.. _kernel_config: ZOO-Kernel configuration ======================== Main configuration file ----------------------- ZOO-Kernel general settings are defined in a configuration file called ``main.cfg``. This file is stored in the same directory as ZOO-Kernel (``/usr/lib/cgi-bin/`` in most cases). It provides usefull metadata information on your ZOO-Kernel installation. .. warning:: ZOO-Kernel (``/usr/lib/cgi-bin/zoo_loader.cgi``) and its configuration file (``/usr/lib/cgi-bin/main.cfg``) must be in the same directory. .. note:: Information contained by ``/usr/lib/cgi-bin/main.cfg`` is accessible from WPS Services at runtime, so when *Execute* requests are used. Default main.cfg ............................... An example *main.cfg* file is given here as reference. .. code-block:: guess :linenos: [headers] X-Powered-By=ZOO@ZOO-Project [main] version=1.0.0 encoding=utf-8 dataPath=/var/data tmpPath=/var/www/temp cacheDir=/var/www/cache sessPath=/tmp serverAddress=http://localhost/cgi-bin/zoo_loader.cgi lang=fr-FR,ja-JP language=en-US mapserverAddress=http://localhost/cgi-bin/mapserv.cgi msOgcVersion=1.0.0 tmpUrl=http:/localhost/temp/ cors=false [identification] keywords=t,ZOO-Project, ZOO-Kernel,WPS,GIS title=ZOO-Project demo instance abstract= This is ZOO-Project, the Open WPS platform. accessConstraints=none fees=None [provider] positionName=Developer providerName=GeoLabs SARL addressAdministrativeArea=False addressDeliveryPoint=1280, avenue des Platanes addressCountry=fr phoneVoice=+33467430995 addressPostalCode=34970 role=Dev providerSite=http://geolabs.fr phoneFacsimile=False addressElectronicMailAddress=gerald@geolabs.fr addressCity=Lattes individualName=Gerald FENOY Main section ............................... The main.cfg ``[main]`` section parameters are explained bellow. * ``version``: Supported WPS version. * ``encoding``: Default encoding of WPS Responses. * ``dataPath``: Path to the directory where data files are stored (used to store mapfiles and data when MapServer support is activated). * ``tmpPath``: Path to the directory where temporary files are stored (such as *ExecuteResponse* when *storeExecuteResponse* is set to true). * ``tmpUrl``: URL to access the temporary files directory (cf. ``tmpPath``). * ``cacheDir``: Path to the directory where cached request files [#f1]_ are stored (optional). * ``serverAddress``: URL to the ZOO-Kernel instance. * ``mapservAddress``: URL to the MapServer instance (optional). * ``msOgcVersion``: Version of all supported OGC Web Services output [#f2]_ (optional). * ``lang``: Supported natural languages separated by a coma (the first is the default one), * ``cors``: Define if the ZOO-Kernel should support `Cross-Origin Resource Sharing `__. If this parameter is not defined, then the ZOO-Kernel won't support CORS. * ``servicePath``: Define a specific location to search for services rather than using the ZOO-Kernel directory. If this parameter is not defined, then the ZOO-Kernel will search for services using its directory. * ``libPath``: (Optional) Path to a directory where the ZOO-kernel should search for service providers, e.g., shared libraries with service implementations (the ``serviceProvider`` parameter in the service configuration (.zcfg) file). .. warning:: The ``libPath`` parameter is currently only recognized by services implemented in C/C++ or PHP, and may be moved to another section in future versions. In case you have activated the MapServer support, please refer to :ref:`this specific section `. Identification and Provider .......................................... The ``[identification]`` and ``[provider]`` sections are not ZOO-Project specific. They provide OGC metadata [#f3]_ and should be set according to the `XML Schema Document `__ which encodes the parts of ISO 19115 used by the common *ServiceIdentification* and *ServiceProvider* sections of the *GetCapabilities* operation response, known as the service metadata XML document. Details of the common OWS 1.1.0 *ServiceIdentification* section can be found in this `XML Schema Document `__. Details of the common OWS 1.1.0 *ServiceProvider* section can be found in this `XML Schema Document `__. Additional sections -------------------------------- Headers section ............................... The ``[headers]`` section can be set in order to define a specific HTTP Response header, which will be used for every response. As an example, you can check http://zoo-project.org using *curl* command line tool and notice the specific header *X-Powered-By: Zoo-Project@Trac*. In case you want to allow CORS support for POST requests coming from ``myhost.net``, then you should define the following minimal parameters in this section: .. code-block:: guess :linenos: Access-Control-Allow-Origin=myhost.net Access-Control-Allow-Methods=POST Access-Control-Allow-Headers=content-type env section ............................... The ``[env]`` section can be used to store specific environment variables to be set prior the loading of *Services Provider* and Service execution. A typical example is when a Service requires the access to a X server running on *framebuffer*, which takes to set the DISPLAY environnement variable, as follow: .. code-block:: guess :linenos: [env] DISPLAY=:1 In case you have activated the OTB support, please refer to :ref:`this