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https://github.com/HDE/python-lambda-local
Run AWS Lambda function on local machine
https://github.com/HDE/python-lambda-local
aws-lambda local-machine python-lambda-local python37 python38 python39 virtualenv
Last synced: 3 months ago
JSON representation
Run AWS Lambda function on local machine
- Host: GitHub
- URL: https://github.com/HDE/python-lambda-local
- Owner: HDE
- License: mit
- Created: 2015-10-16T03:06:10.000Z (about 9 years ago)
- Default Branch: master
- Last Pushed: 2024-07-16T10:07:51.000Z (4 months ago)
- Last Synced: 2024-07-16T12:44:54.035Z (4 months ago)
- Topics: aws-lambda, local-machine, python-lambda-local, python37, python38, python39, virtualenv
- Language: Python
- Homepage:
- Size: 90.8 KB
- Stars: 302
- Watchers: 20
- Forks: 35
- Open Issues: 11
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.txt
- License: LICENSE
Awesome Lists containing this project
- starred-awesome - python-lambda-local - Run AWS Lambda function on local machine (Python)
README
# python-lambda-local
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Run lambda function on local machine
## Prepare development environment
Please use a newly created virtualenv of Python 3.7+.
## Installation
Within virtualenv, run the following command.
``` bash
$ 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.
## Usage as a shell command
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]
[-e ENVIRONMENT_VARIABLES] [--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
```
### Prepare development directory
#### Project directory structure
Suppose your project directory is like this:
```
├── event.json
├── lib
│ ├── rx
│ │ ├── abstractobserver.py
│ │ ├── ... (package content of rx)
...
│ │ └── testscheduler.py
│ └── Rx-1.6.1.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.
#### Installing `rx` library in `lib/`
``` bash
pip install --target lib rx==1.6.1
```
#### Content of `test.py`:
``` python
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)
```
#### Content of `event.json`:
``` json
{
"answer": 42
}
```
#### Run the lambda function
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 - 2018-11-20 17:10:53,352] Event: {'answer': 42}
[root - INFO - 2018-11-20 17:10:53,352] START RequestId: 3c8e6db4-886a-43da-a1c7-5e6f715de531 Version:
0
49
196
441
784
1225
[root - INFO - 2018-11-20 17:10:53,359] END RequestId: 3c8e6db4-886a-43da-a1c7-5e6f715de531
[root - INFO - 2018-11-20 17:10:53,360] REPORT RequestId: 3c8e6db4-886a-43da-a1c7-5e6f715de531 Duration: 2.17 ms
[root - INFO - 2018-11-20 17:10:53,360] RESULT:
None
```
## Usage as a library
### API signature
``` python
call(func, event, context, environment_variables={})
```
Call a handler function `func` with given `event`, `context` and custom `environment_variables`.
### Sample
1. Make sure the 3rd party libraries used in the AWS Lambda function can be imported.
``` bash
pip install rx==1.6.1
```
2. To call the lambda function above with your python code:
``` python
from lambda_local.main import call
from lambda_local.context import Context
import test
event = {
"answer": 42
}
context = Context(5)
if __name__ == '__main__':
call(test.handler, event, context)
```