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// Copyright 2015-2017 Parity Technologies (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/>.
//! Smart contract based node filter.
extern crate ethcore;
extern crate ethcore_util as util;
extern crate ethcore_bytes as bytes;
extern crate ethcore_network as network;
extern crate native_contracts;
extern crate futures;
#[cfg(test)] extern crate ethcore_io as io;
#[macro_use] extern crate log;
use std::sync::Weak;
use std::collections::HashMap;
use native_contracts::PeerSet as Contract;
use network::{NodeId, ConnectionFilter, ConnectionDirection};
use ethcore::client::{BlockChainClient, BlockId, ChainNotify};
use util::Address;
use bytes::Bytes;
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use futures::Future;
const MAX_CACHE_SIZE: usize = 4096;
/// Connection filter that uses a contract to manage permissions.
pub struct NodeFilter {
contract: Mutex<Option<Contract>>,
client: Weak<BlockChainClient>,
contract_address: Address,
permission_cache: Mutex<HashMap<NodeId, bool>>,
}
impl NodeFilter {
/// Create a new instance. Accepts a contract address.
pub fn new(client: Weak<BlockChainClient>, contract_address: Address) -> NodeFilter {
NodeFilter {
contract: Mutex::new(None),
client: client,
contract_address: contract_address,
permission_cache: Mutex::new(HashMap::new()),
}
}
/// Clear cached permissions.
pub fn clear_cache(&self) {
self.permission_cache.lock().clear();
}
}
impl ConnectionFilter for NodeFilter {
fn connection_allowed(&self, own_id: &NodeId, connecting_id: &NodeId, _direction: ConnectionDirection) -> bool {
let mut cache = self.permission_cache.lock();
if let Some(res) = cache.get(connecting_id) {
return *res;
}
let mut contract = self.contract.lock();
if contract.is_none() {
*contract = Some(Contract::new(self.contract_address));
}
let allowed = match (self.client.upgrade(), &*contract) {
(Some(ref client), &Some(ref contract)) => {
let own_low = H256::from_slice(&own_id[0..32]);
let own_high = H256::from_slice(&own_id[32..64]);
let id_low = H256::from_slice(&connecting_id[0..32]);
let id_high = H256::from_slice(&connecting_id[32..64]);
let allowed = contract.connection_allowed(
|addr, data| futures::done(client.call_contract(BlockId::Latest, addr, data)),
own_low,
own_high,
id_low,
id_high,
).wait().unwrap_or_else(|e| {
debug!("Error callling peer set contract: {:?}", e);
false
});
allowed
}
_ => false,
};
if cache.len() < MAX_CACHE_SIZE {
cache.insert(*connecting_id, allowed);
}
allowed
}
}
impl ChainNotify for NodeFilter {
fn new_blocks(&self, imported: Vec<H256>, _invalid: Vec<H256>, _enacted: Vec<H256>, _retracted: Vec<H256>, _sealed: Vec<H256>, _proposed: Vec<Bytes>, _duration: u64) {
if !imported.is_empty() {
self.clear_cache();
}
}
}
#[cfg(test)]
mod test {
use std::sync::{Arc, Weak};
use std::str::FromStr;
use ethcore::spec::Spec;
use ethcore::client::{BlockChainClient, Client, ClientConfig};
use ethcore::miner::Miner;
use util::{Address};
use network::{ConnectionDirection, ConnectionFilter, NodeId};
use io::IoChannel;
use super::NodeFilter;
/// Contract code: https://gist.github.com/arkpar/467dbcc73cbb85b0997a7a10ffa0695f
#[test]
fn node_filter() {
let contract_addr = Address::from_str("0000000000000000000000000000000000000005").unwrap();
let data = include_bytes!("../res/node_filter.json");
let spec = Spec::load(::std::env::temp_dir(), &data[..]).unwrap();
let client_db = Arc::new(::util::kvdb::in_memory(::ethcore::db::NUM_COLUMNS.unwrap_or(0)));
let client = Client::new(
ClientConfig::default(),
&spec,
client_db,
Arc::new(Miner::with_spec(&spec)),
IoChannel::disconnected(),
).unwrap();
let filter = NodeFilter::new(Arc::downgrade(&client) as Weak<BlockChainClient>, contract_addr);
let self1 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002").unwrap();
let self2 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003").unwrap();
let node1 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012").unwrap();
let node2 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000210000000000000000000000000000000000000000000000000000000000000022").unwrap();
let nodex = NodeId::from_str("77000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
assert!(filter.connection_allowed(&self1, &node1, ConnectionDirection::Inbound));
assert!(filter.connection_allowed(&self1, &nodex, ConnectionDirection::Inbound));
filter.clear_cache();
assert!(filter.connection_allowed(&self2, &node1, ConnectionDirection::Inbound));
assert!(filter.connection_allowed(&self2, &node2, ConnectionDirection::Inbound));
assert!(!filter.connection_allowed(&self2, &nodex, ConnectionDirection::Inbound));
}
}