嗨，我已经在Java中创建了一个处理程序来从dynamo DB中获取事件
这是我的代码
package com.Lambda.dynamodb;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.DynamodbEvent;
import com.amazonaws.services.lambda.runtime.events.DynamodbEvent.DynamodbStreamRecord;
public class DDBEventProcessor implements
RequestHandler<DynamodbEvent, String> {
public String handleRequest(DynamodbEvent ddbEvent, Context context) {
for (DynamodbStreamRecord record : ddbEvent.getRecords()){
System.out.println(record.getEventID());
System.out.println(record.getEventName());
System.out.println(record.getDynamodb().toString());
}
return "Successfully processed " + ddbEvent.getRecords().size() + " records.";
}
}
Lambda函数能够在cloudwatch中写入事件，但是挑战在于我必须将所有流记录索引到AWS Elasticsearch Service端点并对其进行索引。通过博客搜索时，我在python和node.js中没有几个代码示例，但我的要求是我必须在Java中构建此lambda函数]
有人可以建议如何在java lambda函数中实现这一点吗？
您好，我包含以下代码可能对某些人有所帮助。 Dynamo DB流在AWS内部和外部AWS中在Elasticsearch中为文档编制索引]
package com.Firstlambda;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.auth.AWS4Signer;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.services.dynamodbv2.document.Item;
import com.amazonaws.services.dynamodbv2.document.ItemUtils;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.lambda.runtime.events.DynamodbEvent;
import com.amazonaws.services.lambda.runtime.events.DynamodbEvent.DynamodbStreamRecord;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class HelloWorld implements RequestHandler<DynamodbEvent, String> {
private static String serviceName = "es";
private static String region = "us-east-1";
private static String aesEndpoint = ""
private static String index = "";
private static String type = "_doc";
static final AWSCredentialsProvider credentialsProvider = new DefaultAWSCredentialsProviderChain();
public String handleRequest(DynamodbEvent ddbEvent, Context context) {
for (DynamodbStreamRecord record : ddbEvent.getRecords()) {
System.out.println("EventName : " + record.getEventName());
System.out.println("EventName : " + record.getDynamodb());
//AWS outside
RestHighLevelClient esClient = esClient();
//AWS outside
//AWS Inside
//RestHighLevelClient esClient = esClient(serviceName, region);
//AWS Inside
if (record.getEventName().toLowerCase().equals("insert")) {
String JsonString = getJsonstring(record.getDynamodb().getNewImage());
String JsonUniqueId = GetIdfromJsonString(JsonString);
IndexRequest indexRequest = new IndexRequest(index, type, JsonUniqueId);
indexRequest.source(JsonString, XContentType.JSON);
try {
IndexResponse indexResponse = esClient.index(indexRequest, RequestOptions.DEFAULT);
System.out.println(indexResponse.toString());
return "Successfully processed " + ddbEvent.getRecords().size() + " records.";
} catch (IOException e) {
System.out.println(e.getMessage());
}
} else if (record.getEventName().toLowerCase().equals("modify")) {
String JsonString = getJsonstring(record.getDynamodb().getNewImage());
String JsonUniqueId = GetIdfromJsonString(JsonString);
UpdateRequest request = new UpdateRequest(index, type, JsonUniqueId);
String jsonString = JsonString;
request.doc(jsonString, XContentType.JSON);
try {
UpdateResponse updateResponse = esClient.update(
request, RequestOptions.DEFAULT);
System.out.println(updateResponse.toString());
return "Successfully processed " + ddbEvent.getRecords().size() + " records.";
} catch (IOException e) {
System.out.println(e.getMessage());
}
} else {
System.out.println("remove");
System.out.println("KEYID : " + record.getDynamodb().getKeys().get("ID").getN());
String deletedId = record.getDynamodb().getKeys().get("ID").getN();
DeleteRequest request = new DeleteRequest(index, type, deletedId);
try {
DeleteResponse deleteResponse = esClient.delete(
request, RequestOptions.DEFAULT);
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
}
return "Successfullyprocessed";
}
public String getJsonstring(Map<String, AttributeValue> newIma) {
String json = null;
Map<String, AttributeValue> newImage = newIma;
List<Map<String, AttributeValue>> listOfMaps = new ArrayList<Map<String, AttributeValue>>();
listOfMaps.add(newImage);
List<Item> itemList = ItemUtils.toItemList(listOfMaps);
for (Item item : itemList) {
json = item.toJSON();
}
return json;
}
public String GetIdfromJsonString(String Json) {
JSONObject jsonObj = new JSONObject(Json);
return String.valueOf(jsonObj.getInt("ID"));
}
// Adds the interceptor to the ES REST client
// public static RestHighLevelClient esClient(String serviceName, String region) {
// AWS4Signer signer = new AWS4Signer();
// signer.setServiceName(serviceName);
// signer.setRegionName(region);
// HttpRequestInterceptor interceptor = new AWSRequestSigningApacheInterceptor(serviceName, signer, credentialsProvider);
// return new RestHighLevelClient(RestClient.builder(HttpHost.create(aesEndpoint)).setHttpClientConfigCallback(hacb -> hacb.addInterceptorLast(interceptor)));
// }
public static RestHighLevelClient esClient() {
String host = "d9bc7cbca5ec49ea96a6ea683f70caca.eastus2.azure.elastic-cloud.com";
int port = 9200;
String userName = "elastic";
String password = "L4Nfnle3wxLmV95lffwsf$Ub46hp";
String protocol = "https";
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY,
new UsernamePasswordCredentials(userName, password));
RestClientBuilder builder = RestClient.builder(new HttpHost(host, port, protocol))
.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
RestHighLevelClient client = new RestHighLevelClient(builder);
return client;
}
}
这只是示例代码，必须根据我们的要求进行修改