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

use crate::{bandwidth::BandwidthLogging, bandwidth::BandwidthSinks, Transport};
use std::sync::Arc;

/// Trait automatically implemented on all objects that implement `Transport`. Provides some
/// additional utilities.
pub trait TransportExt: Transport {
    /// 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 total number
    /// of bytes transferred through the sockets.
    fn with_bandwidth_logging(self) -> (BandwidthLogging<Self>, Arc<BandwidthSinks>)
    where
        Self: Sized
    {
        BandwidthLogging::new(self)
    }

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

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