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    // Copyright 2015-2017 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/>.

    //! Block verification utilities.

    pub mod verification;
    pub mod verifier;
    pub mod queue;
    mod canon_verifier;
    mod noop_verifier;

    pub use self::verification::*;
    pub use self::verifier::Verifier;
    pub use self::canon_verifier::CanonVerifier;
    pub use self::noop_verifier::NoopVerifier;
    pub use self::queue::{BlockQueue, Config as QueueConfig, VerificationQueue, QueueInfo};

    /// Verifier type.
    #[derive(Debug, PartialEq, Clone)]
    pub enum VerifierType {
    	/// Verifies block normally.
    	Canon,
    	/// Verifies block normallly, but skips seal verification.
    	CanonNoSeal,
    	/// Does not verify block at all.
    	/// Used in tests.
    	Noop,
    }

    impl Default for VerifierType {
    	fn default() -> Self {
    		VerifierType::Canon
    	}
    }

    /// Create a new verifier based on type.
    pub fn new(v: VerifierType) -> Box<Verifier> {
    	match v {
    		VerifierType::Canon | VerifierType::CanonNoSeal => Box::new(CanonVerifier),
    		VerifierType::Noop => Box::new(NoopVerifier),
    	}
    }

    impl VerifierType {
    	/// Check if seal verification is enabled for this verifier type.
    	pub fn verifying_seal(&self) -> bool {
    		match *self {
    			VerifierType::Canon => true,
    			VerifierType::Noop | VerifierType::CanonNoSeal => false,
    		}
    	}
    }

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