Below we walk though a very simple example of writing your own serverless code / Lambda functions from a Linux workstation.
AWS Lambda currently supports the following languages:
- C# versions 1,2, & 2.1
- Go version 1
- Java version 8
- Node versions 4, 6 & 8
- Python versions 2 & 3
It is advisable that you at least know one of these programming scripting languages before you begin with any Lamba code.
For demonstration purposes we will continue with python3.
Step 1 - Create a workspace
Step 2 - Create lambda_function.py
Assuming we are creating a python-based lambda function:
Step 3 - Install any missing/prerequisite modules:
pip3 install <module> -t ./my_lamba_module
Step 4 - Code
Code away using your favourite IDE or text editor, or import a pre-programmed lambda from github. Don’t forget to install any missing modules.
Step 5 - Package it:
cd my_lambda_module;zip -r my_lambda.zip *
Goto the AWS console and open your lambda function, click ‘Edit Code Inline’, and change to ‘Upload a .ZIP file’
You code should appear after clicking ‘Save’
It is always a good idea to ‘Test’ you code before going straight into production; It may help to have a few print() statements to help you debug any issues through Cloudwatch logs.
Any missing modules can be rectified by repeating the install module above, simply re-zip, and re-upload until your happy your lambda code is functioning correctly.