server/filtermanager/HostInit.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.filtermanager;

//---IMPORTS---
import uk.org.iscream.cms.server.core.*;
import uk.org.iscream.cms.server.filter.*;
import uk.org.iscream.cms.util.*;
import uk.org.iscream.cms.server.componentmanager.*;
import java.net.*;
import java.io.*;
import java.util.*;

/**
 * Handles setting up a host.
 * This class provides a host with appropriate configuration
 * and a reference to a Filter to which it should pass data.
 *
 * @author  $Author: tdb $
 * @version $Id: HostInit.java,v 1.33 2002/09/06 15:10:48 tdb Exp $
 */
class HostInit extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.33 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Construct a new HostInit.
     *
     * @param socket The socket to which the host is connected
     */
    public HostInit(Socket socket) throws IOException {
        // set the Thread name
        setName("filtermanager.HostInit");
        
        _socket = socket;
        // setup reader & writer
        _socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
        _socketOut = new PrintWriter(_socket.getOutputStream(), true);
        _logger.write(toString(), Logger.SYSINIT, "created");
    }
    
//---PUBLIC METHODS---

    /**
     * Main method in this class, which handles communicating with
     * the host to determine it's setup.
     */
    public void run() {
        // get a hook on the config proxy
        ConfigurationProxy cp = ConfigurationProxy.getInstance();
        // this is our config name
        String configName = "Host." + _socket.getInetAddress().getHostName().toLowerCase();
        try {
            // try for STARTCONFIG
            getInBound("STARTCONFIG");
            _socketOut.println("OK");
            
            // try for LASTMODIFIED
            getInBound("LASTMODIFIED");
            _socketOut.println(cp.getLastModified(configName));
            
            // try for FILELIST
            getInBound("FILELIST");
            _socketOut.println(cp.getFileList(configName));
            
            // try for FQDN
            getInBound("FQDN");
            _socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
            
            // get properties
            String reqProperty = getInBound();
            while(!reqProperty.equals("ENDCONFIG")) {
                // get the property
                try {
                    String returnedProperty = cp.getProperty(configName, "Host."+reqProperty);
                    _socketOut.println(returnedProperty);
                } catch (PropertyNotFoundException e) {
                    _socketOut.println("ERROR");
                }
                // get the next request
                reqProperty = _socketIn.readLine();
            }
            _logger.write(toString(), Logger.SYSMSG, "configured host");
            _socketOut.println("OK");
            
            // get filter reference
            getInBound("FILTER");
                // send info
                String filterList = cp.getProperty(configName, "Host.filter");
                FilterInfo filterInfoRef = null;
                String filter = null;
                StringTokenizer st = new StringTokenizer(filterList, ";");
            while (filterInfoRef==null && st.hasMoreTokens()) {
                filter = st.nextToken();
                _logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
                try {
                    filterInfoRef = FilterInfoHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.FilterInfo\\." + filter));
                } catch (ComponentCORBAException e) {
                    _logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
                }
            }
                
            // hopefully we found a filter
            if(filterInfoRef != null) {
                _logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
                try {
                    // tell the host about it...
                        _socketOut.println(filterInfoRef.getHostName() + ";"
                                         + filterInfoRef.getUDPPort() + ";"
                                         + filterInfoRef.getTCPPort());
                    }
                    catch(org.omg.CORBA.COMM_FAILURE e) {
                        // failed to talk to filter, lets signal an error
                        _socketOut.println("ERROR");
                        throw new IOException("error communicating with filter - " + e);
                    }
                }
                else {
                    // ...or throw a wobbly (and tell the host!)
                    _socketOut.println("ERROR");
                    throw new IOException("unable to find filter for host");
                }
            
            // confirm ok with END
            getInBound("END");
            _socketOut.println("OK");
            
        } catch (Exception e) {
            _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
        }
        
        // Disconnect streams & socket
        try {
            _socketIn.close();
            _socketOut.close();
            _socket.close();
        } catch (IOException e) {
            _logger.write(toString(), Logger.ERROR, "exception on socket close");
        }
        _logger.write(toString(), Logger.SYSMSG, "finished");
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

    private String getInBound(String expected) throws IOException {
        // grab the input
        String inBound = getInBound();
        // check if it's what we're expecting
        if(!inBound.equals(expected)) {
            throw new IOException("protocol error - expected:"+expected+" got:" + inBound);
        }
        // it should be ok then
        return inBound;
    }
    
    private String getInBound() throws IOException {
        // grab the input
        String inBound = _socketIn.readLine();
        // check for null's, likely disconnection
        if(inBound == null) {
            throw new IOException("got null from host, maybe it died");
        }
        // it's a valid message it seems
        return inBound;
    }

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();
    
