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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package opencensus
import (
"context"
"fmt"
"net/http"
"testing"
"github.com/google/go-cmp/cmp"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
var (
traceID = trace.TraceID([16]byte{14, 54, 12})
spanID = trace.SpanID([8]byte{0, 0, 0, 0, 0, 0, 0, 1})
childSpanID = trace.SpanID([8]byte{0, 0, 0, 0, 0, 0, 0, 2})
headerFmt = "\x00\x00\x0e6\f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00%s\x02%s"
)
func TestFields(t *testing.T) {
b := Binary{}
fields := b.Fields()
if len(fields) != 1 {
t.Fatalf("Got %d fields, expected 1", len(fields))
}
if fields[0] != "grpc-trace-bin" {
t.Errorf("Got fields[0] == %s, expected grpc-trace-bin", fields[0])
}
}
func TestInject(t *testing.T) {
prop := Binary{}
for _, tt := range []struct {
desc string
scc trace.SpanContextConfig
wantHeader string
}{
{
desc: "empty",
scc: trace.SpanContextConfig{},
wantHeader: "",
},
{
desc: "valid spancontext, sampled",
scc: trace.SpanContextConfig{
TraceID: traceID,
SpanID: spanID,
TraceFlags: trace.FlagsSampled,
},
wantHeader: fmt.Sprintf(headerFmt, "\x01", "\x01"),
},
{
desc: "valid spancontext, not sampled",
scc: trace.SpanContextConfig{
TraceID: traceID,
SpanID: spanID,
},
wantHeader: fmt.Sprintf(headerFmt, "\x01", "\x00"),
},
{
desc: "valid spancontext, with unsupported bit set in traceflags",
scc: trace.SpanContextConfig{
TraceID: traceID,
SpanID: spanID,
TraceFlags: 0xff,
},
wantHeader: fmt.Sprintf(headerFmt, "\x01", "\x01"),
},
{
desc: "invalid spancontext",
scc: trace.SpanContextConfig{},
wantHeader: "",
},
} {
t.Run(tt.desc, func(t *testing.T) {
header := http.Header{}
ctx := context.Background()
if sc := trace.NewSpanContext(tt.scc); sc.IsValid() {
ctx = trace.ContextWithRemoteSpanContext(ctx, sc)
}
prop.Inject(ctx, propagation.HeaderCarrier(header))
gotHeader := header.Get("grpc-trace-bin")
if gotHeader != tt.wantHeader {
t.Errorf("Got header = %q, want %q", gotHeader, tt.wantHeader)
}
})
}
}
func TestExtract(t *testing.T) {
prop := Binary{}
for _, tt := range []struct {
desc string
header string
wantScc trace.SpanContextConfig
}{
{
desc: "empty",
header: "",
wantScc: trace.SpanContextConfig{},
},
{
desc: "header not binary",
header: "5435j345io34t5904w3jt894j3t854w89tp95jgt9",
wantScc: trace.SpanContextConfig{},
},
{
desc: "valid binary header",
header: fmt.Sprintf(headerFmt, "\x02", "\x00"),
wantScc: trace.SpanContextConfig{
TraceID: traceID,
SpanID: childSpanID,
},
},
{
desc: "valid binary and sampled",
header: fmt.Sprintf(headerFmt, "\x02", "\x01"),
wantScc: trace.SpanContextConfig{
TraceID: traceID,
SpanID: childSpanID,
TraceFlags: trace.FlagsSampled,
},
},
} {
t.Run(tt.desc, func(t *testing.T) {
header := http.Header{
http.CanonicalHeaderKey("grpc-trace-bin"): []string{tt.header},
}
ctx := context.Background()
ctx = prop.Extract(ctx, propagation.HeaderCarrier(header))
gotSc := trace.SpanContextFromContext(ctx)
comparer := cmp.Comparer(func(a, b trace.SpanContext) bool {
// Do not compare remote field, it is unset on empty
// SpanContext.
newA := a.WithRemote(b.IsRemote())
return newA.Equal(b)
})
if diff := cmp.Diff(gotSc, trace.NewSpanContext(tt.wantScc), comparer); diff != "" {
t.Errorf("%s: -got +want %s", tt.desc, diff)
}
})
}
}
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