From 7752c2d818e6d19e4d805c2fd6760b4a13d601bc Mon Sep 17 00:00:00 2001
From: PawelSzalapski <pawel.szalapski@nokia.com>
Date: Thu, 2 Aug 2018 10:31:56 +0200
Subject: Implement second part of dynamic DMaaP config

VESCollector app can now fetch CBS configuration and
rebuilt the part regarding sending events dynamically,
without restarting application.
Application will still be restarted by a .sh script,
if there were changes regarding collector.properties file.
The decision of whether dynamic configuration should be
triggered is now based on existence of env vars
CONSUL_HOST, CONFIG_BINDING_SERVICE, HOSTNAME,
not as previously on CBSPOLLTIME.
Frequency at which the config check should happen is
now exposed via property from collector.properties

Change-Id: I98ff160fa51d08d84a23c716d90ceaacbe17ada6
Signed-off-by: PawelSzalapski <pawel.szalapski@nokia.com>
Issue-ID: DCAEGEN2-519
---
 .../onap/dcae/controller/EnvPropertiesReader.java  | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/main/java/org/onap/dcae/controller/EnvPropertiesReader.java

(limited to 'src/main/java/org/onap/dcae/controller/EnvPropertiesReader.java')

diff --git a/src/main/java/org/onap/dcae/controller/EnvPropertiesReader.java b/src/main/java/org/onap/dcae/controller/EnvPropertiesReader.java
new file mode 100644
index 00000000..23bcbda8
--- /dev/null
+++ b/src/main/java/org/onap/dcae/controller/EnvPropertiesReader.java
@@ -0,0 +1,77 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.ves
+ * ================================================================================
+ * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2018 Nokia. 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.dcae.controller;
+
+import static io.vavr.API.List;
+import static io.vavr.API.Try;
+import static org.onap.dcae.commonFunction.event.publishing.VavrUtils.f;
+
+import io.vavr.collection.Map;
+import io.vavr.control.Option;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class EnvPropertiesReader {
+
+    private final static Logger log = LoggerFactory.getLogger(EnvPropertiesReader.class);
+
+    static Option<EnvProps> readEnvProps(Map<String, String> environmentVariables) {
+        log.info("Loading necessary environment variables for dynamic configuration update");
+        int consulPort = getConsulPort(environmentVariables);
+        Option<String> consulHost = getConsulHost(environmentVariables);
+        Option<String> cbsServiceName = getCBSName(environmentVariables);
+        Option<String> vesCollectorAppName = getAppName(environmentVariables);
+        return Option.sequence(List(consulHost, cbsServiceName, vesCollectorAppName))
+            .map(e -> new EnvProps(e.get(0), consulPort, e.get(1), e.get(2)))
+            .onEmpty(() -> log.warn("Some required environment variables are missing"))
+            .peek(props -> log.info(f("Discovered following environment variables: '%s'", props)));
+    }
+
+    private static Option<String> getAppName(Map<String, String> environmentVariables) {
+        return environmentVariables.get("HOSTNAME")
+            .orElse(environmentVariables.get("SERVICE_NAME"))
+            .onEmpty(() -> log.warn("App service name (as registered in CBS) (env var: 'HOSTNAME' / 'SERVICE_NAME') "
+                + "is missing error environment variables."));
+    }
+
+    private static Option<String> getCBSName(Map<String, String> environmentVariables) {
+        return environmentVariables.get("CONFIG_BINDING_SERVICE")
+            .onEmpty(() -> log.warn("Name of CBS Service (as registered in Consul) (env var: 'CONFIG_BINDING_SERVICE') "
+                + "is missing from environment variables."));
+    }
+
+    private static Integer getConsulPort(Map<String, String> environmentVariables) {
+        return environmentVariables.get("CONSUL_PORT")
+            .flatMap(str -> Try(() -> Integer.valueOf(str))
+                .onFailure(exc -> log.warn("Consul port is not an integer value", exc))
+                .toOption())
+            .onEmpty(() -> log.warn("Consul port (env var: 'CONSUL_PORT') is missing from environment variables. "
+                + "Using default value of 8500"))
+            .getOrElse(8500);
+    }
+
+    private static Option<String> getConsulHost(Map<String, String> environmentVariables) {
+        return environmentVariables.get("CONSUL_HOST")
+            .onEmpty(() -> log.warn("Consul host (env var: 'CONSUL_HOST') (without port) "
+                + "is missing from environment variables."));
+    }
+
+}
-- 
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