add tracing for logging

Cargo.lock

@@ -1135,6 +1135,12 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4345964bb142484797b161f473a503a434de77149dd8c7427788c6e13379388"
 
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.155"
@@ -1200,6 +1206,15 @@ dependencies = [
  "tendril",
 ]
 
+[[package]]
+name = "matchers"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+dependencies = [
+ "regex-automata 0.1.10",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
@@ -1225,6 +1240,8 @@ dependencies = [
  "serde_json",
  "strum",
  "tokio",
+ "tracing",
+ "tracing-subscriber",
 ]
 
 [[package]]
@@ -1289,6 +1306,16 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "38bf9645c8b145698bb0b18a4637dcacbc421ea49bef2317e4fd8065a387cf21"
 
+[[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-conv"
 version = "0.1.0"
@@ -1373,6 +1400,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "overload"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
+
 [[package]]
 name = "parking_lot"
 version = "0.12.3"
@@ -1639,8 +1672,17 @@ checksum = "b91213439dad192326a0d7c6ee3955910425f441d7038e0d6933b0aec5c4517f"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata",
+ "regex-automata 0.4.7",
- "regex-syntax",
+ "regex-syntax 0.8.4",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+dependencies = [
+ "regex-syntax 0.6.29",
 ]
 
 [[package]]
@@ -1651,7 +1693,7 @@ checksum = "38caf58cc5ef2fed281f89292ef23f6365465ed9a41b7a7754eb4e26496c92df"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax",
+ "regex-syntax 0.8.4",
 ]
 
 [[package]]
@@ -1660,6 +1702,12 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53a49587ad06b26609c52e423de037e7f57f20d53535d66e08c695f347df952a"
 
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
 [[package]]
 name = "regex-syntax"
 version = "0.8.4"
@@ -1946,6 +1994,15 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "sharded-slab"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f40ca3c46823713e0d4209592e8d6e826aa57e928f09752619fc696c499637f6"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.4.2"
@@ -2133,6 +2190,16 @@ dependencies = [
  "utf-8",
 ]
 
+[[package]]
+name = "thread_local"
+version = "1.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b9ef9bad013ada3808854ceac7b46812a6465ba368859a37e2100283d2d719c"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+]
+
 [[package]]
 name = "time"
 version = "0.3.36"
@@ -2278,9 +2345,21 @@ checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
  "log",
  "pin-project-lite",
+ "tracing-attributes",
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-attributes"
+version = "0.1.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.68",
+]
+
 [[package]]
 name = "tracing-core"
 version = "0.1.32"
@@ -2288,6 +2367,36 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
 dependencies = [
  "once_cell",
+ "valuable",
+]
+
+[[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-subscriber"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
+dependencies = [
+ "matchers",
+ "nu-ansi-term",
+ "once_cell",
+ "regex",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing",
+ "tracing-core",
+ "tracing-log",
 ]
 
 [[package]]
@@ -2358,6 +2467,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
+[[package]]
+name = "valuable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"

Cargo.toml

@@ -20,3 +20,5 @@ serde = { version = "1.0.203", features = ["derive"] }
 serde_json = "1.0.120"
 strum = { version = "0.26.3", features = ["derive"] }
 tokio = { version = "1.38.0", features = ["full"] }
+tracing = "0.1.40"
+tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }

src/cache.rs

@@ -4,6 +4,7 @@ use chrono::{NaiveDate, Utc};
 use futures::StreamExt;
 use itertools::Itertools;
 use tokio::sync::RwLock;
+use tracing::{debug, instrument};
 
 use crate::{Canteen, Menu};
 
@@ -21,6 +22,7 @@ impl MenuCache {
             .await
     }
 
+    #[instrument(skip(self))]
     pub async fn get(&self, canteen: Canteen, date: NaiveDate) -> Option<Menu> {
         let query = (date, canteen);
         let (is_in_cache, is_cache_too_large) = {
@@ -34,6 +36,8 @@ impl MenuCache {
             let cache = self.cache.read().await;
             Some(cache.get(&query)?.clone())
         } else {
+            debug!("Not in cache, fetching from network");
+
             let menu = Menu::new(date, canteen).await.ok()?;
 
             self.cache.write().await.insert(query, menu.clone());

src/main.rs

@@ -9,12 +9,21 @@ use mensa_upb_api::{Canteen, MenuCache};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 use strum::IntoEnumIterator;
+use tracing::{debug, error, info, level_filters::LevelFilter};
+use tracing_subscriber::EnvFilter;
 
-#[actix_web::main]
+#[tokio::main]
 async fn main() -> io::Result<()> {
+    let env_filter = EnvFilter::builder()
+        .with_default_directive(LevelFilter::WARN.into())
+        .from_env()
+        .expect("Invalid filter")
+        .add_directive("mensa_upb_api=debug".parse().unwrap());
+    tracing_subscriber::fmt().with_env_filter(env_filter).init();
+
     match dotenvy::dotenv() {
-        Ok(_) => println!("Loaded .env file"),
+        Ok(_) => debug!("Loaded .env file"),
-        Err(dotenvy::Error::LineParse(..)) => eprintln!("Malformed .env file"),
+        Err(dotenvy::Error::LineParse(..)) => error!("Malformed .env file"),
         Err(_) => {}
     }
 
@@ -49,7 +58,7 @@ async fn main() -> io::Result<()> {
 
     let menu_cache = MenuCache::default();
 
-    println!("Starting server on {}:{}", interface, port);
+    info!("Starting server on {}:{}", interface, port);
 
     HttpServer::new(move || {
         let cors = allowed_cors