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trace_test.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace
import (
"context"
"errors"
"fmt"
"math"
"strconv"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/sdk/instrumentation"
ottest "go.opentelemetry.io/otel/sdk/internal/internaltest"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
"go.opentelemetry.io/otel/trace"
)
const envVar = "OTEL_RESOURCE_ATTRIBUTES"
type storingHandler struct {
errs []error
}
func (s *storingHandler) Handle(err error) {
s.errs = append(s.errs, err)
}
func (s *storingHandler) Reset() {
s.errs = nil
}
var (
tid trace.TraceID
sid trace.SpanID
sc trace.SpanContext
ts trace.TraceState
handler = &storingHandler{}
)
func init() {
tid, _ = trace.TraceIDFromHex("01020304050607080102040810203040")
sid, _ = trace.SpanIDFromHex("0102040810203040")
sc = trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
SpanID: sid,
TraceFlags: 0x1,
})
ts, _ = trace.ParseTraceState("k=v")
otel.SetErrorHandler(handler)
}
func TestTracerFollowsExpectedAPIBehaviour(t *testing.T) {
harness := ottest.NewHarness(t)
harness.TestTracerProvider(func() trace.TracerProvider {
return NewTracerProvider(WithSampler(TraceIDRatioBased(0)))
})
tp := NewTracerProvider(WithSampler(TraceIDRatioBased(0)))
harness.TestTracer(func() trace.Tracer {
return tp.Tracer("")
})
}
type testExporter struct {
mu sync.RWMutex
idx map[string]int
spans []*snapshot
}
func NewTestExporter() *testExporter {
return &testExporter{idx: make(map[string]int)}
}
func (te *testExporter) ExportSpans(_ context.Context, spans []ReadOnlySpan) error {
te.mu.Lock()
defer te.mu.Unlock()
i := len(te.spans)
for _, s := range spans {
te.idx[s.Name()] = i
te.spans = append(te.spans, s.(*snapshot))
i++
}
return nil
}
func (te *testExporter) Spans() []*snapshot {
te.mu.RLock()
defer te.mu.RUnlock()
cp := make([]*snapshot, len(te.spans))
copy(cp, te.spans)
return cp
}
func (te *testExporter) GetSpan(name string) (*snapshot, bool) {
te.mu.RLock()
defer te.mu.RUnlock()
i, ok := te.idx[name]
if !ok {
return nil, false
}
return te.spans[i], true
}
func (te *testExporter) Len() int {
te.mu.RLock()
defer te.mu.RUnlock()
return len(te.spans)
}
func (te *testExporter) Shutdown(context.Context) error {
te.Reset()
return nil
}
func (te *testExporter) Reset() {
te.mu.Lock()
defer te.mu.Unlock()
te.idx = make(map[string]int)
te.spans = te.spans[:0]
}
type testSampler struct {
callCount int
prefix string
t *testing.T
}
func (ts *testSampler) ShouldSample(p SamplingParameters) SamplingResult {
ts.callCount++
ts.t.Logf("called sampler for name %q", p.Name)
decision := Drop
if strings.HasPrefix(p.Name, ts.prefix) {
decision = RecordAndSample
}
return SamplingResult{Decision: decision, Attributes: []attribute.KeyValue{attribute.Int("callCount", ts.callCount)}}
}
func (ts testSampler) Description() string {
return "testSampler"
}
func TestSetName(t *testing.T) {
tp := NewTracerProvider()
type testCase struct {
name string
newName string
}
for idx, tt := range []testCase{
{ // 0
name: "foobar",
newName: "foobaz",
},
{ // 1
name: "foobar",
newName: "barbaz",
},
{ // 2
name: "barbar",
newName: "barbaz",
},
{ // 3
name: "barbar",
