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Calculate clock offset within 20 first pings and then freeze it

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This commit is contained in:
Tomasz Fluxid Kowalczyk 2012-02-15 19:45:05 +01:00
parent e25ba023ed
commit 1e23e98d78
1 changed files with 23 additions and 4 deletions
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27
syncplay/server.py
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@ -141,6 +141,7 @@ class WatcherInfo(object):
self.ping = None
self.time_offset = 0
self.time_offset_data = []
self.last_ping_time = None
self.last_ping_value = None
@ -278,10 +279,28 @@ class SyncFactory(Factory):
return
if watcher.last_ping_value == value:
ping = (time.time() - watcher.last_ping_time)/2
if watcher.ping is None or watcher.ping > ping:
watcher.ping = ping
watcher.time_offset = time.time() - (ctime + ping)
curtime = time.time()
watcher.ping = ping = (curtime - watcher.last_ping_time)/2
if watcher.time_offset_data is not None:
time_offset = curtime - (ctime + ping)
watcher.time_offset_data.append((ping, time_offset))
if len(watcher.time_offset_data) > 1:
pmax = max(p for p,_ in watcher.time_offset_data)
psum, pweights = 0, 0
for ping, offset in watcher.time_offset_data:
ping = 1-(ping/pmax)
pweights += ping
psum += ping*offset
watcher.time_offset = psum/pweights
else:
watcher.time_offset = time_offset
if len(watcher.time_offset_data) > 20:
watcher.time_offset_data = None
#print watcher.name, 'last ping', watcher.ping, 'time offset %.6f' % watcher.time_offset
self.schedule_send_ping(watcher_proto)