I have just started playing around with Log4Net... I now want to send an email with the full log either attached or directly in the mail. The problem with using SmtpAppender is that it requires a bufferSize which will be unknown because it should send the mail whether it's full of errors or just info.
Update: My config file
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="ebb#mail.com" />
<from value="ebb#mail.com" />
<subject value="Backup Application - Log" />
<smtpHost value="mailserver" />
<authentication value="1" />
<username value="userName" />
<password value="mypw" />
<port value ="25"/>
<lossy value="true" />
<bufferSize value="500" />
<evaluator type="log4net.Core.LevelEvaluator">
<threshold value="ALL"/>
</evaluator>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%timestamp [%thread] %-5level %logger – %message%newline" />
</layout>
</appender>
BufferSize equals to the number of log messages that have to be buffered (ie if you set to 512 the mail will be sent once 512 messages have been collected).
I believe that setting it to int.MaxValue (which is 2.147.483.647) is a reasonable choice. 2 billions of messages are too much for a system, even long-running.
If you give me 10 minutes I'll confirm you (from source code) that if you clean stop your application, all logs collected so far will be sent
[Update]: confirmed!! Destructor flushes the queue as expected
[Add] I would remove both lossy and evaluator. Your problem is clear: Evaluator has precedence over buffer :) :)
The evaluator is used to flush the queue when a certain condition is met. Your condition equals to true. When this condition is triggered, the email is sent, so this is why the mail is sent at every single log call.
This is slightly different from sending ONLY info and error messages, which is achieved by log filtering.
Remove the two attributes and your code will work. Setting int.MaxValue will allow you to store the maximum possible number of messages. It's unlikely (you'd better win the Superenalotto's 178mln€ jackpot like some guys did tonight, or being hit by a comet in your head) that an application collects more than 2 billion errors/info in a run.
Related
Does log4net support circular logging? (I think that's the right term.)
I want to maintain the last N entries in a log file. Say N=100. If I have 100 entries and then add a 101st, the desired behavior would be to delete the 1st entry from the top of the file and add the new log entry at the bottom, so that there is always 100 (or fewer) entries, with the oldest entry at the top and the newest at the bottom.
Basically, I want to record a couple of pieces of information to a file every minute. I only am interesting in seeing/keeping the last 100 entries. I could roll my own solution, but I'm already using log4net for logging other issues and was hoping I could use it for this purpose, as well.
Thanks
Out of the box solution would be RollingFileAppender with Size limit. You cannot specify how many entries you want to keep in the file, but if you play with the size (lets say 100KB), you can get what you want.
Here is an example:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="log.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="0" />
<maximumFileSize value="100KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
And some documentation about why setting maxSizeRollBackups is important in this case:
If set to zero, then there will be no backup files and the log file
will be truncated when it reaches MaxFileSize.
MaxSizeRollBackups RollingMode
I'm working on a wpf application that uses log4net. It currently logs to a single file and only rolls over when it grows too large. I am trying to modify this so that it grows over when the file grows too large, when the date changes, or when the application is relaunched.
I am trying to get output as close to the following as possible
App_2017-07-06.0.txt //First launch on 2017-07-06
App_2017-07-06.1.txt //Rollover due to size limit
App_2017-07-06.2.txt //Application relaunch
App_2017-07-06.3.txt //Rollover due to size limit
App_2017-07-07.0.txt //Rollover due to date change
App_2017-07-07.1.txt //Rollover due to size limit
App_2017-07-07.2.txt //Application relaunch - Currently Logging File
From what I understand from the documentation, The rolling style can be set to "compostite" to capture date and size or it can be set to "once" to capture application relaunches. It doesn't seem to have a way to do all 3: http://logging.apache.org/log4net/release/sdk/html/T_log4net_Appender_RollingFileAppender_RollingMode.htm
I got it to the point where everything looks correct and works except the application relaunch overwrites a pre existing file (I imagine because of the appendToFile property). I just cant seem to get it working the way I need to and I can't find any answers in the documentation.
