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September 29, 2020 12:50
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aiohttp + tartiflette + aiodataloader ( DOESN'T WORKS!)
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from aiohttp import web | |
import tartiflette | |
from tartiflette_aiohttp import register_graphql_handlers | |
import loader | |
sdl = """ | |
type Query { | |
books: [Book] | |
} | |
type Book { | |
id: String | |
title: String | |
author: Author | |
} | |
type Author { | |
id: String | |
name: String | |
} | |
""" | |
ctx = { | |
'user_service': 1 | |
} | |
@tartiflette.Resolver("Query.books") | |
async def resolver_books(parent, args, ctx, info): | |
return [ | |
{'id': "1", 'title': 'The Great Gatsby'}, | |
{'id': "2", 'title': 'The Great Gatsby'}, | |
{'id': "3", 'title': 'The Great Gatsby'}, | |
{'id': "4", 'title': 'The Great Gatsby'}, | |
{'id': "5", 'title': 'The Great Gatsby'}, | |
{'id': "3", 'title': 'The Great Gatsby'}, | |
] | |
async def batch_resolve_authors(ids): | |
return [{'id': id_, 'name': f'A{id_}'} for id_ in ids] | |
@tartiflette.Resolver("Book.author") | |
async def resolver_books(parent, args, ctx, info): | |
key = parent["id"] | |
return await loader.load_key(batch_resolve_authors, key) | |
web.run_app( | |
register_graphql_handlers( | |
app=web.Application(), | |
engine_sdl=sdl, | |
engine_schema_name="default", | |
executor_context=ctx, | |
executor_http_endpoint='/graphql', | |
executor_http_methods=['POST', 'GET'], | |
context_factory=loader.context | |
) | |
) |
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from __future__ import annotations | |
from contextlib import asynccontextmanager | |
from contextvars import ContextVar | |
from typing import Any, AsyncIterator, Awaitable, List | |
from aiodataloader import DataLoader | |
context_loaders = ContextVar('loaders') | |
def load_key(resolver, key: Any) -> Awaitable[Any]: | |
# For null key return nullable awaitable | |
if key is None: | |
async def _nothing(*args: Any, **kwargs: Any) -> None: | |
return None | |
return _nothing() | |
# Try to select loader from dict of loaders | |
# of the current execution context | |
loaders = context_loaders.get() | |
loader = loaders.get(resolver) | |
# If loader not exist in current context, create new one | |
if not loader: | |
async def _resolver(ids: List[Any]) -> List[Any]: | |
return await resolver(ids) | |
loader = DataLoader(batch_load_fn=_resolver) | |
loaders[resolver] = loader | |
context_loaders.set(loaders) | |
return loader.load(key) | |
@asynccontextmanager | |
async def context(*args, **kwargs) -> AsyncIterator[None]: | |
token = context_loaders.set({}) | |
try: | |
yield | |
finally: | |
context_loaders.reset(token) |
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