Refactor KVStore range function

llama_stack/providers/impls/meta_reference/agents/persistence.py

@@ -68,10 +68,7 @@ class AgentPersistence:
         )
 
     async def get_session_turns(self, session_id: str) -> List[Turn]:
-        values = await self.kvstore.range(
-            start_key=f"session:{self.agent_id}:{session_id}:",
-            end_key=f"session:{self.agent_id}:{session_id}:\xff\xff\xff\xff",
-        )
+        values = await self.kvstore.get_match(key_to_match=f"session:{self.agent_id}:{session_id}:")
         turns = []
         for value in values:
             try:

llama_stack/providers/utils/kvstore/api.py

@@ -18,4 +18,4 @@ class KVStore(Protocol):
 
     async def delete(self, key: str) -> None: ...
 
-    async def range(self, start_key: str, end_key: str) -> List[str]: ...
+    async def get_match(self, key_to_match: str) -> List[str]: ...

llama_stack/providers/utils/kvstore/kvstore.py

@@ -25,11 +25,11 @@ class InmemoryKVStoreImpl(KVStore):
     async def set(self, key: str, value: str) -> None:
         self._store[key] = value
 
-    async def range(self, start_key: str, end_key: str) -> List[str]:
+    async def get_match(self, key_to_match: str) -> List[str]:
         return [
-            self._store[key]
+            self._store.get[key]
             for key in self._store.keys()
-            if key >= start_key and key < end_key
+            if key.startswith(key_to_match)
         ]
 
 

llama_stack/providers/utils/kvstore/redis/redis.py

@@ -45,8 +45,22 @@ class RedisKVStoreImpl(KVStore):
         key = self._namespaced_key(key)
         await self.redis.delete(key)
 
-    async def range(self, start_key: str, end_key: str) -> List[str]:
-        start_key = self._namespaced_key(start_key)
-        end_key = self._namespaced_key(end_key)
+    async def get_match(self, key_to_match: str) -> List[str]:
+        key_to_match = self._namespaced_key(key_to_match)
 
-        return await self.redis.zrangebylex(start_key, end_key)
+        cursor = 0
+        keys = set()
+
+        while True:
+            cursor, keys_chunk = await self.redis.scan(cursor=cursor, match=f"{key_to_match}*", count=100)
+            keys.update(key.decode() for key in keys_chunk)
+            if cursor == 0:
+                break
+
+        if not keys:
+            return []
+
+        values = await self.redis.mget(*keys)
+        values = [value.decode() for value in values if value is not None]
+
+        return sorted(values)

llama_stack/providers/utils/kvstore/sqlite/sqlite.py

@@ -60,11 +60,11 @@ class SqliteKVStoreImpl(KVStore):
             await db.execute(f"DELETE FROM {self.table_name} WHERE key = ?", (key,))
             await db.commit()
 
-    async def range(self, start_key: str, end_key: str) -> List[str]:
+    async def get_match(self, key_to_match: str) -> List[str]:
         async with aiosqlite.connect(self.db_path) as db:
             async with db.execute(
-                f"SELECT key, value, expiration FROM {self.table_name} WHERE key >= ? AND key <= ?",
-                (start_key, end_key),
+                f"SELECT key, value, expiration FROM {self.table_name} WHERE key LIKE ?",
+                    (f"{key_to_match}%",),
             ) as cursor:
                 result = []
                 async for row in cursor: