115 lines
2.5 KiB
Go
115 lines
2.5 KiB
Go
// Copyright (C) 2019 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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"fmt"
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"strings"
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"time"
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"github.com/zeebo/errs"
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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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// SplitDBURL returns the driver and DSN portions of a URL
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func SplitDBURL(s string) (string, string, error) {
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// consider https://github.com/xo/dburl if this ends up lacking
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parts := strings.SplitN(s, "://", 2)
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if len(parts) != 2 {
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return "", "", fmt.Errorf("Could not parse DB URL %s", s)
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}
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if parts[0] == "postgres" {
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parts[1] = s // postgres wants full URLS for its DSN
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}
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return parts[0], parts[1], nil
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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 ErrorGroup
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errlist.Add(errs...)
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return errlist.Finish()
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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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// ErrorGroup contains a set of non-nil errors
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type ErrorGroup errs.Group
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// Add adds an error to the ErrorGroup if it is non-nil
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func (e *ErrorGroup) Add(errrs ...error) {
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(*errs.Group)(e).Add(errrs...)
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}
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// Finish returns nil if there were no non-nil errors, the first error if there
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// was only one non-nil error, or the result of CombineErrors if there was more
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// than one non-nil error.
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func (e *ErrorGroup) Finish() error {
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return (*errs.Group)(e).Err()
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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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