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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">VecDeque</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">net</span>::<span class="ident">SocketAddr</span>;
<span class="kw">use</span> <span class="ident">redis_async</span>::<span class="ident">client</span>::{<span class="ident">paired_connect</span>, <span class="ident">PairedConnection</span>};
<span class="kw">use</span> <span class="ident">redis_async</span>::<span class="ident">resp</span>::<span class="ident">RespValue</span>;
<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">Mutex</span>;
<span class="kw">use</span> <span class="ident">trust_dns_resolver</span>::<span class="ident">config</span>::{<span class="ident">ResolverConfig</span>, <span class="ident">ResolverOpts</span>};
<span class="kw">use</span> <span class="ident">trust_dns_resolver</span>::<span class="ident">TokioAsyncResolver</span> <span class="kw">as</span> <span class="ident">AsyncResolver</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">Error</span>;
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RedisClient</span> {
<span class="ident">addr</span>: <span class="ident">String</span>,
<span class="ident">connection</span>: <span class="ident">Mutex</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">PairedConnection</span><span class="op">></span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">RedisClient</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">addr</span>: <span class="kw">impl</span> <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">addr</span>: <span class="ident">addr</span>.<span class="ident">into</span>(),
<span class="ident">connection</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>),
}
}
<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">get_connection</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">PairedConnection</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">connection</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">connection</span>.<span class="ident">lock</span>().<span class="kw">await</span>;
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">connection</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">connection</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">connection</span>.<span class="ident">clone</span>());
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">addrs</span> <span class="op">=</span> <span class="ident">resolve</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">addr</span>).<span class="kw">await</span><span class="question-mark">?</span>;
<span class="kw">loop</span> {
<span class="comment">// try to connect</span>
<span class="kw">let</span> <span class="ident">socket_addr</span> <span class="op">=</span> <span class="ident">addrs</span>.<span class="ident">pop_front</span>().<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> {
<span class="ident">log</span>::<span class="macro">warn</span><span class="macro">!</span>(<span class="string">"Cannot connect to {}."</span>, <span class="self">self</span>.<span class="ident">addr</span>);
<span class="ident">Error</span>::<span class="ident">NotConnected</span>
})<span class="question-mark">?</span>;
<span class="kw">match</span> <span class="ident">paired_connect</span>(<span class="ident">socket_addr</span>).<span class="kw">await</span> {
<span class="prelude-val">Ok</span>(<span class="ident">conn</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw-2">*</span><span class="ident">connection</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">conn</span>.<span class="ident">clone</span>());
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">conn</span>);
}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="ident">log</span>::<span class="macro">warn</span><span class="macro">!</span>(
<span class="string">"Attempt to connect to {} as {} failed: {}."</span>,
<span class="self">self</span>.<span class="ident">addr</span>,
<span class="ident">socket_addr</span>,
<span class="ident">err</span>
),
}
}
}
<span class="kw">pub</span> <span class="kw">async</span> <span class="kw">fn</span> <span class="ident">send</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">req</span>: <span class="ident">RespValue</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RespValue</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_connection</span>().<span class="kw">await</span><span class="question-mark">?</span>.<span class="ident">send</span>(<span class="ident">req</span>).<span class="kw">await</span><span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">res</span>)
}
}
<span class="kw">fn</span> <span class="ident">parse_addr</span>(<span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">default_port</span>: <span class="ident">u16</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">u16</span>)<span class="op">></span> {
<span class="comment">// split the string by ':' and convert the second part to u16</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts_iter</span> <span class="op">=</span> <span class="ident">addr</span>.<span class="ident">splitn</span>(<span class="number">2</span>, <span class="string">':'</span>);
<span class="kw">let</span> <span class="ident">host</span> <span class="op">=</span> <span class="ident">parts_iter</span>.<span class="ident">next</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">port_str</span> <span class="op">=</span> <span class="ident">parts_iter</span>.<span class="ident">next</span>().<span class="ident">unwrap_or</span>(<span class="string">""</span>);
<span class="kw">let</span> <span class="ident">port</span>: <span class="ident">u16</span> <span class="op">=</span> <span class="ident">port_str</span>.<span class="ident">parse</span>().<span class="ident">unwrap_or</span>(<span class="ident">default_port</span>);
<span class="prelude-val">Some</span>((<span class="ident">host</span>, <span class="ident">port</span>))
}
<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">resolve</span>(<span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span><span class="ident">SocketAddr</span><span class="op">></span>, <span class="ident">Error</span><span class="op">></span> {
<span class="comment">// try to parse as a regular SocketAddr first</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">addr</span>) <span class="op">=</span> <span class="ident">addr</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">SocketAddr</span><span class="op">></span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">addrs</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">new</span>();
<span class="ident">addrs</span>.<span class="ident">push_back</span>(<span class="ident">addr</span>);
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">addrs</span>);
}
<span class="kw">let</span> (<span class="ident">host</span>, <span class="ident">port</span>) <span class="op">=</span> <span class="ident">parse_addr</span>(<span class="ident">addr</span>, <span class="number">6379</span>).<span class="ident">ok_or</span>(<span class="ident">Error</span>::<span class="ident">InvalidAddress</span>)<span class="question-mark">?</span>;
<span class="comment">// we need to do dns resolution</span>
<span class="kw">let</span> <span class="ident">resolver</span> <span class="op">=</span> <span class="ident">AsyncResolver</span>::<span class="ident">tokio_from_system_conf</span>()
.<span class="ident">or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
<span class="ident">log</span>::<span class="macro">warn</span><span class="macro">!</span>(<span class="string">"Cannot create system DNS resolver: {}"</span>, <span class="ident">err</span>);
<span class="ident">AsyncResolver</span>::<span class="ident">tokio</span>(<span class="ident">ResolverConfig</span>::<span class="ident">default</span>(), <span class="ident">ResolverOpts</span>::<span class="ident">default</span>())
})
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
<span class="ident">log</span>::<span class="macro">error</span><span class="macro">!</span>(<span class="string">"Cannot create DNS resolver: {}"</span>, <span class="ident">err</span>);
<span class="ident">Error</span>::<span class="ident">ResolveError</span>
})<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">addrs</span> <span class="op">=</span> <span class="ident">resolver</span>
.<span class="ident">lookup_ip</span>(<span class="ident">host</span>)
.<span class="kw">await</span>
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">Error</span>::<span class="ident">ResolveError</span>)<span class="question-mark">?</span>
.<span class="ident">into_iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">ip</span><span class="op">|</span> <span class="ident">SocketAddr</span>::<span class="ident">new</span>(<span class="ident">ip</span>, <span class="ident">port</span>))
.<span class="ident">collect</span>();
<span class="prelude-val">Ok</span>(<span class="ident">addrs</span>)
}
</pre></div>
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