mirror of
https://gitee.com/johng/gf.git
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119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gerror
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import (
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"runtime"
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)
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// stack represents a stack of program counters.
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type stack []uintptr
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const (
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// maxStackDepth marks the max stack depth for error back traces.
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maxStackDepth = 64
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)
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// Cause returns the root cause error of `err`.
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func Cause(err error) error {
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if err == nil {
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return nil
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}
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if e, ok := err.(ICause); ok {
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return e.Cause()
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}
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if e, ok := err.(IUnwrap); ok {
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return Cause(e.Unwrap())
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}
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return err
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}
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// Stack returns the stack callers as string.
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// It returns the error string directly if the `err` does not support stacks.
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func Stack(err error) string {
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if err == nil {
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return ""
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}
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if e, ok := err.(IStack); ok {
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return e.Stack()
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}
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return err.Error()
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}
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// Current creates and returns the current level error.
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// It returns nil if current level error is nil.
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func Current(err error) error {
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if err == nil {
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return nil
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}
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if e, ok := err.(ICurrent); ok {
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return e.Current()
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}
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return err
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}
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// Unwrap returns the next level error.
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// It returns nil if current level error or the next level error is nil.
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func Unwrap(err error) error {
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if err == nil {
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return nil
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}
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if e, ok := err.(IUnwrap); ok {
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return e.Unwrap()
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}
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return nil
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}
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// HasStack checks and reports whether `err` implemented interface `gerror.IStack`.
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func HasStack(err error) bool {
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_, ok := err.(IStack)
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return ok
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}
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// Equal reports whether current error `err` equals to error `target`.
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// Please note that, in default comparison logic for `Error`,
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// the errors are considered the same if both the `code` and `text` of them are the same.
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func Equal(err, target error) bool {
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if err == target {
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return true
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}
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if e, ok := err.(IEqual); ok {
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return e.Equal(target)
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}
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if e, ok := target.(IEqual); ok {
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return e.Equal(err)
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}
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return false
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}
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// Is reports whether current error `err` has error `target` in its chaining errors.
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// It is just for implements for stdlib errors.Is from Go version 1.17.
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func Is(err, target error) bool {
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if e, ok := err.(IIs); ok {
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return e.Is(target)
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}
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return false
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}
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// HasError is alias of Is, which more easily understanding semantics.
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func HasError(err, target error) bool {
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return Is(err, target)
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}
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// callers returns the stack callers.
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// Note that it here just retrieves the caller memory address array not the caller information.
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func callers(skip ...int) stack {
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var (
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pcs [maxStackDepth]uintptr
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n = 3
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)
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if len(skip) > 0 {
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n += skip[0]
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}
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return pcs[:runtime.Callers(n, pcs[:])]
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}
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