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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package propagation_test
import (
"context"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
const (
traceIDStr = "4bf92f3577b34da6a3ce929d0e0e4736"
spanIDStr = "00f067aa0ba902b7"
)
var (
traceID = mustTraceIDFromHex(traceIDStr)
spanID = mustSpanIDFromHex(spanIDStr)
)
func mustTraceIDFromHex(s string) (t trace.TraceID) {
var err error
t, err = trace.TraceIDFromHex(s)
if err != nil {
panic(err)
}
return
}
func mustSpanIDFromHex(s string) (t trace.SpanID) {
var err error
t, err = trace.SpanIDFromHex(s)
if err != nil {
panic(err)
}
return
}
type outOfThinAirPropagator struct {
t *testing.T
}
var _ propagation.TextMapPropagator = outOfThinAirPropagator{}
func (p outOfThinAirPropagator) Extract(ctx context.Context, carrier propagation.TextMapCarrier) context.Context {
sc := trace.NewSpanContext(trace.SpanContextConfig{
TraceID: traceID,
SpanID: spanID,
TraceFlags: 0,
})
require.True(p.t, sc.IsValid())
return trace.ContextWithRemoteSpanContext(ctx, sc)
}
func (outOfThinAirPropagator) Inject(context.Context, propagation.TextMapCarrier) {}
func (outOfThinAirPropagator) Fields() []string {
return nil
}
type nilCarrier struct{}
var _ propagation.TextMapCarrier = nilCarrier{}
func (nilCarrier) Keys() []string {
return nil
}
func (nilCarrier) Get(key string) string {
return ""
}
func (nilCarrier) Set(key string, value string) {}
func TestMultiplePropagators(t *testing.T) {
ootaProp := outOfThinAirPropagator{t: t}
ns := nilCarrier{}
testProps := []propagation.TextMapPropagator{
propagation.TraceContext{},
}
bg := context.Background()
// sanity check of oota propagator, ensuring that it really
// generates the valid span context out of thin air
{
ctx := ootaProp.Extract(bg, ns)
sc := trace.SpanContextFromContext(ctx)
require.True(t, sc.IsValid(), "oota prop failed sanity check")
require.True(t, sc.IsRemote(), "oota prop is remote")
}
// sanity check for real propagators, ensuring that they
// really are not putting any valid span context into an empty
// go context in absence of the HTTP headers.
for _, prop := range testProps {
ctx := prop.Extract(bg, ns)
sc := trace.SpanContextFromContext(ctx)
require.Falsef(t, sc.IsValid(), "%#v failed sanity check", prop)
require.Falsef(t, sc.IsRemote(), "%#v prop set a remote", prop)
}
for _, prop := range testProps {
props := propagation.NewCompositeTextMapPropagator(ootaProp, prop)
ctx := props.Extract(bg, ns)
sc := trace.SpanContextFromContext(ctx)
assert.Truef(t, sc.IsRemote(), "%#v prop is remote", prop)
assert.Truef(t, sc.IsValid(), "%#v clobbers span context", prop)
}
}
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