source: main/trunk/greenstone3/src/java/org/greenstone/server/Server2.java@ 24455

package org.greenstone.server;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.net.URL;
//import java.net.URLConnection;
import java.util.Properties;
import java.util.ArrayList;

import org.apache.log4j.*;

import org.greenstone.util.PortFinder;
import org.greenstone.util.ScriptReadWrite;
import org.greenstone.util.RunMake;
import org.greenstone.util.RunAnt;

import org.greenstone.server.BaseServer;
import org.greenstone.server.BaseProperty;


public class Server2 extends BaseServer 
{
    private static final int WAITING_TIME = 10; // time to wait and check for whether the server is running
    private static final String URL_PENDING="URL_pending";

    protected String libraryURL;

    private class QuitListener extends Thread 
    {
    int quitPort = -1;
    ServerSocket serverSocket = null;

    public QuitListener(int quitport) throws Exception {
        ///Server2.this.recordSuccess("In QuitListener constructor");
        this.quitPort = quitport;
        serverSocket = new ServerSocket(quitPort);
    }

    public void run() {
        Socket connection = null;

        try {
        // wait for a connection
        connection = serverSocket.accept();
        boolean stop = false;

        // read input
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line = null;
            while((line = reader.readLine()) != null) {
            if(line.equals("QUIT")) {
                stop = true;                
                // Server2.this.recordSuccess("In QuitListener - line is QUIT");
                reader.close();
                reader = null;
                serverSocket.close();
                serverSocket = null;
                break;
            } else if(line.equals("RECONFIGURE")) {
                server_control_.displayMessage(dictionary.get("ServerControl.Configuring"));
                reconfigRequired();
            } else if(line.equals("RESTART")) {

                // If the GSI is set to NOT autoenter/autostart the server, then write url=URL_PENDING out to the file.
                // When the user finally presses the Enter Library button and so has started up the server, the correct
                // url will be written out to the configfile.
                if(config_properties.getProperty(BaseServer.Property.AUTOSTART, "").equals("0")) {
                if(config_properties.getProperty("url") == null) {
                    config_properties.setProperty("url", URL_PENDING);
                    ScriptReadWrite scriptReadWrite = new ScriptReadWrite();
                    ArrayList fileLines = scriptReadWrite.readInFile(BaseServer.config_properties_file);
                    scriptReadWrite.replaceOrAddLine(fileLines, "url", URL_PENDING, true);
                    scriptReadWrite.writeOutFile(config_properties_file, fileLines);
                }
                }

                autoStart();
            }
            }
        } catch(Exception e) {
            Server2.this.recordError("Exception in QuitListener thread.");
        } finally {
            if(stop) {
            Server2.this.stop();
            System.exit(0);
            }
        }
        } catch(IOException ioe) {
        Server2.this.recordError("Server2.QuitListener: Unable to make the connection with the client socket." + ioe);
        }
    }
    }


    public Server2(String gsdl2_home, String lang, String configfile, int quitPort)
    {
    super(gsdl2_home, lang, configfile, "etc"+File.separator+"logs-gsi");   
                   // configfile can be either glisite.cfg or llssite.cfg

    Property = new Server2Property();
    
    String frame_title = dictionary.get("ServerControl.Frame_Title");
    server_control_ = new Server2Control(this,frame_title);

    /* Make command targets for managing Web server */
    START_CMD     = "web-start";
    RESTART_CMD   = "web-restart";
    CONFIGURE_CMD = "configure-web \"" + configfile + "\"";
    STOP_CMD      = "web-stop";

    // now we can monitor for the quit command if applicable
    if(quitPort != -1) { 
        // First check if given port is within the range of allowed ports
        if(PortFinder.isAssignablePortNumber(quitPort)) {
        try {
            new QuitListener(quitPort).start();
        } catch(Exception e) {
            Server2.this.recordError("Exception constructing the QuitListener thread.");
        }
        }
        else {
        recordError("QuitPort provided is not within acceptable range: ("
                + PortFinder.PORTS_RESERVED + " - " + PortFinder.MAX_PORT + "]" );
        quitPort = -1;
        }
    }
    
