类：

class NovaApi():
    def __init__(self):
        self.ip = controller_ip
        self.port = nova_port
        self.http_protocol = http_protocol
        self.endpoint = '{}://{}:{}'.format(self.http_protocol, self.ip, self.port)
        self.token = Keystone.token
        self.admin_token = Keystone.admin_token
        self.DIR_PATH = os.path.dirname(__file__)
        self.log = Logger('../Log/Nova.log', level='info').logger

    def listVms(self):
        url = '{}/v2.1/servers'.format(self.endpoint)
        base_header["X-Auth-Token"] = self.token
        r = requests.get(url=url, headers=base_header, verify=False)
        if r.status_code == 200:
            res = json.loads(r.content)
            server_list = res.get('servers')
            return server_list
        else:
            self.log.error('list vms request failed! {}-{}'.format(r.status_code, r.content))
            return False

    @nova_new_header
    def addOneVmUseLocalDiskNet(self, name, imageRef, flavorRef, network_id,
                                    availability_zone="nova", diskConfig="AUTO", description=None,
                                    security_groups: list = [{"name": "default"}]):
        url = '{}/v2.1/servers'.format(self.endpoint)
        body = {
            "server": {
                "name": name,
                "imageRef": imageRef,
                "flavorRef": flavorRef,
                "availability_zone": availability_zone,
                "OS-DCF:diskConfig": diskConfig,
                "description": description,
                "security_groups": security_groups,
                "networks": [
                    {
                        "uuid": network_id,
                    }
                ]
            }
        }
        body = json.dumps(body)
        r = requests.post(url=url, data=body, headers=base_header, verify=False)
        if r.status_code == 202:
            res = json.loads(r.content)
            self.log.info('vm:{} create success!'.format(name))
            vm_info = res.get('server')
            return vm_info
        else:
            self.log.error('create vm failed!-{}-{}'.format(r.content,r.status_code))
            return False


这个类中方法都需要在请求的时候传递header，但是他们的header会有所区别，所以需要使用不同的装饰器进行解决，如上：@nova_new_header，会将self.token传递给装饰器中的base_header

装饰器：

def nova_new_header(func_or_cls):
    def wapper(self,*args, **kwargs):
        base_header["X-Auth-Token"] = self.token
        base_header["X-OpenStack-Nova-API-Version"] = '2.65'
        res = func_or_cls(self,*args, **kwargs)
        return res
    return wapper


这样就可以在装饰器中将__init__中的self.token传递给func_or_cls，并且同时定义了API的微版本号。




更多内容详见微信公众号：Python研究所

python装饰器装饰类方法；装饰器参数传递；传递self参数_json