How to remove certain items from structure received by imported package in golang?-Golang-php.cn

How to remove certain items from structure received by imported package in golang?

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Release： 2024-02-06 08:40:06

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如何从 golang 中导入的包接收的结构中删除某些项目？

Question content

I received a project from the package of an imported third-party module:

myitem := importpackage.get()

It is a structure like this:

type importedstruct struct {
    ip                  net.ip                  `json:"ip"`
    index               uint32                  `json:"index"`
    localindex          uint32                  `json:"localindex"`
    remoteindex         []*udp.addr             `json:"remoteindex"`
    certificates        *certificates           `json:"certificates"`
    vpnaddress          []iputil.vpnip          `json:"vpnaddress"`
}

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I want to delete one or more of them and return it as json from my golang gin api:

c.json(200, &myitem)

The problem is trying to find the most efficient resource utilization way to do this.

I thought about making a loop and writing the fields I need into a new structure:

newitem := make([]importedstruct, len(myitem))

i := 0
for _, v := range myitem {
    newitem[i] = ...
    ...
}

c.json(200, &hostlist)

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I also considered marshalling and then unmarshalling to assign it to another struct before returning it via the api:

// Marshal the host map to json
marshaledJson, err := json.Marshal(newItem)
if err != nil {
    log.Error(err)
    c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
    return
}

// Unmarshal the json into structs
var unmarshalledJson []ImportedStruct
err = json.Unmarshal(marshaledJson, &unmarshalledJson)
if err != nil {
    log.Error(err)
    c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
    return
}

// Return the modified host map
c.JSON(200, &unmarshalledJson)

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I'm hoping to find a more efficient way to do this. myitem could contain over 3 million lines of json and loop through everything, or marshalling and unmarshaling seems to involve more processes than just implementing something relatively simple.

EDIT: The structure is a slice ([]).

Correct answer

Define a new structure that is a copy of your existing structure with different labels:

type importedstructmarshal struct {
    ip                  net.ip                  `json:"ip"`
    index               uint32                  `json:"index"`
    localindex          uint32                  `json:"-"`
    remoteindex         []*udp.addr             `json:"remoteindex"`
    certificates        *certificates           `json:"certificates"`
    vpnaddress          []iputil.vpnip          `json:"vpnaddress"`
}

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Then, use this new structure to marshal:

var input ImportedStruct
forMarshal:=ImportedStructMarshal(input)
...

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This will work as long as the new structure is field-by-field compatible with the imported structure.

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