API for propagation of context.
The propagators for the opentelemetry.propagators.composite.CompositePropagator can be defined via configuration in the OTEL_PROPAGATORS environment variable. This variable should be set to a comma-separated string of names of values for the opentelemetry_propagator entry point. For example, setting OTEL_PROPAGATORS to tracecontext,baggage (which is the default value) would instantiate opentelemetry.propagators.composite.CompositePropagator with 2 propagators, one of type opentelemetry.trace.propagation.tracecontext.TraceContextTextMapPropagator and other of type opentelemetry.baggage.propagation.W3CBaggagePropagator. Notice that these propagator classes are defined as opentelemetry_propagator entry points in the pyproject.toml file of opentelemetry.
Example:
import flask
import requests
from opentelemetry import propagate
PROPAGATOR = propagate.get_global_textmap()
def get_header_from_flask_request(request, key):
return request.headers.get_all(key)
def set_header_into_requests_request(request: requests.Request,
key: str, value: str):
request.headers[key] = value
def example_route():
context = PROPAGATOR.extract(
get_header_from_flask_request,
flask.request
)
request_to_downstream = requests.Request(
"GET", "http://httpbin.org/get"
)
PROPAGATOR.inject(
set_header_into_requests_request,
request_to_downstream,
context=context
)
session = requests.Session()
session.send(request_to_downstream.prepare())
Uses the configured propagator to extract a Context from the carrier.
getter (Getter[TypeVar(CarrierT)]) – an object which contains a get function that can retrieve zero or more values from the carrier and a keys function that can get all the keys from carrier.
carrier (TypeVar(CarrierT)) – and object which contains values that are used to construct a Context. This object must be paired with an appropriate getter which understands how to extract a value from it.
context (Optional[Context]) – an optional Context to use. Defaults to root context if not set.
Uses the configured propagator to inject a Context into the carrier.
carrier (TypeVar(CarrierT)) – the medium used by Propagators to read values from and write values to. Should be paired with setter, which should know how to set header values on the carrier.
context (Optional[Context]) – An optional Context to use. Defaults to current context if not set.
setter (Setter[TypeVar(CarrierT)]) – An optional Setter object that can set values on the carrier.
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