openethereum/ipc/rpc/src/interface.rs

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// Copyright 2015, 2016 Ethcore (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
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use std::io::{Read, Write};
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,
pub api_version: Version,
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}
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/// Allows to configure custom version and custom handshake response for
/// ipc host
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pub trait IpcConfig {
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/// Current service api version
/// Should be increased if any of the methods changes signature
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fn api_version() -> Version {
Version::parse("1.0.0").unwrap()
}
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/// Current ipc protocol version
/// Should be increased only if signature of system methods changes
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fn protocol_version() -> Version {
Version::parse("1.0.0").unwrap()
}
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/// Default handshake requires exact versions match
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fn handshake(handshake: &Handshake) -> bool {
handshake.protocol_version == Self::protocol_version() &&
handshake.api_version == Self::api_version()
}
}
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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 {
UnkownSystemCall,
ClientUnsupported,
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RemoteServiceUnsupported,
HandshakeFailed,
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}
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/// Allows implementor to be attached to generic worker and dispatch rpc requests
/// 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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/// 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];
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// writing method_num as u16
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buf[1] = (method_num & 255) as u8;
buf[0] = (method_num >> 8) as u8;
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// serializing parameters only if provided with any
if params.is_some() {
buf[2..buf_len].clone_from_slice(params.as_ref().unwrap());
}
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if w.write(&buf).unwrap() != buf_len
{
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// if write was inconsistent
panic!("failed to write to socket");
}
}
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/// IpcSocket, read/write generalization
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pub trait IpcSocket: Read + Write + Sync {
}
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/// Basically something that needs only socket to be spawned
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pub trait WithSocket<S: IpcSocket> {
fn init(socket: S) -> Self;
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}
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impl IpcSocket for ::devtools::TestSocket {}
impl IpcSocket for ::nanomsg::Socket {}