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Allow for the configuration of max request retries and min/max retry delays in the matrix federation client (#15783)

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Mathieu Velten 2023-06-21 10:41:11 +02:00 committed by GitHub
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5 changed files with 100 additions and 22 deletions
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1
changelog.d/15783.misc Normal file
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@ -0,0 +1 @@
Allow for the configuration of max request retries and min/max retry delays in the matrix federation client.

26
docs/usage/configuration/config_documentation.md
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@ -1196,6 +1196,32 @@ Example configuration:
allow_device_name_lookup_over_federation: true
```
---
### `federation`
The federation section defines some sub-options related to federation.
The following options are related to configuring timeout and retry logic for one request,
independently of the others.
Short retry algorithm is used when something or someone will wait for the request to have an
answer, while long retry is used for requests that happen in the background,
like sending a federation transaction.
* `client_timeout`: timeout for the federation requests. Default to 60s.
* `max_short_retry_delay`: maximum delay to be used for the short retry algo. Default to 2s.
* `max_long_retry_delay`: maximum delay to be used for the short retry algo. Default to 60s.
* `max_short_retries`: maximum number of retries for the short retry algo. Default to 3 attempts.
* `max_long_retries`: maximum number of retries for the long retry algo. Default to 10 attempts.
Example configuration:
```yaml
federation:
client_timeout: 180s
max_short_retry_delay: 7s
max_long_retry_delay: 100s
max_short_retries: 5
max_long_retries: 20
```
---
## Caching
Options related to caching.

16
synapse/config/federation.py
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@ -22,6 +22,8 @@ class FederationConfig(Config):
section = "federation"
def read_config(self, config: JsonDict, **kwargs: Any) -> None:
federation_config = config.setdefault("federation", {})
# FIXME: federation_domain_whitelist needs sytests
self.federation_domain_whitelist: Optional[dict] = None
federation_domain_whitelist = config.get("federation_domain_whitelist", None)
@ -49,5 +51,19 @@ class FederationConfig(Config):
"allow_device_name_lookup_over_federation", False
)
# Allow for the configuration of timeout, max request retries
# and min/max retry delays in the matrix federation client.
self.client_timeout_ms = Config.parse_duration(
federation_config.get("client_timeout", "60s")
)
self.max_long_retry_delay_ms = Config.parse_duration(
federation_config.get("max_long_retry_delay", "60s")
)
self.max_short_retry_delay_ms = Config.parse_duration(
federation_config.get("max_short_retry_delay", "2s")
)
self.max_long_retries = federation_config.get("max_long_retries", 10)
self.max_short_retries = federation_config.get("max_short_retries", 3)
_METRICS_FOR_DOMAINS_SCHEMA = {"type": "array", "items": {"type": "string"}}

59
synapse/http/matrixfederationclient.py
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@ -95,8 +95,6 @@ incoming_responses_counter = Counter(
)
MAX_LONG_RETRIES = 10
MAX_SHORT_RETRIES = 3
MAXINT = sys.maxsize
@ -413,7 +411,16 @@ class MatrixFederationHttpClient:
self.clock = hs.get_clock()
self._store = hs.get_datastores().main
self.version_string_bytes = hs.version_string.encode("ascii")
self.default_timeout = 60
self.default_timeout_seconds = hs.config.federation.client_timeout_ms / 1000
self.max_long_retry_delay_seconds = (
hs.config.federation.max_long_retry_delay_ms / 1000
)
self.max_short_retry_delay_seconds = (
hs.config.federation.max_short_retry_delay_ms / 1000
)
self.max_long_retries = hs.config.federation.max_long_retries
self.max_short_retries = hs.config.federation.max_short_retries
self._cooperator = Cooperator(scheduler=_make_scheduler(self.reactor))
@ -542,10 +549,10 @@ class MatrixFederationHttpClient:
logger.exception(f"Invalid destination: {request.destination}.")
