Expose aggregation API from SearchIndex (#230)

In order to support more advanced queries, we expose the `aggregate`
method to pass through to the core Redis FT.AGGREGATE API. This PR also
simplifies and standardizes error handling for Redis
searches/aggregations on the index.

redisvl/exceptions.py

@@ -4,3 +4,7 @@ class RedisVLException(Exception):
 
 class RedisModuleVersionError(RedisVLException):
     """Invalid module versions installed"""
+
+
+class RedisSearchError(RedisVLException):
+    """Error while performing a search or aggregate request"""

redisvl/extensions/router/semantic.py

@@ -256,9 +256,9 @@ def _classify_route(
         )
 
         try:
-            aggregation_result: AggregateResult = self._index.client.ft(  # type: ignore
-                self._index.name
-            ).aggregate(aggregate_request, vector_range_query.params)
+            aggregation_result: AggregateResult = self._index.aggregate(
+                aggregate_request, vector_range_query.params
+            )
         except ResponseError as e:
             if "VSS is not yet supported on FT.AGGREGATE" in str(e):
                 raise RuntimeError(
@@ -308,9 +308,9 @@ def _classify_multi_route(
         )
 
         try:
-            aggregation_result: AggregateResult = self._index.client.ft(  # type: ignore
-                self._index.name
-            ).aggregate(aggregate_request, vector_range_query.params)
+            aggregation_result: AggregateResult = self._index.aggregate(
+                aggregate_request, vector_range_query.params
+            )
         except ResponseError as e:
             if "VSS is not yet supported on FT.AGGREGATE" in str(e):
                 raise RuntimeError(

redisvl/index/index.py

@@ -17,6 +17,7 @@
 )
 
 if TYPE_CHECKING:
+    from redis.commands.search.aggregation import AggregateResult
     from redis.commands.search.document import Document
     from redis.commands.search.result import Result
     from redisvl.query.query import BaseQuery
@@ -25,7 +26,7 @@
 import redis.asyncio as aredis
 from redis.commands.search.indexDefinition import IndexDefinition
 
-from redisvl.exceptions import RedisModuleVersionError
+from redisvl.exceptions import RedisModuleVersionError, RedisSearchError
 from redisvl.index.storage import BaseStorage, HashStorage, JsonStorage
 from redisvl.query import BaseQuery, CountQuery, FilterQuery
 from redisvl.query.filter import FilterExpression
@@ -123,36 +124,6 @@ async def wrapper(self, *args, **kwargs):
     return decorator
 
 
-def check_index_exists():
-    def decorator(func):
-        @wraps(func)
-        def wrapper(self, *args, **kwargs):
-            if not self.exists():
-                raise RuntimeError(
-                    f"Index has not been created. Must be created before calling {func.__name__}"
-                )
-            return func(self, *args, **kwargs)
-
-        return wrapper
-
-    return decorator
-
-
-def check_async_index_exists():
-    def decorator(func):
-        @wraps(func)
-        async def wrapper(self, *args, **kwargs):
-            if not await self.exists():
-                raise ValueError(
-                    f"Index has not been created. Must be created before calling {func.__name__}"
-                )
-            return await func(self, *args, **kwargs)
-
-        return wrapper
-
-    return decorator
-
-
 class BaseSearchIndex:
     """Base search engine class"""
 
@@ -486,7 +457,6 @@ def create(self, overwrite: bool = False, drop: bool = False) -> None:
             logger.exception("Error while trying to create the index")
             raise
 
-    @check_index_exists()
     def delete(self, drop: bool = True):
         """Delete the search index while optionally dropping all keys associated
         with the index.
@@ -502,8 +472,8 @@ def delete(self, drop: bool = True):
             self._redis_client.ft(self.schema.index.name).dropindex(  # type: ignore
                 delete_documents=drop
             )
-        except:
-            logger.exception("Error while deleting index")
+        except Exception as e:
+            raise RedisSearchError(f"Error while deleting index: {str(e)}") from e
 
     def clear(self) -> int:
         """Clear all keys in Redis associated with the index, leaving the index
@@ -629,13 +599,29 @@ def fetch(self, id: str) -> Optional[Dict[str, Any]]:
             return convert_bytes(obj[0])
         return None
 
