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#!/usr/bin/env python
from rediscache import RedisCache
from opentelemetry import trace
from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import (
OTLPSpanExporter,
)
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.shim import opentracing_shim
# Configure the tracer using the default implementation
trace.set_tracer_provider(TracerProvider())
tracer_provider = trace.get_tracer_provider()
# Create an OTLP gRPC span exporter
otlp_exporter = OTLPSpanExporter(
endpoint="http://localhost:4317",
# For insecure connection, useful for testing
insecure=True,
)
# Add the exporter to the tracer provider
trace.get_tracer_provider().add_span_processor(
BatchSpanProcessor(otlp_exporter)
)
# Create an OpenTracing shim. This implements the OpenTracing tracer API, but
# forwards calls to the underlying OpenTelemetry tracer.
opentracing_tracer = opentracing_shim.create_tracer(tracer_provider)
# Our example caching library expects an OpenTracing-compliant tracer.
redis_cache = RedisCache(opentracing_tracer)
# Application code uses an OpenTelemetry Tracer as usual.
tracer = trace.get_tracer(__name__)
@redis_cache
def fib(number):
"""Get the Nth Fibonacci number, cache intermediate results in Redis."""
if number < 0:
raise ValueError
if number in (0, 1):
return number
return fib(number - 1) + fib(number - 2)
with tracer.start_as_current_span("Fibonacci") as span:
span.set_attribute("is_example", "yes :)")
fib(4)
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