107 lines
3.2 KiB
Rust
107 lines
3.2 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! IPC RPC interface
|
|
|
|
use std::io::{Read, Write};
|
|
use std::marker::Sync;
|
|
use semver::Version;
|
|
|
|
#[derive(Debug, PartialEq, Eq, Clone)]
|
|
/// Handshake for client and server to negotiate api/protocol version
|
|
pub struct Handshake {
|
|
pub protocol_version: Version,
|
|
pub api_version: Version,
|
|
}
|
|
|
|
/// Allows to configure custom version and custom handshake response for
|
|
/// ipc host
|
|
pub trait IpcConfig {
|
|
/// Current service api version
|
|
/// Should be increased if any of the methods changes signature
|
|
fn api_version() -> Version {
|
|
Version::parse("1.0.0").unwrap()
|
|
}
|
|
|
|
/// Current ipc protocol version
|
|
/// Should be increased only if signature of system methods changes
|
|
fn protocol_version() -> Version {
|
|
Version::parse("1.0.0").unwrap()
|
|
}
|
|
|
|
/// Default handshake requires exact versions match
|
|
fn handshake(handshake: &Handshake) -> bool {
|
|
handshake.protocol_version == Self::protocol_version() &&
|
|
handshake.api_version == Self::api_version()
|
|
}
|
|
}
|
|
|
|
/// Error in dispatching or invoking methods via IPC
|
|
#[derive(Debug)]
|
|
pub enum Error {
|
|
UnkownSystemCall,
|
|
ClientUnsupported,
|
|
RemoteServiceUnsupported,
|
|
HandshakeFailed,
|
|
}
|
|
|
|
/// Allows implementor to be attached to generic worker and dispatch rpc requests
|
|
/// over IPC
|
|
pub trait IpcInterface : IpcConfig {
|
|
/// reads the message from io, dispatches the call and returns serialized result
|
|
fn dispatch<R>(&self, r: &mut R) -> Vec<u8> where R: Read;
|
|
|
|
/// deserializes the payload from buffer, dispatches invoke and returns serialized result
|
|
/// (for non-blocking io)
|
|
fn dispatch_buf(&self, method_num: u16, buf: &[u8]) -> Vec<u8>;
|
|
}
|
|
|
|
/// serializes method invocation (method_num and parameters) to the stream specified by `w`
|
|
pub fn invoke<W>(method_num: u16, params: &Option<Vec<u8>>, w: &mut W) where W: Write {
|
|
// creating buffer to contain all message
|
|
let buf_len = match *params { None => 2, Some(ref val) => val.len() + 2 };
|
|
let mut buf = vec![0u8; buf_len];
|
|
|
|
// writing method_num as u16
|
|
buf[1] = (method_num & 255) as u8;
|
|
buf[0] = (method_num >> 8) as u8;
|
|
|
|
// serializing parameters only if provided with any
|
|
if params.is_some() {
|
|
buf[2..buf_len].clone_from_slice(params.as_ref().unwrap());
|
|
}
|
|
|
|
if w.write(&buf).unwrap() != buf_len
|
|
{
|
|
// if write was inconsistent
|
|
panic!("failed to write to socket");
|
|
}
|
|
}
|
|
|
|
/// IpcSocket, read/write generalization
|
|
pub trait IpcSocket: Read + Write + Sync + Send {
|
|
}
|
|
|
|
/// Basically something that needs only socket to be spawned
|
|
pub trait WithSocket<S: IpcSocket> {
|
|
fn init(socket: S) -> Self;
|
|
}
|
|
|
|
|
|
impl IpcSocket for ::devtools::TestSocket {}
|
|
|
|
impl IpcSocket for ::nanomsg::Socket {}
|