Merge branch 'master' into patch-1

CHANGELOG.md

@@ -39,7 +39,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Move the `Number` type (together with related functions) from `go.opentelemetry.io/otel/api/metric` package into `go.opentelemetry.io/otel/metric/number` as a part of #1303. (#1316)
 - The function signature of the Span `AddEvent` method in `go.opentelemetry.io/otel` is updated to no longer take an unused context and instead take a required name and a variable number of `EventOption`s. (#1254)
 - The function signature of the Span `RecordError` method in `go.opentelemetry.io/otel` is updated to no longer take an unused context and instead take a required error value and a variable number of `EventOption`s. (#1254)
-- Move the `go.opentelemetry.io/otel/api/global` package to `go.opentelemetry.io/otel/global`. (#1262)
+- Move the `go.opentelemetry.io/otel/api/global` package to `go.opentelemetry.io/otel`. (#1262) (#1330)
+- Move the `Version` function from `go.opentelemetry.io/otel/sdk` to `go.opentelemetry.io/otel`. (#1330)
 - Rename correlation context header from `"otcorrelations"` to `"baggage"` to match the OpenTelemetry specification. (#1267)
 - Fix `Code.UnmarshalJSON` to work with valid json only. (#1276)
 - The `resource.New()` method changes signature to support builtin attributes and functional options, including `telemetry.sdk.*` and

bridge/opencensus/bridge.go

@@ -20,8 +20,8 @@ import (
 
 	octrace "go.opencensus.io/trace"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/codes"
-	"go.opentelemetry.io/otel/global"
 	"go.opentelemetry.io/otel/label"
 	"go.opentelemetry.io/otel/trace"
 )
@@ -60,7 +60,7 @@ func convertStartOptions(optFns []octrace.StartOption, name string) []trace.Span
 	}
 
 	if ocOpts.Sampler != nil {
-		global.Handle(fmt.Errorf("ignoring custom sampler for span %q created by OpenCensus because OpenTelemetry does not support creating a span with a custom sampler", name))
+		otel.Handle(fmt.Errorf("ignoring custom sampler for span %q created by OpenCensus because OpenTelemetry does not support creating a span with a custom sampler", name))
 	}
 	return otOpts
 }
@@ -81,7 +81,7 @@ func (o *otelTracer) NewContext(parent context.Context, s *octrace.Span) context
 	if otSpan, ok := s.Internal().(*span); ok {
 		return trace.ContextWithSpan(parent, otSpan.otSpan)
 	}
-	global.Handle(fmt.Errorf("unable to create context with span %q, since it was created using a different tracer", s.String()))
+	otel.Handle(fmt.Errorf("unable to create context with span %q, since it was created using a different tracer", s.String()))
 	return parent
 }
 
@@ -181,7 +181,7 @@ func (s *span) AddMessageReceiveEvent(messageID, uncompressedByteSize, compresse
 }
 
 func (s *span) AddLink(l octrace.Link) {
-	global.Handle(fmt.Errorf("ignoring OpenCensus link %+v for span %q because OpenTelemetry doesn't support setting links after creation", l, s.String()))
+	otel.Handle(fmt.Errorf("ignoring OpenCensus link %+v for span %q because OpenTelemetry doesn't support setting links after creation", l, s.String()))
 }
 
 func (s *span) String() string {
@@ -190,7 +190,7 @@ func (s *span) String() string {
 
 func otelSpanContextToOc(sc trace.SpanContext) octrace.SpanContext {
 	if sc.IsDebug() || sc.IsDeferred() {
-		global.Handle(fmt.Errorf("ignoring OpenTelemetry Debug or Deferred trace flags for span %q because they are not supported by OpenCensus", sc.SpanID))
+		otel.Handle(fmt.Errorf("ignoring OpenTelemetry Debug or Deferred trace flags for span %q because they are not supported by OpenCensus", sc.SpanID))
 	}
 	var to octrace.TraceOptions
 	if sc.IsSampled() {

bridge/opencensus/go.sum

@@ -10,8 +10,8 @@ github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
-github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

