import json
from botocore.vendored import requests
import boto3
import time

region = 'xx-xxxx-x'
instances = ['x-xxxxxxxxxxxx']
website = 'https://website.com/'
webstring = 'SearchText'

def lambda_handler(event, context):
    for i in range(0,3):
        if check_website():
            return 'Website OK'
        time.sleep(60)
    reboot_instance()
    return 'Restarted instances'


def check_website():
    r = requests.get(website)
    if webstring in r.text:
        return True
    else:
        return False

def reboot_instance():
    ec2 = boto3.client('ec2', region_name=region)
    ec2.reboot_instances(InstanceIds=instances)