前言

公司最近剛剛趕完一個(gè)版本需求粟耻，準(zhǔn)備對(duì)AFNetworking進(jìn)行升級(jí)。其實(shí)年前就做過這方面研究眉踱，當(dāng)時(shí)是因?yàn)橛袀餮?017年后蘋果要求升級(jí)https而老的網(wǎng)絡(luò)底層不支持挤忙，必須升級(jí)。后來(lái)因?yàn)樾滦枨蟊容^趕勋锤，又在網(wǎng)上找到可靠消息說網(wǎng)上都是謠傳并沒有強(qiáng)制升級(jí)于是就擱置了下來(lái)饭玲。

簡(jiǎn)介

AFNetworking是對(duì)IOS本身網(wǎng)絡(luò)請(qǐng)求的封裝，有兩種方式NSURLConnection和NSURLSession叁执。

因?yàn)锳FNetworking1.0就是構(gòu)建于NSURLConnection之上的茄厘，等到AFNetworking2.0才NSURLSession的方式矮冬，之后的AFNEtworking3.0更去掉了NSURLConnection的方式。關(guān)于原因可以點(diǎn)擊這里次哈。

所以這一次我的主要任務(wù)就是從之前的NSURLConnection（AFHTTPRequestOperationManager）升級(jí)到NSURLSession（AFHTTPSessionManager）胎署。

當(dāng)前網(wǎng)絡(luò)層

剛開始我得先把當(dāng)前的網(wǎng)絡(luò)層理一下，看下哪些地方用到網(wǎng)絡(luò)請(qǐng)求窑滞。最后發(fā)現(xiàn)也復(fù)雜琼牧，一共兩種不一樣的地方：
1.最主要的一個(gè)就是對(duì)一般網(wǎng)絡(luò)POST請(qǐng)求的封裝。
2.上傳一些諸如圖片哀卫、音頻等文件的PUT請(qǐng)求巨坊。

看上去挺簡(jiǎn)單的，但因?yàn)榇a經(jīng)過多代人之手此改，難免有些冗余代碼質(zhì)量也不是特別高趾撵，就像上傳附件的封裝就有兩份在程序中都有用到，為了盡量不產(chǎn)生新問題我也就對(duì)它們都做修改共啃。

下面是之前的實(shí)現(xiàn)方式的主要流程占调，一些代碼上的坑我就不放出來(lái)了。

1.首先是一般網(wǎng)絡(luò)POST請(qǐng)求的封裝移剪。

（1）首先是單例的實(shí)現(xiàn)基礎(chǔ)設(shè)置:

+ (instancetype) sharedClient{
    
    static NetworkManager *_sharedClient = nil;
    static dispatch_once_t _onceTocken;
    dispatch_once(&_onceTocken, ^{
        
        if (appDelegate.apiBaseUrlStr) {
            _sharedClient = [[NetworkManager alloc] initWithBaseURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",appDelegate.apiBaseUrlStr]]];
        } else {
            _sharedClient = [[NetworkManager alloc] initWithBaseURL:[NSURL URLWithString:@"(null)"]];
        }
        _sharedClient.llOperationQueue = [[NSOperationQueue alloc] init];
        //最大并發(fā)數(shù)
        _sharedClient.llOperationQueue.maxConcurrentOperationCount = NSOperationQueueDefaultMaxConcurrentOperationCount;
        [_sharedClient.requestSerializer setValue:@"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
        [_sharedClient.requestSerializer setValue:ApiVersion forHTTPHeaderField:@"User-Agent"];
        [_sharedClient.requestSerializer setTimeoutInterval:30];
        _sharedClient.bstart = NO;
        _sharedClient.apiCount = 0;
    });
    
    return _sharedClient;
}

（2）POST請(qǐng)求對(duì)外接口：

- (NSURLSessionDataTask *)POST:(NSString *)URLString
                parameters:(id)parameters
                  progress:(void (^)(NSProgress * _Nonnull))uploadProgress
                success:(nullable void (^)(NSURLSessionDataTask * _Nonnull, id _Nonnull))success
                failure:(nullable void (^)(NSURLSessionDataTask * _Nullable, NSError * _Nonnull))failure
{
    if (![CommonClass checkNetworkRechable]) {
        failure(nil,[NSError errorWithDomain:@"www.mHealth.com" code:-1009 userInfo:nil]);
        return nil;
    }
    if((!appDelegate.apiBaseUrlStr || appDelegate.apiBaseUrlStr.length < 1) && !_bstart)
    {
#ifdef DEBUG_MODE
        NSLog(@"No baseurl, need network access");
#endif
        
