Java Code Examples for com.amazonaws.services.lambda.runtime.LambdaLogger#log()

@Override
public String handleRequest(String event, Context context) {
    LambdaLogger logger = context.getLogger();
    String email = event ;

    // log execution details
    logger.log("Email value " + email);

    SendMessage msg = new SendMessage();
    try {
       msg.sendMessage(email);

   } catch (IOException e) {
       e.getStackTrace();
   }

    return "";

}
 

@Override
public final Boolean processEvent(final SNSEvent event, final String outputQueueURL, final LambdaLogger logger) {

    try {

        logger.log("Number of records in event: " + event.getRecords().size());

        Collection<SendMessageBatchRequestEntry> entries = new ArrayList<>();

        int idVal = 1;
        for (SNSRecord r : event.getRecords()) {
            logger.log("Adding message: " + r.getSNS().getMessage());
            entries.add(new SendMessageBatchRequestEntry("id_" + idVal, r.getSNS().getMessage()));
            idVal++;
        }

        final SendMessageBatchRequest sendBatchRequest = new SendMessageBatchRequest()
                .withQueueUrl(outputQueueURL)
                .withEntries(entries);
        this.sqsClient.sendMessageBatch(sendBatchRequest);

    } catch (Exception e) {
        final String errorMessage = "Error occurred: " + e.getMessage();
        logger.log(errorMessage);
        return false;
    }

    return true;

}
 

/**
 * handleRequest implementation.
 * @param inputStream - Input stream from API Gateway.
 * @param outputStream - Output stream to API Gateway.
 * @param context - Context.
 * @throws IOException - If something goes wrong.
 */
public final void handleRequest(final InputStream inputStream,
                                final OutputStream outputStream,
                                final Context context) throws IOException {

    LambdaLogger logger = context.getLogger();
    context.getLogger().log("Inside Proxy Stream Handler.");

    final String greeting = generateGreetingFromInputStream(inputStream);
    final JSONObject responseJson = generateResponseJson(greeting);

    logger.log(responseJson.toJSONString());

    OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
    writer.write(responseJson.toJSONString());
    writer.close();
}
 

/**
 * Handle request.
 *
 * @param kinesisEvent  - Kinesis Event passed as input to lambda handler
 * @param context - context object
 * @return true if success, else false.
 */
public Boolean handleRequest(final KinesisEvent kinesisEvent, final Context context) {

    LambdaLogger logger = context.getLogger();
    logger.log("Received Kinesis event: " + kinesisEvent);
    logger.log("Number of records: " + kinesisEvent.getRecords().size());

    try {
        kinesisEvent.getRecords().forEach(r -> {
            final KinesisEvent.Record kr = r.getKinesis();
            logger.log("Record: " + kr.toString());
            logger.log("Data: " + StandardCharsets.UTF_8.decode(kr.getData()).toString());
        });
    } catch (final Exception e) {
        logger.log("There was an exception: " + e.getMessage());
        return false;
    }

    return true;
}
 

@Override
public Void handleRequest(KinesisEvent event, Context context) {
	LambdaLogger logger = context.getLogger();

	// extract the records from the event
	List<KinesisEventRecord> records = event.getRecords();

	logger.log(String.format("Recieved %s Raw Records", records.size()));

	try {
		// now deaggregate the message contents
		List<KinesisClientRecord> deaggregated = new RecordDeaggregator<KinesisEventRecord>().deaggregate(records);
		logger.log(String.format("Received %s Deaggregated User Records", deaggregated.size()));

		deaggregated.stream().forEachOrdered(rec -> {
			logger.log(rec.partitionKey());
		});
	} catch (Exception e) {
		logger.log(e.getMessage());
	}

	return null;
}
 

@Override
public Void handleRequest(KinesisEvent event, Context context) {
	LambdaLogger logger = context.getLogger();

	// extract the records from the event
	List<KinesisEventRecord> records = event.getRecords();

	logger.log(String.format("Recieved %s Raw Records", records.size()));

