openethereum/parity/hypervisor/mod.rs
2016-04-21 16:32:44 +02:00

167 lines
4.9 KiB
Rust

// 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/>.
//! Parity interprocess hypervisor module
// while not included in binary
#![allow(dead_code)]
#![cfg_attr(feature="dev", allow(used_underscore_binding))]
pub mod service;
/// Default value for hypervisor ipc listener
pub const HYPERVISOR_IPC_URL: &'static str = "ipc:///tmp/parity-internal-hyper-status.ipc";
use nanoipc;
use std::sync::{Arc,RwLock};
use hypervisor::service::*;
use std::process::{Command,Child};
use std::collections::HashMap;
type BinaryId = &'static str;
const BLOCKCHAIN_DB_BINARY: BinaryId = "blockchain";
pub struct Hypervisor {
ipc_addr: String,
service: Arc<HypervisorService>,
ipc_worker: RwLock<nanoipc::Worker<HypervisorService>>,
processes: RwLock<HashMap<BinaryId, Child>>,
}
impl Default for Hypervisor {
fn default() -> Self {
Hypervisor::new()
}
}
impl Hypervisor {
/// initializes the Hypervisor service with the open ipc socket for incoming clients
pub fn new() -> Hypervisor {
Hypervisor::with_url(HYPERVISOR_IPC_URL)
}
/// Starts on the specified address for ipc listener
fn with_url(addr: &str) -> Hypervisor{
Hypervisor::with_url_and_service(addr, HypervisorService::new())
}
/// Starts with the specified address for the ipc listener and
/// the specified list of modules in form of created service
fn with_url_and_service(addr: &str, service: Arc<HypervisorService>) -> Hypervisor {
let worker = nanoipc::Worker::new(&service);
Hypervisor{
ipc_addr: addr.to_owned(),
service: service,
ipc_worker: RwLock::new(worker),
processes: RwLock::new(HashMap::new()),
}
}
/// Since one binary can host multiple modules
/// we match binaries
fn match_module(module_id: &IpcModuleId) -> Option<BinaryId> {
match *module_id {
BLOCKCHAIN_MODULE_ID => Some(BLOCKCHAIN_DB_BINARY),
// none means the module is inside the main binary
_ => None
}
}
/// Creates IPC listener and starts all binaries
fn start(&self) {
let mut worker = self.ipc_worker.write().unwrap();
worker.add_reqrep(&self.ipc_addr).unwrap_or_else(|e| panic!("Hypervisor ipc worker can not start - critical! ({:?})", e));
for module_id in self.service.module_ids() {
self.start_module(module_id);
}
}
/// Start binary for the specified module
/// Does nothing when it is already started on module is inside the
/// main binary
fn start_module(&self, module_id: IpcModuleId) {
Self::match_module(&module_id).map(|binary_id| {
let mut processes = self.processes.write().unwrap();
{
if processes.get(binary_id).is_some() {
// already started for another module
return;
}
}
let child = Command::new(binary_id).spawn().unwrap_or_else(
|e| panic!("Hypervisor cannot start binary: {}", e));
processes.insert(binary_id, child);
});
}
/// Reports if all modules are checked in
pub fn modules_ready(&self) -> bool {
self.service.unchecked_count() == 0
}
/// Waits for every required module to check in
pub fn wait_for_startup(&self) {
let mut worker = self.ipc_worker.write().unwrap();
while !self.modules_ready() {
worker.poll()
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::sync::atomic::{AtomicBool,Ordering};
use std::sync::Arc;
use super::service::*;
use nanoipc;
#[test]
fn can_init() {
let url = "ipc:///tmp/test-parity-hypervisor-10.ipc";
let test_module_id = 8080u64;
let hypervisor = Hypervisor::with_url_and_service(url, HypervisorService::with_modules(vec![test_module_id]));
assert_eq!(false, hypervisor.modules_ready());
}
#[test]
fn can_wait_for_startup() {
let url = "ipc:///tmp/test-parity-hypervisor-20.ipc";
let test_module_id = 8080u64;
let hypervisor_ready = Arc::new(AtomicBool::new(false));
let hypervisor_ready_local = hypervisor_ready.clone();
::std::thread::spawn(move || {
while !hypervisor_ready.load(Ordering::Relaxed) { }
let client = nanoipc::init_client::<HypervisorServiceClient<_>>(url).unwrap();
client.handshake().unwrap();
client.module_ready(test_module_id);
});
let hypervisor = Hypervisor::with_url_and_service(url, HypervisorService::with_modules(vec![test_module_id]));
hypervisor.start();
hypervisor_ready_local.store(true, Ordering::Relaxed);
hypervisor.wait_for_startup();
assert_eq!(true, hypervisor.modules_ready());
}
}