iTop Extensions

Data collector Base

Data collector Base
Inventory Data Collector toolkit for creating your own data collectors for iTop
Client Store, Combodo Site, iTop Hub
PHP 8.1

This module provides the base for creating an industrial data collection and synchronization application for iTop. Developers can rely on this module to perform all the heavy lifting related to the iTop data import and synchronization process in order to focus on the data collection.


  • Simple API to make the creation of a new collector fast and easy.
  • Automatic creation and update of Synchronization Data Sources in iTop, based on JSON definitions.
  • Support small variations to the target Data Model via explicitely “Optional” attributes
  • Basic validation of the CSV format compared to the expected fields in the synchro data source.
  • Data upload and synchronization by chunks of max_chunk_size (configurable).
  • Extensible mechanism for handling configuration parameters.
  • Extensible list of placeholders in the JSON definition.
  • Automatic management (via placeholders) of the contact to notify and the user to use for running the synchro.
  • Validation of the minimum version of PHP and the needed extensions (as specified by the collector).
  • Command line tool to produce the JSON definition from an existing Synchro Data Source in iTop.
  • Capability to run independently: the configuration of the data sources, the data collection and the data synchronization.
  • Configurable log level (for console output or syslog logging)
  • Simple framework for quickly creating SQL based collectors

Revision History

If you use CSV collector 1.1.4, configuration parameters format has changed in 1.2.0, so you will need to change them
Release Date Version Comments
2023-03-15 1.3.0 * N°5710 - Enable writing an extensible collector
* N°5868 & 5950 - Add compatibility PHP 8.0 and PHP 8.1
* N°6012 - Support iTop authentication by token
* N°5707 - Contact to notify can also be a Team
* N°5139 - Add option to let data that is null also be null at the other side
* N°5902 - Empty or header-only CSV source file do not stop following collects anymore
* N°5995 & 5979 - Handles empty lookup table transparently
* N°5600, 5709 & 5884 - Improve support of optional fields (present or not in iTop datamodel)
* N°5738 - JSON collector mapping now supports index and * in field path
* N°4391 & 5749 - Improve logged info in LOG_DEBUG mode
* N°5995 - Empty lookup table no more generate PHP warning
2022-03-07 1.2.4 * N°4364 - Configurable eventissue object creation when collector errors
* N°4395 - Defaults values for datacollector base mode JSON
* Defaults values for datacollector base mode CSV used only when there is no value in the input file
* N°4710 - Handle empty json file in Fetch method
2020-12-21 1.2.3 * Fix compatibility with SSO set as default connection mode
2020-10-20 1.2.1 * Fix: Data synchro error message not handled (when reconciled on primary_key)
2020-10-01 1.2.0 * New JSON collector.
* CSV collector configuration: format change + new parameters defaults / field / ignored_columns / has_header
* Add testconnection.php script
2020-06-24 1.1.4 * The path to the configuration file can now be specified via the option --config_file on the command line.
* The location where to store the collected data is now a parameter in the configuration file: data_path.
* Better checking of Data Source definitions to catch missing reconciliation keys
* Option on the Lookuptable class to treat lookup errors as normal
2020-04-30 1.1.3 * New CSV collector
* Configurable timestamp added in the logs
* New option for usage: –help
2019-11-07 1.1.2 Fix “undefined constant TABLENAME_PATTERN”
2019-10-28 1.1.1 Contains upgrades from both 1.0.13 and 1.1.0
* Reject invalid characters for database_table_name
2019-10-28 1.1.0 Based on 1.0.9
* Added the specific class MySQLCollector which forces the DB connection to use UTF-8 characters
2019-10-28 1.0.13 * LookupTables can now be non case sensitive (since MySQL is not)
* Prevent a warning in SQLCollector for each “ignored” attribute
* Improved support of iTop 2.4+ (obsolescence flag)
2019-10-28 1.0.12 * removed a warning in PHP 7.2
2018-06-26 1.0.11 Added a debug trace (visible if console_log_level=9) to show which mapping regular expression is applied (when one is applied).
Bug fix: properly handle utf-8 characters in the mapping table's regular expressions (/u modifier)
Make the cUrl/SSL options configurable to suit all possible combinations and security considerations.
2015-06-30 1.0.10 New class of collector: MySQLCollector which forces the retrieved data to be encoded in UTF-8.
2015-06-09 1.0.9 Performance enhancement: retrieve only the needed fields when building a lookup table.
2015-06-02 1.0.8 Better checking of files access rights for writing. SQL connection string (for SQL collectors) is now fully configurable.
2015-05-20 1.0.7 Bug fixes: Support of backslashes in file names. Removed a warning by marking Utils::Substitute() static.
2015-05-13 1.0.6 Added the support of “ignoring” some rows in the data while re-processing them. SQL collector can be configured to safely ignore some fields.
2015-02-16 1.0.4 Added the configuration parameter stop_on_synchro_error.
2015-01-06 1.0.3 Handling of non UTF-8 data (via the overloading of GetCharset()), error checking for the data import phase, optimization for iTop 2.1.0: ignoring any change in the database_table_name field.
2014-11-03 1.0.2 Added the base class SQLCollector for easily creating SQL based collectors.
2014-10-11 1.0.1 Added the method AttributeIsOptional to handle variations in the target Data Model.
2014-05-13 1.0.0 First version


