Improve error handling (#33)

* refactor: improve error handling

* fix: specify bind address instead of port

* fix: remove temporary testing file

* fix(errors): change error names to snake_case

* refactor(errors): split indexing error types, remove unused errors

* feat: add env variable checking at program start

This just checks whether the enviroment variables exist and can
parse to the given type and gives a warning if they can't. This
should prevent cases where the program fails at runtime due to
checking an environment variable that doesn't exist.

src/routes/mods.rs

@@ -1,13 +1,10 @@
 use crate::models::mods::SearchRequest;
-use crate::search::search_for_mod;
+use crate::search::{search_for_mod, SearchError};
 use actix_web::{get, web, HttpResponse};
 
 #[get("api/v1/mods")]
-pub fn mod_search(web::Query(info): web::Query<SearchRequest>) -> HttpResponse {
-    //TODO: Fix this line with anyhow
-    let body = serde_json::to_string(&search_for_mod(&info).unwrap()).unwrap();
-
-    HttpResponse::Ok()
-        .content_type("application/json")
-        .body(body)
+pub async fn mod_search(
+    web::Query(info): web::Query<SearchRequest>,
+) -> Result<HttpResponse, SearchError> {
+    Ok(HttpResponse::Ok().json(search_for_mod(&info)?))
 }