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|
/**
* Comments generator
* POST /comment - submits a comment
*
* GET /form - generate html comment form
* GET /comment - gets html fragment with comments
* both accept a query parameter ?page=<url>
*/
use askama::Template;
use axum::{
extract::{Query, Form, State},
response::Redirect,
http::StatusCode,
routing::get,
Router,
debug_handler,
};
use serde::Deserialize;
use sqlx::{
postgres::{PgPool, PgPoolOptions},
types::time::OffsetDateTime,
};
use std::{net::SocketAddr, time::Duration};
// Useful global thingies
#[derive(Clone)]
struct Ctx {
pool: PgPool,
}
#[tokio::main]
async fn main() {
let db_connection_str = std::env::var("DATABASE_URL")
.unwrap_or_else(|_| "postgres://postgres:password@localhost".to_string());
// setup connection pool
let pool = PgPoolOptions::new()
.max_connections(5)
.connect_timeout(Duration::from_secs(3))
.connect(&db_connection_str)
.await
.expect("can't connect to database");
sqlx::migrate!()
.run(&pool)
.await
.expect("failed to run migrations");
let ctx = Ctx {pool};
// build our application with some routes
let app = Router::new()
.route(
"/form",
get(get_form),
)
.route(
"/comment",
get(get_comments).post(post_comments),
)
.with_state(ctx);
// run it with hyper
let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
axum::Server::bind(&addr)
.serve(app.into_make_service())
.await
.unwrap();
}
#[derive(Deserialize)]
struct UrlQuery {
url: String
}
#[derive(Template)]
#[template(path = "form.html")]
struct CommentForm {
url: String
}
async fn get_form(
Query(uq): Query<UrlQuery>,
) -> Result<String, (StatusCode, String)> {
let c = CommentForm{url: uq.url};
let res = c.render().map_err(internal_error)?;
Ok(res)
}
#[derive(Template)]
#[template(path = "comments.html")]
struct Comments {
comments: Vec<Comment>,
}
struct Comment {
author: String,
comment: String,
ts: OffsetDateTime,
}
async fn get_comments(
Query(uq): Query<UrlQuery>,
State(ctx): State<Ctx>) -> Result<String, (StatusCode,String)> {
let comments = sqlx::query!("select author,comment,ts from comments where url = $1", uq.url)
.fetch_all(&ctx.pool)
.await
.map_err(internal_error)?;
let render_comments: Vec<Comment> = comments.into_iter().map(|comment| {
Comment {
author: comment.author,
comment: comment.comment,
ts: comment.ts,
}
}).collect();
let c = Comments{comments: render_comments};
let res = c.render().map_err(internal_error)?;
Ok(res)
}
#[derive(Deserialize)]
struct PostComment {
url: String,
author: String,
comment: String,
}
#[debug_handler]
async fn post_comments(
State(ctx): State<Ctx>,
Form(post_comment): Form<PostComment>) -> Result<Redirect,(StatusCode,String)> {
sqlx::query!("insert into comments(url,author,comment) values($1, $2, $3)", post_comment.url, post_comment.author, post_comment.comment)
.execute(&ctx.pool)
.await
.map_err(internal_error)?;
Ok(Redirect::temporary(&post_comment.url))
}
fn internal_error<E>(err: E) -> (StatusCode, String)
where
E: std::error::Error,
{
(StatusCode::INTERNAL_SERVER_ERROR, err.to_string())
}
|
