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use std::io;
use std::io::Write;
use conduit::Handler;
use snafu::{ResultExt, Snafu};
use crate::request;
const HTTP_VERSION: &'static str = "HTTP/1.1";
#[derive(Debug, Snafu)]
pub enum Error {
#[snafu(display("{}", source))]
WriteError { source: io::Error },
#[snafu(display("Couldn't build request: {}", source))]
RequestBuilder { source: request::Error },
#[snafu(display("Couldn't parse response: {}", source))]
ConduitResponse { source: conduit::BoxError },
}
pub struct Server;
impl Server {
pub fn start<H: Handler + 'static + Sync>(handler: H) -> io::Result<Server> {
fastcgi::run(move |mut raw_request| {
match handle_request(&mut raw_request, &handler) {
Ok(_) => (),
// TODO: log
// Ignore write errors as clients will have closed the
// connection by this point.
Err(Error::WriteError { .. }) => (),
Err(Error::RequestBuilder { .. }) =>
internal_server_error(&mut raw_request.stdout()),
Err(Error::ConduitResponse { .. }) =>
internal_server_error(&mut raw_request.stdout()),
}
});
Ok(Server{})
}
}
fn handle_request<H>(
mut raw_request: &mut fastcgi::Request,
handler: &H,
) -> Result<(), Error>
where H: Handler + 'static + Sync
{
let mut request = request::FastCgiRequest::new(&mut raw_request)
.context(RequestBuilder)?;
let response = handler.call(&mut request);
let mut stdout = raw_request.stdout();
let (head, body) = response
.context(ConduitResponse)?
.into_parts();
write!(
&mut stdout,
"{} {} {}\r\n",
HTTP_VERSION,
head.status.as_str(),
head.status.canonical_reason().unwrap_or("UNKNOWN"),
)
.context(WriteError)?;
for (name, value) in head.headers.iter() {
write!(&mut stdout, "{}: ", name).context(WriteError)?;
stdout.write(value.as_bytes()).context(WriteError)?;
stdout.write(b"\r\n").context(WriteError)?;
}
stdout.write(b"\r\n").context(WriteError)?;
match body {
conduit::Body::Static(slice) => stdout.write(slice).map(|_| ()).context(WriteError)?,
conduit::Body::Owned(vec) => stdout.write(&vec).map(|_| ()).context(WriteError)?,
conduit::Body::File(mut file) => io::copy(&mut file, &mut stdout).map(|_| ()).context(WriteError)?,
};
Ok(())
}
fn internal_server_error<W: Write>(mut w: W) {
let code = conduit::StatusCode::INTERNAL_SERVER_ERROR;
write!(
w,
"{} {} {}\r\n{}\r\n\r\n",
HTTP_VERSION,
code,
code.canonical_reason().unwrap_or_default(),
"Content-Length: 0",
)
.unwrap_or(())
}
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