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</pre><pre class="rust"><code><span class="kw">use </span>std::{convert::TryInto, sync::Arc};

<span class="kw">use </span>actix_web::cookie::time::Duration;
<span class="kw">use </span>anyhow::{Context, Error};
<span class="kw">use </span>redis::{aio::ConnectionManager, AsyncCommands, Cmd, FromRedisValue, RedisResult, Value};

<span class="kw">use </span><span class="kw">super</span>::SessionKey;
<span class="kw">use </span><span class="kw">crate</span>::storage::{
    interface::{LoadError, SaveError, SessionState, UpdateError},
    utils::generate_session_key,
    SessionStore,
};

<span class="doccomment">/// Use Redis as session storage backend.
///
/// ```no_run
/// use actix_web::{web, App, HttpServer, HttpResponse, Error};
/// use actix_session::{SessionMiddleware, storage::RedisSessionStore};
/// use actix_web::cookie::Key;
///
/// // The secret key would usually be read from a configuration file/environment variables.
/// fn get_secret_key() -&gt; Key {
///     # todo!()
///     // [...]
/// }
///
/// #[actix_web::main]
/// async fn main() -&gt; std::io::Result&lt;()&gt; {
///     let secret_key = get_secret_key();
///     let redis_connection_string = &quot;redis://127.0.0.1:6379&quot;;
///     let store = RedisSessionStore::new(redis_connection_string).await.unwrap();
///
///     HttpServer::new(move ||
///             App::new()
///             .wrap(SessionMiddleware::new(
///                 store.clone(),
///                 secret_key.clone()
///             ))
///             .default_service(web::to(|| HttpResponse::Ok())))
///         .bind((&quot;127.0.0.1&quot;, 8080))?
///         .run()
///         .await
/// }
/// ```
///
/// # TLS support
/// Add the `redis-rs-tls-session` feature flag to enable TLS support. You can then establish a TLS
/// connection to Redis using the `rediss://` URL scheme:
///
/// ```no_run
/// use actix_session::{storage::RedisSessionStore};
///
/// # actix_web::rt::System::new().block_on(async {
/// let redis_connection_string = &quot;rediss://127.0.0.1:6379&quot;;
/// let store = RedisSessionStore::new(redis_connection_string).await.unwrap();
/// # })
/// ```
///
/// # Implementation notes
/// `RedisSessionStore` leverages [`redis-rs`] as Redis client.
///
/// [`redis-rs`]: https://github.com/mitsuhiko/redis-rs
</span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;redis-rs-session&quot;</span>)))]
#[derive(Clone)]
</span><span class="kw">pub struct </span>RedisSessionStore {
    configuration: CacheConfiguration,
    client: ConnectionManager,
}

<span class="attribute">#[derive(Clone)]
</span><span class="kw">struct </span>CacheConfiguration {
    cache_keygen: Arc&lt;<span class="kw">dyn </span>Fn(<span class="kw-2">&amp;</span>str) -&gt; String + Send + Sync&gt;,
}

<span class="kw">impl </span>Default <span class="kw">for </span>CacheConfiguration {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        <span class="self">Self </span>{
            cache_keygen: Arc::new(str::to_owned),
        }
    }
}

<span class="kw">impl </span>RedisSessionStore {
    <span class="doccomment">/// A fluent API to configure [`RedisSessionStore`].
    /// It takes as input the only required input to create a new instance of [`RedisSessionStore`] - a
    /// connection string for Redis.
    </span><span class="kw">pub fn </span>builder&lt;S: Into&lt;String&gt;&gt;(connection_string: S) -&gt; RedisSessionStoreBuilder {
        RedisSessionStoreBuilder {
            configuration: CacheConfiguration::default(),
            connection_string: connection_string.into(),
        }
    }

    <span class="doccomment">/// Create a new instance of [`RedisSessionStore`] using the default configuration.
    /// It takes as input the only required input to create a new instance of [`RedisSessionStore`] - a
    /// connection string for Redis.
    </span><span class="kw">pub async fn </span>new&lt;S: Into&lt;String&gt;&gt;(
        connection_string: S,
    ) -&gt; <span class="prelude-ty">Result</span>&lt;RedisSessionStore, anyhow::Error&gt; {
        <span class="self">Self</span>::builder(connection_string).build().<span class="kw">await
    </span>}
}

