User-Defined AQL functions (#37)

* Adding user-defined AQL functions

* Deterministic test

arangoasync/aql.py

@@ -1,7 +1,7 @@
 __all__ = ["AQL", "AQLQueryCache"]
 
 
-from typing import Optional
+from typing import Optional, cast
 
 from arangoasync.cursor import Cursor
 from arangoasync.errno import HTTP_NOT_FOUND
@@ -10,6 +10,9 @@
     AQLCacheConfigureError,
     AQLCacheEntriesError,
     AQLCachePropertiesError,
+    AQLFunctionCreateError,
+    AQLFunctionDeleteError,
+    AQLFunctionListError,
     AQLQueryClearError,
     AQLQueryExecuteError,
     AQLQueryExplainError,
@@ -634,3 +637,117 @@ def response_handler(resp: Response) -> Jsons:
             return self.deserializer.loads_many(resp.raw_body)
 
         return await self._executor.execute(request, response_handler)
+
+    async def functions(self, namespace: Optional[str] = None) -> Result[Jsons]:
+        """List the registered used-defined AQL functions.
+
+        Args:
+            namespace (str | None): Returns all registered AQL user functions from
+                the specified namespace.
+
+        Returns:
+            list: List of the AQL functions defined in the database.
+
+        Raises:
+            AQLFunctionListError: If retrieval fails.
+
+        References:
+            - `list-the-registered-user-defined-aql-functions <https://docs.arangodb.com/stable/develop/http-api/queries/user-defined-aql-functions/#list-the-registered-user-defined-aql-functions>`__
+        """  # noqa: E501
+        params: Json = dict()
+        if namespace is not None:
+            params["namespace"] = namespace
+        request = Request(
+            method=Method.GET,
+            endpoint="/_api/aqlfunction",
+            params=params,
+        )
+
+        def response_handler(resp: Response) -> Jsons:
+            if not resp.is_success:
+                raise AQLFunctionListError(resp, request)
+            result = cast(Jsons, self.deserializer.loads(resp.raw_body).get("result"))
+            if result is None:
+                raise AQLFunctionListError(resp, request)
+            return result
+
+        return await self._executor.execute(request, response_handler)
+
+    async def create_function(
+        self,
+        name: str,
+        code: str,
+        is_deterministic: Optional[bool] = None,
+    ) -> Result[Json]:
+        """Registers a user-defined AQL function (UDF) written in JavaScript.
+
+        Args:
+            name (str): Name of the function.
+            code (str): JavaScript code of the function.
+            is_deterministic (bool | None): If set to `True`, the function is
+                deterministic.
+
+        Returns:
+            dict: Information about the registered function.
+
+        Raises:
+            AQLFunctionCreateError: If registration fails.
+
+        References:
+            - `create-a-user-defined-aql-function <https://docs.arangodb.com/stable/develop/http-api/queries/user-defined-aql-functions/#create-a-user-defined-aql-function>`__
+        """  # noqa: E501
+        request = Request(
+            method=Method.POST,
+            endpoint="/_api/aqlfunction",
+            data=self.serializer.dumps(
+                dict(name=name, code=code, isDeterministic=is_deterministic)
+            ),
+        )
+
+        def response_handler(resp: Response) -> Json:
+            if not resp.is_success:
+                raise AQLFunctionCreateError(resp, request)
+            return self.deserializer.loads(resp.raw_body)
+
+        return await self._executor.execute(request, response_handler)
+
+    async def delete_function(
+        self,
+        name: str,
+        group: Optional[bool] = None,
+        ignore_missing: bool = False,
+    ) -> Result[Json]:
+        """Remove a user-defined AQL function.
+
+        Args:
+            name (str): Name of the function.
+            group (bool | None): If set to `True`, the function name is treated
+                as a namespace prefix.
+            ignore_missing (bool): If set to `True`, will not raise an exception
+                if the function is not found.
+
+        Returns:
+            dict: Information about the removed functions (their count).
+
+        Raises:
+            AQLFunctionDeleteError: If removal fails.
+
+        References:
+            - `remove-a-user-defined-aql-function <https://docs.arangodb.com/stable/develop/http-api/queries/user-defined-aql-functions/#remove-a-user-defined-aql-function>`__
+        """  # noqa: E501
+        params: Json = dict()
+        if group is not None:
+            params["group"] = group
+        request = Request(
+            method=Method.DELETE,
+            endpoint=f"/_api/aqlfunction/{name}",
+            params=params,
+        )
+
+        def response_handler(resp: Response) -> Json:
+            if not resp.is_success:
+                if not (resp.status_code == HTTP_NOT_FOUND and ignore_missing):
+                    raise AQLFunctionDeleteError(resp, request)
+            return self.deserializer.loads(resp.raw_body)
+
+        return await self._executor.execute(request, response_handler)

arangoasync/exceptions.py

@@ -87,6 +87,18 @@ class AQLCachePropertiesError(ArangoServerError):
     """Failed to retrieve query cache properties."""
 