bridge/opentracing/bridge.go

@@ -25,9 +25,9 @@ import (
 	otext "github.com/opentracing/opentracing-go/ext"
 	otlog "github.com/opentracing/opentracing-go/log"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/bridge/opentracing/migration"
 	"go.opentelemetry.io/otel/codes"
-	otelglobal "go.opentelemetry.io/otel/global"
 	"go.opentelemetry.io/otel/internal/baggage"
 	"go.opentelemetry.io/otel/internal/trace/noop"
 	otelparent "go.opentelemetry.io/otel/internal/trace/parent"
@@ -654,5 +654,5 @@ func (t *BridgeTracer) getPropagator() propagation.TextMapPropagator {
 	if t.propagator != nil {
 		return t.propagator
 	}
-	return otelglobal.TextMapPropagator()
+	return otel.GetTextMapPropagator()
 }

bridge/opentracing/go.sum

@@ -1,7 +1,7 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
-github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/opentracing/opentracing-go v1.2.0 h1:uEJPy/1a5RIPAJ0Ov+OIO8OxWu77jEv+1B0VhjKrZUs=
 github.com/opentracing/opentracing-go v1.2.0/go.mod h1:GxEUsuufX4nBwe+T+Wl9TAgYrxe9dPLANfrWvHYVTgc=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

bridge/opentracing/mix_test.go

@@ -21,7 +21,7 @@ import (
 
 	ot "github.com/opentracing/opentracing-go"
 
-	otelglobal "go.opentelemetry.io/otel/global"
+	"go.opentelemetry.io/otel"
 	otelbaggage "go.opentelemetry.io/otel/internal/baggage"
 	"go.opentelemetry.io/otel/label"
 	"go.opentelemetry.io/otel/trace"
@@ -130,7 +130,7 @@ func TestMixedAPIs(t *testing.T) {
 			t.Log(msg)
 		})
 
-		otelglobal.SetTracerProvider(otelProvider)
+		otel.SetTracerProvider(otelProvider)
 		ot.SetGlobalTracer(otTracer)
 
 		tc.setup(t, mockOtelTracer)
@@ -440,7 +440,7 @@ func (tm *tracerMessTest) setup(t *testing.T, tracer *internal.MockTracer) {
 
 func (tm *tracerMessTest) check(t *testing.T, tracer *internal.MockTracer) {
 	globalOtTracer := ot.GlobalTracer()
-	globalOtelTracer := otelglobal.Tracer("")
+	globalOtelTracer := otel.Tracer("")
 	if len(tm.recordedOTSpanTracers) != 3 {
 		t.Errorf("Expected 3 recorded OpenTracing tracers from spans, got %d", len(tm.recordedOTSpanTracers))
 	}
@@ -684,7 +684,7 @@ func min(a, b int) int {
 }
 
 func runOtelOTOtel(t *testing.T, ctx context.Context, name string, callback func(*testing.T, context.Context) context.Context) {
-	tr := otelglobal.Tracer("")
+	tr := otel.Tracer("")
 	ctx, span := tr.Start(ctx, fmt.Sprintf("%s_Otel_OTOtel", name), trace.WithSpanKind(trace.SpanKindClient))
 	defer span.End()
 	ctx = callback(t, ctx)
@@ -701,7 +701,7 @@ func runOtelOTOtel(t *testing.T, ctx context.Context, name string, callback func
 }
 
 func runOTOtelOT(t *testing.T, ctx context.Context, name string, callback func(*testing.T, context.Context) context.Context) {
-	tr := otelglobal.Tracer("")
+	tr := otel.Tracer("")
 	span, ctx := ot.StartSpanFromContext(ctx, fmt.Sprintf("%s_OT_OtelOT", name), ot.Tag{Key: "span.kind", Value: "client"})
 	defer span.Finish()
 	ctx = callback(t, ctx)