newName: "foobar",
},
} {
sp := startNamedSpan(tp, "SetName", tt.name)
if sdkspan, ok := sp.(*recordingSpan); ok {
if sdkspan.Name() != tt.name {
t.Errorf("%d: invalid name at span creation, expected %v, got %v", idx, tt.name, sdkspan.Name())
}
} else {
t.Errorf("%d: unable to coerce span to SDK span, is type %T", idx, sp)
}
sp.SetName(tt.newName)
if sdkspan, ok := sp.(*recordingSpan); ok {
if sdkspan.Name() != tt.newName {
t.Errorf("%d: span name not changed, expected %v, got %v", idx, tt.newName, sdkspan.Name())
}
} else {
t.Errorf("%d: unable to coerce span to SDK span, is type %T", idx, sp)
}
sp.End()
}
}
func TestSpanIsRecording(t *testing.T) {
t.Run("while Span active", func(t *testing.T) {
for name, tc := range map[string]struct {
sampler Sampler
want bool
}{
"Always sample, recording on": {sampler: AlwaysSample(), want: true},
"Never sample recording off": {sampler: NeverSample(), want: false},
} {
tp := NewTracerProvider(WithSampler(tc.sampler))
_, span := tp.Tracer(name).Start(context.Background(), "StartSpan")
got := span.IsRecording()
span.End()
assert.Equal(t, tc.want, got, name)
}
})
t.Run("after Span end", func(t *testing.T) {
for name, tc := range map[string]Sampler{
"Always Sample": AlwaysSample(),
"Never Sample": NeverSample(),
} {
tp := NewTracerProvider(WithSampler(tc))
_, span := tp.Tracer(name).Start(context.Background(), "StartSpan")
span.End()
got := span.IsRecording()
assert.False(t, got, name)
}
})
}
func TestSampling(t *testing.T) {
idg := defaultIDGenerator()
const total = 10000
for name, tc := range map[string]struct {
sampler Sampler
expect float64
parent bool
sampledParent bool
}{
// Span w/o a parent
"NeverSample": {sampler: NeverSample(), expect: 0},
"AlwaysSample": {sampler: AlwaysSample(), expect: 1.0},
"TraceIdRatioBased_-1": {sampler: TraceIDRatioBased(-1.0), expect: 0},
"TraceIdRatioBased_.25": {sampler: TraceIDRatioBased(0.25), expect: .25},
"TraceIdRatioBased_.50": {sampler: TraceIDRatioBased(0.50), expect: .5},
"TraceIdRatioBased_.75": {sampler: TraceIDRatioBased(0.75), expect: .75},
"TraceIdRatioBased_2.0": {sampler: TraceIDRatioBased(2.0), expect: 1},
// Spans w/o a parent and using ParentBased(DelegateSampler()) Sampler, receive DelegateSampler's sampling decision
"ParentNeverSample": {sampler: ParentBased(NeverSample()), expect: 0},
"ParentAlwaysSample": {sampler: ParentBased(AlwaysSample()), expect: 1},
"ParentTraceIdRatioBased_.50": {sampler: ParentBased(TraceIDRatioBased(0.50)), expect: .5},
// An unadorned TraceIDRatioBased sampler ignores parent spans
"UnsampledParentSpanWithTraceIdRatioBased_.25": {sampler: TraceIDRatioBased(0.25), expect: .25, parent: true},
"SampledParentSpanWithTraceIdRatioBased_.25": {sampler: TraceIDRatioBased(0.25), expect: .25, parent: true, sampledParent: true},
"UnsampledParentSpanWithTraceIdRatioBased_.50": {sampler: TraceIDRatioBased(0.50), expect: .5, parent: true},
"SampledParentSpanWithTraceIdRatioBased_.50": {sampler: TraceIDRatioBased(0.50), expect: .5, parent: true, sampledParent: true},
"UnsampledParentSpanWithTraceIdRatioBased_.75": {sampler: TraceIDRatioBased(0.75), expect: .75, parent: true},
