tutorial running

db.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS todo
+(
+    id SERIAL PRIMARY KEY NOT NULL,
+    name VARCHAR(255),
+    created_at timestamp with time zone DEFAULT (now() at time zone 'utc'),
+    checked boolean DEFAULT false
+);

src/db.rs

@@ -1,13 +1,32 @@
 use crate::{DBCon, DBPool};
+use mobc::{Pool};
 use mobc_postgres::{tokio_postgres, PgConnectionManager};
 use tokio_postgres::{Config, Error, NoTls};
 use std::fs;
 use std::str::FromStr;
 use std::time::Duration;
+use crate::error::Error::{*};
+use crate::error;
+
+type Result<T> = std::result::Result<T, error::Error>;
 
 const DB_POOL_MAX_OPEN: u64 = 32;
 const DB_POOL_MAX_IDLE: u64 = 8;
 const DB_POOL_TIMEOUT_SECONDS: u64 = 15;
+const INIT_SQL: &str = "./db.sql";
+
+pub async fn init_db(db_pool: &DBPool) -> Result<()> {
+    let init_file = fs::read_to_string(INIT_SQL)?;
+    let con = get_db_con(db_pool).await?;
+    con.batch_execute(init_file.as_str())
+        .await
+        .map_err(DBInitError)?;
+    Ok(())
+}
+
+pub async fn get_db_con(db_pool: &DBPool) -> Result<DBCon> {
+    db_pool.get().await.map_err(DBPoolError)
+}
 
 pub fn create_pool() -> std::result::Result<DBPool, mobc::Error<Error>> {
     let config = Config::from_str("postgres://postgres@127.0.0.1:7878/postgres")?;
@@ -19,3 +38,8 @@ pub fn create_pool() -> std::result::Result<DBPool, mobc::Error<Error>> {
         .get_timeout(Some(Duration::from_secs(DB_POOL_TIMEOUT_SECONDS)))
         .build(manager))
 }
+
+  
+
+
+

src/db.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS todo
+(
+    id SERIAL PRIMARY KEY NOT NULL,
+    name VARCHAR(255),
+    created_at timestamp with time zone DEFAULT (now() at time zone 'utc'),
+    checked boolean DEFAULT false
+);

src/error.rs

@@ -0,0 +1,64 @@
+use mobc_postgres::tokio_postgres;
+use serde::{Serialize, Deserialize};
+use thiserror::Error;
+use warp::{http::StatusCode, Filter,Rejection,Reply};
+use crate::Infallible;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("error getting connection from DB pool: {0}")]
+    DBPoolError(mobc::Error<tokio_postgres::Error>),
+    #[error("error executing DB query: {0}")]
+    DBQueryError(#[from] tokio_postgres::Error),
+    #[error("error creating table: {0}")]
+    DBInitError(tokio_postgres::Error),
+    #[error("error reading file: {0}")]
+    ReadFileError(#[from] std::io::Error),
+}
+
+impl warp::reject::Reject for Error {}
+
+#[derive(Serialize)]
+struct ErrorResponse {
+    message: String,
+}
+
+pub async fn handle_rejection(err: Rejection) -> std::result::Result<impl Reply, Infallible> {
+    let code;
+    let message;
+
+    if err.is_not_found() {
+            code = StatusCode::NOT_FOUND;
+            message = "Not Found";
+    } else if let Some(_) = err.find::<warp::filters::body::BodyDeserializeError>() {
+            code = StatusCode::BAD_REQUEST;
+            message = "Invalid Body";
+    } else if let Some(e) = err.find::<Error>() {
+            match e {
+                Error::DBQueryError(_) => {
+                    code = StatusCode::BAD_REQUEST;
+                    message = "Could not Execute request";
+                }
+                _ => {
+                    eprintln!("unhandled application error: {:?}", err);
+                    code = StatusCode::INTERNAL_SERVER_ERROR;
+                    message = "Internal Server Error";
+                }
+            }
+    } else if let Some(_) = err.find::<warp::reject::MethodNotAllowed>() {
+            code = StatusCode::METHOD_NOT_ALLOWED;
+            message = "Method Not Allowed";
+    } else {
+            eprintln!("unhandled error: {:?}", err);
+            code = StatusCode::INTERNAL_SERVER_ERROR;
+            message = "Internal Server Error";
+    }
+
+    let json = warp::reply::json(&ErrorResponse {
+            message: message.into(),
+    });
+
+    Ok(warp::reply::with_status(json, code))
+}
+
+

src/handler.rs

@@ -0,0 +1,14 @@
+use crate::{db, DBPool};
+use crate::error::Error::{*};
+use warp::{http::StatusCode, reject, Reply, Rejection};
+
+pub async fn health_handler(db_pool: DBPool) -> std::result::Result<impl Reply, Rejection> {
+    let db = db::get_db_con(&db_pool)
+            .await
+            .map_err(|e| reject::custom(e))?;
+
+    db.execute("SELECT 1", &[])
+            .await
+            .map_err(|e| reject::custom(DBQueryError(e)))?;
+    Ok(StatusCode::OK)
+}

src/main.rs

@@ -1,21 +1,34 @@
 // mod data;
-// mod db;
-// mod error;
-// mod handler;
+mod db;
+mod error;
+mod handler;
 
-use warp::{http::StatusCode, Filter};
+use warp::{http::StatusCode, Filter,Rejection};
 use mobc::{Connection, Pool};
 use mobc_postgres::{tokio_postgres, PgConnectionManager};
 use tokio_postgres::NoTls;
+use std::convert::Infallible;
 
 type DBCon = Connection<PgConnectionManager<NoTls>>;
 type DBPool = Pool<PgConnectionManager<NoTls>>;
 
 #[tokio::main]
 async fn main() {
+    let db_pool = db::create_pool().expect("database pool can be created");
+
+    db::init_db(&db_pool)
+        .await
+        .expect("database can be initialized");
+
     let health_route = warp::path!("health")
-        .map(|| StatusCode::OK);
+        .and(with_db(db_pool.clone()))
+        .and_then(handler::health_handler);
     let routes = health_route
-        .with(warp::cors().allow_any_origin());
+        .with(warp::cors().allow_any_origin())
+        .recover(error::handle_rejection);
     warp::serve(routes).run(([127, 0, 0, 1], 8000)).await;
 }
+
+fn with_db(db_pool: DBPool) -> impl Filter<Extract = (DBPool,), Error = Infallible> + Clone {
+    warp::any().map(move || db_pool.clone())
+}