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</pre><pre class='rust '>
<span class='doccomment'>//! Client Connection Pooling</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>borrow</span>::<span class='ident'>ToOwned</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>HashMap</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>::{<span class='self'>self</span>, <span class='ident'>Read</span>, <span class='ident'>Write</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>net</span>::{<span class='ident'>SocketAddr</span>, <span class='ident'>Shutdown</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{<span class='ident'>Arc</span>, <span class='ident'>Mutex</span>};

<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>time</span>::<span class='ident'>Duration</span>;

<span class='kw'>use</span> <span class='ident'>net</span>::{<span class='ident'>NetworkConnector</span>, <span class='ident'>NetworkStream</span>, <span class='ident'>DefaultConnector</span>};

<span class='doccomment'>/// The `NetworkConnector` that behaves as a connection pool used by hyper&#39;s `Client`.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Pool</span><span class='op'>&lt;</span><span class='ident'>C</span>: <span class='ident'>NetworkConnector</span><span class='op'>&gt;</span> {
    <span class='ident'>connector</span>: <span class='ident'>C</span>,
    <span class='ident'>inner</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>Mutex</span><span class='op'>&lt;</span><span class='ident'>PoolImpl</span><span class='op'>&lt;&lt;</span><span class='ident'>C</span> <span class='kw'>as</span> <span class='ident'>NetworkConnector</span><span class='op'>&gt;</span>::<span class='ident'>Stream</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>
}

<span class='doccomment'>/// Config options for the `Pool`.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Config</span> {
    <span class='doccomment'>/// The maximum idle connections *per host*.</span>
    <span class='kw'>pub</span> <span class='ident'>max_idle</span>: <span class='ident'>usize</span>,
}

<span class='kw'>impl</span> <span class='ident'>Default</span> <span class='kw'>for</span> <span class='ident'>Config</span> {
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>default</span>() <span class='op'>-&gt;</span> <span class='ident'>Config</span> {
        <span class='ident'>Config</span> {
            <span class='ident'>max_idle</span>: <span class='number'>5</span>,
        }
    }
}

<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>struct</span> <span class='ident'>PoolImpl</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='ident'>conns</span>: <span class='ident'>HashMap</span><span class='op'>&lt;</span><span class='ident'>Key</span>, <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>PooledStreamInner</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
    <span class='ident'>config</span>: <span class='ident'>Config</span>,
}

<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> (<span class='ident'>String</span>, <span class='ident'>u16</span>, <span class='ident'>Scheme</span>);

<span class='kw'>fn</span> <span class='ident'>key</span><span class='op'>&lt;</span><span class='ident'>T</span>: <span class='ident'>Into</span><span class='op'>&lt;</span><span class='ident'>Scheme</span><span class='op'>&gt;&gt;</span>(<span class='ident'>host</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>port</span>: <span class='ident'>u16</span>, <span class='ident'>scheme</span>: <span class='ident'>T</span>) <span class='op'>-&gt;</span> <span class='ident'>Key</span> {
    (<span class='ident'>host</span>.<span class='ident'>to_owned</span>(), <span class='ident'>port</span>, <span class='ident'>scheme</span>.<span class='ident'>into</span>())
}

