Fix IcingaDB not starting without MySQL & Redis connection

fixes #9
fixes #10

connection/mysql.go

@@ -32,6 +32,7 @@ type DbTransaction interface {
 }
 
 func NewDBWrapper(dbDsn string) (*DBWrapper, error) {
+	log.Info("Connecting to MySQL")
 	db, err := mkMysql("mysql", dbDsn)
 
 	if err != nil {
@@ -43,7 +44,10 @@ func NewDBWrapper(dbDsn string) (*DBWrapper, error) {
 
 	err = dbw.Db.Ping()
 	if err != nil {
-		return nil, err
+		log.WithFields(log.Fields{
+			"context": "sql",
+			"error":   err,
+		}).Error("Could not connect to SQL. Trying again")
 	}
 
 	go func() {

connection/mysql_utils.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"github.com/go-sql-driver/mysql"
-	log "github.com/sirupsen/logrus"
 	"io/ioutil"
 	oldlog "log"
 	"reflect"
@@ -17,8 +16,6 @@ import (
 
 // mkMysql creates a new MySQL client.
 func mkMysql(dbType string, dbDsn string) (*sql.DB, error) {
-	log.Info("Connecting to MySQL")
-
 	sep := "?"
 
 	if dbDsn == "" {

connection/redis.go

@@ -95,6 +95,7 @@ func (rdbw *RDBWrapper) CompareAndSetConnected(connected bool) (swapped bool) {
 }
 
 func NewRDBWrapper(address string) (*RDBWrapper, error) {
+	log.Info("Connecting to Redis")
 	rdb := redis.NewClient(&redis.Options{
 		Addr:         address,
 		DialTimeout:  time.Minute / 2,
@@ -110,7 +111,10 @@ func NewRDBWrapper(address string) (*RDBWrapper, error) {
 
 	_, err := rdbw.Rdb.Ping().Result()
 	if err != nil {
-		return nil, err
+		log.WithFields(log.Fields{
+			"context": "redis",
+			"error":   err,
+		}).Error("Could not connect to Redis. Trying again")
 	}
 
 	go func() {