/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software
* License version 1.1, a copy of which has been included with this
* distribution in the LICENSE.txt file. */
package org.apache.log4j.net;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Level;
import org.apache.log4j.helpers.CyclicBuffer;
import org.apache.log4j.helpers.OptionConverter;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.ErrorCode;
import org.apache.log4j.spi.TriggeringEventEvaluator;
import java.util.Properties;
import java.util.Date;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import javax.mail.Multipart;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.AddressException;
/**
Send an e-mail when a specific logging event occurs, typically on
errors or fatal errors.
<p>The number of logging events delivered in this e-mail depend on
the value of <b>BufferSize</b> option. The
<code>SMTPAppender</code> keeps only the last
<code>BufferSize</code> logging events in its cyclic buffer. This
keeps memory requirements at a reasonable level while still
delivering useful application context.
@author Ceki Gülcü
@since 1.0 */
public class SMTPAppender extends AppenderSkeleton {
private String to;
private String from;
private String subject;
private String smtpHost;
private int bufferSize = 512;
private boolean locationInfo = false;
protected CyclicBuffer cb = new CyclicBuffer(bufferSize);
protected Message msg;
protected TriggeringEventEvaluator evaluator;
/**
The default constructor will instantiate the appender with a
{@link TriggeringEventEvaluator} that will trigger on events with
level ERROR or higher.*/
public
SMTPAppender() {
this(new DefaultEvaluator());
}
/**
Use <code>evaluator</code> passed as parameter as the {@link
TriggeringEventEvaluator} for this SMTPAppender. */
public
SMTPAppender(TriggeringEventEvaluator evaluator) {
this.evaluator = evaluator;
}
/**
Activate the specified options, such as the smtp host, the
recipient, from, etc. */
public
void activateOptions() {
Properties props = new Properties (System.getProperties());
if (smtpHost != null)
props.put("mail.smtp.host", smtpHost);
Session session = Session.getInstance(props, null);
//session.setDebug(true);
msg = new MimeMessage(session);
try {
if (from != null)
msg.setFrom(getAddress(from));
else
msg.setFrom();
msg.setRecipients(Message.RecipientType.TO, parseAddress(to));
if(subject != null)
msg.setSubject(subject);
} catch(MessagingException e) {
LogLog.error("Could not activate SMTPAppender options.", e );
}
}
/**
Perform SMTPAppender specific appending actions, mainly adding
the event to a cyclic buffer and checking if the event triggers
an e-mail to be sent. */
public
void append(LoggingEvent event) {
if(!checkEntryConditions()) {
return;
}
event.getThreadName();
event.getNDC();
if(locationInfo) {
event.getLocationInformation();
}
cb.add(event);
if(evaluator.isTriggeringEvent(event)) {
sendBuffer();
}
}
/**
This method determines if there is a sense in attempting to append.
<p>It checks whether there is a set output target and also if
there is a set layout. If these checks fail, then the boolean
value <code>false</code> is returned. */
protected
boolean checkEntryConditions() {
if(this.msg == null) {
errorHandler.error("Message object not configured.");
return false;
}
if(this.evaluator == null) {
errorHandler.error("No TriggeringEventEvaluator is set for appender ["+
name+"].");
return false;
}
if(this.layout == null) {
errorHandler.error("No layout set for appender named ["+name+"].");
return false;
}
return true;
}
synchronized
public
void close() {
this.closed = true;
}
InternetAddress getAddress(String addressStr) {
try {
return new InternetAddress(addressStr);
} catch(AddressException e) {
errorHandler.error("Could not parse address ["+addressStr+"].", e,
ErrorCode.ADDRESS_PARSE_FAILURE);
return null;
}
}
InternetAddress[] parseAddress(String addressStr) {
try {
return InternetAddress.parse(addressStr, true);
} catch(AddressException e) {
errorHandler.error("Could not parse address ["+addressStr+"].", e,
ErrorCode.ADDRESS_PARSE_FAILURE);
return null;
}
}
/**
Returns value of the <b>To</b> option.
*/
public
String getTo() {
return to;
}
/**
The <code>SMTPAppender</code> requires a {@link
org.apache.log4j.Layout layout}. */
public
boolean requiresLayout() {
return true;
}
/**
Send the contents of the cyclic buffer as an e-mail message.
