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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
"""Tests for the retry policy."""
try:
from io import BytesIO
except ImportError:
from cStringIO import StringIO as BytesIO
import pytest
from itertools import product
from azure.core.configuration import ConnectionConfiguration
from azure.core.exceptions import (
AzureError,
ServiceRequestError,
ServiceRequestTimeoutError,
ServiceResponseError,
ServiceResponseTimeoutError,
)
from azure.core.pipeline.policies import (
RetryPolicy,
RetryMode,
)
from azure.core.pipeline import Pipeline, PipelineResponse
from azure.core.pipeline.transport import (
HttpTransport,
)
import tempfile
import os
import time
try:
from unittest.mock import Mock
except ImportError:
from mock import Mock
from utils import HTTP_REQUESTS, request_and_responses_product, HTTP_RESPONSES, create_http_response
def test_retry_code_class_variables():
retry_policy = RetryPolicy()
assert retry_policy._RETRY_CODES is not None
assert 408 in retry_policy._RETRY_CODES
assert 429 in retry_policy._RETRY_CODES
assert 501 not in retry_policy._RETRY_CODES
def test_retry_types():
history = ["1", "2", "3"]
settings = {"history": history, "backoff": 1, "max_backoff": 10}
retry_policy = RetryPolicy()
backoff_time = retry_policy.get_backoff_time(settings)
assert backoff_time == 4
retry_policy = RetryPolicy(retry_mode=RetryMode.Fixed)
backoff_time = retry_policy.get_backoff_time(settings)
assert backoff_time == 1
retry_policy = RetryPolicy(retry_mode=RetryMode.Exponential)
backoff_time = retry_policy.get_backoff_time(settings)
assert backoff_time == 4
@pytest.mark.parametrize(
"retry_after_input,http_request,http_response",
product(["0", "800", "1000", "1200", "0.9"], HTTP_REQUESTS, HTTP_RESPONSES),
)
def test_retry_after(retry_after_input, http_request, http_response):
retry_policy = RetryPolicy()
request = http_request("GET", "http://localhost")
response = create_http_response(http_response, request, None)
response.headers["retry-after-ms"] = retry_after_input
pipeline_response = PipelineResponse(request, response, None)
retry_after = retry_policy.get_retry_after(pipeline_response)
seconds = float(retry_after_input)
assert retry_after == seconds / 1000.0
response.headers.pop("retry-after-ms")
response.headers["Retry-After"] = retry_after_input
retry_after = retry_policy.get_retry_after(pipeline_response)
assert retry_after == float(retry_after_input)
response.headers["retry-after-ms"] = 500
retry_after = retry_policy.get_retry_after(pipeline_response)
assert retry_after == float(retry_after_input)
@pytest.mark.parametrize(
"retry_after_input,http_request,http_response",
product(["0", "800", "1000", "1200", "0.9"], HTTP_REQUESTS, HTTP_RESPONSES),
)
def test_x_ms_retry_after(retry_after_input, http_request, http_response):
retry_policy = RetryPolicy()
request = http_request("GET", "http://localhost")
response = create_http_response(http_response, request, None)
response.headers["x-ms-retry-after-ms"] = retry_after_input
pipeline_response = PipelineResponse(request, response, None)
retry_after = retry_policy.get_retry_after(pipeline_response)
seconds = float(retry_after_input)
assert retry_after == seconds / 1000.0
response.headers.pop("x-ms-retry-after-ms")
response.headers["Retry-After"] = retry_after_input
retry_after = retry_policy.get_retry_after(pipeline_response)
assert retry_after == float(retry_after_input)
response.headers["x-ms-retry-after-ms"] = 500
retry_after = retry_policy.get_retry_after(pipeline_response)
assert retry_after == float(retry_after_input)
@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_retry_on_429(http_request, http_response):
class MockTransport(HttpTransport):
def __init__(self):
self._count = 0
def __exit__(self, exc_type, exc_val, exc_tb):
pass
def close(self):
pass
def open(self):
pass
def send(self, request, **kwargs): # type: (PipelineRequest, Any) -> PipelineResponse
self._count += 1
response = create_http_response(http_response, request, None)
response.status_code = 429
return response
http_request = http_request("GET", "http://localhost/")
http_retry = RetryPolicy(retry_total=1)
transport = MockTransport()
pipeline = Pipeline(transport, [http_retry])
pipeline.run(http_request)
assert transport._count == 2
@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_no_retry_on_201(http_request, http_response):
class MockTransport(HttpTransport):
def __init__(self):
self._count = 0
def __exit__(self, exc_type, exc_val, exc_tb):
pass
def close(self):
pass
def open(self):
pass
def send(self, request, **kwargs): # type: (PipelineRequest, Any) -> PipelineResponse
self._count += 1
response = create_http_response(http_response, request, None)
response.status_code = 201
