updated cache

util/cache/structs.go

@@ -2,15 +2,15 @@ package cache
 
 import (
 	"sync"
+	"sync/atomic"
 )
 
-type ShardedCache struct {
-	shards    []*shard
-	shardMask uint32
+type Cache struct {
+	mu    sync.Mutex
+	state atomic.Pointer[mappings]
 }
 
-type shard struct {
-	mu  sync.RWMutex
-	s2c map[string]string // serverId -> channelId
-	c2s map[string]string // channelId -> serverId
+type mappings struct {
+	s2c map[string]string
+	c2s map[string]string
 }