dso15221
2018-10-05 13:55
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在Golang中处理多个错误的最佳做法

I am writing some code that parses a YAML file and validates the data inside. Each parser returns an error if the value found does not meet the requirements. Right now I am creating an array of errors and setting the return of each call to a different index in the array. My current implementation is working, but it seems wrong and I want to see if there is a better way to accomplish this.

Here is an example

func createStruct(yamlMap map[interface{}]interface{}) (myStruct, error) {
    errs := make([]error, 6)
    s := myStruct{}

    s.Name, errs[0] = getString(yamlMap, "name", true)
    s.Tag, errs[1] = getIntValidRange(yamlMap, "tag", 1, 4094, true)
    s.TaggedPorts, errs[2] = getStringPortList(yamlMap, "tagged_ports", true)
    s.UntaggedPorts, errs[3] = getStringPortList(yamlMap, "untagged_ports", true)
    s.IP, errs[4] = getIPString(yamlMap, "ip", true)
    s.Netmask, errs[5] = getIPString(yamlMap, "netmask", true)

    return s, structCreateErrorChecker(errs)
}

The reason I don't handle each error after each function, is because I want to try to parse everything first and then collect all errors and log them. That is what structCreateErrorChecker() does.

Here is the YAML I am trying to parse (it's come up in the comments). When I say dynamic I mean that there can be any number of these controlling_bridge sections and each vlan section can have any number of vlans.

controlling_bridge_1:
    ip:    "1.1.1.1"
    ports: ["1","2"]
    vlans:
        vlan01:
            name:  "vlan1"
            tag:   1001
            ports: ["1"]
            ip:    "2.2.2.2"
        vlan02:
            name:  "vlan02"
            tag:   1002
            ports: ["3", "4"]
            ip:    "3.3.3.1"

controlling_bridge_2:
    ip:    "1.1.1.1"
    ports: ["1","2"]
    vlans:
        vlan01:
            name:  "vlan1"
            tag:   1001
            ports: ["1"]
            ip:    "2.2.2.2"
        vlan02:
            name:  "vlan02"
            tag:   1002
            ports: ["3", "4"]
            ip:    "3.3.3.1"

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我正在编写一些代码来解析YAML文件并验证其中的数据。 如果找到的值不符合要求，则每个解析器都将返回错误。 现在，我正在创建一个错误数组，并将每个调用的返回值设置为数组中的另一个索引。 我当前的实现工作正常，但似乎出错了，我想看看是否有更好的方法来完成此操作。

这里是一个示例 

  func createStruct（yamlMap map [interface {}] interface {}）（myStruct，error）{
错误：= make（[] error，6）
s：= myStruct {} 
 
 s。 名称，错误[0] = getString（yamlMap，“名称”，true）
 s.Tag，错误[1] = getIntValidRange（yamlMap，“ tag”，1，4094，true）
 s.TaggedPorts，错误[  2] = getStringPortList（yamlMap，“ tagged_ports”，true）
 s.UntaggedPorts，errs [3] = getStringPortList（yamlMap，“ untagged_ports”，true）
 s.IP，errs [4] = getIPString（yamlMap，“  ip“，true）
 s.Netmask，错误[5] = getIPString（yamlMap，” netmask“，true）
 
返回s，structCreateErrorChecker（errs）
} 
    
 
 
我不处理每个函数后的每个错误的原因是因为我想先解析所有错误，然后收集所有错误并记录下来。 那就是structCreateErrorChecker（）的作用。 
 
 
这是我要解析的YAML（它出现在注释中）。 当我说动态时，我的意思是说，controlling_bridge节可以有任意数量，每个vlan节可以有任意数量的vlan。 
 
 
  controlling_bridge_1：
 ip：“ 1.1。  1.1“ 
端口：[” 1“，” 2“] 
 vlans：
 vlan01：
名称：” vlan1“ 
标签：1001 
端口：[” 1“] 
 ip：” 2.2  .2.2“ 
 vlan02：
名称：” vlan02“ 
标签：1002 
端口：[” 3“，” 4“] 
 ip：” 3.3.3.1“ 
 
controlling_bridge_2：
 ip：  “ 1.1.1.1” 
端口：[“ 1”，“ 2”] 
 vlans：
 vlan01：
名称：“ vlan1” 
标签：1001 
端口：[“ 1”] 
 ip  ：“ 2.2.2.2” 
 vlan02：
名称：“ vlan02” 
标签：1002 
端口：[“ 3”，“ 4”] 
 ip：“ 3.3.3.1”
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1条回答 默认 最新

  • duanao6704 2018-10-05 18:31
    最佳回答

    There is no official yaml library, but gopkg.in/yaml.v2 is a good choice. To unmarshal the given yaml you can define structs and add yaml tags to the attributes.

    By using maps for your bridges and vlans and using arrays for the ports you can unmarshal the data without a problem.

    As you are using maps, keep in mind that iterating over a map does not guarantee the order of returned elements.

    This program would unmarshal your given structure:

    package main

import (
    "fmt"
    "log"

    yaml "gopkg.in/yaml.v2"
)

var data = `
controlling_bridge_1:
    ip:    "1.1.1.1"
    ports: ["1","2"]
    vlans:
        vlan01:
            name:  "vlan1"
            tag:   1001
            ports: ["1"]
            ip:    "2.2.2.2"
        vlan02:
            name:  "vlan02"
            tag:   1002
            ports: ["3", "4"]
            ip:    "3.3.3.1"

controlling_bridge_2:
    ip:    "1.1.1.1"
    ports: ["1","2"]
    vlans:
        vlan01:
            name:  "vlan1"
            tag:   1001
            ports: ["1"]
            ip:    "2.2.2.2"
        vlan02:
            name:  "vlan02"
            tag:   1002
            ports: ["3", "4"]
            ip:    "3.3.3.1"
`

type Bridge struct {
    IP    string   `yaml:"ip"`
    Ports []string `yaml:"ports"`
    Vlans map[string]Vlan
}

type Vlan struct {
    Name  string   `yaml:"name"`
    Tag   string   `yaml:"tag"`
    Ports []string `yaml:"ports"`
    IP    string   `yaml:"ip"`
}

func main() {
    bridges := map[string]Bridge{}

    err := yaml.Unmarshal([]byte(data), &bridges)
    if err != nil {
        log.Fatalf("error: %v", err)
    }

    fmt.Printf("%+v
", bridges)
}
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