This question seems to be trying to achieve a similar goal, but did not solve my problem:
How do I force a rollover at application startup with Log4net RolloverFileAppender?
Am I missing something? Is it just not possible to do this with log4net?
My current configuration
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="Log\App.txt" />
<appendToFile value="false" />
<rollingStyle value="Composite" />
<maximumFileSize value="10KB" />
<maxSizeRollBackups value="-1" />
<staticLogFileName value="false" />
<preserveLogFileNameExtension value="true" />
<countDirection value="1" />
<lockingModel type="log4net.Appender.RollingFileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %level User = %username Class = %property{ClassName} Method = %property{MethodName}%newlineMessage - %message%newline%exception%newline***************************************" />
</layout>
</appender>
My current output
App_2017-07-06.0.txt //First launch on 2017-07-06
App_2017-07-06.1.txt //Rollover due to size limit
App_2017-07-06.1.txt //Application relaunch - overwrites pre-existing file
App_2017-07-06.2.txt //Rollover due to size limit
App_2017-07-07.0.txt //Rollover due to date change
App_2017-07-07.1.txt //Rollover due to size limit
App_2017-07-07.1.txt //Application relaunch - overwrites pre-existing file - Currently logging file
As far as I know log4net copies the log file to xxxx.{number}.txt when it rolls over to the next file. So your first App_2017-07-06.1.txt was never created and is still called App_2017-07-06.txt when the application restarts. You have configured so App_2017-07-06.txt will be overridden and your first App_2017-07-06.1.txt was never created.
You can configure <appendToFile value="true" /> to not override the existing file.
I'm making a vehicle tracking application(ASP.NET MVC C#). I have windows service that takes data sent by GPS device. In the service I have written the code to Log the data.
Now consider a normal logging scenario in which i have only one GPS device.
08:00:24 Inside OnDataAvailable Method
08:00:25 Data Received - Device Id: 2 Data: abcdefghijkl
08:00:25 Leaving OnDataAvailable
and few more statements. and then it repeats
Now when I have more than one GPS device sending data, the log gets mixed. That is I have following kind of log:
08:00:23 Inside OnDataAvailable Method 08:00:24 Inside OnDataAvailable
Method
08:00:25 Data Received - Device Id: 2 Data: abcdefghijkl
08:00:25 Leaving OnDataAvailable
08:00:26 Data Received - Device Id: 1 Data: abcdefghijkl
08:00:26 Leaving OnDataAvailable
Now what I want to achieve is that, I should have different log files for different devices. So for device with Id 1 I have Log_D1.txt, For Device Id 2, Log_D2.txt.
Would appreciate if someone can point me in the right direction.
You should be able to use one of the context objects (like ThreadContext.Properties) to build the filename. You can configure the log file name to use properties to build up the name. So, in your case, you might store the device id in the context (are your requests being handled in separate threads?).
This article has a good explanation of how this works:
http://geekswithblogs.net/rgupta/archive/2009/03/03/dynamic-log-filenames-with-log4net.aspx
To summarize, you can configure your appender something like this:
<appender name="RollingFileAppenderV1" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="F:\HornetFeed\Log_%property{DeviceID}" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="-1" />
<maximumFileSize value="5000KB" />
<staticLogFileName value="true" />
<countDirection value="1"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%m%n" />
</layout>
<filter type="log4net.Filter.PropertyFilter">
<Key value="Version" />
<StringToMatch value="1" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
</appender>
Note the use of %property in the filename specification.
Then, in your code, you might do something like this:
private void OnDataAvailable(string id, int data)
{
ThreadContext.Properties["DeviceID"] = id;
logger.Info("Inside OnDataAvailable");
logger.Info("Leaving OnDataAvailable");
}
All log messages, at least in cases where the DeviceID property has been set, should be segregated into separated files, named, in part, by the DeviceID.
