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TOML 文件的结构如下：

[database]
host = "localhost"
port = 8086
https = true
username = "root"
password = "root"
db = "test"

[cloud]
deviceType = "2be386e9bbae"
deviceId = "119a705fa3b1"
password = "test"
token = "dqpx5vNLLTR34"
endpoint = "mqtts://mqtt1.endpoint.com"

[gps]
#measurement = "gps"
  [gps.msgpack]
  topic = "/evt/gps/msgpack"

  [gps.json]
  topic = "/evt/gps/json"

[imu]
#measurement = "imu"
  [imu.1]
    tag = "NODE1"
    topic = "/evt/imu1/msgpack"
  [imu.2]
    tag = "NODE2"
    topic = "/evt/imu2/msgpack"

我只想在表和表中设置一次measurement键，而不是在and和 for and中重复设置gpsimumsgpackjson12

使用注释掉的键以下代码有效

代码

package main

import (
  "fmt"
  "github.com/BurntSushi/toml"
)

type imu struct {
  Topic string
  Measurement string
  Tag string
}

type gps struct {
  // Measurement string
  Measurement string
  ETopic string `toml:"topic"`
}

type database struct {
  Host  string
  Port  int
  Https bool
  Username  string
  Password  string
  Dbname  string
}

type cloud struct {
  Devicetype  string
  DeviceId  string
  Password  string
  Token   string
  Endpoint  string
}

type tomlConfig struct {
  DB database `toml:"database"`
  Cloud cloud `toml:"cloud"`
  Gps map[string]gps `toml:"gps"`
  Imu map[string]imu  `toml:"imu"`
}


func main()  {

  var config tomlConfig

  if _, err := toml.DecodeFile("cloud.toml", &config); err != nil {
    fmt.Println(err)
    return
  }
  // fmt.Printf("%#v\n", config)
  for sensorName, sensor := range config.Imu {
    fmt.Printf("Topic: %s %s %s %s\n", sensorName, sensor.Topic, sensor.Tag, sensor.Measurement)
  }

  for types, gps := range config.Gps {
    fmt.Printf("%s\n", types)
    fmt.Printf("%s\n", gps.ETopic)
  }
}

但是，在取消注释键值对时，我得到以下信息：

 toml: type mismatch for main.gps: expected table but found string

（它应该仍然是一个有效的 TOML，因为我将它翻译成 JSON 并检查了结构）

我知道我没有在其中提到struct我需要为它添加一个字符串。但是，我对结构现在应该是什么样子感到困惑。

4

1 回答 1

2

你说：

我想在 gps 表中设置测量键，并且只在 msgpack 和 json 以及 1 和 2 中设置一次不可变而不是冗余

你不这样做是因为 TOML 格式的创建者说：

因为我们需要一种体面的人类可读格式，它可以明确地映射到哈希表，而 YAML 规范大约有 80 页长，这让我很生气。不，JSON 不算数。你知道为什么。

如果您需要对一个键具有相同的值，例如，measurement您必须在每个子表中指定您想要的

您正确的 TOML 文件：

[database]
host = "localhost"
port = 8086
https = true
username = "root"
password = "root"
db = "test"

[cloud]
deviceType = "2be386e9bbae"
deviceId = "119a705fa3b1"
password = "test"
token = "dqpx5vNLLTR34"
endpoint = "mqtts://mqtt1.endpoint.com"

[gps]
[gps.msgpack]
topic = "/evt/gps/msgpack"
measurement = "gps"

[gps.json]
topic = "/evt/gps/json"
measurement = "gps"

[imu]
[imu.1]
measurement = "imu"
tag = "NODE1"
topic = "/evt/imu1/msgpack"
[imu.2]
measurement = "imu"
tag = "NODE2"
topic = "/evt/imu2/msgpack"
于 2018-12-25T11:19:43.420 回答