add fetch paste route

Signed-off-by: alok8bb <alok8bb@gmail.com>

src/db.rs

@@ -57,9 +57,18 @@ pub async fn paste_id_exists(client: &Client, paste_id: &String) -> Result<bool,
 }
 
 pub async fn add_paste(client: &Client, endpoint: &String, content: String) -> Result<(), MyError> {
-    let insert_stmt_ = format!("INSERT INTO bin.pastes(paste_id, content) VALUES($1, $2)");
-    let insert_stmt = client.prepare(&insert_stmt_).await.unwrap();
+    let stmt_ = format!("INSERT INTO bin.pastes(paste_id, content) VALUES($1, $2)");
+    let stmt = client.prepare(&stmt_).await.unwrap();
 
-    client.query(&insert_stmt, &[&endpoint, &content]).await?;
+    client.query(&stmt, &[&endpoint, &content]).await?;
     Ok(())
 }
+
+pub async fn get_paste(client: &Client, endpoint: &String) -> Result<String, MyError> {
+    let stmt_ = format!("SELECT content FROM bin.pastes WHERE paste_id = $1");
+    let stmt = client.prepare(&stmt_).await.unwrap();
+
+    let content: String = client.query_one(&stmt, &[&endpoint]).await?.get(0);
+
+    Ok(content)
+}

src/main.rs

@@ -2,7 +2,7 @@ mod cfg;
 mod db;
 use crate::db::errors::MyError;
 use actix_web::{
-    post,
+    get, post,
     web::{self},
     App, Error, HttpResponse, HttpServer,
 };
@@ -22,8 +22,24 @@ fn generate_endpoint(length: u8) -> String {
         .collect()
 }
 
+#[get("/paste/{paste_id}")]
+async fn fetch_paste(
+    db_pool: web::Data<Pool>,
+    paste_id: web::Path<String>,
+) -> Result<HttpResponse, Error> {
+    let client: Client = db_pool.get().await.map_err(MyError::PoolError)?;
+    if !db::paste_id_exists(&client, &paste_id).await? {
+        return Ok(HttpResponse::NotFound().json(json!({
+            "message": "paste with specified id does not exist"
+        })));
+    }
+
+    let content = db::get_paste(&client, &paste_id).await?;
+    Ok(HttpResponse::Ok().body(content))
+}
+
 #[post("/paste")]
-async fn paste(db_pool: web::Data<Pool>, body: String) -> Result<HttpResponse, Error> {
+async fn new_paste(db_pool: web::Data<Pool>, body: String) -> Result<HttpResponse, Error> {
     let client: Client = db_pool.get().await.map_err(MyError::PoolError)?;
 
     let mut endpoint = generate_endpoint(5);
@@ -56,7 +72,8 @@ async fn main() -> std::io::Result<()> {
     let server = HttpServer::new(move || {
         App::new()
             .app_data(web::Data::new(pool.clone()))
-            .service(paste)
+            .service(new_paste)
+            .service(fetch_paste)
     })
     .bind(ADDR)?
     .run();