My Load Test

I like posting LoadRunner code snippets on My Load Test and, judging by the emails and comments that I get, a lot of people find them really useful. To make my code more readable, I have added syntax highlighting that uses the same colours you see in VuGen. If you would like to download a copy of the syntax highlighting code to use on your own blog or forum, or you would like to learn more about how I did it, read on…

There is a neat parser/highlighter called GeSHi, which stands for “Generic Syntax Highlighter”. This was originally developed for phpBB, but is now available for many other blogs and forums. If you are using WordPress, you will find that the WP-Syntax plugin uses GeSHi.

Even though LoadRunner supports a variety of languages (depending on the vuser type), just covering C (and maybe Java) should be enough for most of the code that I plan to share.

LoadRunner C

Here is a simple LoadRunner script as an example of how VuGen does syntax highlighting.

As you can see (if you click on the image to get the larger size), the following elements are coloured differently…

• Comments – Grey (RGB: 155,155,155). LoadRunner supports traditional C-sytle comments “/* */” and C++ style line comments “//”.
• Strings – Green (RGB: 0,128,128). Any text that is in double quote (or single quotes – I guess VuGen’s parser isn’t trying to verify correctness).
• Primitive Types – Blue (RGB: 0,0,255). Primitive types and their modifiers (short, int, long, void, char, float, double, const, enum, struct, union, typedef, etc)
• LoadRunner Parameters – Pink (RGB: 192,0,192). Any part of a string that is in {CurlyBraces}. It has always annoyed me that VuGen does not highlight parameters created with web_reg_save_param or lr_save_param. This is my opportunity to fix this.
• LoadRunner Functions – Brown (RBG: 138,0,0). The common LoadRunner functions that all start with “lr_”, and the protocol-specific functions that start with “web_”, “sapgui_”, etc.
• LoadRunner Constants – Blue. LoadRunner has a huge number of constants (LAST, EXTRARES, LR_AUTO, LR_PASS, LR_FAIL, etc)
• Control Structures – Blue. Looping and conditional statements (if, else, for, do, while, return, continue, break, switch, case, default, goto)
• Preprocessor Directives – Blue. C preprocessor macro definitions (#define, #include, etc)
• Operators, Functions, Variables – Black (RBG: 0,0,0). Basically, any language elements that are left over are coloured black.

Here is the code from the screenshot above in all its syntax-highlighted glory…

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Action()
{
    int i;
 
    // Google search for 10 different search terms.
    for (i=0; i<10; i++) {
 
        lr_start_transaction("Search");
 
        web_reg_find("Text=Your search - <b>{SearchTerm}</b> - did not match any documents.", "SaveCount=DidNotMatch", LAST);
        web_reg_find("Text={SearchTerm} - Google Search", LAST);
        web_url("search", 
            "URL=http://www.google.com.au/search?&q={SearchTerm}", 
            "Resource=0", 
            "RecContentType=text/html", 
            "Referer=http://www.google.com.au/", 
            "Snapshot=t2.inf", 
            "Mode=HTTP", 
            LAST);
 
        // If no results are returned for the search, fail the transaction.
        if (atoi(lr_eval_string("{DidNotMatch}")) != 0) {
            lr_error_message("No results found for %s", lr_eval_string("{SearchTerm}")); // Should have "Fail open transactions on lr_error_message" enabled in runtime settings.
        }
 
        lr_advance_param("SearchTerm");
 
        lr_end_transaction("Search", LR_AUTO);
 
        lr_think_time(5); // Limit search rate or get banned by Google.
    }
 
    return 0;
}

If you would like to add this feature to your own blog, install GeSHi (or a plugin which uses it), and drop the c_loadrunner.php file I created into the ./geshi directory that contains the files that support all the other languages. Enjoy.

This entry was posted on Sunday, July 25th, 2010 at 1:48 pm and is filed under LoadRunner.