  • Data upload to iTop is done only via the syncho_import web service (could use the command line version or direct SQLcommands. TBD later, maybe)
  • Prior to the revision 3805 of iTop from SVN (from 2015-10-12!) the collector will NOT work properly if the account used to connect to iTop is not configured to use English as the language !!
  • Collector can only use the login_mode = “form”, it is not possible to use SSO authentication
  • Collectors are using synchro_import, but does not propagate yet date_format


  • PHP Version 5.3.0 (support of namespaces may be required by some collectors)
  • An access to the iTop web services (REST + synchro_import.php and synchro_exec.php)
  • We recommand to install php_curl to use the collector base parameter itop_synchro_timeout otherwise the timeout is hardcoded to 200 secondes and can't be overwritten by the collector.
Under 1000 synchronized objects, it should work without php_curl, above it won't!

Data Collector overview

How data collector works

Collectors are small ETL. Some parts can be customized by configuration, others by code.

  • Extract:
    • if using one of the bundled implementations (REST/JSON, SQL, CSV, …), you might only need to write some configuration
    • if you need a custom source, or to add some specific behavior, it can be coded in the collector class
  • 🔁 Transform: mapping can either be done by configuration (if using an existing implementation) or by code (data mapping and lookup functionnalities)
  • Load: as the collector uses the iTop DataSynchro, this phase will be customized only by configuration

Data collector structure

Directories of a collector:

  • core: SDK files
  • toolkit: some tools for collector developers
  • conf: configuration
  • data: csv files containing collected data
  • collectors: collectors files

collectors directory

The specifics about a collector resides inside the “collectors” folder. This directory should contain at least :

  • collectors classes: for example
  • datasynchro configuration: for example MyOwnCollector.json
  • main.php: file purpose is to register all the Collector classes for your module and load the corresponding classes (either via require_once(…) or by registering an auto-loader)

Should your collector rely on multiple collector classes, you may group the php file under ​collectors/​src/​ ​and the json files under ​collectors/​json/​​. Furthermore,​ files that extends an existing collector provided by Combodo may be stored under ​collectors/​extensions/​​. See the Writing an extensible Collector chapter.

Collectors examples

Combodo provides some already packaged collectors :

If no packaged collector is available for your data source, check those examples to implement quickly a base collector :

Creating a collector

Before starting

First question: How to get data from your source application. How can it be queried?

  1. Directly querying the database in SQL?
  2. Using REST and webservice, with returned data in JSON format?
  3. Directly using CSV files produced by the application?
  4. Using other sorts of webservices, such as for example ripcord?

For each of the first 3 methods, a predefined collector exist already within the SDK, so writing your own based on those is mainly a matter of writing configuration files. For the last case, there is more work to do in PHP.

Second question: On which server will you install your collector?

  • The collector is a standalone application, which need to be started by a cron on a regular basis.
  • The collector must have access to the data of your source application
  • The collector must have web access to your iTop webservices, but does not need to be on the same machine.
  • The collector must be host on a machine compatible with collector base requirements

For each Source of Data which is collected and mapped before synchronization with iTop, the configuration can specify:

  • How to collect: where to get/find the source data
  • How to map:
    • Which source field should be copied in which iTop field
    • How a field value should be transformed into an iTop understood value
    • What default data to put in a given iTop field if not present in the source
    • The mapped data are put in an intermediate CSV file.
  • How to synchronize
    • Should the iTop field value be reset or left untouched, if later found empty in the source?

The exact configuration possibilities of How to collect and How to map depends on the collectors (JSON, CSV, OQL, custom).


Do not install this extension in your webserver directories (like apache). otherwise your configuration files (with URLs, credentials) may be accessible from outside
  1. download collector base archive
  2. extract the archive files to the chosen collector machine
  3. copy conf/params.distrib.xml to conf/params.local.xml
  4. create your collector class in the /collectors directory
  5. create collectors/main.php
  6. create the corresponding datasynchro on the targeted iTop instance
  7. extract the datasynchro config
  8. update configuration (conf/params.local.xml)
  9. launch the collector



The file params.distrib.xml contains the default values for the parameters. Both files (params.distrib.xml and params.local.xml) use exactly the same format, but params.distrib.xml is considered as the reference and should remain unmodified.
Should you need to change the value of a parameter, copy and modify its definition in params.local.xml. The values in params.local.xml have precedence over the ones in params.distrib.xml

Minimal configuration

params.local.xml is at minimum, the file to edit to configure a collector.

