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# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
import pytest
from unittest.mock import patch, call
from azure.appconfiguration.provider._discovery import (
_get_known_domain,
_request_record,
_find_replicas,
_find_origin,
find_auto_failover_endpoints,
)
from dns.resolver import NXDOMAIN, YXDOMAIN, LifetimeTimeout, NoNameservers # cspell:disable-line
AZCONFIG_IO = ".azconfig.io" # cspell:disable-line
APPCONFIG_IO = ".appconfig.io" # cspell:disable-line
class FakeAnswer:
def __init__(self, priority, weight, port, target):
self.priority = priority
self.weight = weight
self.port = port
self.target = target.rstrip(".")
@pytest.mark.usefixtures("caplog")
class TestDiscovery:
def test_get_known_domain(self):
fake_endpoint = "https://fake.endpoint"
assert _get_known_domain(fake_endpoint) is None
fake_endpoint = "https://fake.endpoint." + AZCONFIG_IO # cspell:disable-line
assert _get_known_domain(fake_endpoint) == AZCONFIG_IO # cspell:disable-line
fake_endpoint = "https://fake.endpoint" + AZCONFIG_IO + ".test" # cspell:disable-line
assert _get_known_domain(fake_endpoint) == AZCONFIG_IO + ".test" # cspell:disable-line
fake_endpoint = "https://fake.endpoint" + APPCONFIG_IO
assert _get_known_domain(fake_endpoint) == APPCONFIG_IO
@patch("azure.appconfiguration.provider._discovery.dns.resolver.resolve")
def test_request_record(self, mock_dns):
origin_request = "_origin._tcp.fake.endpoint"
mock_dns.return_value = []
assert len(_request_record(origin_request)) == 0
mock_dns.return_value = [1, 2, 3]
assert len(_request_record(origin_request)) == 3
mock_dns.side_effect = NXDOMAIN # cspell:disable-line
assert len(_request_record(origin_request)) == 0
mock_dns.side_effect = YXDOMAIN # cspell:disable-line
assert len(_request_record(origin_request)) == 0
mock_dns.side_effect = LifetimeTimeout
assert not _request_record(origin_request)
mock_dns.side_effect = NoNameservers
assert not _request_record(origin_request)
@patch("azure.appconfiguration.provider._discovery._request_record")
def test_find_replicas(self, mock_request_record):
origin = "fake.endpoint"
mock_request_record.return_value = None
assert not _find_replicas(origin)
mock_request_record.assert_called_once_with("_alt0._tcp.fake.endpoint")
mock_request_record.reset_mock()
mock_request_record.return_value = []
assert len(_find_replicas(origin)) == 0
mock_request_record.assert_called_once_with("_alt0._tcp.fake.endpoint")
mock_request_record.reset_mock()
mock_request_record.side_effect = [[FakeAnswer(1, 99, 5000, "fake.endpoint.")], []]
result = _find_replicas(origin)
assert len(result) == 1
assert result[0].priority == 1
assert result[0].weight == 99
assert result[0].port == 5000
assert result[0].target == "fake.endpoint"
assert mock_request_record.call_count == 2
mock_request_record.assert_has_calls([call("_alt0._tcp.fake.endpoint"), call("_alt1._tcp.fake.endpoint")])
mock_request_record.reset_mock()
mock_request_record.side_effect = [
[FakeAnswer(1, 99, 5000, "fake.endpoint."), FakeAnswer(2, 98, 5001, "fake.endpoint.")],
[],
]
result = _find_replicas(origin)
assert len(result) == 2
assert mock_request_record.call_count == 2
mock_request_record.assert_has_calls([call("_alt0._tcp.fake.endpoint"), call("_alt1._tcp.fake.endpoint")])
mock_request_record.reset_mock()
mock_request_record.side_effect = [
[FakeAnswer(1, 99, 5000, "fake.endpoint."), FakeAnswer(2, 98, 5001, "fake.endpoint.")],
[FakeAnswer(3, 99, 5000, "fake.endpoint.")],
[],
]
result = _find_replicas(origin)
assert len(result) == 3
assert mock_request_record.call_count == 3
mock_request_record.assert_has_calls(
[call("_alt0._tcp.fake.endpoint"), call("_alt1._tcp.fake.endpoint"), call("_alt2._tcp.fake.endpoint")]
)
@patch("azure.appconfiguration.provider._discovery._request_record")
def test_find_origin(self, mock_request_record):
endpoint = "https://fake.endpoint"
mock_request_record.return_value = None
assert not _find_origin(endpoint)
mock_request_record.assert_called_once_with("_origin._tcp.fake.endpoint")
mock_request_record.reset_mock()
mock_request_record.return_value = []
assert not _find_origin(endpoint)
mock_request_record.assert_called_once_with("_origin._tcp.fake.endpoint")
mock_request_record.reset_mock()
mock_request_record.return_value = [FakeAnswer(1, 99, 5000, "fake.endpoint.")]
