xrequesttrace/xrequesttrace_test.go at master · sp-jcberleur/xrequesttrace · GitHub

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package xrequesttrace_test

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/sp-jcberleur/xrequesttrace"
)

func TestNotExists(t *testing.T) {
	cfg := xrequesttrace.CreateConfig()

	ctx := context.Background()
	next := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {})

	handler, err := xrequesttrace.New(ctx, next, cfg, "xrequesttrace-plugin")
	if err != nil {
		t.Fatal(err)
	}

	recorder := httptest.NewRecorder()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "http://localhost", nil)
	if err != nil {
		t.Fatal(err)
	}

	handler.ServeHTTP(recorder, req)

	//assertHeader(t, req, "X-Request-ID", "")
}

func TestTraceExistsMatch(t *testing.T) {
	cfg := xrequesttrace.CreateConfig()

	ctx := context.Background()
	next := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {})

	handler, err := xrequesttrace.New(ctx, next, cfg, "xrequesttrace-plugin")
	if err != nil {
		t.Fatal(err)
	}

	recorder := httptest.NewRecorder()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "http://localhost", nil)
	if err != nil {
		t.Fatal(err)
	}
	req.Header["traceparent"] = []string{"00-12345678901234567890123456789012-1234567890123456-01"}

	handler.ServeHTTP(recorder, req)

	assertHeader(t, req, "X-Request-ID", "12345678901234567890123456789012")
}

func TestTraceExistsNotMatch(t *testing.T) {
	cfg := xrequesttrace.CreateConfig()

	ctx := context.Background()
	next := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {})

	handler, err := xrequesttrace.New(ctx, next, cfg, "xrequesttrace-plugin")
	if err != nil {
		t.Fatal(err)
	}

	recorder := httptest.NewRecorder()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "http://localhost", nil)
	if err != nil {
		t.Fatal(err)
	}
	req.Header["traceparent"] = []string{"not-matching-header"}

	handler.ServeHTTP(recorder, req)

	assertHeader(t, req, "X-Request-ID", "")
}

func TestRequestIdAlreadyExists(t *testing.T) {
	cfg := xrequesttrace.CreateConfig()

	ctx := context.Background()
	next := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {})

	handler, err := xrequesttrace.New(ctx, next, cfg, "xrequesttrace-plugin")
	if err != nil {
		t.Fatal(err)
	}

	recorder := httptest.NewRecorder()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "http://localhost", nil)
	if err != nil {
		t.Fatal(err)
	}
	req.Header["X-Request-ID"] = []string{"123"}
	req.Header["traceparent"] = []string{"00-12345678901234567890123456789012-1234567890123456-01"}

	handler.ServeHTTP(recorder, req)

	assertHeader(t, req, "X-Request-ID", "123")
}

func assertHeader(t *testing.T, req *http.Request, key, expected string) {
	t.Helper()

	values := req.Header[key]
	value := ""
	if len(values) > 0 {
		value = values[0]
	}
	if value != expected {
		t.Errorf("invalid header value: got %#v expected %#v", value, expected)
	}
}