And the following parameters must be set in this file:

Parameter Meaning Sample value
itop_login Login (user account) for connecting to iTop. Must have admin rights for executing the data synchro. admin
itop_password Password for the iTop account.
itop_url URL to the iTop Application https://localhost/itop

Optional parameters

The following parameters can be redefined to alter the default behavior of the collector:

Parameter Meaning Default value
max_chunk_size Maximum number of elements to process in one iteration (for upload and synchro in iTop). If there are more elements than this number, the process will automatically iterate. 1000
itop_synchro_timeout Timeout for waiting for the execution of one data synchro task (in seconds)- requires php_curl 600
stop_on_synchro_error Whether or not to stop when an error occurs during a synchronization (yes or no). no
console_log_level Level of ouput to the console. From -1 (none) to 9 (debug). 6 (info)
console_log_dateformat Logger timestamp format [Y-m-d H:i:s]
eventissue_log_level Level threshold to create event issues on remote iTop. From -1 (none) to 9 (debug). -1 (none juste like before)
curl_options When using cUrl to connect to the iTop Webservices the cUrl options can be specified in this section. The syntax is <CURLOPT_NAME_OF_THE_OPTION1>VALUE 1</CURLOPT_NAME_OF_THE_OPTION1> where VALUE_x are either:
The numeric value of the option,
or the string representation of the corresponding PHP “define” (case sensitive).
It is possible to define several php_curl options like in the example below
data_path New in 1.1.4 The path where to store the temporary files generated by the collector. You can use the special placeholder %APPROOT% to specify a path relative to the root folder of the collector. %APPROOT%/data
The following options might help if you're connecting using HTTPS:
Collectors are using synchro_import, but does not propagate yet date_format

Configuration for a SQL collector

The configuration parameters for the SQL Collectors are:

Parameter Meaning Default Value
sql_engine The PDO driver/engine to use for the database connection. mysql
sql_host The name or IP address of the database server to connect to. localhost
sql_database The name of the database to connect to. empty
sql_login The login to use when connecting to the database root
sql_password The password to use when connecting to the database n/a
sql_connection_string New in 1.0.8 The format of the PDO connection string. 3 placeholders are available inside the format string: %1$s = sql_engine, %2$s= sql_database and %3$s = sql_host %1$s:dbname=%2$s;host=%3$s
collector_class_query The query to run for the collector which PHP class is collector_class. For example : MyCollectorClass_query
collector_class_ignored_attributes New in 1.0.6 To take into account the possible variations of the data model, without re-writing a collector each time, it is possible to mark some of the collected attributes as “optional” so that the collector can run even if the corresponding attribute does not exist in the data model. Supply an array of attribute codes to ignore, here.
To specify a port number (or any other driver specific options), change the format of the sql_connection_string. For example: %1$s:dbname=%2$s;host=%3$s;port=3307

For versions prior to 1.0.8, to specify a port number (other than the default port), use the syntax host;port=xxxx for the sql_host parameter. Example: localhost;port=3307

Starting with version 1.0.10, the framework provides a new class of collector: MySQLCollector. This class is identical to SQLCollector except that it forces the retrieved data to be encoded in UTF-8 by issuing the SQL command SET NAMES 'utf8' at the beginning of the each connection to the database. To avoid any problem with the character set of the data, it is recommended to use this new class for all connections to a MySQL/MariaDB database.

Configuration for a JSON collector

Parameter Meaning
jsonfile Define relative or absolute path to the json file to parse for the collector which PHP class is collector collector_class. This parameter or jsonurl is mandatory
jsonurl The URL of json file to parse for the collector which PHP class is. This parameter or jsonpath is mandatory
jsonpost Xml of params to post with the url in order to get Json file <name_of_param>value</name_of_param>
command The CLI command to execute BEFORE parsing json file for the collector which PHP class is collector_class. This parameter is optional
path path in order to find data to synchronize in json separator is / and * replace any word by example aa/bb for {“aa”:{“bb”:{mydata},“cc”:“xxx”} and aa/ * /bb for {“aa”:{cc“:{“bb”:{mydata1}},”dd“:{“bb”:{mydata2}}}
fields xml which describes connection between name in json and name in itop <name_in_itop>name_in_json</name_in_json>
It can be a path as the path parameter, so include level /, * and index (number), when the structure has no key
defaults allow to specify itop fields for which we want to set fixed values. It can be used in combination with a mapping, for the case where a particular Blabla Site has no value for this field.

Configuration for a CSV collector

Inside your collector configuration section you can set below parameters:

Parameter Meaning Default Value
csv_file The csv file to be parsed by the collector. You can specify an URL, the full path of this file (/tmp/myfile.csv) or a relative path to the collector collector_class. This parameter is mandatory
command The CLI command to execute BEFORE reading/parsing csv file. This parameter is optional
encoding The csv file encoding. This parameter is optional UTF-8
separator The separator to use for the csv file to parse. This parameter is optional. Note: you can use the literal string TAB to specify that the separator is the ASCII character tab (0x09). ;
defaults for each synchro field you can specify a default value to be used during synchro step
fields This is a mapping section between data synchro fields and the one found in the CSV file.
ignored_columns This section describes which CSV fields you decide to ignore.
has_header Indicates whether there is CSV header that describes your column names or not. true

DataSynchro configuration

A collector is a PHP class that provides the data for a given iTop Synchronization Data Source. Collector classes are derived from the abstract Collector class. Each collector is associated with a Synchronization Data Source, defined in JSON format. The default implementation simply looks for a JSON file with the same name as the collector class and the extension “.json”, in the collectors folder.

The simpler way to create this definition file for a Synchro Data Source, is to export the definition of an existing data source.

  • Create the synchronisation data source in iTop, adjust its parameters (attributes mapping, deletion policy, full load interval, etc.) to suit your needs
  • Use the command line tool dump_tasks.php (available in the toolkit folder) to produce the JSON file:
php toolkit/dump_tasks.php --task_name="name of the task to export" > collectors/myCollector.json

This definition file is in JSON format.

