feat: mvp

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newt 2024-09-04 16:09:06 +01:00
commit 2b869c947f
8 changed files with 887 additions and 0 deletions

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12
Cargo.toml Normal file
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@ -0,0 +1,12 @@
[package]
name = "newttp"
publish = false
version = "0.1.0"
edition = "2021"
[dependencies]
color-eyre = "0.6.3"
tokio = { version = "1.40.0", features = ["full"] }
strum = { version = "0.26.3", features = ["derive"] }
phf = { version = "0.11.2", features = ["macros"] }
futures = "0.3.30"

151
src/main.rs Normal file
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@ -0,0 +1,151 @@
use std::collections::HashMap;
use std::fmt::Display;
use std::str::FromStr;
use color_eyre::eyre::eyre;
use tokio::net::TcpListener;
use color_eyre::Result;
use phf::phf_map;
use tokio::io::{AsyncBufReadExt, 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<String, String>
}
struct Response {
protocol_version: f32,
status_code: u16,
headers: HashMap<String, String>,
body: Option<String>
}
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::<f32>().ok()).flatten().ok_or(eyre!("Error parsing HTTP version"))?)
};
let headers = lines.iter()
.map(|header| {
let mut header = header.split(":").collect::<Vec<_>>();
let name = header.remove(0);
let value = header.join(":");
(name.to_string(), value.trim().to_string())
})
.collect::<HashMap<_, _>>();
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("<h1>Hello World!</h1>".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(())
}