[AWS - DA] Lambda (ALB, Mult-values header, Edge, Async invocation, Event Source Mapping, Destination) PART 1

时间:2021-06-03 18:21:09   收藏:0   阅读:0

Lambda integration with ALB

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ALB Multi-Header Values

If a client connect to ALB, we can config settings of ALB whether support Multi-Header Values.

For example, client send query parameters `?name=foo&name=bar` which will be converted to `name: [‘foo‘, ‘bar‘]`

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When enable Multi-value headers: HTTP headers and query string parameters that are sent with multiple values are shown as arrays within the AWS Lambda event are response objects.

 

Ref: https://www.cnblogs.com/Answer1215/p/14844873.html

 

Lambda@Edge

You have deployed a CDN using CloudFront. You want to run a global AWS Lambda alongside with CDN.

Lambda@Edge allows you to

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Lambda - Asynchronous Invocations

How it works?

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For example, s3 trigger Lambda, it will put events into a Queue, Lambda will read from Queue max 3 times if need retry, then you will see multi logs in CloudWatch. After 3 times retry, will send to DLQ.

Return StatusCode for Asyn is 202.

Enable DLQ for Lambda, you also need to attach IAM policy

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Event Source Mapping

Lambda need to poll from the source. Lambda function is invoked synchronouly.

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Destination

On Lambda invoke success or failure, you can send data to another AWS service, such as SQS or Kinesis.

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For example, you upload an image to S3, and trigger Lambda processing, on sucess send message to a SQS; on failure, send message to another SQS

 

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