// Copyright 2018 Parity Technologies (UK) Ltd.
//
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//! Provides the `TransportExt` trait.

use crate::{bandwidth::BandwidthLogging, bandwidth::BandwidthSinks, ratelimit::RateLimited, Transport};
use std::{io, sync::Arc, time::Duration};
use tokio_executor::DefaultExecutor;

/// Trait automatically implemented on all objects that implement `Transport`. Provides some
/// additional utilities.
///
/// # Example
///
/// ```
/// use libp2p::TransportExt;
/// use libp2p::tcp::TcpConfig;
/// use std::time::Duration;
///
/// let _transport = TcpConfig::new()
///     .with_rate_limit(1024 * 1024, 1024 * 1024);
/// ```
///
pub trait TransportExt: Transport {
    /// Adds a maximum transfer rate to the sockets created with the transport.
    #[inline]
    fn with_rate_limit(
        self,
        max_read_bytes_per_sec: usize,
        max_write_bytes_per_sec: usize,
    ) -> io::Result<RateLimited<Self>>
    where
        Self: Sized,
    {
        RateLimited::new(
            &mut DefaultExecutor::current(),
            self,
            max_read_bytes_per_sec,
            max_write_bytes_per_sec,
        )
    }

    /// Adds a layer on the `Transport` that logs all trafic that passes through the sockets
    /// created by it.
    ///
    /// This method returns an `Arc<BandwidthSinks>` that can be used to retreive the bandwidth
    /// values.
    fn with_bandwidth_logging(self, period: Duration) -> (BandwidthLogging<Self>, Arc<BandwidthSinks>)
    where
        Self: Sized
    {
        BandwidthLogging::new(self, period)
    }

    // TODO: add methods to easily upgrade for secio/mplex/yamux
}

impl<TTransport> TransportExt for TTransport where TTransport: Transport {}