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May 21, 2020 17:18
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import json | |
import shlex | |
import urllib | |
import urllib2 | |
import slack | |
import boto3 | |
import re | |
from itertools import groupby | |
# Mapping CloudFormation status codes to colors for Slack message attachments | |
# Status codes from http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-describing-stacks.html | |
STATUS_COLORS = { | |
'CREATE_COMPLETE': 'good', | |
'CREATE_IN_PROGRESS': 'good', | |
'CREATE_FAILED': 'danger', | |
'DELETE_COMPLETE': 'good', | |
'DELETE_FAILED': 'danger', | |
'DELETE_IN_PROGRESS': 'good', | |
'ROLLBACK_COMPLETE': 'warning', | |
'ROLLBACK_FAILED': 'danger', | |
'ROLLBACK_IN_PROGRESS': 'warning', | |
'UPDATE_COMPLETE': 'good', | |
'UPDATE_COMPLETE_CLEANUP_IN_PROGRESS': 'good', | |
'UPDATE_IN_PROGRESS': 'good', | |
'UPDATE_ROLLBACK_COMPLETE': 'warning', | |
'UPDATE_ROLLBACK_COMPLETE_CLEANUP_IN_PROGRESS': 'warning', | |
'UPDATE_ROLLBACK_FAILED': 'danger', | |
'UPDATE_ROLLBACK_IN_PROGRESS': 'warning' | |
} | |
# List of CloudFormation status that will trigger a call to `get_stack_summary_attachment` | |
DESCRIBE_STACK_STATUS = [ | |
'CREATE_COMPLETE', | |
'DELETE_IN_PROGRESS' | |
] | |
# List of properties from ths SNS message that will be included in a Slack message | |
SNS_PROPERTIES_FOR_SLACK = [ | |
'Timestamp', | |
'StackName', | |
] | |
def lambda_handler(event, context): | |
message = event['Records'][0]['Sns'] | |
sns_message = message['Message'] | |
cf_message = dict(token.split('=', 1) for token in shlex.split(sns_message)) | |
# ignore messages that do not pertain to the Stack as a whole | |
if not cf_message['ResourceType'] == 'AWS::CloudFormation::Stack': | |
return | |
message = get_stack_update_message(cf_message) | |
data = json.dumps(message) | |
req = urllib2.Request(slack.WEBHOOK, data, {'Content-Type': 'application/json'}) | |
urllib2.urlopen(req) | |
def get_tags_as_dict(tags): | |
"""Convert AWS tags array into a nicer format for use""" | |
return { i["Key"]: i["Value"] for i in tags } | |
def get_stack_update_message(cf_message): | |
attachments = [ | |
get_stack_update_attachment(cf_message) | |
] | |
if cf_message['ResourceStatus'] in DESCRIBE_STACK_STATUS: | |
attachments.append(get_stack_summary_attachment(cf_message['StackName'])) | |
stack_url = get_stack_url(cf_message['StackId']) | |
# Default to the incoming stack name | |
stack_name = cf_message['StackName'] | |
# If we have a tags section, use that info | |
if cf_message['ResourceProperties'] and cf_message['ResourceProperties']['Tags']: | |
tags = get_tags_as_dict(cf_message['ResourceProperties']['Tags']) | |
if 'empire.app.release' in tags: | |
stack_name = "{name} ({version})".format( | |
name=stack_name, | |
version=tags['empire.app.release'] | |
) | |
message = { | |
'icon_emoji': ':cloud:', | |
'username': 'cf-bot', | |
'text': 'Stack: {stack} has entered status: {status} <{link}|(view in web console)>'.format( | |
stack=stack_name status=cf_message['ResourceStatus'], link=stack_url), | |
'attachments': attachments | |
} | |
channel = get_channel(cf_message['StackName']) | |
if channel: | |
message['channel'] = channel | |
return message | |
def get_channel(stack_name): | |
default = slack.CHANNEL if hasattr(slack, 'CHANNEL') else None | |
if hasattr(slack, 'CUSTOM_CHANNELS'): | |
return slack.CUSTOM_CHANNELS.get(stack_name, default) | |
return default | |
def get_stack_update_attachment(cf_message): | |
title = 'Stack {stack} is now status {status}'.format( | |
stack=cf_message['StackName'], | |
status=cf_message['ResourceStatus']) | |
return { | |
'fallback': title, | |
'title': title, | |
'fields': [{'title': k, 'value': v, 'short': True} | |
for k, v in cf_message.iteritems() if k in SNS_PROPERTIES_FOR_SLACK], | |
'color': STATUS_COLORS.get(cf_message['ResourceStatus'], '#000000'), | |
} | |
def get_stack_summary_attachment(stack_name): | |
client = boto3.client('cloudformation') | |
resources = client.describe_stack_resources(StackName=stack_name) | |
sorted_resources = sorted(resources['StackResources'], key=lambda res: res['ResourceType']) | |
grouped_resources = groupby(sorted_resources, lambda res: res['ResourceType']) | |
resource_count = {key: len(list(group)) for key, group in grouped_resources} | |
title = 'Breakdown of all {} resources'.format(len(resources['StackResources'])) | |
return { | |
'fallback': title, | |
'title': title, | |
'fields': [{'title': 'Type {}'.format(k), 'value': 'Total {}'.format(v), 'short': True} | |
for k, v in resource_count.iteritems()] | |
} | |
def get_stack_region(stack_id): | |
regex = re.compile('arn:aws:cloudformation:(?P<region>[a-z]{2}-[a-z]{4,9}-[1-3]{1})') | |
return regex.match(stack_id).group('region') | |
def get_stack_url(stack_id): | |
region = get_stack_region(stack_id) | |
query = { | |
'filter': 'active', | |
'tab': 'events', | |
'stackId': stack_id | |
} | |
return ('https://{region}.console.aws.amazon.com/cloudformation/home?region={region}#/stacks?{query}' | |
.format(region=region, query=urllib.urlencode(query))) |
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