java – Dropwizard不会将自定义记录器记录到文件中

我遇到了同样的问题,尝试使用单独的文件设置Dropwizard(0.8.4).我遇到了同样的问题.所以我挖得更深一些,为我找到了一个解决方案(不是最干净但我似乎无法以不同的方式工作).

问题是LoggingFactory #configure会自动将每个appender添加到root.这不是很理想,所以需要覆盖.我做的是：

>覆盖LoggingFactory.

这有点凌乱,因为有一些事情需要悲伤地复制:(这是我的实现：

import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.util.Map;

import javax.management.InstanceAlreadyExistsException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;

import org.slf4j.LoggerFactory;
import org.slf4j.bridge.SLF4JBridgeHandler;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.logback.InstrumentedAppender;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableMap;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.PatternLayout;
import ch.qos.logback.classic.jmx.JMXConfigurator;
import ch.qos.logback.classic.jul.LevelChangePropagator;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.Appender;
import ch.qos.logback.core.util.StatusPrinter;
import io.dropwizard.logging.AppenderFactory;
import io.dropwizard.logging.LoggingFactory;

public class BetterDropWizardLoggingConfig extends LoggingFactory {

    @JsonIgnore
    final LoggerContext loggerContext;

    @JsonIgnore
    final PrintStream configurationErrorsStream;

    @JsonProperty("loggerMapping")
    private ImmutableMap<String,String> loggerMappings;

    private static void hijackJDKLogging() {
        SLF4JBridgeHandler.removeHandlersForRootLogger();
        SLF4JBridgeHandler.install();
    }

    public BetterDropWizardLoggingConfig() {
        PatternLayout.defaultConverterMap.put("h",HostNameConverter.class.getName());
        this.loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
        this.configurationErrorsStream = System.err;
    }

    private Logger configureLevels() {
        final Logger root = loggerContext.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
        loggerContext.reset();

        final LevelChangePropagator propagator = new LevelChangePropagator();
        propagator.setContext(loggerContext);
        propagator.setResetJUL(true);

        loggerContext.addListener(propagator);

        root.setLevel(getLevel());

        for (Map.Entry<String,Level> entry : getLoggers().entrySet()) {
            loggerContext.getLogger(entry.getKey()).setLevel(entry.getValue());
        }

        return root;
    }

    @Override
    public void configure(MetricRegistry metricRegistry,String name) {
        hijackJDKLogging();

        final Logger root = configureLevels();

        for (AppenderFactory output : getAppenders()) {
            Appender<ILoggingEvent> build = output.build(loggerContext,name,null);
            if(output instanceof MappedLogger && ((MappedLogger) output).getLoggerName() != null) {
                String appenderName = ((MappedLogger) output).getLoggerName();
                String loggerName = loggerMappings.get(appenderName);
                Logger logger = this.loggerContext.getLogger(loggerName);
                logger.addAppender(build);
            } else {
                root.addAppender(build);
            }
        }

        StatusPrinter.setPrintStream(configurationErrorsStream);
        try {
            StatusPrinter.printIfErrorsOccured(loggerContext);
        } finally {
            StatusPrinter.setPrintStream(System.out);
        }

        final MBeanServer server = ManagementFactory.getPlatformMBeanServer();
        try {
            final ObjectName objectName = new ObjectName("io.dropwizard:type=Logging");
            if (!server.isRegistered(objectName)) {
                server.registerMBean(new JMXConfigurator(loggerContext,server,objectName),objectName);
            }
        } catch (MalformedObjectNameException | InstanceAlreadyExistsException | NotCompliantMBeanException
                | MBeanRegistrationException e) {
            throw new RuntimeException(e);
        }

        configureInstrumentation(root,metricRegistry);
    }

    private void configureInstrumentation(Logger root,MetricRegistry metricRegistry) {
        final InstrumentedAppender appender = new InstrumentedAppender(metricRegistry);
        appender.setContext(loggerContext);
        appender.start();
        root.addAppender(appender);
    }

}

你可以这么做,我不得不复制/粘贴一些私有成员和方法,以使事情按预期工作.

