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use futures_util::TryStreamExt;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Method, Request, Response, Server, StatusCode};
use nanoid::nanoid;
use rusqlite::{params, Connection, OpenFlags, Result, NO_PARAMS};
use url::form_urlencoded;
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::str::from_utf8;
fn shorten<S: AsRef<str>>(url: S, conn: &mut Connection) -> Result<String> {
let mut stmt = conn.prepare("select * from urls where link = ?1")?;
let mut rows = stmt.query(params![url.as_ref().to_string()])?;
if let Some(row) = rows.next()? {
return row.get(1);
} else {
let new_id = nanoid!(4);
conn.execute(
"insert into urls (link, shortlink) values (?1, ?2)",
params![url.as_ref().to_string(), new_id],
)?;
return Ok(new_id);
}
}
fn get_link<S: AsRef<str>>(url: S, conn: &mut Connection) -> Result<Option<String>> {
eprintln!("{}", url.as_ref());
let url = url.as_ref();
let mut stmt = conn.prepare("select * from urls where shortlink = ?1")?;
let mut rows = stmt.query(params![url.to_string()])?;
if let Some(row) = rows.next()? {
return Ok(row.get(0)?);
} else {
return Ok(None);
}
}
async fn shortner_service(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
let mut conn = init_db("./urls.db_3").unwrap();
match req.method() {
&Method::POST => {
let b = hyper::body::to_bytes(req).await?;
let params = form_urlencoded::parse(b.as_ref())
.into_owned()
.collect::<HashMap<String, String>>();
if let Some(n) = params.get("shorten") {
let shortlink = shorten(n, &mut conn).unwrap();
return Ok(Response::new(Body::from(shortlink)));
} else {
return Ok(Response::new(Body::from("invalid form")));
};
}
&Method::GET => {
let shortlink = req.uri().path().to_string();
let link = get_link(&shortlink[1..], &mut conn);
if let Some(l) = link.unwrap() {
return Ok(Response::new(Body::from(l)));
} else {
return Ok(Response::new(Body::from("not found!")));
}
}
_ => unimplemented!(),
}
}
fn init_db<P: AsRef<Path>>(p: P) -> Result<Connection> {
let conn = Connection::open_with_flags(
p,
OpenFlags::SQLITE_OPEN_CREATE | OpenFlags::SQLITE_OPEN_READ_WRITE,
)?;
conn.execute(
"CREATE TABLE IF NOT EXISTS urls (
link TEXT PRIMARY KEY,
shortlink TEXT NOT NULL
)",
params![],
)?;
return Ok(conn);
}
#[tokio::main]
async fn main() -> Result<()> {
let addr = ([127, 0, 0, 1], 3000).into();
let service =
make_service_fn(|_| async { Ok::<_, hyper::Error>(service_fn(shortner_service)) });
let server = Server::bind(&addr).serve(service);
println!("Listening on http://{}", addr);
server.await.unwrap();
Ok(())
}
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