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Reorganize history parsing logic into a separate module

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Moves the parsing logic that will be shared by some upcoming scripts out into a separate module.

There's still just as much duplication between the JSON parser and the grpc parser as there was before, but this should at least prevent further duplication of this logic.

This also adds some proper documentation for what each of the stats means.
This commit is contained in:
sparky8512 2021-01-06 11:46:50 -08:00
parent d165791559
commit 170dd2daae
4 changed files with 539 additions and 280 deletions
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202
dishHistoryStats.py
View file

@ -2,7 +2,7 @@
######################################################################
#
# Equivalent script to parseJsonHistory.py, except integrating the
# gRPC calls, instead of relying on separatate invocation of grpcurl.
# gRPC calls, instead of relying on separate invocation of grpcurl.
#
# This script examines the most recent samples from the history data
# and computes several different metrics related to packet loss. By
@ -10,181 +10,103 @@
#
######################################################################
import grpc
import spacex.api.device.device_pb2
import spacex.api.device.device_pb2_grpc
import datetime
import sys
import getopt
from itertools import chain
import starlink_grpc
fArgError = False
arg_error = False
try:
opts, args = getopt.getopt(sys.argv[1:], "ahrs:vH")
except getopt.GetoptError as err:
print(str(err))
fArgError = True
arg_error = True
# Default to 1 hour worth of data samples.
parseSamples = 3600
fUsage = False
fVerbose = False
fParseAll = False
fHeader = False
fRunLengths = False
samples_default = 3600
samples = samples_default
print_usage = False
verbose = False
parse_all = False
print_header = False
run_lengths = False
if not fArgError:
if not arg_error:
if len(args) > 0:
fArgError = True
arg_error = True
else:
for opt, arg in opts:
if opt == "-a":
fParseAll = True
parse_all = True
elif opt == "-h":
fUsage = True
print_usage = True
elif opt == "-r":
fRunLengths = True
run_lengths = True
elif opt == "-s":
parseSamples = int(arg)
samples = int(arg)
elif opt == "-v":
fVerbose = True
verbose = True
elif opt == "-H":
fHeader = True
print_header = True
if fUsage or fArgError:
if print_usage or arg_error:
print("Usage: " + sys.argv[0] + " [options...]")
print("Options:")
print(" -a: Parse all valid samples")
print(" -h: Be helpful")
print(" -r: Include ping drop run length stats")
print(" -s <num>: Parse <num> data samples, default: "+str(parseSamples))
print(" -s <num>: Parse <num> data samples, default: " + str(samples_default))
print(" -v: Be verbose")
print(" -H: print CSV header instead of parsing file")
sys.exit(1 if fArgError else 0)
sys.exit(1 if arg_error else 0)
if fHeader:
header = "datetimestamp_utc,samples,total_ping_drop,count_full_ping_drop,count_obstructed,total_obstructed_ping_drop,count_full_obstructed_ping_drop,count_unscheduled,total_unscheduled_ping_drop,count_full_unscheduled_ping_drop"
if fRunLengths:
header+= ",init_run_fragment,final_run_fragment,"
header += ",".join("run_seconds_" + str(x) for x in range(1, 61)) + ","
header += ",".join("run_minutes_" + str(x) for x in range(1, 60))
header += ",run_minutes_60_or_greater"
print(header)
fields, rl_fields = starlink_grpc.history_ping_field_names()
if print_header:
header = ["datetimestamp_utc"]
header.extend(fields)
if run_lengths:
for field in rl_fields:
if field.startswith("run_"):
header.extend(field + "_" + str(x) for x in range(1, 61))
else:
header.append(field)
print(",".join(header))
sys.exit(0)
with grpc.insecure_channel('192.168.100.1:9200') as channel:
stub = spacex.api.device.device_pb2_grpc.DeviceStub(channel)
response = stub.Handle(spacex.api.device.device_pb2.Request(get_history={}))
timestamp = datetime.datetime.utcnow()
historyData = response.dish_get_history
stats, rl_stats = starlink_grpc.history_ping_stats(-1 if parse_all else samples,
verbose)
