commit 3a521cc575f32573dba27abda09c057920ee2eba Author: teor teor@torproject.org Date: Mon Jun 17 18:13:33 2019 +1000

relaylist: stop using the current time when a consensus is downloaded twice

Instead: * use the consensus valid-after time, or * use the supplied timestamp, or * warn and use the current time.

This should fix the occasional CI failure, when the current time is 1 second later than the test consensus time. (Or it should warn, and we can fix the test code.)

Fixes bug 30909; bugfix on 1.1.0. --- sbws/lib/relaylist.py | 51 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 32 insertions(+), 19 deletions(-)

diff --git a/sbws/lib/relaylist.py b/sbws/lib/relaylist.py index 289e0d2..1fc650a 100644 --- a/sbws/lib/relaylist.py +++ b/sbws/lib/relaylist.py @@ -175,34 +175,47 @@ class Relay: return self._consensus_timestamps[-1] return None

+ def _append_consensus_timestamp_if_later(self, timestamp): + """Append timestamp to the list of consensus timestamps, if it is later + than the most recent existing timestamp, or there are no timestamps. + Should only be called by _add_consensus_timestamp(). + timestamp must not be None, and it must not be zero. + """ + if not timestamp: + log.info('Bad timestamp %s, skipping consensus timestamp ' + 'update for relay %s', timestamp, self.fingerprint) + return + # The consensus timestamp list was initialized. + if self.last_consensus_timestamp is not None: + # timestamp is more recent than the most recent stored + # consensus timestamp. + if timestamp > self.last_consensus_timestamp: + # Add timestamp + self._consensus_timestamps.append(timestamp) + # The consensus timestamp list was not initialized. + else: + # Add timestamp + self._consensus_timestamps.append(timestamp) + def _add_consensus_timestamp(self, timestamp=None): """Add the consensus timestamp in which this relay is present. """ # It is possible to access to the relay's consensensus Valid-After + # so believe it, rather than the supplied timestamp if self.consensus_valid_after is not None: - # The consensus timestamp list was initialized. - if self.last_consensus_timestamp is not None: - # Valid-After is more recent than the most recent stored - # consensus timestamp. - if self.consensus_valid_after > self.last_consensus_timestamp: - # Add Valid-After - self._consensus_timestamps.append( - self.consensus_valid_after - ) - # The consensus timestamp list was not initialized. - else: - # Add Valid-After - self._consensus_timestamps.append(self.consensus_valid_after) - # If there was already a list the timestamp arg is more recent than - # the most recent timestamp stored, - elif (self.last_consensus_timestamp is not None - and timestamp > self.last_consensus_timestamp): + self._append_consensus_timestamp_if_later( + self.consensus_valid_after + ) + elif timestamp: # Add the arg timestamp. - self._consensus_timestamps.append(timestamp) + self._append_consensus_timestamp_if_later(timestamp) # In any other case else: + log.warning('Bad timestamp %s, using current time for consensus ' + 'timestamp update for relay %s', + timestamp, self.fingerprint) # Add the current datetime - self._consensus_timestamps.append( + self._append_consensus_timestamp_if_later( datetime.utcnow().replace(microsecond=0))

def _remove_old_consensus_timestamps(