CocoaAsyncSocket 網絡通信使用之http協議測試(三)
通過前一篇CocoaAsyncSocket網絡通信使用之數據編碼和解碼(二),我們已經搭建好了socket的框架。
框架主要分爲以下5個模塊:
1-網絡連接模塊(socket connection)
2-數據協議框架(socket packet content protocol)
3-發送數據前的編碼模塊(socket encoder protocol)
4-接收數據後的解碼模塊(socket decoder protocol)
5-各模塊的組合調用(socket service)
簡述:
通過5個模塊的協同工作,可以方便的處理tcp通信的擴展。
因爲不方便公開外網服務,不能很好的測試自定義協議的編碼器/解碼器,
只是簡單的對網絡連接成功做了打印,現在我們來實踐下框架的擴展用法。
http(HyperText Transport Protocol,超文本傳輸協議)
其實現在網上隨處可見http協議的服務,而http是基於tcp/ip的,我們正好可以借用http來實踐我們的用法。
現在就針對http協議來實現我們的編碼器/解碼器。
http協議內容很多,本文主要是測試sokcet框架,確認框架的完整性,拓展性,具體協議內容請自行搜索(http協議格式)。
以下是實現編碼器/解碼器時,學習的網址:(強烈建議學習一下,否則不好理解http編碼器/解碼器的內容哦)
http://blog.csdn.net/gueter/article/details/1524447
http協議的測試[編碼器/解碼器]
代碼中只是測試用例,並非真實完整實現,看官勿噴。
RHPacketHttpRequest.h文件:(http協議的測試請求包)
#import "RHPacketBody.h"
@interface RHPacketHttpRequest : RHPacketBody
@property (nonatomic, copy) NSString *requestPath;
@property (nonatomic, copy) NSString *host;
@property (nonatomic, copy) NSString *connection;
@end
RHPacketHttpRequest.m文件:(只是測試,默認寫了幾個請求參數)
#import "RHPacketHttpRequest.h"
@implementation RHPacketHttpRequest
- (instancetype)init
{
if (self = [super init]) {
_requestPath = @"GET /index.html HTTP/1.1";
_host = @"Host:www.baidu.com";
_connection = @"Connection:close";
}
return self;
}
- (NSData *)data
{
NSData *crlfData = [@"\r\n" dataUsingEncoding:NSASCIIStringEncoding];<span style="font-family: Arial, Helvetica, sans-serif;">//回車換行是http協議中每個字段的分隔符</span>
NSMutableData *packetData = [[NSMutableData alloc] init];
[packetData appendData:[_requestPath dataUsingEncoding:NSASCIIStringEncoding]];
[packetData appendData:crlfData];
[packetData appendData:[_host dataUsingEncoding:NSASCIIStringEncoding]];
[packetData appendData:crlfData];
[packetData appendData:[_connection dataUsingEncoding:NSASCIIStringEncoding]];
[packetData appendData:crlfData];
// [packetData appendData:[@"Accept:image/webp,*/*;q=0.8" dataUsingEncoding:NSASCIIStringEncoding]];
// [packetData appendData:crlfData];
return packetData;
}
@end
RHSocketHttpEncoder.h文件:(http協議的測試編碼器)
#import <Foundation/Foundation.h>
#import "RHSocketEncoderProtocol.h"
@interface RHSocketHttpEncoder : NSObject <RHSocketEncoderProtocol>
@end
RHSocketHttpEncoder.m文件:
#import "RHSocketHttpEncoder.h"
#import "RHSocketConfig.h"
@implementation RHSocketHttpEncoder
- (void)encodePacket:(id<RHSocketPacketContent>)packet encoderOutput:(id<RHSocketEncoderOutputDelegate>)output
{
NSData *data = [packet data];
NSMutableData *sendData = [NSMutableData dataWithData:data];
NSData *crlfData = [@"\r\n" dataUsingEncoding:NSASCIIStringEncoding];//回車換行是http協議中每個字段的分隔符,也是請求的結束符
[sendData appendData:crlfData];
NSTimeInterval timeout = [packet timeout];
NSInteger tag = [packet tag];
RHSocketLog(@"tag:%ld, timeout: %f, data: %@", (long)tag, timeout, sendData);
[output didEncode:sendData timeout:timeout tag:tag];
}
@end
RHSocketHttpDecoder.h文件:(http協議的測試解碼器)
#import <Foundation/Foundation.h>
#import "RHSocketDecoderProtocol.h"
@interface RHSocketHttpDecoder : NSObject <RHSocketDecoderProtocol>
@end
RHSocketHttpDecoder.m文件:
#import "RHSocketHttpDecoder.h"
#import "RHSocketConfig.h"
#import "RHPacketHttpResponse.h"
@interface RHSocketHttpDecoder ()
{
NSMutableData *_receiveData;
}
@end
@implementation RHSocketHttpDecoder
- (NSUInteger)decodeData:(NSData *)data decoderOutput:(id<RHSocketDecoderOutputDelegate>)output tag:(long)tag
{
@synchronized(self) {
if (_receiveData) {
[_receiveData appendData:data];
} else {
_receiveData = [NSMutableData dataWithData:data];
}
NSUInteger dataLen = _receiveData.length;
NSInteger headIndex = 0;
int crlfCount = 0;
for (NSInteger i=0; i<dataLen; i++) {
uint8_t byte;
[_receiveData getBytes:&byte range:NSMakeRange(i, 1)];
if (byte == 0x0a) {//0x0a是http協議中的字段分隔符,我們只是測試程序,簡單解析對應返回數據,然後打印
crlfCount++;
}
if (crlfCount == 2) {
NSInteger packetLen = i - headIndex;
NSData *packetData = [_receiveData subdataWithRange:NSMakeRange(headIndex, packetLen)];
RHPacketHttpResponse *rsp = [[RHPacketHttpResponse alloc] initWithData:packetData];
[output didDecode:rsp tag:0];
headIndex = i + 1;
crlfCount = 0;
}
}
NSData *remainData = [_receiveData subdataWithRange:NSMakeRange(headIndex, dataLen-headIndex)];
[_receiveData setData:remainData];
return _receiveData.length;
}//@synchronized
}
@end
測試調用方法:
NSString *host = @"www.baidu.com";
int port = 80;
[RHSocketService sharedInstance].encoder = [[RHSocketHttpEncoder alloc] init];
[RHSocketService sharedInstance].decoder = [[RHSocketHttpDecoder alloc] init];
[[RHSocketService sharedInstance] startServiceWithHost:host port:port];
也可以繼承RHSocketService對象,重載裏面的接口方法,增加短線重連等等邏輯。
總結:
以上就是針對http協議實現的測試代碼,我們可以看到,socket框架中的代碼無需修改,完全可以共用。
這樣以後即使是不同應用,不同的業務協議,也不需要重複造輪子了。
文章中都是以代碼的方式呈現的,習慣看代碼的同學可能比較易懂,但是缺乏整體框架的說明描述。
下一篇,針對當前的框架,繪製uml類圖結構。
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