Import Query String from AWS API Gateway into Lambda Python Function

Question

I am working on creating a Lambda Function which imports query string information into a database but I'm running into some trouble accessing the query string itself in my python code. I have setup the proper string variables within the API Gateway and also enabled Lambda Proxy integration from the Integration Request section.

Some articles and previous responses said I should be doing so by using:

event["queryStringParameters"]['querystring1']

I've setup a handler and I'm curious how to pass the request body into the function my_handler

Here's a snippet of the code:

import logging, traceback, os

#environment variables
ep = os.environ["EP"]
p = os.environ["PORT"]
du = os.environ["USER"]
pw = os.environ["PASSWORD"]
db = os.environ["DATABASE"]

#query string variables
def my_handler(event):
    servername = event["queryStringParameters"]["servername"]
    hostDesc = event["queryStringParameters"]["description"]
    hostRegion = event["queryStringParameters"]["region"]
    response = servername + hostDesc + hostRegion
    return { 
        'status code' : 200,
        'body' : json.dumps(response)
    } 

Answer 1

This was due to an error.

I was trying to pass a SQL query later in the script via a global string by attempting to use the handler results. What should be done is defining the query as a function and call it during the handler. Once the handler has the event variables from the body request, they can be passed into the function.

EX:

import logging, traceback, json

def query(hostServername, hostDesc, hostRegion):
    return "SELECT * FROM TABLE_NAME WHERE host ='"+hostIP+"' AND '"+hostPort+"' AND '"+hostServername+"'"

#query string variables
def my_handler(event):
    server = event["queryStringParameters"]["servername"]
    host = event["queryStringParameters"]["description"]
    region = event["queryStringParameters"]["region"]
    try:
        cnx = some_database_connect_function()
        cursor=cnx.cursor()

        try:
            cursor.execute(query(server, host, region))
            return{
            'Status Code' : 200
            }
        except:
            return log_err ("ERROR: Cannot execute cursor.\n{}".format(
                traceback.format_exc()) )

    except:
        return log_err("ERROR: Cannot connect to database from handler.\n{}".format(
            traceback.format_exc()))