1 // Copyright The OpenTelemetry Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package otel // import "go.opentelemetry.io/otel" 16 17 import ( 18 "go.opentelemetry.io/otel/internal/global" 19 "go.opentelemetry.io/otel/trace" 20 ) 21 22 // Tracer creates a named tracer that implements Tracer interface. 23 // If the name is an empty string then provider uses default name. 24 // 25 // This is short for GetTracerProvider().Tracer(name, opts...) 26 func Tracer(name string, opts ...trace.TracerOption) trace.Tracer { 27 return GetTracerProvider().Tracer(name, opts...) 28 } 29 30 // GetTracerProvider returns the registered global trace provider. 31 // If none is registered then an instance of NoopTracerProvider is returned. 32 // 33 // Use the trace provider to create a named tracer. E.g. 34 // 35 // tracer := otel.GetTracerProvider().Tracer("example.com/foo") 36 // 37 // or 38 // 39 // tracer := otel.Tracer("example.com/foo") 40 func GetTracerProvider() trace.TracerProvider { 41 return global.TracerProvider() 42 } 43 44 // SetTracerProvider registers `tp` as the global trace provider. 45 func SetTracerProvider(tp trace.TracerProvider) { 46 global.SetTracerProvider(tp) 47 } 48