Add better default logging configurations for development

Cargo.lock

@@ -638,6 +638,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "matchers"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+dependencies = [
+ "regex-automata",
+]
+
 [[package]]
 name = "matchit"
 version = "0.7.0"
@@ -816,6 +825,30 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "regex"
+version = "1.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b1f693b24f6ac912f4893ef08244d70b6067480d2f1a46e950c9691e6749d1d"
+dependencies = [
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+dependencies = [
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
 [[package]]
 name = "reqwest"
 version = "0.11.17"
@@ -1327,10 +1360,14 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "30a651bc37f915e81f087d86e62a18eec5f79550c7faff886f7090b4ea757c77"
 dependencies = [
+ "matchers",
  "nu-ansi-term",
+ "once_cell",
+ "regex",
  "sharded-slab",
  "smallvec",
  "thread_local",
+ "tracing",
  "tracing-core",
  "tracing-log",
 ]

nix-actions-cache/Cargo.toml

@@ -11,7 +11,7 @@ gha-cache = { path = "../gha-cache" }
 axum = "0.6.18"
 clap = { version = "4.2.7", features = ["derive"] }
 tracing = "0.1.37"
-tracing-subscriber = "0.3.17"
+tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
 tower-http = { version = "0.4.0", features = ["trace"] }
 serde_json = "1.0.96"
 thiserror = "1.0.40"

nix-actions-cache/src/main.rs

@@ -30,6 +30,7 @@ use clap::Parser;
 use tokio::fs;
 use tokio_stream::StreamExt;
 use tokio_util::io::StreamReader;
+use tracing_subscriber::EnvFilter;
 
 use error::{Error, Result};
 use gha_cache::{Api, Credentials};
@@ -78,7 +79,7 @@ struct StateInner {
 async fn main() {
     let args = Args::parse();
 
-    tracing_subscriber::fmt::init();
+    init_logging();
 
     let credentials = if let Some(credentials_file) = &args.credentials_file {
         tracing::info!("Loading credentials from {:?}", credentials_file);
@@ -128,6 +129,17 @@ async fn main() {
         .unwrap();
 }
 
+fn init_logging() {
+    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| {
+        #[cfg(debug_assertions)]
+        return EnvFilter::new("gha_cache=debug,nix_action_cache=debug");
+
+        #[cfg(not(debug_assertions))]
+        return EnvFilter::default();
+    });
+    tracing_subscriber::fmt().with_env_filter(filter).init();
+}
+
 #[cfg(debug_assertions)]
 async fn dump_api_stats<B>(
     Extension(state): Extension<State>,