Initial commit

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

@@ -0,0 +1,94 @@
+package migrate
+
+import (
+	"errors"
+	"fmt"
+	nurl "net/url"
+	"strings"
+)
+
+// MultiError holds multiple errors.
+type MultiError struct {
+	Errs []error
+}
+
+// NewMultiError returns an error type holding multiple errors.
+func NewMultiError(errs ...error) MultiError {
+	compactErrs := make([]error, 0)
+	for _, e := range errs {
+		if e != nil {
+			compactErrs = append(compactErrs, e)
+		}
+	}
+	return MultiError{compactErrs}
+}
+
+// Error implements error. Mulitple errors are concatenated with 'and's.
+func (m MultiError) Error() string {
+	var strs = make([]string, 0)
+	for _, e := range m.Errs {
+		if len(e.Error()) > 0 {
+			strs = append(strs, e.Error())
+		}
+	}
+	return strings.Join(strs, " and ")
+}
+
+// suint safely converts int to uint
+// see https://goo.gl/wEcqof
+// see https://goo.gl/pai7Dr
+func suint(n int) uint {
+	if n < 0 {
+		panic(fmt.Sprintf("suint(%v) expects input >= 0", n))
+	}
+	return uint(n)
+}
+
+var errNoScheme = errors.New("no scheme")
+var errEmptyURL = errors.New("URL cannot be empty")
+
+func sourceSchemeFromUrl(url string) (string, error) {
+	u, err := schemeFromUrl(url)
+	if err != nil {
+		return "", fmt.Errorf("source: %v", err)
+	}
+	return u, nil
+}
+
+func databaseSchemeFromUrl(url string) (string, error) {
+	u, err := schemeFromUrl(url)
+	if err != nil {
+		return "", fmt.Errorf("database: %v", err)
+	}
+	return u, nil
+}
+
+// schemeFromUrl returns the scheme from a URL string
+func schemeFromUrl(url string) (string, error) {
+	if url == "" {
+		return "", errEmptyURL
+	}
+
+	u, err := nurl.Parse(url)
+	if err != nil {
+		return "", err
+	}
+	if len(u.Scheme) == 0 {
+		return "", errNoScheme
+	}
+
+	return u.Scheme, nil
+}
+
+// FilterCustomQuery filters all query values starting with `x-`
+func FilterCustomQuery(u *nurl.URL) *nurl.URL {
+	ux := *u
+	vx := make(nurl.Values)
+	for k, v := range ux.Query() {
+		if len(k) <= 1 || (len(k) > 1 && k[0:2] != "x-") {
+			vx[k] = v
+		}
+	}
+	ux.RawQuery = vx.Encode()
+	return &ux
+}