// 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/>.

//! Connection filter trait.

use super::NodeId;

/// Filtered connection direction.
pub enum ConnectionDirection {
	Inbound,
	Outbound,
}

/// Connection filter. Each connection is checked against `connection_allowed`.
pub trait ConnectionFilter : Send + Sync {
	/// Filter a connection. Returns `true` if connection should be allowed. `false` if rejected.
	fn connection_allowed(&self, own_id: &NodeId, connecting_id: &NodeId, direction: ConnectionDirection) -> bool;
}