102 lines
3.0 KiB
Rust
102 lines
3.0 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Content Stream Response
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use std::io::{self, Read};
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use hyper::{header, server, Decoder, Encoder, Next};
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use hyper::net::HttpStream;
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use hyper::mime::Mime;
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use hyper::status::StatusCode;
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use handlers::add_security_headers;
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const BUFFER_SIZE: usize = 1024;
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pub struct StreamingHandler<R: io::Read> {
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buffer: [u8; BUFFER_SIZE],
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buffer_leftover: usize,
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status: StatusCode,
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content: io::BufReader<R>,
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mimetype: Mime,
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safe_to_embed_on: Option<(String, u16)>,
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}
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impl<R: io::Read> StreamingHandler<R> {
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pub fn new(content: R, status: StatusCode, mimetype: Mime, embeddable_on: Option<(String, u16)>) -> Self {
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StreamingHandler {
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buffer: [0; BUFFER_SIZE],
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buffer_leftover: 0,
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status: status,
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content: io::BufReader::new(content),
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mimetype: mimetype,
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safe_to_embed_on: embeddable_on,
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}
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}
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pub fn set_initial_content(&mut self, content: &str) {
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assert_eq!(self.buffer_leftover, 0);
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let bytes = content.as_bytes();
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self.buffer_leftover = bytes.len();
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self.buffer[0..self.buffer_leftover].copy_from_slice(bytes);
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}
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}
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impl<R: io::Read> server::Handler<HttpStream> for StreamingHandler<R> {
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fn on_request(&mut self, _request: server::Request<HttpStream>) -> Next {
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Next::write()
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}
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fn on_request_readable(&mut self, _decoder: &mut Decoder<HttpStream>) -> Next {
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Next::write()
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}
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fn on_response(&mut self, res: &mut server::Response) -> Next {
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res.set_status(self.status);
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res.headers_mut().set(header::ContentType(self.mimetype.clone()));
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add_security_headers(&mut res.headers_mut(), self.safe_to_embed_on.clone());
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Next::write()
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}
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fn on_response_writable(&mut self, encoder: &mut Encoder<HttpStream>) -> Next {
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fn handle_error(e: io::Error) -> Next {
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match e.kind() {
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::std::io::ErrorKind::WouldBlock => Next::write(),
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_ => Next::end(),
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}
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}
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let write_pos = self.buffer_leftover;
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match self.content.read(&mut self.buffer[write_pos..]) {
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Err(e) => handle_error(e),
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Ok(read) => match encoder.write(&self.buffer[..write_pos + read]) {
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Err(e) => handle_error(e),
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Ok(0) => Next::end(),
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Ok(wrote) => {
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self.buffer_leftover = write_pos + read - wrote;
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if self.buffer_leftover > 0 {
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for i in self.buffer_leftover..write_pos + read {
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self.buffer.swap(i, i - self.buffer_leftover);
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}
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}
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Next::write()
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},
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},
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}
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}
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}
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