Refactor initializing tracing-subscriber in examples (#1596)

* Refactor initializing tracing-subscriber

* Revert "Refactor initializing tracing-subscriber"

This reverts commit 0876260bf9 in favor of tracing_subscriber::registry.

* Use EnvFilter::try_from_default_env in chat example

* Use EnvFilter::try_from_default_env in examples

examples/chat/src/main.rs

@@ -33,9 +33,10 @@ struct AppState {
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_chat=trace".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_chat=trace".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/consume-body-in-extractor-or-middleware/src/main.rs

@@ -22,10 +22,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_consume_body_in_extractor_or_middleware=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/customize-extractor-error/src/main.rs

@@ -15,10 +15,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_customize_extractor_error=trace".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/customize-path-rejection/src/main.rs

@@ -19,10 +19,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_customize_path_rejection=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/error-handling-and-dependency-injection/src/main.rs

@@ -24,10 +24,10 @@ use uuid::Uuid;
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_error_handling_and_dependency_injection=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/form/src/main.rs

@@ -12,9 +12,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_form=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_form=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/global-404-handler/src/main.rs

@@ -16,9 +16,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_global_404_handler=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_global_404_handler=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/http-proxy/src/main.rs

@@ -28,10 +28,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_http_proxy=trace,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/jwt/src/main.rs

@@ -56,9 +56,10 @@ static KEYS: Lazy<Keys> = Lazy::new(|| {
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_jwt=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_jwt=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/key-value-store/src/main.rs

@@ -33,10 +33,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_key_value_store=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/low-level-rustls/src/main.rs

@@ -30,9 +30,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_tls_rustls=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_tls_rustls=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/multipart-form/src/main.rs

@@ -17,10 +17,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_multipart_form=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/oauth/src/main.rs

@@ -33,9 +33,10 @@ static COOKIE_NAME: &str = "SESSION";
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_oauth=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_oauth=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/parse-body-based-on-content-type/src/main.rs

@@ -21,11 +21,11 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| {
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| {
                 "example_parse_body_based_on_content_type=debug,tower_http=debug".into()
             }),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/print-request-response/src/main.rs

@@ -18,10 +18,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_print_request_response=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/prometheus-metrics/src/main.rs

@@ -66,10 +66,10 @@ async fn start_metrics_server() {
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_todos=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/rest-grpc-multiplex/src/main.rs

@@ -48,10 +48,10 @@ async fn web_root() -> &'static str {
 async fn main() {
     // initialize tracing
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_rest_grpc_multiplex=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/sessions/src/main.rs

@@ -30,9 +30,10 @@ const AXUM_SESSION_COOKIE_NAME: &str = "axum_session";
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_sessions=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_sessions=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/sqlx-postgres/src/main.rs

@@ -28,9 +28,10 @@ use std::{net::SocketAddr, time::Duration};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_tokio_postgres=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_tokio_postgres=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/sse/src/main.rs

@@ -20,10 +20,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_sse=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/static-file-server/src/main.rs

@@ -24,10 +24,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_static_file_server=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/stream-to-file/src/main.rs

@@ -23,9 +23,10 @@ const UPLOADS_DIRECTORY: &str = "uploads";
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_stream_to_file=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_stream_to_file=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/templates/src/main.rs

@@ -18,9 +18,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_templates=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_templates=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/testing/src/main.rs

@@ -14,10 +14,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_testing=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/tls-rustls/src/main.rs

@@ -25,9 +25,10 @@ struct Ports {
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_tls_rustls=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_tls_rustls=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/todos/src/main.rs

@@ -36,10 +36,10 @@ use uuid::Uuid;
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_todos=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/tokio-postgres/src/main.rs

@@ -20,9 +20,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_tokio_postgres=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_tokio_postgres=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/tracing-aka-logging/src/main.rs

@@ -19,10 +19,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_tracing_aka_logging=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/unix-domain-socket/src/main.rs

@@ -45,9 +45,10 @@ mod unix {
 
     pub async fn server() {
         tracing_subscriber::registry()
-            .with(tracing_subscriber::EnvFilter::new(
-                std::env::var("RUST_LOG").unwrap_or_else(|_| "debug".into()),
-            ))
+            .with(
+                tracing_subscriber::EnvFilter::try_from_default_env()
+                    .unwrap_or_else(|_| "debug".into()),
+            )
             .with(tracing_subscriber::fmt::layer())
             .init();
 

examples/validator/src/main.rs

@@ -27,9 +27,10 @@ use validator::Validate;
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_validator=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_validator=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/versioning/src/main.rs

@@ -18,9 +18,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_versioning=debug".into()),
-        ))
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_versioning=debug".into()),
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();
 

examples/websockets/src/main.rs

@@ -26,10 +26,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_websockets=debug,tower_http=debug".into()),
-        ))
+        )
         .with(tracing_subscriber::fmt::layer())
         .init();