initial commit

core/util/util.go

@@ -0,0 +1,46 @@
+package util
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"time"
+)
+
+func Round64(input float64) int64 {
+	if input < 0 {
+		return int64(input - 0.5)
+	}
+	return int64(input + 0.5)
+}
+
+func TimeToMs(date time.Time) int64 {
+	return date.UnixNano() / 1000000
+}
+
+func MsToTime(ms int64) time.Time {
+	return time.Unix(0, ms*1000000)
+}
+
+func NewGuid() (string, error) {
+	byteArray := make([]byte, 16)
+
+	_, err := rand.Read(byteArray)
+
+	if err != nil {
+		return "", err
+	}
+
+	return hex.EncodeToString(byteArray), nil
+}
+
+func NewInviteId() (string, error) {
+	byteArray := make([]byte, 4)
+
+	_, err := rand.Read(byteArray)
+
+	if err != nil {
+		return "", err
+	}
+
+	return hex.EncodeToString(byteArray), nil
+}