headers = {"Retry-After": "1"}
response.headers = headers
return response
http_request = http_request("GET", "http://localhost/")
http_retry = RetryPolicy(retry_total=1)
transport = MockTransport()
pipeline = Pipeline(transport, [http_retry])
pipeline.run(http_request)
assert transport._count == 1
@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_retry_seekable_stream(http_request, http_response):
class MockTransport(HttpTransport):
def __init__(self):
self._first = True
def __exit__(self, exc_type, exc_val, exc_tb):
pass
def close(self):
pass
def open(self):
pass
def send(self, request, **kwargs): # type: (PipelineRequest, Any) -> PipelineResponse
if self._first:
self._first = False
request.body.seek(0, 2)
raise AzureError("fail on first")
position = request.body.tell()
assert position == 0
response = create_http_response(http_response, request, None)
response.status_code = 400
return response
data = BytesIO(b"Lots of dataaaa")
http_request = http_request("GET", "http://localhost/")
http_request.set_streamed_data_body(data)
http_retry = RetryPolicy(retry_total=1)
pipeline = Pipeline(MockTransport(), [http_retry])
pipeline.run(http_request)
@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_retry_seekable_file(http_request, http_response):
class MockTransport(HttpTransport):
def __init__(self):
self._first = True
def __exit__(self, exc_type, exc_val, exc_tb):
pass
def close(self):
pass
def open(self):
pass
def send(self, request, **kwargs): # type: (PipelineRequest, Any) -> PipelineResponse
if self._first:
self._first = False
for value in request.files.values():
name, body = value[0], value[1]
if name and body and hasattr(body, "read"):
body.seek(0, 2)
raise AzureError("fail on first")
for value in request.files.values():
name, body = value[0], value[1]
if name and body and hasattr(body, "read"):
position = body.tell()
assert not position
response = create_http_response(http_response, request, None)
response.status_code = 400
return response
file = tempfile.NamedTemporaryFile(delete=False)
file.write(b"Lots of dataaaa")
file.close()
http_request = http_request("GET", "http://localhost/")
headers = {"Content-Type": "multipart/form-data"}
http_request.headers = headers
with open(file.name, "rb") as f:
form_data_content = {
"fileContent": f,
"fileName": f.name,
}
http_request.set_formdata_body(form_data_content)
http_retry = RetryPolicy(retry_total=1)
pipeline = Pipeline(MockTransport(), [http_retry])
pipeline.run(http_request)
os.unlink(f.name)
@pytest.mark.parametrize("http_request", HTTP_REQUESTS)
def test_retry_timeout(http_request):
timeout = 1
def send(request, **kwargs):
assert kwargs["connection_timeout"] <= timeout, "policy should set connection_timeout not to exceed timeout"
raise ServiceResponseError("oops")
transport = Mock(
spec=HttpTransport,
send=Mock(wraps=send),
connection_config=ConnectionConfiguration(connection_timeout=timeout * 2),
sleep=time.sleep,
)
pipeline = Pipeline(transport, [RetryPolicy(timeout=timeout)])
with pytest.raises(ServiceResponseTimeoutError):
response = pipeline.run(http_request("GET", "http://localhost/"))
@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_timeout_defaults(http_request, http_response):
"""When "timeout" is not set, the policy should not override the transport's timeout configuration"""
def send(request, **kwargs):
for arg in ("connection_timeout", "read_timeout"):
assert arg not in kwargs, "policy should defer to transport configuration when not given a timeout"
response = create_http_response(http_response, request, None)
response.status_code = 200
return response
transport = Mock(
spec_set=HttpTransport,
send=Mock(wraps=send),
sleep=Mock(side_effect=Exception("policy should not sleep: its first send succeeded")),
)
pipeline = Pipeline(transport, [RetryPolicy()])
pipeline.run(http_request("GET", "http://localhost/"))
assert transport.send.call_count == 1, "policy should not retry: its first send succeeded"
combinations = [(ServiceRequestError, ServiceRequestTimeoutError), (ServiceResponseError, ServiceResponseTimeoutError)]
@pytest.mark.parametrize(
"combinations,http_request",
product(combinations, HTTP_REQUESTS),
)
def test_does_not_sleep_after_timeout(combinations, http_request):
# With default settings policy will sleep twice before exhausting its retries: 1.6s, 3.2s.
# It should not sleep the second time when given timeout=1
transport_error, expected_timeout_error = combinations
timeout = 1
transport = Mock(
spec=HttpTransport,
send=Mock(side_effect=transport_error("oops")),
sleep=Mock(wraps=time.sleep),
)
pipeline = Pipeline(transport, [RetryPolicy(timeout=timeout)])
with pytest.raises(expected_timeout_error):
pipeline.run(http_request("GET", "http://localhost/"))
assert transport.sleep.call_count == 1
|
