Remove Ratpack dependency for HV-VES health checks

In order to minimize complexity and possibly improve performance (thread count)
reactor-netty should be used instead of Ratpack. Also reorganize code to
be more consistent and differentiated readiness and liveness endpoints
(for future use in K8s Pod definition).

As an example I've defined health check probe in docker-compose YAML.

Change-Id: I1b5ce3d685e7ae5b0515b2146ae4fa88b3b41186
Issue-ID: DCAEGEN2-705
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>

2 files changed, 47 insertions, 1 deletions

diff --git a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/Status.kt b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/Status.kt
index d20ffaca..081dd0da 100644
--- a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/Status.kt
+++ b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/Status.kt
@@ -23,7 +23,7 @@ package org.onap.dcae.collectors.veshv.utils.http
  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  * @since August 2018
  */
-class Status{
+class Status {
     companion object {
         const val OK = 200
         const val SERVICE_UNAVAILABLE = 503
diff --git a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt
new file mode 100644
index 00000000..bb924f27
--- /dev/null
+++ b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt
@@ -0,0 +1,46 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018 NOKIA
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.veshv.utils
+
+import arrow.effects.IO
+import reactor.ipc.netty.tcp.BlockingNettyContext
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
+ * @since August 2018
+ */
+abstract class ServerHandle(val host: String, val port: Int) {
+    abstract fun shutdown(): IO<Unit>
+    abstract fun await(): IO<Unit>
+}
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
+ * @since August 2018
+ */
+class NettyServerHandle(private val ctx: BlockingNettyContext) : ServerHandle(ctx.host, ctx.port) {
+    override fun shutdown() = IO {
+        ctx.shutdown()
+    }
+
+    override fun await() = IO<Unit> {
+        ctx.context.channel().closeFuture().sync()
+    }
+}