"SampledParentSpanWithTraceIdRatioBased_.75": {sampler: TraceIDRatioBased(0.75), expect: .75, parent: true, sampledParent: true},
// Spans with a sampled parent but using NeverSample Sampler, are not sampled
"SampledParentSpanWithNeverSample": {sampler: NeverSample(), expect: 0, parent: true, sampledParent: true},
// Spans with a sampled parent and using ParentBased(DelegateSampler()) Sampler, inherit the parent span's sampling status
"SampledParentSpanWithParentNeverSample": {sampler: ParentBased(NeverSample()), expect: 1, parent: true, sampledParent: true},
"UnsampledParentSpanWithParentNeverSampler": {sampler: ParentBased(NeverSample()), expect: 0, parent: true, sampledParent: false},
"SampledParentSpanWithParentAlwaysSampler": {sampler: ParentBased(AlwaysSample()), expect: 1, parent: true, sampledParent: true},
"UnsampledParentSpanWithParentAlwaysSampler": {sampler: ParentBased(AlwaysSample()), expect: 0, parent: true, sampledParent: false},
"SampledParentSpanWithParentTraceIdRatioBased_.50": {sampler: ParentBased(TraceIDRatioBased(0.50)), expect: 1, parent: true, sampledParent: true},
"UnsampledParentSpanWithParentTraceIdRatioBased_.50": {sampler: ParentBased(TraceIDRatioBased(0.50)), expect: 0, parent: true, sampledParent: false},
} {
tc := tc
t.Run(name, func(t *testing.T) {
t.Parallel()
p := NewTracerProvider(WithSampler(tc.sampler))
tr := p.Tracer("test")
var sampled int
for i := 0; i < total; i++ {
ctx := context.Background()
if tc.parent {
tid, sid := idg.NewIDs(ctx)
psc := trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
SpanID: sid,
})
if tc.sampledParent {
psc = psc.WithTraceFlags(trace.FlagsSampled)
}
ctx = trace.ContextWithRemoteSpanContext(ctx, psc)
}
_, span := tr.Start(ctx, "test")
if span.SpanContext().IsSampled() {
sampled++
}
}
tolerance := 0.0
got := float64(sampled) / float64(total)
if tc.expect > 0 && tc.expect < 1 {
// See https://en.wikipedia.org/wiki/Binomial_proportion_confidence_interval
const z = 4.75342 // This should succeed 99.9999% of the time
tolerance = z * math.Sqrt(got*(1-got)/total)
}
diff := math.Abs(got - tc.expect)
if diff > tolerance {
t.Errorf("got %f (diff: %f), expected %f (w/tolerance: %f)", got, diff, tc.expect, tolerance)
}
})
}
}
func TestStartSpanWithParent(t *testing.T) {
tp := NewTracerProvider()
tr := tp.Tracer("SpanWithParent")
ctx := context.Background()
_, s1 := tr.Start(trace.ContextWithRemoteSpanContext(ctx, sc), "span1-unsampled-parent1")
if err := checkChild(t, sc, s1); err != nil {
t.Error(err)
}
_, s2 := tr.Start(trace.ContextWithRemoteSpanContext(ctx, sc), "span2-unsampled-parent1")
if err := checkChild(t, sc, s2); err != nil {
t.Error(err)
}
sc2 := sc.WithTraceState(ts)
_, s3 := tr.Start(trace.ContextWithRemoteSpanContext(ctx, sc2), "span3-sampled-parent2")
if err := checkChild(t, sc2, s3); err != nil {
t.Error(err)
}
ctx2, s4 := tr.Start(trace.ContextWithRemoteSpanContext(ctx, sc2), "span4-sampled-parent2")
if err := checkChild(t, sc2, s4); err != nil {
t.Error(err)
}
s4Sc := s4.SpanContext()
_, s5 := tr.Start(ctx2, "span5-implicit-childof-span4")
if err := checkChild(t, s4Sc, s5); err != nil {
t.Error(err)
}
}
// Test we get a successful span as a new root if a nil context is sent in, as opposed to a panic.
