def _listing_pages_iter(self, account_name, lcontainer, lprefix, env):
        marker = ''
        while True:
            lreq = make_pre_authed_request(
                env, method='GET', swift_source='VW',
                path='/v1/%s/%s' % (account_name, lcontainer))
            lreq.environ['QUERY_STRING'] = \
                'format=json&prefix=%s&marker=%s' % (quote(lprefix),
                                                     quote(marker))
            lresp = lreq.get_response(self.app)
            if not is_success(lresp.status_int):
                if lresp.status_int == HTTP_NOT_FOUND:
                    raise ListingIterNotFound()
                elif is_client_error(lresp.status_int):
                    raise HTTPPreconditionFailed()
                else:
                    raise ListingIterError()

            if not lresp.body:
                break

            sublisting = json.loads(lresp.body)
            if not sublisting:
                break
            marker = sublisting[-1]['name'].encode('utf-8')
            yield sublisting

    def _listing_pages_iter(self, account_name, lcontainer, lprefix,
                            env, marker='', end_marker='', reverse=True):
        '''Get "pages" worth of objects that start with a prefix.

        The optional keyword arguments ``marker``, ``end_marker``, and
        ``reverse`` are used similar to how they are for containers. We're
        either coming:

           - directly from ``_listing_iter``, in which case none of the
             optional args are specified, or

           - from ``_in_proxy_reverse_listing``, in which case ``reverse``
             is ``False`` and both ``marker`` and ``end_marker`` are specified
             (although they may still be blank).
        '''
        while True:
            lreq = make_pre_authed_request(
                env, method='GET', swift_source='VW',
                path='/v1/%s/%s' % (account_name, lcontainer))
            lreq.environ['QUERY_STRING'] = \
                'format=json&prefix=%s&marker=%s' % (
                    quote(lprefix), quote(marker))
            if end_marker:
                lreq.environ['QUERY_STRING'] += '&end_marker=%s' % (
                    quote(end_marker))
            if reverse:
                lreq.environ['QUERY_STRING'] += '&reverse=on'
            lresp = lreq.get_response(self.app)
            if not is_success(lresp.status_int):
                close_if_possible(lresp.app_iter)
                if lresp.status_int == HTTP_NOT_FOUND:
                    raise ListingIterNotFound()
                elif is_client_error(lresp.status_int):
                    raise HTTPPreconditionFailed()
                else:
                    raise ListingIterError()

            if not lresp.body:
                break

            sublisting = json.loads(lresp.body)
            if not sublisting:
                break

            # When using the ``reverse`` param, check that the listing is
            # actually reversed
            first_item = sublisting[0]['name'].encode('utf-8')
            last_item = sublisting[-1]['name'].encode('utf-8')
            page_is_after_marker = marker and first_item > marker
            if reverse and (first_item < last_item or page_is_after_marker):
                # Apparently there's at least one pre-2.6.0 container server
                yield self._in_proxy_reverse_listing(
                    account_name, lcontainer, lprefix,
                    env, marker, sublisting)
                return

            marker = last_item
            yield sublisting

 def _check_response_error(self, req, resp):
     """
     Raise Error Response in case of error
     """
     if is_success(resp.status_int):
         return
     if is_client_error(resp.status_int):
         # missing container or bad permissions
         raise HTTPPreconditionFailed(request=req)
     # could not version the data, bail
     raise HTTPServiceUnavailable(request=req)

    def DELETE(self, req):
        """HTTP DELETE request handler."""
        container_info = self.container_info(
            self.account_name, self.container_name, req)
        # pass the policy index to storage nodes via req header
        policy_index = req.headers.get('X-Backend-Storage-Policy-Index',
                                       container_info['storage_policy'])
        obj_ring = self.app.get_object_ring(policy_index)
        # pass the policy index to storage nodes via req header
        req.headers['X-Backend-Storage-Policy-Index'] = policy_index
        container_partition = container_info['partition']
        containers = container_info['nodes']
        req.acl = container_info['write_acl']
        req.environ['swift_sync_key'] = container_info['sync_key']
        object_versions = container_info['versions']
        if object_versions:
            # this is a version manifest and needs to be handled differently
            object_versions = unquote(object_versions)
            lcontainer = object_versions.split('/')[0]
            prefix_len = '%03x' % len(self.object_name)
            lprefix = prefix_len + self.object_name + '/'
            item_list = []
            try:
                for _item in self._listing_iter(lcontainer, lprefix,
                                                req.environ):
                    item_list.append(_item)
            except ListingIterNotFound:
                # no worries, last_item is None
                pass
            except ListingIterNotAuthorized as err:
                return err.aresp
            except ListingIterError:
                return HTTPServerError(request=req)

