Initialise NASA Client

nasa_client.py

import boto3
from boto3.session import Session

MARS_DATA_ROLE_ARN = "arn:aws:iam::9999999999:role/SecretMarsDataReadOnlyRole" # role ARN shared with us
DEFAULT_ROLE_SESSION_NAME = "mars-data-access-role-session"

def get_nasa_data_client():
  client = boto3.client('sts')
  response = client.assume_role(RoleArn=MARS_DATA_ROLE_ARN, RoleSessionName=DEFAULT_ROLE_SESSION_NAME)
  
  session = Session(aws_access_key_id=response['Credentials']['AccessKeyId'],
                    aws_secret_access_key=response['Credentials']['SecretAccessKey'],
                    aws_session_token=response['Credentials']['SessionToken'])
  # client with permission to access NASA's table
  return session.client('dynamodb')