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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::old_io::{IoError, OtherIoError, EndOfFile, TcpStream, IoResult};
use std::num;
pub trait JsonPacketStream {
fn write_json_packet<'a, T: Encodable>(&mut self, obj: &T);
fn read_json_packet(&mut self) -> IoResult<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_str(&s.len().to_string()).unwrap();
self.write_u8(':' as u8).unwrap();
self.write_str(&s).unwrap();
}
fn read_json_packet<'a>(&mut self) -> IoResult<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 colon = ':' as u8;
match self.read_byte() {
Ok(c) if c != colon => buffer.push(c as u8),
Ok(_) => {
let packet_len_str = String::from_utf8(buffer).unwrap();
let packet_len = num::from_str_radix(&packet_len_str, 10).unwrap();
let packet_buf = self.read_exact(packet_len).unwrap();
let packet = String::from_utf8(packet_buf).unwrap();
println!("{}", packet);
return Ok(Json::from_str(&packet).unwrap())
},
Err(ref e) if e.kind == EndOfFile =>
return Err(IoError { kind: EndOfFile, desc: "EOF", detail: None }),
_ => return Err(IoError { kind: OtherIoError, desc: "connection error", detail: None })
}
}
}
}
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