source: trunk/docs/services/howtos.txt @ 544

.. _services-howtos:

How To Setup ZOO Services
=========================

:Authors: Nicolas Bozon, Gérald Fenoy, Jeff McKenna, Luca Delucchi
:Last Updated: $Date: 2014-11-05 12:00:33 +0000 (Wed, 05 Nov 2014) $

ZOO Services are quite easy to create once you have installed the ZOO Kernel and have 
chosen code (in the language of your choice) to turn into a ZOO service. Here are some 
HelloWorlds in Python, PHP, Java  and JavaScript with links to their corresponding 
``.zcfg`` files.

.. contents:: Table of Contents
    :depth: 3
    :backlinks: top

Common informations
----------------------

The function of the process for each programming language take three arguments: the main
configuration, inputs and outputs.

.. Note:: The service has to **return 3 if the process run successfully instead it 
          return 4** if the process end with an error.

Python
------

You'll find here information needed to deploy your own Python Services Provider.

Python ZCFG requirements
************************

.. Note:: For each Service provided by your ZOO Python Services Provider, the ZCFG File 
          must be named the same as the Python module function name (also the case of
          characters is important).

The ZCFG file should contain the following :


serviceType
    Python 
serviceProvider
    The name of the Python module to use as a ZOO Service Provider. For instance, if your
    script, located in the same directory as your ZOO Kernel, was named ``my_module.py`` then
    you should use ``my_module`` (the Python module name) for the serviceProvider value in ZCFG file.

Python Data Structure used
**************************
The three parameters of the function are passed to the Python module as dictionaries.

Following you'll find an example for each parameters

Main configuration
^^^^^^^^^^^^^^^^^^^^^
Main configuration contains several informations, some of them are really useful to develop your service.
Following an example ::

  {
  'main': {'lang': 'en-UK',
           'language': 'en-US',
           'encoding': 'utf-8',
           'dataPath': '/var/www/tmp',
           'tmpPath': '/var/www/tmp',
           'version': '1.0.0',
           'mapserverAddress': 'http://localhost/cgi-bin/mapserv',
           'isSoap': 'false',
           'tmpUrl': 'http://localhost/tmp/',
           'serverAddress': 'http://localhost/zoo'
          },
  'identification': {'keywords': 'WPS,GIS',
                     'abstract': 'WPS services for testing ZOO',
                     'fees': 'None',
                     'accessConstraints': 'none',
                     'title': 'testing services'
                    },
  'lenv': {'status': '0',
           'soap': 'false',
           'cwd': '/usr/lib/cgi-bin',
           'sid': '24709'
          },
  'env': {'DISPLAY': 'localhost:0'},
  'provider': {'addressCountry': 'it',
               'positionName': 'Developer',
               'providerName': 'Name of provider',
               'addressAdministrativeArea': 'False',
               'phoneVoice': 'False',
               'addressCity': 'City',
               'providerSite': 'http://www.your.site',
               'addressPostalCode': '38122',
               'role': 'Developer',
               'addressDeliveryPoint': 'False',
               'phoneFacsimile': 'False', 
               'addressElectronicMailAddress': 'your@email.com',
               'individualName': 'Your Name'
              }
  }

Inputs
^^^^^^^^^^^^
The inputs are somethings like this ::

  {
  'variable_name': {'minOccurs': '1',
                    'DataType': 'string',
                    'value': 'this_is_the_value',
                    'maxOccurs': '1',
                    'inRequest': 'true'
                   }
  }

The access to the value you have to require for the ``value`` parameter, something like this ::

  yourVariable = inputs['variable_name']['value']

Outputs
^^^^^^^^^^^^^
The outputs data as a structure really similar to the inputs one ::

  {
  'result': {'DataType': 'string',
             'inRequest': 'true',
            }
  }

There is no ``'value'`` parameter before you assign it ::

  inputs['result']['value'] = yourOutputDataVariable

The return statement has to be an integer: corresponding to the service status code.

To add a message for the wrong result you can add the massage to ``conf["lenv"]["message"]``,
for example:

.. code-block:: python

  conf["lenv"]["message"] = 'Your module return an error'

Sample ZOO Python Services Provider
***********************************

The following code represents a simple ZOO Python Services Provider which provides only one 
Service, the HelloPy one.

.. code-block:: python

  import sys
  def HelloPy(conf,inputs,outputs):
     outputs["Result"]["value"]="Hello "+inputs["a"]["value"]+" from Python World !"
     return 3

PHP
---

.. code-block:: php

  <?
  function HelloPHP(&$main_conf,&$inputs,&$outputs){
     $outputs["Result"]["value"]="Hello ".$inputs[S][value]." from PHP world !";
     return 3;
  }
  ?>

Java
----

ZOO-API
*******

Before you build your first ZOO-Service implemented inn Java, it is
recommended that you first build the ZOO class of the Java ZOO-API.

.. Note:: You should build ZOO-Kernel prior to follow this instructions.

To build the ZOO.class of the ZOO-API for Java, use the following
command:

.. code-block:: guess

  cd zoo-api/java
  make
  cp ZOO.class libZOO.so /usr/lib/cgi-bin

.. Note:: running the previous commands will require that both
          ``javac`` and ``javah`` are in your PATH.

Java ZCFG requirements
**********************************

.. Note:: For each Service provided by your ZOO Java Services Provider
          (your corresponding Java class), the ZCFG File must be
          named the same as the Java public method name (also the
          case of characters is important).

The ZCFG file should contain the following :

serviceType
    Java 
serviceProvider
    The name of the Java class to use as a ZOO Service Provider. For instance, if your
    java class, located in the same directory as your ZOO-Kernel, was
    named ``HelloWorld.class`` then you should use ``HelloWorld``.


Java Data Structure used
********************************

The three parameters of the function are passed to the Java function
as `java.util.HashMap <http://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html>`__.

Sample ZOO Java Services Provider
******************************************

.. code-block:: java

  import java.util.*;
  public class HelloJava {
    public static int HelloWorldJava(HashMap conf,HashMap inputs, HashMap outputs) {
       HashMap hm1 = new HashMap();
       hm1.put("dataType","string");
       HashMap tmp=(HashMap)(inputs.get("S"));
       java.lang.String v=tmp.get("value").toString();
       hm1.put("value","Hello "+v+" from JAVA WOrld !");
       outputs.put("Result",hm1);
       System.err.println("Hello from JAVA WOrld !");
       return ZOO.SERVICE_SUCCEEDED;
    }
  }

Javascript
----------

ZOO API
*********

If you need to use :ref:`ZOO API <api>` in your service, you have first to copy ``zoo-api.js``
and ``zoo-proj4js.js`` where your services are located (for example in Unix system probably in
``/usr/lib/cgi-bin/``

Javascript ZCFG requirements
**********************************

.. Note:: For each Service provided by your ZOO Javascript Services Provider, the ZCFG File 
          must be named the same as the Javascript function name (also the case of
          characters is important).

The ZCFG file should contain the following :

serviceType
    JS 
serviceProvider
    The name of the JavaScript file to use as a ZOO Service Provider. For instance, if your
    script, located in the same directory as your ZOO Kernel, was named ``my_module.js`` then
    you should use ``my_module.js``.


Javascript Data Structure used
********************************

The three parameters of the function are passed to the JavaScript function as Object.

Sample ZOO Javascript Services Provider
******************************************

.. code-block:: javascript

  function hellojs(conf,inputs,outputs){
     outputs=new Array();
     outputs={};
     outputs["result"]["value"]="Hello "+inputs["S"]["value"]+" from JS World !";
     return Array(3,outputs);
  }