golang gin framework error handling

The default error handling is errors.New("error information"). This information is returned through the return value of the error type.

Recommended:golang tutorial

A simple example:

func hello(name string) (str string, err error) { if name == "" { err = errors.New("name 不能为空") return } str = fmt.Sprintf("hello: %s", name) return }

When calling this method:

var name = "" str, err := hello(name) if err != nil { fmt.Println(err.Error()) return }

This default error handling just gets a string of error information.

Custom error handling

We define an alarm.go to handle alarms.

Without further ado, let’s just look at the code.

package alarm import ( "encoding/json" "fmt" "ginDemo/common/function" "path/filepath" "runtime" "strings" ) type errorString struct { s string } type errorInfo struct { Time string `json:"time"` Alarm string `json:"alarm"` Message string `json:"message"` Filename string `json:"filename"` Line int `json:"line"` Funcname string `json:"funcname"` } func (e *errorString) Error() string { return e.s } func New (text string) error { alarm("INFO", text) return &errorString{text} } // 发邮件 func Email (text string) error { alarm("EMAIL", text) return &errorString{text} } // 发短信 func Sms (text string) error { alarm("SMS", text) return &errorString{text} } // 发微信 func WeChat (text string) error { alarm("WX", text) return &errorString{text} } // 告警方法 func alarm(level string, str string) { // 当前时间 currentTime := function.GetTimeStr() // 定义 文件名、行号、方法名 fileName, line, functionName := "?", 0 , "?" pc, fileName, line, ok := runtime.Caller(2) if ok { functionName = runtime.FuncForPC(pc).Name() functionName = filepath.Ext(functionName) functionName = strings.TrimPrefix(functionName, ".") } var msg = errorInfo { Time : currentTime, Alarm : level, Message : str, Filename : fileName, Line : line, Funcname : functionName, } jsons, errs := json.Marshal(msg) if errs != nil { fmt.Println("json marshal error:", errs) } errorJsonInfo := string(jsons) fmt.Println(errorJsonInfo) if level == "EMAIL" { // 执行发邮件 } else if level == "SMS" { // 执行发短信 } else if level == "WX" { // 执行发微信 } else if level == "INFO" { // 执行记日志 } }

Look at how to call:

package v1 import ( "fmt" "ginDemo/common/alarm" "ginDemo/entity" "github.com/gin-gonic/gin" "net/http" ) func AddProduct(c *gin.Context) { // 获取 Get 参数 name := c.Query("name") var res = entity.Result{} str, err := hello(name) if err != nil { res.SetCode(entity.CODE_ERROR) res.SetMessage(err.Error()) c.JSON(http.StatusOK, res) c.Abort() return } res.SetCode(entity.CODE_SUCCESS) res.SetMessage(str) c.JSON(http.StatusOK, res) } func hello(name string) (str string, err error) { if name == "" { err = alarm.WeChat("name 不能为空") return } str = fmt.Sprintf("hello: %s", name) return }

Access: http://localhost:8080/v1/product/add?name=a

{ "code": 1, "msg": "hello: a", "data": null }

No error is thrown, no Information will be output.

Access: http://localhost:8080/v1/product/add

{ "code": -1, "msg": "name 不能为空", "data": null }

An error was thrown, and the output information is as follows:

{"time":"2019-07-23 22:19:17","alarm":"WX","message":"name 不能为空","filename":"绝对路径/ginDemo/router/v1/product.go","line":33,"funcname":"hello"}

panic and recover

Panic should be used to throw an error when the program cannot continue to run.

When a program panics, recover can be called inside defer (delay function) for control, but there is a prerequisite, it can only be done in the same Go coroutine.

Intentional panic:

package main import ( "fmt" ) func main() { fmt.Println("-- 1 --") defer func() { if r := recover(); r != nil { fmt.Printf("panic: %s\n", r) } fmt.Println("-- 2 --") }() panic("i am panic") }

Output:

-- 1 -- panic: i am panic -- 2 --

Intentional panic:

package main import ( "fmt" ) func main() { fmt.Println("-- 1 --") defer func() { if r := recover(); r != nil { fmt.Printf("panic: %s\n", r) } fmt.Println("-- 2 --") }() var slice = [] int {1, 2, 3, 4, 5} slice[6] = 6 }

Output:

-- 1 -- panic: runtime error: index out of range -- 2 --

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