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handler.py
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handler.py
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import sys
# Import local dependencies
sys.path.append('./site-packages')
import os
from pprint import pprint
import traceback
import json
import boto3
from botocore.exceptions import ClientError
ALL_INSTANCES_NAME = "@all"
def get_filter_tag():
tag = os.environ['EC2_FILTER_TAG']
return tag
def get_monitor_tag():
tag = os.environ['EC2_MONITOR_TAG']
return tag
def get_monitor_email():
email = os.environ['EC2_EMAIL']
return email
def get_monitor_email_prefix():
prefix = os.environ['EC2_EMAIL_PREFIX']
return prefix
def send_email(client, email, subject, body):
response = client.send_email(
Destination={
'ToAddresses': [
email,
],
},
Message={
'Body': {
'Html': {
'Charset': 'UTF-8',
'Data': body,
},
'Text': {
'Charset': 'UTF-8',
'Data': body,
},
},
'Subject': {
'Charset': 'UTF-8',
'Data': subject,
},
},
ReplyToAddresses=[
],
Source=email,
)
return response
def get_monitor_instances(client, event):
"""Return a list of instances based on the monitor tag in serverles.yml"""
instance_names = []
error_message = None
filter_tag = get_monitor_tag()
r = client.describe_instances(
Filters=[
{'Name':'tag-key', 'Values':[filter_tag]}
]
)
# AWS' boto3 api involves a lot of looping
if len(r['Reservations']) > 0:
for res in r['Reservations']:
for ins in res['Instances']:
ins_id = ins['InstanceId']
ins_state = ins['State']['Name']
if ins_state == "running":
tags = ins['Tags']
for tag in tags:
if tag['Key'] == "Name":
instance_names.append( tag['Value'] )
else:
error_message = 'Unable to find instances'
print(error_message, instance_names)
return (error_message, instance_names)
def is_get_all_instances(event):
"""Check if the request is to apply the action to all
'@all' is the reserved instance name"""
instance_name = None
# Get the instance name from the path
try:
instance_name = event['pathParameters']['name']
print( 'Instance Name: %s' % instance_name)
except:
instance_name = None
return (instance_name == ALL_INSTANCES_NAME)
def get_instances(client, event):
"""Return a list of instances based on the filter tag in serverless.yml"""
instance_names = []
error_message = None
filter_tag = get_filter_tag()
r = client.describe_instances(
Filters=[
{'Name':'tag-key', 'Values':[filter_tag]}
]
)
# AWS' boto3 api involves a lot of looping
if len(r['Reservations']) > 0:
for res in r['Reservations']:
for ins in res['Instances']:
ins_id = ins['InstanceId']
tags = ins['Tags']
for tag in tags:
if tag['Key'] == "Name":
instance_names.append( tag['Value'] )
else:
error_message = 'Unable to find instances'
print(error_message, instance_names)
return (error_message, instance_names)
def get_instances_status(client, event):
"""Return a list of instances' status based on the filter tag in serverles.yml"""
instances = []
error_message = None
filter_tag = get_filter_tag()
r = client.describe_instances(
Filters=[
{'Name':'tag-key', 'Values':[filter_tag]}
]
)
# AWS' boto3 api involves a lot of looping
if len(r['Reservations']) > 0:
for res in r['Reservations']:
for ins in res['Instances']:
ins_id = ins['InstanceId']
ins_state = ins['State']['Name']
tags = ins['Tags']
for tag in tags:
if tag['Key'] == "Name":
instances.append({
'name': tag['Value'],
'id': ins_id,
'state': ins_state
})
else:
error_message = 'Unable to find instances'
print(error_message, instances)
return (error_message, instances)
def get_instance(client, event):
"""Find an instance's id and status based on the Name tag given to it.
