Интеграция журналов CloudWatch с Cloudhub Mule

В этом блоге я расскажу, как включить журналы AWS Cloudwatch для вашего приложения Mule CloudHub. Сервисы Cloudwatch Logs предоставляются AWS, чтобы вы могли лучше управлять своими журналами. Это относительно дешевле, чем спленк. Поскольку cloudhub автоматически пролонгирует журналы размером более 100 МБ, нам необходим механизм для более эффективного управления нашими журналами. Для этого мы создадим пользовательский appender, который будет отправлять логи в cloudwatch.

package com.javaroots.appenders;
 
import static java.util.Comparator.comparing;
import static java.util.stream.Collectors.toList;
 
import java.io.Serializable;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Formatter;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
 
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.status.StatusLogger;
 
import com.amazonaws.regions.Regions;
import com.amazonaws.services.logs.AWSLogs;
import com.amazonaws.services.logs.model.CreateLogGroupRequest;
import com.amazonaws.services.logs.model.CreateLogStreamRequest;
import com.amazonaws.services.logs.model.CreateLogStreamResult;
import com.amazonaws.services.logs.model.DataAlreadyAcceptedException;
import com.amazonaws.services.logs.model.DescribeLogGroupsRequest;
import com.amazonaws.services.logs.model.DescribeLogStreamsRequest;
import com.amazonaws.services.logs.model.InputLogEvent;
import com.amazonaws.services.logs.model.InvalidSequenceTokenException;
import com.amazonaws.services.logs.model.LogGroup;
import com.amazonaws.services.logs.model.LogStream;
import com.amazonaws.services.logs.model.PutLogEventsRequest;
import com.amazonaws.services.logs.model.PutLogEventsResult;
 
@Plugin(name = "CLOUDW", category = "Core", elementType = "appender", printObject = true)
public class CloudwatchAppender extends AbstractAppender {
  
 /**
  * 
  */
 private static final long serialVersionUID = 12321345L;
  
 private static Logger logger2 = LogManager.getLogger(CloudwatchAppender.class);
 
 private final Boolean DEBUG_MODE = System.getProperty("log4j.debug") != null;
 
    /**
     * Used to make sure that on close() our daemon thread isn't also trying to sendMessage()s
     */
    private Object sendMessagesLock = new Object();
 
    /**
     * The queue used to buffer log entries
     */
    private LinkedBlockingQueue loggingEventsQueue;
 
    /**
     * the AWS Cloudwatch Logs API client
     */
    private AWSLogs awsLogsClient;
 
    private AtomicReference lastSequenceToken = new AtomicReference<>();
 
    /**
     * The AWS Cloudwatch Log group name
     */
    private String logGroupName;
 
    /**
     * The AWS Cloudwatch Log stream name
     */
    private String logStreamName;
 
    /**
     * The queue / buffer size
     */
    private int queueLength = 1024;
 
    /**
     * The maximum number of log entries to send in one go to the AWS Cloudwatch Log service
     */
    private int messagesBatchSize = 128;
 
    private AtomicBoolean cloudwatchAppenderInitialised = new AtomicBoolean(false);
  
 
    private CloudwatchAppender(final String name,
                           final Layout layout,
                           final Filter filter,
                           final boolean ignoreExceptions,String logGroupName, 
                           String logStreamName,
                           Integer queueLength,
                           Integer messagesBatchSize) {
        super(name, filter, layout, ignoreExceptions);
        this.logGroupName = logGroupName;
        this.logStreamName = logStreamName;
        this.queueLength = queueLength;
        this.messagesBatchSize = messagesBatchSize;
        this.activateOptions();
    }
 
    @Override
    public void append(LogEvent event) {
      if (cloudwatchAppenderInitialised.get()) {
             loggingEventsQueue.offer(event);
         } else {
             // just do nothing
         }
    }
     
