feat: initial tracing support (#1623)

vendor/go.opentelemetry.io/otel/propagation.go

@@ -0,0 +1,31 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package otel // import "go.opentelemetry.io/otel"
+
+import (
+	"go.opentelemetry.io/otel/internal/global"
+	"go.opentelemetry.io/otel/propagation"
+)
+
+// GetTextMapPropagator returns the global TextMapPropagator. If none has been
+// set, a No-Op TextMapPropagator is returned.
+func GetTextMapPropagator() propagation.TextMapPropagator {
+	return global.TextMapPropagator()
+}
+
+// SetTextMapPropagator sets propagator as the global TextMapPropagator.
+func SetTextMapPropagator(propagator propagation.TextMapPropagator) {
+	global.SetTextMapPropagator(propagator)
+}