Complete Chapter 4

+ Add in Tracing Logging
+ Logs are JSON formatted with events
+ Tests are confirmed working

tests/health_check.rs

@@ -1,15 +1,32 @@
 use mail_app::configuration::{get_configuration, DatabaseSettings};
 use mail_app::startup::run;
+use mail_app::telemetry::{get_subscriber, init_subscriber};
+use once_cell::sync::Lazy;
+use secrecy::ExposeSecret;
 use sqlx::{Executor, PgPool};
 use std::net::TcpListener;
 use uuid::Uuid;
 
+static TRACING: Lazy<()> = Lazy::new(|| {
+    let default_filter_level = "info".to_string();
+    let subscriber_name = "test".to_string();
+    if std::env::var("TEST_LOG").is_ok() {
+        let subscriber = get_subscriber(subscriber_name, default_filter_level, std::io::stdout);
+        init_subscriber(subscriber);
+    } else {
+        let subscriber = get_subscriber(subscriber_name, default_filter_level, std::io::sink);
+        init_subscriber(subscriber);
+    };
+});
+
 pub struct TestApp {
     pub address: String,
     pub db_pool: PgPool,
 }
 
 async fn spawn_app() -> TestApp {
+    Lazy::force(&TRACING);
+
     let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind to random port.");
     let port = listener.local_addr().unwrap().port();
     let address = format!("http://127.0.0.1:{}", port);
@@ -30,7 +47,7 @@ async fn spawn_app() -> TestApp {
 
 pub async fn configure_database(config: &DatabaseSettings) -> PgPool {
     // Create Database
-    let connection = PgPool::connect(&config.connection_string_without_db())
+    let connection = PgPool::connect(&config.connection_string_without_db().expose_secret())
         .await
         .expect("Failed to connect to Postgres.");
     connection
@@ -39,7 +56,7 @@ pub async fn configure_database(config: &DatabaseSettings) -> PgPool {
         .expect("Failed to create database.");
 
     // Migrate Database
-    let connection_pool = PgPool::connect(&config.connection_string())
+    let connection_pool = PgPool::connect(&config.connection_string().expose_secret())
         .await
         .expect("Failed to connect to Postgres.");
     sqlx::migrate!("./migrations")