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use std::net::{TcpListener, TcpStream, Shutdown};
use std::io::Write;
use std::str;
use std::fmt;
use crate::request::Request;
use crate::response::Response;
use crate::http_method::HttpMethod;
pub trait HttpHandler {
fn do_get(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_head(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_post(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_put(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_delete(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_connect(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_options(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_trace(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn do_patch(&self, _request: Request) -> Response {
return self.default_action(_request);
}
fn default_action(&self, _request: Request) -> Response {
let msg = String::from("<h1>Method not allowed</h1>");
return Response::html(msg, 405);
}
}
pub struct HttpServer<T: HttpHandler> {
host: String,
port: u16,
socket: TcpListener,
handler: T
}
impl<T> HttpServer<T> where T: HttpHandler {
// TODO(andrew): add explanations for errors?
pub fn new(host: &str, port: u16, handler: T) -> Result<HttpServer<T>, &str> {
let addr = format!("{}:{}", host, port);
let sock = TcpListener::bind(addr);
match sock {
Ok(s) => {
let server = HttpServer {
host: String::from(host),
port: port,
socket: s,
handler: handler,
};
return Ok(server);
},
Err(_) => return Err("Couldn't start server")
};
}
pub fn serve_forever(&self) -> Result<(), &str> {
for stream in self.socket.incoming() {
match stream {
Ok(s) => {
// TODO(andrew): replace println with logging.
println!("Got connection!");
match self.handle_client(&s) {
Ok(_) => (),
Err(msg) => return Err(msg)
};
match s.shutdown(Shutdown::Both) {
Ok(_) => println!("Closed connection"),
Err(_) => return Err("Couldn't close client socket")
};
},
Err(_) => break
};
}
return Ok(());
}
fn handle_client(&self, mut stream: &TcpStream) -> Result<(), &str> {
let mut buf: [u8; 1024] = [0; 1024];
// TODO(andrew): read all body, not first 1024 bytes.
stream.peek(&mut buf).expect("Couldn't read from socket");
let request = Request::from(&buf);
let request = match request {
Some(r) => r,
None => return Err("Request parsed with errors")
};
let response = match request.method {
HttpMethod::GET => self.handler.do_get(request),
HttpMethod::HEAD => self.handler.do_head(request),
HttpMethod::POST => self.handler.do_post(request),
HttpMethod::PUT => self.handler.do_put(request),
HttpMethod::DELETE => self.handler.do_delete(request),
HttpMethod::CONNECT => self.handler.do_connect(request),
HttpMethod::OPTIONS => self.handler.do_options(request),
HttpMethod::TRACE => self.handler.do_trace(request),
HttpMethod::PATCH => self.handler.do_patch(request),
};
let response = response.format();
match stream.write(&response) {
Ok(_) => return Ok(()),
Err(_) => return Err("Couldn't write to client socket")
};
}
}
impl<T> fmt::Display for HttpServer<T> where T: HttpHandler {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
return write!(f, "HttpServer({}:{})", self.host, self.port);
}
}
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