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By default, a variable s definition is known only to the shell in which it is defined (and to subshells of that shell). The script that called the current script will not know about it, and a script called by the current script will not know about the variable unless it is exported to the environment. The environment is an array of strings of the form name=value. Whenever an external command is executed (creating a child process), whether it is a compiled, binary command or an interpreted script, this array is passed to it behind the scenes. In a shell script, these strings are available as variables. Variables assigned in a script may be exported to the environment using the shell builtin command export: var=whatever export var There is no need to export a variable unless you want to make it available to scripts (or other programs) called from the current script (and their children and their children s children and...). Exporting a variable doesn t make it visible anywhere except child processes. Listing 5-1 tells you whether the variable $x is in the environment and what it contains, if anything. Listing 5-1. showvar, Print Value of Variable x if [ "${x+X}" = X ] ## If $x is set then if [ -n "$x" ] ## if $x is not empty

Init()

This method allows an HTTP module to register its event handlers to receive the events of the HttpApplication object. This method provides the current HttpApplication object for the request as a parameter. This method gives an HTTP module an opportunity to perform any cleanup before the object gets garbage collected.

Dispose()

path(self)

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The following class is a custom HTTP module that handles the event HttpApplication.AuthenticateRequest and then logs the user information to a new entry in the Windows event log using the EventLog class from the System.Diagnostics namespace. To use this example, the account used to run ASP .NET code must have permission to write to the event log. using System; using System.Web; using System.Diagnostics; namespace HttpExtensions { public class LogUserModule : IHttpModule { public void Init(HttpApplication httpApp) { // Attach application event handlers. httpApp.AuthenticateRequest += new EventHandler(OnAuthentication); } private void OnAuthentication(object sender, EventArgs a) { // Get the current user identity. string name = HttpContext.Current.User.Identity.Name; // Log the user name. EventLog log = new EventLog(); log.Source = "Log User Module"; log.WriteEntry(name + " was authenticated."); } public void Dispose() {} } } Now you can register the module with the following information in the web.config file. Here s an example that assumes it s compiled in a separate assembly named HttpExtensions.dll: <httpModules> <add name="LogUserModule" type="HttpExtensions.LogUserModule,HttpExtensions" /> </httpModules> To test this module, request any other page in the web application. Then check the entry in the Windows application event log. (To view the log, select Programs Administrative Tools Event Viewer from the Start menu.) Figure 5-15 shows the logged messages.

Figure 5-15. Logging messages with an HTTP module In Part 4, you ll see a more detailed example that uses an HTTP module to perform custom authentication.

The previous example shows how you can handle application events in a custom HTTP module. However, some global events aren t provided by the HttpApplication class but are still quite important. These include events raised by other HTTP modules, such as the events fired to start and end a session. Fortunately, you can wire up to these events in the Init() event; you just need a slightly different approach. The HttpApplication class provides a collection of all the modules that are a part of the current HTTP pipeline through the Modules collection. You can retrieve a module by name and then use delegate code to connect an event handler. For example, if you want to connect an event handler named OnSessionStart() to the SessionStateModule.Start event, you could use code like this for the Init() method in your HTTP module: public void Init(HttpApplication httpApp) { SessionStateModule sessionMod = httpApp.Modules["Session"]; sessionMod.Start += new EventHandler(OnSessionStart); }

This returns the path of the file, if it s stored on the local filesystem. For files stored on other backends, which can t be accessed with Python s built-in function, this will raise an , because the corresponding method isn t available on the related storage system object.

Summary

In this chapter, you took a closer look at what constitutes an ASP.NET application. After learning more about the life cycle of an application, you learned how to code global application event handlers with the global.asax file and how to set application configuration with the web.config file. Finally, you learned how to use separately compiled components in your web pages and how to extend the HTTP pipeline with your own handlers and modules.

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