create and update Lambda function on deploy

Author: mwunderl

.ebextensions/lambda-function.config

@@ -0,0 +1,59 @@
+Resources:
+  RandomNameFunction:
+    Type: "AWS::Lambda::Function"
+    Properties:
+      Code:
+        ZipFile: "PLACEHOLDER"
+      Description: "Generate random names"
+      Environment:
+        Variables:
+          REGION_NAME: {"Ref" : "AWS::Region"}
+          TOPIC_ARN: {"Ref" : "NotificationTopic"}
+      FunctionName: random-name
+      Handler: index.handler
+      Role: { "Fn::Join": [ "", [ "arn:aws:iam::",{"Ref" : "AWS::AccountId"},":role/service-role/lambda-scorekeep" ] ] }
+      Runtime: nodejs4.3
+
+packages:
+  yum:
+    jq: []
+    git: []
+
+commands:
+  install-npm:
+    command: sudo -u ec2-user /tmp/install-npm.sh
+    cwd: /home/ec2-user
+    test: "[ ! -d /home/ec2-user/.nvm ]"
+
+container_commands:
+  update-random-name:
+    command: /tmp/update-lambda.sh
+    leader_only: true
+
+files:
+  "/tmp/install-npm.sh":
+    mode: "000755"
+    owner: ec2-user
+    group: ec2-user
+    content: |
+      #!/bin/bash
+      curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.1/install.sh | bash
+      export NVM_DIR="$HOME/.nvm"
+      [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+      nvm install 4.3.2
+      mkdir -p /home/ec2-user/bin
+      ln -fs /home/ec2-user/.nvm/versions/node/v4.3.2/bin/npm /home/ec2-user/bin/npm
+      ln -fs /home/ec2-user/.nvm/versions/node/v4.3.2/bin/node /home/ec2-user/bin/node
+
+  "/tmp/update-lambda.sh":
+    mode: "000755"
+    owner: ec2-user
+    group: ec2-user
+    content: |
+      #!/bin/bash
+      REGION=$(/opt/elasticbeanstalk/bin/get-config environment | jq -r '.AWS_REGION')
+      STAGINGDIR=$(/opt/elasticbeanstalk/bin/get-config container -k container_staging_dir)
+      cd _lambda/random-name
+      /home/ec2-user/bin/npm install
+      zip -r ../random-name.zip *
+      aws lambda update-function-code --function-name random-name --zip-file fileb://../random-name.zip --region $REGION

README.md

@@ -1,26 +1,22 @@
 # Lambda integration
 This branch uses a Node.js Lambda function to generate random names for new users, instead of calling a web API. The Scorekeep API uses the AWS SDK to invoke the Lambda by function name (`random-name`) with Bean classes to represent (and serialize to/from) the input and output JSON.
 
-The Lambda function code is included in `_lambda/random-name/index.js`. Create a Lambda function with the following settings:
-- Template: blank function
-- Triggers: none
+The Lambda function code is included in `_lambda/random-name/index.js`. On deploy, configuration files in the .ebextensions folder create a function with the following settings:
 - Name: `random-name`
 - Runtime: Node.js 4.3
 - Description: `Generate random names`
 - Code: in `_Lambda/random-name`
-  - Run `npm install`
-  - Run `zip -r ../random-name.zip *`
-  - Upload the ZIP archive
 - Environment variables:
   - REGION_NAME: The region, e.g. `us-east-2`
   - TOPIC_ARN: The ARN of an [SNS Topic](https://console.aws.amazon.com/sns/v2/home)
-- Role with permission to call SNS
-- Test event:
-```
-{
-  "userid": "1ABCDEFG"
-}
-```
+- Role named "lambda-scorekeep"
+
+Create a role named "lambda-scorekeep" in the IAM management console and add the following policies:
+- AWSLambdaBasicExecutionRole
+- AmazonSNSFullAccess
+
+While you are there, add the following policy to your instance profile (aws-elasticbeanstalk-ec2-role) to let the environment create the Lambda function:
+- AWSLambdaFullAccess
 
 The Scorekeep API integration is implemented in the following files-
 `src/main/java/scorekeep/`

_lambda/update-random-name.sh

@@ -1,3 +1,4 @@
+#!/bin/bash
 cd random-name
 npm install
 zip -r ../random-name.zip *