Fix consul request timeout issue

Fix timeout issue when using consul blocking query calls
by switching to standard requests peformed in given interval

Closes ONAP-628

Change-Id: Ifaf7ddfa27045015a7a90c178e0d6d38955c0c58
Signed-off-by: Jakub Dudycz <jakub.dudycz@nokia.com>
Issue-ID: DCAEGEN2-601

4 files changed, 53 insertions, 23 deletions

diff --git a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/AdapterFactory.kt b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/AdapterFactory.kt
index 2a8a3960..11a0e9bd 100644
--- a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/AdapterFactory.kt
+++ b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/AdapterFactory.kt
@@ -22,6 +22,7 @@ package org.onap.dcae.collectors.veshv.impl.adapters
 import org.onap.dcae.collectors.veshv.boundary.ConfigurationProvider
 import org.onap.dcae.collectors.veshv.boundary.SinkProvider
 import org.onap.dcae.collectors.veshv.impl.adapters.kafka.KafkaSinkProvider
+import org.onap.dcae.collectors.veshv.model.ConfigurationProviderParams
 import reactor.ipc.netty.http.client.HttpClient
 import java.time.Duration
 
@@ -33,8 +34,13 @@ object AdapterFactory {
     fun kafkaSink(): SinkProvider = KafkaSinkProvider()
     fun loggingSink(): SinkProvider = LoggingSinkProvider()
 
-    fun consulConfigurationProvider(url: String, firstRequestDelay: Duration): ConfigurationProvider =
-            ConsulConfigurationProvider(url, httpAdapter(), firstRequestDelay)
+    fun consulConfigurationProvider(configurationProviderParams: ConfigurationProviderParams): ConfigurationProvider =
+            ConsulConfigurationProvider(
+                    configurationProviderParams.configurationUrl,
+                    httpAdapter(),
+                    configurationProviderParams.firstRequestDelay,
+                    configurationProviderParams.requestInterval
+            )
 
     fun httpAdapter(): HttpAdapter = HttpAdapter(HttpClient.create())
 }
diff --git a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConsulConfigurationProvider.kt b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConsulConfigurationProvider.kt
index 621c63f8..aca0e7e9 100644
--- a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConsulConfigurationProvider.kt
+++ b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConsulConfigurationProvider.kt
@@ -41,10 +41,10 @@ import javax.json.JsonObject
  */
 internal class ConsulConfigurationProvider(private val url: String,
                                            private val http: HttpAdapter,
-                                           private val firstRequestDelay: Duration
+                                           private val firstRequestDelay: Duration,
+                                           private val requestInterval: Duration
 ) : ConfigurationProvider {
 
-    private val lastModifyIndex: AtomicReference<Int> = AtomicReference(0)
     private val lastConfigurationHash: AtomicReference<Int> = AtomicReference(0)
 
     override fun invoke(): Flux<CollectorConfiguration> =
@@ -62,27 +62,22 @@ internal class ConsulConfigurationProvider(private val url: String,
                     }.build())
     ).doOnNext { logger.info("Applied default configuration") }
 
-    private fun createConsulFlux(): Flux<CollectorConfiguration> =
-            http.get(url, mapOf(Pair("index", lastModifyIndex.get())))
-                    .doOnError {
-                        logger.error("Encountered an error " +
-                                "when trying to acquire configuration from consul. Shutting down..")
-                    }
-                    .map(::parseJsonResponse)
-                    .doOnNext(::updateModifyIndex)
-                    .map(::extractEncodedConfiguration)
-                    .flatMap(::filterDifferentValues)
-                    .map(::decodeConfiguration)
-                    .map(::createCollectorConfiguration)
-                    .repeat()
-                    .delaySubscription(firstRequestDelay)
+    private fun createConsulFlux(): Flux<CollectorConfiguration> = Flux
+            .interval(firstRequestDelay, requestInterval)
+            .flatMap { http.get(url) }
+            .doOnError {
+                logger.error("Encountered an error " +
+                        "when trying to acquire configuration from consul. Shutting down..")
+            }
+            .map(::parseJsonResponse)
+            .map(::extractEncodedConfiguration)
+            .flatMap(::filterDifferentValues)
+            .map(::decodeConfiguration)
+            .map(::createCollectorConfiguration)
 
     private fun parseJsonResponse(responseString: String): JsonObject =
             Json.createReader(StringReader(responseString)).readArray().first().asJsonObject()
 
-    private fun updateModifyIndex(response: JsonObject) =
-            lastModifyIndex.set(response.getInt("ModifyIndex"))
-
     private fun extractEncodedConfiguration(response: JsonObject): String =
             response.getString("Value")
 
diff --git a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ConfigurationProviderParams.kt b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ConfigurationProviderParams.kt
new file mode 100644
index 00000000..9de34498
--- /dev/null
+++ b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ConfigurationProviderParams.kt
@@ -0,0 +1,30 @@
+/*
+ * ============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.model
+
+import java.time.Duration
+
+/**
+ * @author Jakub Dudycz <jakub.dudycz@nokia.com>
+ * @since July 2018
+ */
+data class ConfigurationProviderParams(val configurationUrl: String,
+                                       val firstRequestDelay: Duration,
+                                       val requestInterval: Duration)
diff --git a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ServerConfiguration.kt b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ServerConfiguration.kt
index a486996e..93ad719d 100644
--- a/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ServerConfiguration.kt
+++ b/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/model/ServerConfiguration.kt
@@ -28,8 +28,7 @@ import java.time.Duration
  */
 data class ServerConfiguration(
         val port: Int,
-        val configurationUrl: String,
-        val firstRequestDelay: Duration,
+        val configurationProviderParams: ConfigurationProviderParams,
         val securityConfiguration: SecurityConfiguration,
         val idleTimeout: Duration,
         val dummyMode: Boolean = false)