Big changes, up to 3.8.5.5

.env

@@ -0,0 +1 @@
+DATABASE_URL="postgres://postgres:password@localhost:5432/newsletter"

.gitignore

@@ -1,6 +1,6 @@
 /target
 .vscode
-.env
+#.env
 .gitlab-ci-local
 
 # Added by cargo

Cargo.toml

@@ -13,6 +13,20 @@ name = "mail_app"
 [dependencies]
 actix-web = "4"
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
+serde = { version = "1", features = ["derive"] }
+config = "0.13"
+
+[dependencies.sqlx]
+version = "0.6"
+default-features = false
+features = [
+    "runtime-tokio-rustls",
+    "macros",
+    "postgres",
+    "uuid",
+    "chrono",
+    "migrate"
+]
 
 [dev-dependencies]
 reqwest = "0.11"

configuration.yaml

@@ -0,0 +1,7 @@
+application_port: 8000
+database:
+  host: "127.0.0.1"
+  port: 5432
+  username: "postgres"
+  password: "password"
+  database_name: "newsletter"

migrations/20230831130447_create_subscription_table.sql

@@ -0,0 +1,9 @@
+-- migrations/{timestamp}_create_subscriptions_table.sql
+-- Create Subscriptions Table
+CREATE TABLE subscriptions(
+    id uuid NOT NULL,
+    PRIMARY KEY (id),
+    email TEXT NOT NULL UNIQUE,
+    name TEXT NOT NULL,
+    subscribed_at timestamptz NOT NULL
+);

scripts/init_db.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -x
+set -eo pipefail
+
+if ! [ -x "$(command -v psql)" ]; then
+    echo >&2 "Error: psql is not installed."
+    exit 1
+fi
+
+if ! [ -x "$(command -v sqlx)" ]; then
+    echo >&2 "Error: sqlx is not installed."
+    echo >&2 "Use:"
+    echo >&2 "  cargo install --version="~0.6" sqlx-cli"
+    echo >&2 "  --no-default-features --feature rustls,postgres"
+    echo >&2 "to install."
+    exit 1
+fi
+
+DB_USER="${POSTGRES_USER:=postgres}"
+DB_PASSWORD="${POSTGRES_PASSWORD:=password}"
+DB_NAME="${POSTGRES_DB:=newsletter}"
+DB_PORT="${POSTGRES_PORT:=5432}"
+DB_HOST="${POSTGRES_HOST:=localhost}"
+
+if [[ -z "${SKIP_DOCKER}" ]]
+then
+    docker run \
+        -e POSTGRES_USER=${DB_USER} \
+        -e POSTGRES_PASSWORD=${DB_PASSWORD} \
+        -e POSTGRES_DB=${DB_NAME} \
+        -p "${DB_PORT}":5432 \
+        --name "mailAppDB" \
+        -d postgres:alpine \
+        postgres -N 1000
+fi
+
+# Ping until ready to accept commands
+export PGPASSWORD="${DB_PASSWORD}"
+until psql -h "${DB_HOST}" -U "${DB_USER}" -p "${DB_PORT}" -d "postgres" -c '\q'; do
+    >&2 echo "Postgres is still unavailable - sleeping"
+    sleep 1
+done
+
+>&2 echo "Postgres is running on port ${DB_PORT}, and ready to accept commands!"
+
+DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}
+export DATABASE_URL
+sqlx database create
+sqlx migrate run
+
+>&2 echo "Postgres has been migrated, ready for queries!"

src/configuration.rs

@@ -0,0 +1,34 @@
+
+#[derive(serde::Deserialize)]
+pub struct Settings {
+    pub database: DatabaseSettings,
+    pub application_port: u16,
+}
+
+#[derive(serde::Deserialize)]
+pub struct DatabaseSettings {
+    pub username: String,
+    pub password: String,
+    pub port: u16,
+    pub host: String,
+    pub database_name: String,
+}
+
+pub fn get_configuration() -> Result<Settings, config::ConfigError> {
+    // initialise config reader
+    let settings = config::Config::builder()
+        .add_source(
+            config::File::new("configuration.yaml", config::FileFormat::Yaml)
+        )
+        .build()?;
+    settings.try_deserialize::<Settings>()
+}
+
+impl DatabaseSettings {
+    pub fn connection_string(&self) -> String {
+        format!(
+            "postgres://{}:{}@{}:{}/{}",
+            self.username, self.password, self.host, self.port, self.database_name
+        )
+    }
+}

src/lib.rs

@@ -1,17 +1,3 @@
-use actix_web::{web, App, HttpResponse, HttpServer};
-use actix_web::dev::Server;
-use std::net::TcpListener;
-
-async fn health_check() -> HttpResponse {
-    HttpResponse::Ok().finish()
-}
-
-pub fn run(listener: TcpListener) -> Result<Server, std::io::Error> {
-    let server = HttpServer::new(|| {
-        App::new()
-            .route("/health_check", web::get().to(health_check))
-        })
-        .listen(listener)?
-        .run();
-    Ok(server)
-}
+pub mod configuration;
+pub mod routes;
+pub mod startup;

src/main.rs

@@ -1,10 +1,11 @@
-use mail_app::run;
-
 use std::net::TcpListener;
+use mail_app::startup::run;
+use mail_app::configuration::get_configuration;
 
