Go给我们提供了一个非常好用的调试工具dlv（类似于gdb）。
1、delve（dlv）安装方法
dlv的具体安装方法参考：https://github.com/go-delve/delve
由于我的环境是Linux Centos环境，所以选择Linux安全，这里有两种方法，选择哪种方法都可以。
安装成功后，运行dlv命令，显示如下图所示：
2、Debug 第一个golang程序
Description：程序是从一个config.yaml文件中读取配置信息输出。
其中，config.yaml是我们的配置文件：
TimeStamp: "2018-07-16 10:23:19"
Author: "WZP"
PassWd: "Hello"
Information:
Name: "Harry"
Age: "37"
Alise:
- "Lion"
- "NK"
- "KaQS"
Image: "/path/header.rpg"
Public: false
Favorite:
Sport:
- "swimming"
- "football"
Music:
- "zui xuan min zu feng"
LuckyNumber: 99主程序main.go文件：
package main
import (
"fmt"
"log"
"github.com/spf13/viper"
)
type config struct {
v *viper.Viper
}
func LoadConfigFromYaml(c *config) error {
c.v = viper.New()
c.v.SetConfigFile("./config.yaml")
if err := c.v.ReadInConfig(); err != nil {
return err
}
age := c.v.Get("Information.Age")
name := c.v.Get("Information.Name")
log.Printf("age:%s, name:%s\n", age, name)
m := c.v.Sub("information")
log.Printf("keys:%s, image:%s", m.AllKeys(), m.Get("image"))
return nil
}
func main() {
cfg := config{v: viper.New()}
if err := LoadConfigFromYaml(&cfg); err != nil {
fmt.Println("Failed read config")
}
}
3、启动dlv debug main.go
dlv debug main.go
Type 'help' for list of commands.
(dlv) break main.main
Breakpoint 1 set at 0x97be08 for main.main() ./main.go:30
(dlv) continue
> main.main() ./main.go:30 (hits goroutine(1):1 total:1) (PC: 0x97be08)
25: m := c.v.Sub("information")
26: log.Printf("keys:%s, image:%s", m.AllKeys(), m.Get("image"))
27: return nil
28: }
29:
=> 30: func main() {
31: cfg := config{v: viper.New()}
32: if err := LoadConfigFromYaml(&cfg); err != nil {
33: fmt.Println("Failed read config")
34: }
35: }
(dlv) break main.LoadConfigFromYaml
Breakpoint 2 set at 0x97b9eb for main.LoadConfigFromYaml() ./main.go:14
(dlv) c
> main.LoadConfigFromYaml() ./main.go:14 (hits goroutine(1):1 total:1) (PC: 0x97b9eb)
9:
10: type config struct {
11: v *viper.Viper
12: }
13:
=> 14: func LoadConfigFromYaml(c *config) error {
15: c.v = viper.New()
16: c.v.SetConfigFile("./config.yaml")
17:
18: if err := c.v.ReadInConfig(); err != nil {
19: return err
(dlv) next
> main.LoadConfigFromYaml() ./main.go:15 (PC: 0x97ba0d)
10: type config struct {
11: v *viper.Viper
12: }
13:
14: func LoadConfigFromYaml(c *config) error {
=> 15: c.v = viper.New()
16: c.v.SetConfigFile("./config.yaml")
17:
18: if err := c.v.ReadInConfig(); err != nil {
19: return err
20: }
(dlv) break 21
Breakpoint 3 set at 0x97bac4 for main.LoadConfigFromYaml() ./main.go:21
(dlv) c
> main.LoadConfigFromYaml() ./main.go:21 (hits goroutine(1):1 total:1) (PC: 0x97bac4)
16: c.v.SetConfigFile("./config.yaml")
17:
18: if err := c.v.ReadInConfig(); err != nil {
19: return err
20: }
=> 21: age := c.v.Get("Information.Age")
22: name := c.v.Get("Information.Name")
23: log.Printf("age:%s, name:%s\n", age, name)
24:
25: m := c.v.Sub("information")
26: log.Printf("keys:%s, image:%s", m.AllKeys(), m.Get("image"))
(dlv) next
> main.LoadConfigFromYaml() ./main.go:22 (PC: 0x97bb0e)
17:
18: if err := c.v.ReadInConfig(); err != nil {
19: return err
20: }
21: age := c.v.Get("Information.Age")
=> 22: name := c.v.Get("Information.Name")
23: log.Printf("age:%s, name:%s\n", age, name)
24:
25: m := c.v.Sub("information")
26: log.Printf("keys:%s, image:%s", m.AllKeys(), m.Get("image"))
27: return nil
(dlv) p age
interface {}(string) "37"
(dlv) n
> main.LoadConfigFromYaml() ./main.go:23 (PC: 0x97bb55)
18: if err := c.v.ReadInConfig(); err != nil {
19: return err
20: }
21: age := c.v.Get("Information.Age")
22: name := c.v.Get("Information.Name")
=> 23: log.Printf("age:%s, name:%s\n", age, name)
24:
25: m := c.v.Sub("information")
26: log.Printf("keys:%s, image:%s", m.AllKeys(), m.Get("image"))
27: return nil
28: }
(dlv) locals
age = interface {}(string) "37"
name = interface {}(string) "Harry"
(dlv) c
2020/04/06 14:03:29 age:37, name:Harry
2020/04/06 14:03:29 keys:[alise image public name age], image:/path/header.rpg
Process 5775 has exited with status 0
简单介绍一下，上述使用的命令：
1、dlv debug main.go #debug一个main.go程序
2、break（b）main.main #在main包里的main函数入口打断点
3、continue（c） #继续运行，直到断点处停止
4、next（n） #单步运行
5、locals #打印local variables
6、print（p） #打印一个变量或者表达式
7、restart（r） #Restart Process
以上是常用的调试命令，还有一些command，可以执行dlv help查看具体用法，本篇就到这里，Done!