// See https://github.com/open-telemetry/opentelemetry-go/issues/3109
func TestStartSpanWithNilContext(t *testing.T) {
tp := NewTracerProvider()
tr := tp.Tracer("NoPanic")
// nolint:staticcheck // no nil context, but that's the point of the test.
assert.NotPanics(t, func() { tr.Start(nil, "should-not-panic") })
}
func TestStartSpanNewRootNotSampled(t *testing.T) {
alwaysSampleTp := NewTracerProvider()
sampledTr := alwaysSampleTp.Tracer("AlwaysSampled")
neverSampleTp := NewTracerProvider(WithSampler(ParentBased(NeverSample())))
neverSampledTr := neverSampleTp.Tracer("ParentBasedNeverSample")
ctx := context.Background()
ctx, s1 := sampledTr.Start(trace.ContextWithRemoteSpanContext(ctx, sc), "span1-sampled")
if err := checkChild(t, sc, s1); err != nil {
t.Error(err)
}
_, s2 := neverSampledTr.Start(ctx, "span2-no-newroot")
if !s2.SpanContext().IsSampled() {
t.Error(fmt.Errorf("got child span is not sampled, want child span with sampler: ParentBased(NeverSample()) to be sampled"))
}
// Adding WithNewRoot causes child spans to not sample based on parent context
_, s3 := neverSampledTr.Start(ctx, "span3-newroot", trace.WithNewRoot())
if s3.SpanContext().IsSampled() {
t.Error(fmt.Errorf("got child span is sampled, want child span WithNewRoot() and with sampler: ParentBased(NeverSample()) to not be sampled"))
}
}
func TestSetSpanAttributesOnStart(t *testing.T) {
te := NewTestExporter()
tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
span := startSpan(tp,
"StartSpanAttribute",
trace.WithAttributes(attribute.String("key1", "value1")),
trace.WithAttributes(attribute.String("key2", "value2")),
)
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
attributes: []attribute.KeyValue{
attribute.String("key1", "value1"),
attribute.String("key2", "value2"),
},
spanKind: trace.SpanKindInternal,
instrumentationScope: instrumentation.Scope{Name: "StartSpanAttribute"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("SetSpanAttributesOnStart: -got +want %s", diff)
}
}
func TestSamplerAttributesLocalChildSpan(t *testing.T) {
sampler := &testSampler{prefix: "span", t: t}
te := NewTestExporter()
tp := NewTracerProvider(WithSampler(sampler), WithSyncer(te), WithResource(resource.Empty()))
ctx := context.Background()
ctx, span := startLocalSpan(ctx, tp, "SpanOne", "span0")
_, spanTwo := startLocalSpan(ctx, tp, "SpanTwo", "span1")
spanTwo.End()
span.End()
got := te.Spans()
require.Len(t, got, 2)
// FILO order above means spanTwo <-> gotSpan0 and span <-> gotSpan1.
gotSpan0, gotSpan1 := got[0], got[1]
// Ensure sampler is called for local child spans by verifying the
// attributes set by the sampler are set on the child span.
assert.Equal(t, []attribute.KeyValue{attribute.Int("callCount", 2)}, gotSpan0.Attributes())
assert.Equal(t, []attribute.KeyValue{attribute.Int("callCount", 1)}, gotSpan1.Attributes())
}
func TestSpanSetAttributes(t *testing.T) {
attrs := [...]attribute.KeyValue{
attribute.String("key1", "value1"),
attribute.String("key2", "value2"),
attribute.String("key3", "value3"),
attribute.String("key4", "value4"),
attribute.String("key1", "value5"),
attribute.String("key2", "value6"),
attribute.String("key3", "value7"),
}
invalid := attribute.KeyValue{}
tests := []struct {
name string
input [][]attribute.KeyValue
wantAttrs []attribute.KeyValue
wantDropped int
}{
{
name: "array",
input: [][]attribute.KeyValue{attrs[:3]},
wantAttrs: attrs[:3],
},
{
name: "single_value:array",
input: [][]attribute.KeyValue{attrs[:1], attrs[1:3]},
wantAttrs: attrs[:3],
},
{
name: "array:single_value",
input: [][]attribute.KeyValue{attrs[:2], attrs[2:3]},
wantAttrs: attrs[:3],
},
{
name: "single_values",
input: [][]attribute.KeyValue{attrs[:1], attrs[1:2], attrs[2:3]},
wantAttrs: attrs[:3],
},
// The tracing specification states:
//
// For each unique attribute key, addition of which would result in
// exceeding the limit, SDK MUST discard that key/value pair
//
// Therefore, adding attributes after the capacity is reached should
// result in those attributes being dropped.
