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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 azure.core.exceptions import AzureError, ServiceResponseError, ServiceResponseTimeoutError
from azure.core.pipeline.policies import (
RetryPolicy,
RetryMode,
)
from azure.core.pipeline import Pipeline, PipelineResponse
from azure.core.pipeline.transport import (
HttpRequest,
HttpResponse,
HttpTransport,
)
import tempfile
import os
import time
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", [('0'), ('800'), ('1000'), ('1200')])
def test_retry_after(retry_after_input):
retry_policy = RetryPolicy()
request = HttpRequest("GET", "https://bing.com")
response = HttpResponse(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", [('0'), ('800'), ('1000'), ('1200')])
def test_x_ms_retry_after(retry_after_input):
retry_policy = RetryPolicy()
request = HttpRequest("GET", "https://bing.com")
response = HttpResponse(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)
def test_retry_on_429():
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 = HttpResponse(request, None)
response.status_code = 429
return response
http_request = HttpRequest('GET', 'http://127.0.0.1/')
http_retry = RetryPolicy(retry_total = 1)
transport = MockTransport()
pipeline = Pipeline(transport, [http_retry])
pipeline.run(http_request)
assert transport._count == 2
def test_no_retry_on_201():
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 = HttpResponse(request, None)
response.status_code = 201
headers = {"Retry-After": "1"}
response.headers = headers
return response
http_request = HttpRequest('GET', 'http://127.0.0.1/')
http_retry = RetryPolicy(retry_total = 1)
transport = MockTransport()
pipeline = Pipeline(transport, [http_retry])
pipeline.run(http_request)
assert transport._count == 1
def test_retry_seekable_stream():
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 = HttpResponse(request, None)
response.status_code = 400
return response
data = BytesIO(b"Lots of dataaaa")
http_request = HttpRequest('GET', 'http://127.0.0.1/')
http_request.set_streamed_data_body(data)
http_retry = RetryPolicy(retry_total = 1)
pipeline = Pipeline(MockTransport(), [http_retry])
pipeline.run(http_request)
def test_retry_seekable_file():
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 = HttpResponse(request, None)
response.status_code = 400
return response
file = tempfile.NamedTemporaryFile(delete=False)
file.write(b'Lots of dataaaa')
file.close()
http_request = HttpRequest('GET', 'http://127.0.0.1/')
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)
def test_retry_timeout():
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
if self.count > 2:
assert self.count <= 2
time.sleep(0.5)
raise ServiceResponseError('timeout')
http_request = HttpRequest('GET', 'http://127.0.0.1/')
headers = {'Content-Type': "multipart/form-data"}
http_request.headers = headers
http_retry = RetryPolicy(retry_total=10, timeout=1)
pipeline = Pipeline(MockTransport(), [http_retry])
with pytest.raises(ServiceResponseTimeoutError):
pipeline.run(http_request)
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