omc-commit Mailing List for OMC - Open Management with CIM (Page 29)

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Revision: 457
          http://svn.sourceforge.net/omc/?rev=457&view=rev
Author:   bartw
Date:     2007-05-11 17:26:15 -0700 (Fri, 11 May 2007)

Log Message:
-----------
Added ability to generate python provider stubs for CIM classes

Modified Paths:
--------------
    tools/trunk/yawn/yawn.py

Modified: tools/trunk/yawn/yawn.py
===================================================================

--- tools/trunk/yawn/yawn.py	2007-05-09 22:56:36 UTC (rev 456)
+++ tools/trunk/yawn/yawn.py	2007-05-12 00:26:15 UTC (rev 457)
@@ -1273,7 +1273,8 @@
     ht+= '<div align=center>View '+_makeHref(req, 'EnumInstanceNames', instUrlArgs, 'Instance Names')
     ht+= ' or '+_makeHref(req, 'EnumInstances', instUrlArgs, 'Instances')
     ht+= ' or '+_makeHref(req, 'AssociatedClasses', instUrlArgs, 'Associated Classes')
-    ht+= ' of this class.</div>'
+    ht+= ' of this class. &nbsp;'+_makeHref(req, 
+               'ProviderTemplate', instUrlArgs, 'Provider Template')+'</div>'
     ht+= '<table border="1" cellpadding="2">'
     if klass.qualifiers.has_key('aggregation'):
         titleBGColor = "green"
@@ -1657,6 +1658,7 @@
     return '</table></body></html>'
 
 ##############################################################################
+##############################################################################
 def AssociatedClasses(req, url, ns, className):
     conn = _frontMatter(req, url, ns)
     classNames = None
@@ -1903,6 +1905,314 @@
     return ht
 
