SocketRocket
SocketRocket是Facebook开源的一个用于 iOS, macOS and tvOS客户端的websocket框架。
- 集成
使用cocoapods 只需要在podfile文件中加入
pod 'SocketRocket'
然后执行pod install就可以了
不使用cocoapods 添加文件 把下面的三个文件拖入项目中
其中,SocketRocket.h文件是用来引入框架的所有类的文件,就像
<UIKit/UIkit.h>
目前,这个文件只引入了一个类,所以只有一行代码
<SocketRocket/SRWebSocket.h>
这样的话,编译会报错,因为并没有一个SocketRocket的framework,需要把这一行代码改为
#import "SRWebSocket.h"
添加依赖库 在Build Phases -> Link Binary With Libraries里加入如下frameworks:
libicucore.dylib CFNetwork.framework Security.framework Foundation.framework
- 使用
初始化 初始化方法分为两类: 通过传入NSURLRequest的对象进行初始化
-(id)initWithURLRequest:(NSURLRequest *)request protocols:(NSArray *)protocols allowsUntrustedSSLCertificates:(BOOL)allowsUntrustedSSLCertificates;
-(id)initWithURLRequest:(NSURLRequest *)request protocols:(NSArray *)protocols;
-(id)initWithURLRequest:(NSURLRequest *)request;
通过传入NSURL的对象进行初始化
-(id)initWithURL:(NSURL *)url protocols:(NSArray *)protocols allowsUntrustedSSLCertificates:(BOOL)allowsUntrustedSSLCertificates;
-(id)initWithURL:(NSURL *)url protocols:(NSArray *)protocols;
-(id)initWithURL:(NSURL *)url;
其中,使用NSURLRequest进行初始化可以自定义请求超时时间
[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:timeoutInterval]
打开连接
使用第一步创建出来的SRWebSocket对象(以下简称‘对象’)调用- (void)open来与服务器建立连接。这里需要注意
// SRWebSockets are intended for one-time-use only. Open should be called once and only once.
一个对象只能调用一次
- (void)open
调用过open后,对象的readyState就为SR_CONNECTING,如果再调用open,就会
NSAssert(_readyState == SR_CONNECTING, @"Cannot call -(void)open on SRWebSocket more than once");
发送数据
使用对象调用
- (void)send:(id)data
这个data可以是一个UTF8的字符串或者NSData对象
关闭连接
使用对象调用
- (void)close
来关闭一个连接。
回调
以delegate的方式进行回调,包括下面几个回调函数
@protocol SRWebSocketDelegate <NSObject>
-(void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message;
@optional
-(void)webSocketDidOpen:(SRWebSocket *)webSocket;
-(void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error;
-(void)webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean;
-(void)webSocket:(SRWebSocket *)webSocket didReceivePong:(NSData *)pongPayload;
-(BOOL)webSocketShouldConvertTextFrameToString:(SRWebSocket *)webSocket;
@end
其中,
webSocketDidOpen表示与服务器的连接建立成功,这时就可以与服务器进行交互了。
didFailWithError表示连接出现错误,包括连接没有成功建立的错误、网络错误等。如果需要进行重连,应该在这里进行,可以采用Demo里面的方式进行重连:把以后的对象置空->重新初始化->调用open。应用切到后台2分钟以后才会出现连接错误的回调。
SocketRocket已经对消息的收发进行了处理。我们收到和发出的消息都是根据socket头进行分隔的,所以不会出现消息不完整或者多条消息同时收发的问题。
上面是在使用SocketRocket的过程中的总结,通过这些应该可以把这个框架使用起来,以后有时间会继续钻研这个框架的源码。SocketRocket还是挺好用的。
一个工具类
SocketRocketUtility.h
#import <Foundation/Foundation.h>
#import "SocketRocket.h"
extern NSString * const kNeedPayOrderNote;
extern NSString * const kWebSocketDidOpenNote;
extern NSString * const kWebSocketDidCloseNote;
extern NSString * const kWebSocketdidReceiveMessageNote;
@interface SocketRocketUtility : NSObject
// 获取连接状态
@property (nonatomic,assign,readonly) SRReadyState socketReadyState;
+ (SocketRocketUtility *)instance;
-(void)SRWebSocketOpen;//开启连接
-(void)SRWebSocketClose;//关闭连接
- (void)sendData:(id)data;//发送数据
@end
SocketRocketUtility.w
#import "SocketRocketUtility.h"
#define SERVER_URL @"ws://192.168.5.130:3000"
