rocket with db connection and thiserror

.gitignore

@@ -0,0 +1,2 @@
+/target
+/db

Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "crab-forum"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sled = "0.34"
+rocket = "0.5.0-rc.1"
+thiserror = "1.0.30"

src/main.rs

@@ -0,0 +1,59 @@
+use std::{default::{self }, io::Cursor};
+
+use rocket::{Request, Response, State, http::{ContentType, Status}, response};
+use sled::{Db, IVec};
+use thiserror::Error;
+use rocket::response::Responder;
+
+#[macro_use] extern crate rocket;
+
+#[get("/")]
+fn index() -> &'static str {
+    "Hello, world!"
+}
+
+#[get("/append")]
+fn append(db: &State<Db>) -> Result<String, AppendFailures> {
+    const key: &str = "test_nums";
+    let value = db.generate_id().unwrap();
+    let mut result: Vec<u8> = match db.get(key)? {
+        Some(r) => r.to_vec(),
+        None => Default::default()
+    };
+    result.push(69);
+    let response = format!("it's {:?}", result);
+    db.insert(key, result)?;
+
+
+
+    return Ok(response)
+
+}
+
+#[derive(Error, Debug)]
+enum AppendFailures {
+    #[error("db error {0}")]
+    DbError(#[from] sled::Error)
+
+}
+
+impl<'r> Responder<'r, 'static> for AppendFailures {
+    fn respond_to(self, _: &'r Request<'_>) -> response::Result<'static> {
+        let error_msg: String = format!("Error: {:?}", self).into();
+        Response::build()
+            .header(ContentType::Plain)
+            .sized_body(error_msg.len(), Cursor::new(error_msg))
+            .status(Status {
+                code: 500,
+            })
+            .ok()
+    }
+
+}
+
+#[launch]
+fn rocket() -> _ {
+    rocket::build()
+    .manage(sled::open("db").unwrap())
+    .mount("/", routes![index, append])
+}