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Melaporkan kegagalan item batch untuk fungsi Lambda dengan pemicu DynamoDB
Contoh kode berikut menunjukkan cara mengimplementasikan respons batch sebagian untuk fungsi Lambda yang menerima peristiwa dari aliran DynamoDB. Fungsi melaporkan kegagalan item batch dalam respons, memberi sinyal ke Lambda untuk mencoba lagi pesan tersebut nanti.
- .NET
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- AWS SDK for .NET
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan penggunaan Lambda. NET.
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 using System.Text.Json; using System.Text; using Amazon.Lambda.Core; using Amazon.Lambda.DynamoDBEvents; // Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class. [assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))] namespace AWSLambda_DDB; public class Function { public StreamsEventResponse FunctionHandler(DynamoDBEvent dynamoEvent, ILambdaContext context) { context.Logger.LogInformation($"Beginning to process {dynamoEvent.Records.Count} records..."); List<StreamsEventResponse.BatchItemFailure> batchItemFailures = new List<StreamsEventResponse.BatchItemFailure>(); StreamsEventResponse streamsEventResponse = new StreamsEventResponse(); foreach (var record in dynamoEvent.Records) { try { var sequenceNumber = record.Dynamodb.SequenceNumber; context.Logger.LogInformation(sequenceNumber); } catch (Exception ex) { context.Logger.LogError(ex.Message); batchItemFailures.Add(new StreamsEventResponse.BatchItemFailure() { ItemIdentifier = record.Dynamodb.SequenceNumber }); } } if (batchItemFailures.Count > 0) { streamsEventResponse.BatchItemFailures = batchItemFailures; } context.Logger.LogInformation("Stream processing complete."); return streamsEventResponse; } }
- Go
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- SDKuntuk Go V2
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan Lambda menggunakan Go.
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 package main import ( "context" "github.com/aws/aws-lambda-go/events" "github.com/aws/aws-lambda-go/lambda" ) type BatchItemFailure struct { ItemIdentifier string `json:"ItemIdentifier"` } type BatchResult struct { BatchItemFailures []BatchItemFailure `json:"BatchItemFailures"` } func HandleRequest(ctx context.Context, event events.DynamoDBEvent) (*BatchResult, error) { var batchItemFailures []BatchItemFailure curRecordSequenceNumber := "" for _, record := range event.Records { // Process your record curRecordSequenceNumber = record.Change.SequenceNumber } if curRecordSequenceNumber != "" { batchItemFailures = append(batchItemFailures, BatchItemFailure{ItemIdentifier: curRecordSequenceNumber}) } batchResult := BatchResult{ BatchItemFailures: batchItemFailures, } return &batchResult, nil } func main() { lambda.Start(HandleRequest) }
- Java
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- SDKuntuk Java 2.x
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan Lambda menggunakan Java.
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 import com.amazonaws.services.lambda.runtime.Context; import com.amazonaws.services.lambda.runtime.RequestHandler; import com.amazonaws.services.lambda.runtime.events.DynamodbEvent; import com.amazonaws.services.lambda.runtime.events.StreamsEventResponse; import com.amazonaws.services.lambda.runtime.events.models.dynamodb.StreamRecord; import java.io.Serializable; import java.util.ArrayList; import java.util.List; public class ProcessDynamodbRecords implements RequestHandler<DynamodbEvent, Serializable> { @Override public StreamsEventResponse handleRequest(DynamodbEvent input, Context context) { List<StreamsEventResponse.BatchItemFailure> batchItemFailures = new ArrayList<>(); String curRecordSequenceNumber = ""; for (DynamodbEvent.DynamodbStreamRecord dynamodbStreamRecord : input.getRecords()) { try { //Process your record StreamRecord dynamodbRecord = dynamodbStreamRecord.getDynamodb(); curRecordSequenceNumber = dynamodbRecord.getSequenceNumber(); } catch (Exception e) { /* Since we are working with streams, we can return the failed item immediately. Lambda will immediately begin to retry processing from this failed item onwards. */ batchItemFailures.add(new StreamsEventResponse.BatchItemFailure(curRecordSequenceNumber)); return new StreamsEventResponse(batchItemFailures); } } return new StreamsEventResponse(); } }
- JavaScript
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- SDKuntuk JavaScript (v3)
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan penggunaan Lambda. JavaScript
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 export const handler = async (event) => { const records = event.Records; let curRecordSequenceNumber = ""; for (const record of records) { try { // Process your record curRecordSequenceNumber = record.dynamodb.SequenceNumber; } catch (e) { // Return failed record's sequence number return { batchItemFailures: [{ itemIdentifier: curRecordSequenceNumber }] }; } } return { batchItemFailures: [] }; };
Melaporkan kegagalan item batch DynamoDB dengan penggunaan Lambda. TypeScript
