问题导读 1.keystone是怎么通过WSGI接口访问其中的服务的？ [composite:main]
use = egg:Paste#urlmap
/v2.0 = public_api
[composite:admin]
use = egg:Paste#urlmap
/v2.0 = admin_api 复制代码 http://192.168.1.x:5000/v2.0/xxxxxxx (public endpoint)和http://192.168.1.x:35357/v2.0/xxxxx (admin port)[pipeline:public_api]
pipeline = access_log sizelimit url_normalize token_auth admin_token_auth xml_body json_body ec2_extension user_crud_extension public_service 复制代码 [filter:access_log]
paste.filter_factory = keystone.contrib.access:AccessLogMiddleware.factory
[filter:sizelimit]
paste.filter_factory = keystone.middleware:RequestBodySizeLimiter.factory
[filter:url_normalize]
paste.filter_factory = keystone.middleware:NormalizingFilter.factory
[filter:token_auth]
paste.filter_factory = keystone.middleware:TokenAuthMiddleware.factory
[filter:admin_token_auth]
paste.filter_factory = keystone.middleware:AdminTokenAuthMiddleware.factory
[filter:xml_body]
paste.filter_factory = keystone.middleware:XmlBodyMiddleware.factory
[filter:json_body]
paste.filter_factory = keystone.middleware:JsonBodyMiddleware.factory
[filter:ec2_extension]
paste.filter_factory = keystone.contrib.ec2:Ec2Extension.factory
[filter:user_crud_extension]
paste.filter_factory = keystone.contrib.user_crud:CrudExtension.factory
[app:public_service]
paste.app_factory = keystone.service:public_app_factory 复制代码 from keystone.contrib.access.core import * 复制代码 CONF = config.CONF
LOG = logging.getLogger('access')
APACHE_TIME_FORMAT = '%d/%b/%Y:%H:%M:%S'
APACHE_LOG_FORMAT = (
'%(remote_addr)s - %(remote_user)s [%(datetime)s] "%(method)s %(url)s '
'%(http_version)s" %(status)s %(content_length)s')
class AccessLogMiddleware(wsgi.Middleware):
"""Writes an access log to INFO."""
@webob.dec.wsgify
def __call__(self, request):
data = {
'remote_addr': request.remote_addr,
'remote_user': request.remote_user or '-',
'method': request.method,
'url': request.url,
'http_version': request.http_version,
'status': 500,
'content_length': '-'}
try:
response = request.get_response(self.application)
data['status'] = response.status_int
data['content_length'] = len(response.body) or '-'
finally:
# must be calculated *after* the application has been called
now = timeutils.utcnow()
# timeutils may not return UTC, so we can't hardcode +0000
data['datetime'] = '%s %s' % (now.strftime(APACHE_TIME_FORMAT),
now.strftime('%z') or '+0000')
LOG.info(APACHE_LOG_FORMAT % data)
return response 复制代码 #wsgi.Middleware类在keystone.commone下</pre>class Middleware(Application): """Base WSGI middleware. These classes require an application to be initialized that will be called next. By default the middleware will simply call its wrapped app, or you can override __call__ to customize its behavior. """ @classmethod def factory(cls, global_config, **local_config): """Used for paste app factories in paste.deploy config files. Any local configuration (that is, values under the [filter:APPNAME] section of the paste config) will be passed into the `__init__` method as kwargs. A hypothetical configuration would look like: [filter:analytics] redis_host = 127.0.0.1 paste.filter_factory = keystone.analytics:Analytics.factory which would result in a call to the `Analytics` class as import keystone.analytics keystone.analytics.Analytics(app, redis_host='127.0.0.1') You could of course re-implement the `factory` method in subclasses, but using the kwarg passing it shouldn't be necessary. """ def _factory(app): conf = global_config.copy() conf.update(local_config) return cls(app, **local_config)#__init__ here application=app return _factory<br> def __init__(self, application):<br> self.application = application 复制代码 复制代码 class RequestBodySizeLimiter(wsgi.Middleware):
"""Limit the size of an incoming request."""
def __init__(self, *args, **kwargs):
super(RequestBodySizeLimiter, self).__init__(*args, **kwargs)
@webob.dec.wsgify(RequestClass=wsgi.Request)
def __call__(self, req):
if req.content_length > CONF.max_request_body_size:
raise exception.RequestTooLarge()
if req.content_length is None and req.is_body_readable:
limiter = utils.LimitingReader(req.body_file,
CONF.max_request_body_size)
req.body_file = limiter
return self.application
判断request大小，如果大于最大值，则raise Excetion报异常，否则继续向下传递，url_normalize
class NormalizingFilter(wsgi.Middleware):
"""Middleware filter to handle URL normalization."""
def process_request(self, request):
"""Normalizes URLs."""
