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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::Json;
use rustc_serialize::json::ParserError::{IoError, SyntaxError};
use rustc_serialize::{Encodable, json};
use std::error::Error;
use std::io::{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) -> Result<Option<Json>, String>;
}
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);
write!(self, "{}:{}", s.len(), s).unwrap();
}
fn read_json_packet<'a>(&mut self) -> Result<Option<Json>, String> {
// 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 self.read(&mut buf) {
Ok(0) => return Ok(None), // EOF
Ok(1) => buf[0],
Ok(_) => unreachable!(),
Err(e) => return Err(e.description().to_owned()),
};
match byte {
b':' => {
let packet_len_str = match String::from_utf8(buffer) {
Ok(packet_len) => packet_len,
Err(_) => return Err("nonvalid UTF8 in packet length".to_owned()),
};
let packet_len = match u64::from_str_radix(&packet_len_str, 10) {
Ok(packet_len) => packet_len,
Err(_) => return Err("packet length missing / not parsable".to_owned()),
};
let mut packet = String::new();
self.take(packet_len).read_to_string(&mut packet).unwrap();
println!("{}", packet);
return match Json::from_str(&packet) {
Ok(json) => Ok(Some(json)),
Err(err) => match err {
IoError(ioerr) => return Err(ioerr.description().to_owned()),
SyntaxError(_, l, c) => return Err(format!("syntax at {}:{}", l, c)),
},
};
},
c => buffer.push(c),
}
}
}
}
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