Switch Debug middleware from println! to debug!

All this output is annoying during local development, and can be easily
accessed if necessary via the `RUST_LOG` environment variable.

Author: jtgeibel

src/middleware.rs

@@ -46,7 +46,8 @@ pub fn build_middleware(app: Arc<App>, endpoints: RouteBuilder) -> MiddlewareBui
     }
 
     if env == Env::Development {
-        // Print a log for each request.
+        // Optionally print debug information for each request
+        // To enable, set the environment variable: `RUST_LOG=cargo_registry::middleware=debug`
         m.add(Debug);
     }
 

src/middleware/debug.rs

@@ -12,9 +12,9 @@ impl Middleware for Debug {
 
     fn after(&self, _req: &mut dyn RequestExt, res: AfterResult) -> AfterResult {
         res.map(|res| {
-            println!("  <- {:?}", res.status());
+            debug!("  <- {:?}", res.status());
             for (k, v) in res.headers().iter() {
-                println!("  <- {} {:?}", k, v);
+                debug!("  <- {} {:?}", k, v);
             }
             res
         })
@@ -26,15 +26,15 @@ struct DebugRequest;
 
 impl Middleware for DebugRequest {
     fn before(&self, req: &mut dyn RequestExt) -> BeforeResult {
-        println!("  version: {:?}", req.http_version());
-        println!("  method: {:?}", req.method());
-        println!("  scheme: {:?}", req.scheme());
-        println!("  host: {:?}", req.host());
-        println!("  path: {}", req.path());
-        println!("  query_string: {:?}", req.query_string());
-        println!("  remote_addr: {:?}", req.remote_addr());
+        debug!("  version: {:?}", req.http_version());
+        debug!("  method: {:?}", req.method());
+        debug!("  scheme: {:?}", req.scheme());
+        debug!("  host: {:?}", req.host());
+        debug!("  path: {}", req.path());
+        debug!("  query_string: {:?}", req.query_string());
+        debug!("  remote_addr: {:?}", req.remote_addr());
         for (k, ref v) in req.headers().iter() {
-            println!("  hdr: {}={:?}", k, v);
+            debug!("  hdr: {}={:?}", k, v);
         }
         Ok(())
     }