I have a WCF service running on a single server, using Log4net to track usage via INFO and WARN level log entries. Using a RollingFileAppender with the following very standard config:
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="\\mylocation\data\PRD\myApp\MyService"/>
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="-yyyy-MM-dd'.log'" />
<staticLogFileName value="false" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="RollingLogFileAppender" />
<appender-ref ref="ADONetAppender_SqlServer" />
</root>
I also use an ADONetAppender, which receives redirected "WARN" level data and writes it to a DB table in SQL server via a stored procedure. The config for this is a bit long, so I have omitted it for readability.
I have this setup in our Dev and TST environments where it has been running fine. In the PRD environment, it seems to generate duplicate log files. The first is named according to my specified pattern i.e. "logfile-yyyy-mm-dd.log". The second file looks like an addition to the first, with the date pattern duplicated i.e. "logfile-yyyy-mm-dd.log.-yyyy-mm-dd.log".
Making this more interesting is that entries contained in the two files overlap by time. File 1 might have entries from 8am to 12am, and file 2 will also contain entries from the same time period. The entries are not duplicates, they are generated by different users of the service. The copies of Files 1 and 2 can be pretty much any size, so this is not an issue of reaching a size or date/time threshold and generating the next required log file.
The DB table entries contain all the expected rows, some contained in each of the log files. These rows are generated only by WARN level logging, and some WARNings appear in each log file.
I have bounced this off some log4net savvy folks in our shop, but nobody has a good idea of what might be causing this duplicate file behavior. Any ideas from Stackland appreciated.
Your date pattern shouldn't have .log after it. I also am unsure why you have two appenders declared in the root. You should be able to get rid of the root altogether, given the rest of your config it has no purpose (assuming you don't have more that isn't in the example).
I've found that this happens when the file being logged to is locked by another thread or process.
I'm assuming Log4Net creates the other file because it can't log to the configured logfile and thus creates a new file and logs to it, but I'd have to go through the log4net code to be sure of that assumption.
Try adding
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
to the appender element to minimize the amount of locking. Just be aware that there is additional overhead associated with using MinimalLock: http://logging.apache.org/log4net/release/sdk/log4net.Appender.FileAppender.MinimalLock.html
I had the same exact problem.
I confirm that was a permission issue. In my case the logfiles were generated by two different accounts (from a scheduled task and sometimes by a manual run via console), and in this case the file name had a duplicate date pattern.
After resetting the permissions to both users (the scheduled process user and the interactive users) the issue did not repeat anymore.
Greets,
Michele
I've got this settings for log4net in the log4net.config to allow multiple threads to write to the same file:
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
<!-- Minimal locking to allow multiple threads to write to the same file -->
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<file value="log\UI.log"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<maxSizeRollBackups value="30"/>
<datePattern value="-yyyyMMdd"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%date [%thread] %-5level [%property{identity}] %logger{3} - %message%newline"/>
</layout>
</appender>
But after midnight the new created log file is being overwritten all the time and thus there is only the last one event in the file. After server restart it all goes right again till the next midnight.
So can anyone say whether this is a config issue or this is just a log4net issue?
The problem was solved by removing the locking model key since I have only one process (IIS, w3wp.exe) which uses the same logger.
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
Since it was said here:
If you use RollingFileAppender things become even worse as several process may try to start rolling the log file concurrently. RollingFileAppender completely ignores the locking model when rolling files, rolling files is simply not compatible with this scenario.
I think you will get unpredictable results.
My guess is that your use of a - sign on the datePattern is confusing the framework so that after the first roll any log triggers a roll event.
What happens when you try this with
<datePattern value="yyyyMMdd" />
per the example here.
To change the rolling period adjust the DatePattern value. For
example, a date pattern of "yyyyMMdd" will roll every day. See
System.Globalization.DateTimeFormatInfo for a list of available
patterns.