# Removes a trailing slash from the given path, if any.
if (len(request.environ['PATH_INFO']) > 1 and
request.environ['PATH_INFO'][-1] == '/'):
request.environ['PATH_INFO'] = request.environ['PATH_INFO'][:-1]
# Rewrites path to root if no path is given.
elif not request.environ['PATH_INFO']:
request.environ['PATH_INFO'] = '/' 复制代码 @webob.dec.wsgify(RequestClass=Request)
def __call__(self, request):
try:
response = self.process_request(request)
if response:
return response
response = request.get_response(self.application)
return self.process_response(request, response)
except exception.Error as e:
LOG.warning(e)
return render_exception(e,
user_locale=request.best_match_language())
except TypeError as e:
LOG.exception(e)
return render_exception(exception.ValidationError(e),
user_locale=request.best_match_language())
except Exception as e:
LOG.exception(e)
return render_exception(exception.UnexpectedError(exception=e),
user_locale=request.best_match_language()) 复制代码 class TokenAuthMiddleware(wsgi.Middleware):
def process_request(self, request):
token = request.headers.get(AUTH_TOKEN_HEADER)
context = request.environ.get(CONTEXT_ENV, {})
context['token_id'] = token
if SUBJECT_TOKEN_HEADER in request.headers:
context['subject_token_id'] = (
request.headers.get(SUBJECT_TOKEN_HEADER))
request.environ[CONTEXT_ENV] = context 复制代码 class AdminTokenAuthMiddleware(wsgi.Middleware):
"""A trivial filter that checks for a pre-defined admin token.
Sets 'is_admin' to true in the context, expected to be checked by
methods that are admin-only.
"""
def process_request(self, request):
token = request.headers.get(AUTH_TOKEN_HEADER)
context = request.environ.get(CONTEXT_ENV, {})
context['is_admin'] = (token == CONF.admin_token)
request.environ[CONTEXT_ENV] = context 复制代码 class XmlBodyMiddleware(wsgi.Middleware):
"""De/serializes XML to/from JSON."""
def process_request(self, request):
"""Transform the request from XML to JSON."""
incoming_xml = 'application/xml' in str(request.content_type)
if incoming_xml and request.body:
request.content_type = 'application/json'
try:
request.body = jsonutils.dumps(
serializer.from_xml(request.body))
except Exception:
LOG.exception('Serializer failed')
e = exception.ValidationError(attribute='valid XML',
target='request body')
return wsgi.render_exception(e) 复制代码 class JsonBodyMiddleware(wsgi.Middleware):
"""Middleware to allow method arguments to be passed as serialized JSON.
Accepting arguments as JSON is useful for accepting data that may be more
complex than simple primitives.
In this case we accept it as urlencoded data under the key 'json' as in
json= but this could be extended to accept raw JSON
in the POST body.
Filters out the parameters `self`, `context` and anything beginning with
an underscore.
"""
def process_request(self, request):
# Abort early if we don't have any work to do
params_json = request.body
if not params_json:
return
# Reject unrecognized content types. Empty string indicates
# the client did not explicitly set the header
if request.content_type not in ('application/json', ''):
e = exception.ValidationError(attribute='application/json',
target='Content-Type header')
return wsgi.render_exception(e)
params_parsed = {}
try:
params_parsed = jsonutils.loads(params_json)
except ValueError:
e = exception.ValidationError(attribute='valid JSON',
target='request body')
return wsgi.render_exception(e)
finally:
if not params_parsed:
params_parsed = {}
params = {}
for k, v in params_parsed.iteritems():
if k in ('self', 'context'):
continue
if k.startswith('_'):
continue
params[k] = v
request.environ[PARAMS_ENV] = params 复制代码 class Ec2Extension(wsgi.ExtensionRouter):
def add_routes(self, mapper):
ec2_controller = controllers.Ec2Controller()
# validation
mapper.connect(
'/ec2tokens',
controller=ec2_controller,
action='authenticate',
conditions=dict(method=['POST']))
# crud
mapper.connect(
'/users/{user_id}/credentials/OS-EC2',
controller=ec2_controller,
action='create_credential',
conditions=dict(method=['POST']))
mapper.connect(
'/users/{user_id}/credentials/OS-EC2',
controller=ec2_controller,
action='get_credentials',
conditions=dict(method=['GET']))
mapper.connect(
'/users/{user_id}/credentials/OS-EC2/{credential_id}',
controller=ec2_controller,
action='get_credential',
conditions=dict(method=['GET']))
mapper.connect(
'/users/{user_id}/credentials/OS-EC2/{credential_id}',
controller=ec2_controller,
action='delete_credential',
conditions=dict(method=['DELETE'])) 复制代码 class ExtensionRouter(Router):
"""A router that allows extensions to supplement or overwrite routes.
