Provide native lib for libsignal with GraalVM

[RichardFevrier]

Hi everyone 👋 thank you for your amazing work!

I'm facing an issue when I try to include signal-client-java-0.2.3.jar & zkgroup-java-0.7.0.jar modified using compiled versions of libsignal-client-java-0.2.3 & zkgroup-0.7.2 AND GraalVM native image for aarch64 (Raspberry Pi 4 thru a docker image).

If I use the "usual" way without GraalVM everything works like a charm!.. except that starting a JVM every time we need to send a message is a no-go to me in terms of performance.

So I decided to try to include GraalVM in the process of building this library;
It works! But not for the modified versions of signal-client-java-0.2.3.jar & zkgroup-java-0.7.0.jar.

Here is what I've done so far (sorry if it doesn't make sense, I absolutely don't know how Gradle, GraalVM.. works):

• Fetching & compiling (sources) libsignal-client-java-0.2.3 & zkgroup-0.7.2
• Fetching (sources) signal-cli-0.8.1
• Compiling signal-cli-0.8.1 with gradle build && gradle installDist BUT not gradle distTar... which doesn't seem related to GraalVM
• Patching (zip) signal-client-java-0.2.3.jar & zkgroup-java-0.7.0.jar with the results of libsignal-client-java-0.2.3 & zkgroup-0.7.2 compilations
• Finally compiling signal-cli-0.8.1 with gradle assembleNativeImage

Unfortunately gradle assembleNativeImage doesn't seem to use the result of gradle build && gradle installDist to perform his tasks..

I hope @AsamK or/and @michaelkebe could take a look into this issue.

I'm ready to perform tests if you need me to.

Thanks a lot for your time.
Best regards.

[RichardFevrier]

Some news here, I read more about GraalVM and I was able to get it working.

Writing here if it can help someone else:

• Fetching & compiling (sources) libsignal-client-java-0.2.3 & zkgroup-0.7.2
• Fetching (sources) signal-cli-0.8.1
• Copying the results of libsignal-client-java-0.2.3 & zkgroup-0.7.2 compilations (libsignal_jni.so & libzkgroup.so) into signal-cli-0.8.1/lib/src/main/resources
• Finally compiling signal-cli-0.8.1 with gradle assembleNativeImage

One thing not working tho is the support for new group v2 because apparently libzkgroup is missing..
I will try to investigate further.

Anyway, performance is great now!
Maybe it would be a good idea to add a little bit more documentation.

Thanks a lot for your time.
Best regards.

[mericon]

I Compiled as you described and Got an native build but IT says that lib misssing required native library dependency: libsignal-client. How can i fix that?

Got IT Workin with v0.8.1

[RichardFevrier]

@mericon do you have the support for new group v2 missing too ?