openstack context

之前一直不知道context模块中存储的是什么东西，这回看一下代码；

其中最主要的类是：RequestContext；

class RequestContext(object):

 

"""Helper class to represent useful information about a request context.

 

Stores information about the security context under which the user

accesses the system, as well as additional request information.

"""

 

    user_idt_format = '{user} {tenant} {domain} {user_domain} {p_domain}'

 

    def __init__(self, auth_token=None, user=None, tenant=None, domain=None,

                       user_domain=None, project_domain=None, is_admin=False,

                       read_only=False, show_deleted=False, request_id=None,

                       instance_uuid=None):

        self.auth_token = auth_token

        self.user = user

        self.tenant = tenant

        self.domain = domain

        self.user_domain = user_domain

        self.project_domain = project_domain

        self.is_admin = is_admin

        self.read_only = read_only

        self.show_deleted = show_deleted

        self.instance_uuid = instance_uuid

        if not request_id:

            request_id = generate_request_id()

        self.request_id = request_id

        …...

｝

"""Helper class to represent useful information about a request context.

 

Stores information about the security context under which the user

accesses the system, as well as additional request information.

"""

RequestContext类主要保存了一次web请求的useful context information，主要包括安全验证信息和其他一些信息；

如果用户想要对request的上下文新增一些信息，或加强功能，可以继承这个类；

 

其中两个函数分别获取admin上下文信息，和判断一个context是不是一个normal user：

def get_admin_context(show_deleted=False):

    context = RequestContext(None,

                    tenant=None,

                    is_admin=True,

                    show_deleted=show_deleted)

    return context

 

def is_user_context(context):

"""Indicates if the request context is a normal user."""

    if not context:

        return False

    if context.is_admin:

        return False

    if not context.user_id or not context.project_id:

        return False

    return True