openethereum/ethcore/src/service.rs

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//! Creates and registers client and network services.
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use util::*;
use spec::Spec;
use error::*;
use std::env;
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
/// A block is ready
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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}
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) -> Result<ClientService, Error> {
let mut net_service = try!(NetworkService::start(net_config));
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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 mut dir = env::home_dir().unwrap();
dir.push(".parity");
dir.push(H64::from(spec.genesis_header().hash()).hex());
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let client = try!(Client::new(spec, &dir, net_service.io().channel()));
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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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})
}
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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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/// 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();
let service = ClientService::start(spec, NetworkConfiguration::new());
assert!(service.is_ok());
}
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}