MITM Logging?

[kenberland]

Is there an easy way to cause lsp4j to log the entire client-server conversation to a file? Perhaps an environment variable or addition to logging.properties?

[jonahgraham]

Not that I know of. There is TracingMessageConsumer that logs in such a format that the now discontinued Language Server Protocol Inspector understood. But that requires the LSP4J to be launched in the correct way (using Launcher.traceMessages) which is normally handled by the next layer up.

[kenberland]

I seem to be getting something with this hack.

[nixel2007]

We use PrintWriter for that:

https://github.com/1c-syntax/bsl-language-server/blob/develop/src/main/java/com/github/_1c_syntax/bsl/languageserver/cli/lsp/LanguageServerLauncherConfiguration.java

We use extended configurable version of PrintWriter: https://github.com/1c-syntax/bsl-language-server/blob/develop/src/main/java/com/github/_1c_syntax/bsl/languageserver/cli/lsp/FileAwarePrintWriter.java

But you can pass the generic one.