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package pl.edu.mimuw.cloudatlas.fetcher;
import pl.edu.mimuw.cloudatlas.api.Api;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import com.google.gson.Gson;
import pl.edu.mimuw.cloudatlas.model.*;
public class Fetcher {
private static String host;
private static int port;
private static final List<String> fetcherAttributeNames = Arrays.asList(
"avg_load",
"free_disk",
"total_disk",
"free_ram",
"total_ram",
"free_swap",
"total_swap",
"num_processes",
"num_cores",
"kernel_ver",
"logged_users",
"dns_names"
);
private static final List<Type.PrimaryType> fetcherAttributeTypes = Arrays.asList(
Type.PrimaryType.DOUBLE,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.INT,
Type.PrimaryType.STRING,
Type.PrimaryType.INT,
Type.PrimaryType.LIST
);
private static Api api;
private static Process pythonProcess;
private static Value packAttributeValue(Object rawValue, Type.PrimaryType valueType) {
Value val = null;
ArrayList<Value> contacts = new ArrayList<Value>();
if (valueType.equals(Type.PrimaryType.STRING)) {
val = new ValueString((String) rawValue);
} else if (valueType.equals(Type.PrimaryType.INT)) {
val = new ValueInt(((Double) rawValue).longValue());
} else if (valueType.equals(Type.PrimaryType.DOUBLE)) {
val = new ValueDouble((Double) rawValue);
} else if (valueType.equals(Type.PrimaryType.LIST)) {
for (Object c : (ArrayList) rawValue) {
contacts.add(new ValueString((String) c));
}
val = new ValueList(contacts, TypePrimitive.STRING);
} else {
throw new UnsupportedOperationException();
}
return val;
}
private static void initializeApiStub() throws RemoteException, NotBoundException {
Registry registry = LocateRegistry.getRegistry(host, port);
api = (Api) registry.lookup("Api");
System.out.println("Fetcher runs with registry");
}
private static void initializePythonProcess() throws IOException {
String pythonScript = Fetcher.class.getResource("data_fetcher.py").getFile();
String pythonCmd = "/usr/bin/python3 " + pythonScript;
System.out.println("Run cmd: " + pythonCmd);
pythonProcess = Runtime.getRuntime().exec(pythonCmd);
}
private static ArrayList deserializeAttribs(String serializedAttribs) {
Gson g = new Gson();
return g.fromJson(serializedAttribs, ArrayList.class);
}
// https://jj09.net/interprocess-communication-python-java/
private static void fetchData(String zonePath) {
BufferedReader bufferRead;
ArrayList deserializedAttribs;
String jsonAttribs;
System.out.println(System.getProperty("user.dir"));
try {
initializeApiStub();
initializePythonProcess();
bufferRead = new BufferedReader( new InputStreamReader(pythonProcess.getInputStream()));
while((jsonAttribs = bufferRead.readLine()) != null) {
System.out.println(jsonAttribs);
System.out.flush();
deserializedAttribs = deserializeAttribs(jsonAttribs);
for (int i = 0; i < fetcherAttributeNames.size(); i++) {
api.setAttributeValue(
zonePath,
fetcherAttributeNames.get(i),
packAttributeValue(
deserializedAttribs.get(i),
fetcherAttributeTypes.get(i)));
}
}
bufferRead.close();
} catch (Exception e) {
System.err.println("Fetcher exception:");
e.printStackTrace();
}
}
private static void parseArgs(String[] args) {
System.out.println("args length: " + args.length);
if (args.length < 2) {
port = 1099;
} else {
port = Integer.parseInt(args[1]);
}
if (args.length < 1) {
host = "localhost";
} else {
host = args[0];
}
}
public static void main(String[] args) {
String zonePath = System.getProperty("zone_path");
parseArgs(args);
fetchData(zonePath);
}
}
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