      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101

    // Copyright 2015-2017 Parity Technologies (UK) Ltd.
    // This file is part of Parity.

    // Parity is free software: you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation, either version 3 of the License, or
    // (at your option) any later version.

    // Parity is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    // GNU General Public License for more details.

    // You should have received a copy of the GNU General Public License
    // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

    //! Content Stream Response

    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()
    				},
    			},
    		}
    	}
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)