refactor: Deflake and Try package

- feat: add CI multiplier
- refactor: readability
- feat: custom Sleep function
- refactor(integration): use custom Sleep
- feat: show Try progress
- feat(try): try response with status code
- refactor(try): use a dedicate package.
- refactor(integration): Try everywhere
- feat(CI): pass CI env var to Integration Tests.
- refactor(acme): increase timeout.
- feat(acme): show Traefik logs
- refactor(integration): use `http.StatusXXX`
- refactor: remove Sleep

integration/utils/traefikCmd_test.go

@@ -70,15 +70,15 @@ func TestHelperProcess(t *testing.T) {
 		argsStr := strings.Join(args, " ")
 		switch argsStr {
 		case "an exitCode 127":
-			fmt.Fprintf(os.Stderr, "an error has occurred with exitCode 127")
+			fmt.Fprint(os.Stderr, "an error has occurred with exitCode 127")
 			os.Exit(127)
 		case "an error":
-			fmt.Fprintf(os.Stderr, "an error has occurred")
+			fmt.Fprint(os.Stderr, "an error has occurred")
 			os.Exit(1)
 		case "it works":
-			fmt.Fprintf(os.Stdout, "it works")
+			fmt.Fprint(os.Stdout, "it works")
 		default:
-			fmt.Fprintf(os.Stdout, "no arguments")
+			fmt.Fprint(os.Stdout, "no arguments")
 		}
 	default:
 		fmt.Fprintf(os.Stderr, "Command %s not found.", cmd)

integration/utils/try.go

@@ -1,50 +0,0 @@
-package utils
-
-import (
-	"errors"
-	"github.com/cenk/backoff"
-	"net/http"
-	"strconv"
-	"time"
-)
-
-// TryRequest try operation timeout, and retry backoff
-func TryRequest(url string, timeout time.Duration, condition Condition) error {
-	exponentialBackOff := backoff.NewExponentialBackOff()
-	exponentialBackOff.MaxElapsedTime = timeout
-	var res *http.Response
-	err := backoff.Retry(func() error {
-		var err error
-		res, err = http.Get(url)
-		if err != nil {
-			return err
-		}
-		return condition(res)
-	}, exponentialBackOff)
-	return err
-}
-
-// Try try operation timeout, and retry backoff
-func Try(timeout time.Duration, operation func() error) error {
-	exponentialBackOff := backoff.NewExponentialBackOff()
-	exponentialBackOff.MaxElapsedTime = timeout
-	err := backoff.Retry(operation, exponentialBackOff)
-	return err
-}
-
-// Condition is a retry condition function.
-// It receives a response, and returns an error
-// if the response failed the condition.
-type Condition func(*http.Response) error
-
-// ErrorIfStatusCodeIsNot returns a retry condition function.
-// The condition returns an error
-// if the given response's status code is not the given HTTP status code.
-func ErrorIfStatusCodeIsNot(status int) Condition {
-	return func(res *http.Response) error {
-		if res.StatusCode != status {
-			return errors.New("Bad status. Got: " + res.Status + ", expected:" + strconv.Itoa(status))
-		}
-		return nil
-	}
-}