Failed posts and failover for export loggers

utils/failover_export.go

@@ -0,0 +1,70 @@
+/*
+Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
+Copyright (C) ITsysCOM GmbH
+
+This program 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.
+
+This program 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 this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package utils
+
+import (
+	"encoding/gob"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type FailoverPoster struct {
+	MessageProvider
+}
+
+func NewFailoverPoster( /*addMsg *MessageProvider*/ ) *FailoverPoster {
+	return new(FailoverPoster)
+}
+
+func (fldPst *FailoverPoster) AddMessage(failedPostDir, kafkaConn,
+	kafkaTopic string, content interface{}) (err error) {
+	filePath := filepath.Join(failedPostDir, kafkaTopic+PipeSep+MetaKafka+GOBSuffix)
+	var fileOut *os.File
+	if _, err = os.Stat(filePath); os.IsNotExist(err) {
+		fileOut, err = os.Create(filePath)
+		if err != nil {
+			return fmt.Errorf(fmt.Sprintf("<Kafka> failed to write logs to file <%s> because <%s>", filePath, err))
+		}
+	} else {
+		fileOut, err = os.OpenFile(filePath, os.O_RDWR|os.O_APPEND, 0755)
+		if err != nil {
+			return err
+		}
+	}
+	enc := gob.NewEncoder(fileOut)
+	if err = enc.Encode(content); err != nil {
+		return err
+	}
+	fileOut.Close()
+	return
+}
+
+type MessageProvider interface {
+	GetContent() string
+	GetMeta() string
+}
+
+func (fldPst *FailoverPoster) GetContent() string {
+	return EmptyString
+}
+
+func (fldPst *FailoverPoster) GetMeta() string {
+	return EmptyString
+}