Usage of async/await was presented in Flask 2.0. (https://flask.palletsprojects.com/en/2.0.x/async-await/)
I am using Flask-RestX so is it possible to use async/await in RestX requests handlers?
Something like:
@api.route('/try-async')
class MyResource(Resource):
@api.expect(some_schema)
async def get(self):
result = await async_function()
return result
is not working and when I try to reach this endpoint I'm getting error:
TypeError: Object of type coroutine is not JSON serializable
Is there any info on that?
Package versions:
flask==2.0.1
flask-restx==0.4.0
and I've also installed flask[async] as documentation suggests.
I've gotten around this by using an internal redirect
@api.route('/try-async')
class MyResource(Resource):
@api.expect(some_schema)
def get(self):
return redirect(url_for('.hidden_async'), code=307)
@api.route('/hidden-async', methods=['GET'])
async def hidden_async():
result = await async_function()
return result
Redirecting with code=307 will ensure any method and body are unchanged after the redirect (Link). So passing data to the async function is possible as well.
@api.route('/try-async')
class MyResource(Resource):
@api.expect(some_schema)
def post(self):
return redirect(url_for('.hidden_async'), code=307)
@api.route('/hidden-async', methods=['POST'])
async def hidden_async():
data = request.get_json()
tasks = [async_function(d) for d in data]
result = await asyncio.gather(tasks)
return result