我添加了一个新字段：

@JsonProperty("loggerMapping")
private ImmutableMap<String,String> loggerMappings;

这允许我为每个记录器配置映射.这不是开箱即用的,因为我无法得到一个名字(dropwizard默认的appender名称,非常不方便……)

所以我添加了一个新的Logger,在我的例子中也进行了主机名替换,这是我出于不同的原因所需要的.为此,我覆盖了旧的FileAppenderFactory并实现了我自己的MappedLogger接口.在这里实施：

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.FileAppender;
import ch.qos.logback.core.rolling.RollingFileAppender;
import io.dropwizard.logging.AppenderFactory;
import io.dropwizard.logging.FileAppenderFactory;

@JsonTypeName("hostnameFile")
public class HostnameFileAppender extends FileAppenderFactory implements AppenderFactory,MappedLogger {

    private static String uuid = UUID.randomUUID().toString();

    @JsonProperty
    private String name;

    public void setCurrentLogFilename(String currentLogFilename) {
        super.setCurrentLogFilename(substitute(currentLogFilename));
    }

    private String substitute(final String pattern) {
        String substitute = null;

        try {
            substitute = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            System.err.println("Failed to get local hostname:");
            e.printStackTrace(System.err);
            substitute = uuid;
            System.err.println("Using " + substitute + " as fallback.");
        }
        return pattern.replace("${HOSTNAME}",substitute);
    }

    @Override
    public void setArchivedLogFilenamePattern(String archivedLogFilenamePattern) {
        super.setArchivedLogFilenamePattern(substitute(archivedLogFilenamePattern));
    }

    @Override
    public String getLoggerName() {
        return name;
    }
}

请注意,为了添加新的json类型,您必须遵循AppenderFactory中的JavaDoc(将Meta-inf添加到类路径并使新的appender可被发现)

到目前为止,我们现在有了一个可以接收记录器映射的配置,我们有一个可以选择名称的记录器.

在配置方法中,我现在将这两者结合在一起：

for (AppenderFactory output : getAppenders()) {
        Appender<ILoggingEvent> build = output.build(loggerContext,null);
        if(output instanceof MappedLogger && ((MappedLogger) output).getLoggerName() != null) {
            String appenderName = ((MappedLogger) output).getLoggerName();
            String loggerName = loggerMappings.get(appenderName);
            Logger logger = this.loggerContext.getLogger(loggerName);
            logger.addAppender(build);
        } else {
            root.addAppender(build);
        }
    }

为了向后兼容,我保留了默认行为.如果没有定义名称,则appender将添加到根记录器中.否则我解析输入的记录器并根据需要添加appender.

最后但并非最不重要的是旧的yaml配置：

logging:
  # The default level of all loggers. Can be OFF,ERROR,WARN,INFO,DEBUG,TRACE,or ALL.
  level: INFO

  loggers:
    "EVENT" : INFO

  loggerMapping:
    # for easier search this is defined as: appenderName -> loggerName rather than the other way around
    "eventLog" : "EVENT"

  appenders:
   - type: console   
     threshold: ALL
     logFormat: "myformat"

   - type: hostnameFile # NOTE THE NEW TYPE WITH HOSTNAME RESOLVE
     currentLogFilename: /Users/artur/tmp/log/my-${HOSTNAME}.log
     threshold: ALL
     archive: true
     archivedLogFilenamePattern: mypattern
     archivedFileCount: 31
     timeZone: UTC
     logFormat: "myFormat"

   - type: hostnameFile
     name: eventLog # NOTE THE APPENDER NAME
     currentLogFilename: something
     threshold: ALL
     archive: true
     archivedLogFilenamePattern: something
     archivedFileCount: 31
     timeZone: UTC
     logFormat: "myFormat"

   - type: hostnameFile
     currentLogFilename: something
     threshold: ERROR
     archive: true
     archivedLogFilenamePattern: something
     archivedFileCount: 31
     timeZone: UTC
     logFormat: "myFormat"

如您所见,我将事件appender映射到事件记录器.这样我的所有事件都会在文件A中结束,而其他信息最终会在其他地方结束.

我希望这有帮助.可能不是最干净的解决方案,但我不认为Dropwizard目前允许此功能.