{
name: "drop_last_added",
input: [][]attribute.KeyValue{attrs[:3], attrs[3:4], attrs[3:4]},
wantAttrs: attrs[:3],
wantDropped: 2,
},
// The tracing specification states:
//
// Setting an attribute with the same key as an existing attribute
// SHOULD overwrite the existing attribute's value.
//
// Therefore, attributes are updated regardless of capacity state.
{
name: "single_value_update",
input: [][]attribute.KeyValue{attrs[:1], attrs[:3]},
wantAttrs: attrs[:3],
},
{
name: "all_update",
input: [][]attribute.KeyValue{attrs[:3], attrs[4:7]},
wantAttrs: attrs[4:7],
},
{
name: "all_update/multi",
input: [][]attribute.KeyValue{attrs[:3], attrs[4:7], attrs[:3]},
wantAttrs: attrs[:3],
},
{
name: "deduplicate/under_capacity",
input: [][]attribute.KeyValue{attrs[:1], attrs[:1], attrs[:1]},
wantAttrs: attrs[:1],
},
{
name: "deduplicate/over_capacity",
input: [][]attribute.KeyValue{attrs[:1], attrs[:1], attrs[:1], attrs[:3]},
wantAttrs: attrs[:3],
},
{
name: "deduplicate/added",
input: [][]attribute.KeyValue{
attrs[:2],
{attrs[2], attrs[2], attrs[2]},
},
wantAttrs: attrs[:3],
},
{
name: "deduplicate/added_at_cappacity",
input: [][]attribute.KeyValue{
attrs[:3],
{attrs[2], attrs[2], attrs[2]},
},
wantAttrs: attrs[:3],
},
{
name: "invalid",
input: [][]attribute.KeyValue{
{invalid},
},
wantDropped: 1,
},
{
name: "invalid_with_valid",
input: [][]attribute.KeyValue{
{invalid, attrs[0]},
},
wantAttrs: attrs[:1],
wantDropped: 1,
},
{
name: "invalid_over_capacity",
input: [][]attribute.KeyValue{
{invalid, invalid, invalid, invalid, attrs[0]},
},
wantAttrs: attrs[:1],
wantDropped: 4,
},
{
name: "valid:invalid/under_capacity",
input: [][]attribute.KeyValue{
attrs[:1],
{invalid},
},
wantAttrs: attrs[:1],
wantDropped: 1,
},
{
name: "valid:invalid/over_capacity",
input: [][]attribute.KeyValue{
attrs[:1],
{invalid, invalid, invalid, invalid},
},
wantAttrs: attrs[:1],
wantDropped: 4,
},
{
name: "valid_at_capacity:invalid",
input: [][]attribute.KeyValue{
attrs[:3],
{invalid, invalid, invalid, invalid},
},
wantAttrs: attrs[:3],
wantDropped: 4,
},
}
const (
capacity = 3
instName = "TestSpanAttributeCapacity"
spanName = "test span"
)
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
te := NewTestExporter()
sl := NewSpanLimits()
sl.AttributeCountLimit = capacity
tp := NewTracerProvider(WithSyncer(te), WithSpanLimits(sl))
_, span := tp.Tracer(instName).Start(context.Background(), spanName)
for _, a := range test.input {
span.SetAttributes(a...)
