use sqlx example
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Joe Ardent
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17
Cargo.toml
17
Cargo.toml
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@ -1,17 +1,18 @@
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[package]
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name = "shwatchit"
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version = "0.1.0"
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name = "witch_watch"
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version = "0.0.1"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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axum = "0.5"
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askama = "0.11"
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axum = { version = "0.6", features = ["macros", "tracing"] }
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askama = { version = "0.12", features = ["with-axum"] }
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askama_axum = "0.3"
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axum-macros = "0.3"
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tokio = { version = "1", features = ["full"] }
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tracing = "0.1"
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tracing-subscriber = { version = "0.3", features = ["env-filter"] }
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tower = { version = "0.4", features = ["util", "timeout"] }
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tower-http = { version = "0.2", features = ["add-extension", "trace"] }
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uuid = { version = "0.8", features = ["serde", "v4"] }
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tower-http = { version = "0.4", features = ["add-extension", "trace"] }
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uuid = { version = "1.3", features = ["serde", "v4"] }
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serde = { version = "1", features = ["derive"] }
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sqlx = { version = "0.5.10", features = ["runtime-tokio-rustls", "any", "sqlite", "chrono", "time", "uuid"] }
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225
src/main.rs
225
src/main.rs
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@ -1,176 +1,119 @@
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//! Provides a RESTful web server managing some Todos.
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//!
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//! API will be:
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//!
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//! - `GET /todos`: return a JSON list of Todos.
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//! - `POST /todos`: create a new Todo.
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//! - `PUT /todos/:id`: update a specific Todo.
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//! - `DELETE /todos/:id`: delete a specific Todo.
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//! Example of application using <https://github.com/launchbadge/sqlx>
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//!
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//! Run with
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//!
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//! ```not_rust
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//! cargo run -p example-todos
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//! cargo run -p example-sqlx-postgres
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//! ```
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//!
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//! Test with curl:
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//!
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//! ```not_rust
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//! curl 127.0.0.1:3000
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//! curl -X POST 127.0.0.1:3000
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//! ```
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use std::{
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collections::HashMap,
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net::SocketAddr,
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sync::{Arc, RwLock},
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time::Duration,
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};
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use std::{net::SocketAddr, time::Duration};
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use axum::{
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error_handling::HandleErrorLayer,
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extract::{Extension, Path, Query},
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http::StatusCode,
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response::IntoResponse,
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routing::{get, patch},
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Json, Router,
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async_trait,
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extract::{FromRef, FromRequestParts, State},
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http::{request::Parts, StatusCode},
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routing::get,
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Router,
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};
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use serde::{Deserialize, Serialize};
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use tower::{BoxError, ServiceBuilder};
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use tower_http::trace::TraceLayer;
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use sqlx::{
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sqlite::{SqliteConnectOptions, SqlitePool, SqlitePoolOptions},
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types::uuid::adapter::Hyphenated,
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};
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use tokio::net::TcpListener;
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use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
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use uuid::Uuid;
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mod form;
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mod template;
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#[tokio::main]
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async fn main() {
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tracing_subscriber::registry()
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.with(tracing_subscriber::EnvFilter::new(
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std::env::var("RUST_LOG")
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.unwrap_or_else(|_| "example_todos=debug,tower_http=debug".into()),
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))
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.with(
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tracing_subscriber::EnvFilter::try_from_default_env()
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.unwrap_or_else(|_| "example_tokio_postgres=debug".into()),
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)
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.with(tracing_subscriber::fmt::layer())
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.init();
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let db = Db::default();
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let db_connection_str = std::env::var("DATABASE_URL")
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.unwrap_or_else(|_| "postgres://postgres:password@localhost".to_string());
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// Compose the routes
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// setup connection pool
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let pool = SqlitePoolOptions::new()
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.max_connections(5)
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.connect_timeout(Duration::from_secs(3))
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.connect(&db_connection_str)
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.await
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.expect("can't connect to database");
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// build our application with some routes
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let app = Router::new()
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.route("/todos", get(todos_index).post(todos_create))
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.route("/todos/:id", patch(todos_update).delete(todos_delete))
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.route("/greet/:name", get(template::greet))
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.route("/", get(form::show_form).post(form::accept_form))
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// Add middleware to all routes
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.layer(
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ServiceBuilder::new()
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.layer(HandleErrorLayer::new(|error: BoxError| async move {
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if error.is::<tower::timeout::error::Elapsed>() {
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Ok(StatusCode::REQUEST_TIMEOUT)
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} else {
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Err((
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StatusCode::INTERNAL_SERVER_ERROR,
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format!("Unhandled internal error: {}", error),
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))
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}
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}))
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.timeout(Duration::from_secs(10))
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.layer(TraceLayer::new_for_http())
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.layer(Extension(db))
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.into_inner(),