<span class="doccomment">/// A fluent builder to construct a [`RedisSessionStore`] instance with custom configuration
/// parameters.
///
/// [`RedisSessionStore`]: crate::storage::RedisSessionStore
</span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;redis-rs-session&quot;</span>)))]
#[must_use]
</span><span class="kw">pub struct </span>RedisSessionStoreBuilder {
    connection_string: String,
    configuration: CacheConfiguration,
}

<span class="kw">impl </span>RedisSessionStoreBuilder {
    <span class="doccomment">/// Set a custom cache key generation strategy, expecting a session key as input.
    </span><span class="kw">pub fn </span>cache_keygen&lt;F&gt;(<span class="kw-2">mut </span><span class="self">self</span>, keygen: F) -&gt; <span class="self">Self
    </span><span class="kw">where
        </span>F: Fn(<span class="kw-2">&amp;</span>str) -&gt; String + <span class="lifetime">&#39;static </span>+ Send + Sync,
    {
        <span class="self">self</span>.configuration.cache_keygen = Arc::new(keygen);
        <span class="self">self
    </span>}

    <span class="doccomment">/// Finalise the builder and return a [`RedisActorSessionStore`] instance.
    ///
    /// [`RedisActorSessionStore`]: crate::storage::RedisActorSessionStore
    </span><span class="kw">pub async fn </span>build(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;RedisSessionStore, anyhow::Error&gt; {
        <span class="kw">let </span>client = ConnectionManager::new(redis::Client::open(<span class="self">self</span>.connection_string)<span class="question-mark">?</span>).<span class="kw">await</span><span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(RedisSessionStore {
            configuration: <span class="self">self</span>.configuration,
            client,
        })
    }
}

<span class="attribute">#[async_trait::async_trait(<span class="question-mark">?</span>Send)]
</span><span class="kw">impl </span>SessionStore <span class="kw">for </span>RedisSessionStore {
    <span class="kw">async fn </span>load(<span class="kw-2">&amp;</span><span class="self">self</span>, session_key: <span class="kw-2">&amp;</span>SessionKey) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;SessionState&gt;, LoadError&gt; {
        <span class="kw">let </span>cache_key = (<span class="self">self</span>.configuration.cache_keygen)(session_key.as_ref());

        <span class="kw">let </span>value: <span class="prelude-ty">Option</span>&lt;String&gt; = <span class="self">self
            </span>.execute_command(redis::cmd(<span class="string">&quot;GET&quot;</span>).arg(<span class="kw-2">&amp;</span>[<span class="kw-2">&amp;</span>cache_key]))
            .<span class="kw">await
            </span>.map_err(Into::into)
            .map_err(LoadError::Other)<span class="question-mark">?</span>;

        <span class="kw">match </span>value {
            <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
            <span class="prelude-val">Some</span>(value) =&gt; <span class="prelude-val">Ok</span>(serde_json::from_str(<span class="kw-2">&amp;</span>value)
                .map_err(Into::into)
                .map_err(LoadError::Deserialization)<span class="question-mark">?</span>),
        }
    }

    <span class="kw">async fn </span>save(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        session_state: SessionState,
        ttl: <span class="kw-2">&amp;</span>Duration,
    ) -&gt; <span class="prelude-ty">Result</span>&lt;SessionKey, SaveError&gt; {
        <span class="kw">let </span>body = serde_json::to_string(<span class="kw-2">&amp;</span>session_state)
            .map_err(Into::into)
            .map_err(SaveError::Serialization)<span class="question-mark">?</span>;
        <span class="kw">let </span>session_key = generate_session_key();
        <span class="kw">let </span>cache_key = (<span class="self">self</span>.configuration.cache_keygen)(session_key.as_ref());

        <span class="self">self</span>.execute_command(redis::cmd(<span class="string">&quot;SET&quot;</span>).arg(<span class="kw-2">&amp;</span>[
            <span class="kw-2">&amp;</span>cache_key,
            <span class="kw-2">&amp;</span>body,
            <span class="string">&quot;NX&quot;</span>, <span class="comment">// NX: only set the key if it does not already exist
            </span><span class="string">&quot;EX&quot;</span>, <span class="comment">// EX: set expiry
            </span><span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, ttl.whole_seconds()),
        ]))
        .<span class="kw">await
        </span>.map_err(Into::into)
        .map_err(SaveError::Other)<span class="question-mark">?</span>;