specific section `. lenv section ............................... The ``lenv`` section is used by the ZOO-Kernel to store runtime informations before the execution of a WPS service, it contains the following parameters: * ``sid`` (r): The WPS Service unique identifier, * ``status`` (rw): The current progress value ( a value between 0 and 100 in percent (**%**) ), * ``cwd`` (r): The current working directory of ZOO-Kernel, * ``message`` (rw): An error message used when ``SERVICE_FAILED`` is returned (optional), * ``cookie`` (rw): The cookie to be returned to the client (for example for authentication purpose). * ``file.pid`` (r): The file used by the ZOO-Kernel to store process identifier. * ``file.sid`` (r): The file used by the ZOO-Kernel to store service identifier. * ``file.responseInit`` (r): The file used by the ZOO-Kernel to store the initial (then final) WPS response. * ``file.responseFinal`` (r): The file used by the ZOO-Kernel to temporary store the final WPS response. renv section ............................... The ``renv`` section is automatically created by the ZOO-Kernel before the execution of a WPS service, it contains all the environment variables available at runtime (so including the header fields in case it is used through http, refer to [https://tools.ietf.org/html/rfc3875 rfc3875] for more details). senv section ............................... The ``senv`` section can be used to store sessions information on the server side. Such information can then be accessed automatically from the Service if the server is requested using a valid cookie (as defined in ``lenv`` section). ZOO-Kernel will store the values set in the ``senv`` maps on disk, load it and dynamically replace its content to the one in the ``main.cfg``. The ``senv`` section must contain the following parameter at least: * ``XXX``: The session unique identifier where ``XXX`` is the name included in the cookie which is returned. .. _cookie_example: For instance, adding the following in the Service source code : .. code:: python conf["lenv"]["cookie"]="XXX=XXX1000000; path=/" conf["senv"]={"XXX": "XXX1000000","login": "demoUser"} means that ZOO-Kernel will create a file named ``sess_XXX1000000.cfg`` in the ``cacheDir`` directory, and will return the specified cookie to the client. Each time the client will request ZOO-Kernel using this cookie, it will automatically load the value stored before the Service execution. .. _zoo_activate_db_backend: Database section ............................... The database section allows to configure the :ref:`ZOO-Kernel optional database support `. .. code-block:: guess [database] dbname=zoo_project port=5432 user=username host=127.0.0.1 type=PG schema=public This will generate strings to be passed to GDAL to connect the database server: .. code-block:: guess :host= port= user= dbname= With the previous database section, it will give the following: .. code-block:: guess PG:"dbname=zoo_project host=127.0.0.1 port=5432 user=username" Please refer to this `section `_ to learn how to setup the database. Include section ............................... The ``[include]`` section (optional) lists explicitely a set of service configuration files the the ZOO-Kernel should parse, e.g., .. code-block:: guess :linenos: [include] servicename1 = /my/service/repository/service1.zcfg servicename2 = /my/service/repository/service2.zcfg The ``[include]`` section may be used to control which services are exposed to particular user groups. While service configuration files (.zcfg) may be located in a common repository or in arbitrary folders, main.cfg files at different URLs may include different subsets of services. When the ZOO-Kernel handles a request, it will first check if there is an ``[include]`` section in main.cfg and then search for other .zcfg files in the current working directory (CWD) and subdirectories. If an included service happens to be located in a CWD (sub)directory, it will be published by its name in the ``[include]`` section. For example, the service ``/[CWD]/name/space/myService.zcfg`` would normally be published as name.space.myService, but if it is listed in the ``[include]`` section it will be published simply as myService: .. code-block:: guess :linenos: [include] myService = /[CWD]/name/space/myService.zcfg On the other hand, with .. code-block:: guess :linenos: [include] myService = /some/other/dir/myService.zcfg there would be two distinct services published as myService and name.space.myService, respectively, with two different zcfg files. .. note:: As currently implemented, the ZOO-Kernel searches the CWD for the library files of included services if the ``libPath`` parameter is not set. .. rubric:: Footnotes .. [#f1] If GET requests are passed through ``xlink:href`` to the ZOO-Kernel , the latter will execute the request the first time and store the result on disk. The next time the same request is executed, the cached file will be used and this will make your process run much faster. If ``cachedir`` was not specified in the ``main.cfg`` then the ``tmpPath`` value will be used. .. [#f2] Usefull when the :ref:`kernel-mapserver` is activated (available since ZOO-Project version 1.3.0). .. [#f3] ZOO-Kernel and MapServer are sharing the same metadata for OGC Web Services if the :ref:`kernel-mapserver` is activated.