}
span.End()
require.Implements(t, (*ReadOnlySpan)(nil), span)
roSpan := span.(ReadOnlySpan)
// Ensure the span itself is valid.
assert.ElementsMatch(t, test.wantAttrs, roSpan.Attributes(), "expected attributes")
assert.Equal(t, test.wantDropped, roSpan.DroppedAttributes(), "dropped attributes")
snap, ok := te.GetSpan(spanName)
require.Truef(t, ok, "span %s not exported", spanName)
// Ensure the exported span snapshot is valid.
assert.ElementsMatch(t, test.wantAttrs, snap.Attributes(), "expected attributes")
assert.Equal(t, test.wantDropped, snap.DroppedAttributes(), "dropped attributes")
})
}
}
func TestEvents(t *testing.T) {
te := NewTestExporter()
tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
span := startSpan(tp, "Events")
k1v1 := attribute.String("key1", "value1")
k2v2 := attribute.Bool("key2", true)
k3v3 := attribute.Int64("key3", 3)
span.AddEvent("foo", trace.WithAttributes(attribute.String("key1", "value1")))
span.AddEvent("bar", trace.WithAttributes(
attribute.Bool("key2", true),
attribute.Int64("key3", 3),
))
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
for i := range got.Events() {
if !checkTime(&got.Events()[i].Time) {
t.Error("exporting span: expected nonzero Event Time")
}
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
events: []Event{
{Name: "foo", Attributes: []attribute.KeyValue{k1v1}},
{Name: "bar", Attributes: []attribute.KeyValue{k2v2, k3v3}},
},
spanKind: trace.SpanKindInternal,
instrumentationScope: instrumentation.Scope{Name: "Events"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("Message Events: -got +want %s", diff)
}
}
func TestEventsOverLimit(t *testing.T) {
te := NewTestExporter()
sl := NewSpanLimits()
sl.EventCountLimit = 2
tp := NewTracerProvider(WithSpanLimits(sl), WithSyncer(te), WithResource(resource.Empty()))
span := startSpan(tp, "EventsOverLimit")
k1v1 := attribute.String("key1", "value1")
k2v2 := attribute.Bool("key2", false)
k3v3 := attribute.String("key3", "value3")
span.AddEvent("fooDrop", trace.WithAttributes(attribute.String("key1", "value1")))
span.AddEvent("barDrop", trace.WithAttributes(
attribute.Bool("key2", true),
attribute.String("key3", "value3"),
))
span.AddEvent("foo", trace.WithAttributes(attribute.String("key1", "value1")))
span.AddEvent("bar", trace.WithAttributes(
attribute.Bool("key2", false),
attribute.String("key3", "value3"),
))
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
for i := range got.Events() {
if !checkTime(&got.Events()[i].Time) {
t.Error("exporting span: expected nonzero Event Time")
}
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
events: []Event{
{Name: "foo", Attributes: []attribute.KeyValue{k1v1}},
{Name: "bar", Attributes: []attribute.KeyValue{k2v2, k3v3}},
},
droppedEventCount: 2,
spanKind: trace.SpanKindInternal,
instrumentationScope: instrumentation.Scope{Name: "EventsOverLimit"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("Message Event over limit: -got +want %s", diff)
}
}
func TestLinks(t *testing.T) {
te := NewTestExporter()
tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
k1v1 := attribute.String("key1", "value1")
k2v2 := attribute.String("key2", "value2")
k3v3 := attribute.String("key3", "value3")
sc1 := trace.NewSpanContext(trace.SpanContextConfig{TraceID: trace.TraceID([16]byte{1, 1}), SpanID: trace.SpanID{3}})
sc2 := trace.NewSpanContext(trace.SpanContextConfig{TraceID: trace.TraceID([16]byte{1, 1}), SpanID: trace.SpanID{3}})
l1 := trace.Link{SpanContext: sc1, Attributes: []attribute.KeyValue{k1v1}}
l2 := trace.Link{SpanContext: sc2, Attributes: []attribute.KeyValue{k2v2, k3v3}}
links := []trace.Link{l1, l2}
span := startSpan(tp, "Links", trace.WithLinks(links...))
