1 files changed, 118 insertions, 0 deletions
diff --git a/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConfigurationProviderImpl.kt b/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConfigurationProviderImpl.kt
new file mode 100644
index 00000000..736f474a
--- /dev/null
+++ b/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConfigurationProviderImpl.kt
@@ -0,0 +1,118 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018-2019 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.impl.adapters
+
+import com.google.gson.JsonObject
+import org.onap.dcae.collectors.veshv.boundary.ConfigurationProvider
+import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
+import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
+import org.onap.dcae.collectors.veshv.model.CollectorConfiguration
+import org.onap.dcae.collectors.veshv.model.ConfigurationProviderParams
+import org.onap.dcae.collectors.veshv.model.ServiceContext
+import org.onap.dcae.collectors.veshv.model.routing
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import org.onap.dcae.collectors.veshv.utils.logging.onErrorLog
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient
+import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext
+import reactor.core.publisher.Flux
+import reactor.core.publisher.Mono
+import reactor.retry.Jitter
+import reactor.retry.Retry
+import java.time.Duration
+
+
+/**
+ * @author Jakub Dudycz <jakub.dudycz@nokia.com>
+ * @since May 2018
+ */
+internal class ConfigurationProviderImpl(private val cbsClientMono: Mono<CbsClient>,
+                                         private val firstRequestDelay: Duration,
+                                         private val requestInterval: Duration,
+                                         private val healthState: HealthState,
+                                         retrySpec: Retry<Any>
+
+) : ConfigurationProvider {
+    constructor(cbsClientMono: Mono<CbsClient>, params: ConfigurationProviderParams) : this(
+            cbsClientMono,
+            params.firstRequestDelay,
+            params.requestInterval,
+            HealthState.INSTANCE,
+            Retry.any<Any>()
+                    .retryMax(MAX_RETRIES)
+                    .fixedBackoff(params.requestInterval)
+                    .jitter(Jitter.random())
+    )
+
+    private val retry = retrySpec.doOnRetry {
+        logger.withWarn(ServiceContext::mdc) {
+            log("Exception from configuration provider client, retrying subscription", it.exception())
+        }
+        healthState.changeState(HealthDescription.RETRYING_FOR_DYNAMIC_CONFIGURATION)
+    }
+
+    override fun invoke(): Flux<CollectorConfiguration> =
+            cbsClientMono
+                    .doOnNext { logger.info(ServiceContext::mdc) { "CBS client successfully created" } }
+                    .onErrorLog(logger, ServiceContext::mdc) { "Failed to retrieve CBS client" }
+                    .retryWhen(retry)
+                    .doFinally { logger.trace(ServiceContext::mdc) { "CBS client subscription finished" } }
+                    .flatMapMany(::handleUpdates)
+
+    private fun handleUpdates(cbsClient: CbsClient): Flux<CollectorConfiguration> = cbsClient
+            .updates(RequestDiagnosticContext.create(),
+                    firstRequestDelay,
+                    requestInterval)
+            .doOnNext { logger.info(ServiceContext::mdc) { "Received new configuration:\n$it" } }
+            .map(::createCollectorConfiguration)
+            .onErrorLog(logger, ServiceContext::mdc) { "Error while creating configuration" }
+            .retryWhen(retry)
+
+
+    private fun createCollectorConfiguration(configuration: JsonObject): CollectorConfiguration =
+            try {
+                val routingArray = configuration.getAsJsonArray(ROUTING_CONFIGURATION_KEY)
+                CollectorConfiguration(
+                        routing {
+                            for (route in routingArray) {
+                                val routeObj = route.asJsonObject
+                                defineRoute {
+                                    fromDomain(routeObj.getPrimitiveAsString(DOMAIN_CONFIGURATION_KEY))
+                                    toTopic(routeObj.getPrimitiveAsString(TOPIC_CONFIGURATION_KEY))
+                                    withFixedPartitioning()
+                                }
+                            }
+                        }.build()
+                )
+            } catch (e: NullPointerException) {
+                throw ParsingException("Failed to parse configuration", e)
+            }
+
+    private fun JsonObject.getPrimitiveAsString(memberName: String) = getAsJsonPrimitive(memberName).asString
+
+
+    companion object {
+        private const val ROUTING_CONFIGURATION_KEY = "collector.routing"
+        private const val DOMAIN_CONFIGURATION_KEY = "fromDomain"
+        private const val TOPIC_CONFIGURATION_KEY = "toTopic"
+
+        private const val MAX_RETRIES = 5L
+        private val logger = Logger(ConfigurationProviderImpl::class)
+    }
+}