109 lines
2.0 KiB
Go
109 lines
2.0 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package utils
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import (
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"bytes"
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"encoding/gob"
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"net/url"
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"strings"
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"time"
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)
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// GetBytes transforms an empty interface type into a byte slice
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func GetBytes(key interface{}) ([]byte, error) {
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var buf bytes.Buffer
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enc := gob.NewEncoder(&buf)
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err := enc.Encode(key)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// ParseURL extracts database parameters from a string as a URL
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// bolt://storj.db
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// bolt://C:\storj.db
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// redis://hostname
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func ParseURL(s string) (*url.URL, error) {
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if strings.HasPrefix(s, "bolt://") {
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return &url.URL{
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Scheme: "bolt",
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Path: strings.TrimPrefix(s, "bolt://"),
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}, nil
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}
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return url.Parse(s)
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}
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// CombineErrors combines multiple errors to a single error
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func CombineErrors(errs ...error) error {
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var errlist combinedError
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for _, err := range errs {
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if err != nil {
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errlist = append(errlist, err)
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}
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}
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if len(errlist) == 0 {
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return nil
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} else if len(errlist) == 1 {
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return errlist[0]
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}
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return errlist
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}
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type combinedError []error
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func (errs combinedError) Cause() error {
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if len(errs) > 0 {
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return errs[0]
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}
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return nil
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}
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func (errs combinedError) Error() string {
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if len(errs) > 0 {
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limit := 5
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if len(errs) < limit {
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limit = len(errs)
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}
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allErrors := errs[0].Error()
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for _, err := range errs[1:limit] {
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allErrors += "\n" + err.Error()
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}
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return allErrors
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}
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return ""
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}
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// CollectErrors returns first error from channel and all errors that happen within duration
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func CollectErrors(errch chan error, duration time.Duration) error {
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errch = discardNil(errch)
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errs := []error{<-errch}
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timeout := time.After(duration)
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for {
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select {
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case err := <-errch:
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errs = append(errs, err)
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case <-timeout:
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return CombineErrors(errs...)
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}
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}
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}
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// discard nil errors that are returned from services
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func discardNil(ch chan error) chan error {
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r := make(chan error)
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go func() {
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for err := range ch {
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if err == nil {
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continue
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}
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r <- err
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}
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close(r)
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}()
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return r
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}
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