自己动手写OpenStack的QoS功能(3)

本文地址：http://blog.csdn.net/spch2008/article/details/9281779

创建数据库以及相应的操作：

/usr/share/pyshared/quantum/plugins/openvswitch/ 下创建ovs_qos_db.py，

然后将其连接到/usr/lib/python2.7/dist-packages/quantum/plugins/openvswitch下，可参见Quantum 数据库增加新表 

ovs_qos_db.py

import sqlalchemy as sa
from sqlalchemy import orm
from sqlalchemy.orm import exc

from quantum.db import model_base
from quantum.db import models_v2

from quantum.openstack.common import log as logging
from quantum.plugins.openvswitch.extensions import ovsqos


LOG = logging.getLogger(__name__)

class QualityOfServicePortBinding(model_base.BASEV2):
    
    __tablename__ = 'ovs_qos_port_bindings'
    
    port_id = sa.Column(sa.String(255),
                        primary_key=True)
    rule_id = sa.Column(sa.String(255))

class QualityOfServiceRule(model_base.BASEV2, models_v2.HasId, models_v2.HasTenant):

    __tablename__ = 'ovs_qos_rules'
    
    name = sa.Column(sa.String(255))
    rate = sa.Column(sa.Integer)
    burst = sa.Column(sa.Integer)

class QualityOfServiceDbMixin(ovsqos.OVSPluginBase):
  
    __native_bulk_support = True
    
    def create_ovsqos(self, context, ovsqos):
        qos_rule = ovsqos['ovsqos']
        with context.session.begin(subtransactions=True):
            qos = QualityOfServiceRule(
                      name=qos_rule.get('name'), 
                      rate=qos_rule.get('rate'),
                      burst=qos_rule.get('burst'),
                      tenant_id=qos_rule.get('tenant_id'))
            context.session.add(qos)
        return self._make_qos_rule_dict(qos)
    
    def get_ovsqoss(self, context, filters, fields):
        
        return self._get_collection(context, QualityOfServiceRule,
                                    self._make_qos_rule_dict,
                                    filters=filters, fields=fields)
     
    
    def get_ovsqos(self, context, rule_id, fields=None):
        return self._make_qos_rule_dict(
            self._get_ovsqos(context, rule_id), fields)

    def _get_ovsqos(self, context, rule_id):
        try:
            return self._get_by_id(context, QualityOfServiceRule, rule_id)
        except exc.NoResultFound:
            return None
        
    def delete_ovsqos(self, context, rule_id):
        qos = self._get_ovsqos(context, rule_id)
        with context.session.begin(subtransactions=True):
            context.session.delete(qos)
       
    def update_ovsqos(self, context, rule_id, ovsqos):
        rule = ovsqos['ovsqos']
        with context.session.begin(subtransactions=True):
            qos = self._get_ovsqos(context, rule_id)
            qos.update(rule)
       
        return self._make_qos_rule_dict(qos)
        
    
    def _make_qos_rule_dict(self, qos, fields=None):
        res = {'id': qos.id,
               'name': qos.name,
               'rate': qos.rate,
               'burst': qos.burst,
               'tenant_id':qos.tenant_id}
        return self._fields(res, fields)  
           

数据库很简陋，只有一些基本功能。