Golang panic recover custom exception handling

• panic

panic The word , There is panic in English 、 Panic, etc ;panic Keyword is mainly used to actively throw exceptions , similar Python Medium raise keyword

• recover

recover The word , In English, it has the function of restoring 、 Recovery, etc ; Literally , stay Go In language , Represents the restoration of the program state from a serious error to a normal state .Go In language recover The keyword is mainly used to catch exceptions , Return the program to normal , similar Python Medium except, Used to catch exceptions , You can do special operations in specific exception handling .

• Custom Recovery behavior Custom exception capture behavior

func main() {
	// Creates a router without any middleware by default
	r := gin.New()

	// Global middleware
	// Logger middleware will write the logs to gin.DefaultWriter even if you set with GIN_MODE=release.
	// By default gin.DefaultWriter = os.Stdout
	r.Use(gin.Logger())

	// Recovery middleware recovers from any panics and writes a 500 if there was one.
	r.Use(gin.CustomRecovery(func(c *gin.Context, recovered interface{}) {
		if err, ok := recovered.(string); ok {
			c.String(http.StatusInternalServerError, fmt.Sprintf("error: %s", err))
		}
		c.AbortWithStatus(http.StatusInternalServerError)
	}))

	r.GET("/panic", func(c *gin.Context) {
		// panic with a string -- the custom middleware could save this to a database or report it to the user
		panic("foo")
	})

	r.GET("/", func(c *gin.Context) {
		c.String(http.StatusOK, "ohai")
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}