<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>, <span class='ident'>Debug</span>, <span class='ident'>Hash</span>)]</span>
<span class='kw'>enum</span> <span class='ident'>Scheme</span> {
    <span class='ident'>Http</span>,
    <span class='ident'>Https</span>,
    <span class='ident'>Other</span>(<span class='ident'>String</span>)
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>From</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>Scheme</span> {
    <span class='kw'>fn</span> <span class='ident'>from</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>Scheme</span> {
        <span class='kw'>match</span> <span class='ident'>s</span> {
            <span class='string'>&quot;http&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Scheme</span>::<span class='ident'>Http</span>,
            <span class='string'>&quot;https&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Scheme</span>::<span class='ident'>Https</span>,
            <span class='ident'>s</span> <span class='op'>=&gt;</span> <span class='ident'>Scheme</span>::<span class='ident'>Other</span>(<span class='ident'>String</span>::<span class='ident'>from</span>(<span class='ident'>s</span>))
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>Pool</span><span class='op'>&lt;</span><span class='ident'>DefaultConnector</span><span class='op'>&gt;</span> {
    <span class='doccomment'>/// Creates a `Pool` with a `DefaultConnector`.</span>
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>config</span>: <span class='ident'>Config</span>) <span class='op'>-&gt;</span> <span class='ident'>Pool</span><span class='op'>&lt;</span><span class='ident'>DefaultConnector</span><span class='op'>&gt;</span> {
        <span class='ident'>Pool</span>::<span class='ident'>with_connector</span>(<span class='ident'>config</span>, <span class='ident'>DefaultConnector</span>::<span class='ident'>default</span>())
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>C</span>: <span class='ident'>NetworkConnector</span><span class='op'>&gt;</span> <span class='ident'>Pool</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span> {
    <span class='doccomment'>/// Creates a `Pool` with a specified `NetworkConnector`.</span>
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_connector</span>(<span class='ident'>config</span>: <span class='ident'>Config</span>, <span class='ident'>connector</span>: <span class='ident'>C</span>) <span class='op'>-&gt;</span> <span class='ident'>Pool</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span> {
        <span class='ident'>Pool</span> {
            <span class='ident'>connector</span>: <span class='ident'>connector</span>,
            <span class='ident'>inner</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='ident'>PoolImpl</span> {
                <span class='ident'>conns</span>: <span class='ident'>HashMap</span>::<span class='ident'>new</span>(),
                <span class='ident'>config</span>: <span class='ident'>config</span>,
            }))
        }
    }

    <span class='doccomment'>/// Clear all idle connections from the Pool, closing them.</span>
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>clear_idle</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>().<span class='ident'>conns</span>.<span class='ident'>clear</span>();
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> <span class='ident'>PoolImpl</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='kw'>fn</span> <span class='ident'>reuse</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>key</span>: <span class='ident'>Key</span>, <span class='ident'>conn</span>: <span class='ident'>PooledStreamInner</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span>) {
        <span class='macro'>trace</span><span class='macro'>!</span>(<span class='string'>&quot;reuse {:?}&quot;</span>, <span class='ident'>key</span>);
        <span class='kw'>let</span> <span class='ident'>conns</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>conns</span>.<span class='ident'>entry</span>(<span class='ident'>key</span>).<span class='ident'>or_insert</span>(<span class='macro'>vec</span><span class='macro'>!</span>[]);
        <span class='kw'>if</span> <span class='ident'>conns</span>.<span class='ident'>len</span>() <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>config</span>.<span class='ident'>max_idle</span> {
            <span class='ident'>conns</span>.<span class='ident'>push</span>(<span class='ident'>conn</span>);
        }
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>C</span>: <span class='ident'>NetworkConnector</span><span class='op'>&lt;</span><span class='ident'>Stream</span><span class='op'>=</span><span class='ident'>S</span><span class='op'>&gt;</span>, <span class='ident'>S</span>: <span class='ident'>NetworkStream</span> <span class='op'>+</span> <span class='ident'>Send</span><span class='op'>&gt;</span> <span class='ident'>NetworkConnector</span> <span class='kw'>for</span> <span class='ident'>Pool</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Stream</span> <span class='op'>=</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span>;
    <span class='kw'>fn</span> <span class='ident'>connect</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>host</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>port</span>: <span class='ident'>u16</span>, <span class='ident'>scheme</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> ::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='ident'>key</span>(<span class='ident'>host</span>, <span class='ident'>port</span>, <span class='ident'>scheme</span>);

