openethereum/sync/src/sync_io.rs

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// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
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// 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/>.
use std::collections::HashMap;
use network::{NetworkContext, PeerId, PacketId, NetworkError, SessionInfo, ProtocolId};
use util::Bytes;
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use ethcore::client::BlockChainClient;
use ethcore::header::BlockNumber;
use ethcore::snapshot::SnapshotService;
use parking_lot::RwLock;
/// IO interface for the syncing handler.
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/// Provides peer connection management and an interface to the blockchain client.
// TODO: ratings
pub trait SyncIo {
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/// Disable a peer
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fn disable_peer(&mut self, peer_id: PeerId);
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/// Disconnect peer
fn disconnect_peer(&mut self, peer_id: PeerId);
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/// Respond to current request with a packet. Can be called from an IO handler for incoming packet.
fn respond(&mut self, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError>;
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/// Send a packet to a peer.
fn send(&mut self, peer_id: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError>;
/// Send a packet to a peer using specified protocol.
fn send_protocol(&mut self, protocol: ProtocolId, peer_id: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError>;
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/// Get the blockchain
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fn chain(&self) -> &BlockChainClient;
/// Get the snapshot service.
fn snapshot_service(&self) -> &SnapshotService;
/// Returns peer identifier string
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fn peer_info(&self, peer_id: PeerId) -> String {
peer_id.to_string()
}
/// Returns information on p2p session
fn peer_session_info(&self, peer_id: PeerId) -> Option<SessionInfo>;
/// Maximum mutually supported ETH protocol version
fn eth_protocol_version(&self, peer_id: PeerId) -> u8;
/// Maximum mutually supported version of a gien protocol.
fn protocol_version(&self, protocol: &ProtocolId, peer_id: PeerId) -> u8;
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/// Returns if the chain block queue empty
fn is_chain_queue_empty(&self) -> bool {
self.chain().queue_info().is_empty()
}
/// Check if the session is expired
fn is_expired(&self) -> bool;
/// Return sync overlay
fn chain_overlay(&self) -> &RwLock<HashMap<BlockNumber, Bytes>>;
}
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/// Wraps `NetworkContext` and the blockchain client
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pub struct NetSyncIo<'s, 'h> where 'h: 's {
network: &'s NetworkContext<'h>,
chain: &'s BlockChainClient,
snapshot_service: &'s SnapshotService,
chain_overlay: &'s RwLock<HashMap<BlockNumber, Bytes>>,
}
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impl<'s, 'h> NetSyncIo<'s, 'h> {
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/// Creates a new instance from the `NetworkContext` and the blockchain client reference.
pub fn new(network: &'s NetworkContext<'h>,
chain: &'s BlockChainClient,
snapshot_service: &'s SnapshotService,
chain_overlay: &'s RwLock<HashMap<BlockNumber, Bytes>>) -> NetSyncIo<'s, 'h> {
NetSyncIo {
network: network,
chain: chain,
snapshot_service: snapshot_service,
chain_overlay: chain_overlay,
}
}
}
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impl<'s, 'h> SyncIo for NetSyncIo<'s, 'h> {
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fn disable_peer(&mut self, peer_id: PeerId) {
self.network.disable_peer(peer_id);
}
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fn disconnect_peer(&mut self, peer_id: PeerId) {
self.network.disconnect_peer(peer_id);
}
fn respond(&mut self, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError>{
self.network.respond(packet_id, data)
}
fn send(&mut self, peer_id: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError>{
self.network.send(peer_id, packet_id, data)
}
fn send_protocol(&mut self, protocol: ProtocolId, peer_id: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError>{
self.network.send_protocol(protocol, peer_id, packet_id, data)
}
fn chain(&self) -> &BlockChainClient {
self.chain
}
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fn chain_overlay(&self) -> &RwLock<HashMap<BlockNumber, Bytes>> {
self.chain_overlay
}
fn snapshot_service(&self) -> &SnapshotService {
self.snapshot_service
}
fn peer_session_info(&self, peer_id: PeerId) -> Option<SessionInfo> {
self.network.session_info(peer_id)
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}
fn is_expired(&self) -> bool {
self.network.is_expired()
}
fn eth_protocol_version(&self, peer_id: PeerId) -> u8 {
self.network.protocol_version(self.network.subprotocol_name(), peer_id).unwrap_or(0)
}
fn protocol_version(&self, protocol: &ProtocolId, peer_id: PeerId) -> u8 {
self.network.protocol_version(*protocol, peer_id).unwrap_or(0)
}
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fn peer_info(&self, peer_id: PeerId) -> String {
self.network.peer_client_version(peer_id)
}
}