            while len(item_list) > 0:
                previous_version = item_list.pop()
                # there are older versions so copy the previous version to the
                # current object and delete the previous version
                orig_container = self.container_name
                orig_obj = self.object_name
                self.container_name = lcontainer
                self.object_name = previous_version['name'].encode('utf-8')

                copy_path = '/v1/' + self.account_name + '/' + \
                            self.container_name + '/' + self.object_name

                copy_headers = {'X-Newest': 'True',
                                'Destination': orig_container + '/' + orig_obj
                                }
                copy_environ = {'REQUEST_METHOD': 'COPY',
                                'swift_versioned_copy': True
                                }
                creq = Request.blank(copy_path, headers=copy_headers,
                                     environ=copy_environ)
                copy_resp = self.COPY(creq)
                if copy_resp.status_int == HTTP_NOT_FOUND:
                    # the version isn't there so we'll try with previous
                    self.container_name = orig_container
                    self.object_name = orig_obj
                    continue
                if is_client_error(copy_resp.status_int):
                    # some user error, maybe permissions
                    return HTTPPreconditionFailed(request=req)
                elif not is_success(copy_resp.status_int):
                    # could not copy the data, bail
                    return HTTPServiceUnavailable(request=req)
                # reset these because the COPY changed them
                self.container_name = lcontainer
                self.object_name = previous_version['name'].encode('utf-8')
                new_del_req = Request.blank(copy_path, environ=req.environ)
                container_info = self.container_info(
                    self.account_name, self.container_name, req)
                policy_idx = container_info['storage_policy']
                obj_ring = self.app.get_object_ring(policy_idx)
                # pass the policy index to storage nodes via req header
                new_del_req.headers['X-Backend-Storage-Policy-Index'] = \
                    policy_idx
                container_partition = container_info['partition']
                containers = container_info['nodes']
                new_del_req.acl = container_info['write_acl']
                new_del_req.path_info = copy_path
                req = new_del_req
                # remove 'X-If-Delete-At', since it is not for the older copy
                if 'X-If-Delete-At' in req.headers:
                    del req.headers['X-If-Delete-At']
                break
        if 'swift.authorize' in req.environ:
            aresp = req.environ['swift.authorize'](req)
            if aresp:
                return aresp
        if not containers:
            return HTTPNotFound(request=req)
        partition, nodes = obj_ring.get_nodes(
            self.account_name, self.container_name, self.object_name)
        # Used by container sync feature
        if 'x-timestamp' in req.headers:
            try:
                req_timestamp = Timestamp(req.headers['X-Timestamp'])
            except ValueError:
                return HTTPBadRequest(
#.........这里部分代码省略.........

#.........这里部分代码省略.........
            except ValueError:
                return HTTPBadRequest(
                    request=req, content_type='text/plain',
                    body='X-Timestamp should be a UNIX timestamp float value; '
                         'was %r' % req.headers['x-timestamp'])
            req.headers['X-Timestamp'] = req_timestamp.internal
        else:
            req.headers['X-Timestamp'] = Timestamp(time.time()).internal

        if object_versions and not req.environ.get('swift_versioned_copy'):
            if hresp.status_int != HTTP_NOT_FOUND:
                # This is a version manifest and needs to be handled
                # differently. First copy the existing data to a new object,
                # then write the data from this request to the version manifest
                # object.
                lcontainer = object_versions.split('/')[0]
                prefix_len = '%03x' % len(self.object_name)
                lprefix = prefix_len + self.object_name + '/'
                ts_source = hresp.environ.get('swift_x_timestamp')
                if ts_source is None:
                    ts_source = time.mktime(time.strptime(
                                            hresp.headers['last-modified'],
                                            '%a, %d %b %Y %H:%M:%S GMT'))
                new_ts = Timestamp(ts_source).internal
                vers_obj_name = lprefix + new_ts
                copy_headers = {
                    'Destination': '%s/%s' % (lcontainer, vers_obj_name)}
                copy_environ = {'REQUEST_METHOD': 'COPY',
                                'swift_versioned_copy': True
                                }
                copy_req = Request.blank(req.path_info, headers=copy_headers,
                                         environ=copy_environ)
                copy_resp = self.COPY(copy_req)
                if is_client_error(copy_resp.status_int):
                    # missing container or bad permissions
                    return HTTPPreconditionFailed(request=req)
                elif not is_success(copy_resp.status_int):
                    # could not copy the data, bail
                    return HTTPServiceUnavailable(request=req)

