How to debug when developing in golang

How to debug during golang development

1. Get the Delve tool first

go get -u github.com/derekparker/delve/cmd/dlv

2. Write test code

func main(){
 http.HandleFunc("/test",func(writer http.ResponseWriter,req *http.Request){
 //TODO
 })
 log.Fatal(http.ListenAndServe("127.0.0.1:8080",nil))
}

3. Debug startup

dlv debug test.go

4. Break point

4.1): Break point for method:

b main.函数名

4.2): Run to break point:

c

4.3: Break point for a certain line:

Need to get the file Break point at the position:

b /Users/joker/go/src/…/test.go:14 对14行打断点

As for how to perform the same operation as on the ide: How to view the variables through n,s

n:相当于Java-Eclipse的F6
s:相当于Java-Eclipse的F5

: p

p testName 则会输出testName的值
args:则会输出所有方法参数信息
locals:则会输出所有的本地变量

Use go to play Debug, Info, and Error level logs

Directly upload the code:

package mylog
import (
    "log"
    "os"
)
var (
    Debug *log.Logger
    Info *log.Logger
    Error *log.Logger
)
func init() {
    log.Println("init ...")
    Debug = log.New(os.Stdout, "[DEBUG] ", log.Ldate|log.Ltime|log.Lshortfile)
    Info = log.New(os.Stdout, "[INFO] ", log.Ldate|log.Ltime|log.Lshortfile)
    Error = log.New(os.Stderr, "[ERROR] ", log.Ldate|log.Ltime|log.Lshortfile)
}
package main
import "mylog"
func main(){
  mylog.Debug.Println("good");
  mylog.Info.Println("good");
  mylog.Error.Println("good");
}

That’s it.

For more golang knowledge, please pay attention to the golang tutorial column on the PHP Chinese website.

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