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escalate plugin: handle origin not reachable
Update the escalate plugin to handle dispatching to the failover server if the original server is down. This also adds a new autest for the escalate plugin. Fixes: apache#11836
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| @@ -0,0 +1,130 @@ | ||
| ''' | ||
| ''' | ||
| # Licensed to the Apache Software Foundation (ASF) under one | ||
| # or more contributor license agreements. See the NOTICE file | ||
| # distributed with this work for additional information | ||
| # regarding copyright ownership. The ASF licenses this file | ||
| # to you under the Apache License, Version 2.0 (the | ||
| # "License"); you may not use this file except in compliance | ||
| # with the License. You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
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| import os | ||
| from ports import get_port | ||
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| Test.Summary = ''' | ||
| Test the escalate plugin. | ||
| ''' | ||
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| Test.SkipUnless(Condition.PluginExists('escalate.so')) | ||
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| class EscalateTest: | ||
| """ | ||
| Test the escalate plugin. | ||
| """ | ||
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| _replay_original_file: str = 'escalate_original.replay.yaml' | ||
| _replay_failover_file: str = 'escalate_failover.replay.yaml' | ||
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| def __init__(self): | ||
| '''Configure the test run.''' | ||
| tr = Test.AddTestRun('Test escalate plugin.') | ||
| self._setup_dns(tr) | ||
| self._setup_servers(tr) | ||
| self._setup_ts(tr) | ||
| self._setup_client(tr) | ||
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| def _setup_dns(self, tr: 'Process') -> None: | ||
| '''Set up the DNS server. | ||
| :param tr: The test run to add the DNS server to. | ||
| ''' | ||
| self._dns = tr.MakeDNServer(f"dns", default='127.0.0.1') | ||
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| def _setup_servers(self, tr: 'Process') -> None: | ||
| '''Set up the origin and failover servers. | ||
| :param tr: The test run to add the servers to. | ||
| ''' | ||
| tr.Setup.Copy(self._replay_original_file) | ||
| tr.Setup.Copy(self._replay_failover_file) | ||
| self._server_origin = tr.AddVerifierServerProcess(f"server_origin", self._replay_original_file) | ||
| self._server_failover = tr.AddVerifierServerProcess(f"server_failover", self._replay_failover_file) | ||
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| self._server_origin.Streams.All += Testers.ContainsExpression( | ||
| 'uuid: GET', "Verify the origin server received the GET request.") | ||
| self._server_origin.Streams.All += Testers.ContainsExpression( | ||
| 'uuid: GET_chunked', "Verify the origin server GET request for chunked content.") | ||
| self._server_origin.Streams.All += Testers.ContainsExpression( | ||
| 'uuid: GET_failed', "Verify the origin server received the GET request that it returns a 502 with.") | ||
| self._server_origin.Streams.All += Testers.ExcludesExpression( | ||
| 'uuid: GET_down_origin', "Verify the origin server did not receive the down origin request.") | ||
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| self._server_failover.Streams.All += Testers.ContainsExpression( | ||
| 'uuid: GET_failed', "Verify the failover server received the failed GET request.") | ||
| self._server_failover.Streams.All += Testers.ContainsExpression( | ||
| 'uuid: GET_down_origin', "Verify the failover server received the GET request for the down origin.") | ||
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| self._server_failover.Streams.All += Testers.ExcludesExpression( | ||
| 'x-request: first', "Verify the failover server did not receive the GET request.") | ||
| self._server_failover.Streams.All += Testers.ExcludesExpression( | ||
| 'uuid: GET_chunked', "Verify the failover server did not receive the GET request for chunked content.") | ||
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| def _setup_ts(self, tr: 'Process') -> None: | ||
| '''Set up Traffic Server. | ||
| :param tr: The test run to add Traffic Server to. | ||
| ''' | ||
| self._ts = tr.MakeATSProcess(f"ts", enable_cache=False) | ||
| # Select a port that is guaranteed to not be used at the moment. | ||
| dead_port = get_port(self._ts, "dead_port") | ||
| self._ts.Disk.records_config.update( | ||
| { | ||
| 'proxy.config.diags.debug.enabled': 1, | ||
| 'proxy.config.diags.debug.tags': 'http|escalate', | ||
| 'proxy.config.dns.nameservers': f'127.0.0.1:{self._dns.Variables.Port}', | ||
| 'proxy.config.dns.resolv_conf': 'NULL', | ||
| 'proxy.config.http.redirect.actions': 'self:follow', | ||
| 'proxy.config.http.number_of_redirections': 4, | ||
| }) | ||
| self._ts.Disk.remap_config.AddLines( | ||
| [ | ||
| f'map http://origin.server.com http://backend.origin.server.com:{self._server_origin.Variables.http_port} ' | ||
| f'@plugin=escalate.so @pparam=500,502:failover.server.com:{self._server_failover.Variables.http_port}', | ||
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| # Now create remap entries for the multiplexed hosts: one that | ||
| # verifies HTTP, and another that verifies HTTPS. | ||
| f'map http://down_origin.server.com http://backend.down_origin.server.com:{dead_port} ' | ||
| f'@plugin=escalate.so @pparam=500,502:failover.server.com:{self._server_failover.Variables.http_port} ', | ||
| ]) | ||
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| def _setup_client(self, tr: 'Process') -> None: | ||
| '''Set up the client. | ||
| :param tr: The test run to add the client to. | ||
| ''' | ||
| client = tr.AddVerifierClientProcess(f"client", self._replay_original_file, http_ports=[self._ts.Variables.port]) | ||
| client.StartBefore(self._dns) | ||
| client.StartBefore(self._server_origin) | ||
| client.StartBefore(self._server_failover) | ||
| client.StartBefore(self._ts) | ||
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| client.Streams.All += Testers.ExcludesExpression(r'\[ERROR\]', 'Verify there were no errors in the replay.') | ||
| client.Streams.All += Testers.ExcludesExpression('400 Bad', 'Verify none of the 400 responses make it to the client.') | ||
| client.Streams.All += Testers.ExcludesExpression('502 Bad', 'Verify none of the 502 responses make it to the client.') | ||
| client.Streams.All += Testers.ExcludesExpression('500 Internal', 'Verify none of the 500 responses make it to the client.') | ||
| client.Streams.All += Testers.ContainsExpression('x-response: first', 'Verify that the first response was received.') | ||
| client.Streams.All += Testers.ContainsExpression('x-response: second', 'Verify that the second response was received.') | ||
| client.Streams.All += Testers.ContainsExpression('x-response: third', 'Verify that the third response was received.') | ||
| client.Streams.All += Testers.ContainsExpression('x-response: fourth', 'Verify that the fourth response was received.') | ||
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| EscalateTest() |
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