get_instance_name.py

import logging

import boto3
from botocore.exceptions import ClientError, BotoCoreError
import requests
from requests import RequestException


def get_instance_name():
  try:
    r = requests.get("http://169.254.169.254/latest/dynamic/instance-identity/document")
    r.raise_for_status()
  except RequestException as e:
    logging.exception(e)
    return None

  try:
    response_json = r.json()
  except ValueError as e:
    logging.exception(e)
    return None

  region = response_json.get('region')
  instance_id = response_json.get('instanceId')

  if not (region and instance_id):
    logging.error('Invalid region: {} or instance_id: {}'.format(region, instance_id))
    return None

  try:
    ec2 = boto3.resource('ec2', region_name=region)
    instance = ec2.Instance(instance_id)
    tags = instance.tags
  except (ValueError, ClientError, BotoCoreError) as e:
    logging.exception(e)
    return None

  tags = tags or []
  names = [tag.get('Value') for tag in tags if tag.get('Key') == 'Name']
  name = names[0] if names else None
  return name