// Copyright 2018 Parity Technologies (UK) Ltd.
//
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// copy of this software and associated documentation files (the "Software"),
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//
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//! Provides the `TransportExt` trait.

use ratelimit::RateLimited;
use std::io;
use tokio_executor::DefaultExecutor;
use Transport;

/// 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,
        )
    }

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

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