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ready: Add option to enable envoy readiness endpoint from worker
/ready endpoint used by emissary is using the admin port (8001 by default). This generates a problem during config reloads with large configs as the admin thread is blocking so the /ready endpoint can be very slow to answer (in the order of several seconds, even more). The problem is described in this envoy issue: envoyproxy/envoy#16425 This change is trying to fix the /ready endpoint problem. The /ready endpoint can be exposed in the worker pool by adding a listener+ health check http filter. This way, the /ready endpoint is fast and it is not blocked by any config reload or blocking admin operation as it depends on the worker pool. Future changes will allow to use this endpoint with diagd and the go code as well so they get a fast /ready endpoint and they do not use the admin port. This listener is disabled by default. the config "read_port" can be used to set the port and enable this new listener on envoy.
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| Original file line number | Diff line number | Diff line change |
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| # Copyright 2021 Datawire. All rights reserved. | ||
| # | ||
| # Licensed 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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| from typing import TYPE_CHECKING | ||
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| from .v2listener import V2Listener | ||
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| if TYPE_CHECKING: | ||
| from . import V2Config # pragma: no cover | ||
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| class V2Ready(dict): | ||
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| @classmethod | ||
| def generate(cls, config: 'V2Config') -> None: | ||
| # Inject the ready listener to the list of listeners if enabled | ||
| rport = config.ir.aconf.module_lookup('ambassador', 'ready_port', -1) | ||
| if rport <= 0: | ||
| return | ||
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| ready_listener = { | ||
| 'name': 'ambassador-listener-ready-%s' % rport, | ||
| 'address': { | ||
| 'socket_address': { | ||
| 'address': '0.0.0.0', # Todo: Change this to 127.0.0.1 or make it a parameter | ||
| 'port_value': rport, | ||
| 'protocol': 'TCP' | ||
| } | ||
| }, | ||
| 'filter_chains': [ | ||
| { | ||
| 'filters': [ | ||
| { | ||
| 'name': 'envoy.filters.network.http_connection_manager', | ||
| 'typed_config': { | ||
| '@type': 'type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager', | ||
| "access_log": [ | ||
| { | ||
| "name": "envoy.access_loggers.file", | ||
| "typed_config": { | ||
| "@type": "type.googleapis.com/envoy.config.accesslog.v2.FileAccessLog", | ||
| "format": "ACCESS [%START_TIME%] \"%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%\" %RESPONSE_CODE% %RESPONSE_FLAGS% %BYTES_RECEIVED% %BYTES_SENT% %DURATION% %RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% \"%REQ(X-FORWARDED-FOR)%\" \"%REQ(USER-AGENT)%\" \"%REQ(X-REQUEST-ID)%\" \"%REQ(:AUTHORITY)%\" \"%UPSTREAM_HOST%\"\n", | ||
| "path": "/dev/fd/1" | ||
| } | ||
| } | ||
| ], | ||
| 'stat_prefix': 'ready_http', | ||
| 'route_config': { | ||
| 'name': 'local_route' | ||
| }, | ||
| 'http_filters': [ | ||
| { | ||
| 'name': 'envoy.filters.http.health_check', | ||
| 'typed_config': { | ||
| '@type': 'type.googleapis.com/envoy.config.filter.http.health_check.v2.HealthCheck', | ||
| 'pass_through_mode': False, | ||
| 'headers': [ | ||
| { | ||
| 'name': ':path', | ||
| 'exact_match': '/ready' | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| { | ||
| 'name': 'envoy.filters.http.router' | ||
| } | ||
| ] | ||
| } | ||
| } | ||
| ] | ||
| } | ||
| ] | ||
| } | ||
| config.static_resources['listeners'].append(ready_listener) |
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