89 строки
1.5 KiB
Go
89 строки
1.5 KiB
Go
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package migrate
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import (
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"bufio"
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"fmt"
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"io"
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nurl "net/url"
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"strings"
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"time"
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)
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type MultiError struct {
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Errs []error
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}
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func NewMultiError(errs ...error) MultiError {
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compactErrs := make([]error, 0)
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for _, e := range errs {
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if e != nil {
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compactErrs = append(compactErrs, e)
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}
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}
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return MultiError{compactErrs}
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}
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func (m MultiError) Error() string {
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var strs = make([]string, 0)
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for _, e := range m.Errs {
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if len(e.Error()) > 0 {
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strs = append(strs, e.Error())
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}
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}
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return strings.Join(strs, " and ")
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}
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// suint safely converts int to uint
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// see https://goo.gl/wEcqof
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// see https://goo.gl/pai7Dr
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func suint(n int) uint {
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if n < 0 {
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panic(fmt.Sprintf("suint(%v) expects input >= 0", n))
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}
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return uint(n)
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}
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// newSlowReader turns an io.Reader into a slow io.Reader
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// use to simulate a slow internet connection
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func newSlowReader(r io.ReadCloser) io.ReadCloser {
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return &slowReader{
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rx: r,
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reader: bufio.NewReader(r),
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}
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}
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type slowReader struct {
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rx io.ReadCloser
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reader *bufio.Reader
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}
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func (b *slowReader) Read(p []byte) (n int, err error) {
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time.Sleep(10 * time.Millisecond)
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c, err := b.reader.ReadByte()
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if err != nil {
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return 0, err
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} else {
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copy(p, []byte{c})
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return 1, nil
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}
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}
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func (b *slowReader) Close() error {
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return b.rx.Close()
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}
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var ErrNoName = fmt.Errorf("no name")
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func nameFromUrl(url string) (string, error) {
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u, err := nurl.Parse(url)
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if err != nil {
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return "", err
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}
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if len(u.Scheme) == 0 {
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return "", ErrNoName
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}
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return u.Scheme, nil
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}
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