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# Source code for fnss.netconfig.nodeconfig

    """Provides functions to deploy and configure protocol stacks and applications
    on network nodes
    """

    __all__ = [
        'add_stack',
        'get_stack',
        'remove_stack',
        'clear_stacks',
        'add_application',
        'get_application_names',
        'get_application_properties',
        'remove_application',
        'clear_applications',
               ]

    def add_stack(topology, node, name, properties=None, **kwargs):
        """Set stack on a node.

        If the node already has a stack, it is overwritten

        Parameters
        ----------
        topology : Topology
            The topology
        node : any hashable type
            The ID of the node
        name : str
            The name of the stack
        properties : dict, optional
            The properties of the stack
        **attr : keyworded attributes
            Further properties of the application
        """
        if properties is None:
            properties = {}
        elif not isinstance(properties, dict):
            raise TypeError('The properties parameter must be a dictionary')
        properties.update(kwargs)
        topology.node[node]['stack'] = name, properties

    def get_stack(topology, node, data=True):
        """Return the stack of a node, if any

        Parameters
        ----------
        topology : Topology
            The topology
        node : any hashable type
            The ID of the node
        data : bool, optional
            If true, returns a tuple of the stack name and its attributes,
            otherwise just the stack name

        Returns
        -------
        stack : tuple (name, properties) or name only
            If data = True, a tuple of two values, where the first value is the
            name of the stack and the second value is the dictionary of its
            properties.
            If data = False returns only the stack name
            If no stack is deployed, return None
        """
        if 'stack' not in topology.node[node]:
            return None
        name, props = topology.node[node]['stack']
        return (name, props) if data else name

    def remove_stack(topology, node):
        """Remove stack from a node

        Parameters
        ----------
        topology : Topology
            The topology
        node : any hashable type
            The ID of the node
        """
        if 'stack' in topology.node[node]:
            del topology.node[node]['stack']

    def clear_stacks(topology):
        """Remove all stacks from all nodes of the topology

        Parameters
        ----------
        topology : Topology
        """
        for v in topology.nodes_iter():
            if 'stack' in topology.node[v]:
                del topology.node[v]['stack']

    def add_application(topology, node, name, properties=None, **attr):
        """Add an application to a node

        Parameters
        ----------
        topology : Topology
            The topology
        node : any hashable type
            The ID of the node
        name : str
            The name of the application
        attr_dict : dict, optional
            Attributes of the application
        **attr : keyworded attributes
            Attributes of the application
        """
        if properties is None:
            properties = {}
        elif not isinstance(properties, dict):
            raise TypeError('The attr_dict parameter must be a dictionary')
        properties.update(attr)
        if 'application' not in topology.node[node]:
            topology.node[node]['application'] = {}
        topology.node[node]['application'][name] = properties

    def get_application_names(topology, node):
        """Return a list of names of applications deployed on a node

        Parameters
        ----------
        topology : Topology
            The topology
        node : any hashable type
            The ID of the node

        Returns
        -------
        application_names : list
            A list of application names
        """
        return [] if 'application' not in topology.node[node] \
                    else list(topology.node[node]['application'].keys())

    def get_application_properties(topology, node, name):
        """Return a dictionary containing all the properties of an application
        deployed on a node

        Parameters
        ----------
        topology : Topology
            The topology
        node : any hashable type
            The ID of the node
        name : str
            The name of the application

        Returns
        -------
        applications : dict
            A dictionary containing the properties of the application
        """
        if 'application' not in topology.node[node]:
            raise ValueError('There is no such application deployed on the node')
        return topology.node[node]['application'][name]

    def remove_application(topology, node, name=None):
        """Remove an application from a node

        Parameters
        ----------
        topology : Topology
            The topology object
        node : any hashable type
            The ID of the node from which the application is to be removed
        name : optional
            The name of the application to remove. If not given, all the
            applications of the node are removed
        """
        if 'application' in topology.node[node]:
            if name is None:
                del topology.node[node]['application']
            elif name in topology.node[node]['application']:
                del topology.node[node]['application'][name]

    def clear_applications(topology):
        """Remove all applications from all nodes of the topology

        Parameters
        ----------
        topology : Topology
            The topology
        """
        for v in topology.nodes_iter():
            if 'application' in topology.node[v]:
                del topology.node[v]['application']

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