feat(log) add logging system

backend/.env

@@ -1,6 +1,11 @@
-BLOG_ENDPOINT=git@github.com:Lumither/blog-posts.git
+# General
 GIT_WORK_DIR=/home/lumither/dev/blog/blog_posts_git
+BLOG_ENDPOINT=git@github.com:Lumither/blog-posts.git
+LOG_ROOT_DIR=/var/log/nocturne
 
+# Backend
 BACKEND_URL=https://lumither.com/api
 BACKEND_PORT=3001
+
+## Database related
 DB_CONNECTION=postgresql://localhost:5432/blog

backend/Cargo.toml

@@ -16,3 +16,7 @@ sqlx = { version = "0.7.4", features = ["runtime-tokio", "tls-native-tls", "post
 chrono = { version = "0.4.38", features = ["serde", "alloc"] }
 regex = "1.10.4"
 futures = { version = "0.3.30", features = ["executor"] }
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"
+tracing-appender = "0.2.3"
+log = "0.4.21"

backend/src/logger.rs

@@ -0,0 +1,72 @@
+use std::{env, io};
+
+use chrono::Local;
+use tracing::{error, info, Level};
+use tracing_appender::{non_blocking, rolling};
+use tracing_appender::non_blocking::WorkerGuard;
+use tracing_subscriber::{fmt, Registry};
+use tracing_subscriber::fmt::format::Writer;
+use tracing_subscriber::fmt::MakeWriter;
+use tracing_subscriber::fmt::time::FormatTime;
+use tracing_subscriber::fmt::writer::MakeWriterExt;
+use tracing_subscriber::layer::SubscriberExt;
+
+use crate::constants::GLOBAL_TIME_FORMAT;
+
+struct LocalTimer;
+
+impl FormatTime for LocalTimer {
+    fn format_time(&self, w: &mut Writer<'_>) -> std::fmt::Result {
+        write!(w, "{}", Local::now().format(GLOBAL_TIME_FORMAT))
+    }
+}
+
+type LogWriter = dyn for<'writer> MakeWriter<'writer, Writer = dyn io::Write + 'static> + 'static;
+
+pub fn init() -> (WorkerGuard, WorkerGuard) {
+    let log_path = env::var("LOG_ROOT_DIR").unwrap_or_else(|e| {
+        panic!("[Fatal] failed to load LOG_ROOT_DIR: {}", e);
+    });
+
+    let log_path = format!("{}/backend", log_path);
+
+    let (info_log_writer, info_guard) = non_blocking(rolling::never(&log_path, "info.log"));
+    // let info_log = info_log.with_max_level(Level::TRACE);
+
+    let (err_log_writer, error_guard) = non_blocking(rolling::never(&log_path, "error.log"));
+    // let error_log = error_logging_handle.with_filter(|log| log.level().eq(&Level::ERROR));
+
+    let log_format = tracing_subscriber::fmt::format()
+        .with_level(true)
+        .with_target(true)
+        .with_source_location(true)
+        .with_timer(LocalTimer);
+
+    // todo: separate errors/warnings/info logs
+    let subscribers = Registry::default()
+        .with(
+            fmt::Layer::default()
+                .with_writer(info_log_writer)
+                // .with_max_level(Level::TRACE)
+                .with_ansi(false),
+        )
+        .with(
+            fmt::Layer::default()
+                .with_writer(err_log_writer)
+                .with_ansi(false),
+        )
+        .with(
+            fmt::Layer::default()
+                .with_writer(io::stdout)
+                .with_ansi(true)
+                .event_format(log_format),
+        );
+
+    tracing::subscriber::set_global_default(subscribers)
+        .expect("[Fatal] Failed to setup logging system");
+
+    info!("Module Started: Logger");
+
+    // error!("test");
+    (info_guard, error_guard)
+}

backend/src/main.rs

@@ -1,10 +1,15 @@
 use std::env;
 use std::error::Error;
+use std::num::ParseIntError;
+use std::process::exit;
+use std::str::FromStr;
 
 use axum::Router;
 use axum::routing::{get, post};
 use dotenv::dotenv;
-use sqlx::postgres::PgPoolOptions;
+use sqlx::ConnectOptions;
+use sqlx::postgres::{PgConnectOptions, PgPoolOptions};
+use tracing::{error, warn};
 
 use crate::api::get::get_post::get_post;
 use crate::api::get::get_post_list::get_post_list;
@@ -12,24 +17,49 @@ use crate::api::post::refresh::refresh;
 
 mod api;
 mod constants;
+mod logger;
 mod markdown;
 mod model;
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
-    dotenv()?;
+    match dotenv() {
+        Ok(_) => {
+            println!("[Info] env loaded, starting up...")
+        }
+        Err(e) => {
+            panic!("[Fatal] failed to load env var: {}", e)
+        }
+    };
+
+    let _guards = logger::init();
 
     let port: u32 = match env::var("BACKEND_PORT") {
-        Ok(value) => value.parse().unwrap(),
+        Ok(value) => value.parse().unwrap_or_else(|e: ParseIntError| {
+            warn!("Failed to parse BACKEND_PORT: {}", e.to_string());
+            3001
+        }),
         Err(_) => 3001,
     };
 
-    let db_connection: String = env::var("DB_CONNECTION")?;
+    let db_uri: String = env::var("DB_CONNECTION").unwrap_or_else(|e| {
+        error!(
+            "Invalid or missing env var: DB_CONNECTION: {}",
+            e.to_string()
+        );
+        exit(1);
+    });
+    let db_connect_option = PgConnectOptions::from_str(&db_uri)
+        .unwrap()
+        .disable_statement_logging();
 
     let db_pool = PgPoolOptions::new()
-        .connect(&db_connection)
+        .connect_with(db_connect_option)
         .await
-        .expect("failed to load database");
+        .unwrap_or_else(|e| {
+            error!("Failed to load database: {}", e.to_string());
+            exit(1);
+        });
 
     let app = Router::new()
         .route("/refresh_posts", post(refresh))
@@ -37,9 +67,17 @@ async fn main() -> Result<(), Box<dyn Error>> {
         .route("/get_post/:post_id", get(get_post))
         .with_state(db_pool);
 
-    let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", port)).await?;
+    let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", port))
+        .await
+        .unwrap_or_else(|e| {
+            error!("Failed to build TCP listener: {}", e.to_string());
+            exit(1);
+        });
 
-    axum::serve(listener, app).await?;
+    axum::serve(listener, app).await.unwrap_or_else(|e| {
+        error!("Failed to start axum: {}", e.to_string());
+        exit(1);
+    });
 
     Ok(())
 }