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/whatsmeow
    
    the code of the file until where you have to start completion: // Copyright (c) 2021 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

// Package whatsmeow implements a client for interacting with the WhatsApp web multidevice API.
package whatsmeow

import (
	"context"
	"encoding/hex"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"runtime/debug"
	"sync"
	"sync/atomic"
	"time"

	"go.mau.fi/util/random"

	"go.mau.fi/whatsmeow/appstate"
	waBinary "go.mau.fi/whatsmeow/binary"
	waProto "go.mau.fi/whatsmeow/binary/proto"
	"go.mau.fi/whatsmeow/socket"
	"go.mau.fi/whatsmeow/store"
	"go.mau.fi/whatsmeow/types"
	"go.mau.fi/whatsmeow/types/events"
	"go.mau.fi/whatsmeow/util/keys"
	waLog "go.mau.fi/whatsmeow/util/log"
)

// EventHandler is a function that can handle events from WhatsApp.
type EventHandler func(evt interface{})
type nodeHandler func(node *waBinary.Node)

var nextHandlerID uint32

type wrappedEventHandler struct {
	fn EventHandler
	id uint32
}

type deviceCache struct {
	devices []types.JID
	dhash   string
}

// Client contains everything necessary to connect to and interact with the WhatsApp web API.
type Client struct {
	Store   *store.Device
	Log     waLog.Logger
	recvLog waLog.Logger
	sendLog waLog.Logger

	socket     *socket.NoiseSocket
	socketLock sync.RWMutex
	socketWait chan struct{}

	isLoggedIn            atomic.Bool
	expectedDisconnect    atomic.B
    
func NewClient(deviceStore *store.Device, log waLog.Logger) *Client {
	if log == nil {
		log = waLog.Noop
	}
	uniqueIDPrefix := random.Bytes(2)
	cli := &Client{
		http: &http.Client{
			Transport: (http.DefaultTransport.(*http.Transport)).Clone(),
		},
		proxy:           http.ProxyFromEnvironment,
		Store:           deviceStore,
		Log:             log,
		recvLog:         log.Sub("Recv"),
		sendLog:         log.Sub("Send"),
		uniqueID:        fmt.Sprintf("%d.%d-", uniqueIDPrefix[0], uniqueIDPrefix[1]),
		responseWaiters: make(map[string]chan<- *waBinary.Node),
		eventHandlers:   make([]wrappedEventHandler, 0, 1),
		messageRetries:  make(map[string]int),
		handlerQueue:    make(chan *waBinary.Node, handlerQueueSize),
		appStateProc:    appstate.NewProcessor(deviceStore, log.Sub("AppState")),
		socketWait:      make(chan struct{}),

		incomingRetryRequestCounter: make(map[incomingRetryKey]int),

		historySyncNotifications: make(chan *waProto.HistorySyncNotification, 32),

		groupParticipantsCache: make(map[types.JID][]types.JID),
		userDevicesCache:       make(map[types.JID]deviceCache),

		recentMessagesMap:      make(map[recentMessageKey]RecentMessage, recentMessagesSize),
		sessionRecreateHistory: make(map[types.JID]time.Time),
		GetMessageForRetry:     func(requester, to types.JID, id types.MessageID) *waProto.Message { return nil },
		appStateKeyRequests:    make(map[string]time.Time),

		pendingPhoneRerequests: make(map[types.MessageID]context.CancelFunc),

		EnableAutoReconnect:   true,
		AutoTrustIdentity:     true,
		DontSendSelfBroadcast: true,
	}
	cli.nodeHandlers = map[string]nodeHandler{
		"message":      cli.handleEncryptedMessage,
		"receipt":      cli.handleReceipt,
		"call":         cli.handleCallEvent,
		"chatstate":    cli.handleChatState,
		"presence":     cli.handlePresence,
		"notification": cli.handleNotification,
		"success":      cli.handleConnectSuccess,
		"failure":      cli.handleConnectFailure,
		"stream:error": cli.handleStreamError,
		"iq":           cli.handleIQ,
		"ib":           cli.handleIB,
		// Apparently there's also an <error> node which can have a code=479 and means "Invalid stanza sent (smax-invalid)"
	}
	return cli
}