        reader = req.environ['wsgi.input'].read
        data_source = iter(lambda: reader(self.app.client_chunk_size), '')
        source_header = req.headers.get('X-Copy-From')
        source_resp = None
        if source_header:
            if req.environ.get('swift.orig_req_method', req.method) != 'POST':
                req.environ.setdefault('swift.log_info', []).append(
                    'x-copy-from:%s' % source_header)
            ver, acct, _rest = req.split_path(2, 3, True)
            src_account_name = req.headers.get('X-Copy-From-Account', None)
            if src_account_name:
                src_account_name = check_account_format(req, src_account_name)
            else:
                src_account_name = acct
            src_container_name, src_obj_name = check_copy_from_header(req)
            source_header = '/%s/%s/%s/%s' % (ver, src_account_name,
                            src_container_name, src_obj_name)
            source_req = req.copy_get()

            # make sure the source request uses it's container_info
            source_req.headers.pop('X-Backend-Storage-Policy-Index', None)
            source_req.path_info = source_header
            source_req.headers['X-Newest'] = 'true'
            orig_obj_name = self.object_name
            orig_container_name = self.container_name
            orig_account_name = self.account_name

    def handle_obj_versions_delete(self, req, object_versions,
                                   account_name, container_name, object_name):
        lcontainer = object_versions.split('/')[0]
        prefix_len = '%03x' % len(object_name)
        lprefix = prefix_len + object_name + '/'
        item_list = []
        try:
            for _item in self._listing_iter(account_name, lcontainer, lprefix,
                                            req.environ):
                item_list.append(_item)
        except ListingIterNotFound:
            pass
        except HTTPPreconditionFailed:
            return HTTPPreconditionFailed(request=req)
        except ListingIterError:
            return HTTPServerError(request=req)

        if item_list:
            # we're about to start making COPY requests - need to validate the
            # write access to the versioned container
            if 'swift.authorize' in req.environ:
                container_info = get_container_info(
                    req.environ, self.app)
                req.acl = container_info.get('write_acl')
                aresp = req.environ['swift.authorize'](req)
                if aresp:
                    return aresp

        while len(item_list) > 0:
            previous_version = item_list.pop()

            # there are older versions so copy the previous version to the
            # current object and delete the previous version
            prev_obj_name = previous_version['name'].encode('utf-8')

            copy_path = '/v1/' + account_name + '/' + \
                        lcontainer + '/' + prev_obj_name

            copy_headers = {'X-Newest': 'True',
                            'Destination': container_name + '/' + object_name,
                            'x-auth-token': req.headers.get('x-auth-token')}

            copy_req = make_pre_authed_request(
                req.environ, path=copy_path,
                headers=copy_headers, method='COPY', swift_source='VW')
            copy_resp = copy_req.get_response(self.app)

            # if the version isn't there, keep trying with previous version
            if copy_resp.status_int == HTTP_NOT_FOUND:
                continue

            if not is_success(copy_resp.status_int):
                if is_client_error(copy_resp.status_int):
                    # some user error, maybe permissions
                    return HTTPPreconditionFailed(request=req)
                else:
                    # could not copy the data, bail
                    return HTTPServiceUnavailable(request=req)

            # reset these because the COPY changed them
            new_del_req = make_pre_authed_request(
                req.environ, path=copy_path, method='DELETE',
                swift_source='VW')
            req = new_del_req

            # remove 'X-If-Delete-At', since it is not for the older copy
            if 'X-If-Delete-At' in req.headers:
                del req.headers['X-If-Delete-At']
            break

        # handle DELETE request here in case it was modified
        return req.get_response(self.app)

    def handle_obj_versions_put(self, req, object_versions,
                                object_name, policy_index):
        ret = None

        # do a HEAD request to check object versions
        _headers = {'X-Newest': 'True',
                    'X-Backend-Storage-Policy-Index': policy_index,
                    'x-auth-token': req.headers.get('x-auth-token')}

        # make a pre_auth request in case the user has write access
        # to container, but not READ. This was allowed in previous version
        # (i.e., before middleware) so keeping the same behavior here
        head_req = make_pre_authed_request(
            req.environ, path=req.path_info,
            headers=_headers, method='HEAD', swift_source='VW')
        hresp = head_req.get_response(self.app)

        is_dlo_manifest = 'X-Object-Manifest' in req.headers or \
                          'X-Object-Manifest' in hresp.headers

