1 files changed, 85 insertions, 0 deletions
diff --git a/prh-app-server/src/main/java/org/onap/dcaegen2/services/prh/configuration/EnvironmentProcessor.java b/prh-app-server/src/main/java/org/onap/dcaegen2/services/prh/configuration/EnvironmentProcessor.java
new file mode 100644
index 00000000..d1905108
--- /dev/null
+++ b/prh-app-server/src/main/java/org/onap/dcaegen2/services/prh/configuration/EnvironmentProcessor.java
@@ -0,0 +1,85 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PNF-REGISTRATION-HANDLER
+ * ================================================================================
+ * Copyright (C) 2018 NOKIA Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.dcaegen2.services.prh.configuration;
+
+import java.util.Optional;
+import java.util.Properties;
+import org.onap.dcaegen2.services.prh.exceptions.EnvironmentLoaderException;
+import org.onap.dcaegen2.services.prh.model.EnvProperties;
+import org.onap.dcaegen2.services.prh.model.ImmutableEnvProperties;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Flux;
+
+/**
+ * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 8/10/18
+ */
+class EnvironmentProcessor {
+
+    private static Logger logger = LoggerFactory.getLogger(EnvironmentProcessor.class);
+
+    private EnvironmentProcessor() {
+    }
+
+    static Flux<EnvProperties> evaluate(Properties systemEnvironment) {
+        logger.info("Loading configuration from system environment variables");
+        EnvProperties envProperties;
+        try {
+            envProperties = ImmutableEnvProperties.builder().consulHost(getConsulHost(systemEnvironment))
+                .consulPort(getConsultPort(systemEnvironment)).cbsName(getConfigBindingService(systemEnvironment))
+                .appName(getService(systemEnvironment)).build();
+        } catch (EnvironmentLoaderException e) {
+            return Flux.error(e);
+        }
+        logger.info("Evaluated environment system variables {}", envProperties);
+        return Flux.just(envProperties);
+    }
+
+    private static String getConsulHost(Properties systemEnvironments) throws EnvironmentLoaderException {
+        return Optional.ofNullable(systemEnvironments.getProperty("CONSUL_HOST"))
+            .orElseThrow(() -> new EnvironmentLoaderException("$CONSUL_HOST environment has not been defined"));
+    }
+
+    private static Integer getConsultPort(Properties systemEnvironments) {
+        return Optional.ofNullable(systemEnvironments.getProperty("CONSUL_PORT")).map(Integer::valueOf)
+            .orElseGet(EnvironmentProcessor::getDefaultPortOfConsul);
+    }
+
+    private static String getConfigBindingService(Properties systemEnvironments) throws EnvironmentLoaderException {
+        return Optional.ofNullable(systemEnvironments.getProperty("CONFIG_BINDING_SERVICE"))
+            .orElseThrow(
+                () -> new EnvironmentLoaderException("$CONFIG_BINDING_SERVICE environment has not been defined"));
+    }
+
+    private static String getService(Properties systemEnvironments) throws EnvironmentLoaderException {
+        return Optional.ofNullable(Optional.ofNullable(systemEnvironments.getProperty("HOSTNAME"))
+            .orElse(systemEnvironments.getProperty("SERVICE_NAME")))
+            .orElseThrow(() -> new EnvironmentLoaderException(
+                "Neither $HOSTNAME/$SERVICE_NAME have not been defined as system environment"));
+    }
+
+    private static Integer getDefaultPortOfConsul() {
+        logger.warn("$CONSUL_PORT environment has not been defined");
+        logger.warn("$CONSUL_PORT variable will be set to default port {}", 8500);
+        return 8500;
+    }
+}
+