doc.go

@@ -12,112 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-/*
-Package otel provides an implementation of the OpenTelemetry API.
-
-This package is currently in a pre-GA phase. Backwards incompatible changes
-may be introduced in subsequent minor version releases as we work to track the
-evolving OpenTelemetry specification and user feedback.
-
-The provided API is used to instrument code and measure data about that code's
-performance and operation. The measured data, by default, is not processed or
-transmitted anywhere. An implementation of the OpenTelemetry SDK, like the
-default SDK implementation (go.opentelemetry.io/otel/sdk), and associated
-exporters are used to process and transport this data.
-
-Tracing
-
-To participate in distributed traces a Span needs to be created for the
-operation being performed as part of a traced workflow. It its simplest form:
-
-	var tracer otel.Tracer
-
-	func init() {
-		tracer = global.Tracer("instrumentation/package/name")
-	}
-
-	func operation(ctx context.Context) {
-		var span trace.Span
-		ctx, span = tracer.Start(ctx, "operation")
-		defer span.End()
-		// ...
-	}
-
-A Tracer is unique to the instrumentation and is used to create Spans.
-Instrumentation should be designed to accept a TracerProvider from which it
-can create its own unique Tracer. Alternatively, the registered global
-TracerProvider from the go.opentelemetry.io/otel/global package can be used as
-a default.
-
-	const (
-		name    = "instrumentation/package/name"
-		version = "0.1.0"
-	)
-
-	type Instrumentation struct {
-		tracer otel.Tracer
-	}
-
-	func NewInstrumentation(tp otel.TracerProvider) *Instrumentation {
-		if tp == nil {
-			tp := global.TracerProvider()
-		}
-		return &Instrumentation{
-			tracer: tp.Tracer(name, otel.WithTracerVersion(version)),
-		}
-	}
-
-	func operation(ctx context.Context, inst *Instrumentation) {
-		var span trace.Span
-		ctx, span = inst.tracer.Start(ctx, "operation")
-		defer span.End()
-		// ...
-	}
-
-Metric Measurements
-
-Measurements can be made about an operation being performed or the state of a
-system in general. These measurements can be crucial to the reliable operation
-of code and provide valuable insights about the inner workings of a system.
-
-Measurements are made using instruments provided by this package. The type of
-instrument used will depend on the type of measurement being made and of what
-part of a system is being measured.
-
-Instruments are categorized as Synchronous or Asynchronous and independently
-as Adding or Grouping. Synchronous instruments are called by the user with a
-Context. Asynchronous instruments are called by the SDK during collection.
-Additive instruments are semantically intended for capturing a sum. Grouping
-instruments are intended for capturing a distribution.
-
-Additive instruments may be monotonic, in which case they are non-decreasing
-and naturally define a rate.
-
-The synchronous instrument names are:
-
-  Counter:           additive, monotonic
-  UpDownCounter:     additive
-  ValueRecorder:     grouping
-
-and the asynchronous instruments are:
-
-  SumObserver:       additive, monotonic
-  UpDownSumObserver: additive
-  ValueObserver:     grouping
-
-All instruments are provided with support for either float64 or int64 input
-values.
-
-An instrument is created using a Meter. Additionally, a Meter is used to
-record batches of synchronous measurements or asynchronous observations. A
-Meter is obtained using a MeterProvider. A Meter, like a Tracer, is unique to
-the instrumentation it instruments and must be named and versioned when
-created with a MeterProvider with the name and version of the instrumentation
-library.
-
-Instrumentation should be designed to accept a MeterProvider from which it can
-create its own unique Meter. Alternatively, the registered global
-MeterProvider from the go.opentelemetry.io/otel/api/global package can be used
-as a default.
-*/
+// Package global provides global providers, propagators and more.
+//
+// This package is currently in a pre-GA phase. Backwards incompatible changes
+// may be introduced in subsequent minor version releases as we work to track
+// the evolving OpenTelemetry specification and user feedback.
 package otel // import "go.opentelemetry.io/otel"

example/basic/go.sum

@@ -4,8 +4,8 @@ github.com/benbjohnson/clock v1.0.3 h1:vkLuvpK4fmtSCuo60+yC63p7y0BmQ8gm5ZXGuBCJy
 github.com/benbjohnson/clock v1.0.3/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
-github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.1.0 h1:Hsa8mG0dQ46ij8Sl2AYJDUv1oA9/d6Vk+3LG99Oe02g=
 github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

example/basic/main.go

@@ -18,9 +18,9 @@ import (
 	"context"
 	"log"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/baggage"
 	"go.opentelemetry.io/otel/exporters/stdout"
-	"go.opentelemetry.io/otel/global"
 	"go.opentelemetry.io/otel/label"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/propagation"
@@ -59,13 +59,13 @@ func main() {
 	)
 	pusher.Start()
 	defer pusher.Stop()
-	global.SetTracerProvider(tp)
-	global.SetMeterProvider(pusher.MeterProvider())
+	otel.SetTracerProvider(tp)
+	otel.SetMeterProvider(pusher.MeterProvider())
 