	// now deaggregate the message contents
	List<UserRecord> deaggregated = new RecordDeaggregator<KinesisEventRecord>().deaggregate(records);
	logger.log(String.format("Received %s Deaggregated User Records", deaggregated.size()));
	
	deaggregated.stream().forEachOrdered(rec -> {
		logger.log(rec.getPartitionKey());
	});

	return null;
}
 

/**
 * Check if the input aggregated record is complete and if so, forward it to the
 * configured destination Kinesis stream.
 * 
 * @param logger The LambdaLogger from the input Context
 * @param aggRecord The aggregated record to transmit or null if the record isn't full yet.
 */
private void checkAndForwardRecords(LambdaLogger logger, AggRecord aggRecord)
{
    if(aggRecord == null)
    {
        return;
    }
    
    logger.log("Forwarding " + aggRecord.getNumUserRecords() + " as an aggregated record.");
    
    PutRecordRequest request = aggRecord.toPutRecordRequest(DESTINATION_STREAM_NAME);
    try
    {
        PutRecordResult result = this.kinesisForwarder.putRecord(request);
        logger.log("Successfully published record Seq #" + result.getSequenceNumber() + " to shard " + result.getShardId());
    }
    catch(Exception e)
    {
        logger.log("ERROR: Failed to forward Kinesis records to destination stream: " + e.getMessage());
        return;
    }
}
 

/**
    * @see com.amazonaws.services.lambda.runtime.RequestHandler#handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context)
    */
   public Void handleRequestWithLists(KinesisEvent event, Context context) {
	LambdaLogger logger = context.getLogger();
	logger.log("Received " + event.getRecords().size() + " raw Event Records.");

	try {
		// process the user records with an anonymous record processor
		// instance
		RecordDeaggregator.processRecords(event.getRecords(), new KinesisUserRecordProcessor() {
			public Void process(List<UserRecord> userRecords) {
				for (UserRecord userRecord : userRecords) {
					// Your User Record Processing Code Here!
					logger.log(new String(userRecord.getData().array()));
				}

				return null;
			}
		});
	} catch (Exception e) {
		logger.log(e.getMessage());
	}

	return null;
}
 

/**
    * @see com.amazonaws.services.lambda.runtime.RequestHandler#handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context)
    */
   public Void handleRequestBulkList(KinesisEvent event, Context context) {
	LambdaLogger logger = context.getLogger();
	logger.log("Received " + event.getRecords().size() + " raw Event Records.");

	try {
		List<UserRecord> userRecords = RecordDeaggregator.deaggregate(event.getRecords());
		for (UserRecord userRecord : userRecords) {
			// Your User Record Processing Code Here!
			logger.log(new String(userRecord.getData().array()));
		}
	} catch (Exception e) {
		logger.log(e.getMessage());
	}

	return null;
}
 

/**
 * @see com.amazonaws.services.lambda.runtime.RequestHandler#handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context)
 */
   public Void handleRequest(KinesisEvent event, Context context) {
	LambdaLogger logger = context.getLogger();
	logger.log("Received " + event.getRecords().size() + " raw Event Records.");

	// Stream the User Records from the Lambda Event
	RecordDeaggregator.stream(event.getRecords().stream(), userRecord -> {
		// Your User Record Processing Code Here!
		logger.log(new String(userRecord.getData().array()));
	});

	return null;
}
 

@Override
public String handleRequest(String event, Context context) {

    PersistCase perCase = new PersistCase();

    LambdaLogger logger = context.getLogger();
    String val = event ;
   logger.log("CASE is about to be assigned " +val);

   // Create very simple logic to assign case to an employee
    int tmp = (Math.random() <= 0.5) ? 1 : 2;

    logger.log("TMP IS " +tmp);

    String emailEmp= "";

    if (tmp == 1) {
        // assign to tblue
        emailEmp = "[email protected]";
        perCase.putRecord(val, "Tom Blue", emailEmp );
    } else {
        // assign to swhite
        emailEmp = "[email protected]";
        perCase.putRecord(val, "Sarah White", emailEmp);
    }

    logger.log("emailEmp IS " +emailEmp);
    //return email - used in the next step
    return emailEmp;
    }
 

