This is an implementation of client-side part of XML-RPC protocol in Go.
Add dependency to your project:
go get -u alexejk.io/go-xmlrpcUse it by creating an *xmlrpc.Client and firing RPC method calls with Call().
package main
import(
"fmt"
"alexejk.io/go-xmlrpc"
)
func main() {
client, _ := xmlrpc.NewClient("https://bugzilla.mozilla.org/xmlrpc.cgi")
defer client.Close()
result := &struct {
BugzillaVersion struct {
Version string
}
}{}
_ = client.Call("Bugzilla.version", nil, result)
fmt.Printf("Version: %s\n", result.BugzillaVersion.Version)
}Customization is supported by passing a list of Option to the NewClient function.
For instance:
- To customize any aspect of
http.Clientused to perform requests, useHttpClientoption, otherwisehttp.DefaultClientwill be used - To pass custom headers, make use of
Headersoption. - To not fail parsing when unmapped fields exist in RPC responses, use
SkipUnknownFields(true)option (default isfalse)
Arguments to the remote RPC method are passed on as a *struct. This struct is encoded into XML-RPC types based on following rules:
- Order of fields in struct type matters - fields are taken in the order they are defined on the type.
- Numbers are to be specified as
int(encoded as<int>) orfloat64(encoded as<double>) - Both pointer and value references are accepted (pointers are followed to actual values)
Response is decoded following similar rules to argument encoding.
- Order of fields is important.
- Outer struct should contain exported field for each response parameter (it is possible to ignore unknown structs with
SkipUnknownFieldsoption). - Structs may contain pointers - they will be initialized if required.
- Structs may be parsed as
map[string]any, in case struct member names are not known at compile time. Map keys are enforced tostringtype.
If XML-RPC response contains no value for well-known data-types, it will be decoded into the default "empty" values as per table below:
| XML-RPC Value | Default Value |
|---|---|
<string/> |
"" |
<int/>, <i4/> |
0 |
<boolean/> |
false |
<double/> |
0.0 |
<dateTime.iso8601/> |
time.Time{} |
<base64/> |
nil |
<array><data/><array> |
nil |
As per XML-RPC specification, <struct> may not have an empty list of <member> elements, thus no default "empty" value is defined for it.
Similarly, <array/> is considered invalid.
XML-RPC specification does not necessarily specify any rules for struct's member names. Some services allow struct member names to include characters not compatible with standard Go field naming.
To support these use-cases, it is possible to remap the field by use of struct tag xmlrpc.
For example, if a response value is a struct that looks like this:
<struct>
<member>
<name>stringValue</name>
<value><string>bar</string></value>
</member>
<member>
<name>2_numeric.Value</name>
<value><i4>2</i4></value>
</member>
</struct>it would be impossible to map the second value to a Go struct with a field 2_numeric.Value as it's not valid in Go.
Instead, we can map it to any valid field as follows:
v := &struct {
StringValue string
SecondNumericValue string `xmlrpc:"2_numeric.Value"`
}{}Similarly, request encoding honors xmlrpc tags.
To build this project, simply run make all.
If you prefer building in Docker instead - make build-in-docker is your friend.
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