How to custom handle errors in Golang?

The custom method for handling Golang errors is to create a custom error type and implement the error.Error interface. In practical cases, use a custom error handler to specify error information more specifically for easier debugging and handling.

#How to custom handle errors in Golang?

Golang provides built-in error handling mechanism, but sometimes you may need to customize error handling. This tutorial will teach you how to create custom error handlers and apply them in real-world use cases.

Custom error handler

To create a custom error handler, use the error.Error interface. This interface accepts a string type error description as a parameter.

package myerrors

import "fmt"

type MyError struct {
    errorString string
}

func (e *MyError) Error() string {
    return e.errorString
}

func NewMyError(errorString string) error {
    return &MyError{errorString: errorString}
}

NewMyError The function returns a MyError type that implements the error interface. Error The method returns an error description string.

Practical case: Validating user input

Suppose we have a function ValidateUserInput, which validates user input and returns an error if the input is invalid.

package main

import (
    "fmt"
    "log"

    "myerrors"
)

func ValidateUserInput(input string) error {
    if input == "" {
        return myerrors.NewMyError("输入为空")
    }

    if len(input) < 5 {
        return myerrors.NewMyError("输入长度太短")
    }

    return nil
}

func main() {
    input := "Golang"

    err := ValidateUserInput(input)
    if err != nil {
        log.Fatalf("输入验证失败: %v", err)
    }

    fmt.Println("输入已验证成功")
}

In the ValidateUserInput function, we create a custom error using the NewMyError function. We then check for errors in the main function and print the appropriate error message.

By using a custom error handler, we can specify error information more specifically, making it easier to debug and handle.

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