-    @check_index_exists()
+    def aggregate(self, *args, **kwargs) -> "AggregateResult":
+        """Perform an aggregation operation against the index.
+
+        Wrapper around the aggregation API that adds the index name
+        to the query and passes along the rest of the arguments
+        to the redis-py ft().aggregate() method.
+
+        Returns:
+            Result: Raw Redis aggregation results.
+        """
+        try:
+            return self._redis_client.ft(self.schema.index.name).aggregate(  # type: ignore
+                *args, **kwargs
+            )
+        except Exception as e:
+            raise RedisSearchError(f"Error while aggregating: {str(e)}") from e
+
     def search(self, *args, **kwargs) -> "Result":
         """Perform a search against the index.
 
-        Wrapper around redis.search.Search that adds the index name
-        to the search query and passes along the rest of the arguments
-        to the redis-py ft.search() method.
+        Wrapper around the search API that adds the index name
+        to the query and passes along the rest of the arguments
+        to the redis-py ft().search() method.
 
         Returns:
             Result: Raw Redis search results.
@@ -644,9 +630,8 @@ def search(self, *args, **kwargs) -> "Result":
             return self._redis_client.ft(self.schema.index.name).search(  # type: ignore
                 *args, **kwargs
             )
-        except:
-            logger.exception("Error while searching")
-            raise
+        except Exception as e:
+            raise RedisSearchError(f"Error while searching: {str(e)}") from e
 
     def _query(self, query: BaseQuery) -> List[Dict[str, Any]]:
         """Execute a query and process results."""
@@ -752,11 +737,11 @@ def _info(name: str, redis_client: redis.Redis) -> Dict[str, Any]:
         """Run FT.INFO to fetch information about the index."""
         try:
             return convert_bytes(redis_client.ft(name).info())  # type: ignore
-        except:
-            logger.exception(f"Error while fetching {name} index info")
-            raise
+        except Exception as e:
+            raise RedisSearchError(
+                f"Error while fetching {name} index info: {str(e)}"
+            ) from e
 
-    @check_index_exists()
     def info(self, name: Optional[str] = None) -> Dict[str, Any]:
         """Get information about the index.
 
@@ -1010,7 +995,6 @@ async def create(self, overwrite: bool = False, drop: bool = False) -> None:
             logger.exception("Error while trying to create the index")
             raise
 
-    @check_async_index_exists()
     async def delete(self, drop: bool = True):
         """Delete the search index.
 
@@ -1025,9 +1009,8 @@ async def delete(self, drop: bool = True):
             await self._redis_client.ft(self.schema.index.name).dropindex(  # type: ignore
                 delete_documents=drop
             )
-        except:
-            logger.exception("Error while deleting index")
-            raise
+        except Exception as e:
+            raise RedisSearchError(f"Error while deleting index: {str(e)}") from e
 
     async def clear(self) -> int:
         """Clear all keys in Redis associated with the index, leaving the index
@@ -1152,7 +1135,23 @@ async def fetch(self, id: str) -> Optional[Dict[str, Any]]:
             return convert_bytes(obj[0])
         return None
 
-    @check_async_index_exists()
+    async def aggregate(self, *args, **kwargs) -> "AggregateResult":
+        """Perform an aggregation operation against the index.
+
+        Wrapper around the aggregation API that adds the index name
+        to the query and passes along the rest of the arguments
+        to the redis-py ft().aggregate() method.
+
+        Returns:
+            Result: Raw Redis aggregation results.
+        """
+        try:
+            return await self._redis_client.ft(self.schema.index.name).aggregate(  # type: ignore
+                *args, **kwargs
+            )
+        except Exception as e:
+            raise RedisSearchError(f"Error while aggregating: {str(e)}") from e
+
     async def search(self, *args, **kwargs) -> "Result":
         """Perform a search on this index.
 