If you specify a non-empty value for database_table_name, this name MUST BEGIN WITH <table-prefix>synchro_data. Where <table-prefix> is the prefix used for all tables in iTop (configured using the db_subname parameter in the iTop configuration file).
If you modify the list of fields of a class already collected, you must update your JSON definition file, to specify what to do with the new fields. By default they are added to existing Data Synchro with no update and no lock.

Inside your Synchro Data Source definition file you can use special placeholders to make the Data Source configurable by the user of the application, or to adjust its behavior via some special settings:

Placeholder code Meaning Sample value
$version$ The version of the module. Useful for versioning your application, for example in the “description” of the synchro data source. 1.0.0
$synchro_user$ The user to run the synchro, specified by its login in the configuration file. The identifier of the User object is available via this placeholder. cron-user
$contact_to_notify$ The contact to notify, specified by its email address in the configuration file. The identifier of the contact is supplied via this placeholder.
$full_load_interval$ The delay (expressed in seconds) between two complete imports of the data. The objects which have not been detected by the collector during a timespan longer than this interval will be considered as obsolete and marked as such in iTop. Adjust this value depending on the scheduling recurrence. 604800
$prefix$ The prefix for the name of all Synchronization Data Sources in iTop. Required to run several instances of the collector (to collect information from several vSphere servers). Prefix all datasynchro names with $prefix$ in each .json file vSphere1
On top of those special configuration parameters listed above, all parameters defined in the section 'json_placeholders' of the configuration file are also available as placeholders inside the JSON file. See the dedicated chapter on placeholders !

Registering collectors

All of the collector classes must be registered. To register your collector, add in collectors/main.php a call to the static method Orchestrator::AddCollector(). The two parameters are:

  • The order in which the collector should be run (when you need to run several collectors one after the other)
  • The name of the class (derived from Collector) in which the collector is implemented.

When writing an extensible collector (see below), this step can be skipped as the registration is handled by the collection plan itself

Testing the collector

Testing iTop REST API connection

You may encounter network/authentication issues to reach the iTop server you need to synchronize. To test that connection please use below command:

* connection OK: JSON answer is displayed in the ouput

php toolkit/testconnection.php 
    curl_init exists: 1
array(4) {
  'version' =>
  string(3) "1.0"
  'operations' =>
  array(7) {
    [0] =>
    array(3) {
      'verb' =>
      string(11) "core/create"
      'description' =>
      string(16) "Create an object"
      'extension' =>
      string(12) "CoreServices"

* network issue: HTTP error code displayed (among other logs)

php toolkit/testconnection.php 
UNIX system
    curl_init exists: 1
Problem opening URL: https://localhost/iTop/webservices/rest.php?version=1.0
    error msg: Failed to connect to localhost port 443: Connection refused
    curl_init error code: 7 (cf

* credential issue

php toolkit/testconnection.php 
UNIX system
array(2) {
  'code' =>
  'message' =>
  string(20) "Error: Invalid login"
Calling iTop Rest API worked!

* permission issue

php toolkit/testconnection.php 
UNIX system
    curl_init exists: 1
array(2) {
  'code' =>
  'message' =>
  string(136) "Error: This user is not authorized to use the web services. (The profile REST Services User is required to access the REST web services)"
Calling iTop Rest API worked!

Fix : Add the “REST Services User” profile to the user set in the conf/params.distrib.xml file.

Troubleshooting datasynchro issues

Set the console_log_level to 7 or more to get more information about the synchro_import. From level 7 and above, the collector executes synchro_import with output=details instead of output=redcode, and so will get more information about the synchronization errors and warnings on iTop side. Those details are then log on the collector side. With a console_log_level below 7, some warnings may never be recorded at all, even on iTop side, and your iTop objects can remain not-synchronized without explanation.

To learn more, see this dedicated page : Troubleshooting a Data Synchro


To launch the data collection and synchronization with iTop, run the following command (from the root directory where the application is installed):

php exec.php

The following (optional) command line options are available:

Option Meaning default value
--config_file Specify the full path to the configuration file. The file conf/params.local.xml is used by default if this parameter is omitted. empty
--console_log_level=<level> Level of ouput to the console. From -1 (none) to 9 (debug). 6 (info)
--eventissue_log_level=<level> Level threshold to create event issues. From -1 (none) to 9 (debug). 6 (info)
--collect_only Run only the data collection, but do not synchronize the data with iTop false
--synchro_only Synchronizes the data previously collected (stored in the data directory) with iTop. Do not run the collection. false
--configure_only Check (and update if necessary) the synchronization data sources in iTop and exit. Do NOT run the collection or the synchronization
--max_chunk_size=<size> Maximum number of items to process in one pass, for preserving the memory of the system. If there are more items to process, the application will iterate. 1000
--help Usage mode to display exec.php help.
Dates in source data must use this format YYYY-MM-DD (hh:mm:ss)

Advanced configuration

Reset or untouch

For How to synchronize, this is how you can specify fields that you don't want the DataSynchro to modify if they are empty on the source

  • In general, when the pushed value is an empty string, the iTop field will be reset to the iTop field default value. Check your iTop version wiki for exceptions.
  • Starting from iTop 3.0, when the pushed value in the csv, is exactly the <NULL> string, then synchro_import.php will put NULL in the replica table and the iTop field will remained untouched.

