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nivleshc / cfn-amazon-connect-create-lambda-dynamodbTable.yml
Created Oct 10, 2019
This AWS CloudFormation template deploys an Amazon DynamoDB Table and two AWS Lambda functions. These will be used by the Amazon Connect instance.
View cfn-amazon-connect-create-lambda-dynamodbTable.yml
AWSTemplateFormatVersion: "2010-09-09"
Description: Template for deploying Amazon DynamoDB and AWS Lambda functions that will be used by the Amazon Connect instance
Description: Name of the Amazon DynamoDB Table that will be created to store phone numbers for approved callers to Amazon Connect
Type: String
Default: amzn-connect-authorisedUsers
Description: Billing mode to be used for authorisedUsers Amazon DynamoDB Table
nivleshc /
Last active Oct 9, 2019
This is the code for an AWS Lambda function. Amazon SES will invoke this lambda function to manage Amazon EC2 instances
import boto3
def provideHelp(params):
message = "Set the subject of the email to one of the following\n"
message += "help - provides this help\n"
message += "status - provides the status of all ec2 instances in the region\n"
message += "start {instance-id} - starts the ec2 instance with with the specified instance-id\n"
message += "stop {instance-id} - stops the ec2 instance with the specified instance id"
return message
#this script will query OpenData API to get the current positions for Sydney Trains. It will then use this information to plot the
#positions on a map
from google.transit import gtfs_realtime_pb2
import requests
import datetime
import boto3
import os
import time
from pytz import timezone
def run(event, context):
print(, 'Started')
today =
#loop through each operator and get their vehicle positions
for operator in operators:
callOpenData(operator, feed)
def update_pushpinLabelsTable(tripdate):
global lastpushpinLabel
#update the pushpinLabels dynamodb table with all the pushpinLabels that were created in this invocation
print("update_pushpinLabelsTable:Uploading new pushpinLabels to dynamodb Table")
time_now = #each item uploaded to dynamodb table will have the time it was inserted
time_now_str = time_now.strftime("%Y-%m-%d %H:%M:%S")
epoch_time_now = time_now.timestamp()
expirationTime = int(epoch_time_now + (dynamodb_item_expiry_in_days * 24 * 3600)) #convert expiry days to seconds
print("update_pushpinLabelsTable:time_now:", time_now_str," epoch_time_now:", epoch_time_now, " expirationTime:", expirationTime)
num_items_added_to_dynamodb = 0
def generate_vehicle_position_webpage(map_url, body, s3Bucket, s3ImageKey, imagefilename, mainHtmlfilename, today):
global dict_pushpinLabel_to_desc_map
global dict_vehicleId_to_pushpinLabel_map
global lastpushpinLabel
global total_vehicles_found
#get a handle on the s3 bucket
s3 = boto3.resource('s3')
imgObject = s3.Object(s3Bucket,s3ImageKey+imagefilename)
map_webrequest =, data=body)
def process_feed(feed, today):
global dict_pushpinLabel_to_desc_map
global dict_vehicleId_to_pushpinLabel_map
global lastpushpinLabel
global pushpin_url
global total_vehicles_found
#we will use the python module 'time' to convert epoch time (this is what gtfsr timestamps are in) to local time
#set the timezone for time
os.environ['TZ'] = 'AEST-10AEDT-11,M10.5.0,M3.5.0'
def callOpenData(operator, feed):
print("callOpenData:Obtaining vehicle location for", operator,end="...")
response = requests.get(baseURL + operator, headers=headers)
#read the contents ot pushpinLabelsTable and populate pushpinLabels_LabelNum and pushpinLabels_Label dict
def load_pushpinLabels_from_dynamodb(today):
global dict_pushpinLabel_to_desc_map
global dict_vehicleId_to_pushpinLabel_map
global lastpushpinLabel
rdate = today.strftime("%Y-%m-%d")
pushpinLabelsTableContents = pushpinLabelsTable.query(
KeyConditionExpression='TripDate = :tripdate',
#most of the times, lambda functions get re-used by AWS for consequetive runs. To ensure the global variables are sanitised and do not
#cause issues because they contain values from last run, we will initialise them
def initialise_global_variables():
global lastpushpinLabel
global dict_pushpinLabel_to_desc_map
global dict_vehicleId_to_pushpinLabel_map
global pushpin_url
global total_vehicles_found
#initialise the values for the above global variables
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