openethereum/util/network-devp2p/src/service.rs

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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.
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// Parity Ethereum is free software: you can redistribute it and/or modify
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// 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 Ethereum is distributed in the hope that it will be useful,
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// 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 Ethereum. If not, see <http://www.gnu.org/licenses/>.
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use std::net::SocketAddr;
use std::ops::RangeInclusive;
use std::sync::Arc;
use ansi_term::Colour;
use parking_lot::RwLock;
use host::Host;
use io::*;
use network::{Error, NetworkConfiguration, NetworkProtocolHandler, NonReservedPeerMode};
use network::{NetworkContext, NetworkIoMessage, PeerId, ProtocolId};
use network::ConnectionFilter;
struct HostHandler {
public_url: RwLock<Option<String>>
}
impl IoHandler<NetworkIoMessage> for HostHandler {
fn message(&self, _io: &IoContext<NetworkIoMessage>, message: &NetworkIoMessage) {
if let NetworkIoMessage::NetworkStarted(ref public_url) = *message {
let mut url = self.public_url.write();
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if url.as_ref().map_or(true, |uref| uref != public_url) {
info!(target: "network", "Public node URL: {}", Colour::White.bold().paint(AsRef::<str>::as_ref(public_url)));
}
*url = Some(public_url.to_owned());
}
}
}
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/// IO Service with networking
/// `Message` defines a notification data type.
pub struct NetworkService {
io_service: IoService<NetworkIoMessage>,
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host_info: String,
host: RwLock<Option<Arc<Host>>>,
host_handler: Arc<HostHandler>,
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config: NetworkConfiguration,
filter: Option<Arc<dyn ConnectionFilter>>,
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}
impl NetworkService {
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/// Starts IO event loop
pub fn new(config: NetworkConfiguration, filter: Option<Arc<dyn ConnectionFilter>>) -> Result<NetworkService, Error> {
let host_handler = Arc::new(HostHandler { public_url: RwLock::new(None) });
let io_service = IoService::<NetworkIoMessage>::start()?;
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Ok(NetworkService {
io_service,
host_info: config.client_version.clone(),
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host: RwLock::new(None),
config,
host_handler,
filter,
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})
}
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/// Register a new protocol handler with the event loop.
pub fn register_protocol(
&self,
handler: Arc<dyn NetworkProtocolHandler + Send + Sync>,
protocol: ProtocolId,
// version id + packet count
versions: &[(u8, u8)]
) -> Result<(), Error> {
self.io_service.send_message(NetworkIoMessage::AddHandler {
handler,
protocol,
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versions: versions.to_vec(),
})?;
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Ok(())
}
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/// Returns host identifier string as advertised to other peers
pub fn host_info(&self) -> String {
self.host_info.clone()
}
/// Returns underlying io service.
pub fn io(&self) -> &IoService<NetworkIoMessage> {
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&self.io_service
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}
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/// Returns the number of peers allowed.
pub fn num_peers_range(&self) -> RangeInclusive<u32> {
self.config.min_peers..=self.config.max_peers
}
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/// Returns external url if available.
pub fn external_url(&self) -> Option<String> {
let host = self.host.read();
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host.as_ref().and_then(|h| h.external_url())
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}
/// Returns external url if available.
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pub fn local_url(&self) -> Option<String> {
let host = self.host.read();
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host.as_ref().map(|h| h.local_url())
}
/// Start network IO.
///
/// In case of error, also returns the listening address for better error reporting.
pub fn start(&self) -> Result<(), (Error, Option<SocketAddr>)> {
let mut host = self.host.write();
let listen_addr = self.config.listen_address;
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if host.is_none() {
let h = Arc::new(Host::new(self.config.clone(), self.filter.clone())
.map_err(|err| (err, listen_addr))?);
self.io_service.register_handler(h.clone())
.map_err(|err| (err.into(), listen_addr))?;
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*host = Some(h);
}
if self.host_handler.public_url.read().is_none() {
self.io_service.register_handler(self.host_handler.clone())
.map_err(|err| (err.into(), listen_addr))?;
}
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Ok(())
}
/// Stop network IO.
pub fn stop(&self) {
let mut host = self.host.write();
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if let Some(ref host) = *host {
let io = IoContext::new(self.io_service.channel(), 0); //TODO: take token id from host
host.stop(&io);
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}
*host = None;
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}
/// Get a list of all connected peers by id.
pub fn connected_peers(&self) -> Vec<PeerId> {
self.host.read().as_ref().map(|h| h.connected_peers()).unwrap_or_else(Vec::new)
}
/// Try to add a reserved peer.
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pub fn add_reserved_peer(&self, peer: &str) -> Result<(), Error> {
let host = self.host.read();
if let Some(ref host) = *host {
host.add_reserved_node(peer)
} else {
Ok(())
}
}
/// Try to remove a reserved peer.
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pub fn remove_reserved_peer(&self, peer: &str) -> Result<(), Error> {
let host = self.host.read();
if let Some(ref host) = *host {
host.remove_reserved_node(peer)
} else {
Ok(())
}
}
/// Set the non-reserved peer mode.
pub fn set_non_reserved_mode(&self, mode: NonReservedPeerMode) {
let host = self.host.read();
if let Some(ref host) = *host {
let io_ctxt = IoContext::new(self.io_service.channel(), 0);
host.set_non_reserved_mode(mode, &io_ctxt);
}
}
/// Executes action in the network context
pub fn with_context<F>(&self, protocol: ProtocolId, action: F) where F: FnOnce(&dyn NetworkContext) {
let io = IoContext::new(self.io_service.channel(), 0);
let host = self.host.read();
if let Some(ref host) = host.as_ref() {
host.with_context(protocol, &io, action);
};
}
/// Evaluates function in the network context
pub fn with_context_eval<F, T>(&self, protocol: ProtocolId, action: F) -> Option<T> where F: FnOnce(&dyn NetworkContext) -> T {
let io = IoContext::new(self.io_service.channel(), 0);
let host = self.host.read();
host.as_ref().map(|ref host| host.with_context_eval(protocol, &io, action))
}
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}