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
links: []Link{{l1.SpanContext, l1.Attributes, 0}, {l2.SpanContext, l2.Attributes, 0}},
spanKind: trace.SpanKindInternal,
instrumentationScope: instrumentation.Scope{Name: "Links"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("Link: -got +want %s", diff)
}
sc1 = trace.NewSpanContext(trace.SpanContextConfig{TraceID: trace.TraceID([16]byte{1, 1}), SpanID: trace.SpanID{3}})
span1 := startSpan(tp, "name", trace.WithLinks([]trace.Link{
{SpanContext: trace.SpanContext{}},
{SpanContext: sc1},
}...))
sdkspan, _ := span1.(*recordingSpan)
require.Len(t, sdkspan.Links(), 1)
}
func TestLinksOverLimit(t *testing.T) {
te := NewTestExporter()
sc1 := trace.NewSpanContext(trace.SpanContextConfig{TraceID: trace.TraceID([16]byte{1, 1}), SpanID: trace.SpanID{3}})
sc2 := trace.NewSpanContext(trace.SpanContextConfig{TraceID: trace.TraceID([16]byte{1, 1}), SpanID: trace.SpanID{3}})
sc3 := trace.NewSpanContext(trace.SpanContextConfig{TraceID: trace.TraceID([16]byte{1, 1}), SpanID: trace.SpanID{3}})
sl := NewSpanLimits()
sl.LinkCountLimit = 2
tp := NewTracerProvider(WithSpanLimits(sl), WithSyncer(te), WithResource(resource.Empty()))
span := startSpan(tp, "LinksOverLimit",
trace.WithLinks(
trace.Link{SpanContext: sc1, Attributes: []attribute.KeyValue{attribute.String("key1", "value1")}},
trace.Link{SpanContext: sc2, Attributes: []attribute.KeyValue{attribute.String("key2", "value2")}},
trace.Link{SpanContext: sc3, Attributes: []attribute.KeyValue{attribute.String("key3", "value3")}},
),
)
k2v2 := attribute.String("key2", "value2")
k3v3 := attribute.String("key3", "value3")
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
links: []Link{
{SpanContext: sc2, Attributes: []attribute.KeyValue{k2v2}, DroppedAttributeCount: 0},
{SpanContext: sc3, Attributes: []attribute.KeyValue{k3v3}, DroppedAttributeCount: 0},
},
droppedLinkCount: 1,
spanKind: trace.SpanKindInternal,
instrumentationScope: instrumentation.Scope{Name: "LinksOverLimit"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("Link over limit: -got +want %s", diff)
}
}
func TestSetSpanName(t *testing.T) {
te := NewTestExporter()
tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
ctx := context.Background()
want := "SpanName-1"
ctx = trace.ContextWithRemoteSpanContext(ctx, sc)
_, span := tp.Tracer("SetSpanName").Start(ctx, "SpanName-1")
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
if got.Name() != want {
t.Errorf("span.Name: got %q; want %q", got.Name(), want)
}
}
func TestSetSpanStatus(t *testing.T) {
te := NewTestExporter()
tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
span := startSpan(tp, "SpanStatus")
span.SetStatus(codes.Error, "Error")
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
spanKind: trace.SpanKindInternal,
status: Status{
Code: codes.Error,
Description: "Error",
},
instrumentationScope: instrumentation.Scope{Name: "SpanStatus"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("SetSpanStatus: -got +want %s", diff)
}
}
func TestSetSpanStatusWithoutMessageWhenStatusIsNotError(t *testing.T) {
te := NewTestExporter()
tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
span := startSpan(tp, "SpanStatus")
span.SetStatus(codes.Ok, "This message will be ignored")
got, err := endSpan(te, span)
if err != nil {
t.Fatal(err)
}
want := &snapshot{
spanContext: trace.NewSpanContext(trace.SpanContextConfig{
TraceID: tid,
TraceFlags: 0x1,
}),
parent: sc.WithRemote(true),
name: "span0",
spanKind: trace.SpanKindInternal,
status: Status{
Code: codes.Ok,
Description: "",
},
instrumentationScope: instrumentation.Scope{Name: "SpanStatus"},
}
if diff := cmpDiff(got, want); diff != "" {
t.Errorf("SetSpanStatus: -got +want %s", diff)
}
}
func cmpDiff(x, y interface{}) string {
return cmp.Diff(x, y,
cmp.AllowUnexported(snapshot{}),
cmp.AllowUnexported(attribute.Value{}),
cmp.AllowUnexported(Event{}),
cmp.AllowUnexported(trace.TraceState{}),
cmp.Comparer(func(x, y attribute.Set) bool {
return x.Equals(&y)
}),
)
}
// checkChild is test utility function that tests that c has fields set appropriately,
// given that it is a child span of p.