Assumes the name tag is unique. if not, will pick the first"""
instance_name = None
instance = None
error_message = None
filter_tag = get_filter_tag()
# Get the instance name from the path
try:
instance_name = event['pathParameters']['name']
print( 'Instance Name: %s' % instance_name)
except:
instance_name = None
if instance_name:
r = client.describe_instances(
Filters=[
{'Name':'tag:Name', 'Values': [instance_name]},
{'Name':'tag-key', 'Values':[filter_tag]}
]
)
# AWS' boto3 api involves a lot of looping
if len(r['Reservations']) > 0:
for res in r['Reservations']:
for ins in res['Instances']:
ins_id = ins['InstanceId']
ins_state = ins['State']['Name']
if ins_state in ('shutting-down', 'terminated'):
error_message = 'No action taken. Instance %s is %s' % (ins_id, ins_state)
else:
instance = {
'name': instance_name,
'id': ins_id,
'state': ins_state
}
break
else:
error_message = 'Unable to find instance with tag:Name - %s' % instance_name
else:
error_message = 'No instance name specified'
print(error_message, instance)
return (error_message, instance)
def ec2_monitor(event, context):
"""Send an email with list of running instances"""
body = {}
status_code = 200
try:
client = boto3.client('ec2')
# Find the instances
error, instance_names = get_monitor_instances(client, event)
prefix = get_monitor_email_prefix()
message = prefix + " Running ec2 instances: %s" % (", ".join(instance_names))
print(message)
if error:
body["error"] = error
else:
if len(instance_names) > 0:
email = get_monitor_email()
eclient = boto3.client('ses')
response = send_email(eclient, email, message, message)
body["message"] = response
else:
body["message"] = message
except Exception as e:
print(traceback.format_exc())
status_code = 500
body["error"] = str(e)
response = {
"statusCode": status_code,
"body": json.dumps(body)
}
return response
def ec2_list(event, context):
"""Return a list of instances based on the tag in serverles.yml"""
body = {}
status_code = 200
try:
client = boto3.client('ec2')
# Find the instances
error, instance_names = get_instances(client, event)
if error:
body["error"] = error
else:
# Add only if no error
instance_names.append(ALL_INSTANCES_NAME)
body["message"] = instance_names
except Exception as e:
print(traceback.format_exc())
status_code = 500
body["error"] = str(e)
response = {
"statusCode": status_code,
"body": json.dumps(body)
}
return response
def ec2_status(event, context):
"""Return the status of the instance requested"""
body = {}
status_code = 200
try:
client = boto3.client('ec2')
if is_get_all_instances(event):
# Check all instances
error, instances = get_instances_status(client, event)
if error:
body["error"] = error
else:
body["message"] = instances
else:
# Find the instance
error, instance = get_instance(client, event)
if error:
body["error"] = error
else:
body["message"] = [instance]
except Exception as e:
print(traceback.format_exc())
status_code = 500
body["error"] = str(e)
response = {
"statusCode": status_code,
"body": json.dumps(body)
}
return response
def ec2_start(event, context):
"""Start an instance by its tag:Name via an API call"""
body = {}
status_code = 200
try:
client = boto3.client('ec2')
# Find the instance
error, instance = get_instance(client, event)
instance_id = instance.get('name')
if error:
body["message"] = error
else:
# Start the instance
r = client.start_instances(InstanceIds=[instance.get('id')])
if len(r['StartingInstances']) > 0:
instance['state'] = r['StartingInstances'][0]['CurrentState']['Name']
body["message"] = [instance]
else:
status_code = 500
body["error"] = 'Unable to start: ' + str(instance_id) + ' ' + str(instance_state)
except Exception as e:
print(traceback.format_exc())
status_code = 500
body["error"] = str(e)
response = {
"statusCode": status_code,
"body": json.dumps(body)
}
return response
def ec2_stop(event, context):
""""Stop an instance by its tag:Name via an API call"""
body = {}
status_code = 200
try:
# Get the instance name from the path
client = boto3.client('ec2')
# Find the instance
error, instance = get_instance(client, event)
if error:
body["error"] = error
else:
# Stop the instance
r = client.stop_instances(InstanceIds=[instance.get('id')])
if len(r['StoppingInstances']) > 0:
instance['state'] = r['StoppingInstances'][0]['CurrentState']['Name']
body["message"] = [instance]
else:
status_code = 500
body["error"] = 'Unable to stop: ' + str(instance_id) + ' ' + str(instance_state)
except Exception as e:
print(traceback.format_exc())
status_code = 500
body["error"] = str(e)
response = {
"statusCode": status_code,
"body": json.dumps(body)
}
return response