Since version 1.3.0 of collector base, it is possible to specify fields which if empty in the source, should be mapped to <NULL> so that the iTop field value is left unchanged.

        <nullified_attributes type="array">

Collectors with multiple sources : placeholders

Sample configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<!--  Local values for parameters. -->
<!--  The values defined in this file have precedence over the ones defined in params.distrib.xml -->
  <json_placeholders type="hash">
    <test>Test 1</test>

Sample Synchro Data Source definition file, notice the use of the $version$, $synchro_user$, $contact_to_notify$ and $test$ placeholders

Event issue creation

eventissue_log_level has been added to be able to track collector issues from iTop console directly. this could be useful to administrate iTop application or even monitor it.

Let's say parameter 'eventissue_log_level' is set to ERROR (3) level. collector execution will trigger an event issue object creation for each ERROR log printed with some detailed information. this is a way to centralize any collector feedback during any step of collector execution (configuration, collect, data synchronization).

Example of EventIssue created

Running several instances of the collector

In many circumstances it may be useful to run several times the collector with a different set of parameters. For example to collect persons information from several LDAP servers (iTop Data Collector for LDAP) or Virtual Machines information from several vSphere servers (iTop Data Collector for vSphere).

Prior to version 1.1.4 of the framework, you had to completely duplicate the collector application and adjust the file conf/params.local.xml on each copy.

Since version 1.1.4 you can have just one single copy the of the collector application and specify a different configuration file (with the command line option --config_file) for each collection to run (i.e. one configuration file per LDAP or vSphere server).

However, to avoid any troubles during the collection of the data and the synchronization with iTop, the following parameters must be properly configured inside the configuration file:

  • Use a different <prefix> inside each different configuration file. This ensures that a specific set of Synchronization Data Sources will be created for each configuration file.
  • Use a different <data_path> variable for each configuration file. This will cause the collector to store all its collected data (including some temporary files) in a dedicated directory. This prevents one instance of the collector to overwrite the data of another one. You can use the syntax <data_path>%APPROOT%/data/collector1</data> to have a subfolder collector1 created inside the data folder.

Custom collector class

Your collector must be a class derived from Collector. It must implement (at least) the Fetch() method. Fetch must return either, for each object to load, an array using the format attribute_code => value or false when the end of the set of objects has been reached.

The array returned by Fetch() must contain:

  • an entry primary_key that uniquely identifies the object being synchronized with iTop. The entry can contain whatever unique ID you can obtain from the inventory collection, or a unique identifier generated as a combination of the various fields of the object. It's up to the collector application to guarantee the unicity of this identifier (and its stability in time)
  • an entry for each attribute of the object to be loaded in iTop.

The sample code below generates a set of 10 servers, named 'Server 1', 'Server 2' … 'Server 10', and initialized 3 fields of the servers: their name, their organization (always 'Demo') and their description.

class MyCollector extends Collector
  protected $idx;
  public function Prepare()
        $bResult = parent::Prepare();
        $this->idx = 0;
        return $bResult;
  public function Fetch()
     if ($this->idx < 10)
        return array(
           'primary_key' => $this->idx, 
           'name' => 'Server '.$this->idx, 
           'org_id' => 'Demo', 
           'description' => 'Test Collector'
     return false;
// Register the collector, as the 1st to run
Orchestrator::AddCollector(1, 'MyCollector');
If the data returned by your collector are not encoded in the UTF-8 character set, overload the method GetCharset() of your collector to return the name of the character set (must return a value accepted by iconv on the iTop server)
If your collector had an Init() method, be sure to call its parent Init() method first, method which was added by version 1.3 of collector base

Data Mapping

Raw data collected by inventory scripts sometimes require a normalization before being imported into iTop, in order to obtain homogenous data. The framework provides the helper class MappingTable for performing simple normalizations tasks.

A mapping table is configured (in the configuration file) as an ordered list of patterns, with a value associated to each pattern. The “clean” value returned by the mapping table is the value associated with the first pattern that matches the input value. Patterns are expressed as regular expressions. Values can use the placeholders to refer to some part of the matched pattern (%1$s is the whole pattern, %2$s the first group inside the regular expression, etc.).

Example of configuration (Brand normalization):
  <brand_mapping type="array">
    <!-- Syntax /pattern/replacement where:
      any delimiter can be used (not only /) 
      but the delimiter cannot be present in the "replacement" string
      pattern is a RegExpr pattern
      replacement is a sprintf string in which:
          %1$s will be replaced by the whole matched text,
          %2$s will be replaced by the first matched group, if any group is defined in the RegExpr
          %3$s will be replaced by the second matched group, etc...

This example file performs the following normalization:

  1. Every string containing “IBM” is transformed into “IBM”,
  2. Every string containing “Hewlett”, followed by any character, followed by “Packard” is transformed into “Hewlett-Packard”,
  3. Every string containing “Dell” is transformed into “Dell”,
  4. All other strings are kept as is.

Using a mapping table in your code

  1. Create an instance of the MappingTable class, passing it the name of the XML tag in which to look for its configuration (inside the XML param file)
  2. Use the MapValue method to process each value as needed (the second parameter is the default value, when no match is found in the mapping table).

