Forum Discussion

konerus's avatar
konerus
Adept
5 years ago

Is logging possible in Khoros?

Is there a way to log information of User Id and the kind of a variable when it hits certain code?
jeffshurtliff's avatar
jeffshurtliff
Boss
5 years ago

I suppose it depends on what kind of logging you're hoping to accomplish.

For example, one option is to use the FreeMarker logging utilities if you're wanting some server-side logging to occur.

Alternatively, if you are wanting to have some client-side logging for troubleshooting/debugging purposes in the browser console (i.e. Developer Tools > Console), then you can leverage jQuery to do this.

In our environment, I created a macro called custom.macro.logging.ftl to simplify client-side logging in our customizations, which looks like this:

<#------------------------------------------------
  Functions and Macros for Logging and Debugging
  Created By:           Jeff Shurtliff
  Last Modified By:     Jeff Shurtliff
  Last Modified Date:   2020-11-03
------------------------------------------------->

<#-------------------- Macro: consoleLog -------------------->
<#-- This macro prints an entry to the browser JavaScript console (i.e. console.log) -->
<#macro consoleLog logEntry="">
  <@liaAddScript>
    ; (function ($) {
      console.log("${logEntry}");
    })(LITHIUM.jQuery);
  </@liaAddScript>
</#macro>


<#-------------------- Macro: consoleError -------------------->
<#-- This macro prints an error to the browser JavaScript console (i.e. console.error) -->
<#macro consoleError logEntry="">
  <@liaAddScript>
    ; (function ($) {
      console.error("${logEntry}");
    })(LITHIUM.jQuery);
  </@liaAddScript>
</#macro>
  

<#-------------------- Macro: consoleDebug -------------------->
<#-- This macro prints a debug message to the browser JavaScript console (i.e. console.debug) -->
<#macro consoleDebug logEntry="">
  <@liaAddScript>
    ; (function ($) {
      console.debug("${logEntry}");
    })(LITHIUM.jQuery);
  </@liaAddScript>
</#macro>


<#-------------------- Macro: consoleInfo -------------------->
<#-- This macro prints an info message to the browser JavaScript console (i.e. console.info) -->
<#macro consoleInfo logEntry="">
  <@liaAddScript>
    ; (function ($) {
      console.info("${logEntry}");
    })(LITHIUM.jQuery);
  </@liaAddScript>
</#macro>


<#-------------------- Macro: consoleWarn -------------------->
<#-- This macro prints a warning message to the browser JavaScript console (i.e. console.warn) -->
<#macro consoleWarn logEntry="">
  <@liaAddScript>
    ; (function ($) {
      console.warn("${logEntry}");
    })(LITHIUM.jQuery);
  </@liaAddScript>
</#macro>

Then in my other custom components/macros/functions I am able to easily generate log entries by importing the macro file and calling one of the macros above, as demonstrated below.

<#-- Import the macro file -->
<#import 'custom.macro.logging' as logging />

<#-- Attempt to get the user ID -->
<#attempt>
  <#assign userId = user.id />
  <@logging.consoleDebug "The User ID is ${userId}" />
<#recover>
  <@logging.consoleError "Encountered an exception while retrieving the User ID" />
</#attempt>

Then while testing in the browser you can monitor the Console tab in Developer Tools and have a better understanding of what might be failing and why.

(I like to include the text "Encountered an exception while..." in error messages within the <#recover> directive because it reminds me that I should check out the Toolbox to see what the verbose FreeMarker error was so I can troubleshoot even further.)

I hope this helps!

jeffshurtliff's avatar
jeffshurtliff
Boss
5 years ago

I realized I forgot to comment on the other part of your question about getting "the kind of a variable" which I assume you mean the data type of a variable, e.g. string, hash, sequence, etc.

FreeMarker has some quite a few built-ins to check the data type of a variable, which are explained in the official documentation.

However, to avoid having to call a whole bunch of built-ins whenever I want to know the data type of one of my variables, I created the function below which really comes in handy.

<#-------------------- Function: checkDataType -------------------->
<#-- This function returns the data type of the object -->
<#function checkDataType object simple=false>
  <#local dataType = "unknown" />
  <#attempt>
    <#if object?is_string>
      <#local dataType = "string" />
    <#elseif object?is_number>
      <#local dataType = "number" />
    <#elseif object?is_boolean>
      <#local dataType = "boolean" />
    <#elseif object?is_sequence>
      <#local dataType = "sequence" />
      <#if simple?? && !simple>
        <#attempt>
          <#local subType = checkDataType(object[0]) />
          <#if subType?? && subType != "unknown">
            <#local dataType = dataType + "+${subType}" />
          </#if>
        <#recover>
          <@logging.consoleError "Encountered an exception when attempting to determine data subtype for object" />
        </#attempt>
      </#if>
    <#elseif object?is_hash>
      <#if simple?? && !simple && object?is_hash_ex>
        <#local dataType = "extended_hash" />
      <#else>
        <#local dataType = "hash" />
      </#if>
    <#elseif object?is_date_like>
      <#local dataType = "date_like" />
    <#elseif object?is_method>
      <#local dataType = "method" />
    <#elseif object?is_macro>
      <#local dataType = "macro_function" />
      <#--  Correct syntax for checking marcos is checkDataType(macro) instead of checkDataType(<@macro></@macro>) -->
      <#--  Correct syntax for checking functions is checkDataType(myFunc) instead of checkDataType(myFunc()) -->
    </#if>
  <#recover>
    <@logging.consoleError "Encountered an exception when attempting to determine data type for object" />
  </#attempt>
  <#return dataType />
</#function>

This way I can use the function to quickly identify the data type and take action accordingly, such as in the example below.  (I keep the function in a macro file called custom.macro.common.utils.ftl which is why you see it referenced as such below.)

<#-- Import common utilities -->
<#import 'custom.macro.common.utils' as commonUtils />

<#assign someVar = 12345 />

<#-- Ensure the variable below is a string -->
<#assign dataType = commonUtils.checkDataType(someVar) />
<#if dataType == 'number' || dataType == 'boolean'>
  <#assign someVar = someVar?c />
</#if>

This is my variable: ${someVar}

Hope this helps!