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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoprop_test
import (
"fmt"
"os"
"sort"
"go.opentelemetry.io/contrib/propagators/autoprop"
"go.opentelemetry.io/contrib/propagators/b3"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
)
func ExampleNewTextMapPropagator() {
// NewTextMapPropagator returns a TraceContext and Baggage propagator by
// default. The response of this function can be directly registered with
// the go.opentelemetry.io/otel package.
otel.SetTextMapPropagator(autoprop.NewTextMapPropagator())
fields := otel.GetTextMapPropagator().Fields()
sort.Strings(fields)
fmt.Println(fields)
// Output: [baggage traceparent tracestate]
}
func ExampleNewTextMapPropagator_arguments() {
// NewTextMapPropagator behaves the same as the
// NewCompositeTextMapPropagator function in the
// go.opentelemetry.io/otel/propagation package when TextMapPropagator are
// passed as arguments.
fields := autoprop.NewTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
b3.New(),
).Fields()
sort.Strings(fields)
fmt.Println(fields)
// Output: [baggage traceparent tracestate x-b3-flags x-b3-sampled x-b3-spanid x-b3-traceid]
}
func ExampleNewTextMapPropagator_environment() {
// Propagators set for the OTEL_PROPAGATORS environment variable take
// precedence and will override any arguments passed to
// NewTextMapPropagator.
_ = os.Setenv("OTEL_PROPAGATORS", "b3,baggage")
// Returns only a B3 and Baggage TextMapPropagator (i.e. does not include
// TraceContext).
fields := autoprop.NewTextMapPropagator(propagation.TraceContext{}).Fields()
sort.Strings(fields)
fmt.Println(fields)
// Output: [baggage x-b3-flags x-b3-sampled x-b3-spanid x-b3-traceid]
}
type myTextMapPropagator struct{ propagation.TextMapPropagator }
func (myTextMapPropagator) Fields() []string {
return []string{"my-header-val"}
}
func ExampleRegisterTextMapPropagator() {
// To use your own or a 3rd-party exporter via the OTEL_PROPAGATORS
// environment variable, it needs to be registered prior to calling
// NewTextMapPropagator.
autoprop.RegisterTextMapPropagator("custom-prop", myTextMapPropagator{})
_ = os.Setenv("OTEL_PROPAGATORS", "custom-prop")
fmt.Println(autoprop.NewTextMapPropagator().Fields())
// Output: [my-header-val]
}
func ExampleGetTextMapPropagator() {
prop, err := autoprop.TextMapPropagator("b3", "baggage")
if err != nil {
// Handle error appropriately.
panic(err)
}
fields := prop.Fields()
sort.Strings(fields)
fmt.Println(fields)
// Output: [baggage x-b3-flags x-b3-sampled x-b3-spanid x-b3-traceid]
}
func ExampleGetTextMapPropagator_custom() {
// To use your own or a 3rd-party exporter it needs to be registered prior
// to calling GetTextMapPropagator.
autoprop.RegisterTextMapPropagator("custom-get-prop", myTextMapPropagator{})
prop, err := autoprop.TextMapPropagator("custom-get-prop")
if err != nil {
// Handle error appropriately.
panic(err)
}
fmt.Println(prop.Fields())
// Output: [my-header-val]
}
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