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// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

// OpenEthereum 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 OpenEthereum.  If not, see <http://www.gnu.org/licenses/>.

//! Net rpc implementation.
use jsonrpc_core::Result;
use std::sync::Arc;
use sync::SyncProvider;
use v1::traits::Net;

/// Net rpc implementation.
pub struct NetClient<S: ?Sized> {
    sync: Arc<S>,
    /// Cached `network_id`.
    ///
    /// We cache it to avoid redundant aquire of sync read lock.
    /// https://github.com/openethereum/openethereum/issues/8746
    network_id: u64,
}

impl<S: ?Sized> NetClient<S>
where
    S: SyncProvider,
{
    /// Creates new NetClient.
    pub fn new(sync: &Arc<S>) -> Self {
        NetClient {
            sync: sync.clone(),
            network_id: sync.status().network_id,
        }
    }
}

impl<S: ?Sized> Net for NetClient<S>
where
    S: SyncProvider + 'static,
{
    fn version(&self) -> Result<String> {
        Ok(format!("{}", self.network_id))
    }

    fn peer_count(&self) -> Result<String> {
        Ok(format!("{:#x}", self.sync.status().num_peers as u64))
    }

    fn is_listening(&self) -> Result<bool> {
        // right now (11 march 2016), we are always listening for incoming connections
        //
        // (this may not be true now -- 26 september 2016)
        Ok(true)
    }
}