 
+class AQLFunctionCreateError(ArangoServerError):
+    """Failed to create AQL user function."""
+
+
+class AQLFunctionDeleteError(ArangoServerError):
+    """Failed to delete AQL user function."""
+
+
+class AQLFunctionListError(ArangoServerError):
+    """Failed to retrieve AQL user functions."""
+
+
 class AQLQueryClearError(ArangoServerError):
     """Failed to clear slow AQL queries."""
 

tests/test_aql.py

@@ -4,12 +4,20 @@
 import pytest
 from packaging import version
 
-from arangoasync.errno import FORBIDDEN, QUERY_PARSE
+from arangoasync.errno import (
+    FORBIDDEN,
+    QUERY_FUNCTION_INVALID_CODE,
+    QUERY_FUNCTION_NOT_FOUND,
+    QUERY_PARSE,
+)
 from arangoasync.exceptions import (
     AQLCacheClearError,
     AQLCacheConfigureError,
     AQLCacheEntriesError,
     AQLCachePropertiesError,
+    AQLFunctionCreateError,
+    AQLFunctionDeleteError,
+    AQLFunctionListError,
     AQLQueryClearError,
     AQLQueryExecuteError,
     AQLQueryExplainError,
@@ -276,3 +284,82 @@ async def test_cache_plan_management(db, bad_db, doc_col, docs, db_version):
     with pytest.raises(AQLCacheClearError) as err:
         await bad_db.aql.cache.clear_plan()
     assert err.value.error_code == FORBIDDEN
+
+
+@pytest.mark.asyncio
+async def test_aql_function_management(db, bad_db):
+    fn_group = "functions::temperature"
+    fn_name_1 = "functions::temperature::celsius_to_fahrenheit"
+    fn_body_1 = "function (celsius) { return celsius * 1.8 + 32; }"
+    fn_name_2 = "functions::temperature::fahrenheit_to_celsius"
+    fn_body_2 = "function (fahrenheit) { return (fahrenheit - 32) / 1.8; }"
+    bad_fn_name = "functions::temperature::should_not_exist"
+    bad_fn_body = "function (celsius) { invalid syntax }"
+
+    aql = db.aql
+    # List AQL functions
+    assert await aql.functions() == []
+
+    # List AQL functions with bad database
+    with pytest.raises(AQLFunctionListError) as err:
+        await bad_db.aql.functions()
+    assert err.value.error_code == FORBIDDEN
+
+    # Create invalid AQL function
+    with pytest.raises(AQLFunctionCreateError) as err:
+        await aql.create_function(bad_fn_name, bad_fn_body)
+    assert err.value.error_code == QUERY_FUNCTION_INVALID_CODE
+
+    # Create first AQL function
+    result = await aql.create_function(fn_name_1, fn_body_1, is_deterministic=True)
+    assert result["isNewlyCreated"] is True
+    functions = await aql.functions()
+    assert len(functions) == 1
+    assert functions[0]["name"] == fn_name_1
+    assert functions[0]["code"] == fn_body_1
+    assert functions[0]["isDeterministic"] is True
+
+    # Create same AQL function again
+    result = await aql.create_function(fn_name_1, fn_body_1, is_deterministic=True)
+    assert result["isNewlyCreated"] is False
+    functions = await aql.functions()
+    assert len(functions) == 1
+    assert functions[0]["name"] == fn_name_1
+    assert functions[0]["code"] == fn_body_1
+    assert functions[0]["isDeterministic"] is True
+
+    # Create second AQL function
+    result = await aql.create_function(fn_name_2, fn_body_2, is_deterministic=False)
+    assert result["isNewlyCreated"] is True
+    functions = await aql.functions()
+    assert len(functions) == 2
+    assert functions[0]["name"] == fn_name_1
+    assert functions[0]["code"] == fn_body_1
+    assert functions[0]["isDeterministic"] is True
+    assert functions[1]["name"] == fn_name_2
+    assert functions[1]["code"] == fn_body_2
+    assert functions[1]["isDeterministic"] is False
+
+    # Delete first function
+    result = await aql.delete_function(fn_name_1)
+    assert result["deletedCount"] == 1
+    functions = await aql.functions()
+    assert len(functions) == 1
+
+    # Delete missing function
+    with pytest.raises(AQLFunctionDeleteError) as err:
+        await aql.delete_function(fn_name_1)
+    assert err.value.error_code == QUERY_FUNCTION_NOT_FOUND
+    result = await aql.delete_function(fn_name_1, ignore_missing=True)
+    assert "deletedCount" not in result
+
+    # Delete function from bad db
+    with pytest.raises(AQLFunctionDeleteError) as err:
+        await bad_db.aql.delete_function(fn_name_2)
+    assert err.value.error_code == FORBIDDEN
+
+    # Delete function group
+    result = await aql.delete_function(fn_group, group=True)
+    assert result["deletedCount"] == 1
+    functions = await aql.functions()
+    assert len(functions) == 0

tests/test_cursor.py

@@ -128,6 +128,7 @@ async def test_cursor_write_query(db, doc_col, docs):
     cursor = await aql.execute(
         """
         FOR d IN {col} FILTER d.val == @first OR d.val == @second
+        SORT d.val
         UPDATE {{_key: d._key, _val: @val }} IN {col}
         RETURN NEW
         """.format(