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middleware_test.go
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middleware_test.go
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package prometheusfiber_test
import (
"github.com/halilylm/prometheusfiber"
"io"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"testing"
"github.com/gofiber/fiber/v2"
)
func TestMiddleware(t *testing.T) {
middlewarePath := "/metrics"
skipURL := "/skip"
app := fiber.New()
middleware := prometheusfiber.NewPrometheus(
prometheusfiber.WithSubSystem("random"),
prometheusfiber.WithMetricPath(middlewarePath),
prometheusfiber.WithSkipURL(skipURL))
middleware.Use(app)
app.Get("/", func(c *fiber.Ctx) error {
return c.SendStatus(http.StatusOK)
})
app.Get(skipURL, func(c *fiber.Ctx) error {
return c.SendStatus(http.StatusOK)
})
app.Get("/status/:code", func(c *fiber.Ctx) error {
code, _ := strconv.Atoi(c.Params("code"))
if code < 200 || code > 600 {
t.Fatalf("%d is not valid http status code", code)
}
return c.SendStatus(code)
})
t.Run("successfully add metric", func(t *testing.T) {
req := makeHttpGetRequest("/")
res, _ := app.Test(req)
assertStatusCode(t, http.StatusOK, res.StatusCode)
req = makeHttpGetRequest("/status/500")
res, _ = app.Test(req)
assertStatusCode(t, http.StatusInternalServerError, res.StatusCode)
req = makeHttpGetRequest("/status/404")
res, _ = app.Test(req)
assertStatusCode(t, http.StatusNotFound, res.StatusCode)
req = makeHttpGetRequest(middlewarePath)
res, _ = app.Test(req, -1)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
assertContainsString(t, string(body), `random_requests_total{code="200",host="example.com",method="GET",url="/"} 1`)
assertContainsString(t, string(body), `random_requests_total{code="404",host="example.com",method="GET",url="/status/:code"} 1`)
assertContainsString(t, string(body), `random_requests_total{code="500",host="example.com",method="GET",url="/status/:code"} 1`)
assertContainsString(t, string(body), `random_request_size_bytes_count{code="500",method="GET",url="/status/:code"} 1`)
assertContainsString(t, string(body), `random_request_size_bytes_count{code="404",method="GET",url="/status/:code"} 1`)
assertContainsString(t, string(body), `random_request_size_bytes_count{code="200",method="GET",url="/"} 1`)
assertContainsString(t, string(body), `random_request_duration_seconds_count{code="500",method="GET",url="/status/:code"} 1`)
})
t.Run("making a request to skips urls doesn't change metrics", func(t *testing.T) {
req := makeHttpGetRequest(skipURL)
res, _ := app.Test(req)
assertStatusCode(t, http.StatusOK, res.StatusCode)
req = makeHttpGetRequest("/")
res, _ = app.Test(req)
assertStatusCode(t, http.StatusOK, res.StatusCode)
req = makeHttpGetRequest("/status/500")
res, _ = app.Test(req)
assertStatusCode(t, http.StatusInternalServerError, res.StatusCode)
req = makeHttpGetRequest("/status/404")
res, _ = app.Test(req)
assertStatusCode(t, http.StatusNotFound, res.StatusCode)
req = makeHttpGetRequest(middlewarePath)
res, _ = app.Test(req, -1)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
assertContainsString(t, string(body), `random_requests_total{code="200",host="example.com",method="GET",url="/"} 2`)
assertContainsString(t, string(body), `random_requests_total{code="404",host="example.com",method="GET",url="/status/:code"} 2`)
assertContainsString(t, string(body), `random_requests_total{code="500",host="example.com",method="GET",url="/status/:code"} 2`)
assertContainsString(t, string(body), `random_request_size_bytes_count{code="500",method="GET",url="/status/:code"} 2`)
assertContainsString(t, string(body), `random_request_size_bytes_count{code="404",method="GET",url="/status/:code"} 2`)
assertContainsString(t, string(body), `random_request_size_bytes_count{code="200",method="GET",url="/"} 2`)
assertContainsString(t, string(body), `random_request_duration_seconds_count{code="500",method="GET",url="/status/:code"} 2`)
})
}
func assertStatusCode(t testing.TB, expected, got int) {
t.Helper()
if expected != got {
t.Errorf("did not get correct status, expected %d, got %d", expected, got)
}
}
func assertContainsString(t testing.TB, haystack, needle string) {
t.Helper()
if !strings.Contains(haystack, needle) {
t.Errorf("did not find the %s in %s", needle, haystack)
}
}
func makeHttpGetRequest(path string) *http.Request {
return httptest.NewRequest(http.MethodGet, path, nil)
}