        # if there's an existing object, then copy it to
        # X-Versions-Location
        if is_success(hresp.status_int) and not is_dlo_manifest:
            lcontainer = object_versions.split('/')[0]
            prefix_len = '%03x' % len(object_name)
            lprefix = prefix_len + object_name + '/'
            ts_source = hresp.environ.get('swift_x_timestamp')
            if ts_source is None:
                ts_source = time.mktime(time.strptime(
                                        hresp.headers['last-modified'],
                                        '%a, %d %b %Y %H:%M:%S GMT'))
            new_ts = Timestamp(ts_source).internal
            vers_obj_name = lprefix + new_ts
            copy_headers = {
                'Destination': '%s/%s' % (lcontainer, vers_obj_name),
                'x-auth-token': req.headers.get('x-auth-token')}

            # COPY implementation sets X-Newest to True when it internally
            # does a GET on source object. So, we don't have to explicity
            # set it in request headers here.
            copy_req = make_pre_authed_request(
                req.environ, path=req.path_info,
                headers=copy_headers, method='COPY', swift_source='VW')
            copy_resp = copy_req.get_response(self.app)

            if is_success(copy_resp.status_int):
                # success versioning previous existing object
                # return None and handle original request
                ret = None
            else:
                if is_client_error(copy_resp.status_int):
                    # missing container or bad permissions
                    ret = HTTPPreconditionFailed(request=req)
                else:
                    # could not copy the data, bail
                    ret = HTTPServiceUnavailable(request=req)

        else:
            if hresp.status_int == HTTP_NOT_FOUND or is_dlo_manifest:
                # nothing to version
                # return None and handle original request
                ret = None
            else:
                # if not HTTP_NOT_FOUND, return error immediately
                ret = hresp

        return ret

#.........这里部分代码省略.........
            if detect_content_type:
                req.headers.pop('x-detect-content-type')
            else:
                content_type_manually_set = False

        error_response = check_object_creation(req, self.object_name) or \
            check_content_type(req)
        if error_response:
            return error_response
        if object_versions and not req.environ.get('swift_versioned_copy'):
            if hresp.status_int != HTTP_NOT_FOUND:
                # This is a version manifest and needs to be handled
                # differently. First copy the existing data to a new object,
                # then write the data from this request to the version manifest
                # object.
                lcontainer = object_versions.split('/')[0]
                prefix_len = '%03x' % len(self.object_name)
                lprefix = prefix_len + self.object_name + '/'
                ts_source = hresp.environ.get('swift_x_timestamp')
                if ts_source is None:
                    ts_source = time.mktime(time.strptime(
                                            hresp.headers['last-modified'],
                                            '%a, %d %b %Y %H:%M:%S GMT'))
                new_ts = normalize_timestamp(ts_source)
                vers_obj_name = lprefix + new_ts
                copy_headers = {
                    'Destination': '%s/%s' % (lcontainer, vers_obj_name)}
                copy_environ = {'REQUEST_METHOD': 'COPY',
                                'swift_versioned_copy': True
                                }
                copy_req = Request.blank(req.path_info, headers=copy_headers,
                                         environ=copy_environ)
                copy_resp = self.COPY(copy_req)
                if is_client_error(copy_resp.status_int):
                    # missing container or bad permissions
                    return HTTPPreconditionFailed(request=req)
                elif not is_success(copy_resp.status_int):
                    # could not copy the data, bail
                    return HTTPServiceUnavailable(request=req)

        reader = req.environ['wsgi.input'].read
        data_source = iter(lambda: reader(self.app.client_chunk_size), '')
        source_header = req.headers.get('X-Copy-From')
        source_resp = None
        if source_header:
            if req.environ.get('swift.orig_req_method', req.method) != 'POST':
                req.environ.setdefault('swift.log_info', []).append(
                    'x-copy-from:%s' % source_header)
            src_container_name, src_obj_name = check_copy_from_header(req)
            ver, acct, _rest = req.split_path(2, 3, True)
            if isinstance(acct, unicode):
                acct = acct.encode('utf-8')
            source_header = '/%s/%s/%s/%s' % (ver, acct,
                                              src_container_name, src_obj_name)
            source_req = req.copy_get()
            source_req.path_info = source_header
            source_req.headers['X-Newest'] = 'true'
            orig_obj_name = self.object_name
            orig_container_name = self.container_name
            self.object_name = src_obj_name
            self.container_name = src_container_name
            sink_req = Request.blank(req.path_info,
                                     environ=req.environ, headers=req.headers)
            source_resp = self.GET(source_req)
            # This gives middlewares a way to change the source; for example,
            # this lets you COPY a SLO manifest and have the new object be the

