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</pre></div><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() -> Key {
/// # todo!()
/// // [...]
/// }
///
/// #[actix_web::main]
/// async fn main() -> std::io::Result<()> {
/// let secret_key = get_secret_key();
/// let redis_connection_string = "redis://127.0.0.1:6379";
/// 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(("127.0.0.1", 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 = "rediss://127.0.0.1:6379";
/// 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="attr">#[derive(Clone)]
</span><span class="kw">pub struct </span>RedisSessionStore {
configuration: CacheConfiguration,
client: ConnectionManager,
}
<span class="attr">#[derive(Clone)]
</span><span class="kw">struct </span>CacheConfiguration {
cache_keygen: Arc<<span class="kw">dyn </span>Fn(<span class="kw-2">&</span>str) -> String + Send + Sync>,
}
<span class="kw">impl </span>Default <span class="kw">for </span>CacheConfiguration {
<span class="kw">fn </span>default() -> <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<S: Into<String>>(connection_string: S) -> 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<S: Into<String>>(
connection_string: S,
) -> <span class="prelude-ty">Result</span><RedisSessionStore, anyhow::Error> {
<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="attr">#[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<F>(<span class="kw-2">mut </span><span class="self">self</span>, keygen: F) -> <span class="self">Self
</span><span class="kw">where
</span>F: Fn(<span class="kw-2">&</span>str) -> String + <span class="lifetime">'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>) -> <span class="prelude-ty">Result</span><RedisSessionStore, anyhow::Error> {
<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="attr">#[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">&</span><span class="self">self</span>, session_key: <span class="kw-2">&</span>SessionKey) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><SessionState>, LoadError> {
<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><String> = <span class="self">self
</span>.execute_command(redis::cmd(<span class="string">"GET"</span>).arg(<span class="kw-2">&</span>[<span class="kw-2">&</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>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
<span class="prelude-val">Some</span>(value) => <span class="prelude-val">Ok</span>(serde_json::from_str(<span class="kw-2">&</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">&</span><span class="self">self</span>,
session_state: SessionState,
ttl: <span class="kw-2">&</span>Duration,
) -> <span class="prelude-ty">Result</span><SessionKey, SaveError> {
<span class="kw">let </span>body = serde_json::to_string(<span class="kw-2">&</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">"SET"</span>).arg(<span class="kw-2">&</span>[
<span class="kw-2">&</span>cache_key,
<span class="kw-2">&</span>body,
<span class="string">"NX"</span>, <span class="comment">// NX: only set the key if it does not already exist
</span><span class="string">"EX"</span>, <span class="comment">// EX: set expiry
</span><span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"{}"</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">&</span><span class="self">self</span>,
session_key: SessionKey,
session_state: SessionState,
ttl: <span class="kw-2">&</span>Duration,
) -> <span class="prelude-ty">Result</span><SessionKey, UpdateError> {
<span class="kw">let </span>body = serde_json::to_string(<span class="kw-2">&</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">"SET"</span>).arg(<span class="kw-2">&</span>[
<span class="kw-2">&</span>cache_key,
<span class="kw-2">&</span>body,
<span class="string">"XX"</span>, <span class="comment">// XX: Only set the key if it already exist.
</span><span class="string">"EX"</span>, <span class="comment">// EX: set expiry
</span><span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"{}"</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 => {
<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) => UpdateError::Serialization(err),
SaveError::Other(err) => UpdateError::Other(err),
})
}
Value::Int(<span class="kw">_</span>) | Value::Okay | Value::Status(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>(session_key),
val => <span class="prelude-val">Err</span>(UpdateError::Other(<span class="macro">anyhow::anyhow!</span>(
<span class="string">"Failed to update session state. {:?}"</span>,
val
))),
}
}
<span class="kw">async fn </span>update_ttl(<span class="kw-2">&</span><span class="self">self</span>, session_key: <span class="kw-2">&</span>SessionKey, ttl: <span class="kw-2">&</span>Duration) -> <span class="prelude-ty">Result</span><(), Error> {
<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">&</span>cache_key,
ttl.whole_seconds().try_into().context(
<span class="string">"Failed to convert the state TTL into the number of whole seconds remaining"</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">&</span><span class="self">self</span>, session_key: <span class="kw-2">&</span>SessionKey) -> <span class="prelude-ty">Result</span><(), anyhow::Error> {
<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">"DEL"</span>).arg(<span class="kw-2">&</span>[<span class="kw-2">&</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="attr">#[allow(clippy::needless_pass_by_ref_mut)]
</span><span class="kw">async fn </span>execute_command<T: FromRedisValue>(<span class="kw-2">&</span><span class="self">self</span>, cmd: <span class="kw-2">&mut </span>Cmd) -> RedisResult<T> {
<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">&mut </span><span class="self">self</span>.client.clone()).<span class="kw">await </span>{
<span class="prelude-val">Ok</span>(value) => <span class="kw">return </span><span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) => {
<span class="kw">if </span>can_retry && err.is_connection_dropped() {
<span class="macro">tracing::debug!</span>(
<span class="string">"Connection dropped while trying to talk to Redis. Retrying."
</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="attr">#[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() -> RedisSessionStore {
RedisSessionStore::new(<span class="string">"redis://127.0.0.1:6379"</span>)
.<span class="kw">await
</span>.unwrap()
}
<span class="attr">#[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="attr">#[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">&</span>session_key).<span class="kw">await</span>.unwrap().is_none());
}
<span class="attr">#[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::<<span class="kw">_</span>, <span class="kw">_</span>, ()>(session_key.as_ref(), <span class="string">"random-thing-which-is-not-json"</span>)
.<span class="kw">await
</span>.unwrap();
<span class="macro">assert!</span>(<span class="macro">matches!</span>(
store.load(<span class="kw-2">&</span>session_key).<span class="kw">await</span>.unwrap_err(),
LoadError::Deserialization(<span class="kw">_</span>),
));
}
<span class="attr">#[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">&</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></main></body></html>