import software.amazon.smithy.utils.SimpleCodeWriter - can't do this in a cross-compiled Scala module. We're gonna have to rewrite the implementation in terms of something written 100% in Scala.

[yisraelU]

@kubukoz can you explain more.
Why would using a java class prevent cross compilation ? All Scala code calls java code.
Do you mean because it is being called directly rather through a layer of indirection. ?

[kubukoz]

All Scala code calls java code.

Sort of. The Scala standard library does call out to some Java classes/methods, but because Java code can't be transpiled to JS/Native, these classes/methods have to be reimplemented in Scala - you can find that e.g.

• String in Scala Native's javalib
• String in Scala.js' s javalib

Why would using a java class prevent cross compilation?

just because Scala.js and Scala Native's compiler plugins can only output the appropriate SJSIR / NIR files from Scala files. These *IR files are needed for further processing, e.g. linking and generating output JS/LLVM.

to sum up, you can't use any Java symbol on JS/Native, unless a Scala implementation is also provided.

This is why we have platform-specific files in the first place - sometimes you can't / don't want to reimplement the Java, so:

• in Java-specific sources you'll use Java libraries,
• in JS-specific sources you'll use interop with JavaScript libraries,
• in Native-specific sources you'll use interop with native libraries.

[kubukoz]

There was a project that provided a Java frontend for Scala.js, which would allow using Java code on the JS side here, but it seems to have been forgotten: https://github.com/arthanzel/scalajs-jfe

[yisraelU]

closed in favor of #1918