refactor: use logger (#22)

src/main.rs

@@ -2,8 +2,14 @@ mod args;
 mod auth;
 mod server;
 
+#[macro_use]
+extern crate log;
+
 pub type BoxResult<T> = Result<T, Box<dyn std::error::Error>>;
 
+use std::env;
+use std::io::Write;
+
 use crate::args::{encode_uri, matches, Args};
 use crate::server::serve;
 
@@ -13,6 +19,16 @@ async fn main() {
 }
 
 async fn run() -> BoxResult<()> {
+    if env::var("RUST_LOG").is_err() {
+        env::set_var("RUST_LOG", "info")
+    }
+    env_logger::builder()
+        .format(|buf, record| {
+            let timestamp = buf.timestamp();
+            writeln!(buf, "[{} {}] {}", timestamp, record.level(), record.args())
+        })
+        .init();
+
     let args = Args::parse(matches())?;
     tokio::select! {
         ret = serve(args) => {