mirror of
https://github.com/tokio-rs/axum.git
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115 lines
3.1 KiB
Rust
115 lines
3.1 KiB
Rust
//! 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-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 axum::{
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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 sqlx::postgres::{PgPool, PgPoolOptions};
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use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
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use std::{net::SocketAddr, time::Duration};
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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(
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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_connection_str = std::env::var("DATABASE_URL")
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.unwrap_or_else(|_| "postgres://postgres:password@localhost".to_string());
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// setup connection pool
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let pool = PgPoolOptions::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(
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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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// run it with hyper
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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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.serve(app.into_make_service())
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.await
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.unwrap();
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}
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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<PgPool>,
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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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// 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::Postgres>);
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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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PgPool: 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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async fn from_request_parts(_parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
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let pool = PgPool::from_ref(state);
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let conn = pool.acquire().await.map_err(internal_error)?;
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Ok(Self(conn))
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}
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}
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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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