@Override
public String handleRequest(Map<String,String> event, Context context) {
    LambdaLogger logger = context.getLogger();
    Gson gson = new GsonBuilder().create();

    // log execution details
    logger.log("ENVIRONMENT VARIABLES: " + gson.toJson(System.getenv()));
    logger.log("CONTEXT: " + gson.toJson(context));
    // process event
    logger.log("EVENT Data: " + gson.toJson(event));

    String myCaseID = event.get("inputCaseID");
    logger.log("CaseId44: " + myCaseID);
    return myCaseID;
}
 

@Override
public String handleRequest(SNSEvent event, Context context) {

   String message = event.getRecords().get(0).getSNS().getMessage();
   LambdaLogger logger = context.getLogger(); 

   // Parse SNS event for analysis results. Log results
   try {
      ObjectMapper operationResultMapper = new ObjectMapper();
      JsonNode jsonResultTree = operationResultMapper.readTree(message);
      logger.log("Rekognition Video Operation:=========================");
      logger.log("Job id: " + jsonResultTree.get("JobId"));
      logger.log("Status : " + jsonResultTree.get("Status"));
      logger.log("Job tag : " + jsonResultTree.get("JobTag"));
      logger.log("Operation : " + jsonResultTree.get("API"));

      if (jsonResultTree.get("API").asText().equals("StartLabelDetection")) {

         if (jsonResultTree.get("Status").asText().equals("SUCCEEDED")){
            GetResultsLabels(jsonResultTree.get("JobId").asText(), context);
         }
         else{
            String errorMessage = "Video analysis failed for job " 
                  + jsonResultTree.get("JobId") 
                  + "State " + jsonResultTree.get("Status");
            throw new Exception(errorMessage); 
         }

      } else
         logger.log("Operation not StartLabelDetection");

   } catch (Exception e) {
      logger.log("Error: " + e.getMessage());
      throw new RuntimeException (e);


   }

   return message;
}
 

@Override
public void handleRequest(InputStream inputStream,
                          OutputStream outputStream,
                          Context context) throws IOException {
  BufferedReader reader = new BufferedReader(
          new InputStreamReader(inputStream));
  JSONObject awsResponse = new JSONObject();
  LambdaLogger logger = context.getLogger();
  try {
    JSONObject awsRequest = (JSONObject) parser.parse(reader);
    JSONObject headers = (JSONObject) awsRequest.get("headers");
    String body = (String) awsRequest.get("body");
    logger.log("AWS request body = " + body);

    actionsApp.handleRequest(body, headers)
            .thenAccept((webhookResponseJson) -> {
              logger.log("Generated json = " + webhookResponseJson);

              JSONObject responseHeaders = new JSONObject();
              responseHeaders.put("Content-Type", "application/json");

              awsResponse.put("statusCode", "200");
              awsResponse.put("headers", responseHeaders);
              awsResponse.put("body", webhookResponseJson);
              writeResponse(outputStream, awsResponse);
            }).exceptionally((throwable -> {
      awsResponse.put("statusCode", "500");
      awsResponse.put("exception", throwable);
      writeResponse(outputStream, awsResponse);
      return null;
    }));

  } catch (ParseException e) {
    e.printStackTrace();
  }
}
 

@Override
public final Boolean processEvent(final SQSEvent event, final String outputQueueURL, final LambdaLogger logger) {

    try {

        logger.log("Number of messages in event: " + event.getRecords().size());

        logger.log("Output Queue URL: " + outputQueueURL);

        Collection<SendMessageBatchRequestEntry> entries = new ArrayList<>();

        int idVal = 1;
        for (SQSMessage m : event.getRecords()) {
            logger.log("Adding message: " + m.getBody());
            entries.add(new SendMessageBatchRequestEntry("id_" + idVal, m.getBody()));
            idVal++;
        }

        final SendMessageBatchRequest sendBatchRequest = new SendMessageBatchRequest()
                .withQueueUrl(outputQueueURL)
                .withEntries(entries);
        this.sqsClient.sendMessageBatch(sendBatchRequest);

