def _List(requests, http, batch_url, errors):
"""Makes a series of list and/or aggregatedList batch requests.
Args:
requests: A list of requests to make. Each element must be a 3-element
tuple where the first element is the service, the second element is
the method ('List' or 'AggregatedList'), and the third element
is a protocol buffer representing either a list or aggregatedList
request.
http: An httplib2.Http-like object.
batch_url: The handler for making batch requests.
errors: A list for capturing errors. If any response contains an error,
it is added to this list.
Yields:
Resources encapsulated as protocol buffers as they are received
from the server.
"""
while requests:
responses, request_errors = batch_helper.MakeRequests(
requests=requests,
http=http,
batch_url=batch_url)
errors.extend(request_errors)
new_requests = []
for i, response in enumerate(responses):
if not response:
continue
service, method, request_protobuf = requests[i]
# If the request is a list call, then yield the items directly.
if method == 'List':
for item in response.items:
yield item
# If the request is an aggregatedList call, then do all the
# magic necessary to get the actual resources because the
# aggregatedList responses are very complicated data
# structures...
else:
items_field_name = service.GetMethodConfig(
'AggregatedList').relative_path.split('/')[-1]
for scope_result in response.items.additionalProperties:
# If the given scope is unreachable, record the warning
# message in the errors list.
warning = scope_result.value.warning
if (warning and
warning.code == warning.CodeValueValuesEnum.UNREACHABLE):
errors.append((None, warning.message))
items = getattr(scope_result.value, items_field_name)
for item in items:
yield item
next_page_token = response.nextPageToken
if next_page_token:
new_request_protobuf = copy.deepcopy(request_protobuf)
new_request_protobuf.pageToken = next_page_token
new_requests.append((service, method, new_request_protobuf))
requests = new_requests
def MakeRequests(requests, http, batch_url, errors, custom_get_requests=None):
"""Makes one or more requests to the API.
Each request can be either a synchronous API call or an asynchronous
one. For synchronous calls (e.g., get and list), the result from the
server is yielded immediately. For asynchronous calls (e.g., calls
that return operations like insert), this function waits until the
operation reaches the DONE state and fetches the corresponding
object and yields that object (nothing is yielded for deletions).
Currently, a heterogenous set of synchronous calls can be made
(e.g., get request to fetch a disk and instance), however, the
asynchronous requests must be homogenous (e.g., they must all be the
same verb on the same collection). In the future, heterogenous
asynchronous requests will be supported. For now, it is up to the
client to ensure that the asynchronous requests are
homogenous. Synchronous and asynchronous requests can be mixed.
Args:
requests: A list of requests to make. Each element must be a 3-element
tuple where the first element is the service, the second element is
the string name of the method on the service, and the last element
is a protocol buffer representing the request.
http: An httplib2.Http-like object.
batch_url: The handler for making batch requests.
errors: A list for capturing errors. If any response contains an error,
it is added to this list.
custom_get_requests: A mapping of resource names to requests. If
this is provided, when an operation is DONE, instead of performing
a get on the targetLink, this function will consult custom_get_requests
and perform the request dictated by custom_get_requests.
Yields:
A response for each request. For deletion requests, no corresponding
responses are returned.
"""
if _RequestsAreListRequests(requests):
for item in _List(
requests=requests, http=http, batch_url=batch_url, errors=errors):
yield item
return
responses, new_errors = batch_helper.MakeRequests(
requests=requests, http=http, batch_url=batch_url)
errors.extend(new_errors)
operation_service = None
resource_service = None
project = None
# Collects all operation objects in a list so they can be waited on
# and yields all non-operation objects since non-operation responses
# cannot be waited on.
operations = []
for request, response in zip(requests, responses):
if response is None:
continue
service, _, request_body = request
if (isinstance(response, service.client.MESSAGES_MODULE.Operation) and
service.__class__.__name__ not in (
'GlobalOperationsService',
'RegionOperationsService',
'ZoneOperationsService')):
operations.append(response)
if not operation_service:
resource_service = service
project = request_body.project
if response.zone:
operation_service = service.client.zoneOperations
elif response.region:
operation_service = service.client.regionOperations
else:
operation_service = service.client.globalOperations
else:
yield response
if operations:
warnings = []
for response in waiters.WaitForOperations(
operations=operations,
project=project,
operation_service=operation_service,
resource_service=resource_service,
http=http,
batch_url=batch_url,
custom_get_requests=custom_get_requests,
warnings=warnings or [],
errors=errors):
yield response
if warnings:
log.warn(utils.ConstructList('Some requests generated warnings:',
warnings))
def WaitForOperations(operations,
project,
operation_service,
resource_service,
http,
batch_url,
warnings,
errors,
custom_get_requests=None,
timeout=None):
"""Blocks until the given operations are done or until a timeout is reached.
