Asynchronous HTTP requests to AWS Lambda API endpoints

async_lambda.py

'''
Non-blocking concurrent requests to AWS Lambda API endpoints
with Python asyncio and aiohttp

HOW TO:

1. Prepare a list of invocation parameters:

requests = [
    {
        'function_name': 'your-lambda-function',
        'payload': {
            'hello': 'world',
        },
    },
    {
        'function_name': 'yet-another-function',
        'payload': {
            'foo': 'bar',
        },
]

2. Call the invoke_all method:

results = invoke_all(
    requests=requests,
    region='us-east-1',  # Any valid AWS region
)

3. Results will be returned in the same order of requests

    Credits to Mathew Marcus (2019)
    https://www.mathewmarcus.com/blog/
    http://archive.is/nXkCb
'''
import asyncio
import json
import os
from typing import Dict, List
import urllib

import aiohttp
from botocore import session, awsrequest, auth


LAMBDA_ENDPOINT = 'https://lambda.{region}.amazonaws.com/2015-03-31/functions'
AWS_CREDENTIALS = session.Session().get_credentials()


def sign_headers(*, url: str, payload: Dict):
    '''Sign AWS API request headers'''
    segments = urllib.parse.urlparse(url).netloc.split('.')
    service = segments[0]
    region = segments[1]

    request = awsrequest.AWSRequest(
        method='POST',
        url=url,
        data=json.dumps(payload),
    )

    auth.SigV4Auth(AWS_CREDENTIALS, service, region).add_auth(request)

    return dict(request.headers.items())


async def invoke(*, url: str, payload: Dict, session):
    '''Invoke a Lambda function'''
    signed_headers = sign_headers(url=url, payload=payload)

    async with session.post(url, json=payload, headers=signed_headers) \
            as response:
        return await response.json()


def run_invocations(
        *,
        requests: List,
        base_url: str,
        session,
        async: bool,
        ):
    for request in requests:
        method = 'invoke-async' if async is True else 'invocations'

        url = os.path.join(base_url, request['function_name'], method)

        yield invoke(url=url, payload=request['payload'], session=session)


def invoke_all(
        *,
        requests: List,
        region: str = 'us-east-1',
        async: bool = False,
        ):
    base_url = LAMBDA_ENDPOINT.format(region=region)

    async def wrapper():
        async with aiohttp.ClientSession(raise_for_status=True) as session:
            invocations = run_invocations(
                requests=requests,
                base_url=base_url,
                session=session,
                async=async,
            )

            return await asyncio.gather(*invocations)

    loop = asyncio.get_event_loop()

    results = loop.run_until_complete(wrapper())

    return results

LICENSE

The code in this gist (async_lambda.py) is licensed under the following terms:

MIT License

Copyright (c) 2019 Renato Byrro

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

requirements.txt

boto3>=1.9.183
aiohttp>=3.5.4

Hi i am new in python so can you explain me how i install the xlibs ? pip shows me an xlib library but not an xlibs.
from xlibs import constants
thanks in advance

Hi i am new in python so can you explain me how i install the xlibs ? pip shows me an xlib library but not an xlibs.
from xlibs import constants
thanks in advance

Hi @Zafer83, I cleaned it up. I actually had this script in another project and forgot to remove this import when I extracted as a gist. Sorry about that, it's fixed now. Thanks for pointing it out!