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chaos-lambda-0.3
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مشاهده بیشترتوضیحات
Decorators and Class to inject failures into AWS Lambda functions
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | chaos-lambda-0.3 |
| نام | chaos-lambda |
| نسخه کتابخانه | 0.3 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Adrian Hornsby |
| ایمیل نویسنده | hornsby.adrian@gmail.com |
| آدرس صفحه اصلی | https://github.com/adhorn/aws-lambda-chaos-injection |
| آدرس اینترنتی | https://pypi.org/project/chaos-lambda/ |
| مجوز | MIT |
Chaos Injection for AWS Lambda - chaos_lambda
======================================================
|docs| |issues| |Maintenance| |Pypi| |Travis| |Coveralls| |twitter|
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:alt: Twitter
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:alt: Issues
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:alt: Maintenance
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``chaos_lambda`` is a small library injecting chaos into `AWS Lambda
<https://aws.amazon.com/lambda/>`_.
It offers simple python decorators to do `delay`, `exception` and `statusCode` injection
and a Class to add `delay` to any 3rd party dependencies called from your function.
This allows to conduct small chaos engineering experiments for your serverless application
in the `AWS Cloud <https://aws.amazon.com>`_.
* Support for Latency injection using ``delay``
* Support for Exception injection using ``exception_msg``
* Support for HTTP Error status code injection using ``error_code``
* Using for SSM Parameter Store to control the experiment using ``isEnabled``
* Support for adding rate of failure using ``rate``. (Default rate = 1)
* Per Lambda function injection control using Environment variable (``CHAOS_PARAM``)
Install
--------
.. code:: shell
pip install chaos-lambda
Example
--------
.. code:: python
# function.py
import os
from chaos_lambda import inject_fault
# this should be set as a Lambda environment variable
os.environ['CHAOS_PARAM'] = 'chaoslambda.config'
@inject_fault
def handler(event, context):
return {
'statusCode': 200,
'body': 'Hello from Lambda!'
}
Considering a configuration as follows:
.. code:: json
{
"fault_type": "exception",
"delay": 400,
"is_enabled": true,
"error_code": 404,
"exception_msg": "This is chaos",
"rate": 1
}
When excecuted, the Lambda function, e.g ``handler('foo', 'bar')``, will produce the following result:
.. code:: shell
exception_msg from config chaos with a rate of 1
corrupting now
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/.../chaos_lambda.py", line 199, in wrapper
raise Exception(exception_msg)
Exception: This is chaos
Configuration
-------------
The configuration for the failure injection is stored in the `AWS SSM Parameter Store
<https://aws.amazon.com/ssm/>`_ and accessed at runtime by the ``get_config()``
function:
.. code:: json
{
"fault_type": "exception",
"delay": 400,
"is_enabled": true,
"error_code": 404,
"exception_msg": "This is chaos",
"rate": 1
}
To store the above configuration into SSM using the `AWS CLI <https://aws.amazon.com/cli>`_ do the following:
.. code:: shell
aws ssm put-parameter --name chaoslambda.config --type String --overwrite --value "{ "delay": 400, "is_enabled": true, "error_code": 404, "exception_msg": "This is chaos", "rate": 1, "fault_type": "exception"}" --region eu-west-1
AWS Lambda will need to have `IAM access to SSM <https://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-paramstore-access.html>`_.
.. code:: json
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"ssm:DescribeParameters"
],
"Resource": "*"
},
{
"Effect": "Allow",
"Action": [
"ssm:GetParameters",
"ssm:GetParameter"
],
"Resource": "arn:aws:ssm:eu-north-1:12345678910:parameter/chaoslambda.config"
}
]
}
Supported Decorators:
---------------------
``chaos_lambda`` currently supports the following faults:
* `latency` - Add latency in the AWS Lambda execution
* `exception` - Raise an exception during the AWS Lambda execution
* `status_code` - force AWS Lambda to return a specific HTTP error code
More information:
-----------------
`Full Documentation <https://aws-lambda-chaos-injection.readthedocs.io/en/latest/>`_
نیازمندی
| مقدار | نام |
|---|---|
| - | boto3 |
| - | future |
| - | ssm-cache |
| - | requests |
نحوه نصب
نصب پکیج whl chaos-lambda-0.3:
pip install chaos-lambda-0.3.whl
نصب پکیج tar.gz chaos-lambda-0.3:
pip install chaos-lambda-0.3.tar.gz