configure log level with RUST_LOG environment variable (#75)

Author: bnusunny

Cargo.lock

@@ -25,7 +25,7 @@ reqwest = { version = "0.11", default-features = false, features = ["json"] }
 tokio = { version = "1.20.0", features = ["macros", "io-util", "sync", "rt-multi-thread", "time"] }
 tokio-retry = "0.3"
 tracing = { version = "0.1", features = ["log"] }
-tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt"] }
+tracing-subscriber = { version = "0.3", default-features = false, features = ["env-filter", "fmt"] }
 tower = "0.4.13"
 
 [[bin]]

Cargo.toml

@@ -4,14 +4,14 @@
 type Error = Box<dyn std::error::Error + Send + Sync + 'static>;
 
 use lambda_web_adapter::{Adapter, AdapterOptions};
+use tracing_subscriber::filter::{EnvFilter, LevelFilter};
 
 #[tokio::main]
 async fn main() -> Result<(), Error> {
-    tracing_subscriber::fmt()
-        .with_max_level(tracing::Level::INFO)
-        .with_target(false)
-        .without_time()
-        .init();
+    let filter = EnvFilter::builder()
+        .with_default_directive(LevelFilter::INFO.into())
+        .from_env_lossy();
+    tracing_subscriber::fmt().with_env_filter(filter).without_time().init();
 
     let options = AdapterOptions::from_env();
     lambda_web_adapter::register_default_extension();