- update: database client to implement a database trait so we can mock it out

- update unit tests
- add: database client mock

database-service/src/redis_cache.rs

@@ -2,18 +2,23 @@ use deadpool_redis::{Config, Pool, Runtime};
 use redis::{AsyncCommands, RedisError};
 use serde::{de::DeserializeOwned, Serialize};
 
+#[async_trait::async_trait]
+pub trait Cache {
+    fn new(redis_url: &str) -> Self;
+}
+
 pub struct RedisCache {
     pub pool: Pool,
 }
 
-impl RedisCache {
-    pub fn new(redis_url: &str) -> Self {
+impl Cache for RedisCache {
+    fn new(redis_url: &str) -> Self {
         let cfg = Config::from_url(redis_url);
         let pool = cfg.create_pool(Some(Runtime::Tokio1)).expect("Failed to create Redis pool");
         RedisCache { pool }
     }
 
-    pub async fn set<T: Serialize + std::marker::Send + std::marker::Sync>(
+    async fn set<T: Serialize + std::marker::Send + std::marker::Sync>(
         &self,
         key: &String,
         value: &T,
@@ -36,7 +41,7 @@ impl RedisCache {
         conn.set_ex(key, serialized_value, ttl).await
     }
 
-    pub async fn get<T: DeserializeOwned>(&self, key: &String) -> Result<Option<T>, redis::RedisError> {
+    async fn get<T: DeserializeOwned>(&self, key: &String) -> Result<Option<T>, redis::RedisError> {
         let mut conn = self.pool.get().await
             .map_err(|err| {
                 redis::RedisError::from((