106 lines
3.2 KiB
Rust
106 lines
3.2 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! IPC RPC interface
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use std::io::{Read, Write};
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use std::marker::Sync;
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use semver::Version;
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/// Handshake for client and server to negotiate api/protocol version
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pub struct Handshake {
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pub protocol_version: Version,
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pub api_version: Version,
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}
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/// Allows to configure custom version and custom handshake response for
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/// ipc host
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pub trait IpcConfig {
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/// Current service api version
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/// Should be increased if any of the methods changes signature
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fn api_version() -> Version {
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Version::parse("1.0.0").unwrap()
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}
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/// Current ipc protocol version
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/// Should be increased only if signature of system methods changes
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fn protocol_version() -> Version {
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Version::parse("1.0.0").unwrap()
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}
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/// Default handshake requires exact versions match
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fn handshake(handshake: &Handshake) -> bool {
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handshake.protocol_version == Self::protocol_version() &&
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handshake.api_version == Self::api_version()
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}
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}
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/// Error in dispatching or invoking methods via IPC
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#[derive(Debug)]
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pub enum Error {
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UnkownSystemCall,
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ClientUnsupported,
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RemoteServiceUnsupported,
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HandshakeFailed,
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}
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/// Allows implementor to be attached to generic worker and dispatch rpc requests
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/// over IPC
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pub trait IpcInterface<T>: IpcConfig {
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/// reads the message from io, dispatches the call and returns serialized result
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fn dispatch<R>(&self, r: &mut R) -> Vec<u8> where R: Read;
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/// deserializes the payload from buffer, dispatches invoke and returns serialized result
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/// (for non-blocking io)
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fn dispatch_buf(&self, method_num: u16, buf: &[u8]) -> Vec<u8>;
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}
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/// serializes method invocation (method_num and parameters) to the stream specified by `w`
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pub fn invoke<W>(method_num: u16, params: &Option<Vec<u8>>, w: &mut W) where W: Write {
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// creating buffer to contain all message
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let buf_len = match *params { None => 2, Some(ref val) => val.len() + 2 };
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let mut buf = vec![0u8; buf_len];
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// writing method_num as u16
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buf[1] = (method_num & 255) as u8;
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buf[0] = (method_num >> 8) as u8;
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// serializing parameters only if provided with any
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if params.is_some() {
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buf[2..buf_len].clone_from_slice(params.as_ref().unwrap());
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}
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if w.write(&buf).unwrap() != buf_len
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{
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// if write was inconsistent
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panic!("failed to write to socket");
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}
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}
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/// IpcSocket, read/write generalization
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pub trait IpcSocket: Read + Write + Sync + Send {
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}
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/// Basically something that needs only socket to be spawned
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pub trait WithSocket<S: IpcSocket> {
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fn init(socket: S) -> Self;
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}
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impl IpcSocket for ::devtools::TestSocket {}
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impl IpcSocket for ::nanomsg::Socket {}
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