    def PUT(self, req):
        """HTTP PUT request handler."""
        if req.if_none_match is not None and "*" not in req.if_none_match:
            # Sending an etag with if-none-match isn't currently supported
            return HTTPBadRequest(request=req, content_type="text/plain", body="If-None-Match only supports *")
        container_info = self.container_info(self.account_name, self.container_name, req)
        policy_index = req.headers.get("X-Backend-Storage-Policy-Index", container_info["storage_policy"])
        obj_ring = self.app.get_object_ring(policy_index)
        # pass the policy index to storage nodes via req header
        req.headers["X-Backend-Storage-Policy-Index"] = policy_index
        container_partition = container_info["partition"]
        containers = container_info["nodes"]
        req.acl = container_info["write_acl"]
        req.environ["swift_sync_key"] = container_info["sync_key"]
        object_versions = container_info["versions"]
        if "swift.authorize" in req.environ:
            aresp = req.environ["swift.authorize"](req)
            if aresp:
                return aresp
        if not containers:
            return HTTPNotFound(request=req)
        try:
            ml = req.message_length()
        except ValueError as e:
            return HTTPBadRequest(request=req, content_type="text/plain", body=str(e))
        except AttributeError as e:
            return HTTPNotImplemented(request=req, content_type="text/plain", body=str(e))
        if ml is not None and ml > constraints.MAX_FILE_SIZE:
            return HTTPRequestEntityTooLarge(request=req)
        if "x-delete-after" in req.headers:
            try:
                x_delete_after = int(req.headers["x-delete-after"])
            except ValueError:
                return HTTPBadRequest(request=req, content_type="text/plain", body="Non-integer X-Delete-After")
            req.headers["x-delete-at"] = normalize_delete_at_timestamp(time.time() + x_delete_after)
        partition, nodes = obj_ring.get_nodes(self.account_name, self.container_name, self.object_name)
        # do a HEAD request for container sync and checking object versions
        if "x-timestamp" in req.headers or (object_versions and not req.environ.get("swift_versioned_copy")):
            # make sure proxy-server uses the right policy index
            _headers = {
                "X-Backend-Storage-Policy-Index": req.headers["X-Backend-Storage-Policy-Index"],
                "X-Newest": "True",
            }
            hreq = Request.blank(req.path_info, headers=_headers, environ={"REQUEST_METHOD": "HEAD"})
            hresp = self.GETorHEAD_base(hreq, _("Object"), obj_ring, partition, hreq.swift_entity_path)
        # Used by container sync feature
        if "x-timestamp" in req.headers:
            try:
                req_timestamp = Timestamp(req.headers["X-Timestamp"])
                if (
                    hresp.environ
                    and "swift_x_timestamp" in hresp.environ
                    and hresp.environ["swift_x_timestamp"] >= req_timestamp
                ):
                    return HTTPAccepted(request=req)
            except ValueError:
                return HTTPBadRequest(
                    request=req,
                    content_type="text/plain",
                    body="X-Timestamp should be a UNIX timestamp float value; " "was %r" % req.headers["x-timestamp"],
                )
            req.headers["X-Timestamp"] = req_timestamp.internal
        else:
            req.headers["X-Timestamp"] = Timestamp(time.time()).internal
        # Sometimes the 'content-type' header exists, but is set to None.
        content_type_manually_set = True
        detect_content_type = config_true_value(req.headers.get("x-detect-content-type"))
        if detect_content_type or not req.headers.get("content-type"):
            guessed_type, _junk = mimetypes.guess_type(req.path_info)
            req.headers["Content-Type"] = guessed_type or "application/octet-stream"
            if detect_content_type:
                req.headers.pop("x-detect-content-type")
            else:
                content_type_manually_set = False