 #[tokio::main]
 async fn main() -> Result<(), std::io::Error> {
-    let listener = TcpListener::bind("127.0.0.1:8000")
-        .expect("Failed to bind to port 8000");
+    let configuration = get_configuration().expect("Failed to read config");
+    let address = format!("127.0.0.1:{}", configuration.application_port);
+    let listener = TcpListener::bind(address)?;
     run(listener)?.await
 }

src/routes/health_check.rs

@@ -0,0 +1,5 @@
+use actix_web::HttpResponse;
+
+pub async fn health_check() -> HttpResponse {
+    HttpResponse::Ok().finish()
+}

src/routes/mod.rs

@@ -0,0 +1,5 @@
+mod health_check;
+mod subscriptions;
+
+pub use health_check::*;
+pub use subscriptions::*;

src/routes/subscriptions.rs

@@ -0,0 +1,11 @@
+use actix_web::{web, HttpResponse};
+
+#[derive(serde::Deserialize)]
+pub struct FormData {
+    email: String,
+    name: String,
+}
+
+pub async fn subscribe(_form: web::Form<FormData>) -> HttpResponse {
+    HttpResponse::Ok().finish()
+}

src/startup.rs

@@ -0,0 +1,15 @@
+use actix_web::{web, App, HttpServer};
+use actix_web::dev::Server;
+use std::net::TcpListener;
+use crate::routes::{health_check, subscribe};
+
+pub fn run(listener: TcpListener) -> Result<Server, std::io::Error> {
+    let server = HttpServer::new(|| {
+        App::new()
+            .route("/health_check", web::get().to(health_check))
+            .route("/subscriptions", web::post().to(subscribe))
+        })
+        .listen(listener)?
+        .run();
+    Ok(server)
+}

tests/health_check.rs

@@ -1,4 +1,17 @@
 use std::net::TcpListener;
+use sqlx::{PgConnection, Connection};
+use mail_app::startup::run;
+use mail_app::configuration::get_configuration;
+
+fn spawn_app() -> String {
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind to random port.");
+    let port = listener.local_addr().unwrap().port();
+    let server = run(listener).expect("Failed to bind address");
+    // Launch in background
+    let _spawn = tokio::spawn(server);
+
+    format!("http://127.0.0.1:{}", port)
+}
 
 #[tokio::test]
 async fn health_check_works() {
@@ -18,13 +31,66 @@ async fn health_check_works() {
     assert_eq!(Some(0), response.content_length());
 }
 
-fn spawn_app() -> String {
-    let listener = TcpListener::bind("127.0.0.1:0")
-        .expect("Failed to bind to random port.");
-    let port = listener.local_addr().unwrap().port();
-    let server = mail_app::run(listener).expect("Failed to bind address");
-    // Launch in background
-    let _spawn = tokio::spawn(server);
+#[tokio::test]
+async fn subscribe_returns_a_200_for_valid_form_data() {
+    // Arrange
+    let app_address = spawn_app();
+    let configuration = get_configuration().expect("Failed to get config");
+    let connection_string = configuration.database.connection_string();
+    let mut connection = PgConnection::connect(&connection_string)
+        .await
+        .expect("Failed to connect to Postgres Database.");
+    let client = reqwest::Client::new();
 
-    format!("http://127.0.0.1:{}", port)
+    // Act
+    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
+    let response = client
+        .post(&format!("{}/subscriptions", &app_address))
+        .header("Content-Type", "application/x-www-form-urlencoded")
+        .body(body)
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    // Assert
+    assert_eq!(200, response.status().as_u16());
+
+    let saved = sqlx::query!("SELECT email, name FROM subscriptions",)
+        .fetch_one(&mut connection)
+        .await
+        .expect("Failed to fetch saved subscription.");
+    
+    assert_eq!(saved.email, "ursula_le_guin@gmail.com");
+    assert_eq!(saved.name, "le guin");
+}
+
+#[tokio::test]
+async fn subscribe_returns_a_400_when_data_is_missing() {
+    // Arrange
+    let app_address = spawn_app();
+    let client = reqwest::Client::new();
+    let test_cases = vec![
+        ("name=le%20guin", "missing email"),
+        ("email=ursula_le_guin%40gmail.com", "missing name"),
+        ("", "missing both name and email"),
+    ];
+
+    for (invalid_body, error_message) in test_cases {
+        // Act
+        let response = client
+            .post(&format!("{}/subscriptions", &app_address))
+            .header("Content-Type", "application/x-www-form-urlencoded")
+            .body(invalid_body)
+            .send()
+            .await
+            .expect("Failed to execute request.");
+
+        // Assert
+        assert_eq!(
+            400,
+            response.status().as_u16(),
+            "The API id not fail wth 400 Bad Request when the payload was {}.",
+            error_message
+        );
+    }
 }