How to replace attributes in XML transforms without the name attribute - asp.net

I am using SlowCheetah to transform my Log4Net files when I publish. However, it can't seem to distinguish between the attributes in different appender sections.
My Log4Net.config looks basically like this:
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="DevEmail" />
<from value="DevEmail" />
<subject value="Dev Warning" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="Time: %date%newlineHost: %property{log4net:HostName}%newlineClass: %logger%newlineUser: %property{user}%newlineMessage: %message%newline%newline%newline" />
</layout>
<threshold value="WARN" />
</appender>
<appender name="FatalSmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="DevEmail" />
<from value="DevEmail" />
<subject value="Dev Fatal" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="Time: %date%newlineHost: %property{log4net:HostName}%newlineClass: %logger%newlineUser: %property{user}%newlineMessage: %message%newline%newline%newline" />
</layout>
<threshold value="FATAL" />
</appender>
</log4net>
And my transform file looks like this:
<?xml version="1.0" encoding="utf-8" ?>
<log4net xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="ProductionEmail" xdt:Transform="SetAttributes" />
<from value="ProductionEmail" xdt:Transform="SetAttributes" />
<subject value="Production Warning" xdt:Transform="SetAttributes" />
</appender>
<appender name="FatalSmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="ProductionEmail" xdt:Transform="SetAttributes" />
<from value="ProductionEmail" xdt:Transform="SetAttributes" />
<subject value="Production Fatal" xdt:Transform="SetAttributes" />
</appender>
</log4net>
The problem is that the transformed config has the same subject attribute value for both appenders; I guess when it hits the SetAttributes it can't tell which tag it's looking for, so it transforms all of them. What it the correct syntax to tell it to only find the elements within the same appender? I assume I need to use the xdt:Locator attribute, but I can't do Match(name) like I do for web.config because these elements don't have a name attribute. The appender element has a name attribute, but I don't know how to tell it to match based on the parent element's name.
I know that I could use replace on the appender node, with the match(Name), but then I would be replacing the entire node, including a bunch of elements such as the layout which I don't want to be transformed (and thus have multiple copy-pastes of the same code, which I would like to avoid).

I found the answer in this MSDN article: http://msdn.microsoft.com/en-us/library/dd465326.aspx.
I needed to use xdt:Locator="Match(name)" on the parent <appender> node, and then xdt:Transform on the child nodes. I had tried this previously but had used xdt:locator="Match(name)" instead of xdt:Locator="Match(name)"... The attribute is case sensitive.

Related

Web.config transformation locator condition or xpath not working with multiple attributes

I'm using Microsoft's XDT library to transform my web.config files and discovered that Locator is not working as expected. Using the example below, I would expect that both the attributes are set and the converter node is inserted in all three appenders, but only the attributes are updated in all three. The converter node is only inserted into the first appender. How do I get it to insert into all three log4net appender nodes?
I've tried switching to XPath, but it only throws errors. A working example would be nice, because every example I've followed so far seems to fail with an error.
Test site: https://webconfigtransformationtester.apphb.com/
For example:
Web.config
<?xml version="1.0"?>
<configuration>
<log4net>
<appender name="App1">
<layout>
<conversionPattern value="foo"/>
</layout>
</appender>
<appender name="App2">
<layout>
<conversionPattern value="foo"/>
</layout>
</appender>
<appender name="App3">
<layout>
<conversionPattern value="foo"/>
</layout>
</appender>
</log4net>
</configuration>
Web.Debug.config
<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<log4net>
<appender xdt:Locator="Condition(#name='App1' or #name='App2' or #name='App3')">
<layout>
<conversionPattern value="bar" xdt:Transform="SetAttributes" />
<converter xdt:Transform="Insert">
<name value="Default" />
<type value="Common.DefaultConverter, Common" />
</converter>
</layout>
</appender>
</log4net>
</configuration>
Results:
<?xml version="1.0"?>
<configuration>
<log4net>
<appender name="App1">
<layout>
<conversionPattern value="bar" />
<converter><name value="Default" /><type value="Common.DefaultConverter, Common" /></converter></layout>
</appender>
<appender name="App2">
<layout>
<conversionPattern value="bar" />
</layout>
</appender>
<appender name="App3">
<layout>
<conversionPattern value="bar" />
</layout>
</appender>
</log4net>
</configuration>
It turns out that it was designed this way. Only attributes are applied to all target nodes. To work around the issue, download the code from here and add the following lines:
In XmlElementContext, add the property:
internal bool HasLocator
{
get
{
return this.LocatorAttribute != null || (this.parentContext != null && this.parentContext.HasLocator);
}
}
In XmlTransform modify this line, adding the call to HasLocator:
if (ApplyTransformToAllTargetNodes || context.HasLocator) {
This code will determine if a "Locator" has been set within the current context or any parent context (like in my example) and apply all transforms to all target nodes.