    // For some machines, localhost is not sufficient, 
    // need hostname defined as well (e.g. Ubuntu 10.10)
    InetAddress inetAddress = null;
    try {
        inetAddress = InetAddress.getLocalHost();
        String hosts = inetAddress.getHostName();
        ScriptReadWrite scriptReadWrite = new ScriptReadWrite();
        ArrayList fileLines = scriptReadWrite.readInFile(BaseServer.config_properties_file);
        scriptReadWrite.replaceOrAddLine(fileLines, "hosts", hosts, true);
        scriptReadWrite.writeOutFile(config_properties_file, fileLines);
    } catch(UnknownHostException e) {
        // Unable to get hostname, need to try for the default localhost without it
    }       

    // If the GSI is set to NOT autoenter/autostart the server, then write url=URL_PENDING out to the file.
    // When the user finally presses the Enter Library button and so has started up the server, the correct
    // url will be written out to the configfile.
    if(config_properties.getProperty(BaseServer.Property.AUTOSTART, "").equals("0")) {//if(configfile.endsWith("llssite.cfg")) {
        if(config_properties.getProperty("url") == null) {
        config_properties.setProperty("url", URL_PENDING);
        ScriptReadWrite scriptReadWrite = new ScriptReadWrite();
        ArrayList fileLines = scriptReadWrite.readInFile(BaseServer.config_properties_file);
        scriptReadWrite.replaceOrAddLine(fileLines, "url", URL_PENDING, true);
        scriptReadWrite.writeOutFile(config_properties_file, fileLines);
        }
    }
    
    autoStart();
    }

    // Prepare the log4j.properties for GS2
    protected void initLogger() {

    String libjavaFolder = gsdl_home+File.separator+"lib"+File.separator+"java"+File.separator;
    File propsFile = new File(libjavaFolder+"log4j.properties");

    // create it from the template file log4j.properties.in
    if(!propsFile.exists()) {
        try {
        // need to set gsdl2.home property's value to be gsdl_home,
        // so that the location  of the log files gets resolved correctly
        
        // load the template log4j.properties.in file into logProps
        FileInputStream infile = new FileInputStream(new File(libjavaFolder+"log4j.properties.in"));
        if(infile != null) {
            Properties logProps = new Properties();
            logProps.load(infile);
            infile.close();

            // set gsdl3.home to gsdl_home
            logProps.setProperty("gsdl2.home", gsdl_home);
            
            // write the customised properties out to a custom log4j.properties file
            FileOutputStream outfile = new FileOutputStream(propsFile);
            if(outfile != null) {
            logProps.store(outfile, "Customised log4j.properties file");
            outfile.close();
            } else {
            System.err.println("Could not store properties file " + propsFile + " for Server2.");
            }
        }
        } catch(Exception e) {
        System.err.println("Exception occurred when custom-configuring the logger for Server2.\n" + e);
        }
    }

    // now configure the logger with the custom log4j.properties file
    if(propsFile.exists()) {
        PropertyConfigurator.configure(propsFile.getAbsolutePath());
    } else {
        System.err.println("Could not create properties file " + propsFile + " for Server2.");
    }
    }
    

    protected int runTarget(String cmd)
    {
    RunMake runMake = new RunMake();
    runMake.setTargetCmd(cmd);
    runMake.run();
    return runMake.getTargetState();
    }

    public String getBrowserURL() {
    return libraryURL;
    }

    // works out the library URL again
    public void reload() {
    // default values, to be replaced with what's in gsdlsite.cfg
    String host = "localhost";
    String port = "80";
    String gwcgi;
    String httpprefix = "/greenstone";
    String suffix = "/cgi-bin/library.cgi";

    // get the prefix from the gsdlsite.cfg and build.properties files (port number and servername)
    try{
        File gsdlsite_cfg = new File(gsdl_home + File.separator + "cgi-bin" + File.separator + "gsdlsite.cfg");
        FileInputStream fin = new FileInputStream(gsdlsite_cfg); 
        Properties gsdlProperties = new Properties();
        if(fin != null) {
        gsdlProperties.load(fin);
        
        gwcgi = gsdlProperties.getProperty("gwcgi");
        if(gwcgi != null) {
            suffix = gwcgi;
        } else {
            httpprefix = gsdlProperties.getProperty("httpprefix", httpprefix);
            suffix = httpprefix + suffix;
        }
        fin.close();
        } else {
        recordError("Could not open gsdlsite_cfg for reading, using default library prefix.");
        }
        //reloadConfigProperties();
        port = config_properties.getProperty("portnumber", port);
        
