feat(canary-v2): adds canary judge endpoint (#441)

gate-web/src/main/groovy/com/netflix/spinnaker/gate/controllers/V2CanaryController.groovy

@@ -0,0 +1,38 @@
+/*
+ * 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.internal.KayentaService
+import io.swagger.annotations.ApiOperation
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestMethod
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@ConditionalOnExpression('${services.kayenta.enabled:false}')
+class V2CanaryController {
+  @Autowired
+  KayentaService kayentaService
+
+  @ApiOperation(value = "Retrieve a list of all configured canary judges")
+  @RequestMapping(value = "/v2/canaries/judges", method = RequestMethod.GET)
+  List listJudges() {
+    kayentaService.listJudges()
+  }
+}

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

@@ -34,4 +34,7 @@ interface KayentaService {
 
   @DELETE("/canaryConfig/{id}")
   Response deleteCanaryConfig(@Path("id") String id)
+
+  @GET("/judges")
+  List listJudges()
 }