Skip non-cacheable scenarios

src/service/emoji_cache.rs

@@ -98,13 +98,16 @@ impl EmojiCacheService {
         }
         drop(read);
 
-        let emoji = self
+        let emoji = if to_resolve.is_empty() {
-            .db
+            Vec::new()
+        } else {
+            self.db
                 .fetch_many_emojis(&to_resolve, host)
                 .await?
                 .into_iter()
                 .map(Arc::new)
-            .collect::<Vec<_>>();
+                .collect::<Vec<_>>()
+        };
         resolved.extend(emoji.iter().cloned());
 
         let mut write = self.cache.lock().await;
@@ -148,13 +151,16 @@ impl EmojiCacheService {
         }
         drop(read);
 
-        let emoji = self
+        let emoji = if to_resolve.is_empty() {
-            .db
+            Vec::new()
+        } else {
+            self.db
                 .fetch_many_tagged_emojis(&to_resolve)
                 .await?
                 .into_iter()
                 .map(Arc::new)
-            .collect::<Vec<_>>();
+                .collect::<Vec<_>>()
+        };
         resolved.extend(emoji.iter().cloned());
 
         let mut write = self.cache.lock().await;

src/service/instance_cache.rs

@@ -1,6 +1,7 @@
 use crate::web::ApiError;
 use lru::LruCache;
 use magnetar_calckey_model::{ck, CalckeyDbError, CalckeyModel};
+use magnetar_common::config::MagnetarConfig;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 use strum::EnumVariantNames;
@@ -44,10 +45,16 @@ pub struct RemoteInstanceCacheService {
     cache: Mutex<LruCache<String, CacheEntry>>,
     lifetime_max: Duration,
     db: CalckeyModel,
+    config: &'static MagnetarConfig,
 }
 
 impl RemoteInstanceCacheService {
-    pub(super) fn new(db: CalckeyModel, cache_size: usize, entry_lifetime: Duration) -> Self {
+    pub(super) fn new(
+        db: CalckeyModel,
+        config: &'static MagnetarConfig,
+        cache_size: usize,
+        entry_lifetime: Duration,
+    ) -> Self {
         const CACHE_SIZE: usize = 256;
 
         Self {
@@ -58,6 +65,7 @@ impl RemoteInstanceCacheService {
             )),
             lifetime_max: entry_lifetime,
             db,
+            config,
         }
     }
 
@@ -65,6 +73,10 @@ impl RemoteInstanceCacheService {
         &self,
         host: &str,
     ) -> Result<Option<Arc<ck::instance::Model>>, RemoteInstanceCacheError> {
+        if host == self.config.networking.host {
+            return Ok(None);
+        }
+
         let mut read = self.cache.lock().await;
         if let Some(item) = read.peek(host) {
             if item.created + self.lifetime_max >= Instant::now() {

src/service/mod.rs

@@ -51,6 +51,7 @@ impl MagnetarService {
         let emoji_cache = emoji_cache::EmojiCacheService::new(db.clone());
         let remote_instance_cache = instance_cache::RemoteInstanceCacheService::new(
             db.clone(),
+            config,
             256,
             Duration::from_secs(100),
         );