Run lambda function on local machine
Please use a newly created virtualenv of Python 2.7 or Python 3.6 .
Within virtualenv, run the following command.
$ pip install python-lambda-local
This will install the package with name python-lambda-local
in the virtualenv.
Now you can use the command python-lambda-local
to run your AWS Lambda function written in Python on your own machine.
Run python-lambda-local -h
to see the help.
usage: python-lambda-local [-h] [-l LIBRARY_PATH] [-f HANDLER_FUNCTION]
[-t TIMEOUT] [-a ARN_STRING] [-v VERSION_NAME]
[--version]
FILE EVENT
Run AWS Lambda function written in Python on local machine.
positional arguments:
FILE lambda function file name
EVENT event data file name
optional arguments:
-h, --help show this help message and exit
-l LIBRARY_PATH, --library LIBRARY_PATH
path of 3rd party libraries
-f HANDLER_FUNCTION, --function HANDLER_FUNCTION
lambda function handler name, default: "handler"
-t TIMEOUT, --timeout TIMEOUT
seconds until lambda function timeout, default: 3
-a ARN_STRING, --arn-string ARN_STRING
ARN string for lambda function
-v VERSION_NAME, --version-name VERSION_NAME
lambda function version name
-e ENVIRONMENT_VARIABLES, --environment-variables ENVIRONMENT_VARIABLES
path to flat json file with environment variables
--version print the version of python-lambda-local and exit
Suppose your project directory is like this:
├── event.json
├── lib
│ ├── rx
│ │ ├── abstractobserver.py
│ │ ├── ... (package content of rx)
...
│ │ └── testscheduler.py
│ └── Rx-1.2.3.dist-info
│ ├── DESCRIPTION.rst
│ ├── METADATA
│ ├── metadata.json
│ ├── pbr.json
│ ├── RECORD
│ ├── top_level.txt
│ ├── WHEEL
│ └── zip-safe
└── test.py
The handler's code is in test.py
and the function name of the handler is handler
.
The source depends on 3rd party library rx
and it is installed in the directory lib
.
The test event in json format is in event.json
file.
from __future__ import print_function
from rx import Observable
def handler(event, context):
xs = Observable.from_(range(event['answer']))
ys = xs.to_blocking()
zs = (x*x for x in ys if x % 7 == 0)
for x in zs:
print(x)
{
"answer": 42
}
Within the project root directory, you can run the lambda function with the following command
python-lambda-local -l lib/ -f handler -t 5 test.py event.json
The output will be like:
[root - INFO - 2017-04-19 12:39:05,512] Event: {u'answer': 42}
[root - INFO - 2017-04-19 12:39:05,512] START RequestId: b918f9ae-0ca1-44af-9937-dd5f9eeedcc1
0
49
196
441
784
1225
[root - INFO - 2017-04-19 12:39:05,515] END RequestId: b918f9ae-0ca1-44af-9937-dd5f9eeedcc1
[root - INFO - 2017-04-19 12:39:05,515] RESULT:
None
[root - INFO - 2017-04-19 12:39:05,515] REPORT RequestId: b918f9ae-0ca1-44af-9937-dd5f9eeedcc1 Duration: 2.27 ms