Support none database type to disable stats/telemetry

Fixes #21

database/bolt/bolt.go

@@ -5,12 +5,10 @@ import (
 	"errors"
 	"time"
 
-	"go.etcd.io/bbolt"
-
 	"github.com/librespeed/speedtest/database/schema"
 
-	_ "github.com/go-sql-driver/mysql"
 	log "github.com/sirupsen/logrus"
+	"go.etcd.io/bbolt"
 )
 
 const (

database/database.go

@@ -4,8 +4,11 @@ import (
 	"github.com/librespeed/speedtest/config"
 	"github.com/librespeed/speedtest/database/bolt"
 	"github.com/librespeed/speedtest/database/mysql"
+	"github.com/librespeed/speedtest/database/none"
 	"github.com/librespeed/speedtest/database/postgresql"
 	"github.com/librespeed/speedtest/database/schema"
+
+	log "github.com/sirupsen/logrus"
 )
 
 var (
@@ -26,5 +29,9 @@ func SetDBInfo(conf *config.Config) {
 		DB = mysql.Open(conf.DatabaseHostname, conf.DatabaseUsername, conf.DatabasePassword, conf.DatabaseName)
 	case "bolt":
 		DB = bolt.Open(conf.DatabaseFile)
+	case "none":
+		DB = none.Open("")
+	default:
+		log.Fatalf("Unsupported database type: %s", conf.DatabaseType)
 	}
 }

database/none/none.go

@@ -0,0 +1,23 @@
+package none
+
+import (
+	"github.com/librespeed/speedtest/database/schema"
+)
+
+type None struct{}
+
+func Open(_ string) *None {
+	return &None{}
+}
+
+func (n *None) Insert(_ *schema.TelemetryData) error {
+	return nil
+}
+
+func (n *None) FetchByUUID(_ string) (*schema.TelemetryData, error) {
+	return &schema.TelemetryData{}, nil
+}
+
+func (n *None) FetchLast100() ([]schema.TelemetryData, error) {
+	return []schema.TelemetryData{}, nil
+}