gerror

Documentation

Overview

Package gerror provides simple functions to manipulate errors.

Very note that, this package is quite a base package, which should not import extra packages except standard packages, to avoid cycle imports.

Index

• func Cause(err error) error
• func Code(err error) gcode.Code
• func Current(err error) error
• func New(text string) error
• func NewCode(code gcode.Code, text ...string) error
• func NewCodeSkip(code gcode.Code, skip int, text ...string) error
• func NewCodeSkipf(code gcode.Code, skip int, format string, args ...interface{}) error
• func NewCodef(code gcode.Code, format string, args ...interface{}) error
• func NewOption(option Option) error
• func NewSkip(skip int, text string) error
• func NewSkipf(skip int, format string, args ...interface{}) error
• func Newf(format string, args ...interface{}) error
• func Next(err error) error
• func Stack(err error) string
• func Wrap(err error, text string) error
• func WrapCode(code gcode.Code, err error, text ...string) error
• func WrapCodeSkip(code gcode.Code, skip int, err error, text ...string) error
• func WrapCodeSkipf(code gcode.Code, skip int, err error, format string, args ...interface{}) error
• func WrapCodef(code gcode.Code, err error, format string, args ...interface{}) error
• func WrapSkip(skip int, err error, text string) error
• func WrapSkipf(skip int, err error, format string, args ...interface{}) error
• func Wrapf(err error, format string, args ...interface{}) error
• type Error
  • func (err *Error) Cause() error
  • func (err *Error) Code() gcode.Code
  • func (err *Error) Current() error
  • func (err *Error) Error() string
  • func (err *Error) Format(s fmt.State, verb rune)
  • func (err *Error) MarshalJSON() ([]byte, error)
  • func (err *Error) Next() error
  • func (err *Error) Stack() string
• type Option

Examples

• NewCode
• NewCodef
• WrapCode
• WrapCodef

Functions

func Cause

func Cause(err error) error

Cause returns the root cause error of <err>.

func Code

func Code(err error) gcode.Code

Code returns the error code of current error. It returns CodeNil if it has no error code or it does not implements interface Code.

func Current

func Current(err error) error

Current creates and returns the current level error. It returns nil if current level error is nil.

func New

func New(text string) error

New creates and returns an error which is formatted from given text.

func NewCode

func NewCode(code gcode.Code, text ...string) error

NewCode creates and returns an error that has error code and given text.

Example

package main

import (
	"fmt"
	"github.com/gogf/gf/errors/gcode"
	"github.com/gogf/gf/errors/gerror"
)

func main() {
	err := gerror.NewCode(gcode.New(10000, "", nil), "My Error")
	fmt.Println(err.Error())
	fmt.Println(gerror.Code(err))

}

Output:

My Error
10000

func NewCodeSkip

func NewCodeSkip(code gcode.Code, skip int, text ...string) error

NewCodeSkip creates and returns an error which has error code and is formatted from given text. The parameter <skip> specifies the stack callers skipped amount.

func NewCodeSkipf

func NewCodeSkipf(code gcode.Code, skip int, format string, args ...interface{}) error

NewCodeSkipf returns an error that has error code and formats as the given format and args. The parameter <skip> specifies the stack callers skipped amount.

func NewCodef

func NewCodef(code gcode.Code, format string, args ...interface{}) error

NewCodef returns an error that has error code and formats as the given format and args.

Example

package main

import (
	"fmt"
	"github.com/gogf/gf/errors/gcode"
	"github.com/gogf/gf/errors/gerror"
)

func main() {
	err := gerror.NewCodef(gcode.New(10000, "", nil), "It's %s", "My Error")
	fmt.Println(err.Error())
	fmt.Println(gerror.Code(err).Code())

}

Output:

It's My Error
10000

func NewOption

func NewOption(option Option) error

NewOption creates and returns an error with Option. It is the senior usage for creating error, which is often used internally in framework.

func NewSkip

func NewSkip(skip int, text string) error

NewSkip creates and returns an error which is formatted from given text. The parameter <skip> specifies the stack callers skipped amount.

func NewSkipf

func NewSkipf(skip int, format string, args ...interface{}) error

NewSkipf returns an error that formats as the given format and args. The parameter <skip> specifies the stack callers skipped amount.

func Newf

func Newf(format string, args ...interface{}) error

Newf returns an error that formats as the given format and args.

func Next

func Next(err error) error

Next returns the next level error. It returns nil if current level error or the next level error is nil.

func Stack

func Stack(err error) string

Stack returns the stack callers as string. It returns the error string directly if the <err> does not support stacks.

func Wrap

func Wrap(err error, text string) error

Wrap wraps error with text. It returns nil if given err is nil.

func WrapCode

func WrapCode(code gcode.Code, err error, text ...string) error

WrapCode wraps error with code and text. It returns nil if given err is nil.