Usage example:
// Turns the raw brand string ('brand_id') into a normalized brand
// Use 'Other' for brands not found in the normalization table
class TestCollector extends SQLCollector
    protected $oBrandMapping;
    public function Prepare()
        $bRet = parent::Prepare();
        // Create the MappingTable once at the initialization of your collector
        $this->oBrandMapping = new MappingTable('brand_mapping');
        return $bRet;
    public function Fetch()
        $aData = parent::Fetch();
        if ($aData !== false)
            // Then process each collected brand
            $aData['brand_id'] = $this->oBrandMapping->MapValue($aData['brand_id'], 'Other');
        return $aData;

Advanced Lookups

The data synchronization mechanism embedded in iTop is not capable of performing reconciliations based on multiple fields (like searching for a Model based on both the Brand name and the Model name). The LookupTable class provides this reconciliation capability for any number of fields.

The class LookupTable builds a lookup table by retrieving the specified fields of a set of iTop objects, and storing the resulting identifier of the objects in iTop.

An instance of LookupTable is created by specifying an OQL query (the set of iTop objects to retrieve) and the fields of the objects that will be used for the mapping.

The list (and the order) of the fields specified during the creation of the LookupTable instance is the list of fields to be passed later on when performing a Lookup(…)

Once the LookupTable has been initialized, a call to the Lookup($aData, array(Field1, Field2, …), destField) method will replace in $aData the value of the column destField by identifier of the iTop object whose specified fields match the values passed in $aData as the columns Field1, Field2….

Since version 1.0.6, the Lookup method returns false if not corresponding lookup was found. In such a case the code can either supply a default value, of throw an exception IgnoredRowException to tell the collector to reject the whole line of collected data.
Since version 1.1.4, the constructor of LookupTable accepts one extra (optional) parameter: $bIgnoreMappingErrors (default to false). If this parameter is set to true, the LookupTable will consider that lookup errors are normal and will not report them as warnings (but still list them in debug mode). This can be useful when the Lookuptable is used for filtering the collected data against a catalog defined in iTop. In such a case, lookup errors are the expected behavior.


In iTop, the operating system version is represented as a version depending on an OS family object. We can have the following objects in iTop:

  • Windows, versions 7.0 and 8.1,
  • Debian version 12.0.0.

This will be stored in iTop as shown below:

Object class id name
OSFamily 1 Windows
OSFamily 2 Linux Debian
Object class id osfamily_id name
OSVersion 1 1 7.0.0
OSVersion 2 1 8.1.0
OSVersion 3 2 12.0.0

Now let's imagine that our collector script gives us the two informations: 'Windows' and '8.1.0'. We can store the 'Windows' text string in the 'osfamily_id' field of the data synchro table and configure the synchro data source to perform the reconciliation based on the 'name' (this will properly replace 'Windows' by 1).

But to retrieve the identifier of the version 8.1.0 of Windows (which is 2 in our example) we need both the OS Family ('Windows') and the version number ('8.1.0'). The Synchronization Data Source is not capable of doing this composite lookup, this where the LookupTable comes into play.

$oOSVersionLookup = new LookupTable('SELECT OSVersion', array('osfamily_id_friendlyname', 'name'));

This will build - in memory - the following table:

lookup_key id
Windows_7.0.0 1
Windows_8.1.0 2
Debian_12.0.0 3

So if we have in $aData the following values:

osfamily_id osversion_id
Windows 8.1.0


$oOSVersionLookup->Lookup($aData, array('osfamily_id', 'osversion_id'), 'osversion_id', 0);

Will place in the column 'osversion_id' the result of the lookup for the values $aData['osfamily_id'] and $aData['osversion_id'].

$aData will then contain the following values:

osfamily_id osversion_id
Windows 2

We then have to configure the Synchro Data Source so that it accepts the oversion_id as-is without performing any reconciliation on it.

The last parameter of Lookup(…) must contain the line number inside the CSV file being processed. This is used internally to perform some initializations only once when processing the first line of the file.

The advanced reconciliation works by retrieving (via the REST/JSON API), the objects to be matched against the composite key, after the data collection but before pushing the data to iTop. Therefore, in order to use this advanced lookup mechanism, you must tell the framework that the collector has to reprocess the collected data before the actual synchro. This is achieved by overloading the method MustProcessBeforeSynchro of the collector; and returning true.

The collector framework provides two additional methods which can be overloaded:

  1. InitProcessBeforeSynchro is called after the data collection, but before starting to reprocess each line of the collected data. This is the plece where to create the LookupTable instance
  2. ProcessLineBeforeSynchro is called for each line of the collected data (including the header line of the CSV file, which index is zero)