    /**
     * A reference to the Configuration Manager the system is using
     */
    private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
    
    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = FilterManager.NAME;
    
    /** 
     * The socket this class uses
     */
    private Socket _socket;

    /**
     * Used for the input stream of this socket
     */
    private BufferedReader _socketIn;
    
    /**
     * Used for the output stream of this socket
     */
    private PrintWriter _socketOut;

//---STATIC ATTRIBUTES---

}
Revision:	1.34
Committed:	Wed Feb 5 16:43:47 2003 UTC (21 years, 3 months ago) by tdb
Branch:	MAIN
Changes since 1.33:	+4 -4 lines
Log Message:	Changed the server to use the external util package. Quite a minor change, but does affect a lot of files.
#	User	Rev	Content
1	tdb	1.30	/*
2			* i-scream central monitoring system
3	tdb	1.32	* http://www.i-scream.org.uk
4	tdb	1.30	* Copyright (C) 2000-2002 i-scream
5			*
6			* This program is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19			*/
20
21	tdb	1.1	//---PACKAGE DECLARATION---
22	tdb	1.28	package uk.org.iscream.cms.server.filtermanager;
23	tdb	1.1
24			//---IMPORTS---
25	tdb	1.28	import uk.org.iscream.cms.server.core.*;
26			import uk.org.iscream.cms.server.filter.*;
27	tdb	1.34	import uk.org.iscream.cms.util.*;
28	tdb	1.28	import uk.org.iscream.cms.server.componentmanager.*;
29	tdb	1.18	import java.net.*;
30	tdb	1.1	import java.io.*;
31	tdb	1.22	import java.util.*;
32	tdb	1.1
33			/**
34	tdb	1.11	* Handles setting up a host.
35	ajm	1.12	* This class provides a host with appropriate configuration
36			* and a reference to a Filter to which it should pass data.
37	tdb	1.1	*
38	tdb	1.29	* @author $Author: tdb $
39	tdb	1.34	* @version $Id: HostInit.java,v 1.33 2002/09/06 15:10:48 tdb Exp $
40	tdb	1.1	*/
41			class HostInit extends Thread {
42
43			//---FINAL ATTRIBUTES---
44
45			/**
46			* The current CVS revision of this class
47			*/
48	tdb	1.34	public final String REVISION = "$Revision: 1.33 $";
49	tdb	1.1
50			//---STATIC METHODS---
51
52			//---CONSTRUCTORS---
53
54	tdb	1.15	/**
55			* Construct a new HostInit.
56			*
57			* @param socket The socket to which the host is connected
58			*/
59	tdb	1.11	public HostInit(Socket socket) throws IOException {
60	tdb	1.25	// set the Thread name
61			setName("filtermanager.HostInit");
62
63	tdb	1.1	_socket = socket;
64	tdb	1.15	// setup reader & writer
65	tdb	1.1	_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
66	tdb	1.16	_socketOut = new PrintWriter(_socket.getOutputStream(), true);
67	tdb	1.11	_logger.write(toString(), Logger.SYSINIT, "created");
68	tdb	1.1	}
69
70			//---PUBLIC METHODS---
71
72	tdb	1.15	/**
73			* Main method in this class, which handles communicating with
74			* the host to determine it's setup.
75			*/
76	tdb	1.1	public void run() {
77	tdb	1.26	// get a hook on the config proxy
78			ConfigurationProxy cp = ConfigurationProxy.getInstance();
79			// this is our config name
80			String configName = "Host." + _socket.getInetAddress().getHostName().toLowerCase();
81	tdb	1.1	try {
82	tdb	1.26	// try for STARTCONFIG
83			getInBound("STARTCONFIG");
84			_socketOut.println("OK");
85
86			// try for LASTMODIFIED
87			getInBound("LASTMODIFIED");
88			_socketOut.println(cp.getLastModified(configName));
89
90			// try for FILELIST
91			getInBound("FILELIST");
92			_socketOut.println(cp.getFileList(configName));
93
94			// try for FQDN
95			getInBound("FQDN");
96			_socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
97
98			// get properties
99			String reqProperty = getInBound();
100			while(!reqProperty.equals("ENDCONFIG")) {
101			// get the property
102			try {
103			String returnedProperty = cp.getProperty(configName, "Host."+reqProperty);
104			_socketOut.println(returnedProperty);
105			} catch (PropertyNotFoundException e) {
106	tdb	1.2	_socketOut.println("ERROR");
107	tdb	1.4	}
108	tdb	1.26	// get the next request
109			reqProperty = _socketIn.readLine();
110			}
111			_logger.write(toString(), Logger.SYSMSG, "configured host");
112			_socketOut.println("OK");
113
114			// get filter reference
115			getInBound("FILTER");
116			// send info
117			String filterList = cp.getProperty(configName, "Host.filter");
118	tdb	1.29	FilterInfo filterInfoRef = null;
119	tdb	1.26	String filter = null;
