logging

Cargo.lock

@@ -194,6 +194,8 @@ dependencies = [
  "reqwest",
  "serde",
  "tokio",
+ "tracing",
+ "tracing-subscriber",
 ]
 
 [[package]]
@@ -990,6 +992,16 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "nu-ansi-term"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77a8165726e8236064dbb45459242600304b42a5ea24ee2948e18e023bf7ba84"
+dependencies = [
+ "overload",
+ "winapi",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1064,6 +1076,12 @@ version = "6.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2355d85b9a3786f481747ced0e0ff2ba35213a1f9bd406ed906554d7af805a1"
 
+[[package]]
+name = "overload"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
+
 [[package]]
 name = "owo-colors"
 version = "4.2.1"
@@ -1721,9 +1739,21 @@ checksum = "784e0ac535deb450455cbfa28a6f0df145ea1bb7ae51b821cf5e7927fdcfbdd0"
 dependencies = [
  "log",
  "pin-project-lite",
+ "tracing-attributes",
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-attributes"
+version = "0.1.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b1ffbcf9c6f6b99d386e7444eb608ba646ae452a36b39737deb9663b610f662"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tracing-core"
 version = "0.1.33"
@@ -1744,15 +1774,42 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "tracing-log"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
+dependencies = [
+ "log",
+ "once_cell",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-serde"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "704b1aeb7be0d0a84fc9828cae51dab5970fee5088f83d1dd7ee6f6246fc6ff1"
+dependencies = [
+ "serde",
+ "tracing-core",
+]
+
 [[package]]
 name = "tracing-subscriber"
 version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e8189decb5ac0fa7bc8b96b7cb9b2701d60d48805aca84a238004d665fcc4008"
 dependencies = [
+ "nu-ansi-term",
+ "serde",
+ "serde_json",
  "sharded-slab",
+ "smallvec",
  "thread_local",
  "tracing-core",
+ "tracing-log",
+ "tracing-serde",
 ]
 
 [[package]]

Cargo.toml

@@ -12,3 +12,5 @@ pretty-hex = "0.3"
 reqwest = { version = "0.11", features = ["json"] }
 serde = { version = "1", features = ["derive"] }
 tokio = { version = "1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["json"] }

src/main.rs

@@ -9,12 +9,25 @@ use axum::{
 };
 use reqwest::StatusCode;
 use serde::Deserialize;
+use std::str::FromStr;
+use tracing::{info, Level};
+use tracing_subscriber::{filter::Targets, layer::SubscriberExt, util::SubscriberInitExt};
 
 #[tokio::main]
 async fn main() {
+    let filter = Targets::from_str(std::env::var("RUST_LOG").as_deref().unwrap_or("info"))
+        .expect("RUST_LOG should be a valid tracing filter");
+    tracing_subscriber::fmt()
+        .with_max_level(Level::TRACE)
+        .json()
+        .finish()
+        .with(filter)
+        .init();
     let app = Router::new().route("/", get(root_get));
 
-    axum::Server::bind(&"0.0.0.0:5000".parse().unwrap())
+    let addr = "0.0.0.0:5000".parse().unwrap();
+    info!("listening on {}", addr);
+    axum::Server::bind(&addr)
         .serve(app.into_make_service())
         .await
         .unwrap();