func checkChild(t *testing.T, p trace.SpanContext, apiSpan trace.Span) error {
s := apiSpan.(*recordingSpan)
if s == nil {
return fmt.Errorf("got nil child span, want non-nil")
}
if got, want := s.spanContext.TraceID().String(), p.TraceID().String(); got != want {
return fmt.Errorf("got child trace ID %s, want %s", got, want)
}
if childID, parentID := s.spanContext.SpanID().String(), p.SpanID().String(); childID == parentID {
return fmt.Errorf("got child span ID %s, parent span ID %s; want unequal IDs", childID, parentID)
}
if got, want := s.spanContext.TraceFlags(), p.TraceFlags(); got != want {
return fmt.Errorf("got child trace options %d, want %d", got, want)
}
got, want := s.spanContext.TraceState(), p.TraceState()
assert.Equal(t, want, got)
return nil
}
// startSpan starts a span with a name "span0". See startNamedSpan for
// details.
func startSpan(tp *TracerProvider, trName string, args ...trace.SpanStartOption) trace.Span {
return startNamedSpan(tp, trName, "span0", args...)
}
// startNamed Span is a test utility func that starts a span with a
// passed name and with remote span context as parent. The remote span
// context contains TraceFlags with sampled bit set. This allows the
// span to be automatically sampled.
func startNamedSpan(tp *TracerProvider, trName, name string, args ...trace.SpanStartOption) trace.Span {
_, span := tp.Tracer(trName).Start(
trace.ContextWithRemoteSpanContext(context.Background(), sc),
name,
args...,
)
return span
}
// startLocalSpan is a test utility func that starts a span with a
// passed name and with the passed context. The context is returned
// along with the span so this parent can be used to create child
// spans.
func startLocalSpan(ctx context.Context, tp *TracerProvider, trName, name string, args ...trace.SpanStartOption) (context.Context, trace.Span) {
ctx, span := tp.Tracer(trName).Start(
ctx,
name,
args...,
)
return ctx, span
}
// endSpan is a test utility function that ends the span in the context and
// returns the exported span.
// It requires that span be sampled using one of these methods
// 1. Passing parent span context in context
// 2. Use WithSampler(AlwaysSample())
// 3. Configuring AlwaysSample() as default sampler
//
// It also does some basic tests on the span.
// It also clears spanID in the to make the comparison easier.
func endSpan(te *testExporter, span trace.Span) (*snapshot, error) {
if !span.IsRecording() {
return nil, fmt.Errorf("method IsRecording: got false, want true")
}
if !span.SpanContext().IsSampled() {
return nil, fmt.Errorf("method IsSampled: got false, want true")
}
span.End()
if te.Len() != 1 {
return nil, fmt.Errorf("got %d exported spans, want one span", te.Len())
}
got := te.Spans()[0]
if !got.SpanContext().SpanID().IsValid() {
return nil, fmt.Errorf("exporting span: expected nonzero SpanID")
}
got.spanContext = got.SpanContext().WithSpanID(trace.SpanID{})
if !checkTime(&got.startTime) {
return nil, fmt.Errorf("exporting span: expected nonzero StartTime")
}
if !checkTime(&got.endTime) {
return nil, fmt.Errorf("exporting span: expected nonzero EndTime")
}
return got, nil
}
// checkTime checks that a nonzero time was set in x, then clears it.
func checkTime(x *time.Time) bool {
if x.IsZero() {
return false