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package xmlrpc
import (
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/http/cookiejar"
"net/rpc"
"net/url"
"sync"
)
type Client struct {
*rpc.Client
}
// clientCodec is rpc.ClientCodec interface implementation.
type clientCodec struct {
// url presents url of xmlrpc service
url *url.URL
// httpClient works with HTTP protocol
httpClient *http.Client
// cookies stores cookies received on last request
cookies http.CookieJar
// responses presents map of active requests. It is required to return request id, that
// rpc.Client can mark them as done.
responses map[uint64]*http.Response
mutex sync.Mutex
response Response
// ready presents channel, that is used to link request and it`s response.
ready chan uint64
// close notifies codec is closed.
close chan uint64
}
func (codec *clientCodec) WriteRequest(request *rpc.Request, args interface{}) (err error) {
httpRequest, err := NewRequest(codec.url.String(), request.ServiceMethod, args)
if err != nil {
return err
}
if codec.cookies != nil {
for _, cookie := range codec.cookies.Cookies(codec.url) {
httpRequest.AddCookie(cookie)
}
}
var httpResponse *http.Response
httpResponse, err = codec.httpClient.Do(httpRequest)
if err != nil {
return err
}
if codec.cookies != nil {
codec.cookies.SetCookies(codec.url, httpResponse.Cookies())
}
codec.mutex.Lock()
codec.responses[request.Seq] = httpResponse
codec.mutex.Unlock()
codec.ready <- request.Seq
return nil
}
func (codec *clientCodec) ReadResponseHeader(response *rpc.Response) (err error) {
var seq uint64
select {
case seq = <-codec.ready:
case <-codec.close:
return errors.New("codec is closed")
}
response.Seq = seq
codec.mutex.Lock()
httpResponse := codec.responses[seq]
delete(codec.responses, seq)
codec.mutex.Unlock()
defer httpResponse.Body.Close()
if httpResponse.StatusCode < 200 || httpResponse.StatusCode >= 300 {
response.Error = fmt.Sprintf("request error: bad status code - %d", httpResponse.StatusCode)
return nil
}
body, err := ioutil.ReadAll(httpResponse.Body)
if err != nil {
response.Error = err.Error()
return nil
}
resp := Response(body)
if err := resp.Err(); err != nil {
response.Error = err.Error()
return nil
}
codec.response = resp
return nil
}
func (codec *clientCodec) ReadResponseBody(v interface{}) (err error) {
if v == nil {
return nil
}
return codec.response.Unmarshal(v)
}
func (codec *clientCodec) Close() error {
if transport, ok := codec.httpClient.Transport.(*http.Transport); ok {
transport.CloseIdleConnections()
}
close(codec.close)
return nil
}
// NewClient returns instance of rpc.Client object, that is used to send request to xmlrpc service.
func NewClient(requrl string, transport http.RoundTripper) (*Client, error) {
if transport == nil {
transport = http.DefaultTransport
}
httpClient := &http.Client{Transport: transport}
jar, err := cookiejar.New(nil)
if err != nil {
return nil, err
}
u, err := url.Parse(requrl)
if err != nil {
return nil, err
}
codec := clientCodec{
url: u,
httpClient: httpClient,
close: make(chan uint64),
ready: make(chan uint64),
responses: make(map[uint64]*http.Response),
cookies: jar,
}
return &Client{rpc.NewClientWithCodec(&codec)}, nil
}
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