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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.

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