 	// set global propagator to baggage (the default is no-op).
-	global.SetTextMapPropagator(propagation.Baggage{})
-	tracer := global.Tracer("ex.com/basic")
-	meter := global.Meter("ex.com/basic")
+	otel.SetTextMapPropagator(propagation.Baggage{})
+	tracer := otel.Tracer("ex.com/basic")
+	meter := otel.Meter("ex.com/basic")
 
 	commonLabels := []label.KeyValue{lemonsKey.Int(10), label.String("A", "1"), label.String("B", "2"), label.String("C", "3")}
 

example/jaeger/go.sum

@@ -89,6 +89,8 @@ github.com/google/go-cmp v0.5.1 h1:JFrFEBb2xKufg6XkJsJr+WbKb4FQlURi5RUcBveYu9k=
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/martian/v3 v3.0.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=

example/jaeger/main.go

@@ -20,7 +20,7 @@ import (
 	"context"
 	"log"
 
-	"go.opentelemetry.io/otel/global"
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/label"
 
 	"go.opentelemetry.io/otel/exporters/trace/jaeger"
@@ -53,15 +53,15 @@ func main() {
 	flush := initTracer()
 	defer flush()
 
-	tr := global.Tracer("component-main")
+	tr := otel.Tracer("component-main")
 	ctx, span := tr.Start(ctx, "foo")
 	defer span.End()
 
 	bar(ctx)
 }
 
 func bar(ctx context.Context) {
-	tr := global.Tracer("component-bar")
+	tr := otel.Tracer("component-bar")
 	_, span := tr.Start(ctx, "bar")
 	defer span.End()
 

example/namedtracer/foo/foo.go

@@ -17,7 +17,7 @@ package foo // import "go.opentelemetry.io/otel/example/namedtracer/foo"
 import (
 	"context"
 
-	"go.opentelemetry.io/otel/global"
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/label"
 	"go.opentelemetry.io/otel/trace"
 )
@@ -31,7 +31,7 @@ var (
 func SubOperation(ctx context.Context) error {
 	// Using global provider. Alternative is to have application provide a getter
 	// for its component to get the instance of the provider.
-	tr := global.Tracer("example/namedtracer/foo")
+	tr := otel.Tracer("example/namedtracer/foo")
 
 	var span trace.Span
 	_, span = tr.Start(ctx, "Sub operation...")

example/namedtracer/go.sum

@@ -4,8 +4,8 @@ github.com/benbjohnson/clock v1.0.3 h1:vkLuvpK4fmtSCuo60+yC63p7y0BmQ8gm5ZXGuBCJy
 github.com/benbjohnson/clock v1.0.3/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
-github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.1.0 h1:Hsa8mG0dQ46ij8Sl2AYJDUv1oA9/d6Vk+3LG99Oe02g=
 github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

example/namedtracer/main.go

@@ -18,10 +18,10 @@ import (
 	"context"
 	"log"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/baggage"
 	"go.opentelemetry.io/otel/example/namedtracer/foo"
 	"go.opentelemetry.io/otel/exporters/stdout"
-	"go.opentelemetry.io/otel/global"
 	"go.opentelemetry.io/otel/label"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 	"go.opentelemetry.io/otel/trace"
@@ -52,7 +52,7 @@ func initTracer() {
 		),
 		sdktrace.WithSpanProcessor(bsp),
 	)
-	global.SetTracerProvider(tp)
+	otel.SetTracerProvider(tp)
 }
 
 func main() {

example/otel-collector/go.sum

@@ -32,8 +32,8 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
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