Example

package main

import (
	"errors"
	"fmt"
	"github.com/gogf/gf/errors/gcode"
	"github.com/gogf/gf/errors/gerror"
)

func main() {
	err1 := errors.New("permission denied")
	err2 := gerror.WrapCode(gcode.New(10000, "", nil), err1, "Custom Error")
	fmt.Println(err2.Error())
	fmt.Println(gerror.Code(err2).Code())

}

Output:

Custom Error: permission denied
10000

func WrapCodeSkip

func WrapCodeSkip(code gcode.Code, skip int, err error, text ...string) error

WrapCodeSkip wraps error with code and text. It returns nil if given err is nil. The parameter <skip> specifies the stack callers skipped amount.

func WrapCodeSkipf

func WrapCodeSkipf(code gcode.Code, skip int, err error, format string, args ...interface{}) error

WrapCodeSkipf wraps error with code and text that is formatted with given format and args. It returns nil if given err is nil. The parameter <skip> specifies the stack callers skipped amount.

func WrapCodef

func WrapCodef(code gcode.Code, err error, format string, args ...interface{}) error

WrapCodef wraps error with code and format specifier. It returns nil if given <err> is nil.

Example

package main

import (
	"errors"
	"fmt"
	"github.com/gogf/gf/errors/gcode"
	"github.com/gogf/gf/errors/gerror"
)

func main() {
	err1 := errors.New("permission denied")
	err2 := gerror.WrapCodef(gcode.New(10000, "", nil), err1, "It's %s", "Custom Error")
	fmt.Println(err2.Error())
	fmt.Println(gerror.Code(err2).Code())

}

Output:

It's Custom Error: permission denied
10000

func WrapSkip

func WrapSkip(skip int, err error, text string) error

WrapSkip wraps error with text. It returns nil if given err is nil. The parameter <skip> specifies the stack callers skipped amount.

func WrapSkipf

func WrapSkipf(skip int, err error, format string, args ...interface{}) error

WrapSkipf wraps error with text that is formatted with given format and args. It returns nil if given err is nil. The parameter <skip> specifies the stack callers skipped amount.

func Wrapf

func Wrapf(err error, format string, args ...interface{}) error

Wrapf returns an error annotating err with a stack trace at the point Wrapf is called, and the format specifier. It returns nil if given <err> is nil.

Types

type Error

type Error struct {
	// contains filtered or unexported fields
}

Error is custom error for additional features.

func (*Error) Cause

func (err *Error) Cause() error

Cause returns the root cause error.

func (*Error) Code

func (err *Error) Code() gcode.Code

Code returns the error code. It returns CodeNil if it has no error code.

func (*Error) Current

func (err *Error) Current() error

Current creates and returns the current level error. It returns nil if current level error is nil.

func (*Error) Error

func (err *Error) Error() string

Error implements the interface of Error, it returns all the error as string.

func (*Error) Format

func (err *Error) Format(s fmt.State, verb rune)

Format formats the frame according to the fmt.Formatter interface.

%v, %s : Print all the error string; %-v, %-s : Print current level error string; %+s : Print full stack error list; %+v : Print the error string and full stack error list;

func (*Error) MarshalJSON

func (err *Error) MarshalJSON() ([]byte, error)

MarshalJSON implements the interface MarshalJSON for json.Marshal. Note that do not use pointer as its receiver here.

func (*Error) Next

func (err *Error) Next() error

Next returns the next level error. It returns nil if current level error or the next level error is nil.

func (*Error) Stack

func (err *Error) Stack() string

Stack returns the stack callers as string. It returns an empty string if the <err> does not support stacks.

type Option

type Option struct {
	Error error      // Wrapped error if any.
	Stack bool       // Whether recording stack information into error.
	Text  string     // Error text, which is created by New* functions.
	Code  gcode.Code // Error code if necessary.
}

Option is option for creating error.