# 'current' is the count of data samples written to the ring buffer,
# irrespective of buffer wrap.
current = int(historyData.current)
nSamples = len(historyData.pop_ping_drop_rate)
if stats is None or rl_stats is None:
# verbose output already happened, so just bail.
sys.exit(1)
if fVerbose:
print("current: " + str(current))
print("All samples: " + str(nSamples))
nSamples = min(nSamples,current)
if fVerbose:
print("Valid samples: " + str(nSamples))
# This is ring buffer offset, so both index to oldest data sample and
# index to next data sample after the newest one.
offset = current % nSamples
tot = 0
totOne = 0
totUnsched = 0
totUnschedD = 0
totUnschedOne = 0
totObstruct = 0
totObstructD = 0
totObstructOne = 0
secondRuns = [0] * 60
minuteRuns = [0] * 60
runLength = 0
initRun = None
if fParseAll or nSamples < parseSamples:
parseSamples = nSamples
# Parse the most recent parseSamples-sized set of samples. This will
# iterate samples in order from oldest to newest, although that's not
# actually required for the current set of stats being computed below.
if parseSamples <= offset:
sampleRange = range(offset - parseSamples, offset)
if verbose:
print("Parsed samples: " + str(stats["samples"]))
print("Total ping drop: " + str(stats["total_ping_drop"]))
print("Count of drop == 1: " + str(stats["count_full_ping_drop"]))
print("Obstructed: " + str(stats["count_obstructed"]))
print("Obstructed ping drop: " + str(stats["total_obstructed_ping_drop"]))
print("Obstructed drop == 1: " + str(stats["count_full_obstructed_ping_drop"]))
print("Unscheduled: " + str(stats["count_unscheduled"]))
print("Unscheduled ping drop: " + str(stats["total_unscheduled_ping_drop"]))
print("Unscheduled drop == 1: " + str(stats["count_full_unscheduled_ping_drop"]))
if run_lengths:
print("Initial drop run fragment: " + str(rl_stats["init_run_fragment"]))
print("Final drop run fragment: " + str(rl_stats["final_run_fragment"]))
print("Per-second drop runs: " + ", ".join(str(x) for x in rl_stats["run_seconds"]))
print("Per-minute drop runs: " + ", ".join(str(x) for x in rl_stats["run_minutes"]))
else:
sampleRange = chain(range(nSamples + offset - parseSamples, nSamples), range(0, offset))
for i in sampleRange:
d = historyData.pop_ping_drop_rate[i]
tot += d
if d >= 1:
totOne += d
runLength += 1
elif runLength > 0:
if initRun is None:
initRun = runLength
csv_data = [timestamp.replace(microsecond=0).isoformat()]
csv_data.extend(str(stats[field]) for field in fields)
if run_lengths:
for field in rl_fields:
if field.startswith("run_"):
csv_data.extend(str(substat) for substat in rl_stats[field])
else:
if runLength <= 60:
secondRuns[runLength-1] += runLength
else:
minuteRuns[min((runLength-1)//60-1, 59)] += runLength
runLength = 0
elif initRun is None:
initRun = 0
if not historyData.scheduled[i]:
totUnsched += 1
totUnschedD += d
if d >= 1:
totUnschedOne += d
# scheduled=false and obstructed=true do not ever appear to overlap,
# but in case they do in the future, treat that as just unscheduled
# in order to avoid double-counting it.
elif historyData.obstructed[i]:
totObstruct += 1
totObstructD += d
if d >= 1:
totObstructOne += d
# If the entire sample set is one big drop run, it will be both initial
# fragment (continued from prior sample range) and final one (continued
# to next sample range), but to avoid double-reporting, just call it
# the initial run.
if initRun is None:
initRun = runLength
runLength = 0
if fVerbose:
print("Parsed samples: " + str(parseSamples))
print("Total ping drop: " + str(tot))
print("Count of drop == 1: " + str(totOne))
print("Obstructed: " + str(totObstruct))
print("Obstructed ping drop: " + str(totObstructD))
print("Obstructed drop == 1: " + str(totObstructOne))
print("Unscheduled: " + str(totUnsched))
print("Unscheduled ping drop: " + str(totUnschedD))
print("Unscheduled drop == 1: " + str(totUnschedOne))
if fRunLengths:
print("Initial drop run fragment: " + str(initRun))
print("Final drop run fragment: " + str(runLength))
print("Per-second drop runs: " + ", ".join(str(x) for x in secondRuns))
print("Per-minute drop runs: " + ", ".join(str(x) for x in minuteRuns))
else:
