Log raw json-rpc messages

[chioni16]

Hello! Is it possible to log the raw json-rpc of messages both received from the client and that are sent back to client?
Thanks!

[ebkalderon]

Hey there! tower-lsp includes built-in integration with tracing for logging. The raw JSON-RPC payloads of both incoming (client-to-server) and outgoing (server-to-client) messages are recorded as trace!() logs here:

tower-lsp/src/codec.rs

Line 141 in 7b58012

trace!("-> {}", msg);

and here:

tower-lsp/src/codec.rs

Line 181 in 7b58012

trace!("<- {}", message);

respectively.

Depending on which tracing subscriber you have set up, you should be able to filter by the "trace" log level emitted from tower_lsp::codec to view the raw messages. For instance, the example programs included in the examples/ directory are set up using the fmt subscriber. To view the raw JSON-RPC message traffic, launch an example with RUST_LOG=error,tower_lsp::codec=trace and those log messages should be printed to stderr.

Hope this is helpful!

[chioni16]

Thanks!

[ebkalderon]

No problem! Happy to help. 😄