@@ -1167,9 +1166,8 @@ async def search(self, *args, **kwargs) -> "Result":
             return await self._redis_client.ft(self.schema.index.name).search(  # type: ignore
                 *args, **kwargs
             )
-        except:
-            logger.exception("Error while searching")
-            raise
+        except Exception as e:
+            raise RedisSearchError(f"Error while searching: {str(e)}") from e
 
     async def _query(self, query: BaseQuery) -> List[Dict[str, Any]]:
         """Asynchronously execute a query and process results."""
@@ -1275,11 +1273,11 @@ async def exists(self) -> bool:
     async def _info(name: str, redis_client: aredis.Redis) -> Dict[str, Any]:
         try:
             return convert_bytes(await redis_client.ft(name).info())  # type: ignore
-        except:
-            logger.exception(f"Error while fetching {name} index info")
-            raise
+        except Exception as e:
+            raise RedisSearchError(
+                f"Error while fetching {name} index info: {str(e)}"
+            ) from e
 
-    @check_async_index_exists()
     async def info(self, name: Optional[str] = None) -> Dict[str, Any]:
         """Get information about the index.
 

tests/integration/test_async_search_index.py

@@ -1,5 +1,6 @@
 import pytest
 
+from redisvl.exceptions import RedisSearchError
 from redisvl.index import AsyncSearchIndex
 from redisvl.query import VectorQuery
 from redisvl.redis.utils import convert_bytes
@@ -291,7 +292,7 @@ async def test_check_index_exists_before_delete(async_client, async_index):
     await async_index.set_client(async_client)
     await async_index.create(overwrite=True, drop=True)
     await async_index.delete(drop=True)
-    with pytest.raises(ValueError):
+    with pytest.raises(RedisSearchError):
         await async_index.delete()
 
 
@@ -307,7 +308,7 @@ async def test_check_index_exists_before_search(async_client, async_index):
         return_fields=["user", "credit_score", "age", "job", "location"],
         num_results=7,
     )
-    with pytest.raises(ValueError):
+    with pytest.raises(RedisSearchError):
         await async_index.search(query.query, query_params=query.params)
 
 
@@ -317,5 +318,5 @@ async def test_check_index_exists_before_info(async_client, async_index):
     await async_index.create(overwrite=True, drop=True)
     await async_index.delete(drop=True)
 
-    with pytest.raises(ValueError):
+    with pytest.raises(RedisSearchError):
         await async_index.info()

tests/integration/test_search_index.py

@@ -1,5 +1,6 @@
 import pytest
 
+from redisvl.exceptions import RedisSearchError
 from redisvl.index import SearchIndex
 from redisvl.query import VectorQuery
 from redisvl.redis.connection import RedisConnectionFactory, validate_modules
@@ -251,7 +252,7 @@ def test_check_index_exists_before_delete(client, index):
     index.set_client(client)
     index.create(overwrite=True, drop=True)
     index.delete(drop=True)
-    with pytest.raises(RuntimeError):
+    with pytest.raises(RedisSearchError):
         index.delete()
 
 
@@ -266,7 +267,7 @@ def test_check_index_exists_before_search(client, index):
         return_fields=["user", "credit_score", "age", "job", "location"],
         num_results=7,
     )
-    with pytest.raises(RuntimeError):
+    with pytest.raises(RedisSearchError):
         index.search(query.query, query_params=query.params)
 
 
@@ -275,7 +276,7 @@ def test_check_index_exists_before_info(client, index):
     index.create(overwrite=True, drop=True)
     index.delete(drop=True)
 
-    with pytest.raises(RuntimeError):
+    with pytest.raises(RedisSearchError):
         index.info()