Return enhanced Error struct with Request and Response if available

example/example.go

@@ -5,8 +5,8 @@ import (
 	"log"
 	"time"
 
-	"github.com/hooklift/gowsdl/example/gen"
-	"github.com/hooklift/gowsdl/soap"
+	"github.com/telmate/gowsdl/example/gen"
+	"github.com/telmate/gowsdl/soap"
 )
 
 func ExampleBasicUsage() {

example/gen/gen.go

@@ -5,7 +5,7 @@ import (
 	"encoding/xml"
 	"time"
 
-	"github.com/hooklift/gowsdl/soap"
+	"github.com/telmate/gowsdl/soap"
 )
 
 // against "unused imports"

soap/soap.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"crypto/tls"
 	"encoding/xml"
+	"fmt"
 	"io/ioutil"
 	"net"
 	"net/http"
@@ -24,6 +25,15 @@ type SOAPBody struct {
 	Content interface{} `xml:",omitempty"`
 }
 
+type Error struct {
+	Err error
+	Req *http.Request
+	Res *http.Response
+}
+
+func (e *Error) Unwrap() error { return e.Err }
+func (e *Error) Error() string { return fmt.Sprintf("Soap Error: %s", e.Err) }
+
 // UnmarshalXML unmarshals SOAPBody xml
 func (b *SOAPBody) UnmarshalXML(d *xml.Decoder, _ xml.StartElement) error {
 	if b.Content == nil {
@@ -213,7 +223,7 @@ func WithHTTPHeaders(headers map[string]string) Option {
 	}
 }
 
-//HTTPClient - mockable interface
+// HTTPClient - mockable interface
 type HTTPClient interface {
 	Do(req *http.Request) (*http.Response, error)
 }
@@ -277,13 +287,13 @@ func (s *Client) Call(ctx context.Context, soapAction string, request, response
 
 	req, err := http.NewRequest("POST", s.url, buffer)
 	if err != nil {
-		return err
+		return &Error{err, req, nil}
 	}
 	if s.opts.auth != nil {
 		req.SetBasicAuth(s.opts.auth.Login, s.opts.auth.Password)
 	}
 
-	req.WithContext(ctx)
+	req = req.WithContext(ctx)
 	req.Header.Add("Content-Type", "text/xml; charset=\"utf-8\"")
 	req.Header.Add("SOAPAction", soapAction)
 	req.Header.Set("User-Agent", "gowsdl/0.1")
@@ -297,28 +307,28 @@ func (s *Client) Call(ctx context.Context, soapAction string, request, response
 
 	res, err := s.HClient.Do(req)
 	if err != nil {
-		return err
+		return &Error{err, req, res}
 	}
 	defer res.Body.Close()
 
 	rawbody, err := ioutil.ReadAll(res.Body)
 	if err != nil {
-		return err
+		return &Error{err, req, res}
 	}
 	if len(rawbody) == 0 {
-		return nil
+		return &Error{nil, req, res}
 	}
 
 	respEnvelope := new(SOAPEnvelope)
 	respEnvelope.Body = SOAPBody{Content: response}
 	err = xml.Unmarshal(rawbody, respEnvelope)
 	if err != nil {
-		return err
+		return &Error{err, req, res}
 	}
 
 	fault := respEnvelope.Body.Fault
 	if fault != nil {
-		return fault
+		return &Error{fault, req, res}
 	}
 
 	return nil