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/*-
* ============LICENSE_START=======================================================
* PROJECT
* ================================================================================
* Copyright (C) 2017-2018 AT&T 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.dcae.controller;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;
public class FetchDynamicConfig {
private static final Logger log = LoggerFactory.getLogger(FetchDynamicConfig.class);
public static String configFile = "/opt/app/KV-Configuration.json";
static String url;
static String retString;
public FetchDynamicConfig() {
}
public static void main(String[] args) {
Map<String, String> env = System.getenv();
for (Map.Entry<String, String> entry : env.entrySet()) {
log.info("%s=%s%n", entry.getKey(), entry.getValue());
}
if (env.containsKey("CONSUL_HOST") && env.containsKey("CONFIG_BINDING_SERVICE")) {
// && env.containsKey("HOSTNAME")) {
log.info(">>>Dynamic configuration to be fetched from ConfigBindingService");
url = env.get("CONSUL_HOST") + ":8500/v1/catalog/service/" + env.get("CONFIG_BINDING_SERVICE");
retString = executecurl(url);
// consul return as array
JSONTokener temp = new JSONTokener(retString);
JSONObject cbsjobj = (JSONObject) new JSONArray(temp).get(0);
String urlPart1 = null;
if (cbsjobj.has("ServiceAddress") && cbsjobj.has("ServicePort")) {
urlPart1 = cbsjobj.getString("ServiceAddress") + ":" + cbsjobj.getInt("ServicePort");
}
log.info("CONFIG_BINDING_SERVICE DNS RESOLVED:" + urlPart1);
FetchDynamicConfig fc= new FetchDynamicConfig();
if (env.containsKey("HOSTNAME"))
{
url = urlPart1 + "/service_component/" + env.get("HOSTNAME");
retString = executecurl(url);
}
else if (env.containsKey("SERVICE_NAME"))
{
url = urlPart1 + "/service_component/" + env.get("SERVICE_NAME");
retString = executecurl(url);
}
else
{
log.error("Service name environment variable - HOSTNAME/SERVICE_NAME not found within container ");
}
fc.writefile(retString);
} else {
log.info(">>>Static configuration to be used");
}
}
public void writefile (String retString)
{
log.info("URL to fetch configuration:" + url + " Return String:" + retString);
String indentedretstring=(new JSONObject(retString)).toString(4);
try (FileWriter file = new FileWriter(FetchDynamicConfig.configFile)) {
file.write(indentedretstring);
log.info("Successfully Copied JSON Object to file /opt/app/KV-Configuration.json");
} catch (IOException e) {
log.error("Error in writing configuration into file /opt/app/KV-Configuration.json " + retString, e);
e.printStackTrace();
}
}
public static String executecurl(String url) {
String[] command = { "curl", "-v", url };
ProcessBuilder process = new ProcessBuilder(command);
Process p;
String result = null;
try {
p = process.start();
InputStreamReader ipr = new InputStreamReader(p.getInputStream());
BufferedReader reader = new BufferedReader(ipr);
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
result = builder.toString();
log.info(result);
reader.close();
ipr.close();
} catch (IOException e) {
log.error("error", e);
e.printStackTrace();
}
return result;
}
}
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