feat(crypto-nodejs): Enable traace filtering and change the env var to MATRIX_LOG.

Author: Hywan

crates/matrix-sdk-crypto-nodejs/Cargo.toml

@@ -33,7 +33,7 @@ napi = { git = "https://github.com/Hywan/napi-rs", branch = "feat-either-n-up-to
 napi-derive = { git = "https://github.com/Hywan/napi-rs", branch = "feat-either-n-up-to-26" }
 serde_json = "1.0.79"
 http = "0.2.6"
-tracing-subscriber = { version = "0.3", default-features = false, features = ["tracing-log", "time", "smallvec", "fmt"], optional = true }
+tracing-subscriber = { version = "0.3", default-features = false, features = ["tracing-log", "time", "smallvec", "fmt", "env-filter"], optional = true }
 
 [build-dependencies]
-napi-build = "2.0.0"
+napi-build = "2.0.0"

crates/matrix-sdk-crypto-nodejs/README.md

@@ -100,15 +100,15 @@ turned on:
 $ npm run build -- --features tracing
 ```
 
-Now, you can use the `RUST_LOG` environment variable to tweak the log filtering, such as:
+Now, you can use the `MATRIX_LOG` environment variable to tweak the log filtering, such as:
 
 ```sh
-$ RUST_LOG=debug npm run test
+$ MATRIX_LOG=debug npm run test
 ```
 
 See
 [`tracing-subscriber`](https://tracing.rs/tracing_subscriber/index.html)
-to learn more about the `RUST_LOG` environment variable.
+to learn more about the `RUST_LOG`/`MATRIX_LOG` environment variable.
 
 ## Documentation
 

crates/matrix-sdk-crypto-nodejs/src/tracing.rs

@@ -1,7 +1,11 @@
 use napi_derive::*;
+use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 
 /// Subscribe to tracing events, i.e. turn on logs.
 #[napi]
 pub fn init_tracing() {
-    tracing_subscriber::fmt::init();
+    tracing_subscriber::registry()
+        .with(fmt::layer())
+        .with(EnvFilter::from_env("MATRIX_LOG"))
+        .init();
 }