52 lines
2.0 KiB
Rust
52 lines
2.0 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity 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 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. If not, see <http://www.gnu.org/licenses/>.
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//! A service transactions contract checker.
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use client::{RegistryInfo, CallContract, BlockId};
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use types::transaction::SignedTransaction;
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use ethabi::FunctionOutputDecoder;
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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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impl ServiceTransactionChecker {
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/// Checks if given address 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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let hash = tx.hash();
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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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let 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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trace!(target: "txqueue", "[{:?}] Checking service transaction checker contract from {}", hash, sender);
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let (data, decoder) = service_transaction::functions::certified::call(sender);
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let value = client.call_contract(BlockId::Latest, 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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