mirror of
https://github.com/servo/servo.git
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7bf2e19437
0) Advertise support for the network monitor in the initial protocol communication. 1) Only notify the developer tools server about the final request in an HTTP transaction. 2) Add timing information for connecting to the HTTP server and sending the HTTP request. 3) Reduce duplication between various networkEventUpdate structures by creating a helper function that merges two JSON structures together. This also corrects the JSON structure so the devtools client interprets the output correctly. 4) Calculate various header size fields correctly. 5) Remove unnecessary usize->u32 casts by making the appropriate fields usize. 6) Add header values to request and response header messages. 7) Support triggering page reloads via the devtools client.
99 lines
3.7 KiB
Rust
99 lines
3.7 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 serde::Serialize;
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use serde_json::{self, Value};
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use std::error::Error;
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use std::io::{Read, Write};
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use std::net::TcpStream;
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#[derive(Serialize)]
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pub struct ActorDescription {
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pub category: &'static str,
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pub typeName: &'static str,
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pub methods: Vec<Method>,
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}
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#[derive(Serialize)]
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pub struct Method {
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pub name: &'static str,
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pub request: Value,
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pub response: Value,
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}
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pub trait JsonPacketStream {
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fn write_json_packet<T: Serialize>(&mut self, obj: &T);
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fn write_merged_json_packet<T: Serialize, U: Serialize>(&mut self, base: &T, extra: &U);
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fn read_json_packet(&mut self) -> Result<Option<Value>, String>;
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}
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impl JsonPacketStream for TcpStream {
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fn write_json_packet<T: Serialize>(&mut self, obj: &T) {
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let s = serde_json::to_string(obj).unwrap();
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debug!("<- {}", s);
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write!(self, "{}:{}", s.len(), s).unwrap();
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}
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fn write_merged_json_packet<T: Serialize, U: Serialize>(&mut self, base: &T, extra: &U) {
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let mut obj = serde_json::to_value(base);
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let obj = obj.as_object_mut().unwrap();
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let extra = serde_json::to_value(extra);
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let extra = extra.as_object().unwrap();
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for (key, value) in extra {
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obj.insert(key.to_owned(), value.to_owned());
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}
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self.write_json_packet(obj);
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}
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fn read_json_packet(&mut self) -> Result<Option<Value>, String> {
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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 mut buf = [0];
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let byte = match self.read(&mut buf) {
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Ok(0) => return Ok(None), // EOF
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Ok(1) => buf[0],
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Ok(_) => unreachable!(),
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Err(e) => return Err(e.description().to_owned()),
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};
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match byte {
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b':' => {
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let packet_len_str = match String::from_utf8(buffer) {
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Ok(packet_len) => packet_len,
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Err(_) => return Err("nonvalid UTF8 in packet length".to_owned()),
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};
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let packet_len = match u64::from_str_radix(&packet_len_str, 10) {
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Ok(packet_len) => packet_len,
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Err(_) => return Err("packet length missing / not parsable".to_owned()),
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};
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let mut packet = String::new();
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self.take(packet_len).read_to_string(&mut packet).unwrap();
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debug!("{}", packet);
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return match serde_json::from_str(&packet) {
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Ok(json) => Ok(Some(json)),
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Err(err) => match err {
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serde_json::Error::Io(ioerr) => {
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return Err(ioerr.description().to_owned())
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},
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serde_json::Error::Syntax(_, l, c) => {
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return Err(format!("syntax at {}:{}", l, c))
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},
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serde_json::Error::FromUtf8(e) => {
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return Err(e.description().to_owned())
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},
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},
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};
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},
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c => buffer.push(c),
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}
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}
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}
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}
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