jeff/starlink-grpc-tools
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Detect and correct dish time getting out of sync

Browse source 
If the number of samples reported in the history varies from the number of seconds elapsed as detected on the script host's system clock by more than +/- 2 seconds, forcibly correct the time base back to current system time. This doesn't seem to trigger on hosts with NTP synced system clocks (possibly because the dish's clock is, too), so no attempt is made to make this graceful, there will just be a discontinuity in the timestamps assigned to samples if this correction is made.

Also, enforce a maximum batch size for data points writes to the InfluxDB server. It's somewhat arbitrarily set at 5000 data points. A write of the full 12 hour history buffer would be 43200 data points, so this will break that up a bit.

Related to issue #5
This commit is contained in:
sparky8512 2021-01-19 18:49:46 -08:00
parent 9b96c5dcc6
commit edcf2a2ee4
1 changed files with 24 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
dishHistoryInflux.py
View file

@ -64,6 +64,7 @@ def main():
icargs = {"host": host_default, "timeout": 5, "database": database_default}
rp = None
flush_limit = 6
max_batch = 5000
# For each of these check they are both set and not empty string
influxdb_host = os.environ.get("INFLUXDB_HOST")
@ -187,6 +188,12 @@ def main():
def flush_points(client):
try:
while len(gstate.points) > max_batch:
client.write_points(gstate.points[:max_batch], retention_policy=rp)
if verbose:
print("Data points written: " + str(max_batch))
del gstate.points[:max_batch]
if gstate.points:
client.write_points(gstate.points, retention_policy=rp)
if verbose:
print("Data points written: " + str(len(gstate.points)))
@ -198,18 +205,28 @@ def main():
return 0
def process_bulk_data():
# need to pull this now in case it is needed later
now = time.time()
before = time.time()
start = gstate.counter
parse_samples = samples if start is None else -1
general, bulk = starlink_grpc.history_bulk_data(parse_samples, start=start, verbose=verbose)
after = time.time()
parsed_samples = general["samples"]
new_counter = general["current"]
timestamp = gstate.timestamp
if timestamp is None or new_counter != gstate.counter + parsed_samples:
timestamp = now
# Check this first, so it doesn't report as lost time sync
if gstate.counter is not None and new_counter != gstate.counter + parsed_samples:
timestamp = None
# Allow up to 2 seconds of time drift before forcibly re-syncing, since
# +/- 1 second can happen just due to scheduler timing.
if timestamp is not None and not before - 2.0 <= timestamp + parsed_samples <= after + 2.0:
if verbose:
print("Lost sample time sync at: " +
str(datetime.fromtimestamp(timestamp + parsed_samples, tz=timezone.utc)))
timestamp = None
if timestamp is None:
timestamp = before
if verbose:
print("Establishing new time base: " + str(new_counter) + " -> " +
str(datetime.fromtimestamp(timestamp, tz=timezone.utc)))