Created
July 4, 2018 17:29
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Apollo-Server in Python
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| import datetime | |
| from graphql import GraphQLObjectType, GraphQLScalarType, GraphQLSchema, graphql, parse | |
| from graphql.execution.base import ResolveInfo | |
| from graphql.utils.build_ast_schema import build_ast_schema | |
| def build_schema(schema_description: str): | |
| ast_schema = parse(schema_description) | |
| return build_ast_schema(ast_schema) | |
| def execute_request(schema: GraphQLSchema, query: str, root_value: any=None): | |
| query_ast = parse(query) | |
| return graphql(schema, query_ast, root_value) | |
| def default_resolver(context, info: ResolveInfo): | |
| if isinstance(context, dict): | |
| return context.get(info.field_name) | |
| return getattr(context, info.field_name, None) | |
| def make_schema_executable(schema: GraphQLSchema, resolvers: dict) -> GraphQLSchema: | |
| for type_name, type_object in schema.get_type_map().items(): | |
| if isinstance(type_object, GraphQLScalarType): | |
| serializer = resolvers.get(type_name, type_object.serialize) | |
| print(type_name, serializer) | |
| type_object.serialize = serializer | |
| if isinstance(type_object, GraphQLObjectType): | |
| type_resolver = resolvers.get(type_name, {}) | |
| for field_name, field_object in type_object.fields.items(): | |
| field_resolver = type_resolver.get(field_name) or default_resolver | |
| field_object.resolver = field_resolver | |
| TEST_SCHEMA = """ | |
| schema { | |
| query: Query | |
| mutation: Mutation | |
| } | |
| type Mutation { | |
| getToday: Date | |
| addNumbers(a: Int, b: Int): Int | |
| } | |
| scalar Date | |
| type Query { | |
| str: String | |
| int: Int | |
| float: Float | |
| id: ID | |
| bool: Boolean | |
| person: Person | |
| } | |
| type Person { | |
| firstName: String | |
| fullName: String | |
| lastName: String | |
| } | |
| """ | |
| TEST_QUERY = """ | |
| query { | |
| str | |
| bool | |
| id | |
| int | |
| person { | |
| fullName | |
| } | |
| } | |
| """ | |
| TEST_MUTATION = """ | |
| mutation { | |
| today: getToday | |
| addNumbers(a: 1, b: 2) | |
| } | |
| """ | |
| TEST_RESOLVERS = { | |
| 'Date': lambda date: date.isoformat(), | |
| 'Mutation': { | |
| 'addNumbers': lambda *_, a, b: a + b, | |
| 'getToday': lambda *_: datetime.date.today() | |
| }, | |
| 'Query': { | |
| 'str': lambda *_: 'hello world', | |
| 'int': lambda *_: 5, | |
| 'person': lambda *_: {'firstName': 'John', 'lastName': 'Doe'} | |
| }, | |
| 'Person': { | |
| 'fullName': lambda person, *_: '%s %s' % (person['firstName'], person['lastName']) | |
| } | |
| } | |
| schema = build_schema(TEST_SCHEMA) | |
| make_schema_executable(schema, TEST_RESOLVERS) | |
| x = execute_request(schema, TEST_QUERY, {'bool': True}) | |
| print(x.data) | |
| x = execute_request(schema, TEST_MUTATION) | |
| print(x.data) |
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