[英]If a AWS Lambda function has event sources from multiple Kinesis streams, will the batch of incoming records be from a single Kinesis stream or a mix?
[英]AWS Lambda: can one Lambda function have Event Sources of both Kinesis and DynamoDB Streams?
一個 AWS Lambda 函數是否可以有兩個事件源,一個是 Kinesis 流,另一個是 DynamoDB 流?
我查看過,但沒有找到任何文檔說明我可以或不能為同一個 AWS Lambda 函數使用不同類型的事件源。
是的,lambda 函數可以具有不同類型的事件源,但您必須使用com.amazonaws.services.lambda.runtime.RequestStreamHandler
才能正確反序列化輸入數據。 這是因為調用com.amazonaws.services.lambda.runtime.RequestHandler
的內部 lambda 代碼不會根據類型動態反序列化數據,然后調用具有正確類型的重載方法,而是似乎反射性地選擇一個方法並調用它.
示例輸入:
Kinesis 事件輸入:
{
"Records": [
{
"kinesis": {
"kinesisSchemaVersion": "1.0",
"partitionKey": "1",
"sequenceNumber": "11111111111111111111111111111111111111111111111111111111",
"data": "e30=",
"approximateArrivalTimestamp": 1518397399.55
},
"eventSource": "aws:kinesis",
"eventVersion": "1.0",
"eventID": "shardId-000000000000:11111111111111111111111111111111111111111111111111111111",
"eventName": "aws:kinesis:record",
"invokeIdentityArn": "arn:aws:iam::111111111111:role/lambda_test-lambda-multipe-sources",
"awsRegion": "us-east-1",
"eventSourceARN": "arn:aws:kinesis:us-east-1:111111111111:stream/test-lambda-multipe-sources"
}
]
}
DynamoDb 流記錄:
{
"Records": [
{
"eventID": "11111111111111111111111111111111",
"eventName": "INSERT",
"eventVersion": "1.1",
"eventSource": "aws:dynamodb",
"awsRegion": "us-east-1",
"dynamodb": {
"ApproximateCreationDateTime": 1518397440,
"Keys": {
"key": {
"S": "asdf"
}
},
"NewImage": {
"key": {
"S": "asdf"
}
},
"SequenceNumber": "111111111111111111111111",
"SizeBytes": 14,
"StreamViewType": "NEW_AND_OLD_IMAGES"
},
"eventSourceARN": "arn:aws:dynamodb:us-east-1:111111111111:table/test-lambda-multipe-sources/stream/2018-02-11T18:57:44.017"
}
]
}
示例代碼:
public final class MultipleEventSourcesRequestHandler
implements RequestHandler<KinesisEvent, Void>
// implements RequestStreamHandler
{
private static final Logger LOG = LoggerFactory.getLogger(MultipleEventSourcesRequestHandler.class);
public Void handleRequest(final DynamodbEvent input, final Context context)
{
LOG.info("In DynamodbEvent handler with event of source: " + input.getRecords().get(0).getEventSource());
return null;
}
// public final void handleRequest(final InputStream input, final OutputStream output, final Context context)
// throws IOException
// {
// final byte[] serializedSpeechletRequest = IOUtils.toByteArray(input);
// LOG.info("In Stream handler. Request bytes: " + new String(serializedSpeechletRequest, StandardCharsets.UTF_8));
// output.close();
// }
public Void handleRequest(final KinesisEvent input, final Context context)
{
LOG.info("In KinesisEvent handler with event of source: " + input.getRecords().get(0).getEventSource());
return null;
}
}
示例日志:
2018-02-12 01:32:57 INFO (main) com.example.lambda.eventsourcetest.MultipleEventSourcesRequestHandler - In KinesisEvent handler with event of source: aws:dynamodb
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