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import asyncio
from typing import Awaitable
from pytest import mark
from graphql.execution import execute
from graphql.language import parse
from graphql.type import (
GraphQLSchema,
GraphQLObjectType,
GraphQLField,
GraphQLList,
GraphQLInterfaceType,
GraphQLBoolean,
GraphQLInt,
GraphQLString,
)
class Barrier:
"""Barrier that makes progress only after a certain number of waits."""
def __init__(self, number: int):
self.event = asyncio.Event()
self.number = number
async def wait(self) -> bool:
self.number -= 1
if not self.number:
self.event.set()
return await self.event.wait()
def describe_parallel_execution():
@mark.asyncio
async def resolve_fields_in_parallel():
barrier = Barrier(2)
async def resolve(*_args):
return await barrier.wait()
schema = GraphQLSchema(
GraphQLObjectType(
"Query",
{
"foo": GraphQLField(GraphQLBoolean, resolve=resolve),
"bar": GraphQLField(GraphQLBoolean, resolve=resolve),
},
)
)
ast = parse("{foo, bar}")
# raises TimeoutError if not parallel
awaitable_result = execute(schema, ast)
assert isinstance(awaitable_result, Awaitable)
result = await asyncio.wait_for(awaitable_result, 1.0)
assert result == ({"foo": True, "bar": True}, None)
@mark.asyncio
async def resolve_list_in_parallel():
barrier = Barrier(2)
async def resolve(*_args):
return await barrier.wait()
async def resolve_list(*args):
return [resolve(*args), resolve(*args)]
schema = GraphQLSchema(
GraphQLObjectType(
"Query",
{
"foo": GraphQLField(
GraphQLList(GraphQLBoolean), resolve=resolve_list
)
},
)
)
ast = parse("{foo}")
# raises TimeoutError if not parallel
awaitable_result = execute(schema, ast)
assert isinstance(awaitable_result, Awaitable)
result = await asyncio.wait_for(awaitable_result, 1.0)
assert result == ({"foo": [True, True]}, None)
@mark.asyncio
async def resolve_is_type_of_in_parallel():
FooType = GraphQLInterfaceType("Foo", {"foo": GraphQLField(GraphQLString)})
barrier = Barrier(4)
async def is_type_of_bar(obj, *_args):
await barrier.wait()
return obj["foo"] == "bar"
BarType = GraphQLObjectType(
"Bar",
{"foo": GraphQLField(GraphQLString), "foobar": GraphQLField(GraphQLInt)},
interfaces=[FooType],
is_type_of=is_type_of_bar,
)
async def is_type_of_baz(obj, *_args):
await barrier.wait()
return obj["foo"] == "baz"
BazType = GraphQLObjectType(
"Baz",
{"foo": GraphQLField(GraphQLString), "foobaz": GraphQLField(GraphQLInt)},
interfaces=[FooType],
is_type_of=is_type_of_baz,
)
schema = GraphQLSchema(
GraphQLObjectType(
"Query",
{
"foo": GraphQLField(
GraphQLList(FooType),
resolve=lambda *_args: [
{"foo": "bar", "foobar": 1},
{"foo": "baz", "foobaz": 2},
],
)
},
),
types=[BarType, BazType],
)
ast = parse(
"""
{
foo {
foo
... on Bar { foobar }
... on Baz { foobaz }
}
}
"""
)
# raises TimeoutError if not parallel
awaitable_result = execute(schema, ast)
assert isinstance(awaitable_result, Awaitable)
result = await asyncio.wait_for(awaitable_result, 1.0)
assert result == (
{"foo": [{"foo": "bar", "foobar": 1}, {"foo": "baz", "foobaz": 2}]},
None,
)
|
