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Copy pathaws_lambda.py
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executable file
·351 lines (275 loc) · 12 KB
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# -*- coding: utf-8 -*-
from __future__ import print_function
import json
import logging
import os
import time
from imp import load_source
from shutil import copy, copyfile
from tempfile import mkdtemp
import botocore
import boto3
import pip
import yaml
from .helpers import mkdir, read, archive, timestamp
log = logging.getLogger(__name__)
def cleanup_old_versions(src, keep_last_versions):
"""Deletes old deployed versions of the function in AWS Lambda.
Won't delete $Latest and any aliased version
:param str src:
The path to your Lambda ready project (folder must contain a valid
config.yaml and handler module (e.g.: service.py).
:param int keep_last_versions:
The number of recent versions to keep and not delete
"""
if keep_last_versions <= 0:
print("Won't delete all versions. Please do this manually")
else:
path_to_config_file = os.path.join(src, 'config.yaml')
cfg = read(path_to_config_file, loader=yaml.load)
aws_access_key_id = cfg.get('aws_access_key_id')
aws_secret_access_key = cfg.get('aws_secret_access_key')
client = get_client('lambda', aws_access_key_id, aws_secret_access_key,
cfg.get('region'))
response = client.list_versions_by_function(
FunctionName=cfg.get("function_name")
)
versions = response.get("Versions")
if len(response.get("Versions")) < keep_last_versions:
print("Nothing to delete. (Too few versions published)")
else:
version_numbers = [elem.get("Version") for elem in
versions[1:-keep_last_versions]]
for version_number in version_numbers:
try:
client.delete_function(
FunctionName=cfg.get("function_name"),
Qualifier=version_number
)
except botocore.exceptions.ClientError as e:
print("Skipping Version {}: {}".format(version_number,
e.message))
def deploy(src, local_package=None):
"""Deploys a new function to AWS Lambda.
:param str src:
The path to your Lambda ready project (folder must contain a valid
config.yaml and handler module (e.g.: service.py).
:param str local_package:
The path to a local package with should be included in the deploy as
well (and/or is not available on PyPi)
"""
# Load and parse the config file.
path_to_config_file = os.path.join(src, 'config.yaml')
cfg = read(path_to_config_file, loader=yaml.load)
# Copy all the pip dependencies required to run your code into a temporary
# folder then add the handler file in the root of this directory.
# Zip the contents of this folder into a single file and output to the dist
# directory.
path_to_zip_file = build(src, local_package)
if function_exists(cfg, cfg.get('function_name')):
update_function(cfg, path_to_zip_file)
else:
create_function(cfg, path_to_zip_file)
def invoke(src, alt_event=None, verbose=False):
"""Simulates a call to your function.
:param str src:
The path to your Lambda ready project (folder must contain a valid
config.yaml and handler module (e.g.: service.py).
:param str alt_event:
An optional argument to override which event file to use.
:param bool verbose:
Whether to print out verbose details.
"""
# Load and parse the config file.
path_to_config_file = os.path.join(src, 'config.yaml')
cfg = read(path_to_config_file, loader=yaml.load)
# Load and parse event file.
if alt_event:
path_to_event_file = os.path.join(src, alt_event)
else:
path_to_event_file = os.path.join(src, 'event.json')
event = read(path_to_event_file, loader=json.loads)
handler = cfg.get('handler')
# Inspect the handler string (<module>.<function name>) and translate it
# into a function we can execute.
fn = get_callable_handler_function(src, handler)
# TODO: look into mocking the ``context`` variable, currently being passed
# as None.
start = time.time()
results = fn(event, None)
end = time.time()
print("{0}".format(results))
if verbose:
print("\nexecution time: {:.8f}s\nfunction execution "
"timeout: {:2}s".format(end - start, cfg.get('timeout', 15)))
def init(src, minimal=False):
"""Copies template files to a given directory.
:param str src:
The path to output the template lambda project files.
:param bool minimal:
Minimal possible template files (excludes event.json).
"""
templates_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),
"project_templates")
for filename in os.listdir(templates_path):
if (minimal and filename == 'event.json') or filename.endswith('.pyc'):
continue
destination = os.path.join(templates_path, filename)
copy(destination, src)
def build(src, local_package=None):
"""Builds the file bundle.
:param str src:
The path to your Lambda ready project (folder must contain a valid
config.yaml and handler module (e.g.: service.py).
:param str local_package:
The path to a local package with should be included in the deploy as
well (and/or is not available on PyPi)
"""
# Load and parse the config file.
path_to_config_file = os.path.join(src, 'config.yaml')
cfg = read(path_to_config_file, loader=yaml.load)
# Get the absolute path to the output directory and create it if it doesn't
# already exist.
dist_directory = cfg.get('dist_directory', 'dist')
path_to_dist = os.path.join(src, dist_directory)
mkdir(path_to_dist)
# Combine the name of the Lambda function with the current timestamp to use
# for the output filename.
function_name = cfg.get('function_name')
output_filename = "{0}-{1}.zip".format(timestamp(), function_name)
path_to_temp = mkdtemp(prefix='aws-lambda')
pip_install_to_target(path_to_temp, local_package)
# Gracefully handle whether ".zip" was included in the filename or not.
output_filename = ('{0}.zip'.format(output_filename)
if not output_filename.endswith('.zip')
else output_filename)
files = []
for filename in os.listdir(src):
if os.path.isfile(filename):
if filename == '.DS_Store':
continue
if filename == 'config.yaml':
continue
files.append(os.path.join(src, filename))
# "cd" into `temp_path` directory.
os.chdir(path_to_temp)
for f in files:
_, filename = os.path.split(f)
# Copy handler file into root of the packages folder.
copyfile(f, os.path.join(path_to_temp, filename))
