Import/Export backend prep

internal/transfer/provider_pmapi_utils.go

@@ -0,0 +1,109 @@
+// Copyright (c) 2020 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 transfer
+
+import (
+	"io"
+	"time"
+
+	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
+	"github.com/pkg/errors"
+)
+
+const (
+	pmapiRetries          = 10
+	pmapiReconnectTimeout = 30 * time.Minute
+	pmapiReconnectSleep   = time.Minute
+)
+
+func (p *PMAPIProvider) ensureConnection(callback func() error) error {
+	var callErr error
+	for i := 1; i <= pmapiRetries; i++ {
+		callErr = callback()
+		if callErr == nil {
+			return nil
+		}
+
+		log.WithField("attempt", i).WithError(callErr).Warning("Call failed, trying reconnect")
+		err := p.tryReconnect()
+		if err != nil {
+			return err
+		}
+	}
+	return errors.Wrap(callErr, "too many retries")
+}
+
+func (p *PMAPIProvider) tryReconnect() error {
+	start := time.Now()
+	var previousErr error
+	for {
+		if time.Since(start) > pmapiReconnectTimeout {
+			return previousErr
+		}
+
+		err := p.clientManager.CheckConnection()
+		if err != nil {
+			time.Sleep(pmapiReconnectSleep)
+			previousErr = err
+			continue
+		}
+
+		break
+	}
+	return nil
+}
+
+func (p *PMAPIProvider) listMessages(filter *pmapi.MessagesFilter) (messages []*pmapi.Message, count int, err error) {
+	err = p.ensureConnection(func() error {
+		messages, count, err = p.client().ListMessages(filter)
+		return err
+	})
+	return
+}
+
+func (p *PMAPIProvider) getMessage(msgID string) (message *pmapi.Message, err error) {
+	err = p.ensureConnection(func() error {
+		message, err = p.client().GetMessage(msgID)
+		return err
+	})
+	return
+}
+
+func (p *PMAPIProvider) importRequest(req []*pmapi.ImportMsgReq) (res []*pmapi.ImportMsgRes, err error) {
+	err = p.ensureConnection(func() error {
+		res, err = p.client().Import(req)
+		return err
+	})
+	return
+}
+
+func (p *PMAPIProvider) createDraft(message *pmapi.Message, parent string, action int) (draft *pmapi.Message, err error) {
+	err = p.ensureConnection(func() error {
+		draft, err = p.client().CreateDraft(message, parent, action)
+		return err
+	})
+	return
+}
+
+func (p *PMAPIProvider) createAttachment(att *pmapi.Attachment, r io.Reader, sig io.Reader) (created *pmapi.Attachment, err error) {
+	err = p.ensureConnection(func() error {
+		created, err = p.client().CreateAttachment(att, r, sig)
+		return err
+	})
+	return
+}