Amazon Lambda - Alias specific configuration

Question

I have setup a Amazon Lambda function that has different Aliases for development, test and production and an API gateway that has several stages pointing to the respective Alias versions.

Now I want to access a database table and obviously each Alias should access it's own table. In the documentation I couldn't find a possibility to pass an Alias specific configuration to my function. Is there a best practice for this?

Mark B · Accepted Answer · 2016-05-15 19:57:28Z

1

Setup Stage Variables in API Gateway, and add something like the following to your mapping template(s) to pass those stage variables to the Lambda functions.

  "stage-variables" : {
    #foreach($key in $stageVariables.keySet())
      "$key" : "$util.escapeJavaScript($stageVariables.get($key))"
      #if($foreach.hasNext),#end
    #end
  }

The Lambda functions can then pull things like DB table names from the event object.

answered May 15, 2016 at 19:57

Mark B

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4 Comments

Matthias Over a year ago

That sounds like a good solution for functions that are exposed via API gateway. Is there a similar best practice for functions which are triggered by S3 or SNS?

Mark B Over a year ago

Unfortunately those are more difficult. You could possibly use a DynamoDB table to store settings specific to different function aliases. Then you could check the context object to get the functionVersion value and then lookup the settings from DynamoDB.

Mark B Over a year ago

It looks like you can also get the alias from process.env.AWS_LAMBDA_FUNCTION_VERSION

Matthias Over a year ago

That sounds like a good idea. Instead of using a DynamoDB table I use a config file, but otherwise I use your suggestion

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