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Add span.TracerProvider() (open-telemetry#2009)
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* Ensure that no-op tracer still progates non-recording spans

Signed-off-by: Anthony J Mirabella <[email protected]>

* Add `TracerProvider` to the `trace.Span` interface

Signed-off-by: Anthony J Mirabella <[email protected]>

* Remove config from oteltest.Tracer as it can be accessed through the provider

Signed-off-by: Anthony J Mirabella <[email protected]>
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Aneurysm9 authored Jun 17, 2021
1 parent d020e1a commit 39fe809
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Showing 13 changed files with 98 additions and 17 deletions.
2 changes: 2 additions & 0 deletions CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
- Creates package `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` implementing a gRPC `otlpmetric.Client` and offers convenience functions, `New` and `NewUnstarted`, to create an `otlpmetric.Exporter`.(#1991)
- Added `go.opentelemetry.io/otel/exporters/stdout/stdouttrace` exporter. (#2005)
- Added `go.opentelemetry.io/otel/exporters/stdout/stdoutmetric` exporter. (#2005)
- Added a `TracerProvider()` method to the `"go.opentelemetry.io/otel/trace".Span` interface. This can be used to obtain a `TracerProvider` from a given span that utilizes the same trace processing pipeline. (#2009)

### Changed

Expand Down Expand Up @@ -108,6 +109,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
- Remove the `Tracer` method from the `Span` interface in the `go.opentelemetry.io/otel/trace` package.
Using the same tracer that created a span introduces the error where an instrumentation library's `Tracer` is used by other code instead of their own.
The `"go.opentelemetry.io/otel".Tracer` function or a `TracerProvider` should be used to acquire a library specific `Tracer` instead. (#1900)
- The `TracerProvider()` method on the `Span` interface may also be used to obtain a `TracerProvider` using the same trace processing pipeline. (#2009)
- The `http.url` attribute generated by `HTTPClientAttributesFromHTTPRequest` will no longer include username or password information. (#1919)
- The `IsEmpty` method of the `TraceState` type in the `go.opentelemetry.io/otel/trace` package is removed in favor of using the added `TraceState.Len` method. (#1931)
- The `Set`, `Value`, `ContextWithValue`, `ContextWithoutValue`, and `ContextWithEmpty` functions in the `go.opentelemetry.io/otel/baggage` package are removed.
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2 changes: 2 additions & 0 deletions bridge/opentracing/internal/mock.go
Original file line number Diff line number Diff line change
Expand Up @@ -290,3 +290,5 @@ func (s *MockSpan) AddEvent(name string, o ...trace.EventOption) {
func (s *MockSpan) OverrideTracer(tracer trace.Tracer) {
s.officialTracer = tracer
}

func (s *MockSpan) TracerProvider() trace.TracerProvider { return trace.NewNoopTracerProvider() }
14 changes: 9 additions & 5 deletions internal/global/trace.go
Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ func (p *tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
return val
}

t := &tracer{name: name, opts: opts}
t := &tracer{name: name, opts: opts, provider: p}
p.tracers[key] = t
return t
}
Expand All @@ -118,8 +118,9 @@ type il struct {
// All Tracer functionality is forwarded to a delegate once configured.
// Otherwise, all functionality is forwarded to a NoopTracer.
type tracer struct {
name string
opts []trace.TracerOption
name string
opts []trace.TracerOption
provider *tracerProvider

delegate atomic.Value
}
Expand All @@ -145,7 +146,7 @@ func (t *tracer) Start(ctx context.Context, name string, opts ...trace.SpanStart
return delegate.(trace.Tracer).Start(ctx, name, opts...)
}

s := nonRecordingSpan{sc: trace.SpanContextFromContext(ctx)}
s := nonRecordingSpan{sc: trace.SpanContextFromContext(ctx), tracer: t}
ctx = trace.ContextWithSpan(ctx, s)
return ctx, s
}
Expand All @@ -154,7 +155,8 @@ func (t *tracer) Start(ctx context.Context, name string, opts ...trace.SpanStart
// SpanContext. It performs no operations other than to return the wrapped
// SpanContext.
type nonRecordingSpan struct {
sc trace.SpanContext
sc trace.SpanContext
tracer *tracer
}

var _ trace.Span = nonRecordingSpan{}
Expand Down Expand Up @@ -185,3 +187,5 @@ func (nonRecordingSpan) AddEvent(string, ...trace.EventOption) {}

