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extern crate client_traits;
extern crate common_types;
extern crate vapabi;
extern crate vapcore;
extern crate vapcore_network as network;
extern crate vapcore_network_devp2p as devp2p;
extern crate vapory_types;
extern crate lru_cache;
extern crate parking_lot;
#[macro_use]
extern crate vapabi_contract;
#[cfg(test)]
extern crate vapcore_io as io;
#[cfg(test)]
extern crate tetsy_kvdb_memorydb;
#[cfg(test)]
extern crate tempdir;
#[cfg(test)]
extern crate spec;
#[macro_use]
extern crate log;
use std::collections::{HashMap, VecDeque};
use std::sync::Weak;
use common_types::{
ids::BlockId,
chain_notify::NewBlocks,
};
use client_traits::{BlockChainClient, ChainNotify};
use vapory_types::{H256, Address};
use vapabi::FunctionOutputDecoder;
use network::{ConnectionFilter, ConnectionDirection};
use devp2p::NodeId;
use devp2p::MAX_NODES_IN_TABLE;
use parking_lot::RwLock;
use_contract!(peer_set, "res/peer_set.json");
pub struct NodeFilter {
client: Weak<dyn BlockChainClient>,
contract_address: Address,
cache: RwLock<Cache>
}
struct Cache {
cache: HashMap<NodeId, bool>,
order: VecDeque<NodeId>
}
pub const CACHE_SIZE: usize = MAX_NODES_IN_TABLE + 1024;
impl NodeFilter {
pub fn new(client: Weak<dyn BlockChainClient>, contract_address: Address) -> NodeFilter {
NodeFilter {
client,
contract_address,
cache: RwLock::new(Cache{
cache: HashMap::with_capacity(CACHE_SIZE),
order: VecDeque::with_capacity(CACHE_SIZE)
})
}
}
}
impl ConnectionFilter for NodeFilter {
fn connection_allowed(&self, own_id: &NodeId, connecting_id: &NodeId, _direction: ConnectionDirection) -> bool {
let client = match self.client.upgrade() {
Some(client) => client,
None => return false,
};
if let Some(allowed) = self.cache.read().cache.get(connecting_id) {
return *allowed;
}
let address = self.contract_address;
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 (data, decoder) = peer_set::functions::connection_allowed::call(own_low, own_high, id_low, id_high);
let allowed = client.call_contract(BlockId::Latest, address, data)
.and_then(|value| decoder.decode(&value).map_err(|e| e.to_string()))
.unwrap_or_else(|e| {
debug!("Error callling peer set contract: {:?}", e);
false
});
let mut cache = self.cache.write();
if cache.cache.len() == CACHE_SIZE {
let popped = cache.order.pop_front().expect("the cache is full so there's at least one item we can pop; qed");
cache.cache.remove(&popped);
};
if cache.cache.insert(*connecting_id, allowed).is_none() {
cache.order.push_back(*connecting_id);
}
allowed
}
}
impl ChainNotify for NodeFilter {
fn new_blocks(&self, _new_blocks: NewBlocks) {
let mut cache = self.cache.write();
cache.cache.clear();
cache.order.clear();
}
}
#[cfg(test)]
mod test {
use std::sync::{Arc, Weak};
use client_traits::BlockChainClient;
use spec::Spec;
use vapcore::client::{Client, ClientConfig};
use vapcore::miner::Miner;
use vapcore::test_helpers;
use network::{ConnectionDirection, ConnectionFilter, NodeId};
use io::IoChannel;
use super::NodeFilter;
use tempdir::TempDir;
use vapory_types::Address;
use std::str::FromStr;
#[test]
fn node_filter() {
let contract_addr = Address::from_str("0000000000000000000000000000000000000005").unwrap();
let data = include_bytes!("../res/node_filter.json");
let tempdir = TempDir::new("").unwrap();
let spec = Spec::load(&tempdir.path(), &data[..]).unwrap();
let client_db = test_helpers::new_db();
let client = Client::new(
ClientConfig::default(),
&spec,
client_db,
Arc::new(Miner::new_for_tests(&spec, None)),
IoChannel::disconnected(),
).unwrap();
let filter = NodeFilter::new(Arc::downgrade(&client) as Weak<dyn 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));
assert!(filter.connection_allowed(&self2, &node1, ConnectionDirection::Inbound));
assert!(filter.connection_allowed(&self2, &node2, ConnectionDirection::Inbound));
}
}