# NOTE: When changing data output format, also change the -H header printing above.
csvData = timestamp.replace(microsecond=0).isoformat() + "," + ",".join(str(x) for x in [parseSamples, tot, totOne, totObstruct, totObstructD, totObstructOne, totUnsched, totUnschedD, totUnschedOne])
if fRunLengths:
csvData += "," + ",".join(str(x) for x in chain([initRun, runLength], secondRuns, minuteRuns))
print(csvData)
csv_data.append(str(rl_stats[field]))
print(",".join(csv_data))

198
parseJsonHistory.py
View file

@ -13,181 +13,105 @@
#
######################################################################
import json
import datetime
import sys
import getopt
from itertools import chain
import starlink_json
fArgError = False
arg_error = False
try:
opts, args = getopt.getopt(sys.argv[1:], "ahrs:vH")
except getopt.GetoptError as err:
print(str(err))
fArgError = True
arg_error = True
# Default to 1 hour worth of data samples.
parseSamples = 3600
fUsage = False
fVerbose = False
fParseAll = False
fHeader = False
fRunLengths = False
samples_default = 3600
samples = samples_default
print_usage = False
verbose = False
parse_all = False
print_header = False
run_lengths = False
if not fArgError:
if not arg_error:
if len(args) > 1:
fArgError = True
arg_error = True
else:
for opt, arg in opts:
if opt == "-a":
fParseAll = True
parse_all = True
elif opt == "-h":
fUsage = True
print_usage = True
elif opt == "-r":
fRunLengths = True
run_lengths = True
elif opt == "-s":
parseSamples = int(arg)
samples = int(arg)
elif opt == "-v":
fVerbose = True
verbose = True
elif opt == "-H":
fHeader = True
print_header = True
if fUsage or fArgError:
if print_usage or arg_error:
print("Usage: " + sys.argv[0] + " [options...] [<file>]")
print(" where <file> is the file to parse, default: stdin")
print("Options:")
print(" -a: Parse all valid samples")
print(" -h: Be helpful")
print(" -r: Include ping drop run length stats")
print(" -s <num>: Parse <num> data samples, default: "+str(parseSamples))
print(" -s <num>: Parse <num> data samples, default: " + str(samples_default))
print(" -v: Be verbose")
print(" -H: print CSV header instead of parsing file")
sys.exit(1 if fArgError else 0)
sys.exit(1 if arg_error else 0)
if fHeader:
header = "datetimestamp_utc,samples,total_ping_drop,count_full_ping_drop,count_obstructed,total_obstructed_ping_drop,count_full_obstructed_ping_drop,count_unscheduled,total_unscheduled_ping_drop,count_full_unscheduled_ping_drop"
if fRunLengths:
header+= ",init_run_fragment,final_run_fragment,"
header += ",".join("run_seconds_" + str(x) for x in range(1, 61)) + ","
header += ",".join("run_minutes_" + str(x) for x in range(1, 60))
header += ",run_minutes_60_or_greater"
print(header)
sys.exit(0)
fields, rl_fields = starlink_json.history_ping_field_names()
# Allow "-" to be specified as file for stdin.
if len(args) == 0 or args[0] == "-":
jsonData = json.load(sys.stdin)
if print_header:
header = ["datetimestamp_utc"]
header.extend(fields)
if run_lengths:
for field in rl_fields:
if field.startswith("run_"):
header.extend(field + "_" + str(x) for x in range(1, 61))
else:
jsonFile = open(args[0])
jsonData = json.load(jsonFile)
jsonFile.close()
header.append(field)
print(",".join(header))
sys.exit(0)
timestamp = datetime.datetime.utcnow()
historyData = jsonData['dishGetHistory']
stats, rl_stats = starlink_json.history_ping_stats(args[0] if args else "-",
-1 if parse_all else samples,
verbose)
# 'current' is the count of data samples written to the ring buffer,
# irrespective of buffer wrap.
current = int(historyData['current'])
nSamples = len(historyData['popPingDropRate'])
if stats is None or rl_stats is None:
# verbose output already happened, so just bail.
sys.exit(1)
if fVerbose:
print("current: " + str(current))
print("All samples: " + str(nSamples))
nSamples = min(nSamples,current)
if fVerbose:
print("Valid samples: " + str(nSamples))
# This is ring buffer offset, so both index to oldest data sample and
# index to next data sample after the newest one.
offset = current % nSamples
tot = 0
totOne = 0
totUnsched = 0
totUnschedD = 0
totUnschedOne = 0
totObstruct = 0
totObstructD = 0
totObstructOne = 0
secondRuns = [0] * 60
minuteRuns = [0] * 60
runLength = 0
initRun = None
if fParseAll or nSamples < parseSamples:
parseSamples = nSamples
# Parse the most recent parseSamples-sized set of samples. This will
# iterate samples in order from oldest to newest, although that's not
# actually required for the current set of stats being computed below.
if parseSamples <= offset:
sampleRange = range(offset - parseSamples, offset)
if verbose:
print("Parsed samples: " + str(stats["samples"]))
print("Total ping drop: " + str(stats["total_ping_drop"]))
print("Count of drop == 1: " + str(stats["count_full_ping_drop"]))
print("Obstructed: " + str(stats["count_obstructed"]))
print("Obstructed ping drop: " + str(stats["total_obstructed_ping_drop"]))
print("Obstructed drop == 1: " + str(stats["count_full_obstructed_ping_drop"]))
print("Unscheduled: " + str(stats["count_unscheduled"]))
print("Unscheduled ping drop: " + str(stats["total_unscheduled_ping_drop"]))
print("Unscheduled drop == 1: " + str(stats["count_full_unscheduled_ping_drop"]))
if run_lengths:
print("Initial drop run fragment: " + str(rl_stats["init_run_fragment"]))
print("Final drop run fragment: " + str(rl_stats["final_run_fragment"]))
print("Per-second drop runs: " + ", ".join(str(x) for x in rl_stats["run_seconds"]))
print("Per-minute drop runs: " + ", ".join(str(x) for x in rl_stats["run_minutes"]))
else:
sampleRange = chain(range(nSamples + offset - parseSamples, nSamples), range(0, offset))
for i in sampleRange:
d = historyData["popPingDropRate"][i]
tot += d
if d >= 1:
totOne += d
runLength += 1
elif runLength > 0:
if initRun is None:
initRun = runLength
csv_data = [timestamp.replace(microsecond=0).isoformat()]
csv_data.extend(str(stats[field]) for field in fields)
if run_lengths:
for field in rl_fields:
if field.startswith("run_"):
csv_data.extend(str(substat) for substat in rl_stats[field])
else:
if runLength <= 60:
secondRuns[runLength-1] += runLength
else:
minuteRuns[min((runLength-1)//60-1, 59)] += runLength
runLength = 0
elif initRun is None:
initRun = 0
if not historyData["scheduled"][i]:
totUnsched += 1
totUnschedD += d
if d >= 1:
totUnschedOne += d
# scheduled=false and obstructed=true do not ever appear to overlap,
# but in case they do in the future, treat that as just unscheduled
# in order to avoid double-counting it.
elif historyData["obstructed"][i]:
totObstruct += 1
totObstructD += d
if d >= 1:
totObstructOne += d
# If the entire sample set is one big drop run, it will be both initial
# fragment (continued from prior sample range) and final one (continued
# to next sample range), but to avoid double-reporting, just call it
# the initial run.
if initRun is None:
initRun = runLength
runLength = 0
if fVerbose:
print("Parsed samples: " + str(parseSamples))
print("Total ping drop: " + str(tot))
print("Count of drop == 1: " + str(totOne))
print("Obstructed: " + str(totObstruct))
print("Obstructed ping drop: " + str(totObstructD))
print("Obstructed drop == 1: " + str(totObstructOne))
print("Unscheduled: " + str(totUnsched))
print("Unscheduled ping drop: " + str(totUnschedD))
print("Unscheduled drop == 1: " + str(totUnschedOne))
if fRunLengths:
print("Initial drop run fragment: " + str(initRun))
print("Final drop run fragment: " + str(runLength))
print("Per-second drop runs: " + ", ".join(str(x) for x in secondRuns))
print("Per-minute drop runs: " + ", ".join(str(x) for x in minuteRuns))
else:
