73c30590e0
Merge in DNS/adguard-home from 2276-fix-lint-4 to master Updates #2276. Squashed commit of the following: commit 15d49184cd8ce1f8701bf3221e69418ca1778b36 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Tue Dec 8 15:51:34 2020 +0300 util: fix naming commit 3b9a86a0feb8c6e0b167e6e23105e8137b0dda76 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Tue Dec 8 15:41:10 2020 +0300 all: fix lint and naming issues vol. 4
74 lines
1.6 KiB
Go
74 lines
1.6 KiB
Go
// Package agherr contains the extended error type, and the function for
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// wrapping several errors.
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package agherr
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import (
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"fmt"
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"strings"
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)
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// Error is the constant error type.
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type Error string
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// Error implements the error interface for Error.
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func (err Error) Error() (msg string) {
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return string(err)
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}
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// manyError is an error containing several wrapped errors. It is created to be
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// a simpler version of the API provided by github.com/joomcode/errorx.
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type manyError struct {
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message string
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underlying []error
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}
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// Many wraps several errors and returns a single error.
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func Many(message string, underlying ...error) error {
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err := &manyError{
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message: message,
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underlying: underlying,
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}
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return err
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}
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// Error implements the error interface for *manyError.
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func (e *manyError) Error() string {
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switch len(e.underlying) {
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case 0:
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return e.message
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case 1:
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return fmt.Sprintf("%s: %s", e.message, e.underlying[0])
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default:
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b := &strings.Builder{}
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// Ignore errors, since strings.(*Buffer).Write never returns
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// errors.
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_, _ = fmt.Fprintf(b, "%s: %s (hidden: %s", e.message, e.underlying[0], e.underlying[1])
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for _, u := range e.underlying[2:] {
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// See comment above.
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_, _ = fmt.Fprintf(b, ", %s", u)
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}
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// See comment above.
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_, _ = b.WriteString(")")
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return b.String()
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}
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}
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// Unwrap implements the hidden errors.wrapper interface for *manyError.
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func (e *manyError) Unwrap() error {
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if len(e.underlying) == 0 {
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return nil
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}
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return e.underlying[0]
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}
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// wrapper is a copy of the hidden errors.wrapper interface for tests, linting,
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// etc.
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type wrapper interface {
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Unwrap() error
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}
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