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/*
* ============LICENSE_START=======================================================
* ONAP : DCAE
* ================================================================================
* Copyright 2019 TechMahindra
*=================================================================================
* 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.universalvesadapter.utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
public class FetchDynamicConfig {
private static final Logger debugLogger = LoggerFactory.getLogger("debugLogger");
private static final Logger errorLogger = LoggerFactory.getLogger("errorLogger");
// need to change below path
public static String configFile = "/opt/app/VESAdapter/conf/kv.json";
//public static String configFile = "src\\main\\resources\\kv.json";
private static String url;
public static String retString;
public static String retCBSString;
private static Map<String, String> env;
public FetchDynamicConfig() {
}
public static void cbsCall() {
env = System.getenv();
Boolean areEqual;
// Call consul api and identify the CBS Service address and port
getconsul();
// Construct and invoke CBS API to get application Configuration
getCBS();
// Verify if data has changed
areEqual = verifyConfigChange();
if (!areEqual) {
FetchDynamicConfig fc = new FetchDynamicConfig();
fc.writefile(retCBSString);
} else {
debugLogger.info("New config pull results identical - " + configFile + " NOT refreshed");
}
}
private static void getconsul() {
url = env.get("CONSUL_HOST") + ":8500/v1/catalog/service/" + env.get("CONFIG_BINDING_SERVICE");
// for testing :url="10.12.6.50:8500/v1/catalog/service/config_binding_service";
//http://10.12.6.44:8500/v1/catlog/service/config_binding_service
retString = executecurl(url);
debugLogger.info("CBS details fetched from Consul");
}
public static boolean verifyConfigChange() {
boolean areEqual = false;
// Read current data
try {
File f = new File(configFile);
if (f.exists() && !f.isDirectory()) {
String jsonData = readFile(configFile);
JSONObject jsonObject = new JSONObject(jsonData);
ObjectMapper mapper = new ObjectMapper();
JsonNode tree1 = mapper.readTree(jsonObject.toString());
JsonNode tree2 = mapper.readTree(retCBSString);
areEqual = tree1.equals(tree2);
debugLogger.info("Comparison value:" + areEqual);
} else {
debugLogger.info("First time config file read: " + configFile);
}
} catch (IOException e) {
errorLogger.error("Comparison with new fetched data failed" + e.getMessage());
}
return areEqual;
}
public static void getCBS() {
// 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");
}
debugLogger.info("CONFIG_BINDING_SERVICE DNS RESOLVED:" + urlPart1);
if (env.containsKey("HOSTNAME")) {
url = urlPart1 + "/service_component/" + env.get("HOSTNAME");
retCBSString = executecurl(url);
} else if (env.containsKey("SERVICE_NAME")) {
url = urlPart1 + "/service_component/" + env.get("SERVICE_NAME");
retCBSString = executecurl(url);
} else {
errorLogger.error("Service name environment variable - HOSTNAME/SERVICE_NAME not found within container ");
}
}
public void writefile(String retCBSString) {
debugLogger.info("URL to fetch configuration:" + url);
String indentedretstring = (new JSONObject(retCBSString)).toString(4);
try (FileWriter file = new FileWriter(FetchDynamicConfig.configFile)) {
file.write(indentedretstring);
debugLogger.info("Successfully Copied JSON Object to file " + configFile);
} catch (IOException e) {
errorLogger.error("Error in writing configuration into file " + configFile + retString + e.getMessage());
e.printStackTrace();
}
}
public static String readFile(String filename) {
String result = "";
try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
line = br.readLine();
}
result = sb.toString();
} catch (FileNotFoundException e) {
errorLogger.error("colud not find file :",filename);
} catch (Exception e) {
errorLogger.error("unable to read the file , reason:",e.getCause());
}
return result;
}
private 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();
debugLogger.info(result);
reader.close();
ipr.close();
} catch (IOException e) {
errorLogger.error("error", e);
e.printStackTrace();
}
return result;
}
}
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