From 129452d1b670e2747d02e098ac07e2f6383529b2 Mon Sep 17 00:00:00 2001
From: Jin Dong <jin.dong@databricks.com>
Date: Sat, 23 Mar 2024 20:31:49 -0700
Subject: [PATCH] ch3: health check endpoint

Signed-off-by: Jin Dong <jin.dong@databricks.com>
---
 Cargo.lock            | 1902 +++++++++++++++++++++++++++++++++++++++++
 Cargo.toml            |   14 +
 src/lib.rs            |   27 +
 src/main.rs           |    8 +-
 tests/health_check.rs |   74 ++
 5 files changed, 2023 insertions(+), 2 deletions(-)
 create mode 100644 src/lib.rs
 create mode 100644 tests/health_check.rs

diff --git a/Cargo.lock b/Cargo.lock
index 3ab02d2..a3a1829 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,1908 @@
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+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5eee091590e89cc02ad514ffe3ead9eb6b660aedca2183455434b93546371a03"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ca79f2451b49fa9e2af39f0747fe999fcda4f5e241b2898624dca97a1f2177"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32b752e52a2da0ddfbdbcc6fceadfeede4c939ed16d13e648833a61dfb611ed8"
+
+[[package]]
+name = "winreg"
+version = "0.50.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
+dependencies = [
+ "cfg-if",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "zero2prod"
 version = "0.1.0"
+dependencies = [
+ "actix-web",
+ "reqwest",
+ "tokio",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.7.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74d4d3961e53fa4c9a25a8637fc2bfaf2595b3d3ae34875568a5cf64787716be"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.53",
+]
+
+[[package]]
+name = "zstd"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bffb3309596d527cfcba7dfc6ed6052f1d39dfbd7c867aa2e865e4a449c10110"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43747c7422e2924c11144d5229878b98180ef8b06cca4ab5af37afc8a8d8ea3e"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.9+zstd.1.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e16efa8a874a0481a574084d34cc26fdb3b99627480f785888deb6386506656"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 871fc6a..4c935f0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,4 +5,18 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+path = "src/lib.rs"
+
+# you can have multiple binaries in a project (thus [[bin]]), but only one library
+# (unless use the workspace feature)
+[[bin]]
+path = "src/main.rs"
+name = "zero2prod"
+
 [dependencies]
+actix-web = "4.5.1"
+tokio = { version = "1.36.0", features = ["macros", "rt-multi-thread"] }
+
+[dev-dependencies]
+reqwest = "0.12.1"
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..53dd1a6
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,27 @@
+use std::net::TcpListener;
+
+use actix_web::dev::Server;
+use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer, Responder};
+
+async fn greet(req: HttpRequest) -> impl Responder {
+    let name = req.match_info().get("name").unwrap_or("World");
+    format!("Hello {}!", &name)
+}
+
+async fn health_check(_req: HttpRequest) -> impl Responder {
+    HttpResponse::Ok().finish()
+}
+
+// `async` is no longer needed as we don't have .await calls.
+pub fn run(listener: TcpListener) -> Result<Server, std::io::Error> {
+    let server = HttpServer::new(|| {
+        App::new()
+            // .route("/", web::get().to(greet))
+            // .route("/{name}", web::get().to(greet))
+            .route("/health_check", web::get().to(health_check))
+    })
+    .listen(listener)?
+    .run();
+
+    Ok(server)
+}
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..e659abd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,7 @@
-fn main() {
-    println!("Hello, world!");
+use zero2prod::run;
+
+#[tokio::main]
+async fn main() -> Result<(), std::io::Error> {
+    let listener = std::net::TcpListener::bind("127.0.0.1:8000")?;
+    run(listener)?.await
 }
diff --git a/tests/health_check.rs b/tests/health_check.rs
new file mode 100644
index 0000000..a953f92
--- /dev/null
+++ b/tests/health_check.rs
@@ -0,0 +1,74 @@
+use std::net::TcpListener;
+
+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 = zero2prod::run(listener).expect("Failed to bind address");
+    // Launch the server as a background task
+    // tokio::spawn returns a handle to the spawned future,
+    // but we have no use for it here, hence the non-binding let
+    let _ = tokio::spawn(server);
+    format!("http://127.0.0.1:{}", port)
+}
+
+#[tokio::test]
+async fn health_check_works() {
+    let address = spawn_app();
+    let client = reqwest::Client::new();
+
+    let resp = client
+        .get(&format!("{}/health_check", &address))
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    assert!(resp.status().is_success());
+    print!("{:?}", resp.content_length());
+    assert_eq!(Some(0), resp.content_length());
+}
+
+#[tokio::test]
+async fn subscribe_returns_200_for_valid_form_data() {
+    let address = spawn_app();
+    let client = reqwest::Client::new();
+
+    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
+    let resp = client
+        .post(&format!("{}/subscriptions", &address))
+        .header("Content-Type", "application/x-www-form-urlencoded")
+        .body(body)
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    assert_eq!(200, resp.status().as_u16());
+}
+
+#[tokio::test]
+async fn subscribe_returns_400_for_invalid_form_data() {
+    let address = spawn_app();
+    let client = reqwest::Client::new();
+
+    let test_cases = vec![
+        ("name=le%20guin", "missing the email"),
+        ("email=ursula_le_guin%40gmail.com", "missing the name"),
+        ("", "missing both name and email"),
+    ];
+
+    for (invalid_body, err_msg) in test_cases {
+        let resp = client
+            .post(&format!("{}/subscriptions", &address))
+            .header("Content-Type", "application/x-www-form-urlencoded")
+            .body(invalid_body)
+            .send()
+            .await
+            .expect("Failed to execute request.");
+
+        assert_eq!(
+            400,
+            resp.status().as_u16(),
+            "The API did not fail with 400 Bad Request when the payload was {}.",
+            err_msg
+        );
+    }
+}