    } catch (Exception e) {
        final String errorMessage = "Error occurred: " + e.getMessage();
        logger.log(errorMessage);
        return false;
    }

    return true;

}
 

@Override
public void handleRequest(InputStream is, OutputStream os, Context context) throws IOException {
    LambdaLogger logger = context.getLogger();
    String input = Utils.toString(is);
    try {
        Request request = GSON.fromJson(input, Request.class);
        String base64Img = request.getImageData().split(",")[1];
        byte[] imgBytes = Base64.getDecoder().decode(base64Img);
        Image img;
        try (ByteArrayInputStream bis = new ByteArrayInputStream(imgBytes)) {
            ImageFactory factory = ImageFactory.getInstance();
            img = factory.fromInputStream(bis);
        }

        Translator<Image, Classifications> translator =
                ImageClassificationTranslator.builder()
                        .addTransform(new ToTensor())
                        .optFlag(Image.Flag.GRAYSCALE)
                        .optApplySoftmax(true)
                        .build();
        Criteria<Image, Classifications> criteria =
                Criteria.builder()
                        .setTypes(Image.class, Classifications.class)
                        .optModelUrls(
                                "https://djl-ai.s3.amazonaws.com/resources/demo/pytorch/doodle_mobilenet.zip")
                        .optTranslator(translator)
                        .build();
        ZooModel<Image, Classifications> model = ModelZoo.loadModel(criteria);
        try (Predictor<Image, Classifications> predictor = model.newPredictor()) {
            List<Classifications.Classification> result = predictor.predict(img).topK(5);
            os.write(GSON.toJson(result).getBytes(StandardCharsets.UTF_8));
        }
    } catch (RuntimeException | ModelException | TranslateException e) {
        logger.log("Failed handle input: " + input);
        logger.log(e.toString());
        String msg = "{\"status\": \"invoke failed: " + e.toString() + "\"}";
        os.write(msg.getBytes(StandardCharsets.UTF_8));
    }
}
 

@Override
public void handleRequest(InputStream is, OutputStream os, Context context) throws IOException {
    LambdaLogger logger = context.getLogger();
    String input = Utils.toString(is);
    try {
        Request request = GSON.fromJson(input, Request.class);
        String url = request.getInputImageUrl();
        String artifactId = request.getArtifactId();
        Map<String, String> filters = request.getFilters();
        Criteria<Image, Classifications> criteria =
                Criteria.builder()
                        .setTypes(Image.class, Classifications.class)
                        .optArtifactId(artifactId)
                        .optFilters(filters)
                        .build();
        try (ZooModel<Image, Classifications> model = ModelZoo.loadModel(criteria);
                Predictor<Image, Classifications> predictor = model.newPredictor()) {
            Image image = ImageFactory.getInstance().fromUrl(url);
            List<Classifications.Classification> result = predictor.predict(image).topK(5);
            os.write(GSON.toJson(result).getBytes(StandardCharsets.UTF_8));
        }
    } catch (RuntimeException | ModelException | TranslateException e) {
        logger.log("Failed handle input: " + input);
        logger.log(e.toString());
        String msg = "{\"status\": \"invoke failed: " + e.toString() + "\"}";
        os.write(msg.getBytes(StandardCharsets.UTF_8));
    }
}
 

@Override
public final Response addRecords(final Request request, final LambdaLogger logger) {

    this.documentAddedCount = request.getCount();

    DescribeStreamResult result = this.kinesisClient.describeStream(request.getStreamName());
    logger.log("Stream Status: " + result.getStreamDescription().getStreamStatus() + ". ");

    logger.log("Adding records to Stream...");

