Modify Common Parameters in Multiple Scripts Using Additional Attributes

 Problem statement: Your performance regression scenario contains 20 different Loadrunner scripts. You run this scenario a number of times in a given release. For simplicity, let’s assume that all scripts are developed using web services protocol. There may or may not be any changes to the scripts but version of the service endpoint changes a lot of times. For example, from version R200 to version R300

From http://ServerName:Port/R200/CustomerDataManagement.svc
To http://ServerName:Port/R300/CustomerDataManagement.svc

How to modify all the endpoints to have latest version, possibly without opening the scripts?

Solution 1: One trivial solution which would come to everyone’s mind is to create a parameter, say pEndpointVersion, and use that in the URL as shown below

http://ServerName:Port/{pEndpointVersion}/CustomerDataManagement.svc

Drawback: You will have to update the parameter value every time the endpoint version changes. Thus, you will have to download, open and update the parameter in all the scripts. This activity is very time consuming especially when it comes to VUGEN 11.52 as we all know how slow it is for opening scripts. Have a look a solution 2.

Solution 2 (preferred): In your script, go to RunTime Settings(RTS) under ‘Additional Attributes’, add a new argument name and a argument value. For example: argument name ‘EndpointVersion’ with argument value ‘R300’.

Then use the statement lr_get_attrib_string(“<Argument Name>“) to retrieve the argument value. In our example, use lr_get_attrib_string(“EndpointVersion“) to retrieve the value ‘R300’.

You can output the value like this

lr_output_message("*******version: %s", lr_eval_string(lr_get_attrib_string("EndpointVersion")));

OR save it into a parameter via lr_save_string() and access it anywhere in the script using the parameter name. For example,

lr_save_string(lr_get_attrib_string(("EndpointVersion")),"rVersion");

The endpoint will look like http://ServerName:Port/{rVersion}/CustomerDataManagement.svc
Example:

lr_output_message("*******version: %s", lr_eval_string(lr_get_attrib_string("EndpointVersion")));
lr_save_string(lr_get_attrib_string(("EndpointVersion")),"rVersion");

Output
Action.c(25): *******version: R300
Action.c(27): Notify: Saving Parameter “rVersion = R300”.

Benefit: If the endpoint version changes, you can modify the RunTime Settings (RTS) for all the scripts in the scenario in Performance Center itself. You don’t need to open and update it in individual scripts. If all the scripts use same RTS, then it’s even easier. Just modify RTS of one script and duplicate the RTS to rest of the scripts. Following screenshot shows the location of ‘Duplicate Runtime Settings’ option in Performance Center.

In Truclient protocol script, the function is LR.getLRAttr(“<attrib_name>”);

Refer for details: VUGEN help > VuGen > Protocols > Ajax TruClient Protocol > Enhancing Ajax TruClient Scripts > Ajax TruClient Functions

Hope it helps to someone!

Base64 Encode/Decode for LoadRunner

 #include "base64.h"

vuser_init()

{

 int res;

 // ENCODE

 lr_save_string("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789","plain");

 b64_encode_string( lr_eval_string("{plain}"), "b64str" );

 lr_output_message("Encoded: %s", lr_eval_string("{b64str}") );

 

 // DECODE

 b64_decode_string( lr_eval_string("{b64str}"), "plain2" );

 lr_output_message("Decoded: %s", lr_eval_string("{plain2}") );

 

 // Verify decoded matches original plain text

 res = strcmp( lr_eval_string("{plain}"), lr_eval_string("{plain2}") );

 if (res==0) lr_output_message("Decoded matches original plain text");

 

 return 0;

}

And here’s the actual base64.h include file

/*

Base 64 Encode and Decode functions for LoadRunner

==================================================

This include file provides functions to Encode and Decode

LoadRunner variables. It's based on source codes found on the

internet and has been modified to work in LoadRunner.

 

Created by Kim Sandell / Celarius - www.celarius.com

*/

// Encoding lookup table

char base64encode_lut[] = {

'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q',

'R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h',

'i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y',

'z','0','1','2','3','4','5','6','7','8','9','+','/','='};

 

// Decode lookup table

char base64decode_lut[] = {

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0,62, 0, 0, 0,63,52,53,54,55,56,57,58,59,60,61, 0, 0,

0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,

15,16,17,18,19,20,21,22,23,24,25, 0, 0, 0, 0, 0, 0,26,27,28,

29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,

49,50,51, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };

 

void base64encode(char *src, char *dest, int len)

// Encodes a buffer to base64

{

 int i=0, slen=strlen(src);

 for(i=0;i<slen && i<len;i+=3,src+=3)

 { // Enc next 4 characters

 *(dest++)=base64encode_lut[(*src&0xFC)>>0x2];

 *(dest++)=base64encode_lut[(*src&0x3)<<0x4|(*(src+1)&0xF0)>>0x4];

 *(dest++)=((i+1)<slen)?base64encode_lut[(*(src+1)&0xF)<<0x2|(*(src+2)&0xC0)>>0x6]:'=';

 *(dest++)=((i+2)<slen)?base64encode_lut[*(src+2)&0x3F]:'=';

 }

 *dest='\0'; // Append terminator

}

 

void base64decode(char *src, char *dest, int len)

// Encodes a buffer to base64

{

 int i=0, slen=strlen(src);

 for(i=0;i<slen&&i<len;i+=4,src+=4)

 { // Store next 4 chars in vars for faster access

 char c1=base64decode_lut[*src], c2=base64decode_lut[*(src+1)], c3=base64decode_lut[*(src+2)], c4=base64decode_lut[*(src+3)];

 // Decode to 3 chars

 *(dest++)=(c1&0x3F)<<0x2|(c2&0x30)>>0x4;

 *(dest++)=(c3!=64)?((c2&0xF)<<0x4|(c3&0x3C)>>0x2):'\0';

 *(dest++)=(c4!=64)?((c3&0x3)<<0x6|c4&0x3F):'\0';

 }

 *dest='\0'; // Append terminator

}

 

int b64_encode_string( char *source, char *lrvar )

// ----------------------------------------------------------------------------

// Encodes a string to base64 format

//

// Parameters:

//        source    Pointer to source string to encode

//        lrvar     LR variable where base64 encoded string is stored

//

// Example:

//

//        b64_encode_string( "Encode Me!", "b64" )

// ----------------------------------------------------------------------------

{

 int dest_size;

 int res;

 char *dest;

 // Allocate dest buffer

 dest_size = 1 + ((strlen(source)+2)/3*4);

 dest = (char *)malloc(dest_size);

 memset(dest,0,dest_size);

 // Encode & Save

 base64encode(source, dest, dest_size);

 lr_save_string( dest, lrvar );

 // Free dest buffer

 res = strlen(dest);

 free(dest);

 // Return length of dest string

 return res;

}

 

int b64_decode_string( char *source, char *lrvar )

// ----------------------------------------------------------------------------

// Decodes a base64 string to plaintext

//

// Parameters:

//        source    Pointer to source base64 encoded string

//        lrvar     LR variable where decoded string is stored

//

// Example:

//

//        b64_decode_string( lr_eval_string("{b64}"), "Plain" )

// ----------------------------------------------------------------------------

{

 int dest_size;

 int res;

 char *dest;

 // Allocate dest buffer

 dest_size = strlen(source);

 dest = (char *)malloc(dest_size);

 memset(dest,0,dest_size);

 // Encode & Save

 base64decode(source, dest, dest_size);

 lr_save_string( dest, lrvar );

 // Free dest buffer

 res = strlen(dest);

 free(dest);

 // Return length of dest string

 return res;

}