openethereum/ethcore/src/service.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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//! Creates and registers client and network services.
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use util::*;
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use util::panics::*;
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use spec::Spec;
use error::*;
use client::Client;
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/// Message type for external and internal events
#[derive(Clone)]
pub enum SyncMessage {
/// New block has been imported into the blockchain
NewChainBlock(Bytes), //TODO: use Cow
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/// A block is ready
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BlockVerified,
}
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/// IO Message type used for Network service
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pub type NetSyncMessage = NetworkIoMessage<SyncMessage>;
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/// Client service setup. Creates and registers client and network services with the IO subsystem.
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pub struct ClientService {
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net_service: NetworkService<SyncMessage>,
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client: Arc<Client>,
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panic_handler: Arc<PanicHandler>
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}
impl ClientService {
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/// Start the service in a separate thread.
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pub fn start(spec: Spec, net_config: NetworkConfiguration, db_path: &Path) -> Result<ClientService, Error> {
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let panic_handler = PanicHandler::new_in_arc();
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let mut net_service = try!(NetworkService::start(net_config));
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panic_handler.forward_from(&net_service);
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info!("Starting {}", net_service.host_info());
info!("Configured for {} using {} engine", spec.name, spec.engine_name);
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let client = try!(Client::new(spec, db_path, net_service.io().channel()));
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panic_handler.forward_from(client.deref());
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let client_io = Arc::new(ClientIoHandler {
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client: client.clone()
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});
try!(net_service.io().register_handler(client_io));
Ok(ClientService {
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net_service: net_service,
client: client,
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panic_handler: panic_handler,
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})
}
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/// Add a node to network
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pub fn add_node(&mut self, _enode: &str) {
unimplemented!();
}
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/// Get general IO interface
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pub fn io(&mut self) -> &mut IoService<NetSyncMessage> {
self.net_service.io()
}
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/// Get client interface
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pub fn client(&self) -> Arc<Client> {
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self.client.clone()
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}
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/// Get network service component
pub fn network(&mut self) -> &mut NetworkService<SyncMessage> {
&mut self.net_service
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}
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}
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impl MayPanic for ClientService {
fn on_panic<F>(&self, closure: F) where F: OnPanicListener {
self.panic_handler.on_panic(closure);
}
}
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/// IO interface for the Client handler
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struct ClientIoHandler {
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client: Arc<Client>
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}
const CLIENT_TICK_TIMER: TimerToken = 0;
const CLIENT_TICK_MS: u64 = 5000;
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impl IoHandler<NetSyncMessage> for ClientIoHandler {
fn initialize(&self, io: &IoContext<NetSyncMessage>) {
io.register_timer(CLIENT_TICK_TIMER, CLIENT_TICK_MS).expect("Error registering client timer");
}
fn timeout(&self, _io: &IoContext<NetSyncMessage>, timer: TimerToken) {
if timer == CLIENT_TICK_TIMER {
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self.client.tick();
}
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}
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#[allow(match_ref_pats)]
#[allow(single_match)]
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fn message(&self, io: &IoContext<NetSyncMessage>, net_message: &NetSyncMessage) {
if let &UserMessage(ref message) = net_message {
match message {
&SyncMessage::BlockVerified => {
self.client.import_verified_blocks(&io.channel());
},
_ => {}, // ignore other messages
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}
}
}
}
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#[cfg(test)]
mod tests {
use super::*;
use tests::helpers::*;
use util::network::*;
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#[test]
fn it_can_be_started() {
let spec = get_test_spec();
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let mut p = env::home_dir();
p.push(".parity");
let service = ClientService::start(spec, NetworkConfiguration::new(), &p);
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assert!(service.is_ok());
}
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}