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# Copyright 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
try:
# Note: from tracing.proto import histogram_pb2 would make more sense here,
# but unfortunately protoc does not generate __init__.py files if you specify
# an out package (at least for the gn proto_library rule).
import histogram_pb2 # pylint:disable=relative-import
HAS_PROTO = True
except ImportError:
HAS_PROTO = False
def _EnsureProto():
"""Ensures histogram_pb.py is in the PYTHONPATH.
If the assert fails here, it means your script doesn't ensure histogram_pb2.py
is generated and is in the PYTHONPATH. To fix this, depend on the GN rule
in BUILD.gn and ensure the script gets the out/Whatever/pyproto dir in its
PYTHONPATH (for instance by making your script take a --out-dir=out/Whatever
flag).
"""
assert HAS_PROTO, ('Tried to use histogram protos, but missing '
'histogram_pb2.py. Try cd tracing/proto && make.')
def Pb2():
"""Resolves the histogram proto stub.
Where you would use histogram_pb2.X, instead do histogram_proto.Pb2().X.
"""
_EnsureProto()
return histogram_pb2
if HAS_PROTO:
PROTO_UNIT_MAP = {
histogram_pb2.MS: 'ms',
histogram_pb2.MS_BEST_FIT_FORMAT: 'msBestFitFormat',
histogram_pb2.TS_MS: 'tsMs',
histogram_pb2.N_PERCENT: 'n%',
histogram_pb2.SIZE_IN_BYTES: 'sizeInBytes',
histogram_pb2.BYTES_PER_SECOND: 'bytesPerSecond',
histogram_pb2.J: 'J',
histogram_pb2.W: 'W',
histogram_pb2.A: 'A',
histogram_pb2.V: 'V',
histogram_pb2.HERTZ: 'Hz',
histogram_pb2.UNITLESS: 'unitless',
histogram_pb2.COUNT: 'count',
histogram_pb2.SIGMA: 'sigma',
}
UNIT_PROTO_MAP = {v: k for k, v in PROTO_UNIT_MAP.iteritems()}
PROTO_IMPROVEMENT_DIRECTION_MAP = {
histogram_pb2.BIGGER_IS_BETTER: 'biggerIsBetter',
histogram_pb2.SMALLER_IS_BETTER: 'smallerIsBetter',
}
IMPROVEMENT_DIRECTION_PROTO_MAP = {
v: k for k, v in PROTO_IMPROVEMENT_DIRECTION_MAP.iteritems()
}
def UnitFromProto(proto_unit):
_EnsureProto()
direction = proto_unit.improvement_direction
unit = PROTO_UNIT_MAP[proto_unit.unit]
if direction and direction != histogram_pb2.NOT_SPECIFIED:
unit += '_' + PROTO_IMPROVEMENT_DIRECTION_MAP[direction]
return unit
def ProtoFromUnit(unit):
_EnsureProto()
parts = unit.split('_')
assert unit
assert 0 < len(parts) <= 2, ('expected <unit>_(bigger|smaller)IsBetter' +
str(parts))
proto_unit = histogram_pb2.UnitAndDirection()
proto_unit.unit = UNIT_PROTO_MAP[parts[0]]
if len(parts) > 1:
proto_unit.improvement_direction = IMPROVEMENT_DIRECTION_PROTO_MAP[parts[1]]
return proto_unit
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