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import logging
import math
import threading
from botocore.retries import bucket, standard, throttling
logger = logging.getLogger(__name__)
def register_retry_handler(client):
clock = bucket.Clock()
rate_adjustor = throttling.CubicCalculator(
starting_max_rate=0, start_time=clock.current_time()
)
token_bucket = bucket.TokenBucket(max_rate=1, clock=clock)
rate_clocker = RateClocker(clock)
throttling_detector = standard.ThrottlingErrorDetector(
retry_event_adapter=standard.RetryEventAdapter(),
)
limiter = ClientRateLimiter(
rate_adjustor=rate_adjustor,
rate_clocker=rate_clocker,
token_bucket=token_bucket,
throttling_detector=throttling_detector,
clock=clock,
)
client.meta.events.register(
'before-send',
limiter.on_sending_request,
)
client.meta.events.register(
'needs-retry',
limiter.on_receiving_response,
)
return limiter
class ClientRateLimiter:
_MAX_RATE_ADJUST_SCALE = 2.0
def __init__(
self,
rate_adjustor,
rate_clocker,
token_bucket,
throttling_detector,
clock,
):
self._rate_adjustor = rate_adjustor
self._rate_clocker = rate_clocker
self._token_bucket = token_bucket
self._throttling_detector = throttling_detector
self._clock = clock
self._enabled = False
self._lock = threading.Lock()
def on_sending_request(self, request, **kwargs):
if self._enabled:
self._token_bucket.acquire()
# Hooked up to needs-retry.
def on_receiving_response(self, **kwargs):
measured_rate = self._rate_clocker.record()
timestamp = self._clock.current_time()
with self._lock:
if not self._throttling_detector.is_throttling_error(**kwargs):
new_rate = self._rate_adjustor.success_received(timestamp)
else:
if not self._enabled:
rate_to_use = measured_rate
else:
rate_to_use = min(
measured_rate, self._token_bucket.max_rate
)
new_rate = self._rate_adjustor.error_received(
rate_to_use, timestamp
)
logger.debug(
"Throttling response received, new send rate: %s "
"measured rate: %s, token bucket capacity "
"available: %s",
new_rate,
measured_rate,
self._token_bucket.available_capacity,
)
self._enabled = True
self._token_bucket.max_rate = min(
new_rate, self._MAX_RATE_ADJUST_SCALE * measured_rate
)
class RateClocker:
"""Tracks the rate at which a client is sending a request."""
_DEFAULT_SMOOTHING = 0.8
# Update the rate every _TIME_BUCKET_RANGE seconds.
_TIME_BUCKET_RANGE = 0.5
def __init__(
self,
clock,
smoothing=_DEFAULT_SMOOTHING,
time_bucket_range=_TIME_BUCKET_RANGE,
):
self._clock = clock
self._measured_rate = 0
self._smoothing = smoothing
self._last_bucket = math.floor(self._clock.current_time())
self._time_bucket_scale = 1 / self._TIME_BUCKET_RANGE
self._count = 0
self._lock = threading.Lock()
def record(self, amount=1):
with self._lock:
t = self._clock.current_time()
bucket = (
math.floor(t * self._time_bucket_scale)
/ self._time_bucket_scale
)
self._count += amount
if bucket > self._last_bucket:
current_rate = self._count / float(bucket - self._last_bucket)
self._measured_rate = (current_rate * self._smoothing) + (
self._measured_rate * (1 - self._smoothing)
)
self._count = 0
self._last_bucket = bucket
return self._measured_rate
@property
def measured_rate(self):
return self._measured_rate