Writing a Custom QueryAuditHistory Service
Due to the nature of data returned by the QueryDataTableEntries service, it may not always suit the needs of the average user. To get the same information as in the QueryAuditHistory and QueryAuditHistoryWithQueryCriteria services of the Audit Subsystem, developers can write a wrapper service. This service needs to perform the following basic tasks:
• Query for data from the AuditDataTable
• Apply translation of the Localization Tokens (message and category fields)
• Apply variable substitution for message argument replacements (message field)
• Remove DataTable entry information
The following is an example of a custom QueryAuditHistory service. This service is written in simple JavaScript and is usable on any appropriate ThingWorx entity.
// Query auditing data with provided parameters
var result = Things["AuditDataTable"].QueryDataTableEntries({
maxItems: maxItems /* NUMBER */,
values: undefined /* INFOTABLE */,
query: query /* QUERY */,
source: source /* STRING */,
tags: undefined /* TAGS */
});
// Applying translation
var categoryCache = {};
var messageCache = {};
var size = result.getRowCount();
for (var i = 0; i < size; i++) {
var row = result.getRow(i);
row.message = applyReplacements(getTranslatedToken(row.message, locale, messageCache), row.messageArgs);
row.auditCategory = getTranslatedToken(row.auditCategory, locale, categoryCache);
}
// Removing non AuditHistory columns
result.RemoveField("id");
result.RemoveField("key");
result.RemoveField("tags");
result.RemoveField("location");
result.RemoveField("messageArgs");
// Helper translation and caching function
function getTranslatedToken(token, language, cache) {
if (cache[token] == null || cache[token] == undefined) {
var params = {
language: language /* STRING */,
token: token /* STRING */
};
var translation = Resources["RuntimeLocalizationFunctions"].GetEffectiveTokenForLanguage(params);
cache[token] = translation;
return translation;
} else {
return cache[token];
}
}
// Helper variable replacement function
function applyReplacements(translation, replacementsInfoTable) {
var filledInTranslation = translation;
var replacements = replacementsInfoTable.getRow(0);
for (var key in replacements) {
if (replacements[key] != null && replacements[key] != undefined) {
filledInTranslation = filledInTranslation.replace(new RegExp("__" + key + "__", "g"), replacements[key]);
}
}
return filledInTranslation;
}