gerror

package
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 Go to latest Published: Mar 7, 2023 License: MIT Imports: 10 Imported by: 12

Documentation

Overview

Package gerror provides rich functionalities to manipulate errors.

For maintainers, please very note that, this package is quite a basic package, which SHOULD NOT import extra packages except standard packages and internal packages, to avoid cycle imports.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

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 neither it does not implement 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 Equal 

func Equal(err, target error) bool

Equal reports whether current error `err` equals to error `target`. Please note that, in default comparison logic for `Error`, the errors are considered the same if both the `code` and `text` of them are the same.

Example 
package main

import (
	"errors"
	"fmt"

	"github.com/wowqhb/gf/v2/errors/gcode"
	"github.com/wowqhb/gf/v2/errors/gerror"
)

func main() {
	err1 := errors.New("permission denied")
	err2 := gerror.New("permission denied")
	err3 := gerror.NewCode(gcode.CodeNotAuthorized, "permission denied")
	fmt.Println(gerror.Equal(err1, err2))
	fmt.Println(gerror.Equal(err2, err3))

}

Output:

true
false

func HasCode 

func HasCode(err error, code gcode.Code) bool

HasCode checks and reports whether `err` has `code` in its chaining errors.

func HasError 

func HasError(err, target error) bool

HasError is alias of Is, which more easily understanding semantics.

func HasStack 

func HasStack(err error) bool

HasStack checks and reports whether `err` implemented interface `gerror.IStack`.

func Is 

func Is(err, target error) bool

Is reports whether current error `err` has error `target` in its chaining errors. It is just for implements for stdlib errors.Is from Go version 1.17.

Example 
package main

import (
	"errors"
	"fmt"

	"github.com/wowqhb/gf/v2/errors/gerror"
)

func main() {
	err1 := errors.New("permission denied")
	err2 := gerror.Wrap(err1, "operation failed")
	fmt.Println(gerror.Is(err1, err1))
	fmt.Println(gerror.Is(err2, err2))
	fmt.Println(gerror.Is(err2, err1))
	fmt.Println(gerror.Is(err1, err2))

}

Output:

false
true
true
false

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/wowqhb/gf/v2/errors/gcode"
	"github.com/wowqhb/gf/v2/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/wowqhb/gf/v2/errors/gcode"
	"github.com/wowqhb/gf/v2/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 a custom 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 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 Unwrap 

func Unwrap(err error) error

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

func Wrap 

func Wrap(err error, text string) error

Wrap wraps error with text. It returns nil if given err is nil. Note that it does not lose the error code of wrapped error, as it inherits the error code from it.

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/wowqhb/gf/v2/errors/gcode"
	"github.com/wowqhb/gf/v2/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/wowqhb/gf/v2/errors/gcode"
	"github.com/wowqhb/gf/v2/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. Note that it does not lose the error code of wrapped error, as it inherits the error code from it.

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. Note that it does not lose the error code of wrapped error, as it inherits the error code from it.

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. Note that it does not lose the error code of wrapped error, as it inherits the error code from it.

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) Equal 

func (err *Error) Equal(target error) bool

Equal reports whether current error `err` equals to error `target`. Please note that, in default comparison for `Error`, the errors are considered the same if both the `code` and `text` of them are the same.

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) Is 

func (err *Error) Is(target error) bool

Is reports whether current error `err` has error `target` in its chaining errors. It is just for implements for stdlib errors.Is from Go version 1.17.

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) SetCode 

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

SetCode updates the internal code with given code.

func (*Error) Stack 

func (err *Error) Stack() string

Stack returns the error stack information as string.

func (*Error) Unwrap 

func (err *Error) Unwrap() error

Unwrap is alias of function `Next`. It is just for implements for stdlib errors.Unwrap from Go version 1.17.

type ICause 

type ICause interface {
	Error() string
	Cause() error
}

ICause is the interface for Cause feature.

type ICode 

type ICode interface {
	Error() string
	Code() gcode.Code
}

ICode is the interface for Code feature.

type ICurrent 

type ICurrent interface {
	Error() string
	Current() error
}

ICurrent is the interface for Current feature.

type IEqual 

type IEqual interface {
	Error() string
	Equal(target error) bool
}

IEqual is the interface for Equal feature.

type IIs 

type IIs interface {
	Error() string
	Is(target error) bool
}

IIs is the interface for Is feature.

type IStack 

type IStack interface {
	Error() string
	Stack() string
}

IStack is the interface for Stack feature.

type IUnwrap 

type IUnwrap interface {
	Error() string
	Unwrap() error
}

IUnwrap is the interface for Unwrap feature.

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.

Source Files

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