From 19da6ec39be9e3caa5b9e2766139684fd7bbe0a0 Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Tue, 27 Dec 2022 23:24:54 +0000
Subject: Initial comments impl for my blog

---
 comments/src/main.rs | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 comments/src/main.rs

(limited to 'comments/src/main.rs')

diff --git a/comments/src/main.rs b/comments/src/main.rs
new file mode 100644
index 0000000..312dafa
--- /dev/null
+++ b/comments/src/main.rs
@@ -0,0 +1,143 @@
+/**
+ * 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())
+}
-- 
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