        <span class="prelude-val">Ok</span>(session_key)
    }

    <span class="kw">async fn </span>update(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        session_key: SessionKey,
        session_state: SessionState,
        ttl: <span class="kw-2">&amp;</span>Duration,
    ) -&gt; <span class="prelude-ty">Result</span>&lt;SessionKey, UpdateError&gt; {
        <span class="kw">let </span>body = serde_json::to_string(<span class="kw-2">&amp;</span>session_state)
            .map_err(Into::into)
            .map_err(UpdateError::Serialization)<span class="question-mark">?</span>;

        <span class="kw">let </span>cache_key = (<span class="self">self</span>.configuration.cache_keygen)(session_key.as_ref());

        <span class="kw">let </span>v: redis::Value = <span class="self">self
            </span>.execute_command(redis::cmd(<span class="string">&quot;SET&quot;</span>).arg(<span class="kw-2">&amp;</span>[
                <span class="kw-2">&amp;</span>cache_key,
                <span class="kw-2">&amp;</span>body,
                <span class="string">&quot;XX&quot;</span>, <span class="comment">// XX: Only set the key if it already exist.
                </span><span class="string">&quot;EX&quot;</span>, <span class="comment">// EX: set expiry
                </span><span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, ttl.whole_seconds()),
            ]))
            .<span class="kw">await
            </span>.map_err(Into::into)
            .map_err(UpdateError::Other)<span class="question-mark">?</span>;

        <span class="kw">match </span>v {
            Value::Nil =&gt; {
                <span class="comment">// The SET operation was not performed because the XX condition was not verified.
                // This can happen if the session state expired between the load operation and the
                // update operation. Unlucky, to say the least. We fall back to the `save` routine
                // to ensure that the new key is unique.
                </span><span class="self">self</span>.save(session_state, ttl)
                    .<span class="kw">await
                    </span>.map_err(|err| <span class="kw">match </span>err {
                        SaveError::Serialization(err) =&gt; UpdateError::Serialization(err),
                        SaveError::Other(err) =&gt; UpdateError::Other(err),
                    })
            }
            Value::Int(<span class="kw">_</span>) | Value::Okay | Value::Status(<span class="kw">_</span>) =&gt; <span class="prelude-val">Ok</span>(session_key),
            val =&gt; <span class="prelude-val">Err</span>(UpdateError::Other(<span class="macro">anyhow::anyhow!</span>(
                <span class="string">&quot;Failed to update session state. {:?}&quot;</span>,
                val
            ))),
        }
    }

    <span class="kw">async fn </span>update_ttl(<span class="kw-2">&amp;</span><span class="self">self</span>, session_key: <span class="kw-2">&amp;</span>SessionKey, ttl: <span class="kw-2">&amp;</span>Duration) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
        <span class="kw">let </span>cache_key = (<span class="self">self</span>.configuration.cache_keygen)(session_key.as_ref());

        <span class="self">self</span>.client
            .clone()
            .expire(
                <span class="kw-2">&amp;</span>cache_key,
                ttl.whole_seconds().try_into().context(
                    <span class="string">&quot;Failed to convert the state TTL into the number of whole seconds remaining&quot;</span>,
                )<span class="question-mark">?</span>,
            )
            .<span class="kw">await</span><span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">async fn </span>delete(<span class="kw-2">&amp;</span><span class="self">self</span>, session_key: <span class="kw-2">&amp;</span>SessionKey) -&gt; <span class="prelude-ty">Result</span>&lt;(), anyhow::Error&gt; {
        <span class="kw">let </span>cache_key = (<span class="self">self</span>.configuration.cache_keygen)(session_key.as_ref());
        <span class="self">self</span>.execute_command(redis::cmd(<span class="string">&quot;DEL&quot;</span>).arg(<span class="kw-2">&amp;</span>[<span class="kw-2">&amp;</span>cache_key]))
            .<span class="kw">await
            </span>.map_err(Into::into)
            .map_err(UpdateError::Other)<span class="question-mark">?</span>;

        <span class="prelude-val">Ok</span>(())
    }
}

<span class="kw">impl </span>RedisSessionStore {
    <span class="doccomment">/// Execute Redis command and retry once in certain cases.
    ///
    /// `ConnectionManager` automatically reconnects when it encounters an error talking to Redis.
    /// The request that bumped into the error, though, fails.
    ///
    /// This is generally OK, but there is an unpleasant edge case: Redis client timeouts. The
    /// server is configured to drop connections who have been active longer than a pre-determined
    /// threshold. `redis-rs` does not proactively detect that the connection has been dropped - you
    /// only find out when you try to use it.
    ///
    /// This helper method catches this case (`.is_connection_dropped`) to execute a retry. The
    /// retry will be executed on a fresh connection, therefore it is likely to succeed (or fail for
    /// a different more meaningful reason).
    </span><span class="kw">async fn </span>execute_command&lt;T: FromRedisValue&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, cmd: <span class="kw-2">&amp;mut </span>Cmd) -&gt; RedisResult&lt;T&gt; {
        <span class="kw">let </span><span class="kw-2">mut </span>can_retry = <span class="bool-val">true</span>;

