Adds logging example to errors chapter.

examples/errors/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "errors"
+name = "my_errors"
 version = "1.0.0"
 edition = "2018"
 

examples/errors/src/logging.rs

@@ -0,0 +1,38 @@
+// <logging>
+use actix_web::{error, Result};
+use failure::Fail;
+use log::debug;
+
+#[derive(Fail, Debug)]
+#[fail(display = "my error")]
+pub struct MyError {
+    name: &'static str,
+}
+
+// Use default implementation for `error_response()` method
+impl error::ResponseError for MyError {}
+
+pub fn index() -> Result<&'static str, MyError> {
+    let err = MyError { name: "test error" };
+    debug!("{}", err);
+    Err(err)
+}
+
+pub fn main() {
+    use actix_web::{middleware::Logger, web, App, HttpServer};
+
+    std::env::set_var("RUST_LOG", "my_errors=debug,actix_web=info");
+    std::env::set_var("RUST_BACKTRACE", "1");
+    env_logger::init();
+
+    HttpServer::new(|| {
+        App::new()
+            .wrap(Logger::default())
+            .route("/", web::get().to(index))
+    })
+    .bind("127.0.0.1:8088")
+    .unwrap()
+    .run()
+    .unwrap();
+}
+// </logging>

examples/errors/src/main.rs

@@ -1,4 +1,5 @@
 pub mod helpers;
+pub mod logging;
 pub mod override_error;
 pub mod recommend_one;
 pub mod recommend_two;