        <span class='kw'>let</span> <span class='ident'>inner</span> <span class='op'>=</span> {
            <span class='comment'>// keep the mutex locked only in this block</span>
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>locked</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>should_remove</span> <span class='op'>=</span> <span class='bool-val'>false</span>;
            <span class='kw'>let</span> <span class='ident'>inner</span> <span class='op'>=</span> <span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>get_mut</span>(<span class='kw-2'>&amp;</span><span class='ident'>key</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>vec</span><span class='op'>|</span> {
                <span class='macro'>trace</span><span class='macro'>!</span>(<span class='string'>&quot;Pool had connection, using&quot;</span>);
                <span class='ident'>should_remove</span> <span class='op'>=</span> <span class='ident'>vec</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span>;
                <span class='ident'>vec</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>()
            });
            <span class='kw'>if</span> <span class='ident'>should_remove</span> {
                <span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>remove</span>(<span class='kw-2'>&amp;</span><span class='ident'>key</span>);
            }
            <span class='ident'>inner</span>
        };

        <span class='kw'>let</span> <span class='ident'>inner</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>inner</span> {
            <span class='prelude-val'>Some</span>(<span class='ident'>inner</span>) <span class='op'>=&gt;</span> <span class='ident'>inner</span>,
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='ident'>PooledStreamInner</span> {
                <span class='ident'>key</span>: <span class='ident'>key</span>.<span class='ident'>clone</span>(),
                <span class='ident'>stream</span>: <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>connector</span>.<span class='ident'>connect</span>(<span class='ident'>host</span>, <span class='ident'>port</span>, <span class='ident'>scheme</span>)),
                <span class='ident'>previous_response_expected_no_content</span>: <span class='bool-val'>false</span>,
            }

        };
        <span class='prelude-val'>Ok</span>(<span class='ident'>PooledStream</span> {
            <span class='ident'>inner</span>: <span class='prelude-val'>Some</span>(<span class='ident'>inner</span>),
            <span class='ident'>is_closed</span>: <span class='bool-val'>false</span>,
            <span class='ident'>pool</span>: <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>clone</span>(),
        })
    }
}

<span class='doccomment'>/// A Stream that will try to be returned to the Pool when dropped.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='ident'>inner</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>PooledStreamInner</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;&gt;</span>,
    <span class='ident'>is_closed</span>: <span class='ident'>bool</span>,
    <span class='ident'>pool</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>Mutex</span><span class='op'>&lt;</span><span class='ident'>PoolImpl</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
}

<span class='comment'>// manual impl to add the &#39;static bound for 1.7 compat</span>
<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> <span class='kw'>where</span> <span class='ident'>S</span>: <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span> {
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='ident'>fmt</span>.<span class='ident'>debug_struct</span>(<span class='string'>&quot;PooledStream&quot;</span>)
           .<span class='ident'>field</span>(<span class='string'>&quot;inner&quot;</span>, <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>inner</span>)
           .<span class='ident'>field</span>(<span class='string'>&quot;is_closed&quot;</span>, <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>is_closed</span>)
           .<span class='ident'>field</span>(<span class='string'>&quot;pool&quot;</span>, <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>pool</span>)
           .<span class='ident'>finish</span>()
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span>: <span class='ident'>NetworkStream</span><span class='op'>&gt;</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='doccomment'>/// Take the wrapped stream out of the pool completely.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>into_inner</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>S</span> {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>take</span>().<span class='ident'>expect</span>(<span class='string'>&quot;PooledStream lost its inner stream&quot;</span>).<span class='ident'>stream</span>
    }
}