120			StringTokenizer st = new StringTokenizer(filterList, ";");
121	tdb	1.29	while (filterInfoRef==null && st.hasMoreTokens()) {
122	tdb	1.26	filter = st.nextToken();
123			_logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
124			try {
125	tdb	1.33	filterInfoRef = FilterInfoHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.FilterInfo\\." + filter));
126	tdb	1.26	} catch (ComponentCORBAException e) {
127			_logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
128	tdb	1.7	}
129	tdb	1.1	}
130	tdb	1.26
131	tdb	1.31	// hopefully we found a filter
132	tdb	1.29	if(filterInfoRef != null) {
133	tdb	1.26	_logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
134	tdb	1.31	try {
135			// tell the host about it...
136			_socketOut.println(filterInfoRef.getHostName() + ";"
137			+ filterInfoRef.getUDPPort() + ";"
138			+ filterInfoRef.getTCPPort());
139			}
140			catch(org.omg.CORBA.COMM_FAILURE e) {
141			// failed to talk to filter, lets signal an error
142			_socketOut.println("ERROR");
143			throw new IOException("error communicating with filter - " + e);
144			}
145	tdb	1.26	}
146			else {
147			// ...or throw a wobbly (and tell the host!)
148			_socketOut.println("ERROR");
149			throw new IOException("unable to find filter for host");
150			}
151
152			// confirm ok with END
153			getInBound("END");
154			_socketOut.println("OK");
155	tdb	1.1
156			} catch (Exception e) {
157	tdb	1.17	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
158	tdb	1.1	}
159
160			// Disconnect streams & socket
161			try {
162			_socketIn.close();
163			_socketOut.close();
164			_socket.close();
165			} catch (IOException e) {
166	tdb	1.11	_logger.write(toString(), Logger.ERROR, "exception on socket close");
167	tdb	1.1	}
168	tdb	1.11	_logger.write(toString(), Logger.SYSMSG, "finished");
169	tdb	1.1	}
170
171			/**
172			* Overrides the {@link java.lang.Object#toString() Object.toString()}
173			* method to provide clean logging (every class should have this).
174			*
175	tdb	1.34	* This uses the uk.org.iscream.cms.util.NameFormat class
176	ajm	1.12	* to format the toString()
177			*
178	tdb	1.1	* @return the name of this class and its CVS revision
179			*/
180			public String toString() {
181	ajm	1.12	return FormatName.getName(
182			_name,
183	ajm	1.13	getClass().getName(),
184	ajm	1.12	REVISION);
185	tdb	1.1	}
186
187			//---PRIVATE METHODS---
188	tdb	1.26
189			private String getInBound(String expected) throws IOException {
190			// grab the input
191			String inBound = getInBound();
192			// check if it's what we're expecting
193			if(!inBound.equals(expected)) {
194			throw new IOException("protocol error - expected:"+expected+" got:" + inBound);
195			}
196			// it should be ok then
197			return inBound;
198			}
199
200			private String getInBound() throws IOException {
201			// grab the input
202			String inBound = _socketIn.readLine();
203			// check for null's, likely disconnection
204			if(inBound == null) {
205			throw new IOException("got null from host, maybe it died");
206			}
207			// it's a valid message it seems
208			return inBound;
209			}
210	tdb	1.1
211			//---ACCESSOR/MUTATOR METHODS---
212
213			//---ATTRIBUTES---
214
215	tdb	1.11	/**
216	ajm	1.12	* This holds a reference to the
217			* system logger that is being used.
218	tdb	1.11	*/
219	ajm	1.12	private Logger _logger = ReferenceManager.getInstance().getLogger();
220	tdb	1.11
221			/**
222			* A reference to the Configuration Manager the system is using
223			*/
224	ajm	1.12	private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
225
226			/**
227			* This is the friendly identifier of the
228			* component this class is running in.
229			* eg, a Filter may be called "filter1",
230			* If this class does not have an owning
231			* component, a name from the configuration
232			* can be placed here. This name could also
233			* be changed to null for utility classes.
234			*/
235			private String _name = FilterManager.NAME;
236
237			/**
238			* The socket this class uses
239			*/
240			private Socket _socket;
241
242			/**
243			* Used for the input stream of this socket
244			*/
245			private BufferedReader _socketIn;
246	tdb	1.11
247	ajm	1.12	/**
248			* Used for the output stream of this socket
249			*/
250			private PrintWriter _socketOut;
251	tdb	1.11
252	tdb	1.1	//---STATIC ATTRIBUTES---
253
254			}