golang catch global errors

Golang is a modern programming language that is designed to be an efficient solution that allows programmers to easily manage and write large-scale programs. Golang is good at concurrent programming and is widely used in some high-availability applications. However, when developing any application, we must always pay attention to error handling, because not handling errors may cause unstable system behavior. In this article, we will discuss how to catch global errors in Golang.

Error handling is an important part of writing high-quality applications. In Golang, there are two error types:

One is an error type that can be defined in the general form of a function signature. These errors are errors that functions may throw.

The other is a run-time error, such as a null pointer reference or infinite loop.

No matter what type of error it is, you must be careful when writing your program. A general error handling method is to use a global ErrorHandler. A global ErrorHandler can catch errors program-wide. This is a very good choice because it can handle all errors in one place.

First, we need to define a global ErrorHandler:

func globalErrorHandler(err error) {
    fmt.Printf("Recovered from panic, error message: %v", err)
}

Next, we can call the recovery function in the main function. This function registers the global ErrorHandler:

func main() {
    defer func() {
        if err := recover(); err != nil {
            globalErrorHandler(fmt.Errorf("%v", err))
        }
    }()
    // your code here
}

Here we use the defer keyword to ensure that our ErrorHandler is called before the function ends. This approach ensures that even if an error is thrown by the main function or any other code, we can catch and handle it in time.

After registering the ErrorHandler, we can use Golang's panic mechanism to simulate errors. If panic is called, the globalErrorHandler we defined will be automatically called. We can then print the details of the error in the ErrorHandler or send it to the logging system for subsequent debugging.

To test the ErrorHandler, we can write a simple function:

func someFunc() {
    a := []int{1, 2, 3}
    fmt.Println(a[5])
}

When we use an index outside the slice range in the function, panic will occur. At this point we can test the ErrorHandler to make sure it catches errors correctly.

Finally, we integrate these into a sample program:

package main

import (
    "fmt"
)

func globalErrorHandler(err error) {
    fmt.Printf("Recovered from panic, error message: %v", err)
}

func someFunc() {
    a := []int{1, 2, 3}
    fmt.Println(a[5])
}

func main() {
    defer func() {
        if err := recover(); err != nil {
            globalErrorHandler(fmt.Errorf("%v", err))
        }
    }()
    someFunc()
}

Now we can call other functions in the main function and trigger an error by trying to use an invalid index . At this time, the global ErrorHandler we defined will capture the error information and print it out.

In short, Golang is an efficient programming language, and its concurrent programming capabilities are excellent. But whether in concurrent programming or other application scenarios, we need to handle errors carefully. When handling errors, using a global ErrorHandler is a very good solution as it ensures that all errors we catch in our application are handled centrally.

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