        error_response = check_object_creation(req, self.object_name) or check_content_type(req)
        if error_response:
            return error_response
        if object_versions and not req.environ.get("swift_versioned_copy"):
            if hresp.status_int != HTTP_NOT_FOUND:
                # This is a version manifest and needs to be handled
                # differently. First copy the existing data to a new object,
                # then write the data from this request to the version manifest
                # object.
                lcontainer = object_versions.split("/")[0]
                prefix_len = "%03x" % len(self.object_name)
                lprefix = prefix_len + self.object_name + "/"
                ts_source = hresp.environ.get("swift_x_timestamp")
                if ts_source is None:
                    ts_source = time.mktime(time.strptime(hresp.headers["last-modified"], "%a, %d %b %Y %H:%M:%S GMT"))
                new_ts = Timestamp(ts_source).internal
                vers_obj_name = lprefix + new_ts
                copy_headers = {"Destination": "%s/%s" % (lcontainer, vers_obj_name)}
                copy_environ = {"REQUEST_METHOD": "COPY", "swift_versioned_copy": True}
                copy_req = Request.blank(req.path_info, headers=copy_headers, environ=copy_environ)
                copy_resp = self.COPY(copy_req)
                if is_client_error(copy_resp.status_int):
                    # missing container or bad permissions
                    return HTTPPreconditionFailed(request=req)
                elif not is_success(copy_resp.status_int):
#.........这里部分代码省略.........

    def PUT(self, req):
        
        account_partition, accounts = self.account_info(self.account_name,autocreate=False)
        account = accounts[0]
        (container_partition, containers,object_versions ) = self.container_info(self.account_name, self.container_name,
                account_autocreate=self.app.account_autocreate)
        
        if not containers:
            return jresponse('-1', 'not found', req,404)
        
        
        delete_at_part = delete_at_nodes = None
        
        partition, nodes = self.app.object_ring.get_nodes(self.account_name, self.container_name, self.object_name)
        req.headers['X-Timestamp'] = normalize_timestamp(time.time())
        
        error_response = check_object_creation(req, self.object_name)
        if error_response:
            return error_response
        
        overwrite = req.GET.get('overwrite')
        
        if 'true'==overwrite and object_versions :
            
            hreq = Request.blank(req.path_info, environ={'REQUEST_METHOD': 'HEAD'})
            hresp = self.GETorHEAD_base(hreq, _('Object'), partition, nodes,
                hreq.path_info, len(nodes))
            
            is_manifest = 'x-static-large-object' in req.headers or \
                          'x-static-large-object' in hresp.headers
                          
            if hresp.status_int != HTTP_NOT_FOUND and not is_manifest:
                
                lcontainer = object_versions.split('/')[0]
                lprefix = self.object_name + '/'
                
                new_ts = normalize_timestamp(float(time.time()))
                vers_obj_name = lprefix + new_ts
                
                move_headers = {
                    'Destination': '/%s/%s' % (lcontainer, vers_obj_name)}
                move_req = Request.blank(req.path_info, headers=move_headers)
                move_resp = self.MOVE_VERSION(move_req)
                if is_client_error(move_resp.status_int):
                    # missing container or bad permissions
                    return jresponse('-1', 'bad permissions', req,412)
                elif not is_success(move_resp.status_int):
                    # could not copy the data, bail
                    return jresponse('-1', 'ServiceUnavailable', req,503)
                
        reader = req.environ['wsgi.input'].read
        data_source = iter(lambda: reader(self.app.client_chunk_size), '')
        
            
        node_iter = self.iter_nodes(partition, nodes, self.app.object_ring)
        pile = GreenPile(len(nodes))
        for container in containers:
            nheaders = dict(req.headers.iteritems())
            nheaders['Connection'] = 'close'
            nheaders['X-Container-Host'] = '%(ip)s:%(port)s' % container
            nheaders['X-Container-Partition'] = container_partition
            nheaders['X-Container-Device'] = container['device']
            
            nheaders['X-Account-Host'] = '%(ip)s:%(port)s' % account
            nheaders['X-Account-Partition'] = account_partition
            nheaders['X-Account-Device'] = self.account_name
                        
            nheaders['Expect'] = '100-continue'
            if delete_at_nodes:
                node = delete_at_nodes.pop(0)
                nheaders['X-Delete-At-Host'] = '%(ip)s:%(port)s' % node
                nheaders['X-Delete-At-Partition'] = delete_at_part
                nheaders['X-Delete-At-Device'] = node['device']
                
            if overwrite:
                nheaders['x-overwrite'] = overwrite
                
            pile.spawn(self._connect_put_node,self.account_name, node_iter, partition,
                       req.path_info, nheaders, self.app.logger.thread_locals,req.query_string)
        conns = [conn for conn in pile if conn]
        if len(conns) <= len(nodes) / 2:
            self.app.logger.error(
                _('Object PUT returning 503, %(conns)s/%(nodes)s '
                'required connections'),
                {'conns': len(conns), 'nodes': len(nodes) // 2 + 1})
            return jresponse('-1', 'ServiceUnavailable', req,503)
        
        bytes_transferred = 0
        start_time=time.time()

        try:
            with ContextPool(len(nodes)) as pool:
                for conn in conns:
                    conn.failed = False
                    conn.queue = Queue(self.app.put_queue_depth)
                    pool.spawn(self._send_file, conn, req.path)
                while True:
                    with ChunkReadTimeout(self.app.client_timeout):
                        try:
                            chunk = next(data_source)
#.........这里部分代码省略.........

