在 lambda 超时之前，如何为运行时间更长的进程返回对 AWS lambda function 的响应？

Question

I have a s3 bucket trigger set up to call a lambda function when a new file is saved to the bucket. That lambda function then parses the event data and sends it as a post request to an api running on on ec2 instance. That post request, when received starts a file conversion pipeline process that can take a minute or so to run. The lambda seems to time-out every 3 seconds, so it keeps trying and then saying 'timed out' because it never receives a response from the api call. The actual conversion process kicks off and completes just fine though so thats not an issue but I didn't think this was good practice. Is there a fix to this or some other way I should be configuring this?

My lambda function is

import json
import requests

def lambda_handler(event, context):
    # Get the bucket name and object key from the event
    bucket_name = event['Records'][0]['s3']['bucket']['name']
    object_key = event['Records'][0]['s3']['object']['key']

    # Encode the data as JSON
    data = {
        'bucket_name': bucket_name,
        'object_key': object_key
    }
    json_data = json.dumps(data)

    # Make the POST request
    url = "http://<domain>/api/new/file"
    headers = {
        'Content-Type': 'application/json'
    }
    response = requests.request("POST", url, headers=headers, data=json_data)
    
    # Return the response status code
    print(f'response code: {response}')
    # return response.status_code
    print(data)
    return data

The api on the ec2 instance is:

from flask import Flask, request

app = Flask(__name__)

@app.route('/api/new/file', methods=['POST'])
def handle_request():
    
    content_type = request.headers.get('Content-Type')
    if (content_type == 'application/json'):
        data = request.json
        file_name = os.path.basename(data['object_key'])
    
        try:
            <my_long_function>(file_name)
        except Exception as e:
                print(e)
                return "False"
        return "True"
    else:
        return 'Content-Type not supported!'

Answer 1

That's because lambda by default runs for 3 secs. All you have to do is increase the timeout value, which can be up to 15 mins == 900 secs Lambda > Configuration > General Configuration > Timeout