#define dispatch_main_async_safe(block)\
if ([NSThread isMainThread]) {\
block();\
} else {\
dispatch_async(dispatch_get_main_queue(), block);\
}
NSString * const kNeedPayOrderNote = @"kNeedPayOrderNote";
NSString * const kWebSocketDidOpenNote = @"kWebSocketdidReceiveMessageNote";
NSString * const kWebSocketDidCloseNote = @"kWebSocketDidCloseNote";
NSString * const kWebSocketdidReceiveMessageNote = @"kWebSocketdidReceiveMessageNote";
@interface SocketRocketUtility()<SRWebSocketDelegate>
{
int _index;
NSTimer * heartBeat;
NSTimeInterval reConnectTime;
}
@property (nonatomic,strong) SRWebSocket *socket;
@end
@implementation SocketRocketUtility
+(SocketRocketUtility *)instance{
static SocketRocketUtility *Instance = nil;
static dispatch_once_t predicate;
dispatch_once(&predicate, ^{
Instance = [[SocketRocketUtility alloc] init];
});
return Instance;
}
#pragma mark - **************** public methods
-(void)SRWebSocketOpen{
//如果是同一个url return
if (self.socket) {
return;
}
self.socket = [[SRWebSocket alloc] initWithURLRequest:
[NSURLRequest requestWithURL:[NSURL URLWithString:SERVER_URL]]];//这里填写你服务器的地址
NSLog(@"请求的websocket地址:%@",self.socket.url.absoluteString);
self.socket.delegate = self; //SRWebSocketDelegate 协议
[self.socket open]; //开始连接
}
-(void)SRWebSocketClose{
if (self.socket){
[self.socket close];
self.socket = nil;
//断开连接时销毁心跳
[self destoryHeartBeat];
}
}
#define WeakSelf(ws) __weak __typeof(&*self)weakSelf = self
- (void)sendData:(id)data {
NSLog(@"socketSendData --------------- %@",data);
WeakSelf(ws);
dispatch_queue_t queue = dispatch_queue_create("zy", NULL);
dispatch_async(queue, ^{
if (weakSelf.socket != nil) {
// 只有 SR_OPEN 开启状态才能调 send 方法啊,不然要崩
if (weakSelf.socket.readyState == SR_OPEN) {
[weakSelf.socket send:data]; // 发送数据
} else if (weakSelf.socket.readyState == SR_CONNECTING) {
NSLog(@"正在连接中,重连后其他方法会去自动同步数据");
// 每隔2秒检测一次 socket.readyState 状态,检测 10 次左右
// 只要有一次状态是 SR_OPEN 的就调用 [ws.socket send:data] 发送数据
// 如果 10 次都还是没连上的,那这个发送请求就丢失了,这种情况是服务器的问题了,小概率的
// 代码有点长,我就写个逻辑在这里好了
[self reConnect];
} else if (weakSelf.socket.readyState == SR_CLOSING || weakSelf.socket.readyState == SR_CLOSED) {
// websocket 断开了,调用 reConnect 方法重连
NSLog(@"重连");
[self reConnect];
}
} else {
NSLog(@"没网络,发送失败,一旦断网 socket 会被我设置 nil 的");
NSLog(@"其实最好是发送前判断一下网络状态比较好,我写的有点晦涩,socket==nil来表示断网");
}
});
}
#pragma mark - **************** private mothodes
//重连机制
- (void)reConnect
{
[self SRWebSocketClose];
//超过一分钟就不再重连 所以只会重连5次 2^5 = 64
if (reConnectTime > 64) {
//您的网络状况不是很好,请检查网络后重试
return;
}
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(reConnectTime * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.socket = nil;
[self SRWebSocketOpen];
NSLog(@"重连");
});
//重连时间2的指数级增长
if (reConnectTime == 0) {
reConnectTime = 2;
}else{
reConnectTime *= 2;
}
}
//取消心跳
- (void)destoryHeartBeat
{
dispatch_main_async_safe(^{
if (heartBeat) {
if ([heartBeat respondsToSelector:@selector(isValid)]){
if ([heartBeat isValid]){
[heartBeat invalidate];
heartBeat = nil;
}
}
}
})
}
//初始化心跳
- (void)initHeartBeat
{