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 import { DynamoDBBatchResponse, DynamoDBBatchItemFailure, DynamoDBStreamEvent, } from "aws-lambda"; export const handler = async ( event: DynamoDBStreamEvent ): Promise<DynamoDBBatchResponse> => { const batchItemFailures: DynamoDBBatchItemFailure[] = []; let curRecordSequenceNumber; for (const record of event.Records) { curRecordSequenceNumber = record.dynamodb?.SequenceNumber; if (curRecordSequenceNumber) { batchItemFailures.push({ itemIdentifier: curRecordSequenceNumber, }); } } return { batchItemFailures: batchItemFailures }; };
- PHP
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- SDKuntuk PHP
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan penggunaan Lambda. PHP
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: Apache-2.0 <?php # using bref/bref and bref/logger for simplicity use Bref\Context\Context; use Bref\Event\DynamoDb\DynamoDbEvent; use Bref\Event\Handler as StdHandler; use Bref\Logger\StderrLogger; require __DIR__ . '/vendor/autoload.php'; class Handler implements StdHandler { private StderrLogger $logger; public function __construct(StderrLogger $logger) { $this->logger = $logger; } /** * @throws JsonException * @throws \Bref\Event\InvalidLambdaEvent */ public function handle(mixed $event, Context $context): array { $dynamoDbEvent = new DynamoDbEvent($event); $this->logger->info("Processing records"); $records = $dynamoDbEvent->getRecords(); $failedRecords = []; foreach ($records as $record) { try { $data = $record->getData(); $this->logger->info(json_encode($data)); // TODO: Do interesting work based on the new data } catch (Exception $e) { $this->logger->error($e->getMessage()); // failed processing the record $failedRecords[] = $record->getSequenceNumber(); } } $totalRecords = count($records); $this->logger->info("Successfully processed $totalRecords records"); // change format for the response $failures = array_map( fn(string $sequenceNumber) => ['itemIdentifier' => $sequenceNumber], $failedRecords ); return [ 'batchItemFailures' => $failures ]; } } $logger = new StderrLogger(); return new Handler($logger);
- Python
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- SDKuntuk Python (Boto3)
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan Lambda menggunakan Python.
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: Apache-2.0 def handler(event, context): records = event.get("Records") curRecordSequenceNumber = "" for record in records: try: # Process your record curRecordSequenceNumber = record["dynamodb"]["SequenceNumber"] except Exception as e: # Return failed record's sequence number return {"batchItemFailures":[{"itemIdentifier": curRecordSequenceNumber}]} return {"batchItemFailures":[]}
- Ruby
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- SDKuntuk Ruby
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan Lambda menggunakan Ruby.
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: Apache-2.0 def lambda_handler(event:, context:) records = event["Records"] cur_record_sequence_number = "" records.each do |record| begin # Process your record cur_record_sequence_number = record["dynamodb"]["SequenceNumber"] rescue StandardError => e # Return failed record's sequence number return {"batchItemFailures" => [{"itemIdentifier" => cur_record_sequence_number}]} end end {"batchItemFailures" => []} end
- Rust
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- SDKuntuk Rust
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver
. Melaporkan kegagalan item batch DynamoDB dengan Lambda menggunakan Rust.
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 use aws_lambda_events::{ event::dynamodb::{Event, EventRecord, StreamRecord}, streams::{DynamoDbBatchItemFailure, DynamoDbEventResponse}, }; use lambda_runtime::{run, service_fn, Error, LambdaEvent}; /// Process the stream record fn process_record(record: &EventRecord) -> Result<(), Error> { let stream_record: &StreamRecord = &record.change; // process your stream record here... tracing::info!("Data: {:?}", stream_record); Ok(()) } /// Main Lambda handler here... async fn function_handler(event: LambdaEvent<Event>) -> Result<DynamoDbEventResponse, Error> { let mut response = DynamoDbEventResponse { batch_item_failures: vec![], }; let records = &event.payload.records; if records.is_empty() { tracing::info!("No records found. Exiting."); return Ok(response); } for record in records { tracing::info!("EventId: {}", record.event_id); // Couldn't find a sequence number if record.change.sequence_number.is_none() { response.batch_item_failures.push(DynamoDbBatchItemFailure { item_identifier: Some("".to_string()), }); return Ok(response); } // Process your record here... if process_record(record).is_err() { response.batch_item_failures.push(DynamoDbBatchItemFailure { item_identifier: record.change.sequence_number.clone(), }); /* Since we are working with streams, we can return the failed item immediately. Lambda will immediately begin to retry processing from this failed item onwards. */ return Ok(response); } } tracing::info!("Successfully processed {} record(s)", records.len()); Ok(response) } #[tokio::main] async fn main() -> Result<(), Error> { tracing_subscriber::fmt() .with_max_level(tracing::Level::INFO) // disable printing the name of the module in every log line. .with_target(false) // disabling time is handy because CloudWatch will add the ingestion time. .without_time() .init(); run(service_fn(function_handler)).await }
Untuk daftar lengkap panduan AWS SDK pengembang dan contoh kode, lihatMenggunakan DynamoDB dengan AWS SDK. Topik ini juga mencakup informasi tentang memulai dan detail tentang SDK versi sebelumnya.