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use std::io::{self, Read};
use hyper::{header, server, Decoder, Encoder, Next};
use hyper::net::HttpStream;
use hyper::mime::Mime;
use hyper::status::StatusCode;
use handlers::add_security_headers;
const BUFFER_SIZE: usize = 1024;
pub struct StreamingHandler<R: io::Read> {
buffer: [u8; BUFFER_SIZE],
buffer_leftover: usize,
status: StatusCode,
content: io::BufReader<R>,
mimetype: Mime,
safe_to_embed_on: Option<(String, u16)>,
}
impl<R: io::Read> StreamingHandler<R> {
pub fn new(content: R, status: StatusCode, mimetype: Mime, embeddable_on: Option<(String, u16)>) -> Self {
StreamingHandler {
buffer: [0; BUFFER_SIZE],
buffer_leftover: 0,
status: status,
content: io::BufReader::new(content),
mimetype: mimetype,
safe_to_embed_on: embeddable_on,
}
}
pub fn set_initial_content(&mut self, content: &str) {
assert_eq!(self.buffer_leftover, 0);
let bytes = content.as_bytes();
self.buffer_leftover = bytes.len();
self.buffer[0..self.buffer_leftover].copy_from_slice(bytes);
}
}
impl<R: io::Read> server::Handler<HttpStream> for StreamingHandler<R> {
fn on_request(&mut self, _request: server::Request<HttpStream>) -> Next {
Next::write()
}
fn on_request_readable(&mut self, _decoder: &mut Decoder<HttpStream>) -> Next {
Next::write()
}
fn on_response(&mut self, res: &mut server::Response) -> Next {
res.set_status(self.status);
res.headers_mut().set(header::ContentType(self.mimetype.clone()));
add_security_headers(&mut res.headers_mut(), self.safe_to_embed_on.clone());
Next::write()
}
fn on_response_writable(&mut self, encoder: &mut Encoder<HttpStream>) -> Next {
fn handle_error(e: io::Error) -> Next {
match e.kind() {
::std::io::ErrorKind::WouldBlock => Next::write(),
_ => Next::end(),
}
}
let write_pos = self.buffer_leftover;
match self.content.read(&mut self.buffer[write_pos..]) {
Err(e) => handle_error(e),
Ok(read) => match encoder.write(&self.buffer[..write_pos + read]) {
Err(e) => handle_error(e),
Ok(0) => Next::end(),
Ok(wrote) => {
self.buffer_leftover = write_pos + read - wrote;
if self.buffer_leftover > 0 {
for i in self.buffer_leftover..write_pos + read {
self.buffer.swap(i, i - self.buffer_leftover);
}
}
Next::write()
},
},
}
}
}