                # no worries, last_item is None
                pass
            except ListingIterNotAuthorized, err:
                return err.aresp
            except ListingIterError:
                return jresponse('-1','ServerERROR',req,500)
            if last_item:
                
                move_path = '/' + self.account_name + '/' + \
                            lcontainer + '/' + last_item['name']
                move_headers = {'Destination': '/' + self.container_name + '/' + self.object_name }
                
                creq = Request.blank(move_path, headers=move_headers)
                move_resp = self.MOVE_VERSION(creq)
                
                if is_client_error(move_resp.status_int):
                    return jresponse('-1', 'client error', req,412)
                elif not is_success(move_resp.status_int):
                    return jresponse('-1', 'ServiceUnavailable', req,503)
                
        return resp


    @public
    def COPY(self,req):    
        
        account_partition, accounts = self.account_info(self.account_name,autocreate=False)
        account = accounts[0]
        
        (container_partition, containers,_) = self.container_info(self.account_name, self.container_name,
                account_autocreate=self.app.account_autocreate)

    def DELETE(self, req):
        """HTTP DELETE request handler."""
        container_info = self.container_info(
            self.account_name, self.container_name, req)
        container_partition = container_info['partition']
        containers = container_info['nodes']
        req.acl = container_info['write_acl']
        req.environ['swift_sync_key'] = container_info['sync_key']
        object_versions = container_info['versions']
        if object_versions:
            # this is a version manifest and needs to be handled differently
            object_versions = unquote(object_versions)
            lcontainer = object_versions.split('/')[0]
            prefix_len = '%03x' % len(self.object_name)
            lprefix = prefix_len + self.object_name + '/'
            last_item = None
            try:
                for last_item in self._listing_iter(lcontainer, lprefix,
                                                    req.environ):
                    pass
            except ListingIterNotFound:
                # no worries, last_item is None
                pass
            except ListingIterNotAuthorized as err:
                return err.aresp
            except ListingIterError:
                return HTTPServerError(request=req)
            if last_item:
                # there are older versions so copy the previous version to the
                # current object and delete the previous version
                orig_container = self.container_name
                orig_obj = self.object_name
                self.container_name = lcontainer
                self.object_name = last_item['name'].encode('utf-8')
                copy_path = '/v1/' + self.account_name + '/' + \
                            self.container_name + '/' + self.object_name
                copy_headers = {'X-Newest': 'True',
                                'Destination': orig_container + '/' + orig_obj
                                }
                copy_environ = {'REQUEST_METHOD': 'COPY',
                                'swift_versioned_copy': True
                                }
                creq = Request.blank(copy_path, headers=copy_headers,
                                     environ=copy_environ)
                copy_resp = self.COPY(creq)
                if is_client_error(copy_resp.status_int):
                    # some user error, maybe permissions
                    return HTTPPreconditionFailed(request=req)
                elif not is_success(copy_resp.status_int):
                    # could not copy the data, bail
                    return HTTPServiceUnavailable(request=req)
                # reset these because the COPY changed them
                self.container_name = lcontainer
                self.object_name = last_item['name'].encode('utf-8')
                new_del_req = Request.blank(copy_path, environ=req.environ)
                container_info = self.container_info(
                    self.account_name, self.container_name, req)
                container_partition = container_info['partition']
                containers = container_info['nodes']
                new_del_req.acl = container_info['write_acl']
                new_del_req.path_info = copy_path
                req = new_del_req
                # remove 'X-If-Delete-At', since it is not for the older copy
                if 'X-If-Delete-At' in req.headers:
                    del req.headers['X-If-Delete-At']
        if 'swift.authorize' in req.environ:
            aresp = req.environ['swift.authorize'](req)
            if aresp:
                return aresp
        if not containers:
            return HTTPNotFound(request=req)
        partition, nodes = self.app.object_ring.get_nodes(
            self.account_name, self.container_name, self.object_name)
        # Used by container sync feature
        if 'x-timestamp' in req.headers:
            try:
                req.headers['X-Timestamp'] = \
                    normalize_timestamp(req.headers['x-timestamp'])
            except ValueError:
                return HTTPBadRequest(
                    request=req, content_type='text/plain',
                    body='X-Timestamp should be a UNIX timestamp float value; '
                         'was %r' % req.headers['x-timestamp'])
        else:
            req.headers['X-Timestamp'] = normalize_timestamp(time.time())

