use zap for logging (#1112)

Use zap for logging

fission/logdb/influxdb.go

@@ -19,7 +19,6 @@ package logdb
 import (
 	"encoding/json"
 	"fmt"
-	"log"
 	"net/http"
 	"net/url"
 	"sort"
@@ -30,6 +29,7 @@ import (
 	influxdbClient "github.com/influxdata/influxdb/client/v2"
 
 	"github.com/fission/fission"
+	"github.com/fission/fission/fission/log"
 )
 
 const (

fission/logdb/logdb.go

@@ -17,9 +17,8 @@ limitations under the License.
 package logdb
 
 import (
+	"fmt"
 	"time"
-
-	log "github.com/sirupsen/logrus"
 )
 
 const (
@@ -55,6 +54,5 @@ func GetLogDB(dbType string, serverURL string) (LogDatabase, error) {
 	case INFLUXDB:
 		return NewInfluxDB(serverURL)
 	}
-	log.Fatalf("Log database type is incorrect, now only support %s", INFLUXDB)
-	return nil, nil
+	return nil, fmt.Errorf("log database type is incorrect, now only support %s", INFLUXDB)
 }