Args:
operations: A list of Operation objects to poll.
project: The project to which the resources belog.
operation_service: The service that can be used to get operation
objects.
resource_service: The service of the collection being mutated by
the operations. If the operation type is not delete, this service
is used to fetch the mutated objects after the operations are done.
http: An HTTP object.
batch_url: The URL to which batch requests should be sent.
warnings: An output parameter for capturing warnings.
errors: An output parameter for capturing errors.
custom_get_requests: A mapping of resource names to requests. If
this is provided, when an operation is DONE, instead of performing
a get on the targetLink, this function will consult custom_get_requests
and perform the request dictated by custom_get_requests.
timeout: The maximum amount of time, in seconds, to wait for the
operations to reach the DONE state.
Yields:
The resources pointed to by the operations' targetLink fields if
the operation type is not delete. Only resources whose
corresponding operations reach done are yielded.
"""
timeout = timeout or _POLLING_TIMEOUT_SEC
operation_type = operation_service.GetResponseType('Get')
responses = []
start = time_utils.CurrentTimeSec()
sleep_sec = 0
while operations:
resource_requests = []
operation_requests = []
log.debug('Operations to inspect: %s', operations)
for operation in operations:
if operation.status == operation_type.StatusValueValuesEnum.DONE:
# The operation has reached the DONE state, so we record any
# problems it contains (if any) and proceed to get the target
# resource if there were no problems and the operation is not
# a deletion.
_RecordProblems(operation, warnings, errors)
# We shouldn't attempt to get the target resource if there was
# anything wrong with the operation. Note that
# httpErrorStatusCode is set only when the operation is not
# successful.
if (operation.httpErrorStatusCode
and operation.httpErrorStatusCode != httplib.OK):
continue
# Just in case the server did not set httpErrorStatusCode but
# the operation did fail, we check the "error" field.
if operation.error:
continue
target_link = operation.targetLink
if custom_get_requests:
target_link, service, request_protobuf = (
custom_get_requests[operation.targetLink])
resource_requests.append(
(service, 'Get', request_protobuf))
# We shouldn't get the target resource if the operation type
# is delete because there will be no resource left.
elif operation.operationType != 'delete':
request = resource_service.GetRequestType('Get')(
project=project)
if operation.zone:
request.zone = path_simplifier.Name(operation.zone)
elif operation.region:
request.region = path_simplifier.Name(operation.region)
name_field = resource_service.GetMethodConfig(
'Get').ordered_params[-1]
setattr(request, name_field,
path_simplifier.Name(operation.targetLink))
resource_requests.append(
(resource_service, 'Get', request))
log.status.write('{0} [{1}].\n'.format(
_HUMAN_FRIENDLY_OPERATION_TYPES.get(
operation.operationType, 'Updated'), target_link))
else:
# The operation has not reached the DONE state, so we add a
# get request to poll the operation.
request = operation_service.GetRequestType('Get')(
operation=operation.name, project=project)
if operation.zone:
request.zone = path_simplifier.Name(operation.zone)
elif operation.region:
request.region = path_simplifier.Name(operation.region)
operation_requests.append((operation_service, 'Get', request))
requests = resource_requests + operation_requests
if not requests:
break
responses, request_errors = batch_helper.MakeRequests(
requests=requests, http=http, batch_url=batch_url)
errors.extend(request_errors)
operations = []
for response in responses:
if isinstance(response, operation_type):
operations.append(response)
else:
yield response
# If there are no more operations, we are done.
if not operations:
break
# Did we time out? If so, record the operations that timed out so
# they can be reported to the user.
if time_utils.CurrentTimeSec() - start > timeout:
log.debug('Timeout of %ss reached.', timeout)
_RecordUnfinishedOperations(operations, errors)
break
# Sleeps before trying to poll the operations again.
sleep_sec += 1
log.debug('Sleeping for %ss.', sleep_sec)
time_utils.Sleep(min(sleep_sec, _MAX_TIME_BETWEEN_POLLS_SEC))