    public void activateOptions() {
        if (isBlank(logGroupName) || isBlank(logStreamName)) {
            logger2.error("Could not initialise CloudwatchAppender because either or both LogGroupName(" + logGroupName + ") and LogStreamName(" + logStreamName + ") are null or empty");
            this.stop();
        } else {
          //below lines work with aws version 1.9.40 for local build
          //this.awsLogsClient = new AWSLogsClient();
          //awsLogsClient.setRegion(Region.getRegion(Regions.AP_SOUTHEAST_2));
          this.awsLogsClient = com.amazonaws.services.logs.AWSLogsClientBuilder.standard().withRegion(Regions.AP_SOUTHEAST_2).build();
            loggingEventsQueue = new LinkedBlockingQueue<>(queueLength);
            try {
                initializeCloudwatchResources();
                initCloudwatchDaemon();
                cloudwatchAppenderInitialised.set(true);
            } catch (Exception e) {
                logger2.error("Could not initialise Cloudwatch Logs for LogGroupName: " + logGroupName + " and LogStreamName: " + logStreamName, e);
                if (DEBUG_MODE) {
                    System.err.println("Could not initialise Cloudwatch Logs for LogGroupName: " + logGroupName + " and LogStreamName: " + logStreamName);
                    e.printStackTrace();
                }
            }
        }
    }
     
    private void initCloudwatchDaemon() {
     Thread t = new Thread(() -> {
            while (true) {
                try {
                    if (loggingEventsQueue.size() > 0) {
                        sendMessages();
                    }
                    Thread.currentThread().sleep(20L);
                } catch (InterruptedException e) {
                    if (DEBUG_MODE) {
                        e.printStackTrace();
                    }
                }
            }
        });
     t.setName("CloudwatchThread");
     t.setDaemon(true);
     t.start();
    }
     
    private void sendMessages() {
        synchronized (sendMessagesLock) {
            LogEvent polledLoggingEvent;
            final Layout layout = getLayout();
            List loggingEvents = new ArrayList<>();
 
            try {
 
                while ((polledLoggingEvent = loggingEventsQueue.poll()) != null && loggingEvents.size() <= messagesBatchSize) {
                    loggingEvents.add(polledLoggingEvent);
                }
                List inputLogEvents = loggingEvents.stream()
                        .map(loggingEvent -> new InputLogEvent().withTimestamp(loggingEvent.getTimeMillis())
                          .withMessage
                          (
                            layout == null ?
                            loggingEvent.getMessage().getFormattedMessage():
                            new String(layout.toByteArray(loggingEvent), StandardCharsets.UTF_8)
                            )
                          )
                        .sorted(comparing(InputLogEvent::getTimestamp))
                        .collect(toList());
 
                if (!inputLogEvents.isEmpty()) {
 
                    PutLogEventsRequest putLogEventsRequest = new PutLogEventsRequest(
                            logGroupName,
                            logStreamName,
                            inputLogEvents);
 
                    try {
                        putLogEventsRequest.setSequenceToken(lastSequenceToken.get());
                        PutLogEventsResult result = awsLogsClient.putLogEvents(putLogEventsRequest);
                        lastSequenceToken.set(result.getNextSequenceToken());
                    } catch (DataAlreadyAcceptedException dataAlreadyAcceptedExcepted) {
                      
                        putLogEventsRequest.setSequenceToken(dataAlreadyAcceptedExcepted.getExpectedSequenceToken());
                        PutLogEventsResult result = awsLogsClient.putLogEvents(putLogEventsRequest);
                        lastSequenceToken.set(result.getNextSequenceToken());
                        if (DEBUG_MODE) {
                            dataAlreadyAcceptedExcepted.printStackTrace();
                        }
                    } catch (InvalidSequenceTokenException invalidSequenceTokenException) {
                        putLogEventsRequest.setSequenceToken(invalidSequenceTokenException.getExpectedSequenceToken());
                        PutLogEventsResult result = awsLogsClient.putLogEvents(putLogEventsRequest);
                        lastSequenceToken.set(result.getNextSequenceToken());
                        if (DEBUG_MODE) {
                            invalidSequenceTokenException.printStackTrace();
                        }
                    }
                }
            } catch (Exception e) {
                if (DEBUG_MODE) {
                 logger2.error(" error inserting cloudwatch:",e);
                    e.printStackTrace();
                }
            }
        }
    }
 
    private void initializeCloudwatchResources() {
 
        DescribeLogGroupsRequest describeLogGroupsRequest = new DescribeLogGroupsRequest();
        describeLogGroupsRequest.setLogGroupNamePrefix(logGroupName);
 
        Optional logGroupOptional = awsLogsClient
                .describeLogGroups(describeLogGroupsRequest)
                .getLogGroups()
                .stream()
                .filter(logGroup -> logGroup.getLogGroupName().equals(logGroupName))
                .findFirst();
 
        if (!logGroupOptional.isPresent()) {
            CreateLogGroupRequest createLogGroupRequest = new CreateLogGroupRequest().withLogGroupName(logGroupName);
            awsLogsClient.createLogGroup(createLogGroupRequest);
        }
 
