39 lines
1.6 KiB
Rust
39 lines
1.6 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 client interface for interacting with the block gas limit contract.
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use client::{BlockChainClient, BlockId};
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use types::header::Header;
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use ethabi::FunctionOutputDecoder;
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use ethabi_contract::use_contract;
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use ethereum_types::{Address, U256};
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use log::{debug, error};
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use_contract!(contract, "res/contracts/block_gas_limit.json");
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pub fn block_gas_limit(full_client: &dyn BlockChainClient, header: &Header, address: Address) -> Option<U256> {
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let (data, decoder) = contract::functions::block_gas_limit::call();
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let value = full_client.call_contract(BlockId::Hash(*header.parent_hash()), address, data).map_err(|err| {
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error!(target: "block_gas_limit", "Contract call failed. Not changing the block gas limit. {:?}", err);
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}).ok()?;
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if value.is_empty() {
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debug!(target: "block_gas_limit", "Contract call returned nothing. Not changing the block gas limit.");
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None
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} else {
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decoder.decode(&value).ok()
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}
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} |