GoLang toml踩的坑，map 和 slice

亦凉 2022-12-01 03:49 99阅读 0赞

解析下面toml文件的内容，发现有一个坑

# test.toml
    ver = "0.0.1"
    serverId = 1
    
    [servers]
        # You can indent as you please. Tabs or spaces. TOML don't care.
        [servers.alpha]
        ip = "10.0.0.1"
        dc = "eqdc10"
    
        [beta]
        ip = "10.0.0.2"
        dc = "eqdc12"
    
        [servers.omega]
        ip = "10.0.0.3"
        dc = "eqdc13"
    
    [clients]
        [[clients.clients]]
        name = "handshake"
        protoName = "bp"
        etcdAddrs = ["http://127.0.0.1:1234"]
        addrList = ["127.0.0.1:1010"]
        balancer = "ra"
    
        [[clients.clients]]
        name = "session"
        protoName = "br"
        etcdAddrs = ["http://127.0.0.1:2000"]
        addrList = ["127.0.0.1:1020"]
        balancer = "ka"

## 解决代码 ##

package main
    
    import (
    	"encoding/json"
    	"github.com/BurntSushi/toml"
    	"log"
    )
    
    type Conf2 struct { 
    	Servers map[string]Server
    	Clients *Clients
    }
    type Server struct { 
    	IP string
    	DC string
    }
    
    type Clients struct { 
    	Clients []Client
    }
    
    type Client struct { 
    	Name      string   `toml:"name"`
    	ProtoName string   `toml:"protoName"`
    	EtcdAddrs []string `toml:"etcdAddrs"`
    	AddrList  []string `toml:"addrList"`
    	Balancer  string   `toml:"balancer"`
    }
    
    func main() { 
    
    	var conf2 Conf2
    	var err2 error
    	if _, err2 = toml.DecodeFile("frontend.toml", &conf2); err2 != nil { 
    		panic(err2)
    	}
    
    	m3, err3 := json.Marshal(conf2)
    	if err3 != nil { 
    		panic(err3)
    	}
    
    	log.Println(string(m3))
    }

## 输出内容 ##

{ 
    	"Servers": { 
    		"alpha": { 
    			"IP": "10.0.0.1",
    			"DC": "eqdc10"
    		},
    		"omega": { 
    			"IP": "10.0.0.3",
    			"DC": "eqdc13"
    		}
    	},
    	"Clients": { 
    		"Clients": [{ 
    			"Name": "handshake",
    			"ProtoName": "bp",
    			"EtcdAddrs": ["http://127.0.0.1:1234"],
    			"AddrList": ["127.0.0.1:1010"],
    			"Balancer": "ra"
    		}, { 
    			"Name": "session",
    			"ProtoName": "br",
    			"EtcdAddrs": ["http://127.0.0.1:2000"],
    			"AddrList": ["127.0.0.1:1020"],
    			"Balancer": "ka"
    		}]
    	}
    }

## 注意问题 ##

*  两个\[\[和一个\[的区别，需要多一层，并且是slice，其他的是map映射
 *  如果只有一个子集，必须名字前面带上父级的东西，否则会无法读取，比如 `[beta]`
 *  可以使用 修饰词`toml:"xxx"` 来强制指定