raise FederationDeniedError(request.destination)
if timeout:
if timeout is not None:
_sec_timeout = timeout / 1000
else:
_sec_timeout = self.default_timeout
_sec_timeout = self.default_timeout_seconds
if (
self.hs.config.federation.federation_domain_whitelist is not None
@ -590,9 +597,9 @@ class MatrixFederationHttpClient:
# XXX: Would be much nicer to retry only at the transaction-layer
# (once we have reliable transactions in place)
if long_retries:
retries_left = MAX_LONG_RETRIES
retries_left = self.max_long_retries
else:
retries_left = MAX_SHORT_RETRIES
retries_left = self.max_short_retries
url_bytes = request.uri
url_str = url_bytes.decode("ascii")
@ -737,24 +744,34 @@ class MatrixFederationHttpClient:
if retries_left and not timeout:
if long_retries:
delay = 4 ** (MAX_LONG_RETRIES + 1 - retries_left)
delay = min(delay, 60)
delay *= random.uniform(0.8, 1.4)
delay_seconds = 4 ** (
self.max_long_retries + 1 - retries_left
)
delay_seconds = min(
delay_seconds, self.max_long_retry_delay_seconds
)
delay_seconds *= random.uniform(0.8, 1.4)
else:
delay = 0.5 * 2 ** (MAX_SHORT_RETRIES - retries_left)
delay = min(delay, 2)
delay *= random.uniform(0.8, 1.4)
delay_seconds = 0.5 * 2 ** (
self.max_short_retries - retries_left
)
delay_seconds = min(
delay_seconds, self.max_short_retry_delay_seconds
)
delay_seconds *= random.uniform(0.8, 1.4)
logger.debug(
"{%s} [%s] Waiting %ss before re-sending...",
request.txn_id,
request.destination,
delay,
delay_seconds,
)
# Sleep for the calculated delay, or wake up immediately
# if we get notified that the server is back up.
await self._sleeper.sleep(request.destination, delay * 1000)
await self._sleeper.sleep(
request.destination, delay_seconds * 1000
)
retries_left -= 1
else:
raise
@ -953,7 +970,7 @@ class MatrixFederationHttpClient:
if timeout is not None:
_sec_timeout = timeout / 1000
else:
_sec_timeout = self.default_timeout
_sec_timeout = self.default_timeout_seconds
if parser is None:
parser = cast(ByteParser[T], JsonParser())
@ -1031,10 +1048,10 @@ class MatrixFederationHttpClient:
ignore_backoff=ignore_backoff,
)
if timeout:
if timeout is not None:
_sec_timeout = timeout / 1000
else:
_sec_timeout = self.default_timeout
_sec_timeout = self.default_timeout_seconds
body = await _handle_response(
self.reactor, _sec_timeout, request, response, start_ms, parser=JsonParser()
@ -1142,7 +1159,7 @@ class MatrixFederationHttpClient:
if timeout is not None:
_sec_timeout = timeout / 1000
else:
_sec_timeout = self.default_timeout
_sec_timeout = self.default_timeout_seconds
if parser is None:
parser = cast(ByteParser[T], JsonParser())
@ -1218,7 +1235,7 @@ class MatrixFederationHttpClient:
if timeout is not None:
_sec_timeout = timeout / 1000
else:
_sec_timeout = self.default_timeout
_sec_timeout = self.default_timeout_seconds
body = await _handle_response(
self.reactor, _sec_timeout, request, response, start_ms, parser=JsonParser()
@ -1270,7 +1287,7 @@ class MatrixFederationHttpClient:
try:
d = read_body_with_max_size(response, output_stream, max_size)
d.addTimeout(self.default_timeout, self.reactor)
d.addTimeout(self.default_timeout_seconds, self.reactor)
length = await make_deferred_yieldable(d)
except BodyExceededMaxSize:
msg = "Requested file is too large > %r bytes" % (max_size,)

20
tests/http/test_matrixfederationclient.py
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@ -40,7 +40,7 @@ from synapse.server import HomeServer
from synapse.util import Clock
from tests.server import FakeTransport
from tests.unittest import HomeserverTestCase
from tests.unittest import HomeserverTestCase, override_config
def check_logcontext(context: LoggingContextOrSentinel) -> None:
@ -640,3 +640,21 @@ class FederationClientTests(HomeserverTestCase):
self.cl.build_auth_headers(
b"", b"GET", b"https://example.com", destination_is=b""
)
@override_config(
{
"federation": {
"client_timeout": "180s",
"max_long_retry_delay": "100s",
"max_short_retry_delay": "7s",
"max_long_retries": 20,
"max_short_retries": 5,
}
}
)
def test_configurable_retry_and_delay_values(self) -> None:
self.assertEqual(self.cl.default_timeout_seconds, 180)
self.assertEqual(self.cl.max_long_retry_delay_seconds, 100)
self.assertEqual(self.cl.max_short_retry_delay_seconds, 7)
self.assertEqual(self.cl.max_long_retries, 20)
self.assertEqual(self.cl.max_short_retries, 5)