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</pre></div><pre class="rust"><code><span class="kw">use </span>actix::Addr;
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<span class="kw">use </span>actix_redis::{resp_array, Command, RedisActor, RespValue};
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<span class="kw">use </span>actix_web::cookie::time::Duration;
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<span class="kw">use </span>anyhow::Error;
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<span class="kw">use </span><span class="kw">super</span>::SessionKey;
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<span class="kw">use </span><span class="kw">crate</span>::storage::{
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interface::{LoadError, SaveError, SessionState, UpdateError},
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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::RedisActorSessionStore};
|
||
/// 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 = "127.0.0.1:6379";
|
||
/// HttpServer::new(move ||
|
||
/// App::new()
|
||
/// .wrap(
|
||
/// SessionMiddleware::new(
|
||
/// RedisActorSessionStore::new(redis_connection_string),
|
||
/// secret_key.clone()
|
||
/// )
|
||
/// )
|
||
/// .default_service(web::to(|| HttpResponse::Ok())))
|
||
/// .bind(("127.0.0.1", 8080))?
|
||
/// .run()
|
||
/// .await
|
||
/// }
|
||
/// ```
|
||
///
|
||
/// # Implementation notes
|
||
///
|
||
/// `RedisActorSessionStore` leverages `actix-redis`'s `RedisActor` implementation - each thread
|
||
/// worker gets its own connection to Redis.
|
||
///
|
||
/// ## Limitations
|
||
///
|
||
/// `RedisActorSessionStore` does not currently support establishing authenticated connections to
|
||
/// Redis. Use [`RedisSessionStore`] if you need TLS support.
|
||
///
|
||
/// [`RedisSessionStore`]: crate::storage::RedisSessionStore
|
||
</span><span class="kw">pub struct </span>RedisActorSessionStore {
|
||
configuration: CacheConfiguration,
|
||
addr: Addr<RedisActor>,
|
||
}
|
||
|
||
<span class="kw">impl </span>RedisActorSessionStore {
|
||
<span class="doccomment">/// A fluent API to configure [`RedisActorSessionStore`].
|
||
///
|
||
/// It takes as input the only required input to create a new instance of
|
||
/// [`RedisActorSessionStore`]—a connection string for Redis.
|
||
</span><span class="kw">pub fn </span>builder<S: Into<String>>(connection_string: S) -> RedisActorSessionStoreBuilder {
|
||
RedisActorSessionStoreBuilder {
|
||
configuration: CacheConfiguration::default(),
|
||
connection_string: connection_string.into(),
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Create a new instance of [`RedisActorSessionStore`] using the default configuration.
|
||
/// It takes as input the only required input to create a new instance of [`RedisActorSessionStore`] - a
|
||
/// connection string for Redis.
|
||
</span><span class="kw">pub fn </span>new<S: Into<String>>(connection_string: S) -> RedisActorSessionStore {
|
||
<span class="self">Self</span>::builder(connection_string).build()
|
||
}
|
||
}
|
||
|
||
<span class="kw">struct </span>CacheConfiguration {
|
||
cache_keygen: Box<<span class="kw">dyn </span>Fn(<span class="kw-2">&</span>str) -> String>,
|
||
}
|
||
|
||
<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: Box::new(str::to_owned),
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// A fluent builder to construct a [`RedisActorSessionStore`] instance with custom configuration
|
||
/// parameters.
|
||
</span><span class="attr">#[must_use]
|
||
</span><span class="kw">pub struct </span>RedisActorSessionStoreBuilder {
|
||
connection_string: String,
|
||
configuration: CacheConfiguration,
|
||
}
|
||
|
||
<span class="kw">impl </span>RedisActorSessionStoreBuilder {
|
||
<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>,
|
||
{
|
||
<span class="self">self</span>.configuration.cache_keygen = Box::new(keygen);
|
||
<span class="self">self
|
||
</span>}
|
||
|
||
<span class="doccomment">/// Finalise the builder and return a [`RedisActorSessionStore`] instance.
|
||
</span><span class="attr">#[must_use]
|
||
</span><span class="kw">pub fn </span>build(<span class="self">self</span>) -> RedisActorSessionStore {
|
||
RedisActorSessionStore {
|
||
configuration: <span class="self">self</span>.configuration,
|
||
addr: RedisActor::start(<span class="self">self</span>.connection_string),
|
||
}
|
||
}
|
||
}
|
||
|
||
<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>RedisActorSessionStore {
|
||
<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>val = <span class="self">self
|
||
</span>.addr
|
||
.send(Command(<span class="macro">resp_array!</span>[<span class="string">"GET"</span>, cache_key]))
|
||
.<span class="kw">await
|
||
</span>.map_err(Into::into)
|
||
.map_err(LoadError::Other)<span class="question-mark">?
