Initial commit

vendor/github.com/golang-migrate/migrate/v4/database/util.go

@@ -0,0 +1,19 @@
+package database
+
+import (
+	"fmt"
+	"hash/crc32"
+	"strings"
+)
+
+const advisoryLockIdSalt uint = 1486364155
+
+// GenerateAdvisoryLockId inspired by rails migrations, see https://goo.gl/8o9bCT
+func GenerateAdvisoryLockId(databaseName string, additionalNames ...string) (string, error) {
+	if len(additionalNames) > 0 {
+		databaseName = strings.Join(append(additionalNames, databaseName), "\x00")
+	}
+	sum := crc32.ChecksumIEEE([]byte(databaseName))
+	sum = sum * uint32(advisoryLockIdSalt)
+	return fmt.Sprintf("%v", sum), nil
+}