Writing different levels to different files in log4cxx

I want to have log messages from each log level go to a different file. From the name, LevelMatchFilter seems like what I want, except it seems to not filter anything from a different level.
I think the following properties should do that using LevelRangeFilter. However, anything sent to the global logger ends up in INFO.log, regardless of the level.
log4j.rootLogger = OFF
# Global level based logs
log4j.logger.global = ALL, Info
log4j.appender.Info=org.apache.log4j.FileAppender
log4j.appender.Info.File=Logs/INFO.log
log4j.appender.Info.layout=org.apache.log4j.PatternLayout
log4j.appender.Info.layout.ConversionPattern=%d [%p] %m%n
log4j.appender.Info.filter.a=org.apache.log4j.filter.LevelRangeFilter
log4j.appender.Info.filter.a.LevelMin=info
log4j.appender.Info.filter.a.LevelMax=info
log4j.appender.Info.filter.a.AcceptOnMatch=true
I also tried using INFO for the values of LevelMin and LevelMax but that had the same results.
What am I doing wrong?
As a side question, is there a way to turn on debugging of the log4cxx configuration when using a property file? I found an option when using an xml file, but none of the obvious translations to properties (debug=true, log4j.debug=true) and any effect.
As of log4cxx 0.10 (and probably earlier), the properties format does not support filters. So the XML configuration (or programmatic configuration) is required.
<?xml version="1.0" encoding="UTF-8" ?>
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="true">
<appender name="Info" class="org.apache.log4j.FileAppender">
<param name="file" value="Logs/INFO.log" />
<param name="append" value="false" />
<!-- If this filter accepts the message, it will be printed. That happens if this is an info message -->
<filter class="org.apache.log4j.filter.LevelMatchFilter">
<param name="levelToMatch" value="INFO" />
<param name="acceptOnMatch" value="true" />
</filter>
<!-- If it is not an info message, this filter will reject it -->
<filter class="org.apache.log4j.filter.DenyAllFilter"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d [%p] %m%n" />
</layout>
</appender>
<root>
<priority value="off" />
</root>
<logger name="global">
<priority value="all" />
<appender-ref ref="Info" />
</logger>
</log4j:configuration>

Does the Log4net SMTPAppender send email Asynchronously?

Does the Log4net SMTPAppender send email asynchronously? If it doesn't, how can I send logging emails asynchronously?
My log4net.config is:
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net>
<appender name="SMTPAppender" type="log4net.Appender.SMTPAppender">
<authentication value="Basic" />
<to value="xxx#xx.com" />
<from value="yyy#xx.com" />
<username value="yyy#xx.com" />
<password value="yyy" />
<subject value="xxx" />
<smtpHost value="smtp.xx.com" />
<lossy value="true" />
<evaluator type="log4net.Core.LevelEvaluator">
<threshold value="WARN" />
</evaluator>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%date [%thread] %-5level %logger %newline %message%newline%newline%newline" />
</layout>
</appender>
<root>
<level value="INFO"></level>
</root>
<logger name="MyLogger">
<level value="INFO"></level>
<appender-ref ref="SMTPAppender"></appender-ref>
</logger>
</log4net>
</configuration>
You could just call the logging method asynchronously like this:
Task.Factory.StartNew(() => log.Info("Message I want to email"));
I actually got this suggestion from the following SO article:
How do I create an asynchronous wrapper for log4net?
There is a simple workaround before the solid solution is released.
public class SmtpAsyncAppender : SmtpAppender
{
protected override void SendEmail(string messageBody)
{
Task.Run(() => base.SendEmail(messageBody));
}
}
It presumes that SmtpAppender.SendEmail is thread-safe and reenterable. It is for log4net v1.2.13.0 and there is no reason not to be in the future.
Log4net has not built in appender that is asynchronous. If you need that functionality you need to write your own appender. Downloading the log4net source code should get you started...

unique log file with log4net

hi i'm using log4net for logging my website.
Every day a new file is created like "filename.log24-06-2009"
this is the code in the web.config file:
<log4net>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="App_Data\Missioni.log" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<!--<datePattern value="yyyy-MM-dd" />-->
<maxSizeRollBackups value="5" />
<maximumFileSize value="5MB" />
<layout type="log4net.Layout.PatternLayout">
<header value="[Header]
" />
<footer value="[Footer]
" />
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingLogFileAppender" />
</root>
</log4net>
How can i do for use a unique log file?
thanks
The question' a bit unclear, so please comment if I'm off. If you want to change how the files are created, uncomment the datePattern block and you can specify the file name layout, for example if you wanted the log to change monthly:
<datePattern value="yyyy-MM" />
When the pattern changes (midnight with the standard datePattern) a new file is created, change the pattern to so it only rolls to a new file when you want.

