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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Low-level wire protocol implementation. Currently only supports
//! [JSON packets]
//! (https://wiki.mozilla.org/Remote_Debugging_Protocol_Stream_Transport#JSON_Packets).
use rustc_serialize::{json, Encodable};
use rustc_serialize::json::Json;
use std::io::{self, Read, Write};
use std::net::TcpStream;
pub trait JsonPacketStream {
fn write_json_packet<'a, T: Encodable>(&mut self, obj: &T);
fn read_json_packet(&mut self) -> io::Result<Option<Json>>;
}
impl JsonPacketStream for TcpStream {
fn write_json_packet<'a, T: Encodable>(&mut self, obj: &T) {
let s = json::encode(obj).unwrap().replace("__type__", "type");
println!("<- {}", s);
self.write_all(s.len().to_string().as_bytes()).unwrap();
self.write_all(&[':' as u8]).unwrap();
self.write_all(s.as_bytes()).unwrap();
}
fn read_json_packet<'a>(&mut self) -> io::Result<Option<Json>> {
// https://wiki.mozilla.org/Remote_Debugging_Protocol_Stream_Transport
// In short, each JSON packet is [ascii length]:[JSON data of given length]
let mut buffer = vec!();
loop {
let mut buf = [0];
let byte = match try!(self.read(&mut buf)) {
0 => return Ok(None), // EOF
1 => buf[0],
_ => unreachable!(),
};
match byte {
b':' => {
let packet_len_str = String::from_utf8(buffer).unwrap();
let packet_len = u64::from_str_radix(&packet_len_str, 10).unwrap();
let mut packet = String::new();
self.take(packet_len).read_to_string(&mut packet).unwrap();
println!("{}", packet);
return Ok(Some(Json::from_str(&packet).unwrap()))
},
c => buffer.push(c),
}
}
}
}
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