# Baris Metin <tmetin@sophia.inria.fr>

import os
import xmlrpclib

from PLC.Slices import Slices
from PLC.SliceTags import SliceTags
from PLC.Nodes import Nodes
from PLC.Config import Config
from pyaspects.meta import MetaAspect


class BaseOMF(object):

    def __init__(self):
        self.config = Config("/etc/planetlab/plc_config")
        # this was only for debugging, no need to log all method calls here -baris
        # self.log = open("/var/log/omf/plc_slice_calls.log", "a")
        self.log = None
        

    def logit(self, call, args, kwargs, data, slice):
        if not self.log: return

        self.log.write("%s : args: %s  kwargs: %s\n" % (call, args, kwargs))
        self.log.write("data: %s\n" % data)
        self.log.write("%s\n\n" % slice)
        self.log.flush()

           
    def get_slice(self, api, id_or_name):
        slice_filter = {}
        try: # if integer
            slice_filter['slice_id'] = int(str(id_or_name))
        except ValueError:
            # we have a string
            slice_filter['name'] = id_or_name
        slice = Slices(api, slice_filter = slice_filter)[0]
# don't bother to check for slice tags for the moment. we'll only
# create XMPP pubsub groups for all slices
#
#         slice_tags = SliceTags(api, slice_tag_filter = { 'slice_id': slice['slice_id'] })
#         omf_tag = [tag for tag in slice_tags if tag['name'] == 'omf']
#         if omf_tag and omf_tag['value'] not in ('false','0','no'):
#             # OK, slice has the "omf" tag set.
#             return slice
#         return None
        return slice

    def get_node_hostname(self, api, node_id_or_hostname):
        node_filter = {}
        try:
            node_filter['node_id'] = int(str(node_id_or_hostname))
        except ValueError:
            # we have a hostname
            node_filter['hostname'] = node_id_or_hostname

        try:
            node = Nodes(api, node_filter = node_filter)[0]
            return node['hostname']
        except IndexError:
            return None
        
    def get_slice_tags(self, api, slice_id):
        return SliceTags(api, slice_tag_filter = {'slice_id': slice_id})

    def create_slice(self, slice):
        pass

    def add_resource(self, slice, resource):
        pass

    def delete_slice(self, slice):
        pass

    def delete_resource(self, slice, resource):
        pass

    # aspect method
    def before(self, wobj, data, *args, **kwargs):
        api_method_name = wobj.name
        slice_name_or_id = None
        node_ids = None

        # DeleteSlice shall be handled before the actual method call;
        # after the call we won't be able to acess the slice.
        if api_method_name == "DeleteSlice":
            slice_name_or_id = args[1]        
        else: # ignore the rest
            return

        slice = self.get_slice(wobj.api, slice_name_or_id)
        if not slice:
            return

        if api_method_name == "DeleteSlice":
            self.delete_slice(slice['name'])

        self.logit(wobj.name, args, kwargs, data, slice)

    # aspect method
    def after(self, wobj, data, *args, **kwargs):
        api_method_name = wobj.name
        slice_name_or_id = None
        node_ids = None
        if api_method_name == "AddSlice":
            slice_name_or_id = args[1]['name']
        elif api_method_name == "AddSliceToNodes" or api_method_name == "DeleteSliceFromNodes":
            slice_name_or_id = args[1]
            node_ids = args[2]
        else: # ignore the rest
            #self.logit(wobj.name, args, kwargs, data, "SLICE")
            return

        slice = self.get_slice(wobj.api, slice_name_or_id)
        if not slice:
            return

        if api_method_name == "AddSlice":
            self.create_slice(slice['name'])
        elif api_method_name == "AddSliceToNodes":
            for node_id in node_ids:
                node_hostname = self.get_node_hostname(wobj.api, node_id)
                self.add_resource(slice['name'], node_hostname)
        elif api_method_name == "DeleteSliceFromNodes":
            for node_id in node_ids:
                node_hostname = self.get_node_hostname(wobj.api, node_id)
                self.delete_resource(slice['name'], node_hostname)

        self.logit(wobj.name, args, kwargs, data, slice)



class OMFAspect_xmlrpc(BaseOMF):
    __metaclass__ = MetaAspect
    name = "omfaspect_xmlrpc"

    def __init__(self):
        BaseOMF.__init__(self)

        slicemgr_url = self.config.PLC_OMF_SLICEMGR_URL
        self.server = xmlrpclib.ServerProxy(slicemgr_url, allow_none = 1)

    def create_slice(self, slice):
        self.server.createSlice(slice)

    def add_resource(self, slice, resource):
        self.server.addResource(slice, resource)

    def delete_slice(self, slice):
        self.server.deleteSlice(slice)
        
    def delete_resource(self, slice, resource):
        self.server.removeResource(slice, resource)

    def before(self, wobj, data, *args, **kwargs):
        BaseOMF.before(self, wobj, data, *args, **kwargs)

    def after(self, wobj, data, *args, **kwargs):
        BaseOMF.after(self, wobj, data, *args, **kwargs)



OMFAspect = OMFAspect_xmlrpc