openethereum/ipc/nano/src/lib.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/>.
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//! IPC over nanomsg transport
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extern crate ethcore_ipc as ipc;
extern crate nanomsg;
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#[macro_use] extern crate log;
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pub use ipc::*;
use std::sync::*;
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use std::io::{Write, Read};
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use nanomsg::{Socket, Protocol, Error, Endpoint};
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pub struct Worker<S> where S: IpcInterface<S> {
service: Arc<S>,
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sockets: Vec<(Socket, Endpoint)>,
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method_buf: [u8;2],
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}
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#[derive(Debug)]
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pub enum SocketError {
DuplexLink
}
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impl<S> Worker<S> where S: IpcInterface<S> {
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pub fn new(service: Arc<S>) -> Worker<S> {
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Worker::<S> {
service: service.clone(),
sockets: Vec::new(),
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method_buf: [0,0]
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}
}
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pub fn poll(&mut self) {
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for item in self.sockets.iter_mut() {
let socket = &mut item.0;
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// non-blocking read only ok if there is something to read from socket
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match socket.nb_read(&mut self.method_buf) {
Ok(method_sign_len) => {
if method_sign_len == 2 {
let result = self.service.dispatch_buf(
self.method_buf[1] as u16 * 256 + self.method_buf[0] as u16,
socket);
if let Err(e) = socket.write(&result) {
warn!(target: "ipc", "Failed to write response: {:?}", e);
}
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}
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else {
warn!(target: "ipc", "Failed to read method signature from socket: unexpected message length({})", method_sign_len);
}
},
Err(Error::TryAgain) => {
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},
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Err(x) => {
warn!(target: "ipc", "Error polling connection {:?}", x);
panic!();
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}
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}
}
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}
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pub fn add_duplex(&mut self, addr: &str) -> Result<(), SocketError> {
let mut socket = try!(Socket::new(Protocol::Pair).map_err(|e| {
warn!(target: "ipc", "Failed to create ipc socket: {:?}", e);
SocketError::DuplexLink
}));
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let endpoint = try!(socket.bind(addr).map_err(|e| {
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warn!(target: "ipc", "Failed to bind socket to address '{}': {:?}", addr, e);
SocketError::DuplexLink
}));
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self.sockets.push((socket, endpoint));
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Ok(())
}
}
#[cfg(test)]
mod tests {
use super::Worker;
use ipc::*;
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use std::io::{Read, Write};
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use std::sync::{Arc, RwLock};
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use nanomsg::{Socket, Protocol};
use std::thread;
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struct TestInvoke {
method_num: u16,
params: Vec<u8>,
}
struct DummyService {
methods_stack: RwLock<Vec<TestInvoke>>,
}
impl DummyService {
fn new() -> DummyService {
DummyService { methods_stack: RwLock::new(Vec::new()) }
}
}
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impl IpcInterface<DummyService> for DummyService {
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fn dispatch<R>(&self, _r: &mut R) -> Vec<u8> where R: Read {
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vec![]
}
fn dispatch_buf<R>(&self, method_num: u16, r: &mut R) -> Vec<u8> where R: Read {
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let mut buf = vec![0u8; 4096];
let size = r.read_to_end(&mut buf).unwrap();
self.methods_stack.write().unwrap().push(
TestInvoke {
method_num: method_num,
params: unsafe { Vec::from_raw_parts(buf.as_mut_ptr(), size, size) }
});
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vec![]
}
}
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fn dummy_write(addr: &str, buf: &[u8]) {
let mut socket = Socket::new(Protocol::Pair).unwrap();
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let endpoint = socket.connect(addr).unwrap();
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thread::sleep_ms(10);
socket.write_all(buf).unwrap();
}
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#[test]
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fn can_create_worker() {
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let worker = Worker::<DummyService>::new(Arc::new(DummyService::new()));
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assert_eq!(0, worker.sockets.len());
}
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#[test]
fn can_add_duplex_socket_to_worker() {
let mut worker = Worker::<DummyService>::new(Arc::new(DummyService::new()));
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worker.add_duplex("ipc:///tmp/parity-test10.ipc").unwrap();
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assert_eq!(1, worker.sockets.len());
}
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#[test]
fn worker_can_poll_empty() {
let service = Arc::new(DummyService::new());
let mut worker = Worker::<DummyService>::new(service.clone());
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worker.add_duplex("ipc:///tmp/parity-test20.ipc").unwrap();
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worker.poll();
assert_eq!(0, service.methods_stack.read().unwrap().len());
}
#[test]
fn worker_can_poll() {
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let url = "ipc:///tmp/parity-test30.ipc";
let mut worker = Worker::<DummyService>::new(Arc::new(DummyService::new()));
worker.add_duplex(url).unwrap();
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dummy_write(url, &vec![0, 0, 7, 7, 6, 6]);
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worker.poll();
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assert_eq!(1, worker.service.methods_stack.read().unwrap().len());
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}
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}