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AsyncWriteExt, BufReader}; +use strum::EnumString; +use tokio::time::Duration; + +const PORT: u16 = 8080; +static STATUS_TEXT: phf::Map<&str, u8> = phf_map! { + "OK" => 200 +}; + +#[derive(Debug, EnumString)] +#[strum(ascii_case_insensitive)] +enum HttpVerb { + GET, + HEAD, + POST, + PUT, + DELETE, + CONNECT, + OPTIONS, + TRACE, + PATCH +} + +#[derive(Debug)] +struct Request { + verb: HttpVerb, + route: String, + protocol_version: f32, + headers: HashMap +} + +struct Response { + protocol_version: f32, + status_code: u16, + headers: HashMap, + body: Option +} + +impl Display for Response { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + let status_text = *STATUS_TEXT.entries().find(|(_, entry)| **entry as u16 == self.status_code).map(|(key, _)| key).unwrap_or(&"N/A"); + write!(f, "{}\n", format!("HTTP/{} {} {}", self.protocol_version, self.status_code, status_text))?; + + for (name, value) in &self.headers { + write!(f, "{}\n", format!("{}: {}", name, value))?; + } + + if let Some(body) = &self.body { + write!(f, "\n{}", body) + } else { + Ok(()) + } + } +} + +#[tokio::main] +async fn main() -> Result<()> { + color_eyre::install()?; + + let listener = TcpListener::bind(format!("0.0.0.0:{PORT}")).await?; + println!("Listening on port {PORT}"); + + loop { + // read http request + let (mut socket, _) = listener.accept().await?; + + // todo: thread pool + tokio::spawn(async move { + let buf_reader = BufReader::new(&mut socket); + let mut lines = { + let mut vec = Vec::new(); + let mut stream = buf_reader.lines(); + while let Some(line) = stream.next_line().await? { + if line.is_empty() { + break + } + vec.push(line); + } + vec + }; + println!("{:?}", lines); + + // parse http request + let (verb, route, protocol_version) = { + let start_line = lines.remove(0); + let seg: Vec<_> = start_line.split(" ").collect(); + (HttpVerb::from_str(&seg[0])?, seg[1].to_string(), seg[2].split("/").last().map(|ver| ver.parse::().ok()).flatten().ok_or(eyre!("Error parsing HTTP version"))?) + }; + let headers = lines.iter() + .map(|header| { + let mut header = header.split(":").collect::>(); + let name = header.remove(0); + let value = header.join(":"); + (name.to_string(), value.trim().to_string()) + }) + .collect::>(); + + let request = Request { + verb, + route, + protocol_version, + headers + }; + + // respond to http request + match request.verb { + HttpVerb::GET => { + let response = match request.route.as_str() { + "/" => Response { + protocol_version, + status_code: 200, + headers: { + let mut headers = HashMap::new(); + headers.insert("Content-Type".to_string(), "text/html".to_string()); + headers + }, + body: Some("

Hello World!

".to_string()) + }, + + // 404 + _ => Response { + protocol_version, + status_code: 404, + headers: HashMap::new(), + body: None + } + }; + + println!("{:?}", response.to_string()); + socket.write_all(response.to_string().as_bytes()).await?; + } + _ => unimplemented!() + } + + socket.shutdown().await?; + + // sleep for a short duration to avoid busy-waiting + tokio::time::sleep(Duration::from_millis(100)).await; + color_eyre::eyre::Ok(()) + }); + } + + Ok(()) +}