mirror of
https://github.com/tokio-rs/axum.git
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109 lines
3 KiB
Rust
109 lines
3 KiB
Rust
//! Run with
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//!
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//! ```not_rust
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//! cargo run -p example-tokio-postgres
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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 bb8::{Pool, PooledConnection};
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use bb8_postgres::PostgresConnectionManager;
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use std::net::SocketAddr;
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use tokio_postgres::NoTls;
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use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
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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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// set up connection pool
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let manager =
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PostgresConnectionManager::new_from_stringlike("host=localhost user=postgres", NoTls)
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.unwrap();
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let pool = Pool::builder().build(manager).await.unwrap();
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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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type ConnectionPool = Pool<PostgresConnectionManager<NoTls>>;
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async fn using_connection_pool_extractor(
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State(pool): State<ConnectionPool>,
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) -> Result<String, (StatusCode, String)> {
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let conn = pool.get().await.map_err(internal_error)?;
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let row = conn
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.query_one("select 1 + 1", &[])
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.await
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.map_err(internal_error)?;
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let two: i32 = row.try_get(0).map_err(internal_error)?;
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Ok(two.to_string())
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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(PooledConnection<'static, PostgresConnectionManager<NoTls>>);
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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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ConnectionPool: 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 = ConnectionPool::from_ref(state);
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let conn = pool.get_owned().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 row = conn
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.query_one("select 1 + 1", &[])
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.await
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.map_err(internal_error)?;
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let two: i32 = row.try_get(0).map_err(internal_error)?;
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Ok(two.to_string())
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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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