traefik/pkg/tracing/opentelemetry/opentelemetry_test.go

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package opentelemetry_test
import (
"compress/gzip"
"context"
"encoding/json"
"io"
"net/http"
"net/http/httptest"
"testing"
"time"
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"github.com/containous/alice"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
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"github.com/traefik/traefik/v3/pkg/config/static"
tracingMiddle "github.com/traefik/traefik/v3/pkg/middlewares/tracing"
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"github.com/traefik/traefik/v3/pkg/tracing"
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"github.com/traefik/traefik/v3/pkg/tracing/opentelemetry"
"go.opentelemetry.io/collector/pdata/ptrace/ptraceotlp"
)
func TestTracing(t *testing.T) {
tests := []struct {
desc string
headers map[string]string
assertFn func(*testing.T, string)
}{
{
desc: "service name and version",
assertFn: func(t *testing.T, trace string) {
t.Helper()
assert.Regexp(t, `({"key":"service.name","value":{"stringValue":"traefik"}})`, trace)
assert.Regexp(t, `({"key":"service.version","value":{"stringValue":"dev"}})`, trace)
},
},
{
desc: "context propagation",
headers: map[string]string{
"traceparent": "00-00000000000000000000000000000001-0000000000000001-01",
"tracestate": "foo=bar",
},
assertFn: func(t *testing.T, trace string) {
t.Helper()
assert.Regexp(t, `("traceId":"00000000000000000000000000000001")`, trace)
assert.Regexp(t, `("parentSpanId":"0000000000000001")`, trace)
assert.Regexp(t, `("traceState":"foo=bar")`, trace)
},
},
}
traceCh := make(chan string)
collector := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
gzr, err := gzip.NewReader(r.Body)
require.NoError(t, err)
body, err := io.ReadAll(gzr)
require.NoError(t, err)
req := ptraceotlp.NewExportRequest()
err = req.UnmarshalProto(body)
require.NoError(t, err)
marshalledReq, err := json.Marshal(req)
require.NoError(t, err)
traceCh <- string(marshalledReq)
}))
t.Cleanup(collector.Close)
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tracingConfig := &static.Tracing{
ServiceName: "traefik",
SampleRate: 1.0,
OTLP: &opentelemetry.Config{
HTTP: &opentelemetry.HTTP{
Endpoint: collector.URL,
},
},
}
newTracing, closer, err := tracing.NewTracing(tracingConfig)
require.NoError(t, err)
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t.Cleanup(func() {
_ = closer.Close()
})
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chain := alice.New(tracingMiddle.WrapEntryPointHandler(context.Background(), newTracing, "test"))
epHandler, err := chain.Then(http.NotFoundHandler())
require.NoError(t, err)
for _, test := range tests {
t.Run(test.desc, func(t *testing.T) {
req := httptest.NewRequest(http.MethodGet, "http://www.test.com", nil)
for k, v := range test.headers {
req.Header.Set(k, v)
}
rw := httptest.NewRecorder()
epHandler.ServeHTTP(rw, req)
select {
case <-time.After(10 * time.Second):
t.Error("Trace not exported")
case trace := <-traceCh:
assert.Equal(t, http.StatusNotFound, rw.Code)
test.assertFn(t, trace)
}
})
}
}