# NOTE: When changing data output format, also change the -H header printing above.
csvData = timestamp.replace(microsecond=0).isoformat() + "," + ",".join(str(x) for x in [parseSamples, tot, totOne, totObstruct, totObstructD, totObstructOne, totUnsched, totUnschedD, totUnschedOne])
if fRunLengths:
csvData += "," + ",".join(str(x) for x in chain([initRun, runLength], secondRuns, minuteRuns))
print(csvData)
csv_data.append(str(rl_stats[field]))
print(",".join(csv_data))

235
starlink_grpc.py Normal file
View file

@ -0,0 +1,235 @@
"""Helpers for grpc communication with a Starlink user terminal.
This module may eventually contain more expansive parsing logic, but for now
it contains functions to parse the history data for some specific packet loss
statistics.
General ping drop (packet loss) statistics:
This group of statistics characterize the packet loss (labeled "ping drop"
in the field names of the Starlink gRPC service protocol) in various ways.
The sample interval is currently 1 second.
samples: The number of valid samples analyzed.
total_ping_drop: The total amount of time, in sample intervals, that
experienced ping drop.
count_full_ping_drop: The number of samples that experienced 100%
ping drop.
count_obstructed: The number of samples that were marked as
"obstructed", regardless of whether they experienced any ping
drop.
total_obstructed_ping_drop: The total amount of time, in sample
intervals, that experienced ping drop in samples marked as
"obstructed".
count_full_obstructed_ping_drop: The number of samples that were
marked as "obstructed" and that experienced 100% ping drop.
count_unscheduled: The number of samples that were not marked as
"scheduled", regardless of whether they experienced any ping
drop.
total_unscheduled_ping_drop: The total amount of time, in sample
intervals, that experienced ping drop in samples not marked as
"scheduled".
count_full_unscheduled_ping_drop: The number of samples that were
not marked as "scheduled" and that experienced 100% ping drop.
Total packet loss ratio can be computed with total_ping_drop / samples.
Ping drop run length statistics:
This group of statistics characterizes packet loss by how long a
consecutive run of 100% packet loss lasts.
init_run_fragment: The number of consecutive sample periods at the
start of the sample set that experienced 100% ping drop. This
period may be a continuation of a run that started prior to the
sample set, so is not counted in the following stats.
final_run_fragment: The number of consecutive sample periods at the
end of the sample set that experienced 100% ping drop. This
period may continue as a run beyond the end of the sample set, so
is not counted in the following stats.
run_seconds: A 60 element list. Each element records the total amount
of time, in sample intervals, that experienced 100% ping drop in
a consecutive run that lasted for (list index + 1) sample
intervals (seconds). That is, the first element contains time
spent in 1 sample runs, the second element contains time spent in
2 sample runs, etc.
run_minutes: A 60 element list. Each element records the total amount
of time, in sample intervals, that experienced 100% ping drop in
a consecutive run that lasted for more that (list index + 1)
multiples of 60 sample intervals (minutes), but less than or equal
to (list index + 2) multiples of 60 sample intervals. Except for
the last element in the list, which records the total amount of
time in runs of more than 60*60 samples.
No sample should be counted in more than one of the run length stats or
stat elements, so the total of all of them should be equal to
count_full_ping_drop from the general stats.
Samples that experience less than 100% ping drop are not counted in this
group of stats, even if they happen at the beginning or end of a run of
100% ping drop samples. To compute the amount of time that experienced
ping loss in less than a single run of 100% ping drop, use
(total_ping_drop - count_full_ping_drop) from the general stats.
"""
from itertools import chain
import grpc
import spacex.api.device.device_pb2
import spacex.api.device.device_pb2_grpc
def history_ping_field_names():
"""Return the field names of the packet loss stats.
Returns:
A tuple with 2 lists, the first with general stat names and the
second with ping drop run length stat names.
"""
return [
"samples",
"total_ping_drop",
"count_full_ping_drop",
"count_obstructed",
"total_obstructed_ping_drop",
"count_full_obstructed_ping_drop",
"count_unscheduled",
"total_unscheduled_ping_drop",
"count_full_unscheduled_ping_drop"
], [
"init_run_fragment",
"final_run_fragment",
"run_seconds",
"run_minutes"
]
def get_history():
"""Fetch history data and return it in grpc structure format.