 ##############################################################################
+##############################################################################
+##############################################################################
+def _providerTemplate (cc):
+    #################
+    def format_desc (obj):
+        txt = ''
+        try:
+            raw = obj.qualifiers['description'].value
+            beg = 0
+            end = 0
+            while beg < len(raw):
+                beg = end
+                end += 65
+                while beg < len(raw) and raw[beg] in string.whitespace:
+                    beg = beg+1
+                while end < len(raw) and end > beg \
+                   and raw[end] not in string.whitespace:
+                    end = end-1
+                line = raw[beg:end]
+                line = line.replace('\n',' ')
+                txt +='''
+            %s''' % line
+        except KeyError:
+            pass
+        return txt
+
+    #################
+    def type_str (obj):
+        tx = obj.type
+        if tx == 'reference':
+            tx = 'REF %s (CIMInstanceName)' % obj.reference_class
+        if obj.is_array:
+            tx += '[]'
+        return tx
+    #################
+    def is_required (obj):
+        try:
+            if obj.qualifiers['required'].value:
+                return '(Required)'
+            else:
+                return ''
+        except KeyError:
+            return ''
+    #################
+
+    mappings = {'classname':cc.classname,
+                }
+    isAssoc = 'association' in cc.qualifiers
+
+    code = '''"""Python Provider for %(classname)s
+
+Instruments the CIM class %(classname)s
+"""
+
+import pywbem
+
+class %(classname)sProvider:
+    """Instrument the CIM class %(classname)s 
+''' % mappings
+    code+= format_desc(cc)
+    code+= '''
+    """
+
+    #########################################################################
+    def __init__ (self):
+        pass
+
+    #########################################################################
+    def get_instance (self, env, model, cim_class):
+        """Return an instance of %(classname)s
+
+        Keyword arguments:
+        env -- Provider Environment
+        model -- A template of the CIMInstance to be returned.  The key 
+            properties are set on this instance to correspond to the 
+            instanceName that was requested.  The properties of the model
+            are already filtered according to the PropertyList from the 
+            request.
+        cim_class -- The CIMClass %(classname)s
+
+        """
+''' % mappings
+    keyProps = [p for p in cc.properties.values() \
+                if 'key' in p.qualifiers]
+    for prop in cc.properties.values():
+        if 'key' in prop.qualifiers:
+            continue
+        code+= '''
+        if '%(pname)s' in model.properties:
+            model['%(pname)s'] = # TODO (type = %(ptype)s) %(required)s''' \
+                % { 'pname': prop.name, 'ptype': type_str(prop),
+                    'required':is_required(prop) }
+
+    code+= '''
+        return model
+
+    #########################################################################
+    def enum_instances(self, env, model, cim_class, keys_only):
+        """ Enumerate instances of %(classname)s
+        The WBEM operations EnumerateInstances and EnumerateInstanceNames
+        are both mapped to this method. 
+        This method is a python generator
+
+        Keyword arguments:
+        env -- Provider Environment
+        model -- A template of the CIMInstances to be generated.  The 
+            properties of the model are already filtered according to the 
+            PropertyList from the request.
+        cim_class -- The CIMClass %(classname)s
+        keys_only -- A boolean.  True if only the key properties should be
+            set on the generated instances.
+
+        """
+
+        while False: # TODO more instances?
+            # TODO fetch system resource
+            # Key properties''' % mappings
+    for kp in keyProps:
+        code+='''    
+            model['%(pname)s'] = # TODO (type = %(ptype)s)''' \
+                % { 'pname':kp.name, 'ptype':type_str(kp) }
+    code+='''
+            if keys_only:
+                yield model
+            else:
+                try:
+                    yield self.get_instance(env, model, cim_class)
+                except pywbem.CIMError, (num, msg):
+                    if num in (pywbem.CIM_ERR_NOT_FOUND, 
+                        pywbem.CIM_ERR_ACCESS_DENIED):
+                        pass # EnumerateInstances shouldn't return these
+                    else:
+                        raise
+'''
+
+    code+='''
+    #########################################################################
+    def set_instance(self, env, instance, previous_instance, cim_class):
+        """ Return a newly created or modified instance of %(classname)s
+
+        Keyword arguments:
+        env -- Provider Environment
+        instance -- The new CIMInstance.  If modifying an existing instance,
+            the properties on this instance have been filtered by the 
+            PropertyList from the request.
+        previous_instance -- The previous instance if modifying an existing 
+            instance.  None if creating a new instance. 
+        cim_class -- The CIMClass %(classname)s
+
+        Return the new instance.  The keys must be set on the new instance. 
+
+        """
+
+        # TODO create or modify the instance
+        return instance
+
+    #########################################################################
+    def delete_instance(self, env, instance_name):
+        """ Delete an instance of %(classname)s
+
+        Keyword arguments:
+        env -- Provider Environment
+        instance_name -- A CIMInstanceName specifying the instance of 