<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>struct</span> <span class='ident'>PooledStreamInner</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='ident'>key</span>: <span class='ident'>Key</span>,
    <span class='ident'>stream</span>: <span class='ident'>S</span>,
    <span class='ident'>previous_response_expected_no_content</span>: <span class='ident'>bool</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span>: <span class='ident'>NetworkStream</span><span class='op'>&gt;</span> <span class='ident'>Read</span> <span class='kw'>for</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>read</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>read</span>(<span class='ident'>buf</span>) {
            <span class='prelude-val'>Ok</span>(<span class='number'>0</span>) <span class='op'>=&gt;</span> {
                <span class='comment'>// if the wrapped stream returns EOF (Ok(0)), that means the</span>
                <span class='comment'>// server has closed the stream. we must be sure this stream</span>
                <span class='comment'>// is dropped and not put back into the pool.</span>
                <span class='self'>self</span>.<span class='ident'>is_closed</span> <span class='op'>=</span> <span class='bool-val'>true</span>;
                <span class='prelude-val'>Ok</span>(<span class='number'>0</span>)
            },
            <span class='ident'>r</span> <span class='op'>=&gt;</span> <span class='ident'>r</span>
        }
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span>: <span class='ident'>NetworkStream</span><span class='op'>&gt;</span> <span class='ident'>Write</span> <span class='kw'>for</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>write</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>write</span>(<span class='ident'>buf</span>)
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>flush</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>flush</span>()
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span>: <span class='ident'>NetworkStream</span><span class='op'>&gt;</span> <span class='ident'>NetworkStream</span> <span class='kw'>for</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>peer_addr</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>SocketAddr</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>peer_addr</span>()
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>set_read_timeout</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>dur</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Duration</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_ref</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>set_read_timeout</span>(<span class='ident'>dur</span>)
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>set_write_timeout</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>dur</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Duration</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_ref</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>set_write_timeout</span>(<span class='ident'>dur</span>)
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>close</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>how</span>: <span class='ident'>Shutdown</span>) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>is_closed</span> <span class='op'>=</span> <span class='bool-val'>true</span>;
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>unwrap</span>().<span class='ident'>stream</span>.<span class='ident'>close</span>(<span class='ident'>how</span>)
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>set_previous_response_expected_no_content</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>expected</span>: <span class='ident'>bool</span>) {
        <span class='macro'>trace</span><span class='macro'>!</span>(<span class='string'>&quot;set_previous_response_expected_no_content {}&quot;</span>, <span class='ident'>expected</span>);
        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>unwrap</span>().<span class='ident'>previous_response_expected_no_content</span> <span class='op'>=</span> <span class='ident'>expected</span>;
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>previous_response_expected_no_content</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='kw'>let</span> <span class='ident'>answer</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_ref</span>().<span class='ident'>unwrap</span>().<span class='ident'>previous_response_expected_no_content</span>;
        <span class='macro'>trace</span><span class='macro'>!</span>(<span class='string'>&quot;previous_response_expected_no_content {}&quot;</span>, <span class='ident'>answer</span>);
        <span class='ident'>answer</span>
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> <span class='ident'>Drop</span> <span class='kw'>for</span> <span class='ident'>PooledStream</span><span class='op'>&lt;</span><span class='ident'>S</span><span class='op'>&gt;</span> {
    <span class='kw'>fn</span> <span class='ident'>drop</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
        <span class='macro'>trace</span><span class='macro'>!</span>(<span class='string'>&quot;PooledStream.drop, is_closed={}&quot;</span>, <span class='self'>self</span>.<span class='ident'>is_closed</span>);
        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>is_closed</span> {
            <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>take</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>inner</span><span class='op'>|</span> {
                <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Ok</span>(<span class='kw-2'>mut</span> <span class='ident'>pool</span>) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>pool</span>.<span class='ident'>lock</span>() {
                    <span class='ident'>pool</span>.<span class='ident'>reuse</span>(<span class='ident'>inner</span>.<span class='ident'>key</span>.<span class='ident'>clone</span>(), <span class='ident'>inner</span>);
                }
                <span class='comment'>// else poisoned, give up</span>
            });
        }
    }
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>net</span>::<span class='ident'>Shutdown</span>;
    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>::<span class='ident'>Read</span>;
    <span class='kw'>use</span> <span class='ident'>mock</span>::{<span class='ident'>MockConnector</span>};
    <span class='kw'>use</span> <span class='ident'>net</span>::{<span class='ident'>NetworkConnector</span>, <span class='ident'>NetworkStream</span>};

    <span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>Pool</span>, <span class='ident'>key</span>};