Can't get Log4Net to work in my ASP.NET website :(

really simple question -> i can't seem to get any data from Log4Net in my ASP.NET application. I've got a simple ASP.NET website, which references a class library. In this class library, I have some lines that call the logger.
I'm trying to read the log4net output data in my Visual Studio 2008 debugging Output window.
Here's my code and my configuration...
//Class Library project
//File: Foo.cs
public class FooService
{
private static readonly ILog log = LogManager.GetLogger(typeof(FooService));
public FooService()
{
// NOTE: To play with my L4N settings, I'll call Debug once, then Info once.
log.Info("Starting Constructor");
// ... snip ...
log.Debug("Leaving Constructor");
}
}
// ASP.NET Website project
// File: global.asax
void Application_Start(object sender, EventArgs eventArgs)
{
log4net.Config.XmlConfigurator.Configure();
}
// File: Whatever.aspx.cs
// A delegate method (when a user clicks a button) creates the FooService() instance.
// File: web.config
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler" requirePermission="false" />
// ....
</configSections>
<log4net>
<appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
<mapping>
<level value="ERROR" />
<foreColor value="White" />
<backColor value="Red, HighIntensity" />
</mapping>
<mapping>
<level value="DEBUG" />
<backColor value="Green" />
</mapping>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
</appender>
<appender name="OutputDebugStringAppender" type="log4net.Appender.OutputDebugStringAppender">
<mapping>
<level value="ERROR" />
<foreColor value="White" />
<backColor value="Red, HighIntensity" />
</mapping>
<mapping>
<level value="DEBUG" />
<backColor value="Blue" />
</mapping>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="App_Data\logging\log-append.txt"/>
</appender>
<!-- Setup the root category, add the appenders and set the default level -->
<root>
<level value="ALL" />
<appender-ref ref="OutputDebugStringAppender" />
<appender-ref ref="ConsoleAppender" />
<appender-ref ref="ColoredConsoleAppender" />
</root>
<!-- Specify the level for some specific categories -->
<logger name="DotNetOpenAuth">
<level value="ALL" />
</logger>
</log4net>
Cheers for any help or suggestions...
EDIT: Added the RollingLogFileAppender.
I had this same problem and I think it was looking at the wrong web.config or something. I finally separated out log4net.config from web.config and put a path to it \inetpub\Logs\log4net.config and all is well.
UDPATED ON REQUEST: edited from a slightly more complicated version.
<?xml version="1.0" encoding="utf-8"?>
<log4net>
<appender name="TraceAppender" type="log4net.Appender.TraceAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level (%logger:%line) - %message%newline" />
</layout>
</appender>\
<root>
<!--ALL, DEBUG, INFO, WARN, ERROR, FATAL, OFF-->
<level value="ALL" />
<appender-ref ref="TraceAppender" />
</root>
</log4net>
And it is configured in code as follows:
var logpath = WebConfigurationManager.AppSettings["LogConfigPath"] ?? #"\Inetpub\Logs\log4net.config";
var finfo = new System.IO.FileInfo ( logpath );
XmlConfigurator.Configure( finfo );
ASP.Net has restriction on usage of filesystem access, so try to explicitly point directory under App_Data (were it is allowed)
Here my working sample:
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="App_Data\logging\log-file.txt"/>
Or with rollover
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="App_Data\logging\log-append.txt"/>
Ok, found the answer. I needed to use a TraceAppender.
The application configuration file
can be used to control what listeners
are actually used. See the MSDN
documentation for the Trace class for
details on configuring the trace
system.
Events are written using the
System.Diagnostics.Trace.Write(string,string)
method. The event's logger name is
passed as the value for the category
name to the Write method.
Here's my config file data...
<log4net>
<appender name="TraceAppender" type="log4net.Appender.TraceAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<!-- Setup the root category, add the appenders and set the default level -->
<root>
<level value="ALL" />
<appender-ref ref="TraceAppender" />
</root>
</log4net>
There are atleast 2 possible problems:
The way the address to the file is specified, try using an absolute path instead.
The process making the call needs rights to modify the file. Check that the user account making writing to the log file has rights to do so.
To debug it I would create and empty directory, give everyone full control, configure to log to that directory. Then test it, see that it works, then gradually tighten the security to an acceptable level.
I added the following line Global.asax file, and it works..!!
log4net.Config.XmlConfigurator.Configure();

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