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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

//! A generic verifier trait.

use client::{BlockInfo, CallContract};
use engines::EthEngine;
use error::Error;
use header::Header;
use super::verification;

/// Should be used to verify blocks.
pub trait Verifier<C>: Send + Sync
	where C: BlockInfo + CallContract
{
	/// Verify a block relative to its parent and uncles.
	fn verify_block_family(
		&self,
		header: &Header,
		parent: &Header,
		engine: &EthEngine,
		do_full: Option<verification::FullFamilyParams<C>>
	) -> Result<(), Error>;

	/// Do a final verification check for an enacted header vs its expected counterpart.
	fn verify_block_final(&self, expected: &Header, got: &Header) -> Result<(), Error>;
	/// Verify a block, inspecing external state.
	fn verify_block_external(&self, header: &Header, engine: &EthEngine) -> Result<(), Error>;
}