Add Consul integration tests

Signed-off-by: Emile Vauge <emile@vauge.com>

integration/utils/try.go

@@ -0,0 +1,50 @@
+package utils
+
+import (
+	"errors"
+	"github.com/cenkalti/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
+	}
+}