    <span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>mocked</span> {
        () <span class='op'>=&gt;</span> ({
            <span class='ident'>Pool</span>::<span class='ident'>with_connector</span>(<span class='ident'>Default</span>::<span class='ident'>default</span>(), <span class='ident'>MockConnector</span>)
        })
    }

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_connect_and_drop</span>() {
        <span class='kw'>let</span> <span class='ident'>pool</span> <span class='op'>=</span> <span class='macro'>mocked</span><span class='macro'>!</span>();
        <span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='ident'>key</span>(<span class='string'>&quot;127.0.0.1&quot;</span>, <span class='number'>3000</span>, <span class='string'>&quot;http&quot;</span>);
        <span class='ident'>pool</span>.<span class='ident'>connect</span>(<span class='string'>&quot;127.0.0.1&quot;</span>, <span class='number'>3000</span>, <span class='string'>&quot;http&quot;</span>).<span class='ident'>unwrap</span>();
        {
            <span class='kw'>let</span> <span class='ident'>locked</span> <span class='op'>=</span> <span class='ident'>pool</span>.<span class='ident'>inner</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>len</span>(), <span class='number'>1</span>);
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>get</span>(<span class='kw-2'>&amp;</span><span class='ident'>key</span>).<span class='ident'>unwrap</span>().<span class='ident'>len</span>(), <span class='number'>1</span>);
        }
        <span class='ident'>pool</span>.<span class='ident'>connect</span>(<span class='string'>&quot;127.0.0.1&quot;</span>, <span class='number'>3000</span>, <span class='string'>&quot;http&quot;</span>).<span class='ident'>unwrap</span>(); <span class='comment'>//reused</span>
        {
            <span class='kw'>let</span> <span class='ident'>locked</span> <span class='op'>=</span> <span class='ident'>pool</span>.<span class='ident'>inner</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>len</span>(), <span class='number'>1</span>);
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>get</span>(<span class='kw-2'>&amp;</span><span class='ident'>key</span>).<span class='ident'>unwrap</span>().<span class='ident'>len</span>(), <span class='number'>1</span>);
        }
    }

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_closed</span>() {
        <span class='kw'>let</span> <span class='ident'>pool</span> <span class='op'>=</span> <span class='macro'>mocked</span><span class='macro'>!</span>();
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>stream</span> <span class='op'>=</span> <span class='ident'>pool</span>.<span class='ident'>connect</span>(<span class='string'>&quot;127.0.0.1&quot;</span>, <span class='number'>3000</span>, <span class='string'>&quot;http&quot;</span>).<span class='ident'>unwrap</span>();
        <span class='ident'>stream</span>.<span class='ident'>close</span>(<span class='ident'>Shutdown</span>::<span class='ident'>Both</span>).<span class='ident'>unwrap</span>();
        <span class='ident'>drop</span>(<span class='ident'>stream</span>);
        <span class='kw'>let</span> <span class='ident'>locked</span> <span class='op'>=</span> <span class='ident'>pool</span>.<span class='ident'>inner</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>len</span>(), <span class='number'>0</span>);
    }

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_eof_closes</span>() {
        <span class='kw'>let</span> <span class='ident'>pool</span> <span class='op'>=</span> <span class='macro'>mocked</span><span class='macro'>!</span>();

        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>stream</span> <span class='op'>=</span> <span class='ident'>pool</span>.<span class='ident'>connect</span>(<span class='string'>&quot;127.0.0.1&quot;</span>, <span class='number'>3000</span>, <span class='string'>&quot;http&quot;</span>).<span class='ident'>unwrap</span>();
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>stream</span>.<span class='ident'>read</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [<span class='number'>0</span>]).<span class='ident'>unwrap</span>(), <span class='number'>0</span>);
        <span class='ident'>drop</span>(<span class='ident'>stream</span>);
        <span class='kw'>let</span> <span class='ident'>locked</span> <span class='op'>=</span> <span class='ident'>pool</span>.<span class='ident'>inner</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>locked</span>.<span class='ident'>conns</span>.<span class='ident'>len</span>(), <span class='number'>0</span>);
    }
}
</pre>
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