95 lines
3.8 KiB
Rust
95 lines
3.8 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// 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
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// 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
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity Ethereum. If not, see <http://www.gnu.org/licenses/>.
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//! A service transactions contract checker.
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use std::collections::HashMap;
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use std::mem;
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use std::sync::Arc;
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use call_contract::{RegistryInfo, CallContract};
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use types::ids::BlockId;
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use types::transaction::SignedTransaction;
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use ethabi::FunctionOutputDecoder;
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use ethereum_types::Address;
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use parking_lot::RwLock;
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use_contract!(service_transaction, "res/contracts/service_transaction.json");
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const SERVICE_TRANSACTION_CONTRACT_REGISTRY_NAME: &'static str = "service_transaction_checker";
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/// Service transactions checker.
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#[derive(Default, Clone)]
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pub struct ServiceTransactionChecker {
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certified_addresses_cache: Arc<RwLock<HashMap<Address, bool>>>
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}
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impl ServiceTransactionChecker {
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/// Checks if given address in tx is whitelisted to send service transactions.
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pub fn check<C: CallContract + RegistryInfo>(&self, client: &C, tx: &SignedTransaction) -> Result<bool, String> {
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let sender = tx.sender();
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// Skip checking the contract if the transaction does not have zero gas price
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if !tx.gas_price.is_zero() {
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return Ok(false)
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}
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self.check_address(client, sender)
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}
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/// Checks if given address is whitelisted to send service transactions.
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pub fn check_address<C: CallContract + RegistryInfo>(&self, client: &C, sender: Address) -> Result<bool, String> {
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trace!(target: "txqueue", "Checking service transaction checker contract from {}", sender);
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if let Some(allowed) = self.certified_addresses_cache.try_read().as_ref().and_then(|c| c.get(&sender)) {
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return Ok(*allowed);
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}
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let contract_address = client.registry_address(SERVICE_TRANSACTION_CONTRACT_REGISTRY_NAME.to_owned(), BlockId::Latest)
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.ok_or_else(|| "contract is not configured")?;
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self.call_contract(client, contract_address, sender).and_then(|allowed| {
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if let Some(mut cache) = self.certified_addresses_cache.try_write() {
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cache.insert(sender, allowed);
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};
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Ok(allowed)
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})
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}
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/// Refresh certified addresses cache
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pub fn refresh_cache<C: CallContract + RegistryInfo>(&self, client: &C) -> Result<bool, String> {
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trace!(target: "txqueue", "Refreshing certified addresses cache");
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// replace the cache with an empty list,
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// since it's not recent it won't be used anyway.
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let cache = mem::replace(&mut *self.certified_addresses_cache.write(), HashMap::default());
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if let Some(contract_address) = client.registry_address(SERVICE_TRANSACTION_CONTRACT_REGISTRY_NAME.to_owned(), BlockId::Latest) {
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let addresses: Vec<_> = cache.keys().collect();
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let mut cache: HashMap<Address, bool> = HashMap::default();
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for address in addresses {
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let allowed = self.call_contract(client, contract_address, *address)?;
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cache.insert(*address, allowed);
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}
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mem::replace(&mut *self.certified_addresses_cache.write(), cache);
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Ok(true)
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} else {
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Ok(false)
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}
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}
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fn call_contract<C: CallContract + RegistryInfo>(&self, client: &C, contract_address: Address, sender: Address) -> Result<bool, String> {
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let (data, decoder) = service_transaction::functions::certified::call(sender);
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let value = client.call_contract(BlockId::Latest, contract_address, data)?;
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decoder.decode(&value).map_err(|e| e.to_string())
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}
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}
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