Expects to be subclassed.
"""
def __init__(self, application, mapper=None):
if mapper is None:
mapper = routes.Mapper()
self.application = application
self.add_routes(mapper)
mapper.connect('{path_info:.*}', controller=self.application)
super(ExtensionRouter, self).__init__(mapper)
def add_routes(self, mapper):
pass
@classmethod
def factory(cls, global_config, **local_config):
"""Used for paste app factories in paste.deploy config files.
Any local configuration (that is, values under the [filter:APPNAME]
section of the paste config) will be passed into the `__init__` method
as kwargs.
A hypothetical configuration would look like:
[filter:analytics]
redis_host = 127.0.0.1
paste.filter_factory = keystone.analytics:Analytics.factory
which would result in a call to the `Analytics` class as
import keystone.analytics
keystone.analytics.Analytics(app, redis_host='127.0.0.1')
You could of course re-implement the `factory` method in subclasses,
but using the kwarg passing it shouldn't be necessary.
"""
def _factory(app):
conf = global_config.copy()
conf.update(local_config)
return cls(app, **local_config)
return _factory 复制代码 EXTENSION_DATA = {
'name': 'OpenStack EC2 API',
'namespace': 'http://docs.openstack.org/identity/api/ext/'
'OS-EC2/v1.0',
'alias': 'OS-EC2',
'updated': '2013-07-07T12:00:0-00:00',
'description': 'OpenStack EC2 Credentials backend.',
'links': [
{
'rel': 'describedby',
# TODO(ayoung): needs a description
'type': 'text/html',
'href': 'https://github.com/openstack/identity-api',
}
]}
extension.register_admin_extension(EXTENSION_DATA['alias'], EXTENSION_DATA)
extension.register_public_extension(EXTENSION_DATA['alias'], EXTENSION_DATA) 复制代码 @fail_gracefully
def public_app_factory(global_conf, **local_conf):
controllers.register_version('v2.0')
conf = global_conf.copy()
conf.update(local_conf)
return wsgi.ComposingRouter(routes.Mapper(),
[identity.routers.Public(),
token.routers.Router(),
routers.VersionV2('public'),
routers.Extension(False)]) 复制代码 class ComposingRouter(Router):
def __init__(self, mapper=None, routers=None):
if mapper is None:
mapper = routes.Mapper()
if routers is None:
routers = []
for router in routers:
router.add_routes(mapper)
super(ComposingRouter, self).__init__(mapper)
复制代码 class Extension(wsgi.ComposableRouter):
def __init__(self, is_admin=True):
if is_admin:
self.controller = controllers.AdminExtensions()
else:
self.controller = controllers.PublicExtensions()
def add_routes(self, mapper):
extensions_controller = self.controller
mapper.connect('/extensions',
controller=extensions_controller,
action='get_extensions_info',
conditions=dict(method=['GET']))
mapper.connect('/extensions/{extension_alias}',
controller=extensions_controller,
action='get_extension_info',
conditions=dict(method=['GET'])) 复制代码 class PublicExtensions(Extensions):
@property
def extensions(self):
return extension.PUBLIC_EXTENSIONS 复制代码 extension.register_public_extension(EXTENSION_DATA['alias'], EXTENSION_DATA) 复制代码 def register_public_extension(url_prefix, extension_data):
"""Same as register_admin_extension but for public extensions."""
PUBLIC_EXTENSIONS[url_prefix] = extension_data 复制代码 相关文章 http://www.aboutyun.com/thread-10139-1-1.html http://www.aboutyun.com/thread-10138-1-1.html http://www.aboutyun.com/thread-10136-1-1.html 
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