diff options
Diffstat (limited to 'synapse/api/ratelimiting.py')
| -rw-r--r-- | synapse/api/ratelimiting.py | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/synapse/api/ratelimiting.py b/synapse/api/ratelimiting.py index 3bb5b3da37..296c4a1c17 100644 --- a/synapse/api/ratelimiting.py +++ b/synapse/api/ratelimiting.py @@ -14,6 +14,8 @@ import collections +from synapse.api.errors import LimitExceededError + class Ratelimiter(object): """ @@ -23,12 +25,13 @@ class Ratelimiter(object): def __init__(self): self.message_counts = collections.OrderedDict() - def send_message(self, user_id, time_now_s, msg_rate_hz, burst_count, update=True): - """Can the user send a message? + def can_do_action(self, key, time_now_s, rate_hz, burst_count, update=True): + """Can the entity (e.g. user or IP address) perform the action? Args: - user_id: The user sending a message. + key: The key we should use when rate limiting. Can be a user ID + (when sending events), an IP address, etc. time_now_s: The time now. - msg_rate_hz: The long term number of messages a user can send in a + rate_hz: The long term number of messages a user can send in a second. burst_count: How many messages the user can send before being limited. @@ -41,10 +44,10 @@ class Ratelimiter(object): """ self.prune_message_counts(time_now_s) message_count, time_start, _ignored = self.message_counts.get( - user_id, (0., time_now_s, None), + key, (0., time_now_s, None), ) time_delta = time_now_s - time_start - sent_count = message_count - time_delta * msg_rate_hz + sent_count = message_count - time_delta * rate_hz if sent_count < 0: allowed = True time_start = time_now_s @@ -56,13 +59,13 @@ class Ratelimiter(object): message_count += 1 if update: - self.message_counts[user_id] = ( - message_count, time_start, msg_rate_hz + self.message_counts[key] = ( + message_count, time_start, rate_hz ) - if msg_rate_hz > 0: + if rate_hz > 0: time_allowed = ( - time_start + (message_count - burst_count + 1) / msg_rate_hz + time_start + (message_count - burst_count + 1) / rate_hz ) if time_allowed < time_now_s: time_allowed = time_now_s @@ -72,12 +75,22 @@ class Ratelimiter(object): return allowed, time_allowed def prune_message_counts(self, time_now_s): - for user_id in list(self.message_counts.keys()): - message_count, time_start, msg_rate_hz = ( - self.message_counts[user_id] + for key in list(self.message_counts.keys()): + message_count, time_start, rate_hz = ( + self.message_counts[key] ) time_delta = time_now_s - time_start - if message_count - time_delta * msg_rate_hz > 0: + if message_count - time_delta * rate_hz > 0: break else: - del self.message_counts[user_id] + del self.message_counts[key] + + def ratelimit(self, key, time_now_s, rate_hz, burst_count, update=True): + allowed, time_allowed = self.can_do_action( + key, time_now_s, rate_hz, burst_count, update + ) + + if not allowed: + raise LimitExceededError( + retry_after_ms=int(1000 * (time_allowed - time_now_s)), + ) |