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);
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.route(
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"/",
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get(using_connection_pool_extractor).post(using_connection_extractor),
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)
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.with_state(pool);
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let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
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tracing::debug!("listening on {}", addr);
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axum::Server::bind(&addr)
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// run it with hyper
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let listener = TcpListener::bind("127.0.0.1:3000").await.unwrap();
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tracing::debug!("listening on {}", listener.local_addr().unwrap());
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//axum::serve(listener, app).await.unwrap();
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axum::Server::bind(&SocketAddr::from(([0, 0, 0, 0], 3000)))
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.serve(app.into_make_service())
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.await
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.unwrap();
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}
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// The query parameters for todos index
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#[derive(Debug, Deserialize, Default)]
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pub struct Pagination {
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pub offset: Option<usize>,
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pub limit: Option<usize>,
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// we can extract the connection pool with `State`
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async fn using_connection_pool_extractor(
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State(pool): State<SqlitePool>,
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) -> Result<String, (StatusCode, String)> {
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sqlx::query_scalar("select 'hello world from pg'")
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.fetch_one(&pool)
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.await
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.map_err(internal_error)
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}
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async fn todos_index(
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pagination: Option<Query<Pagination>>,
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Extension(db): Extension<Db>,
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) -> impl IntoResponse {
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let todos = db.read().unwrap();
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// we can also write a custom extractor that grabs a connection from the pool
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// which setup is appropriate depends on your application
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struct DatabaseConnection(sqlx::pool::PoolConnection<sqlx::Sqlite>);
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let Query(pagination) = pagination.unwrap_or_default();
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#[async_trait]
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impl<S> FromRequestParts<S> for DatabaseConnection
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where
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SqlitePool: FromRef<S>,
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S: Send + Sync,
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{
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type Rejection = (StatusCode, String);
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let todos = todos
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.values()
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.skip(pagination.offset.unwrap_or(0))
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.take(pagination.limit.unwrap_or(usize::MAX))
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.cloned()
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.collect::<Vec<_>>();
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async fn from_request_parts(_parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
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let pool = SqlitePool::from_ref(state);
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Json(todos)
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}
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let conn = pool.acquire().await.map_err(internal_error)?;
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#[derive(Debug, Deserialize)]
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struct CreateTodo {
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text: String,
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}
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async fn todos_create(
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Json(input): Json<CreateTodo>,
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Extension(db): Extension<Db>,
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) -> impl IntoResponse {
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let todo = Todo {
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id: Uuid::new_v4(),
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text: input.text,
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completed: false,
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};
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db.write().unwrap().insert(todo.id, todo.clone());
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(StatusCode::CREATED, Json(todo))
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}
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#[derive(Debug, Deserialize)]
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struct UpdateTodo {
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text: Option<String>,
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completed: Option<bool>,
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}
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async fn todos_update(
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Path(id): Path<Uuid>,
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Json(input): Json<UpdateTodo>,
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Extension(db): Extension<Db>,
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) -> Result<impl IntoResponse, StatusCode> {
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let mut todo = db
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.read()
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.unwrap()
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.get(&id)
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.cloned()
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.ok_or(StatusCode::NOT_FOUND)?;
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if let Some(text) = input.text {
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todo.text = text;
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}
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if let Some(completed) = input.completed {
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todo.completed = completed;
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}
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db.write().unwrap().insert(todo.id, todo.clone());
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Ok(Json(todo))
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}
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async fn todos_delete(Path(id): Path<Uuid>, Extension(db): Extension<Db>) -> impl IntoResponse {
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if db.write().unwrap().remove(&id).is_some() {
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StatusCode::NO_CONTENT
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} else {
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StatusCode::NOT_FOUND
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Ok(Self(conn))
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}
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}
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type Db = Arc<RwLock<HashMap<Uuid, Todo>>>;
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#[derive(Debug, Serialize, Clone)]
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struct Todo {
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id: Uuid,
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text: String,
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completed: bool,
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async fn using_connection_extractor(
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DatabaseConnection(conn): DatabaseConnection,
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) -> Result<String, (StatusCode, String)> {
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let mut conn = conn;
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sqlx::query_scalar("select 'hello world from pg'")
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.fetch_one(&mut conn)
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.await
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.map_err(internal_error)
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}
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/// Utility function for mapping any error into a `500 Internal Server Error`
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/// response.
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fn internal_error<E>(err: E) -> (StatusCode, String)
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where
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E: std::error::Error,
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{
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(StatusCode::INTERNAL_SERVER_ERROR, err.to_string())
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}
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