        // The "hosts" property in the config file contains more than one allowed host
        // Need to work out the particular host chosen from the address_resolution_method
        // Default is address_resolution_method 2: localhost
        String addressResolutionMethod = config_properties.getProperty("address_resolution_method");
        int address_resolution_method = (addressResolutionMethod == null) ? 2 : Integer.parseInt(addressResolutionMethod);
        InetAddress inetAddress = null;
        try {
        inetAddress = InetAddress.getLocalHost();
        } catch(UnknownHostException e) {
        logger_.error(e);
        logger_.info("Defaulting host IP to "+ host); // use the default        
        address_resolution_method = 2;
        inetAddress = null;
        }
        switch(address_resolution_method) {
        case 0:
        host = inetAddress.getHostName();
        break;
        case 1:
        host = inetAddress.getHostAddress();
        break;
        case 2:
        host = "localhost";
        break;
        case 3:
        host = "127.0.0.1";
        break;
        default:
        host = "localhost";         
        }
    } catch(Exception e) {
        recordError("Exception trying to load properties from gsdlsite_cfg. Using default library prefix.", e);
        suffix = httpprefix + suffix;
    }

    libraryURL = "http://" + host + ":" + port + suffix;
    }

    public void reloadConfigProperties(boolean port_has_changed) {
    super.reloadConfigProperties(port_has_changed);

    // make sure the port is okay, otherwise find another port
    // first choice is port 80, second choice starts at 8282
    String port = config_properties.getProperty("portnumber", "80");
    String keepport = config_properties.getProperty("keepport", "0"); // default is to not try to force the same port if in use by other servers

    int portDefault = 8282;
    try {
      int portNum = Integer.parseInt(port);
      boolean verbose = true;
      if(port_has_changed) { // this is the test that prevents the server from arbitrarily shifting the port. 
                            // only check at configured port if it's not the current port (the port we
                            // are still running on), because that will always be in use and unavailable.
        if(!PortFinder.isPortAvailable(portNum, verbose)) { // first time, print any Port Unavailable messages
        if(keepport.equals("1")) {
            String errorMsg = "Unable to run the Greenstone server on port " + port + ". It may already be in use.";
            System.err.println("\n******************");
            logger_.error(errorMsg);
            System.err.println("If you wish to try another port, go to File > Settings of the Greenstone Server interface and either change the port number or untick the \"Do Not Modify Port\" option there. Then press the \"Enter Library\" button.");
            System.err.println("******************\n");
        } else { // can modify port, try to find a new port
        
            PortFinder portFinder = new PortFinder(portDefault, 101);
            // Search for a free port silently from now on--don't want more
            // messages saying that a port could not be found...
            portNum = portFinder.findPortInRange(!verbose);
            
            if (portNum == -1) {
            // If we've still not found a free port, do we try the default port again?
            System.err.println("No free port found. Going to try on " + portDefault + " anyway.");
            port = Integer.toString(portDefault);
            } else {
            port = Integer.toString(portNum);
            }
            config_properties.setProperty("portnumber", port); // store the correct port
            
            // write this updated port to the config file, since the configure target uses the file to run
            ScriptReadWrite scriptReadWrite = new ScriptReadWrite();
            ArrayList fileLines = scriptReadWrite.readInFile(BaseServer.config_properties_file);
            scriptReadWrite.replaceOrAddLine(fileLines, "portnumber", port, false); // write the correct port
            scriptReadWrite.writeOutFile(config_properties_file, fileLines);
            
            configure_required_ = true;
            System.err.println("Running server on port " + port + ".");
        }
        }
      } 
    } catch (Exception e) {
        recordError("Exception in Server2.reload(): " + e.getMessage());
        port = Integer.toString(portDefault);
    }
    
    }

    
    // About to stop the webserver
    // Custom GS2 action: remove the url property from the config file
    protected void preStop() {
    ScriptReadWrite scriptReadWrite = new ScriptReadWrite();
    ArrayList fileLines = scriptReadWrite.readInFile(BaseServer.config_properties_file);

