From 5c2e95b8bdf764d28413b12524c95100b355520d Mon Sep 17 00:00:00 2001
From: Spencer Gibb <spencer@gibb.us>
Date: Wed, 23 Nov 2016 21:05:50 -0700
Subject: [PATCH] initial gateway actuator endpoint

---
 pom.xml                                       |  1 +
 .../gateway/actuate/GatewayEndpoint.java      | 38 +++++++++++++++++++
 .../config/GatewayAutoConfiguration.java      | 15 ++++++++
 src/test/resources/application.yml            | 10 +++--
 4 files changed, 61 insertions(+), 3 deletions(-)
 create mode 100644 src/main/java/org/springframework/cloud/gateway/actuate/GatewayEndpoint.java

diff --git a/pom.xml b/pom.xml
index 64677e0f..f1a76d1d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -28,6 +28,7 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-actuator</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot.experimental</groupId>
diff --git a/src/main/java/org/springframework/cloud/gateway/actuate/GatewayEndpoint.java b/src/main/java/org/springframework/cloud/gateway/actuate/GatewayEndpoint.java
new file mode 100644
index 00000000..9cce4330
--- /dev/null
+++ b/src/main/java/org/springframework/cloud/gateway/actuate/GatewayEndpoint.java
@@ -0,0 +1,38 @@
+package org.springframework.cloud.gateway.actuate;
+
+import org.springframework.boot.actuate.endpoint.AbstractEndpoint;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.cloud.gateway.filter.GatewayFilter;
+import org.springframework.core.annotation.AnnotationAwareOrderComparator;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author Spencer Gibb
+ */
+@ConfigurationProperties(prefix = "endpoints.gateway")
+public class GatewayEndpoint extends AbstractEndpoint<Map<String, Object>> {
+	private List<GatewayFilter> filters;
+
+	public GatewayEndpoint(List<GatewayFilter> filters) {
+		super("gateway");
+		this.filters = filters;
+		AnnotationAwareOrderComparator.sort(this.filters);
+	}
+
+	@Override
+	public Map<String, Object> invoke() {
+		HashMap<String, Object> map = new HashMap<>();
+
+		ArrayList<String> filterNames = new ArrayList<>();
+		for (GatewayFilter filter : this.filters) {
+			filterNames.add(filter.getClass().getName());
+		}
+		map.put("filters", filterNames);
+
+		return map;
+	}
+}
diff --git a/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java b/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java
index 77a2a0fd..757520d6 100644
--- a/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java
+++ b/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java
@@ -1,7 +1,10 @@
 package org.springframework.cloud.gateway.config;
 
+import org.springframework.boot.actuate.endpoint.Endpoint;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cloud.gateway.actuate.GatewayEndpoint;
 import org.springframework.cloud.gateway.filter.GatewayFilter;
 import org.springframework.cloud.gateway.filter.RouteToUrlFilter;
 import org.springframework.cloud.gateway.handler.GatewayFilteringWebHandler;
@@ -13,6 +16,8 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.http.client.reactive.ReactorClientHttpConnector;
 import org.springframework.web.client.reactive.WebClient;
 
+import java.util.List;
+
 /**
  * @author Spencer Gibb
  */
@@ -56,4 +61,14 @@ public class GatewayAutoConfiguration {
 		return new GatewayHostHandlerMapping(properties, webHandler);
 	}
 
+	@Configuration
+	@ConditionalOnClass(Endpoint.class)
+	protected static class GatewayActuatorConfiguration {
+
+		@Bean
+		public GatewayEndpoint gatewayEndpoint(List<GatewayFilter> filters) {
+			return new GatewayEndpoint(filters);
+		}
+	}
+
 }
diff --git a/src/test/resources/application.yml b/src/test/resources/application.yml
index 75492dec..15207acf 100644
--- a/src/test/resources/application.yml
+++ b/src/test/resources/application.yml
@@ -6,12 +6,16 @@ spring:
   cloud:
     gateway:
       routes:
-        test1:
-          requestPath: /**
-          downstreamUrl: http://httpbin.org:80
+#        test1:
+#          requestPath: /**
+#          downstreamUrl: http://httpbin.org:80
         test2:
           requestHost: '**.example.org'
           downstreamUrl: http://httpbin.org:80
 logging:
   level:
     org.springframework.cloud.gateway: TRACE
+
+management:
+  context-path: /admin
+#  port: 8081