// SetName does nothing.
func (nonRecordingSpan) SetName(string) {}

func (s nonRecordingSpan) TracerProvider() trace.TracerProvider { return s.tracer.provider }
6 changes: 5 additions & 1 deletion internal/global/trace_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -53,14 +53,18 @@ func TestTraceWithSDK(t *testing.T) {
_, span3 := tracer2.Start(ctx, "span3")
span3.End()

// The noop-span should still provide access to a usable TracerProvider.
_, span4 := span1.TracerProvider().Tracer("fromSpan").Start(ctx, "span4")
span4.End()

filterNames := func(spans []*oteltest.Span) []string {
names := make([]string, len(spans))
for i := range spans {
names[i] = spans[i].Name()
}
return names
}
expected := []string{"span2", "span3"}
expected := []string{"span2", "span3", "span4"}
assert.ElementsMatch(t, expected, filterNames(sr.Started()))
assert.ElementsMatch(t, expected, filterNames(sr.Completed()))
}
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6 changes: 6 additions & 0 deletions oteltest/harness.go
Original file line number Diff line number Diff line change
Expand Up @@ -287,6 +287,12 @@ func (h *Harness) testSpan(tracerFactory func() trace.Tracer) {

return subject
},
"Span created via span.TracerProvider()": func() trace.Span {
ctx, spanA := tracerFactory().Start(context.Background(), "span1")

_, spanB := spanA.TracerProvider().Tracer("second").Start(ctx, "span2")
return spanB
},
}

for mechanismName, mechanism := range mechanisms {
Expand Down
6 changes: 3 additions & 3 deletions oteltest/provider.go
Original file line number Diff line number Diff line change
Expand Up @@ -58,9 +58,9 @@ func (p *TracerProvider) Tracer(instName string, opts ...trace.TracerOption) tra
t, ok := p.tracers[inst]
if !ok {
t = &Tracer{
Name: instName,
Version: conf.InstrumentationVersion(),
config: &p.config,
Name: instName,
Version: conf.InstrumentationVersion(),
provider: p,
}
p.tracers[inst] = t
}
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10 changes: 8 additions & 2 deletions oteltest/span.go
Original file line number Diff line number Diff line change
Expand Up @@ -64,8 +64,8 @@ func (s *Span) End(opts ...trace.SpanEndOption) {
}

s.ended = true
if s.tracer.config.SpanRecorder != nil {
s.tracer.config.SpanRecorder.OnEnd(s)
if s.tracer.provider.config.SpanRecorder != nil {
s.tracer.provider.config.SpanRecorder.OnEnd(s)
}
}

Expand Down Expand Up @@ -221,3 +221,9 @@ func (s *Span) StatusMessage() string { return s.statusMessage }

// SpanKind returns the span kind of s.
func (s *Span) SpanKind() trace.SpanKind { return s.spanKind }

// TracerProvider returns a trace.TracerProvider that can be used to generate
// additional Spans on the same telemetry pipeline as the current Span.
func (s *Span) TracerProvider() trace.TracerProvider {
return s.tracer.provider
}
20 changes: 20 additions & 0 deletions oteltest/span_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -569,4 +569,24 @@ func TestSpan(t *testing.T) {
e.Expect(subject.SpanKind()).ToEqual(trace.SpanKindConsumer)
})
})

t.Run("can provide a valid TracerProvider", func(t *testing.T) {
t.Parallel()

e := matchers.NewExpecter(t)

sr := new(oteltest.SpanRecorder)
tracerA := oteltest.NewTracerProvider(oteltest.WithSpanRecorder(sr)).Tracer(t.Name())
ctx, spanA := tracerA.Start(context.Background(), "span1")

e.Expect(len(sr.Started())).ToEqual(1)