Usage Example

The following code fragment shows to use cases of lookup tables altogether: one for brand + model and one for OS family + OS version.
protected function MustProcessBeforeSynchro()
        // We must reprocess the CSV data obtained from the inventory script
        // to lookup the Brand/Model and OSFamily/OSVersion in iTop
        return true;
protected function InitProcessBeforeSynchro()
        // Retrieve the identifiers of the OSVersion since we must do a lookup based on two fields: Family + Version
        // which is not supported by the iTop Data Synchro... so let's do the job of an ETL
        $this->oOSVersionLookup = new LookupTable('SELECT OSVersion', array('osfamily_id_friendlyname', 'name'));          
        // Retrieve the identifiers of the Model since we must do a lookup based on two fields: Brand + Model
        // which is not supported by the iTop Data Synchro... so let's do the job of an ETL
        $this->oModelLookup = new LookupTable('SELECT Model', array('brand_id_friendlyname', 'name'));             
protected function ProcessLineBeforeSynchro(&$aLineData, $iLineIndex)
        // Process each line of the CSV
        if (!$this->oOSVersionLookup->Lookup($aLineData, array('osfamily_id', 'osversion_id'), 'osversion_id', $iLineIndex))
            throw New IgnoredRowException('Unknown OS Version');
        if (!$this->oModelLookup->Lookup($aLineData, array('brand_id', 'model_id'), 'model_id', $iLineIndex))
            throw New IgnoredRowException('Unknown Model');


When troubleshooting the reconciliation mechanism it is useful to compare the original (raw) values as reported by the inventory script with the result of the reconciliation process. Whenever the method MustProcessBeforeSynchro of a collector returns true, the framework generates two files inthe data subdirectory. You can easily compare the values before/after the lookup by comparing the two CSV files:

  1. <collector_name>.raw-<index>.csv: the original data, as produced by the inventory script,
  2. <collector_name>-<index>.csv: the reprocessed data, to be uploaded to iTop.

Distributing your collector

Default values for the parameters

A collector module can provide default values for its parameters by providing a file params.distrib.xml in the collectors folder. If such a file exists, its values are merged over the equivalent file in the conf directory.

Adaptation to multiple models

The collector can specify, per class, optional fields which may exist or not in the targeted iTop. For this the collector must implement the method AttributeIsOptional:

      public function AttributeIsOptional($sAttCode): bool
                if ($sAttCode == 'services_list') return true;
                return parent::AttributeIsOptional($sAttCode);

Data Model Variants

It may happen that the target Data Model has some variants (depending on the set of modules chosen during the installation). If a given attribute can be missing in some configurations, you can tell your collector to accept this variation, by overloading the method AttributeIsOptional. (This is simpler than writing a specific collector for each combination).

If an attribute specified in the JSON definition of the Synchro Data Source is missing, the processing will stop with an error, unless this attribute is declared as optional. In the later case, the name of the skipped attribute is recorded in the protected member variable $this->aSkippedAttributes and the processing continues. The code of the collector can later check the content of the array $this->aSkippedAttributes to determine which fields have to be collected or not.

Example of implementation of AttributeIsOptional as a method of the VirtualMachineCollector class:
// In your Collector class, overwrite this method to specify iTop fields which can be optional
public function AttributeIsOptional($sAttCode)
        // If the module Service Management for Service Providers is selected during the setup
        // there is no "services_list" attribute on VirtualMachines. Let's safely ignore it.
        if ($sAttCode == 'services_list') return true;
        return parent::AttributeIsOptional($sAttCode);

Writing an extensible Collector

Before version 1.3.0 of the collector, activation was controlled trough the main.php file only.

From version 1.3.0 onwards, the activation can be controlled by the collection plan (see below):

  • You can manually specify which collector to run and their order in XML within params.local.xml (or params.distrib.xml for a generic collector)
  • The collector itself can manage its dependencies and decide upon its activation or not.
It is not necessary to use a collection plan to activate collectors in versions above 1.3.0 and the legacy method is still available. But for sure, collection plans bring more flexibility and enlarge the possibilities of the data collector base.

Collector base

To benefit from this feature, your collector must be based on collector base 1.3.0 or more.

Collection Plan

A collection plan must be defined for your collector, which goal is to:

  • detect the specificities of the iTop target, like the presence of an optional extension,
  • retrieve from iTop information or objects that your collector depends on,
  • simplify the main.php where the different collector classes were orchestrated.

It implements the CollectionPlan class defined in the collector core, eg. with the LDAP collector:

abstract class LDAPCollectionPlan extends CollectionPlan
        public function __construct()
        public function Init(): void
                // Add your specificities here

The collection plan is instanciated through the main.php file, eg. for the LDAP collector:

// Initialize collection plan

Launch sequence

A Launch sequence must be defined in the params.distrib.xml file. It must list the classes that you wish to collect and their relative order.

<collectors_launch_sequence type="array">
      <!-- first_Class-->
      <!-- second_Class-->
      <!-- third_Class-->
Note that the collection of a class can be temporary suspended. This may be the case for structural classes that are stable and that don't need to be collected very often. This is done by setting the xml <enable> tag to no.

Next to the launch sequence, a class can check if all its requirements to run correctly are met or not and potentially decide not to run. This is done through the CheckToLaunch method.

class MyCollector extends Collector
   public function CheckToLaunch($aOrchestratedCollectors): bool
      if (conditions_are_met) {
         return true;
      } else {   
         return false;

Directory structure

The following structure must be implemented (paths are relative to <my-collector>/collectors/ directory):

  • all json files where the synchro data source are defined reside under /json
  • all PHP files for the different classes to collect are stored under /src
  • the /extensions directory will host add-ons created by customers,
  • all other files like main.php, params.distrib.xml or remain at the root.