# Zip them together into a single file.
# TODO: Delete temp directory created once the archive has been compiled.
path_to_zip_file = archive('./', path_to_dist, output_filename)
return path_to_zip_file
def get_callable_handler_function(src, handler):
"""Tranlate a string of the form "module.function" into a callable
function.
:param str src:
The path to your Lambda project containing a valid handler file.
:param str handler:
A dot delimited string representing the `<module>.<function name>`.
"""
# "cd" into `src` directory.
os.chdir(src)
module_name, function_name = handler.split('.')
filename = get_handler_filename(handler)
path_to_module_file = os.path.join(src, filename)
module = load_source(module_name, path_to_module_file)
return getattr(module, function_name)
def get_handler_filename(handler):
"""Shortcut to get the filename from the handler string.
:param str handler:
A dot delimited string representing the `<module>.<function name>`.
"""
module_name, _ = handler.split('.')
return '{0}.py'.format(module_name)
def pip_install_to_target(path, local_package=None):
"""For a given active virtualenv, gather all installed pip packages then
copy (re-install) them to the path provided.
:param str path:
Path to copy installed pip packages to.
:param str local_package:
The path to a local package with should be included in the deploy as
well (and/or is not available on PyPi)
"""
print('Gathering pip packages')
for r in pip.operations.freeze.freeze():
if r.startswith('Python=='):
# For some reason Python is coming up in pip freeze.
continue
elif r.startswith('-e '):
r = r.replace('-e ','')
print('Installing {package}'.format(package=r))
pip.main(['install', r, '-t', path, '--ignore-installed'])
if local_package is not None:
pip.main(['install', local_package, '-t', path])
def get_role_name(account_id, role):
"""Shortcut to insert the `account_id` and `role` into the iam string."""
return "arn:aws:iam::{0}:role/{1}".format(account_id, role)
def get_account_id(aws_access_key_id, aws_secret_access_key):
"""Query IAM for a users' account_id"""
client = get_client('iam', aws_access_key_id, aws_secret_access_key)
return client.get_user()['User']['Arn'].split(':')[4]
def get_client(client, aws_access_key_id, aws_secret_access_key, region=None):
"""Shortcut for getting an initialized instance of the boto3 client."""
return boto3.client(
client,
aws_access_key_id=aws_access_key_id,
aws_secret_access_key=aws_secret_access_key,
region_name=region
)
def create_function(cfg, path_to_zip_file):
"""Register and upload a function to AWS Lambda."""
print("Creating your new Lambda function")
byte_stream = read(path_to_zip_file)
aws_access_key_id = cfg.get('aws_access_key_id')
aws_secret_access_key = cfg.get('aws_secret_access_key')
account_id = get_account_id(aws_access_key_id, aws_secret_access_key)
role = get_role_name(account_id, cfg.get('role', 'lambda_basic_execution'))
client = get_client('lambda', aws_access_key_id, aws_secret_access_key,
cfg.get('region'))
client.create_function(
FunctionName=cfg.get('function_name'),
Runtime=cfg.get('runtime', 'python2.7'),
Role=role,
Handler=cfg.get('handler'),
Code={'ZipFile': byte_stream},
Description=cfg.get('description'),
Timeout=cfg.get('timeout', 15),
MemorySize=cfg.get('memory_size', 512),
Publish=True
)
def update_function(cfg, path_to_zip_file):
"""Updates the code of an existing Lambda function"""
print("Updating your Lambda function")
byte_stream = read(path_to_zip_file)
aws_access_key_id = cfg.get('aws_access_key_id')
aws_secret_access_key = cfg.get('aws_secret_access_key')
account_id = get_account_id(aws_access_key_id, aws_secret_access_key)
role = get_role_name(account_id, cfg.get('role', 'lambda_basic_execution'))
client = get_client('lambda', aws_access_key_id, aws_secret_access_key,
cfg.get('region'))
client.update_function_code(
FunctionName=cfg.get('function_name'),
ZipFile=byte_stream,
Publish=True
)
client.update_function_configuration(
FunctionName=cfg.get('function_name'),
Role=role,
Handler=cfg.get('handler'),
Description=cfg.get('description'),
Timeout=cfg.get('timeout', 15),
MemorySize=cfg.get('memory_size', 512)
)
def function_exists(cfg, function_name):
"""Check whether a function exists or not"""
aws_access_key_id = cfg.get('aws_access_key_id')
aws_secret_access_key = cfg.get('aws_secret_access_key')
client = get_client('lambda', aws_access_key_id, aws_secret_access_key,
cfg.get('region'))
functions = client.list_functions().get('Functions', [])
for fn in functions:
if fn.get('FunctionName') == function_name:
return True
return False