Raises:
grpc.RpcError: Communication or service error.
"""
with grpc.insecure_channel("192.168.100.1:9200") as channel:
stub = spacex.api.device.device_pb2_grpc.DeviceStub(channel)
response = stub.Handle(spacex.api.device.device_pb2.Request(get_history={}))
return response.dish_get_history
def history_ping_stats(parse_samples, verbose=False):
"""Fetch, parse, and compute the packet loss stats.
Args:
parse_samples (int): Number of samples to process, or -1 to parse all
available samples.
verbose (bool): Optionally produce verbose output.
Returns:
On success, a tuple with 2 dicts, the first mapping general stat names
to their values and the second mapping ping drop run length stat names
to their values.
On failure, the tuple (None, None).
"""
try:
history = get_history()
except grpc.RpcError:
if verbose:
# RpcError is too verbose to print the details.
print("Failed getting history")
return None, None
# 'current' is the count of data samples written to the ring buffer,
# irrespective of buffer wrap.
current = int(history.current)
samples = len(history.pop_ping_drop_rate)
if verbose:
print("current counter: " + str(current))
print("All samples: " + str(samples))
samples = min(samples, current)
if verbose:
print("Valid samples: " + str(samples))
# This is ring buffer offset, so both index to oldest data sample and
# index to next data sample after the newest one.
offset = current % samples
tot = 0
count_full_drop = 0
count_unsched = 0
total_unsched_drop = 0
count_full_unsched = 0
count_obstruct = 0
total_obstruct_drop = 0
count_full_obstruct = 0
second_runs = [0] * 60
minute_runs = [0] * 60
run_length = 0
init_run_length = None
if parse_samples < 0 or samples < parse_samples:
parse_samples = samples
# Parse the most recent parse_samples-sized set of samples. This will
# iterate samples in order from oldest to newest.
if parse_samples <= offset:
sample_range = range(offset - parse_samples, offset)
else:
sample_range = chain(range(samples + offset - parse_samples, samples), range(0, offset))
for i in sample_range:
d = history.pop_ping_drop_rate[i]
tot += d
if d >= 1:
count_full_drop += d
run_length += 1
elif run_length > 0:
if init_run_length is None:
init_run_length = run_length
else:
if run_length <= 60:
second_runs[run_length - 1] += run_length
else:
minute_runs[min((run_length - 1)//60 - 1, 59)] += run_length
run_length = 0
elif init_run_length is None:
init_run_length = 0
if not history.scheduled[i]:
count_unsched += 1
total_unsched_drop += d
if d >= 1:
count_full_unsched += d
# scheduled=false and obstructed=true do not ever appear to overlap,
# but in case they do in the future, treat that as just unscheduled
# in order to avoid double-counting it.
elif history.obstructed[i]:
count_obstruct += 1
total_obstruct_drop += d
if d >= 1:
count_full_obstruct += d
# If the entire sample set is one big drop run, it will be both initial
# fragment (continued from prior sample range) and final one (continued
# to next sample range), but to avoid double-reporting, just call it
# the initial run.
if init_run_length is None:
init_run_length = run_length
run_length = 0
return {
"samples": parse_samples,
"total_ping_drop": tot,
"count_full_ping_drop": count_full_drop,
"count_obstructed": count_obstruct,
"total_obstructed_ping_drop": total_obstruct_drop,
"count_full_obstructed_ping_drop": count_full_obstruct,
"count_unscheduled": count_unsched,
"total_unscheduled_ping_drop": total_unsched_drop,
"count_full_unscheduled_ping_drop": count_full_unsched
}, {
"init_run_fragment": init_run_length,
"final_run_fragment": run_length,
"run_seconds": second_runs,
"run_minutes": minute_runs
}

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"""Parser for JSON format gRPC output from a Starlink user terminal.
Expects input as from grpcurl get_history request.
Handling output for other request responses may be added in the future, but
the others don't really need as much interpretation as the get_history
response does.
See the starlink_grpc module docstring for descriptions of the stat elements.
"""
import json
import sys
from itertools import chain
def history_ping_field_names():
"""Return the field names of the packet loss stats.
Returns:
A tuple with 2 lists, the first with general stat names and the
second with ping drop run length stat names.
