You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client.go
    path of file: ./repos/stack-rpc-tutorials/examples/wrapper/call
    
    the code of the file until where you have to start completion: package main

import (
	"context"
	"fmt"
	"github.com/stack-labs/stack-rpc"
	"time"

	proto "github.com/stack-labs/stack-rpc-tutorials/examples/proto/service/rpc"
	"github.com/stack-labs/stack-rpc/client"
	log "github.com/stack-labs/stack-rpc/logger"
	"github.com/stack-labs/stac
    
func NewCallWrapper2() client.CallWrapper {
	return func(cf client.CallFunc) client.CallFunc {
		return func(ctx context.Context, node *registry.Node, req client.Request, rsp interface{}, opts client.CallOptions) error {
			log.Info("[NewCallWrapper2] Wrapper工作：", node.Address)

			newMd, b := metadata.FromContext(ctx)
			if !b {
				newMd = metadata.Metadata{}
			}
			newMd["call-wrapped2"] = "call-wrapped-value2"
			ctx = metadata.NewContext(ctx, newMd)
			err := cf(ctx, node, req, rsp, opts)
			return err
		}
	}
}