New Feature -- Eureka Integration to Hystrix Dashbaord

hystrix-dashboard/build.gradle

@@ -6,8 +6,10 @@ dependencies {
     compile 'org.apache.httpcomponents:httpclient:4.2.1'
     compile 'log4j:log4j:1.2.17'
     compile 'org.slf4j:slf4j-log4j12:1.7.0'
+    compile 'commons-io:commons-io:2.5'
+    testCompile 'junit:junit:4.12'
 }
 
 jettyRun {
-        httpPort = 7979
+   httpPort = 7979
 }

hystrix-dashboard/src/main/java/com/netflix/hystrix/dashboard/stream/EurekaInfoServlet.java

@@ -0,0 +1,53 @@
+package com.netflix.hystrix.dashboard.stream;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.io.IOUtils;
+
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Servlet that calls eureka REST api in order to get instances information. <BR>
+ * You need provide a url parameter. i.e: eureka?url=http://127.0.0.1:8080/eureka/v2/apps
+ * 
+ * @author diegopacheco
+ *
+ */
+public class EurekaInfoServlet extends HttpServlet {
+
+	 private static final long serialVersionUID = 1L;
+
+	 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+		 String uri = request.getParameter("url");
+		 if (uri==null || "".equals(uri)) response.getOutputStream().write("Error. You need supply a valid eureka URL ".getBytes()); 
+
+		 try{
+			 response.setContentType("application/xml");
+			 response.setHeader("Content-Encoding", "gzip");
+			 IOUtils.copy( UrlUtils.readXmlInputStream(uri) ,response.getOutputStream());
+		 }catch(Exception e){
+			 response.getOutputStream().write(("Error. You need supply a valid eureka URL. Ex: " + e + "").getBytes()); 
+		 }
+
+	 }
+}

hystrix-dashboard/src/main/java/com/netflix/hystrix/dashboard/stream/UrlUtils.java

@@ -0,0 +1,47 @@
+package com.netflix.hystrix.dashboard.stream;
+
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * Utility class to work with InputStreams
+ * 
+ * @author diegopacheco
+ *
+ */
+public class UrlUtils {
+
+	public static InputStream readXmlInputStream(String uri){
+
+		if (uri==null || "".equals(uri)) throw new IllegalArgumentException("Invalid uri. URI cannot be null or blank. ");	
+
+		try{
+			 URL url = new URL(uri);
+			 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+			 connection.setRequestMethod("GET");
+			 connection.setRequestProperty("Accept", "application/xml");
+
+			 return connection.getInputStream();
+
+		}catch(Exception e){
+			throw new RuntimeException(e);
+		}
+	}
+
+}

hystrix-dashboard/src/main/test/com/netflix/hystrix/dashboard/stream/UrlUtilsTest.java

@@ -0,0 +1,38 @@
+package com.netflix.hystrix.dashboard.stream;
+
+import org.junit.Test;
+
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * UrlUtilsTest unit tests
+ * 
+ * @author diegopacheco
+ *
+ */
+public class UrlUtilsTest {
+
+	@Test(expected=IllegalArgumentException.class)
+	public void testReadXmlInputStreamWithNull() {
+		UrlUtils.readXmlInputStream(null);
+	}
+
+	@Test(expected=IllegalArgumentException.class)
+	public void testReadXmlInputStreamWithBlank() {
+		UrlUtils.readXmlInputStream("");
+	}
+
+}

hystrix-dashboard/src/main/webapp/WEB-INF/web.xml

@@ -26,5 +26,16 @@
 		<servlet-name>ProxyStreamServlet</servlet-name>
 		<url-pattern>/proxy.stream</url-pattern>
 	</servlet-mapping>
+
+	<servlet>
+		<description />
+		<display-name>EurekaInfoServlet</display-name>
+		<servlet-name>EurekaInfoServlet</servlet-name>
+		<servlet-class>com.netflix.hystrix.dashboard.stream.EurekaInfoServlet</servlet-class>
+	</servlet>
+	<servlet-mapping>
+		<servlet-name>EurekaInfoServlet</servlet-name>
+		<url-pattern>/eureka</url-pattern>
+	</servlet-mapping>
 
 </web-app>

hystrix-dashboard/src/main/webapp/index.html

@@ -46,6 +46,39 @@
 				}
 			});
 		});
+
+		$(document).ready(function(){
+
+				$('#eurekaURL').on('input',function(e){
+					url = window.location.pathname + "eureka?url=" + $('#eurekaURL').val()
+					$.get(url,function( data ) {
+
+				   		$(data.children).find("application").each(function(index,item){
+					   	  appName = $(item).find("name")[0].innerHTML
+
+					   	  ip = null;
+						  $($(item).find("instance")).each(function(i,d){
+						  	 ip = $(d).find("ipAddr")[0].innerHTML;	
+						  });
+
+					   	  $('#eurekaApp').append($("<option></option>")
+					                    .attr("value",ip)
+					                    .text(appName)); 
+
+					      $('#eurekaApp').on('change click',function(item){
+					          var $this = $(this),
+					          $value = $this.val();
+					          streamType = $('input[name=streamType]:checked').val()
+					          $('#stream').val("http://" + $value +  ":8080/" + streamType + "?cluster=default");
+					      });
+
+					   });
+					});		
+
+				});
+
+	 	});
+
 	</script>
 </head>
 <body>
@@ -57,6 +90,18 @@
 	<br>
 
 	<h2>Hystrix Dashboard</h2>
+
+	Eureka URL: <input id="eurekaURL" name="eurekaURL" class="eurekaURL" type="text" size="42" placeholder="http://hostname:8080/eureka/v2/apps"> <br>
+
+	Eureka Application: 
+	<select id="eurekaApp" name="eurekaApp" class="eurekaApp">
+		<option selected disabled>Choose here</option>
+	</select> 
+
+	Stream Type:
+	Hystrix <input type="radio" name="streamType" value="hystrix.stream"> 
+	Turbine <input type="radio" name="streamType" value="turbine.stream" checked> <br><br>
+
 	<input id="stream" type="textfield" size="120" placeholder="http://hostname:port/turbine/turbine.stream"></input>
 	<br><br>
 	<i>Cluster via Turbine (default cluster):</i> http://turbine-hostname:port/turbine.stream