Documentation
¶
Overview ¶
Package errors provides errors that have stack-traces.
This is particularly useful when you want to understand the state of execution when an error was returned unexpectedly.
It provides the type *Error which implements the standard golang error interface, so you can use this library interchangably with code that is expecting a normal error return.
For example:
package crashy
import "github.com/zhangdapeng520/zdpgo_nacos/errors"
var Crashed = errors.Errorf("oh dear")
func Crash() error {
return errors.New(Crashed)
}
This can be called as follows:
package main
import (
"crashy"
"fmt"
"github.com/zhangdapeng520/zdpgo_nacos/errors"
)
func main() {
err := crashy.Crash()
if err != nil {
if errors.Is(err, crashy.Crashed) {
fmt.Println(err.(*errors.Error).ErrorStack())
} else {
panic(err)
}
}
}
This package was original written to allow reporting to Bugsnag, but after I found similar packages by Facebook and Dropbox, it was moved to one canonical location so everyone can benefit.
Index ¶
Constants ¶
This section is empty.
Variables ¶
var MaxStackDepth = 50
The maximum number of stackframes on any error.
Functions ¶
Types ¶
type Error ¶
type Error struct {
Err error
// contains filtered or unexported fields
}
Error is an error with an attached stacktrace. It can be used wherever the builtin error interface is expected.
func Errorf ¶
Errorf creates a new error with the given message. You can use it as a drop-in replacement for fmt.Errorf() to provide descriptive errors in return values.
func New ¶
func New(e interface{}) *Error
New makes an Error from the given value. If that value is already an error then it will be used directly, if not, it will be passed to fmt.Errorf("%v"). The stacktrace will point to the line of code that called New.
func ParsePanic ¶
ParsePanic allows you to get an error object from the output of a go program that panicked. This is particularly useful with https://github.com/mitchellh/panicwrap.
func Wrap ¶
Wrap makes an Error from the given value. If that value is already an error then it will be used directly, if not, it will be passed to fmt.Errorf("%v"). The skip parameter indicates how far up the stack to start the stacktrace. 0 is from the current call, 1 from its caller, etc.
func WrapPrefix ¶
WrapPrefix makes an Error from the given value. If that value is already an error then it will be used directly, if not, it will be passed to fmt.Errorf("%v"). The prefix parameter is used to add a prefix to the error message when calling Error(). The skip parameter indicates how far up the stack to start the stacktrace. 0 is from the current call, 1 from its caller, etc.
func (*Error) Callers ¶
Callers satisfies the bugsnag ErrorWithCallerS() interface so that the stack can be read out.
func (*Error) ErrorStack ¶
ErrorStack returns a string that contains both the error message and the callstack.
func (*Error) Stack ¶
Stack returns the callstack formatted the same way that go does in runtime/debug.Stack()
func (*Error) StackFrames ¶
func (err *Error) StackFrames() []StackFrame
StackFrames returns an array of frames containing information about the stack.
type StackFrame ¶
type StackFrame struct {
// The path to the file containing this ProgramCounter
File string
// The LineNumber in that file
LineNumber int
// The Name of the function that contains this ProgramCounter
Name string
// The Package that contains this function
Package string
// The underlying ProgramCounter
ProgramCounter uintptr
}
A StackFrame contains all necessary information about to generate a line in a callstack.
func NewStackFrame ¶
func NewStackFrame(pc uintptr) (frame StackFrame)
NewStackFrame popoulates a stack frame object from the program counter.
func (*StackFrame) Func ¶
func (frame *StackFrame) Func() *runtime.Func
Func returns the function that contained this frame.
func (*StackFrame) SourceLine ¶
func (frame *StackFrame) SourceLine() (string, error)
SourceLine gets the line of code (from File and Line) of the original source if possible.
func (*StackFrame) String ¶
func (frame *StackFrame) String() string
String returns the stackframe formatted in the same way as go does in runtime/debug.Stack()
Source Files