traefik/pkg/tracing/opentelemetry/opentelemetry_test.go

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package opentelemetry
import (
"compress/gzip"
"context"
"encoding/json"
"io"
"net/http"
"net/http/httptest"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
mtracing "github.com/traefik/traefik/v2/pkg/middlewares/tracing"
"github.com/traefik/traefik/v2/pkg/tracing"
"go.opentelemetry.io/collector/pdata/ptrace/ptraceotlp"
)
func TestTraceContextPropagation(t *testing.T) {
t.Parallel()
ts := 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)
bodyStr := string(marshalledReq)
assert.Regexp(t, `("traceId":"00000000000000000000000000000001")`, bodyStr)
assert.Regexp(t, `("parentSpanId":"0000000000000001")`, bodyStr)
assert.Regexp(t, `("traceState":"foo=bar")`, bodyStr)
}))
defer ts.Close()
cfg := Config{
Address: strings.TrimPrefix(ts.URL, "http://"),
Insecure: true,
}
newTracing, err := tracing.NewTracing("", 0, &cfg)
require.NoError(t, err)
defer newTracing.Close()
req := httptest.NewRequest(http.MethodGet, "http://www.test.com", nil)
req.Header.Set("traceparent", "00-00000000000000000000000000000001-0000000000000001-00")
req.Header.Set("tracestate", "foo=bar")
rw := httptest.NewRecorder()
var forwarded bool
next := http.HandlerFunc(func(http.ResponseWriter, *http.Request) {
forwarded = true
})
handler := mtracing.NewEntryPoint(context.Background(), newTracing, "test", next)
handler.ServeHTTP(rw, req)
require.True(t, forwarded)
}