使用 Go 解组 SOAP 消息

问题内容

我对 go 语言还比较陌生。

我在尝试解组 soap 消息时遇到问题。我的尝试是抽象 body 元素的内容并避免静态定义 xml 结构，因为它会根据请求的操作而变化。 不幸的是我找不到正确的方法。在示例中，getcontent 函数应接收指向包含内容的结构的指针，并将其动态添加到 body 中，以便进行填充。但结果并不是预期的。

package main

import (
    "encoding/xml"
    "fmt"
)

type Message interface{}

type EnvelopeResponse struct {
    XMLName xml.Name `xml:"http://schemas.xmlsoap.org/soap/envelope/ Envelope"`
    Body    Message  `xml:"http://schemas.xmlsoap.org/soap/envelope/ Body"`
}

type Body struct {
    XMLName xml.Name `xml:"http://schemas.xmlsoap.org/soap/envelope/ Body"`

    Fault               *Fault  `xml:",omitempty"`
    Content             Message `xml:",omitempty"`
    SOAPBodyContentType string  `xml:"-"`
}

type Fault struct {
    XMLName xml.Name `xml:"http://schemas.xmlsoap.org/soap/envelope/ Fault"`

    Code   string `xml:"faultcode,omitempty"`
    String string `xml:"faultstring,omitempty"`
    Actor  string `xml:"faultactor,omitempty"`
    Detail string `xml:"detail,omitempty"`
}

type GetHostNumberOfEntriesResponse struct {
    XMLName                xml.Name `xml:"urn:dslforum-org:service:Hosts:1 GetHostNumberOfEntriesResponse"`
    NewHostNumberOfEntries int64    `xml:"NewHostNumberOfEntries"`
}

func GetContent(rawXml []byte, content interface{}) {
    envelope := EnvelopeResponse{Body: Body{Content: content}}
    xml.Unmarshal(rawXml, &envelope)
}

func main() {
    b := []byte(`
<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:GetHostNumberOfEntriesResponse xmlns:u="urn:dslforum-org:service:Hosts:1">
<NewHostNumberOfEntries>47</NewHostNumberOfEntries>
</u:GetHostNumberOfEntriesResponse>
</s:Body>
</s:Envelope>
`)
    content := &GetHostNumberOfEntriesResponse{}
    GetContent(b, content)
    fmt.Println(*content)
}

这是操场上的示例：

https://go.dev/play/p/bbr4vexipbc

正确答案

我找到的解决方案是使用泛型来表示主体的变量和参数化内容。

此代码按我的预期工作：

package main

import (
    "encoding/xml"
    "fmt"
)

type EnvelopeResponse[T any] struct {
    XMLName xml.Name `xml:"http://schemas.xmlsoap.org/soap/envelope/ Envelope"`
    Body    Body[T]  `xml:"http://schemas.xmlsoap.org/soap/envelope/ Body"`
}

type Body[T any] struct {
    XMLName xml.Name `xml:"http://schemas.xmlsoap.org/soap/envelope/ Body"`

    Fault               *Fault `xml:",omitempty"`
    Content             T      `xml:",omitempty"`
    SOAPBodyContentType string `xml:"-"`
}

type Fault struct {
    XMLName xml.Name `xml:"http://schemas.xmlsoap.org/soap/envelope/ Fault"`

    Code   string `xml:"faultcode,omitempty"`
    String string `xml:"faultstring,omitempty"`
    Actor  string `xml:"faultactor,omitempty"`
    Detail string `xml:"detail,omitempty"`
}

type GetHostNumberOfEntriesResponse struct {
    XMLName                xml.Name `xml:"urn:dslforum-org:service:Hosts:1 GetHostNumberOfEntriesResponse"`
    NewHostNumberOfEntries int64    `xml:"NewHostNumberOfEntries"`
}

func GetContent[T any](rawXml []byte, content T) {
    envelope := EnvelopeResponse[T]{Body: Body[T]{Content: content}}
    xml.Unmarshal(rawXml, &envelope)
}

func main() {
    b := []byte(`
<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:GetHostNumberOfEntriesResponse xmlns:u="urn:dslforum-org:service:Hosts:1">
<NewHostNumberOfEntries>47</NewHostNumberOfEntries>
</u:GetHostNumberOfEntriesResponse>
</s:Body>
</s:Envelope>
`)
    content := &GetHostNumberOfEntriesResponse{}
    GetContent(b, content)
    fmt.Println(*content)
}

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