GODT-35: Finish all details and make tests pass

pkg/pmapi/manager_ping.go

@@ -1,11 +1,60 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
 package pmapi
 
-import "context"
+import (
+	"context"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	// retryConnectionSleeps defines a smooth cool down in seconds.
+	retryConnectionSleeps = []int{2, 5, 10, 30, 60} // nolint[gochecknoglobals]
+)
+
+func (m *manager) pingUntilSuccess() {
+	attempt := 0
+	for {
+		err := m.testPing(context.Background())
+		if err == nil {
+			return
+		}
+
+		waitTime := getRetryConnectionSleep(attempt)
+		attempt++
+		logrus.WithError(err).WithField("attempt", attempt).WithField("wait", waitTime).Debug("Connection not available")
+		time.Sleep(waitTime)
+	}
+}
+
+func getRetryConnectionSleep(idx int) time.Duration {
+	if idx >= len(retryConnectionSleeps) {
+		idx = len(retryConnectionSleeps) - 1
+	}
+	sec := retryConnectionSleeps[idx]
+	return time.Duration(sec) * time.Second
+}
 
 func (m *manager) testPing(ctx context.Context) error {
 	if _, err := m.r(ctx).Get("/tests/ping"); err != nil {
 		return err
 	}
-
 	return nil
 }