在昨天的 AWS 台北高峰會上，AWS 的人有提到這個功能應該要正式推出了，果然在回來不久後就看到消息了：「AWS Lambda Adds Amazon Simple Queue Service to Supported Event Sources」。
We can now use Amazon Simple Queue Service (SQS) to trigger AWS Lambda functions! This is a stellar update with some key functionality that I’ve personally been looking forward to for more than 4 years. I know our customers are excited to take it for a spin so feel free to skip to the walk through section below if you don’t want a trip down memory lane.
這算是 Serverless 架構下很自然會想要做的一環，當 SQS 裡面有東西的時候就呼叫 Lambda 起來做事，以往一般會透過 SNS 在中間接起來 (或是拿 S3 惡搞，因為 S3 也可以串 Lambda...)，現在可以直接串了：
By adding support for SQS to Lambda we’re removing a lot of the undifferentiated heavy lifting of running a polling service or creating an SQS to SNS mapping.
這個功能本身不收費，但他需要的 SQS API call 與產生的 Lambda 當然是需要收費的：
There are no additional charges for this feature, but because the Lambda service is continuously long-polling the SQS queue the account will be charged for those API calls at the standard SQS pricing rates.