How Can xmlutil Simplify SOAP/WSDL Handling in Go?

Practical SOAP/WSDL Support for Go

While Go natively lacks WSDL support, you can manually encode and decode SOAP requests. However, this approach becomes complex due to the quirks of different SOAP servers.

Deficiencies of Standard Encoding/XML

Using the standard encoding/xml package for SOAP presents limitations:

• It requires complex struct definitions to include xsi:type attributes for elements.
• It lacks support for interface{} types.

xmlutil: A Custom Solution

To simplify SOAP handling in Go, the xmlutil package provides the following features:

• Ability to register namespaces and types for encoding/decoding with xsi:type attributes.
• Find method to locate the desired XML element within a complex SOAP response or fault.

Usage Example

The following example demonstrates encoding and decoding a SOAP request with xmlutil:

import (
    "github.com/webconnex/xmlutil"
)

type MethodCall struct {
    One string
    Two string
}

x := xmlutil.NewXmlUtil()
x.RegisterTypeMore(MethodCall{}, xml.Name{"", ""}, []xml.Attr{...})
buf := new(bytes.Buffer)
enc := x.NewEncoder(buf)
env := &Envelope{Body{MethodCall{One: "one", Two: "two"}}}
enc.Encode(env)

By utilizing the Find method, you can handle complex response structures:

dec := x.NewDecoder(bytes.NewBufferString(...))
find := []xml.Name{xml.Name{"", "MethodCallResponse"}, xml.Name{"http://www.w3.org/2003/05/soap-envelope", "Fault"}}
var start *xml.StarElement
if start, err := dec.Find(find); err != nil {...}

Conclusion

While SOAP may not be ideal, xmlutil offers a practical solution for handling SOAP/WSDL in Go, simplifying the encoding and decoding process in a flexible and efficient manner.

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