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Commit a535490

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‎README.md

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# Build AWS Lambda Layer zip file for Python Dependancies
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Creates an AWS Lambda Layers **optimized** zip file using the [Lambda Layer directory structure](https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html#configuration-layers-path), ensures compiled libraries are compatible with Lambda environment, and optimized to reduce file size.
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Creates an AWS Lambda Layers zip file that is **optimized** for: [Lambda Layer directory structure](https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html#configuration-layers-path), compiled library compatibility, and minimal file size.
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This function was created to address these issues:
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- Many methods of creating Lambda zip files for Python functions don't work for Lambda Layers because Lambda Layers require specific library paths within the zip
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- Some dependancies required compiled components, which requires that the zip is created in an environment that matches the Lambda runtime environment
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- Minimize the zip size by removing unnecessary items
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- Many methods of creating Lambda zip files for Python functions don't work for Lambda Layers
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- This is due to the fact Lambda Layers require specific library paths within the zip, where regular Lambda zips dont
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- Compiled dependancies must be created in an environment that matches the Lambda runtime
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- Reduce size of zip file by removing unnecessary libraries and files
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**Note: This script requires Docker and uses a container to mimic the Lambda environment.**
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Alternatively, add as a submodule:
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``` bash
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# PUBLIC USE HTTPS
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cd {repo root}
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# eventual public repo will use http
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git submodule add https://github.com/robertpeteuil/build-lambda-layer-python _build_layer
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# Update submodule
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git submodule update --init --recursive --remote
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## Use
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- Run the builder with the command `./build_layer.sh`
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- Optionally specify Python Version
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- `-p PYTHON_VER` - specifies the Python version: 2.7, 3.6, 3.7 (default 3.6)
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- or `_build_layer/build_layer.sh` if installed in sub-dir
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- It uses the first requirements.txt file found in these locations (in order):
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- same directory as script
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- parent directory of script (useful when used as submodule)
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- function sub-directory of the parent directory (useful when used as submodule)
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- Optionally specify Python Version
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- `-p PYTHON_VER` - specifies the Python version: 2.7, 3.6, 3.7 (default 3.6)
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## Reference - remove submodule
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If installed as submodule and want to remove
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If installed as submodule and need to remove
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``` bash
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# Remove the submodule entry from .git/config

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