        DescribeLogStreamsRequest describeLogStreamsRequest = new DescribeLogStreamsRequest().withLogGroupName(logGroupName).withLogStreamNamePrefix(logStreamName);
 
        Optional logStreamOptional = awsLogsClient
                .describeLogStreams(describeLogStreamsRequest)
                .getLogStreams()
                .stream()
                .filter(logStream -> logStream.getLogStreamName().equals(logStreamName))
                .findFirst();
        if (!logStreamOptional.isPresent()) {
            CreateLogStreamRequest createLogStreamRequest = new CreateLogStreamRequest().withLogGroupName(logGroupName).withLogStreamName(logStreamName);
            CreateLogStreamResult o = awsLogsClient.createLogStream(createLogStreamRequest);
        }
 
    }
     
    private boolean isBlank(String string) {
        return null == string || string.trim().length() == 0;
    }
    protected String getSimpleStacktraceAsString(final Throwable thrown) {
        final StringBuilder stackTraceBuilder = new StringBuilder();
        for (StackTraceElement stackTraceElement : thrown.getStackTrace()) {
            new Formatter(stackTraceBuilder).format("%s.%s(%s:%d)%n",
                    stackTraceElement.getClassName(),
                    stackTraceElement.getMethodName(),
                    stackTraceElement.getFileName(),
                    stackTraceElement.getLineNumber());
        }
        return stackTraceBuilder.toString();
    }
 
    @Override
    public void start() {
        super.start();
    }
 
    @Override
    public void stop() {
        super.stop();
        while (loggingEventsQueue != null && !loggingEventsQueue.isEmpty()) {
            this.sendMessages();
        }
    }
 
    @Override
    public String toString() {
        return CloudwatchAppender.class.getSimpleName() + "{"
                + "name=" + getName() + " loggroupName=" + logGroupName
                +" logstreamName=" + logStreamName;
                
    }
 
    @PluginFactory
    @SuppressWarnings("unused")
    public static CloudwatchAppender createCloudWatchAppender(
      @PluginAttribute(value = "queueLength" ) Integer queueLength,
                                                  @PluginElement("Layout") Layout layout,
                                                  @PluginAttribute(value = "logGroupName") String logGroupName,
                                                  @PluginAttribute(value = "logStreamName") String logStreamName,
                                                  @PluginAttribute(value = "name") String name,
                                                  @PluginAttribute(value = "ignoreExceptions", defaultBoolean = false) Boolean ignoreExceptions,
                                                   
                                                  @PluginAttribute(value = "messagesBatchSize") Integer messagesBatchSize)
    {
     return new CloudwatchAppender(name, layout, null, ignoreExceptions, logGroupName, logStreamName ,queueLength,messagesBatchSize);
    }
}

Мы добавляем зависимость в наш файл pom.xml.

<dependency>
   <groupId>com.amazonaws</groupId>
   <artifactId>aws-java-sdk-logs</artifactId>
   <!-- for local 3.8.5 we need to use this version cloudhub 3.8.5 has jackson 2.6.6 -->
   <!-- <version>1.9.40</version> -->
   <version>1.11.105</version>
   <exclusions>
    <exclusion>  <!-- declare the exclusion here -->
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j-1.2-api</artifactId>
    </exclusion>
    <exclusion>  <!-- declare the exclusion here -->
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-core</artifactId>
    </exclusion>
    <exclusion>  <!-- declare the exclusion here -->
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-databind</artifactId>
    </exclusion>
   </exclusions>
  </dependency>
  <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
  <dependency>
   <groupId>org.apache.logging.log4j</groupId>
   <artifactId>log4j-api</artifactId>
   <version>2.5</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
  <dependency>
   <groupId>org.apache.logging.log4j</groupId>
   <artifactId>log4j-core</artifactId>
   <version>2.5</version>
  </dependency>

Теперь нам нужно изменить наш log4j2.xml. также добавьте пользовательский app cloudwatch и CloudhubLogs, чтобы мы также могли получать логи на cloudhub.