dispatch_main_async_safe(^{
[self destoryHeartBeat];
//心跳设置为3分钟,NAT超时一般为5分钟
heartBeat = [NSTimer timerWithTimeInterval:3 target:self selector:@selector(sentheart) userInfo:nil repeats:YES];
//和服务端约定好发送什么作为心跳标识,尽可能的减小心跳包大小
[[NSRunLoop currentRunLoop] addTimer:heartBeat forMode:NSRunLoopCommonModes];
})
}
-(void)sentheart{
//发送心跳 和后台可以约定发送什么内容 一般可以调用ping 我这里根据后台的要求 发送了data给他
[self sendData:@"heart"];
}
//pingPong
- (void)ping{
if (self.socket.readyState == SR_OPEN) {
[self.socket sendPing:nil];
}
}
#pragma mark - socket delegate
- (void)webSocketDidOpen:(SRWebSocket *)webSocket {
//每次正常连接的时候清零重连时间
reConnectTime = 0;
//开启心跳
[self initHeartBeat];
if (webSocket == self.socket) {
NSLog(@"************************** socket 连接成功************************** ");
[[NSNotificationCenter defaultCenter] postNotificationName:kWebSocketDidOpenNote object:nil];
}
}
- (void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error {
if (webSocket == self.socket) {
NSLog(@"************************** socket 连接失败************************** ");
_socket = nil;
//连接失败就重连
[self reConnect];
}
}
- (void)webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean {
if (webSocket == self.socket) {
NSLog(@"************************** socket连接断开************************** ");
NSLog(@"被关闭连接,code:%ld,reason:%@,wasClean:%d",(long)code,reason,wasClean);
[self SRWebSocketClose];
[[NSNotificationCenter defaultCenter] postNotificationName:kWebSocketDidCloseNote object:nil];
}
}
/*该函数是接收服务器发送的pong消息,其中最后一个是接受pong消息的,
在这里就要提一下心跳包,一般情况下建立长连接都会建立一个心跳包,
用于每隔一段时间通知一次服务端,客户端还是在线,这个心跳包其实就是一个ping消息,
我的理解就是建立一个定时器,每隔十秒或者十五秒向服务端发送一个ping消息,这个消息可是是空的
*/
-(void)webSocket:(SRWebSocket *)webSocket didReceivePong:(NSData *)pongPayload{
NSString *reply = [[NSString alloc] initWithData:pongPayload encoding:NSUTF8StringEncoding];
NSLog(@"reply===%@",reply);
}
- (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message {
if (webSocket == self.socket) {
NSLog(@"************************** socket收到数据了************************** ");
NSLog(@"我这后台约定的 message 是 json 格式数据收到数据,就按格式解析吧,然后把数据发给调用层");
NSLog(@"message:%@",message);
[[NSNotificationCenter defaultCenter] postNotificationName:kWebSocketdidReceiveMessageNote object:message];
}
}
#pragma mark - **************** setter getter
- (SRReadyState)socketReadyState{
return self.socket.readyState;
}
-(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end
使用工具类连接服务端
#import "ViewController.h"
#import "SocketRocketUtility.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[[SocketRocketUtility instance] SRWebSocketOpen];//打开soket
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(SRWebSocketDidOpen) name:@"kWebSocketDidOpenNote" object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(SRWebSocketDidReceiveMsg:) name:@"kWebSocketdidReceiveMessageNote" object:nil];
// [[SocketRocketUtility instance] SRWebSocketClose]; 在需要得地方 关闭socket
}
- (void)SRWebSocketDidOpen {
NSLog(@"开启成功");
//在成功后需要做的操作。。。
}
- (void)SRWebSocketDidReceiveMsg:(NSNotification *)note {
//收到服务端发送过来的消息
NSString * message = note.object;
NSLog(@"%@",message);
}
@end