add emitting request logger

client/src/main/java/com/metamx/druid/QueryableNode.java

@@ -246,7 +246,20 @@ public abstract class QueryableNode<T extends QueryableNode> extends Registering
   {
     if (requestLogger == null) {
       try {
-        setRequestLogger(Initialization.makeRequestLogger(getJsonMapper(), getScheduledExecutorFactory(), getProps()));
+        final String loggingType = props.getProperty("druid.request.logging.type");
+        if(loggingType.equals("emitter")) {
+          setRequestLogger(Initialization.makeEmittingRequestLogger(
+            getProps(),
+            getEmitter()
+          ));
+        }
+        else {
+          setRequestLogger(Initialization.makeFileRequestLogger(
+            getJsonMapper(),
+            getScheduledExecutorFactory(),
+            getProps()
+          ));
+        }
       }
       catch (IOException e) {
         throw Throwables.propagate(e);

client/src/main/java/com/metamx/druid/http/EmittingRequestLogger.java

@@ -0,0 +1,97 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2013  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package com.metamx.druid.http;
+
+import com.google.common.collect.ImmutableMap;
+import com.metamx.emitter.core.Emitter;
+import com.metamx.emitter.core.Event;
+import org.joda.time.DateTime;
+
+import java.util.Map;
+
+public class EmittingRequestLogger implements RequestLogger
+{
+
+  final String service;
+  final String host;
+  final Emitter emitter;
+  final String feed;
+
+  public EmittingRequestLogger(String service, String host, Emitter emitter, String feed)
+  {
+    this.emitter = emitter;
+    this.host = host;
+    this.service = service;
+    this.feed = feed;
+  }
+
+  @Override
+  public void log(final RequestLogLine requestLogLine) throws Exception
+  {
+    emitter.emit(new RequestLogEvent(service, host, feed, requestLogLine));
+  }
+
+  public static class RequestLogEvent implements Event
+  {
+    final String service;
+    final String host;
+    final String feed;
+    final RequestLogLine request;
+
+    public RequestLogEvent(String service, String host, String feed, RequestLogLine request)
+    {
+      this.service = service;
+      this.host = host;
+      this.request = request;
+      this.feed = feed;
+    }
+
+    @Override
+    public Map<String, Object> toMap()
+    {
+      return ImmutableMap.<String, Object>builder()
+              .put("feed", getFeed())
+              .put("timestamp", request.getTimestamp())
+              .put("service", service)
+              .put("host", host)
+              .put("query", request.getQuery())
+              .put("remoteAddr", request.getRemoteAddr())
+              .build();
+    }
+
+    @Override
+    public String getFeed()
+    {
+      return feed;
+    }
+
+    @Override
+    public DateTime getCreatedTime()
+    {
+      return request.getTimestamp();
+    }
+
+    @Override
+    public boolean isSafeToBuffer()
+    {
+      return true;
+    }
+  }
+}

client/src/main/java/com/metamx/druid/http/RequestLogLine.java

@@ -19,6 +19,7 @@
 
 package com.metamx.druid.http;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Joiner;
@@ -52,4 +53,22 @@ public class RequestLogLine
         )
     );
   }
+
+  @JsonProperty("timestamp")
+  public DateTime getTimestamp()
+  {
+    return timestamp;
+  }
+
+  @JsonProperty("query")
+  public Query getQuery()
+  {
+    return query;
+  }
+
+  @JsonProperty("remoteAddr")
+  public String getRemoteAddr()
+  {
+    return remoteAddr;
+  }
 }

client/src/main/java/com/metamx/druid/initialization/Initialization.java

@@ -27,11 +27,13 @@ import com.metamx.common.concurrent.ScheduledExecutorFactory;
 import com.metamx.common.lifecycle.Lifecycle;
 import com.metamx.common.logger.Logger;
 import com.metamx.druid.client.ZKPhoneBook;
+import com.metamx.druid.http.EmittingRequestLogger;
 import com.metamx.druid.http.FileRequestLogger;
 import com.metamx.druid.http.RequestLogger;
 import com.metamx.druid.utils.PropUtils;
 import com.metamx.druid.zk.PropertiesZkSerializer;
 import com.metamx.druid.zk.StringZkSerializer;
+import com.metamx.emitter.core.Emitter;
 import com.netflix.curator.framework.CuratorFramework;
 import com.netflix.curator.framework.CuratorFrameworkFactory;
 import com.netflix.curator.retry.ExponentialBackoffRetry;
@@ -348,7 +350,11 @@ public class Initialization
     return serviceProvider;
   }
 
-  public static RequestLogger makeRequestLogger(ObjectMapper objectMapper, ScheduledExecutorFactory factory, Properties props) throws IOException
+  public static RequestLogger makeFileRequestLogger(
+    ObjectMapper objectMapper,
+    ScheduledExecutorFactory factory,
+    Properties props
+  ) throws IOException
   {
     return new FileRequestLogger(
         objectMapper,
@@ -357,6 +363,16 @@ public class Initialization
     );
   }
 
+  public static RequestLogger makeEmittingRequestLogger(Properties props, Emitter emitter)
+  {
+    return new EmittingRequestLogger(
+        PropUtils.getProperty(props, "druid.service"),
+        PropUtils.getProperty(props, "druid.host"),
+        emitter,
+        PropUtils.getProperty(props, "druid.request.logging.feed")
+    );
+  }
+
   public static String makePropPath(String basePath)
   {
     return String.format("%s/%s", basePath, PROP_SUBPATH);