Can't deserialize aws_lambda_events::dynamodb::EventRecord due to missing eventVersion field

[indiv0]

Hello! Thank you for this wonderful crate!

I'm using this crate in a Lambda that processes DynamoDB stream events coming from Kinesis.

I can't deserialize the events to aws_lambda_events::dynamodb::EventRecord because the eventVersion field is missing from them. The aws_lambda_events::dynamodb::EventRecord struct has the event_version field as being of type String rather than of type Option<String>. I'm not sure if this is a bug or if I'm just using the wrong type.

I've been able to get around this by duplicating the type, changing the type of the field to Option<String>, and deriving serde::Deserialize on it.

Here is the base64 decoding of the problematic EventRecord. Note the lack of eventVersion field.

{
  "awsRegion":"eu-west-1",
  "eventID":"00000000-0000-0000-0000-000000000000",
  "eventName":"INSERT",
  "userIdentity":null,
  "recordFormat":"application/json",
  "tableName":"examples",
  "dynamodb":{
    "ApproximateCreationDateTime":1649809356015,
    "Keys":{
      "id":{
        "S":"00000000-0000-0000-0000-000000000000"
      }
    },
    "NewImage":{
      "id":{
        "S":"00000000-0000-0000-0000-000000000000"
      },
      "created":{
        "S":"2022-02-16T15:12:00.14Z"
      }
    },
    "SizeBytes":292
  },
  "eventSource":"aws:dynamodb"
}

Here is what the above looks like as the data field of a lambda_runtime::LambdaEvent<aws_lambda_events::event::kinesis::KinesisEvent>.

{
  "Records":[
    {
      "kinesis":{
        "kinesisSchemaVersion":"1.0",
        "partitionKey":"00000000000000000000000000000000",
        "sequenceNumber":"49627941615570055579864951581810255285859251490098511874",
        "data":"eyJhd3NSZWdpb24iOiJldS13ZXN0LTEiLCJldmVudElEIjoiMDAwMDAwMDAtMDAwMC0wMDAwLTAwMDAtMDAwMDAwMDAwMDAwIiwiZXZlbnROYW1lIjoiSU5TRVJUIiwidXNlcklkZW50aXR5IjpudWxsLCJyZWNvcmRGb3JtYXQiOiJhcHBsaWNhdGlvbi9qc29uIiwidGFibGVOYW1lIjoiZXhhbXBsZXMiLCJkeW5hbW9kYiI6eyJBcHByb3hpbWF0ZUNyZWF0aW9uRGF0ZVRpbWUiOjE2NDk4MDkzNTYwMTUsIktleXMiOnsiaWQiOnsiUyI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLTAwMDAwMDAwMDAwMCJ9fSwiTmV3SW1hZ2UiOnsiaWQiOnsiUyI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLTAwMDAwMDAwMDAwMCJ9LCJjcmVhdGVkIjp7IlMiOiIyMDIyLTAyLTE2VDE1OjEyOjAwLjE0WiJ9fSwiU2l6ZUJ5dGVzIjoyOTJ9LCJldmVudFNvdXJjZSI6ImF3czpkeW5hbW9kYiJ9",
        "approximateArrivalTimestamp":1648225669.343
      },
      "eventSource":"aws:kinesis",
      "eventVersion":"1.0",
      "eventID":"shardId-000000000000:49627941615570055579864951581810255285859251490098511874",
      "eventName":"aws:kinesis:record",
      "invokeIdentityArn":"arn:aws:iam::111111111111:role/service-role/body-role-00000000",
      "awsRegion":"eu-west-1",
      "eventSourceARN":"arn:aws:kinesis:eu-west-1:000000000000:stream/examples_changes"
    }
  ]
}

[calavera]

Can you open a PR updating the type for that field? there are some fields that are not very well documented, so it's hard at times to know which ones are optional and which ones are not.