def test_retry_idempotent(identity):
# Define our error and OK responses.
err409 = exceptions.Aborted(message='derp de derp')
err503 = exceptions.ServiceUnavailable(message='whups')
errwtf = exceptions.Unknown(message='huh?')
ok = showcase_v1alpha3.User(name='users/0', display_name='Guido')
server = mock.Mock(side_effect=(err409, err503, errwtf, ok))
# Mock the transport to send back the error responses followed by a
# success response.
transport = type(identity).get_transport_class()
with mock.patch.object(
transport,
'get_user',
new_callable=mock.PropertyMock(return_value=server)):
with mock.patch.object(time, 'sleep'):
response = identity.get_user({'name': 'users/0'})
assert response.name == 'users/0'
assert response.display_name == 'Guido'
assert server.call_count == 4
def _open(
self,
initial_request: gapic_types.AppendRowsRequest,
timeout: float = _DEFAULT_TIMEOUT,
) -> "AppendRowsFuture":
"""Open an append rows stream.
This is automatically called by the first call to the
:attr:`google.cloud.bigquery_storage_v1beta2.writer.AppendRowsStream.send`
method.
Args:
initial_request:
The initial request to start the stream. Must have
:attr:`google.cloud.bigquery_storage_v1beta2.types.AppendRowsRequest.write_stream`
and ``proto_rows.writer_schema.proto_descriptor`` and
properties populated.
timeout:
How long (in seconds) to wait for the stream to be ready.
Returns:
A future, which can be used to process the response to the initial
request when it arrives.
"""
if self.is_active:
raise ValueError("This manager is already open.")
if self._closed:
raise bqstorage_exceptions.StreamClosedError(
"This manager has been closed and can not be re-used.")
start_time = time.monotonic()
request = gapic_types.AppendRowsRequest()
gapic_types.AppendRowsRequest.copy_from(request,
self._inital_request_template)
request._pb.MergeFrom(initial_request._pb)
self._stream_name = request.write_stream
inital_response_future = AppendRowsFuture(self)
self._futures_queue.put(inital_response_future)
self._rpc = bidi.BidiRpc(
self._client.append_rows,
initial_request=request,
# TODO: pass in retry and timeout. Blocked by
# https://github.com/googleapis/python-api-core/issues/262
metadata=tuple(
itertools.chain(
self._metadata,
# This header is required so that the BigQuery Storage API
# knows which region to route the request to.
(
("x-goog-request-params",
f"write_stream={self._stream_name}"), ),
)),
)
self._rpc.add_done_callback(self._on_rpc_done)
self._consumer = bidi.BackgroundConsumer(self._rpc, self._on_response)
self._consumer.start()
# Make sure RPC has started before returning.
# Without this, consumers may get:
#
# ValueError: Can not send() on an RPC that has never been open()ed.
#
# when they try to send a request.
while not self._rpc.is_active and self._consumer.is_active:
# Avoid 100% CPU while waiting for RPC to be ready.
time.sleep(_WRITE_OPEN_INTERVAL)
# TODO: Check retry.deadline instead of (per-request) timeout.
# Blocked by
# https://github.com/googleapis/python-api-core/issues/262
if timeout is None:
continue
current_time = time.monotonic()
if current_time - start_time > timeout:
break
# Something went wrong when opening the RPC.
if not self._consumer.is_active:
# TODO: Share the exception from _rpc.open(). Blocked by
# https://github.com/googleapis/python-api-core/issues/268
request_exception = exceptions.Unknown(
"There was a problem opening the stream. "
"Try turning on DEBUG level logs to see the error.")
self.close(reason=request_exception)
raise request_exception
return inital_response_future
def test_unknown(core_retry):
error = core_exceptions.Unknown("testing")
core_retry.if_transient_error.return_value = False
assert _retry.is_transient_error(error) is True
core_retry.if_transient_error.assert_called_once_with(error)