    String payload;

    for (int i = 1; i <= request.getCount(); i++) {

        payload = request.getPayload() + i;

        this.kinesisBatch.add(new PutRecordsRequestEntry()
                .withPartitionKey(request.getPartitionKey())
                .withData(ByteBuffer.wrap(payload.getBytes())));

        if (this.kinesisBatch.size() >= request.getBatchSize()) {

            try {
                logger.log("Flushing records to Stream...");
                flushBatch(request.getStreamName(), logger);
            } catch (Exception e) {
                logger.log("Exception occurred: " + e);
                this.isError = false;
            } finally {
                this.kinesisBatch.clear();
            }
        }

    }

    if (this.isError) {
        return new Response(ERROR_MESSAGE, documentAddedCount);
    } else {
        return new Response(SUCCESS_MESSAGE, documentAddedCount);
    }
}
 

void GetResultsLabels(String startJobId, Context context) throws Exception {

      LambdaLogger logger = context.getLogger();

      AmazonRekognition rek = AmazonRekognitionClientBuilder.standard().withRegion(Regions.US_EAST_1).build();

      int maxResults = 1000;
      String paginationToken = null;
      GetLabelDetectionResult labelDetectionResult = null;
      String labels = "";
      Integer labelsCount = 0;
      String label = "";
      String currentLabel = "";
     
      //Get label detection results and log them. 
      do {

         GetLabelDetectionRequest labelDetectionRequest = new GetLabelDetectionRequest().withJobId(startJobId)
               .withSortBy(LabelDetectionSortBy.NAME).withMaxResults(maxResults).withNextToken(paginationToken);

         labelDetectionResult = rek.getLabelDetection(labelDetectionRequest);
         
         paginationToken = labelDetectionResult.getNextToken();
         VideoMetadata videoMetaData = labelDetectionResult.getVideoMetadata();

         // Add labels to log
         List<LabelDetection> detectedLabels = labelDetectionResult.getLabels();
         
         for (LabelDetection detectedLabel : detectedLabels) {
            label = detectedLabel.getLabel().getName();
            if (label.equals(currentLabel)) {
               continue;
            }
            labels = labels + label + " / ";
            currentLabel = label;
            labelsCount++;

         }
      } while (labelDetectionResult != null && labelDetectionResult.getNextToken() != null);

      logger.log("Total number of labels : " + labelsCount);
      logger.log("labels : " + labels);

   }
 

public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {

        LambdaLogger logger = context.getLogger();
        logger.log("Loading Java Lambda handler of ProxyWithStream");


        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        JSONObject responseJson = new JSONObject();
        String responseCode = "200";
        String action = "";

        try {
            JSONObject event = (JSONObject) parser.parse(reader);

            if (event.get("pathParameters") != null) {
                JSONObject pps = (JSONObject) event.get("pathParameters");
                if (pps.get("ring-action") != null) {
                    action = (String) pps.get("ring-action");
                }
            }

            RingInput input = new RingInput();
            if (event.get("body") != null) {
                JSONObject body = (JSONObject) parser.parse((String) event.get("body"));
                if (body.get("user") != null) {
                    input.setUser((String) body.get("user"));
                }

                if (body.get("password") != null) {
                    input.setPassword((String) body.get("password"));
                }

                if (body.get("locationId") != null) {
                    input.setLocationId((String) body.get("locationId"));
                }

                if (body.get("zid") != null) {
                    input.setZid((String) body.get("zid"));
                }

            }

            JSONObject responseBody = new JSONObject();

            switch (action) {
                case "home":
                    setHome(input, responseBody);
                    break;
                case "away":
                    setAway(input, responseBody);
                    break;
                case "off":
                    disArmMode(input, responseBody);
                    break;
                case "status":
                    getMode(input, responseBody);
                    break;
                default:
                    responseBody.put("message", "Unknown");
            }

            responseJson.put("isBase64Encoded", false);
            responseJson.put("statusCode", responseCode);
            responseJson.put("body", responseBody.toString());

        } catch (ParseException pex) {
            responseJson.put("statusCode", "400");
            responseJson.put("exception", pex);
        }

        logger.log(responseJson.toJSONString());
        OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
        writer.write(responseJson.toJSONString());
        writer.close();
    }