How to get a Terraform object into an AWS Lambda environment

Question

Lambda functions support the environment parameter and make it easy to define a key-value pair. But what about getting an object (defined by a module variable eg) into the function's environment?

Quick example of what I'm trying to accomplish in python 3.7:

Terraform:

# variable definition

variable foo {
  type = map(any)
  default = {
    a = "b"
    c = "d"
  }
}


resource "aws_lambda_function" "lambda" {
  .
  .
  .
  environment {
    foo = jsonencode(foo)
  }
}

and then in my function:

def bar:
  for k in os.environ["foo"]:
     print(k)

Thanks !

The task is currently on hold, I'll definitely make an update once i start working on it and find a solution! — Dragon B
– Dragon B, Commented Jan 17, 2022 at 10:49

Marcin · Accepted Answer · 2022-01-14 08:52:56Z

5

In python, you will have to get json string and convert it to dict:

import json

def bar:
  for k in json.loads(os.environ["foo"]):
     print(k)

answered Jan 14, 2022 at 8:52

Marcin

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Comments

Dmitrii Kalashnikov · Accepted Answer · 2022-02-01 10:31:46Z

0

Same question

resource "aws_lambda_function" "test_lambda" {
  filename      = var.filename
  function_name = var.function_name
  role          = var.iam_lambda
  handler       = "lambda_handler"
  source_code_hash = filebase64sha256("lambda_function.zip")

  runtime = "python3.9"

  environment {
    variables = {
      instances = "${var.instances}",
      region = "us-east-2"
    }
  }
}

lambda_function.zip

import boto3
region = 'region'
instances = ['i-092222222222', 'i-00433333333','i-09b24444444444']
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
    ec2.start_instances(InstanceIds=instances)
    print('started your instances: ' + str(instances))

How correct define the variables in Python code?

I found a more elegant solution here

edited Feb 1, 2022 at 10:31

answered Jan 28, 2022 at 13:35

Dmitrii Kalashnikov

1071 silver badge9 bronze badges

2 Comments

Dragon B Over a year ago

They're placed into the runtime environment by the terraform's environment and have to be pulled from the environment by python's os.environ Also, terraform should jsonencode and python should json.loads them. Read the answer

Dmitrii Kalashnikov Over a year ago

Thank you, but an example will be very helpful.

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