feat: use caching on user lookup

this needs to be deleted/expired on user update, we'll implement this when we get ways to "update" things like channels, servers and users

Cargo.toml

@@ -22,6 +22,7 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 simple_logger = "5.0.0"
 sqlx = { version = "0.8", features = ["runtime-tokio", "tls-native-tls", "postgres"] }
+redis = { version = "0.30", features= ["tokio-comp"] }
 toml = "0.8"
 url = { version = "2.5", features = ["serde"] }
 uuid = { version = "1.16", features = ["serde", "v7"] }

src/api/v1/users/uuid.rs

@@ -1,11 +1,12 @@
 use actix_web::{Error, HttpRequest, HttpResponse, get, web};
 use log::error;
 use serde::Serialize;
+use tokio::sync::Mutex;
 use uuid::Uuid;
 
 use crate::{Data, api::v1::auth::check_access_token, utils::get_auth_header};
 
-#[derive(Serialize)]
+#[derive(Serialize, Clone)]
 struct Response {
     uuid: String,
     username: String,
@@ -34,6 +35,12 @@ pub async fn res(
         return Ok(error);
     }
 
+    let cache_result = data.get_cache_key(uuid.to_string()).await;
+
+    if let Ok(cache_hit) = cache_result {
+        return Ok(HttpResponse::Ok().json(cache_hit))
+    }
+
     let row = sqlx::query_as(&format!(
         "SELECT username, display_name FROM users WHERE uuid = '{}'",
         uuid
@@ -48,9 +55,18 @@ pub async fn res(
 
     let (username, display_name): (String, Option<String>) = row.unwrap();
 
-    Ok(HttpResponse::Ok().json(Response {
+    let user = Response {
         uuid: uuid.to_string(),
         username,
         display_name: display_name.unwrap_or_default(),
-    }))
+    };
+
+    let cache_result = data.set_cache_key(uuid.to_string(), user.clone(), 1800).await;
+
+    if let Err(error) = cache_result {
+        error!("{}", error);
+        return Ok(HttpResponse::InternalServerError().finish());
+    }
+
+    Ok(HttpResponse::Ok().json(user))
 }

src/config.rs

@@ -7,6 +7,7 @@ use tokio::fs::read_to_string;
 #[derive(Debug, Deserialize)]
 pub struct ConfigBuilder {
     database: Database,
+    cache_database: CacheDatabase,
     web: Option<WebBuilder>,
 }
 
@@ -19,6 +20,15 @@ pub struct Database {
     port: u16,
 }
 
+#[derive(Debug, Deserialize, Clone)]
+pub struct CacheDatabase {
+    username: Option<String>,
+    password: Option<String>,
+    host: String,
+    database: Option<String>,
+    port: u16,
+}
+
 #[derive(Debug, Deserialize)]
 struct WebBuilder {
     url: Option<String>,
@@ -51,6 +61,7 @@ impl ConfigBuilder {
 
         Config {
             database: self.database,
+            cache_database: self.cache_database,
             web,
         }
     }
@@ -59,6 +70,7 @@ impl ConfigBuilder {
 #[derive(Debug, Clone)]
 pub struct Config {
     pub database: Database,
+    pub cache_database: CacheDatabase,
     pub web: Web,
 }
 
@@ -78,3 +90,33 @@ impl Database {
             .port(self.port)
     }
 }
+
+impl CacheDatabase {
+    pub fn url(&self) -> String {
+        let mut url = String::from("redis://");
+
+        if let Some(username) = &self.username {
+            url += username;
+        }
+
+        if let Some(password) = &self.password {
+            url += ":";
+            url += password;
+        }
+
+        if self.username.is_some() || self.password.is_some() {
+            url += "@";
+        }
+
+        url += &self.host;
+        url += ":";
+        url += &self.port.to_string();
+
+        if let Some(database) = &self.database {
+            url += "/";
+            url += database;
+        }
+
+        url
+    }
+}

src/main.rs

@@ -2,9 +2,10 @@ use actix_cors::Cors;
 use actix_web::{App, HttpServer, web};
 use argon2::Argon2;
 use clap::Parser;
+use redis::aio::MultiplexedConnection;
 use simple_logger::SimpleLogger;
 use sqlx::{PgPool, Pool, Postgres};
-use std::time::SystemTime;
+use std::{cell::Cell, time::SystemTime};
 mod config;
 use config::{Config, ConfigBuilder};
 mod api;
@@ -23,6 +24,7 @@ struct Args {
 #[derive(Clone)]
 struct Data {
     pub pool: Pool<Postgres>,
+    pub cache_pool: redis::Client,
     pub _config: Config,
     pub argon2: Argon2<'static>,
     pub start_time: SystemTime,
@@ -44,6 +46,8 @@ async fn main() -> Result<(), Error> {
 
     let pool = PgPool::connect_with(config.database.connect_options()).await?;
 
+    let cache_pool = redis::Client::open(config.cache_database.url())?;
+
     /*
     TODO: Figure out if a table should be used here and if not then what.
     Also figure out if these should be different types from what they currently are and if we should add more "constraints"
@@ -81,6 +85,7 @@ async fn main() -> Result<(), Error> {
 
     let data = Data {
         pool,
+        cache_pool,
         _config: config,
         // TODO: Possibly implement "pepper" into this (thinking it could generate one if it doesnt exist and store it on disk)
         argon2: Argon2::default(),

src/utils.rs

@@ -1,6 +1,11 @@
 use actix_web::{cookie::{time::Duration, Cookie, SameSite}, http::header::HeaderMap, HttpResponse};
 use getrandom::fill;
 use hex::encode;
+use redis::{AsyncCommands, RedisError};
+use serde::Serialize;
+use serde_json::json;
+
+use crate::Data;
 
 pub fn get_auth_header(headers: &HeaderMap) -> Result<&str, HttpResponse> {
     let auth_token = headers.get(actix_web::http::header::AUTHORIZATION);
@@ -46,3 +51,25 @@ pub fn generate_refresh_token() -> Result<String, getrandom::Error> {
     Ok(encode(buf))
 }
 
+impl Data {
+    pub async fn set_cache_key(&self, key: String, value: impl Serialize, expire: u32) -> Result<(), RedisError> {
+        let mut conn = self.cache_pool.get_multiplexed_tokio_connection().await?;
+
+        let key_encoded = encode(key);
+
+        let value_json = json!(value).to_string();
+
+        redis::cmd("SET",).arg(&[key_encoded.clone(), value_json]).exec_async(&mut conn).await?;
+
+        redis::cmd("EXPIRE").arg(&[key_encoded, expire.to_string()]).exec_async(&mut conn).await
+    }
+
+    pub async fn get_cache_key(&self, key: String) -> Result<String, RedisError> {
+        let mut conn = self.cache_pool.get_multiplexed_tokio_connection().await?;
+
+        let key_encoded = encode(key);
+
+        redis::cmd("GET").arg(key_encoded).query_async(&mut conn).await
+    }
+}
+