<?xml version="1.0" encoding="utf-8"?>
<Configuration status="trace" packages="au.edu.vu.appenders,com.mulesoft.ch.logging.appender">
 
 <!--These are some of the loggers you can enable. 
     There are several more you can find in the documentation. 
        Besides this log4j configuration, you can also use Java VM environment variables
        to enable other logs like network (-Djavax.net.debug=ssl or all) and 
        Garbage Collector (-XX:+PrintGC). These will be append to the console, so you will 
        see them in the mule_ee.log file. -->
 
 
    <Appenders>
         <CLOUDW name="CloudW" logGroupName="test-log-stream"
        logStreamName="test44" messagesBatchSize="${sys:cloudwatch.msg.batch.size}" queueLength="${sys:cloudwatch.queue.length}">
   <PatternLayout pattern="%d [%t] %-5p %c - %m%n"/>
  </CLOUDW>
   
  <Log4J2CloudhubLogAppender name="CLOUDHUB"
                                   addressProvider="com.mulesoft.ch.logging.DefaultAggregatorAddressProvider"
                                   applicationContext="com.mulesoft.ch.logging.DefaultApplicationContext"
                                   appendRetryIntervalMs="${sys:logging.appendRetryInterval}"
                                   appendMaxAttempts="${sys:logging.appendMaxAttempts}"
                                   batchSendIntervalMs="${sys:logging.batchSendInterval}"
                                   batchMaxRecords="${sys:logging.batchMaxRecords}"
                                   memBufferMaxSize="${sys:logging.memBufferMaxSize}"
                                   journalMaxWriteBatchSize="${sys:logging.journalMaxBatchSize}"
                                   journalMaxFileSize="${sys:logging.journalMaxFileSize}"
                                   clientMaxPacketSize="${sys:logging.clientMaxPacketSize}"
                                   clientConnectTimeoutMs="${sys:logging.clientConnectTimeout}"
                                   clientSocketTimeoutMs="${sys:logging.clientSocketTimeout}"
                                   serverAddressPollIntervalMs="${sys:logging.serverAddressPollInterval}"
                                   serverHeartbeatSendIntervalMs="${sys:logging.serverHeartbeatSendIntervalMs}"
                                   statisticsPrintIntervalMs="${sys:logging.statisticsPrintIntervalMs}">
 
            <PatternLayout pattern="[%d{MM-dd HH:mm:ss}] %-5p %c{1} [%t] CUSTOM: %m%n"/>
        </Log4J2CloudhubLogAppender>
         
    </Appenders>
    <Loggers>
      
      
  <!-- Http Logger shows wire traffic on DEBUG -->
  <AsyncLogger name="org.mule.module.http.internal.HttpMessageLogger" level="WARN"/>
  
  <!-- JDBC Logger shows queries and parameters values on DEBUG -->
  <AsyncLogger name="com.mulesoft.mule.transport.jdbc" level="WARN"/>
     
        <!-- CXF is used heavily by Mule for web services -->
        <AsyncLogger name="org.apache.cxf" level="WARN"/>
 
        <!-- Apache Commons tend to make a lot of noise which can clutter the log-->
        <AsyncLogger name="org.apache" level="WARN"/>
 
        <!-- Reduce startup noise -->
        <AsyncLogger name="org.springframework.beans.factory" level="WARN"/>
 
        <!-- Mule classes -->
        <AsyncLogger name="org.mule" level="INFO"/>
        <AsyncLogger name="com.mulesoft" level="INFO"/>
 
        <!-- Reduce DM verbosity -->
        <AsyncLogger name="org.jetel" level="WARN"/>
        <AsyncLogger name="Tracking" level="WARN"/>
         
        <AsyncRoot level="INFO">
            <AppenderRef ref="CLOUDHUB" level="INFO"/>
            <AppenderRef ref="CloudW" level="INFO"/>
        </AsyncRoot>
    </Loggers>
</Configuration>

Наконец, нам нужно отключить логи cloudhub в менеджере времени исполнения cloudhub.

Это работает с CloudHub Mule Runtime версии 3.8.4. некоторые проблемы с версией cloudhub 3.8.5, когда он правильно инициализируется и отправляет журналы, но события и сообщения отсутствуют.

Опубликовано на Java Code Geeks с разрешения Абхишека Сомани, партнера нашей программы JCG. См. Оригинальную статью здесь: интеграция журналов CloudWatch с Cloudhub Mule

Мнения, высказанные участниками Java Code Geeks, являются их собственными.

Интеграция журналов CloudWatch с Cloudhub Mule

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