feat(echo/pubsub): Expose endpoint to query subscriptions. (#472)

gate-web/src/main/groovy/com/netflix/spinnaker/gate/controllers/PubsubSubscriptionController.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 Google, 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.
+ */
+
+package com.netflix.spinnaker.gate.controllers;
+
+import com.netflix.spinnaker.gate.services.PubsubSubscriptionService;
+import io.swagger.annotations.ApiOperation;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+public class PubsubSubscriptionController {
+
+  @Autowired
+  private PubsubSubscriptionService pubsubSubscriptionService;
+
+  @ApiOperation(value = "Retrieve the list of pub/sub subscriptions configured in Echo.")
+  @RequestMapping(value = "/pubsub/subscriptions", method = RequestMethod.GET)
+  List<String> all() {
+    return pubsubSubscriptionService.getPubsubSubscriptions();
+  }
+}

gate-web/src/main/groovy/com/netflix/spinnaker/gate/services/PubsubSubscriptionService.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017 Google, 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.
+ */
+
+package com.netflix.spinnaker.gate.services;
+
+import com.netflix.spinnaker.gate.services.internal.EchoService;
+import groovy.transform.CompileStatic;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+
+@CompileStatic
+@Component
+public class PubsubSubscriptionService {
+
+  @Autowired(required = false)
+  private EchoService echoService;
+
+  public List<String> getPubsubSubscriptions() {
+    if (echoService == null) {
+      throw new IllegalStateException("No Echo service available.");
+    }
+
+    return echoService.getPubsubSubscriptions();
+  }
+}

gate-web/src/main/groovy/com/netflix/spinnaker/gate/services/internal/EchoService.groovy

@@ -16,8 +16,8 @@
 
 package com.netflix.spinnaker.gate.services.internal
 
-import retrofit.http.*
 import retrofit.client.Response
+import retrofit.http.*
 
 interface EchoService {
 
@@ -38,4 +38,6 @@ interface EchoService {
   @GET("/validateCronExpression")
   Map validateCronExpression(@Query("cronExpression") String cronExpression)
 
+  @GET("/pubsub/subscriptions")
+  List<String> getPubsubSubscriptions()
 }