|
||
</span>.map_err(Into::into)
|
||
.map_err(LoadError::Other)<span class="question-mark">?</span>;
|
||
|
||
<span class="kw">match </span>val {
|
||
RespValue::Error(err) => <span class="prelude-val">Err</span>(LoadError::Other(<span class="macro">anyhow::anyhow!</span>(err))),
|
||
|
||
RespValue::SimpleString(s) => <span class="prelude-val">Ok</span>(serde_json::from_str(<span class="kw-2">&</span>s)
|
||
.map_err(Into::into)
|
||
.map_err(LoadError::Deserialization)<span class="question-mark">?</span>),
|
||
|
||
RespValue::BulkString(s) => <span class="prelude-val">Ok</span>(serde_json::from_slice(<span class="kw-2">&</span>s)
|
||
.map_err(Into::into)
|
||
.map_err(LoadError::Deserialization)<span class="question-mark">?</span>),
|
||
|
||
<span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</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="kw">let </span>cmd = Command(<span class="macro">resp_array!</span>[
|
||
<span class="string">"SET"</span>,
|
||
cache_key,
|
||
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="macro">format!</span>(<span class="string">"{}"</span>, ttl.whole_seconds())
|
||
]);
|
||
|
||
<span class="kw">let </span>result = <span class="self">self
|
||
</span>.addr
|
||
.send(cmd)
|
||
.<span class="kw">await
|
||
</span>.map_err(Into::into)
|
||
.map_err(SaveError::Other)<span class="question-mark">?
|
||
</span>.map_err(Into::into)
|
||
.map_err(SaveError::Other)<span class="question-mark">?</span>;
|
||
|
||
<span class="kw">match </span>result {
|
||
RespValue::SimpleString(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>(session_key),
|
||
RespValue::Nil => <span class="prelude-val">Err</span>(SaveError::Other(<span class="macro">anyhow::anyhow!</span>(
|
||
<span class="string">"Failed to save session state. A record with the same key already existed in Redis"
|
||
</span>))),
|
||
err => <span class="prelude-val">Err</span>(SaveError::Other(<span class="macro">anyhow::anyhow!</span>(
|
||
<span class="string">"Failed to save session state. {:?}"</span>,
|
||
err
|
||
))),
|
||
}
|
||
}
|
||
|
||
<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>cmd = Command(<span class="macro">resp_array!</span>[
|
||
<span class="string">"SET"</span>,
|
||
cache_key,
|
||
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="macro">format!</span>(<span class="string">"{}"</span>, ttl.whole_seconds())
|
||
]);
|
||
|
||
<span class="kw">let </span>result = <span class="self">self
|
||
</span>.addr
|
||
.send(cmd)
|
||
.<span class="kw">await
|
||
</span>.map_err(Into::into)
|
||
.map_err(UpdateError::Other)<span class="question-mark">?
|
||
</span>.map_err(Into::into)
|
||
.map_err(UpdateError::Other)<span class="question-mark">?</span>;
|
||
|
||
<span class="kw">match </span>result {
|
||
RespValue::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),
|
||
})
|
||
}
|
||
RespValue::SimpleString(<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="kw">let </span>cmd = Command(<span class="macro">resp_array!</span>[
|
||
<span class="string">"EXPIRE"</span>,
|
||
cache_key,
|
||
ttl.whole_seconds().to_string()
|
||
]);
|
||
|
||
<span class="kw">match </span><span class="self">self</span>.addr.send(cmd).<span class="kw">await</span><span class="question-mark">? </span>{
|
||
<span class="prelude-val">Ok</span>(RespValue::Integer(<span class="kw">_</span>)) => <span class="prelude-val">Ok</span>(()),
|
||
val => <span class="prelude-val">Err</span>(<span class="macro">anyhow::anyhow!</span>(
|
||
<span class="string">"Failed to update the session state TTL: {:?}"</span>,
|
||
val
|
||
)),
|
||
}
|
||
}
|
||
|
||
<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="kw">let </span>res = <span class="self">self
|
||
</span>.addr
|
||
.send(Command(<span class="macro">resp_array!</span>[<span class="string">"DEL"</span>, cache_key]))
|
||
.<span class="kw">await</span><span class="question-mark">?</span>;
|
||
|
||
<span class="kw">match </span>res {
|
||
<span class="comment">// Redis returns the number of deleted records
|
||
</span><span class="prelude-val">Ok</span>(RespValue::Integer(<span class="kw">_</span>)) => <span class="prelude-val">Ok</span>(()),
|
||
val => <span class="prelude-val">Err</span>(<span class="macro">anyhow::anyhow!</span>(
|
||
<span class="string">"Failed to remove session from cache. {:?}"</span>,
|
||
val
|
||
)),
|
||
}
|
||
}
|
||
}
|
||
|
||
<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::Duration;
|
||
|
||
<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">fn </span>redis_actor_store() -> RedisActorSessionStore {
|
||
RedisActorSessionStore::new(<span class="string">"127.0.0.1:6379"</span>)
|
||
}
|
||
|
||
<span class="attr">#[actix_web::test]
|
||
</span><span class="kw">async fn </span>test_session_workflow() {
|
||
acceptance_test_suite(redis_actor_store, <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_actor_store();
|
||
<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>updating_of_an_expired_state_is_handled_gracefully() {
|
||
<span class="kw">let </span>store = redis_actor_store();
|
||
<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>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> |