add tick function for memory storage

src/storages/memory.rs

@@ -1,7 +1,8 @@
-use std::{collections::HashMap, pin::Pin};
-
 use anyhow::Ok;
 use async_trait::async_trait;
+use std::time::{Duration, SystemTime};
+use std::{collections::HashMap, pin::Pin};
+use tokio::time::Instant;
 use tokio_stream::{Stream, StreamExt};
 use tokio_util::bytes::Bytes;
 
@@ -9,9 +10,14 @@ use crate::config::MemoryStorageConfig;
 
 use super::Storage;
 
+struct MemoryStorageItem {
+    data: Vec<u8>,
+    added_at: Instant,
+}
+
 pub struct MemoryStorage {
     config: MemoryStorageConfig,
-    items: HashMap<String, Vec<u8>>,
+    items: HashMap<String, MemoryStorageItem>,
 }
 
 impl MemoryStorage {
@@ -34,6 +40,10 @@ impl Storage for MemoryStorage {
     }
 
     async fn tick(&mut self) -> anyhow::Result<()> {
+        let ttl = self.config.ttl;
+        self.items
+            .retain(|_, elt| elt.added_at.elapsed().as_secs() < ttl as u64);
+
         Ok(())
     }
 
@@ -50,7 +60,7 @@ impl Storage for MemoryStorage {
     ) -> Option<Pin<Box<dyn Stream<Item = Result<Bytes, anyhow::Error>> + Send>>> {
         match self.items.get(&key) {
             Some(item) => {
-                let bytes = tokio_util::bytes::Bytes::from(item.clone());
+                let bytes = tokio_util::bytes::Bytes::from(item.data.clone());
                 let stream = futures::stream::iter([Ok(bytes)]);
 
                 Some(Box::pin(stream))
@@ -65,7 +75,13 @@ impl Storage for MemoryStorage {
         mut stream: Pin<Box<dyn Stream<Item = Result<Bytes, anyhow::Error>> + Send>>,
     ) -> anyhow::Result<()> {
         if !self.items.contains_key(&key) {
-            self.items.insert(key.clone(), Vec::new());
+            self.items.insert(
+                key.clone(),
+                MemoryStorageItem {
+                    data: Vec::new(),
+                    added_at: Instant::now(),
+                },
+            );
         }
 
         println!("save {}", key);
@@ -74,6 +90,7 @@ impl Storage for MemoryStorage {
             self.items
                 .get_mut(&key)
                 .unwrap()
+                .data
                 .append(&mut chunk?.to_vec());
         }