    // Remove the url=... line, start searching from the end
    boolean done = false;
    for (int i = fileLines.size()-1; i >= 0 && !done; i--) {
        String line = ((String) fileLines.get(i)).trim();
        if(line.startsWith("url=")) {
        fileLines.remove(i);
        done = true;
        }
    }
    scriptReadWrite.writeOutFile(config_properties_file, fileLines);
    }

    // Called when the URL has been changed (called after a reload() and starting the server).
    // By the time we get here, reload() would already have been called and have set
    // both the port and worked out libraryURL
    // This method needs to write the URL to the configfile since things should work
    // like GS2's Local Lib Server for Windows
    protected void postStart() {

    URL libURL = null;
    try {
        libURL = new URL(libraryURL);
    } catch (Exception e) {
        recordError("Unable to convert library URL string into a valid URL, Server2.java." + e);
    }
    
    // 1. Test that the server is running at the libraryURL before writing it out to glisite.cfg/configfile 
    // A quick test involves opening a connection to get the home page for this collection
    if(libURL != null && !libraryURL.equals(URL_PENDING)) {

        boolean ready = false; 
        for(int i = 0; i < WAITING_TIME && !ready; i++) {
        try {
            libURL.openConnection();
            //URLConnection connection = new URL(libraryURL).openConnection();
            //connection.getContent();
            ready = true;
            recordSuccess("Try connecting to server on url: '" + libraryURL + "'");
        } catch (IOException bad_url_connection) {
            // keep looping
            recordSuccess("NOT YET CONNECTED. Waiting to try again...");
            try {
            Thread.sleep(1000);
            } catch (InterruptedException ie) {
            ready = true;
            recordError("Unexpected: got an InterruptedException in sleeping thread, Server2.java." + ie);
            }
        } catch (Exception e) {
            ready = true;
            recordError("Got an Exception while waiting for the connection to become live, Server2.java." + e);
        }
        }
    }

    // 2. Now write the URL to the config file
    String port = config_properties.getProperty("portnumber");

    ScriptReadWrite scriptReadWrite = new ScriptReadWrite();
    ArrayList fileLines = scriptReadWrite.readInFile(BaseServer.config_properties_file);
    scriptReadWrite.replaceOrAddLine(fileLines, "url", libraryURL, true);
    scriptReadWrite.replaceOrAddLine(fileLines, "portnumber", port, false); // write the correct port
    scriptReadWrite.writeOutFile(config_properties_file, fileLines);
    }


    public static void main (String[] args)
    {
        if ((args.length < 1) || (args.length > 4)) {
        System.err.println(
           "Usage: java org.greenstone.server.Server2 <gsdl2-home-dir> [lang] [--config=configfile] [--quitport=portNum]");
        System.exit(1);
    }
    
    String gsdl2_home = args[0];
    File gsdl2_dir = new File(gsdl2_home);
    if (!gsdl2_dir.isDirectory()) {
        System.err.println("gsdl-home-dir directory does not exist!");
        System.exit(1);
    }
    
    String lang = (args.length>=2) ? args[1] : "en";
    
    // if no config file is given, then it defaults to llssite.cfg (embedded in quotes to preserve spaces in the filepath)
    File defaultConfigFile = new File(gsdl2_dir, "llssite.cfg");
    String configfile = (args.length>=3 && args[2].startsWith("--config=")) ? args[2] : defaultConfigFile.getAbsolutePath();
    gsdl2_dir = null;
    defaultConfigFile = null;

    int equalSign = configfile.indexOf('=');
    if(equalSign != -1) {
        configfile = configfile.substring(equalSign+1);
    }

    String quitport = (args.length == 4 && args[3].startsWith("--quitport=")) ? args[3] : "";
    equalSign = quitport.indexOf('=');
    int port = -1;
    if(equalSign != -1) {
        try {
        quitport = quitport.substring(equalSign+1);
        port = Integer.parseInt(quitport);
        } catch(Exception e) { // parse fails
        System.err.println("Port must be numeric. Continuing without it.");
        }
    }

    //System.err.println("Running server with config file: " + configfile);
    
    new Server2(gsdl2_home, lang, configfile, port);
    }
}