        <span class="kw">loop </span>{
            <span class="kw">match </span>cmd.query_async(<span class="kw-2">&amp;mut </span><span class="self">self</span>.client.clone()).<span class="kw">await </span>{
                <span class="prelude-val">Ok</span>(value) =&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(value),
                <span class="prelude-val">Err</span>(err) =&gt; {
                    <span class="kw">if </span>can_retry &amp;&amp; err.is_connection_dropped() {
                        <span class="macro">tracing::debug!</span>(
                            <span class="string">&quot;Connection dropped while trying to talk to Redis. Retrying.&quot;
                        </span>);

                        <span class="comment">// Retry at most once
                        </span>can_retry = <span class="bool-val">false</span>;

                        <span class="kw">continue</span>;
                    } <span class="kw">else </span>{
                        <span class="kw">return </span><span class="prelude-val">Err</span>(err);
                    }
                }
            }
        }
    }
}

<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
    <span class="kw">use </span>std::collections::HashMap;

    <span class="kw">use </span>actix_web::cookie::time;
    <span class="kw">use </span>redis::AsyncCommands;

    <span class="kw">use super</span>::<span class="kw-2">*</span>;
    <span class="kw">use </span><span class="kw">crate</span>::test_helpers::acceptance_test_suite;

    <span class="kw">async fn </span>redis_store() -&gt; RedisSessionStore {
        RedisSessionStore::new(<span class="string">&quot;redis://127.0.0.1:6379&quot;</span>)
            .<span class="kw">await
            </span>.unwrap()
    }

    <span class="attribute">#[actix_web::test]
    </span><span class="kw">async fn </span>test_session_workflow() {
        <span class="kw">let </span>redis_store = redis_store().<span class="kw">await</span>;
        acceptance_test_suite(<span class="kw">move </span>|| redis_store.clone(), <span class="bool-val">true</span>).<span class="kw">await</span>;
    }

    <span class="attribute">#[actix_web::test]
    </span><span class="kw">async fn </span>loading_a_missing_session_returns_none() {
        <span class="kw">let </span>store = redis_store().<span class="kw">await</span>;
        <span class="kw">let </span>session_key = generate_session_key();
        <span class="macro">assert!</span>(store.load(<span class="kw-2">&amp;</span>session_key).<span class="kw">await</span>.unwrap().is_none());
    }

    <span class="attribute">#[actix_web::test]
    </span><span class="kw">async fn </span>loading_an_invalid_session_state_returns_deserialization_error() {
        <span class="kw">let </span>store = redis_store().<span class="kw">await</span>;
        <span class="kw">let </span>session_key = generate_session_key();
        store
            .client
            .clone()
            .set::&lt;<span class="kw">_</span>, <span class="kw">_</span>, ()&gt;(session_key.as_ref(), <span class="string">&quot;random-thing-which-is-not-json&quot;</span>)
            .<span class="kw">await
            </span>.unwrap();
        <span class="macro">assert!</span>(<span class="macro">matches!</span>(
            store.load(<span class="kw-2">&amp;</span>session_key).<span class="kw">await</span>.unwrap_err(),
            LoadError::Deserialization(<span class="kw">_</span>),
        ));
    }

    <span class="attribute">#[actix_web::test]
    </span><span class="kw">async fn </span>updating_of_an_expired_state_is_handled_gracefully() {
        <span class="kw">let </span>store = redis_store().<span class="kw">await</span>;
        <span class="kw">let </span>session_key = generate_session_key();
        <span class="kw">let </span>initial_session_key = session_key.as_ref().to_owned();
        <span class="kw">let </span>updated_session_key = store
            .update(session_key, HashMap::new(), <span class="kw-2">&amp;</span>time::Duration::seconds(<span class="number">1</span>))
            .<span class="kw">await
            </span>.unwrap();
        <span class="macro">assert_ne!</span>(initial_session_key, updated_session_key.as_ref());
    }
}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="actix_session" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.65.0-nightly (1d37ed661 2022-09-09)" ></div></body></html>