add option to upload dependency layer to S3 first

Author: Josh Rosenberg

README.md

@@ -29,6 +29,10 @@ Stored as secrets or env vars, doesn't matter. But also please don't put your AW
     - Partial ARN - `123456789012:function:my-function`
 - `requirements_txt`
     The name/path for the `requirements.txt` file. Defaults to `requirements.txt`.
+- `use_s3`
+    Whether to upload the dependency layer zip to S3 (required if the zip exceeds 50MB) or not. (If not, it's uploaded directly to Lambda.) Defaults to `false`.
+- `s3_bucket_name`
+    The S3 bucket name used if you are uploading the dependency layer to S3.
 
 
 ### Example workflow

action.yml

@@ -12,6 +12,14 @@ inputs:
   lambda_function_name:
     description: The Lambda function name. Check the AWS docs/readme for examples.
     required: true
+  use_s3:
+    description: Whether to use S3 (true) or not (false) for the dependencies layer upload.
+    required: false
+    default: 'false'
+  s3_bucket_name:
+    description: The S3 bucket name for the dependencies layer upload.
+    required: false
+    default: no-bucket-name-here
 runs:
   using: 'docker'
   image: 'Dockerfile'

entrypoint.sh

@@ -9,9 +9,18 @@ install_zip_dependencies(){
 }
 
 publish_dependencies_as_layer(){
-	echo "Publishing dependencies as a layer..."
-	local result=$(aws lambda publish-layer-version --layer-name "${INPUT_LAMBDA_LAYER_ARN}" --zip-file fileb://dependencies.zip)
-	LAYER_VERSION=$(jq '.Version' <<< "$result")
+	if [ "$INPUT_USE_S3" = true ]
+	then
+		echo "Uploading dependencies to S3..."
+		aws s3 cp dependencies.zip s3://"${INPUT_S3_BUCKET_NAME}"/dependencies.zip
+		echo "Publishing dependencies from S3 as a layer..."
+		local result=$(aws lambda publish-layer-version --layer-name "${INPUT_LAMBDA_LAYER_ARN}" --content S3Bucket="${INPUT_S3_BUCKET_NAME}",S3Key=dependencies.zip)
+		LAYER_VERSION=$(jq '.Version' <<< "$result")
+	else
+		echo "Publishing dependencies as a layer..."
+		local result=$(aws lambda publish-layer-version --layer-name "${INPUT_LAMBDA_LAYER_ARN}" --zip-file fileb://dependencies.zip)
+		LAYER_VERSION=$(jq '.Version' <<< "$result")
+	fi
 	rm -rf python
 	rm dependencies.zip
 }