result = _find_origin(endpoint)
assert result.priority == 1
assert result.weight == 99
assert result.port == 5000
assert result.target == "fake.endpoint"
mock_request_record.assert_called_once_with("_origin._tcp.fake.endpoint")
mock_request_record.reset_mock()
mock_request_record.return_value = [
FakeAnswer(1, 99, 5000, "fake.endpoint1."),
FakeAnswer(2, 98, 5001, "fake.endpoint2."),
]
result = _find_origin(endpoint)
assert result.priority == 1
assert result.weight == 99
assert result.port == 5000
assert result.target == "fake.endpoint1"
mock_request_record.assert_called_once_with("_origin._tcp.fake.endpoint")
@patch("azure.appconfiguration.provider._discovery._find_origin")
@patch("azure.appconfiguration.provider._discovery._find_replicas")
def test_find_auto_failover_endpoints(self, mock_find_replicas, mock_find_origin):
endpoint = "https://fake.appconfig.io"
assert len(find_auto_failover_endpoints(endpoint, False)) == 0
mock_find_origin.assert_not_called()
mock_find_replicas.assert_not_called()
mock_find_origin.reset_mock()
mock_find_replicas.reset_mock()
assert len(find_auto_failover_endpoints("bad.endpoint", True)) == 0
mock_find_origin.assert_not_called()
mock_find_replicas.assert_not_called()
mock_find_origin.reset_mock()
mock_find_replicas.reset_mock()
mock_find_origin.return_value = FakeAnswer(1, 99, 5000, "fake.appconfig.io")
mock_find_replicas.return_value = []
assert not find_auto_failover_endpoints(endpoint, True)
mock_find_origin.reset_mock()
mock_find_replicas.reset_mock()
mock_find_origin.return_value = FakeAnswer(1, 99, 5000, "fake.appconfig.io")
mock_find_replicas.return_value = [FakeAnswer(2, 98, 5001, "fake1.appconfig.io.")]
result = find_auto_failover_endpoints(endpoint, True)
assert len(result) == 1
assert result[0] == "https://fake1.appconfig.io"
mock_find_origin.assert_called_once_with(endpoint)
mock_find_replicas.assert_called_once_with("fake.appconfig.io")
mock_find_origin.reset_mock()
mock_find_replicas.reset_mock()
mock_find_origin.return_value = FakeAnswer(1, 99, 5000, "fake.appconfig.io")
mock_find_replicas.return_value = [
FakeAnswer(2, 98, 5001, "fake1.appconfig.io."),
FakeAnswer(3, 97, 5002, "fake2.appconfig.io."),
]
result = find_auto_failover_endpoints(endpoint, True)
assert len(result) == 2
assert result[0] == "https://fake1.appconfig.io"
assert result[1] == "https://fake2.appconfig.io"
mock_find_origin.assert_called_once_with(endpoint)
mock_find_replicas.assert_called_once_with("fake.appconfig.io")
mock_find_origin.reset_mock()
mock_find_replicas.reset_mock()
mock_find_origin.return_value = FakeAnswer(1, 99, 5000, "fake.appconfig.io")
mock_find_replicas.return_value = [
FakeAnswer(2, 98, 5001, "fake1.appconfig.io."),
FakeAnswer(3, 97, 5002, "fake2.appconfig.io."),
]
result = find_auto_failover_endpoints("https://fake1.appconfig.io", True)
assert len(result) == 2
assert result[0] == "https://fake.appconfig.io"
assert result[1] == "https://fake2.appconfig.io"
mock_find_origin.assert_called_once_with("https://fake1.appconfig.io")
mock_find_replicas.assert_called_once_with("fake.appconfig.io")
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