add support for time cost

dump.go

@@ -3,6 +3,7 @@ package req
 import (
 	"bufio"
 	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
@@ -84,8 +85,10 @@ type dumpBuffer struct {
 }
 
 func (b *dumpBuffer) Write(p []byte) {
+	if b.Len() > 0 {
+		b.Buffer.WriteString("\r\n\r\n")
+	}
 	b.Buffer.Write(p)
-	b.Buffer.WriteString("\r\n\r\n")
 }
 
 func (b *dumpBuffer) WriteString(s string) {
@@ -189,8 +192,17 @@ func (r *Resp) dumpResponse(dump *dumpBuffer) {
 	}
 }
 
+// Cost return the time cost of the request
+func (r *Resp) Cost() time.Duration {
+	return r.cost
+}
+
+// Dump dump the request
 func (r *Resp) Dump() string {
 	dump := new(dumpBuffer)
+	if r.r.flag&Lcost != 0 {
+		dump.WriteString(fmt.Sprint(r.cost))
+	}
 	r.dumpRequest(dump)
 	l := dump.Len()
 	if l > 0 {

req.go

@@ -320,7 +320,15 @@ func (r *Req) Do(method, rawurl string, vs ...interface{}) (resp *Resp, err erro
 		resp.client = r.Client()
 	}
 
-	response, err := resp.client.Do(req)
+	var response *http.Response
+	if r.flag&Lcost != 0 {
+		before := time.Now()
+		response, err = resp.client.Do(req)
+		after := time.Now()
+		resp.cost = after.Sub(before)
+	} else {
+		response, err = resp.client.Do(req)
+	}
 	if err != nil {
 		return nil, err
 	}

resp.go

@@ -18,6 +18,7 @@ type Resp struct {
 	req    *http.Request
 	resp   *http.Response
 	client *http.Client
+	cost   time.Duration
 	*multipartHelper
 	reqBody          []byte
 	respBody         []byte
@@ -149,7 +150,11 @@ var regNewline = regexp.MustCompile(`\n|\r`)
 
 func (r *Resp) autoFormat(s fmt.State) {
 	req := r.req
-	fmt.Fprint(s, req.Method, " ", req.URL.String())
+	if r.r.flag&Lcost != 0 {
+		fmt.Fprint(s, req.Method, " ", req.URL.String(), " ", r.cost)
+	} else {
+		fmt.Fprint(s, req.Method, " ", req.URL.String())
+	}
 
 	// test if it is should be outputed pretty
 	var pretty bool
@@ -180,7 +185,11 @@ func (r *Resp) autoFormat(s fmt.State) {
 
 func (r *Resp) miniFormat(s fmt.State) {
 	req := r.req
-	fmt.Fprint(s, req.Method, " ", req.URL.String())
+	if r.r.flag&Lcost != 0 {
+		fmt.Fprint(s, req.Method, " ", req.URL.String(), " ", r.cost)
+	} else {
+		fmt.Fprint(s, req.Method, " ", req.URL.String())
+	}
 	if r.r.flag&LreqBody != 0 && len(r.reqBody) > 0 { // request body
 		str := regNewline.ReplaceAllString(string(r.reqBody), " ")
 		fmt.Fprint(s, " ", str)
@@ -191,6 +200,7 @@ func (r *Resp) miniFormat(s fmt.State) {
 	}
 }
 
+// Format fort the response
 func (r *Resp) Format(s fmt.State, verb rune) {
 	if r == nil || r.req == nil {
 		return