f59ae9c05a
The Rust style guide suggests 100, but we have too many violations in the tree already. This check can be tightened over time. Source-Repo: https://github.com/servo/servo Source-Revision: ee94b3e8bf659c847bda967700272f8f98fdb0cc
51 lines
2.2 KiB
Rust
51 lines
2.2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Low-level wire protocol implementation. Currently only supports
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//! [JSON packets]
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//! (https://wiki.mozilla.org/Remote_Debugging_Protocol_Stream_Transport#JSON_Packets).
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use serialize::{json, Encodable};
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use serialize::json::Json;
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use std::io::{IoError, OtherIoError, EndOfFile, TcpStream, IoResult};
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use std::num;
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pub trait JsonPacketStream {
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fn write_json_packet<'a, T: Encodable<json::Encoder<'a>,IoError>>(&mut self, obj: &T);
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fn read_json_packet(&mut self) -> IoResult<Json>;
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}
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impl JsonPacketStream for TcpStream {
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fn write_json_packet<'a, T: Encodable<json::Encoder<'a>,IoError>>(&mut self, obj: &T) {
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let s = json::encode(obj).replace("__type__", "type");
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println!("<- {}", s);
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self.write_str(s.len().to_string().as_slice()).unwrap();
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self.write_u8(':' as u8).unwrap();
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self.write_str(s.as_slice()).unwrap();
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}
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fn read_json_packet<'a>(&mut self) -> IoResult<Json> {
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// https://wiki.mozilla.org/Remote_Debugging_Protocol_Stream_Transport
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// In short, each JSON packet is [ascii length]:[JSON data of given length]
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let mut buffer = vec!();
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loop {
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let colon = ':' as u8;
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match self.read_byte() {
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Ok(c) if c != colon => buffer.push(c as u8),
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Ok(_) => {
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let packet_len_str = String::from_utf8(buffer).unwrap();
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let packet_len = num::from_str_radix(packet_len_str.as_slice(), 10).unwrap();
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let packet_buf = self.read_exact(packet_len).unwrap();
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let packet = String::from_utf8(packet_buf).unwrap();
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println!("{}", packet);
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return Ok(json::from_str(packet.as_slice()).unwrap())
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},
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Err(ref e) if e.kind == EndOfFile =>
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return Err(IoError { kind: EndOfFile, desc: "EOF", detail: None }),
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_ => return Err(IoError { kind: OtherIoError, desc: "connection error", detail: None })
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}
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}
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}
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}
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