+            %(classname)s to delete.
+
+        """ ''' % mappings
+                
+    for method in cc.methods.values():
+        inParms = [ p for p in method.parameters.values() if \
+                    'in' in p.qualifiers and p.qualifiers['in'].value ]
+        outParms = [ p for p in method.parameters.values() if \
+                    'out' in p.qualifiers and p.qualifiers['out'].value ]
+        code+= '''
+    #########################################################################
+    def cim_method_%s(self, env, object_name, method''' % method.name.lower()
+        for p in inParms:
+            code+= ''',
+                                  param_%s''' % p.name.lower()
+        code+= '''):
+        """Implements %s.%s()
+''' % (cc.classname, method.name)
+        code+= format_desc(method)
+
+        code+= '''
+        Keyword arguments:
+        env -- Provider Environment
+        object_name -- A CIMInstanceName or CIMCLassName specifying the 
+            object on which the method %(mname)s should be invoked
+        method -- A CIMMethod representing the method meta-data'''
+
+        for p in inParms:
+            code+= '''
+        param_%s --  The input parameter %s (type %s) %s''' \
+                    % (p.name.lower(), p.name, type_str(p), is_required(p))
+            code+= format_desc(p)
+
+        code+='''
+
+        Returns a two-tuple containing the return value (type %s)
+        and a dictionary with the out-parameters
+
+        Output parameters:''' %(method.return_type)
+
+        if not outParms:
+            code+= ' none'
+        else:
+            for p in outParms:
+                code+='''
+        %s -- (type %s) %s''' % (p.name, type_str(p), is_required(p))
+                code+= format_desc(p)
+
+
+        code+='''
+
+        """
+
+        # TODO do something
+        out_params = {}'''
+
+        for p in outParms:
+            code+='''
+        out_params['%s'] = # TODO (type %s)''' % (p.name.lower(), type_str(p))
+
+        code+='''
+        rval = # TODO (type %s)
+        return (rval, out_params)
+        ''' % method.return_type
+
+    if isAssoc:
+        code+= '''
+    #########################################################################
+    def references(self, env, object_name, model, assoc_class, 
+                   result_class_name, role, result_role):
+        """Instrument %(classname)s Associations.
+        All four association-related operations (Associators, AssociatorNames, 
+        References, ReferenceNames) are mapped to this method. 
+        This method is a python generator
+
+        Keyword arguments:
+        env -- Provider Environment
+        object_name -- A CIMInstanceName that defines the source CIM Object
+            whose associated Objects are to be returned.
+        model -- A template CIMInstance of %(classname)s to serve as a model
+            of the objects to be returned.  Only properties present on this
+            model need to be returned. 
+        assoc_class -- The CIMClass %(classname)s
+        result_class_name -- If not None, acts as a filter on the returned set 
+            of Objects by mandating that each returned Object MUST be either 
+            an Instance of this Class (or one of its subclasses) or be this 
+            Class (or one of its subclasses).
+        role -- If not None, acts as a filter on the returned set of Objects 
+            by mandating that each returned Object MUST be associated to the 
+            source Object via an Association in which the source Object plays 
+            the specified role (i.e. the name of the Property in the 
+            Association Class that refers to the source Object MUST match 
+            the value of this parameter).
+        result_role -- If not None, acts as a filter on the returned set of 
+            Objects by mandating that each returned Object MUST be associated 
+            to the source Object via an Association in which the returned 
+            Object plays the specified role (i.e. the name of the Property in 
+            the Association Class that refers to the returned Object MUST 
+            match the value of this parameter).
+        """
+
+''' % mappings
+
+    code+= '''
+
+## end of class %(classname)sProvider
+
+_prov = %(classname)sProvider()          # initialize provider
+py_providers = {'%(classname)s: _prov}   # register provider
+''' % mappings
+
+    ptypes = ['1', 'Instance']
+    if isAssoc:
+        ptypes[0]+= ',3'
+        ptypes[1]+= ', Associator'
+    if cc.methods:
+        ptypes[0]+= ',6'
+        ptypes[1]+= ', Method'
+    code+='''
+"""// Provider registration MOF for %(classname)s
+instance of OpenWBEM_PyProviderRegistration
+{
+        InstanceID = "<org:product:unique_id>"; // TODO
+        NamespaceNames = {"root/cimv2"}; 
+        ClassName = "%(classname)s"; 
+        ProviderTypes = {%(ptypeNums)s};  // %(ptypeStrs)s
+        ModulePath = "/some/path/%(classname)sProvider.py"; 
+}; 
+"""
+''' % {'classname': cc.classname, 
+       'ptypeNums': ptypes[0], 
+       'ptypeStrs': ptypes[1]}
+                
+    return code
+
+def ProviderTemplate(req, url, ns, className):
+    conn = _frontMatter(req, url, ns)
+    req.content_type = 'text/plain'
+    klass = _ex(req, conn.GetClass, ClassName = className, LocalOnly = "false", 
+                IncludeClassOrigin = "true")
+    return _providerTemplate(klass)
+
+
+##############################################################################
+##############################################################################
 # TODO
 """
 - Make GetClass links on REF type fields for properties and parameters.


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omc-commit Mailing List for OMC - Open Management with CIM (Page 29)

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