58 lines
2.1 KiB
Rust
58 lines
2.1 KiB
Rust
// Copyright 2017 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 ethereum_types::Address;
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use transaction::SignedTransaction;
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use types::ids::BlockId;
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use_contract!(service_transaction, "ServiceTransaction", "res/service_transaction.json");
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const SERVICE_TRANSACTION_CONTRACT_REGISTRY_NAME: &'static str = "service_transaction_checker";
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/// A contract calling interface.
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pub trait ContractCaller {
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/// Returns address of contract from the registry, given it's name
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fn registry_address(&self, name: &str) -> Option<Address>;
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/// Executes a contract call at given block.
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fn call_contract(&self, BlockId, Address, Vec<u8>) -> Result<Vec<u8>, String>;
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}
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/// Service transactions checker.
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#[derive(Default)]
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pub struct ServiceTransactionChecker {
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contract: service_transaction::ServiceTransaction,
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}
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impl ServiceTransactionChecker {
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/// Checks if service transaction can be appended to the transaction queue.
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pub fn check(&self, client: &ContractCaller, tx: &SignedTransaction) -> Result<bool, String> {
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assert!(tx.gas_price.is_zero());
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let address = client.registry_address(SERVICE_TRANSACTION_CONTRACT_REGISTRY_NAME)
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.ok_or_else(|| "contract is not configured")?;
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trace!(target: "txqueue", "Checking service transaction checker contract from {}", address);
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self.contract.functions()
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.certified()
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.call(tx.sender(), &|data| client.call_contract(BlockId::Latest, address, data))
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.map_err(|e| e.to_string())
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}
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}
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