1 files changed, 54 insertions, 0 deletions
diff --git a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/http/PrometheusApiServer.kt b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/http/PrometheusApiServer.kt
new file mode 100644
index 00000000..29a17fc1
--- /dev/null
+++ b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/http/PrometheusApiServer.kt
@@ -0,0 +1,54 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2019 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.kafkaconsumer.metrics.http
+
+import org.onap.dcae.collectors.veshv.kafkaconsumer.metrics.MicrometerMetrics
+import org.onap.dcae.collectors.veshv.utils.NettyServerHandle
+import org.onap.dcae.collectors.veshv.utils.ServerHandle
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import reactor.core.publisher.Mono
+import reactor.netty.http.server.HttpServer
+import reactor.netty.http.server.HttpServerRequest
+import reactor.netty.http.server.HttpServerResponse
+import java.net.InetSocketAddress
+
+internal class PrometheusApiServer(private val listenAddress: InetSocketAddress,
+                                   private val metrics: MicrometerMetrics) {
+
+    private val logger = Logger(PrometheusApiServer::class)
+
+    fun start(): Mono<NettyServerHandle> =
+            HttpServer.create()
+                    .tcpConfiguration { it.addressSupplier { listenAddress } }
+                    .route { it.get("/monitoring/prometheus", ::metricsHandler) }
+                    .bind()
+                    .map { NettyServerHandle(it) }
+                    .doOnSuccess(::logServerStarted)
+
+
+    private fun metricsHandler(_req: HttpServerRequest, resp: HttpServerResponse) =
+            resp.sendString(metrics.lastStatus())
+
+
+    private fun logServerStarted(handle: ServerHandle) =
+            logger.info {
+                "Kafka Consumer API server is up and listening on ${handle.host}:${handle.port}"
+            }
+}