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3bce9c97f8
...and propagation.HeaderCarrier to adapt http.Header to this interface. Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package propagation_test
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import (
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"context"
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"strings"
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"testing"
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"go.opentelemetry.io/otel/propagation"
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)
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type ctxKeyType uint
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var (
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ctxKey ctxKeyType = 0
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)
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type carrier []string
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func (c *carrier) Keys() []string { return nil }
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func (c *carrier) Get(string) string { return "" }
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func (c *carrier) Set(setter, _ string) {
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*c = append(*c, setter)
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}
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type propagator struct {
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Name string
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}
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func (p propagator) Inject(ctx context.Context, carrier propagation.TextMapCarrier) {
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carrier.Set(p.Name, "")
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}
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func (p propagator) Extract(ctx context.Context, carrier propagation.TextMapCarrier) context.Context {
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v := ctx.Value(ctxKey)
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if v == nil {
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ctx = context.WithValue(ctx, ctxKey, []string{p.Name})
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} else {
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orig := v.([]string)
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ctx = context.WithValue(ctx, ctxKey, append(orig, p.Name))
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}
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return ctx
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}
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func (p propagator) Fields() []string { return []string{p.Name} }
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func TestCompositeTextMapPropagatorFields(t *testing.T) {
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a, b1, b2 := propagator{"a"}, propagator{"b"}, propagator{"b"}
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want := map[string]struct{}{
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"a": {},
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"b": {},
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}
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got := propagation.NewCompositeTextMapPropagator(a, b1, b2).Fields()
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if len(got) != len(want) {
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t.Fatalf("invalid fields from composite: %v (want %v)", got, want)
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}
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for _, v := range got {
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if _, ok := want[v]; !ok {
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t.Errorf("invalid field returned from composite: %q", v)
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}
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}
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}
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func TestCompositeTextMapPropagatorInject(t *testing.T) {
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a, b := propagator{"a"}, propagator{"b"}
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c := make(carrier, 0, 2)
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propagation.NewCompositeTextMapPropagator(a, b).Inject(context.Background(), &c)
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if got := strings.Join([]string(c), ","); got != "a,b" {
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t.Errorf("invalid inject order: %s", got)
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}
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}
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func TestCompositeTextMapPropagatorExtract(t *testing.T) {
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a, b := propagator{"a"}, propagator{"b"}
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ctx := context.Background()
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ctx = propagation.NewCompositeTextMapPropagator(a, b).Extract(ctx, nil)
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v := ctx.Value(ctxKey)
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if v == nil {
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t.Fatal("no composite extraction")
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}
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if got := strings.Join(v.([]string), ","); got != "a,b" {
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t.Errorf("invalid extract order: %s", got)
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}
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}
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