Force PHP versions

If your collector needs a specific extension (or a minimum PHP version), you can specify this dependency by calling the static method Orchestrator::AddRequirement($sMinRequiredVersion, $sExtension = 'PHP') in main.php:

For example:

Orchestrator::AddRequirement('5.4.0'); //This requires at least PHP 5.4
Orchestrator::AddRequirement('1.2.0', 'ldap'); //This requires at least the ldap extension version 1.2.0

Workarounds on limitations


Assuming that

  1. you want to synchronize the iTop class MyClass
  2. this class contain one TagSet field with the code id tagset_code,
  3. the primary_key of the Source is stored in an iTop field primary_key_code

The below code, will store in $aTaxons for each primary_key, the source value for the TagSet field, then after the synchronization (so the creation/update of objects in iTop), will do an API REST call to update one by one, each object with its TagSet value.

It does not check if it is useful or not to update the iTop object, so it can be a probleme if you have high volumes of data and/or high datasynchro frequency

Just replace MyClass, tagset_code and primary_key_code with the correct values. Replace also Collecteur xxx by something meaningful, it will be stored in iTop history to describe who made that change.

class Mycollector extends XXXCollector
  protected $aTaxons;
  public function Fetch()
     $aObject = parent::Fetch();
     $this->aTaxons[$aObject['primary_key']] = $aObject['tagset_code'];
  public function Synchronize($iMaxChunkSize = 0)
    $iErrors = parent::Synchronize($iMaxChunkSize);
    $oClient = new RestClient();
    foreach($this->aTaxons as $primary_key => $sTaxon) {
      $aResult = $oClient->Update(
         array('primary_key_code' => $primary_key), 
         array('tagset_code' => $sTaxon), 
         'Collecteur xxx'
      if ($aResult['code'] == 0) {
        utils::Log(LOG_INFO, "TagSet successfully updated.");
      }   else {
           "TagSet update failed. Code: {$aResult['code']}, message: {$aResult['message']}");

If the 3rd assumption of the above example is not true, it is still possible to update, by retrieving the iTop object using the reconciliation criteria defined within the DataSynchro, but the code is more complex

class Mycollector extends XXXCollector
  protected $aTaxons;
  protected $aReconciliationKeys;
  protected function CheckDataSourceDefinition($aSourceDefinition)
    $this->aReconciliationKeys = [];
    if ($aExpectedSourceDefinition['reconciliation_policy'] == 'use_attributes') {
      foreach($aExpectedSourceDefinition['attribute_list'] as $aAttributeDef) {
        if ($aAttributeDef['reconcile'] == '1') {
           $this->aReconciliationKeys[] = $aAttributeDef['attcode'];
      if (count($this->aReconciliationKeys) == 0) {
        $this->aReconciliationKeys[] = 'id'; // iTop key provided for reconciliation
    return parent::CheckDataSourceDefinition($aSourceDefinition);
  public function Fetch()
     $aObject = parent::Fetch();
     $aTaxon = [];
     $aTaxon['fields'] = array('tagset_code' => $aObject['tagset_code']);
     foreach ($this->aReconciliationKeys as $sKeyCode) {
       if ($sKeyCode == 'id') {
          $aTaxon['conditions'] = $aObject['primary_key'];
       else {
           $aTaxon['conditions'][] = array( $sKeyCode => $aObject[$sKeyCode] );
     $this->aTaxons[] = $aTaxon; 
  public function Synchronize($iMaxChunkSize = 0)
    $iErrors = parent::Synchronize($iMaxChunkSize);
    $oClient = new RestClient();
    foreach($this->aTaxons as $aTaxon) {
      $aResult = $oClient->Update(
         'Collecteur xxx'
      if ($aResult['code'] == 0) {
        utils::Log(LOG_INFO, "TagSet successfully updated.");
      }   else {
            "TagSet update failed. Code: {$aResult['code']}, message: {$aResult['message']}");


FIXME: Work in progress, code is wrong for now

class Mycollector extends XXXCollector
  protected $aUpdatedFiles; // To store the files which must be updated because they have changed
  public function Fetch()
     $aObject = parent::Fetch();
     // If the file need to be updated
       // Get the file $aFile with name, contents and mimetype
       // Store the file locally
       $sFileName = '????'; //TODO provide the path to the file
       $this->aUpdatedFiles[$aObject['primary_key']] = array(
        'data' => base64_encode(file_get_contents($sFileName)),
        'filename' => basename($sFileName),
        'mimetype' => mime_content_type($sFileName), //Or fixed value e.g. .pdf => 'application/pdf'
  public function Synchronize($iMaxChunkSize = 0)
    $iErrors = parent::Synchronize($iMaxChunkSize);
    // After objects creation/update in iTop
    $oClient = new RestClient();
    foreach($this->aUpdatedFiles as $primary_key => $aFile) {
      $aResult = $oClient->Update(
         array('primary_key_code' => $primary_key), // Retrieve the iTop object
         array('file_code' => $aFile), 
         'Collecteur xxx'
      if ($aResult['code'] == 0) {
        utils::Log(LOG_INFO, "$aFile['filename'] successfully uploaded.");
      }   else {
           "REST/JSON upload failed for file $aFile['filename']. 
           Code: {$aResult['code']}, 
           message: {$aResult['message']}");
extensions/itop-data-collector-base.txt · Last modified: 2023/04/07 12:32 (external edit)
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