*/
protected
void sendBuffer() {
// Note: this code already owns the monitor for this
// appender. This frees us from needing to synchronize on 'cb'.
try {
MimeBodyPart part = new MimeBodyPart();
StringBuffer sbuf = new StringBuffer();
String t = layout.getHeader();
if(t != null)
sbuf.append(t);
int len = cb.length();
for(int i = 0; i < len; i++) {
//sbuf.append(MimeUtility.encodeText(layout.format(cb.get())));
LoggingEvent event = cb.get();
sbuf.append(layout.format(event));
if(layout.ignoresThrowable()) {
String[] s = event.getThrowableStrRep();
if (s != null) {
for(int j = 0; j < s.length; j++) {
sbuf.append(s[j]);
}
}
}
}
t = layout.getFooter();
if(t != null)
sbuf.append(t);
part.setContent(sbuf.toString(), layout.getContentType());
Multipart mp = new MimeMultipart();
mp.addBodyPart(part);
msg.setContent(mp);
msg.setSentDate(new Date());
Transport.send(msg);
} catch(Exception e) {
LogLog.error("Error occured while sending e-mail notification.", e);
}
}
/**
Returns value of the <b>EvaluatorClass</b> option.
*/
public
String getEvaluatorClass() {
return evaluator == null ? null : evaluator.getClass().getName();
}
/**
Returns value of the <b>From</b> option.
*/
public
String getFrom() {
return from;
}
/**
Returns value of the <b>Subject</b> option.
*/
public
String getSubject() {
return subject;
}
/**
The <b>From</b> option takes a string value which should be a
e-mail address of the sender.
*/
public
void setFrom(String from) {
this.from = from;
}
/**
The <b>Subject</b> option takes a string value which should be a
the subject of the e-mail message.
*/
public
void setSubject(String subject) {
this.subject = subject;
}
/**
The <b>BufferSize</b> option takes a positive integer
representing the maximum number of logging events to collect in a
cyclic buffer. When the <code>BufferSize</code> is reached,
oldest events are deleted as new events are added to the
buffer. By default the size of the cyclic buffer is 512 events.
*/
public
void setBufferSize(int bufferSize) {
this.bufferSize = bufferSize;
cb.resize(bufferSize);
}
/**
The <b>SMTPHost</b> option takes a string value which should be a
the host name of the SMTP server that will send the e-mail message.
*/
public
void setSMTPHost(String smtpHost) {
this.smtpHost = smtpHost;
}
/**
Returns value of the <b>SMTPHost</b> option.
*/
public
String getSMTPHost() {
return smtpHost;
}
/**
The <b>To</b> option takes a string value which should be a
comma separated list of e-mail address of the recipients.
*/
public
void setTo(String to) {
this.to = to;
}
/**
Returns value of the <b>BufferSize</b> option.
*/
public
int getBufferSize() {
return bufferSize;
}
/**
The <b>EvaluatorClass</b> option takes a string value
representing the name of the class implementing the {@link
TriggeringEventEvaluator} interface. A corresponding object will
be instantiated and assigned as the triggering event evaluator
for the SMTPAppender.
*/
public
void setEvaluatorClass(String value) {
evaluator = (TriggeringEventEvaluator)
OptionConverter.instantiateByClassName(value,
TriggeringEventEvaluator.class,
evaluator);
}
/**
The <b>LocationInfo</b> option takes a boolean value. By
default, it is set to false which means there will be no effort
to extract the location information related to the event. As a
result, the layout that formats the events as they are sent out
in an e-mail is likely to place the wrong location information
(if present in the format).
<p>Location information extraction is comparatively very slow and
should be avoided unless performance is not a concern.
*/
public
void setLocationInfo(boolean locationInfo) {
this.locationInfo = locationInfo;
}
/**
Returns value of the <b>LocationInfo</b> option.
*/
public
boolean getLocationInfo() {
return locationInfo;
}
}
class DefaultEvaluator implements TriggeringEventEvaluator {
/**
Is this <code>event</code> the e-mail triggering event?
<p>This method returns <code>true</code>, if the event level
has ERROR level or higher. Otherwise it returns
<code>false</code>. */
public
boolean isTriggeringEvent(LoggingEvent event) {
return event.getLevel().isGreaterOrEqual(Level.ERROR);
}
}
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