        headers = self._backend_requests(
            req, len(nodes), container_partition, containers)
        resp = self.make_requests(req, self.app.object_ring,
                                  partition, 'DELETE', req.swift_entity_path,
                                  headers)
        return resp

    def _handle_object_versions(self, req):
        """
        This method handles versionining of objects in containers that
        have the feature enabled.

        When a new PUT request is sent, the proxy checks for previous versions
        of that same object name. If found, it is copied to a different
        container and the new version is stored in its place.

        This method was added as part of the PUT method refactoring and the
        functionality is expected to be moved to middleware
        """
        container_info = self.container_info(
            self.account_name, self.container_name, req)
        policy_index = req.headers.get('X-Backend-Storage-Policy-Index',
                                       container_info['storage_policy'])
        obj_ring = self.app.get_object_ring(policy_index)
        partition, nodes = obj_ring.get_nodes(
            self.account_name, self.container_name, self.object_name)
        object_versions = container_info['versions']

        # do a HEAD request for checking object versions
        if object_versions and not req.environ.get('swift_versioned_copy'):
            # make sure proxy-server uses the right policy index
            _headers = {'X-Backend-Storage-Policy-Index': policy_index,
                        'X-Newest': 'True'}
            hreq = Request.blank(req.path_info, headers=_headers,
                                 environ={'REQUEST_METHOD': 'HEAD'})
            hresp = self.GETorHEAD_base(
                hreq, _('Object'), obj_ring, partition,
                hreq.swift_entity_path)

            is_manifest = 'X-Object-Manifest' in req.headers or \
                          'X-Object-Manifest' in hresp.headers
            if hresp.status_int != HTTP_NOT_FOUND and not is_manifest:
                # This is a version manifest and needs to be handled
                # differently. First copy the existing data to a new object,
                # then write the data from this request to the version manifest
                # object.
                lcontainer = object_versions.split('/')[0]
                prefix_len = '%03x' % len(self.object_name)
                lprefix = prefix_len + self.object_name + '/'
                ts_source = hresp.environ.get('swift_x_timestamp')
                if ts_source is None:
                    ts_source = time.mktime(time.strptime(
                                            hresp.headers['last-modified'],
                                            '%a, %d %b %Y %H:%M:%S GMT'))
                new_ts = Timestamp(ts_source).internal
                vers_obj_name = lprefix + new_ts
                copy_headers = {
                    'Destination': '%s/%s' % (lcontainer, vers_obj_name)}
                copy_environ = {'REQUEST_METHOD': 'COPY',
                                'swift_versioned_copy': True
                                }
                copy_req = Request.blank(req.path_info, headers=copy_headers,
                                         environ=copy_environ)
                copy_resp = self.COPY(copy_req)
                if is_client_error(copy_resp.status_int):
                    # missing container or bad permissions
                    raise HTTPPreconditionFailed(request=req)
                elif not is_success(copy_resp.status_int):
                    # could not copy the data, bail
                    raise HTTPServiceUnavailable(request=req)

    def PUT(self, req, start_time=None, stats_type="PUT"):
        """HTTP PUT request handler."""
        if not start_time:
            start_time = time.time()
        (
            container_partition,
            containers,
            _junk,
            req.acl,
            req.environ["swift_sync_key"],
            object_versions,
        ) = self.container_info(self.account_name, self.container_name, account_autocreate=self.app.account_autocreate)
        if "swift.authorize" in req.environ:
            aresp = req.environ["swift.authorize"](req)
            if aresp:
                self.app.logger.increment("auth_short_circuits")
                return aresp
        if not containers:
            self.app.logger.timing_since("%s.timing" % (stats_type,), start_time)
            return HTTPNotFound(request=req)
        if "x-delete-after" in req.headers:
            try:
                x_delete_after = int(req.headers["x-delete-after"])
            except ValueError:
                self.app.logger.increment("errors")
                return HTTPBadRequest(request=req, content_type="text/plain", body="Non-integer X-Delete-After")
            req.headers["x-delete-at"] = "%d" % (time.time() + x_delete_after)
        if &