为 TOML 文件和 golang 解析 table 中的键值对

Question

我的 TOML 文件结构如下：

[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 gps table 和 imutable 中设置 measurement 键一次，而不是在 msgpack 和 json 和 1 和 2

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)
  }
}

然而，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）

我知道我在 struct 中没有提到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。

Answer 1

你说：

I want to set measurement key in gps table and imutable only once and not redundantly within msgpack and json and for 1 and 2

你不做这个是因为 TOML 格式的创建者说：

Because we need a decent human-readable format that unambiguously maps to a hash table and the YAML spec is like 80 pages long and gives me rage. No, JSON doesn't count. You know why.

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值

您的正确 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"

为 TOML 文件和 golang 解析 table 中的键值对

Parsing a key value pair within a table for TOML file and golang

go

toml

代码