Repository navigation
Expand file tree
/
Copy pathaws_lambda.py
More file actions
executable file
·279 lines (214 loc) · 9.04 KB
/
Copy pathaws_lambda.py
File metadata and controls
executable file
·279 lines (214 loc) · 9.04 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
# -*- 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 boto3
import pip
import yaml
from . import project_template
from .helpers import mkdir, read, archive, timestamp
log = logging.getLogger(__name__)
def deploy(src):
"""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).
"""
# 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.
path_to_dist = os.path.join(src, 'dist')
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)
# 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, path_to_dist, output_filename)
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).
"""
path_to_project_template = project_template.__path__[0]
for f in os.listdir(path_to_project_template):
path_to_file = os.path.join(path_to_project_template, f)
if minimal and f == 'event.json':
continue
if f.endswith('.pyc'):
# We don't need the compiled files.
continue
copy(path_to_file, src)
def build(src, path_to_dist, output_filename):
"""Builds the file bundle.
:param str path_to_handler_file:
The path to handler (main execution) file.
:param str path_to_dist:
The path to the folder for distributable.
:param str output_filename:
The name of the archive file.
"""
# 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)
path_to_temp = mkdtemp(prefix='aws-lambda')
pip_install_to_target(path_to_temp)
# 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)
# Determine the filename and absolute path to the handler module.
handler = cfg.get('handler')
filename = get_handler_filename(handler)
path_to_handler_file = os.path.join(src, filename)
# "cd" into `temp_path` directory.
os.chdir(path_to_temp)
_, filename = os.path.split(path_to_handler_file)
# Copy handler file into root of the packages folder.
copyfile(path_to_handler_file, 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):
"""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.
"""
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
pip.main(['install', r, '-t', path, '--ignore-installed'])
def get_role_name(account_id):
"""Shortcut to insert the `account_id` into the iam string."""
return "arn:aws:iam::{0}:role/lambda_basic_execution".format(account_id)
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)
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')
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
)
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