def __init__(self, tchannel=None, dst=None, sample_rate=None):
"""Log zipkin style trace.
:param tchannel:
The tchannel instance to send zipkin trace spans
:param dst:
The destination to output trace information
:param sample_rate:
The sample_rate determines the probability that the trace span
been sampled.
The rate of sampling is in the range [0, 1] with 0.01 precision.
By default it takes 100% sampling.
"""
if tchannel:
# TChannelZipkinTracer generates Base64-encoded span
# and uploads to zipkin server
self.tracer = TChannelZipkinTracer(tchannel)
else:
# DebugTracer generates json style span info and writes
# to dst. By default it writes to stdout
self.tracer = DebugTracer(dst)
if sample_rate is None:
sample_rate = self.DEFAULT_RATE
assert 0 <= sample_rate <= 1
self.rate = sample_rate
self._check_point = self.rate * (1 << 64)
def __init__(self, tchannel=None, dst=None):
"""Log zipkin style trace.
:param tchannel:
The tchannel instance to send zipkin trace spans
:param dst:
The destination to output trace information
"""
if tchannel:
# TChannelZipkinTracer generates Base64-encoded span
# and uploads to zipkin server
self.tracer = TChannelZipkinTracer(tchannel)
else:
# DebugTracer generates json style span info and writes
# to dst. By default it writes to stdout
self.tracer = DebugTracer(dst)
