Update wrapper and examples

examples/client/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"time"
 
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/cmd"
@@ -11,41 +10,6 @@ import (
 	"golang.org/x/net/context"
 )
 
-// wrapper example code
-
-// log wrapper logs every time a request is made
-type logWrapper struct {
-	client.Client
-}
-
-func (l *logWrapper) Call(ctx context.Context, req client.Request, rsp interface{}) error {
-	md, _ := c.GetMetadata(ctx)
-	fmt.Printf("[Log Wrapper] ctx: %v service: %s method: %s\n", md, req.Service(), req.Method())
-	return l.Client.Call(ctx, req, rsp)
-}
-
-// trace wrapper attaches a unique trace ID - timestamp
-type traceWrapper struct {
-	client.Client
-}
-
-func (t *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}) error {
-	ctx = c.WithMetadata(ctx, map[string]string{
-		"X-Trace-Id": fmt.Sprintf("%d", time.Now().Unix()),
-	})
-	return t.Client.Call(ctx, req, rsp)
-}
-
-// Implements client.Wrapper as logWrapper
-func logWrap(c client.Client) client.Client {
-	return &logWrapper{c}
-}
-
-// Implements client.Wrapper as traceWrapper
-func traceWrap(c client.Client) client.Client {
-	return &traceWrapper{c}
-}
-
 // publishes a message
 func pub() {
 	msg := client.NewPublication("topic.go.micro.srv.example", &example.Message{
@@ -120,7 +84,6 @@ func stream() {
 
 func main() {
 	cmd.Init()
-
 	fmt.Println("\n--- Call example ---\n")
 	for i := 0; i < 10; i++ {
 		call(i)
@@ -131,19 +94,4 @@ func main() {
 
 	fmt.Println("\n--- Publisher example ---\n")
 	pub()
-
-	fmt.Println("\n--- Wrapper example ---\n")
-
-	// Wrap the default client
-	client.DefaultClient = logWrap(client.DefaultClient)
-
-	call(0)
-
-	// Wrap using client.Wrap option
-	client.DefaultClient = client.NewClient(
-		client.Wrap(traceWrap),
-		client.Wrap(logWrap),
-	)
-
-	call(1)
 }