"""
return [
"samples",
"total_ping_drop",
"count_full_ping_drop",
"count_obstructed",
"total_obstructed_ping_drop",
"count_full_obstructed_ping_drop",
"count_unscheduled",
"total_unscheduled_ping_drop",
"count_full_unscheduled_ping_drop"
], [
"init_run_fragment",
"final_run_fragment",
"run_seconds",
"run_minutes"
]
def get_history(filename):
"""Read JSON data and return the raw history in dict format.
Args:
filename (str): Filename from which to read JSON data, or "-" to read
from standard input.
"""
if filename == "-":
json_data = json.load(sys.stdin)
else:
json_file = open(filename)
try:
json_data = json.load(json_file)
finally:
json_file.close()
return json_data["dishGetHistory"]
def history_ping_stats(filename, parse_samples, verbose=False):
"""Fetch, parse, and compute the packet loss stats.
Args:
filename (str): Filename from which to read JSON data, or "-" to read
from standard input.
parse_samples (int): Number of samples to process, or -1 to parse all
available samples.
verbose (bool): Optionally produce verbose output.
Returns:
On success, a tuple with 2 dicts, the first mapping general stat names
to their values and the second mapping ping drop run length stat names
to their values.
On failure, the tuple (None, None).
"""
try:
history = get_history(filename)
except Exception as e:
if verbose:
print("Failed getting history: " + str(e))
return None, None
# "current" is the count of data samples written to the ring buffer,
# irrespective of buffer wrap.
current = int(history["current"])
samples = len(history["popPingDropRate"])
if verbose:
print("current counter: " + str(current))
print("All samples: " + str(samples))
samples = min(samples, current)
if verbose:
print("Valid samples: " + str(samples))
# This is ring buffer offset, so both index to oldest data sample and
# index to next data sample after the newest one.
offset = current % samples
tot = 0
count_full_drop = 0
count_unsched = 0
total_unsched_drop = 0
count_full_unsched = 0
count_obstruct = 0
total_obstruct_drop = 0
count_full_obstruct = 0
second_runs = [0] * 60
minute_runs = [0] * 60
run_length = 0
init_run_length = None
if parse_samples < 0 or samples < parse_samples:
parse_samples = samples
# Parse the most recent parse_samples-sized set of samples. This will
# iterate samples in order from oldest to newest.
if parse_samples <= offset:
sample_range = range(offset - parse_samples, offset)
else:
sample_range = chain(range(samples + offset - parse_samples, samples), range(0, offset))
for i in sample_range:
d = history["popPingDropRate"][i]
tot += d
if d >= 1:
count_full_drop += d
run_length += 1
elif run_length > 0:
if init_run_length is None:
init_run_length = run_length
else:
if run_length <= 60:
second_runs[run_length - 1] += run_length
else:
minute_runs[min((run_length - 1)//60 - 1, 59)] += run_length
run_length = 0
elif init_run_length is None:
init_run_length = 0
if not history["scheduled"][i]:
count_unsched += 1
total_unsched_drop += d
if d >= 1:
count_full_unsched += d
# scheduled=false and obstructed=true do not ever appear to overlap,
# but in case they do in the future, treat that as just unscheduled
# in order to avoid double-counting it.
elif history["obstructed"][i]:
count_obstruct += 1
total_obstruct_drop += d
if d >= 1:
count_full_obstruct += d
# If the entire sample set is one big drop run, it will be both initial
# fragment (continued from prior sample range) and final one (continued
# to next sample range), but to avoid double-reporting, just call it
# the initial run.
if init_run_length is None:
init_run_length = run_length
run_length = 0
return {
"samples": parse_samples,
"total_ping_drop": tot,
"count_full_ping_drop": count_full_drop,
"count_obstructed": count_obstruct,
"total_obstructed_ping_drop": total_obstruct_drop,
"count_full_obstructed_ping_drop": count_full_obstruct,
"count_unscheduled": count_unsched,
"total_unscheduled_ping_drop": total_unsched_drop,
"count_full_unscheduled_ping_drop": count_full_unsched
}, {
"init_run_fragment": init_run_length,
"final_run_fragment": run_length,
"run_seconds": second_runs,
"run_minutes": minute_runs
}