_, spanB := spanA.TracerProvider().Tracer("extracted").Start(ctx, "span2")

spans := sr.Started()

e.Expect(len(spans)).ToEqual(2)
e.Expect(spans[0]).ToEqual(spanA)
e.Expect(spans[1]).ToEqual(spanB)
})
}
8 changes: 4 additions & 4 deletions oteltest/tracer.go
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ type Tracer struct {
// Version is the instrumentation version.
Version string

config *config
provider *TracerProvider
}

// Start creates a span. If t is configured with a SpanRecorder its OnStart
Expand All @@ -54,7 +54,7 @@ func (t *Tracer) Start(ctx context.Context, name string, opts ...trace.SpanStart
if c.NewRoot() {
span.spanContext = trace.SpanContext{}
} else {
span.spanContext = t.config.SpanContextFunc(ctx)
span.spanContext = t.provider.config.SpanContextFunc(ctx)
if current := trace.SpanContextFromContext(ctx); current.IsValid() {
span.spanContext = span.spanContext.WithTraceID(current.TraceID())
span.parentSpanID = current.SpanID()
Expand All @@ -77,8 +77,8 @@ func (t *Tracer) Start(ctx context.Context, name string, opts ...trace.SpanStart
span.SetName(name)
span.SetAttributes(c.Attributes()...)

if t.config.SpanRecorder != nil {
t.config.SpanRecorder.OnStart(span)
if t.provider.config.SpanRecorder != nil {
t.provider.config.SpanRecorder.OnStart(span)
}
return trace.ContextWithSpan(ctx, span), span
}
6 changes: 6 additions & 0 deletions sdk/trace/span.go
Original file line number Diff line number Diff line change
Expand Up @@ -470,6 +470,12 @@ func (s *span) ChildSpanCount() int {
return s.childSpanCount
}

// TracerProvider returns a trace.TracerProvider that can be used to generate
// additional Spans on the same telemetry pipeline as the current Span.
func (s *span) TracerProvider() trace.TracerProvider {
return s.tracer.provider
}

// snapshot creates a read-only copy of the current state of the span.
func (s *span) snapshot() ReadOnlySpan {
var sd snapshot
Expand Down
12 changes: 10 additions & 2 deletions trace/noop.go
Original file line number Diff line number Diff line change
Expand Up @@ -42,9 +42,14 @@ type noopTracer struct{}

var _ Tracer = noopTracer{}

// Start starts a noop span.
// Start carries forward a non-recording Span, if one is present in the context, otherwise it
// creates a no-op Span.
func (t noopTracer) Start(ctx context.Context, name string, _ ...SpanStartOption) (context.Context, Span) {
span := noopSpan{}
span := SpanFromContext(ctx)
if _, ok := span.(nonRecordingSpan); !ok {
// span is likely already a noopSpan, but let's be sure
span = noopSpan{}
}
return ContextWithSpan(ctx, span), span
}

Expand Down Expand Up @@ -79,3 +84,6 @@ func (noopSpan) AddEvent(string, ...EventOption) {}

// SetName does nothing.
func (noopSpan) SetName(string) {}

// TracerProvider returns a no-op TracerProvider
func (noopSpan) TracerProvider() TracerProvider { return noopTracerProvider{} }
19 changes: 19 additions & 0 deletions trace/noop_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -70,3 +70,22 @@ func TestNoopSpan(t *testing.T) {
t.Errorf("span.IsRecording() returned %#v, want %#v", got, want)
}
}

func TestNonRecordingSpanTracerStart(t *testing.T) {
tid, err := TraceIDFromHex("01000000000000000000000000000000")
if err != nil {
t.Fatalf("failure creating TraceID: %s", err.Error())
}
sid, err := SpanIDFromHex("0200000000000000")
if err != nil {
t.Fatalf("failure creating SpanID: %s", err.Error())
}
sc := NewSpanContext(SpanContextConfig{TraceID: tid, SpanID: sid})

ctx := ContextWithSpanContext(context.Background(), sc)
_, span := NewNoopTracerProvider().Tracer("test instrumentation").Start(ctx, "span1")

if got, want := span.SpanContext(), sc; !assertSpanContextEqual(got, want) {
t.Errorf("SpanContext not carried by nonRecordingSpan. got %#v, want %#v", got, want)
}
}
4 changes: 4 additions & 0 deletions trace/trace.go
Original file line number Diff line number Diff line change
Expand Up @@ -373,6 +373,10 @@ type Span interface {
// already exists for an attribute of the Span it will be overwritten with
// the value contained in kv.
SetAttributes(kv ...attribute.KeyValue)

// TracerProvider returns a TracerProvider that can be used to generate
// additional Spans on the same telemetry pipeline as the current Span.
TracerProvider() TracerProvider
}

// Link is the relationship between two Spans. The relationship can be within
Expand Down

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