forked from STI/Astroport.ONE
70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
from typing import Any, Dict, Optional, Union
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from ...error import GraphQLError
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from ...language import (
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OperationTypeDefinitionNode,
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OperationType,
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SchemaDefinitionNode,
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SchemaExtensionNode,
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VisitorAction,
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SKIP,
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)
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from ...type import GraphQLObjectType
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from . import SDLValidationContext, SDLValidationRule
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__all__ = ["UniqueOperationTypesRule"]
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class UniqueOperationTypesRule(SDLValidationRule):
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"""Unique operation types
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A GraphQL document is only valid if it has only one type per operation.
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"""
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def __init__(self, context: SDLValidationContext):
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super().__init__(context)
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schema = context.schema
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self.defined_operation_types: Dict[
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OperationType, OperationTypeDefinitionNode
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] = {}
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self.existing_operation_types: Dict[
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OperationType, Optional[GraphQLObjectType]
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] = (
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{
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OperationType.QUERY: schema.query_type,
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OperationType.MUTATION: schema.mutation_type,
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OperationType.SUBSCRIPTION: schema.subscription_type,
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}
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if schema
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else {}
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)
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self.schema = schema
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def check_operation_types(
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self, node: Union[SchemaDefinitionNode, SchemaExtensionNode], *_args: Any
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) -> VisitorAction:
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for operation_type in node.operation_types or []:
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operation = operation_type.operation
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already_defined_operation_type = self.defined_operation_types.get(operation)
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if self.existing_operation_types.get(operation):
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self.report_error(
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GraphQLError(
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f"Type for {operation.value} already defined in the schema."
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" It cannot be redefined.",
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operation_type,
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)
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)
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elif already_defined_operation_type:
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self.report_error(
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GraphQLError(
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f"There can be only one {operation.value} type in schema.",
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[already_defined_operation_type, operation_type],
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)
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)
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else:
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self.defined_operation_types[operation] = operation_type
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return SKIP
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enter_schema_definition = enter_schema_extension = check_operation_types
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