        [self.llOperationQueue setSuspended:true];
        LandbalancerSessionOperation *llsessionOperation = [[LandbalancerSessionOperation alloc] initWithURLString:URLString parameters:parameters success:success failure:failure];
        [self.llOperationQueue addOperation:llsessionOperation];
        
        _bstart = true;
        [self requestApi];
        
        return nil;
    }
    else
    {
        return [super POST:URLString parameters:parameters progress:uploadProgress success:success failure:failure];
    }
}

這邊有個(gè)判斷究珊，如果沒有baseurl，則要把當(dāng)次請(qǐng)求先掛起纵苛，先去請(qǐng)求version接口剿涮，完成后再開始當(dāng)次請(qǐng)求。

2.附件上傳

我們這邊上傳附件的流程是這樣的赶站，先進(jìn)行POST請(qǐng)求將我們拼接好的文件名和文件大小給云端幔虏，云端這時(shí)候會(huì)返回我們需要上傳到的url，我們?cè)偻ㄟ^這個(gè)url進(jìn)行PUT上傳贝椿。
（1）POST請(qǐng)求將文件名和長(zhǎng)度給云端：

#pragma mark - NSOperation
-(void)main
{
    [self.lock lock];
    if(!self.file.rawData)
    {
        return;
    }
    NSUInteger size = self.file.rawData.length;
    if (size <= 0)
    {
        //        [self removeOperationFromDB];
        return;
    }
    if(!self.file.key || self.file.key.length < 1)
    {
        return;
    }
    
    NSMutableDictionary *parameterMDic = [[NSMutableDictionary alloc] init];
    [parameterMDic setObject:[NSNumber numberWithInteger:size] forKey:@"size"];
    [parameterMDic setObject:self.file.key forKey:@"filename"];
    [parameterMDic setObject:[appDelegate.userDefaults objectForKey:AccessToken] forKey:AccessToken];
    [[NetworkManager sharedClient] POST:API_ATTACHMENT parameters:parameterMDic success:^
     (AFHTTPRequestOperation *__unused task, id JSON){
         
#ifdef DEBUG_MODE
#endif
         [self completionBlock:API_ATTACHMENT withData:JSON withUserInfo:nil];
         
     }failure:^
     (AFHTTPRequestOperation *__unused task, NSError *error){
         
#ifdef DEBUG_MODE
#endif
         
         [self failedBlock:API_ATTACHMENT withError:error withUserInfo:nil];
     }];
    [self.lock unlock];
}

(2)這里把云端返回?cái)?shù)據(jù)統(tǒng)一判斷想括，未完成就進(jìn)行PUT請(qǐng)求上傳文件，直到完成：

-(void)dealAttachmentResponse:(NSDictionary *)responseDic
{
    [self.lock lock];
    NSString *finishStr = [responseDic objectForKey:@"finished"];
    if ([CommonClass bNull:(NSNull *)finishStr] && finishStr)
    {
        _finishStr = finishStr;
    }
    else
    {
        _finishStr = nil;
    }
    NSNumber *lenNum = [responseDic objectForKey:@"len"];
    NSString *methodStr = [responseDic objectForKey:@"method"];
    if ([CommonClass bNull:(NSNull *)methodStr] && methodStr)
    {
        _methodStr = methodStr;
    }
    else
    {
        _methodStr = nil;
    }
    NSNumber *offNum = [responseDic objectForKey:@"off"];
    NSString *urlStr = [responseDic objectForKey:@"url"];
    if ([CommonClass bNull:(NSNull *)urlStr] && urlStr)
    {
        _urlStr = urlStr;
    }
    else
    {
        _urlStr = nil;
    }
    //    _urlStr = [_urlStr stringByReplacingOccurrencesOfString:@"db.mcloudlife.com" withString:@"115.236.76.184"];
    
    if ([_finishStr isEqualToString:@"Y"] || [lenNum integerValue] <= 0)
    {
        //上傳完成
//        NSString *imgName = [urlStr lastPathComponent];
//        self.uploadOneFileSucceeded(imgName, self.fileIndex, self.file.key);
        self.uploadOneFileSucceeded(_urlStr, self.fileIndex, self.file.key);
        return;
    }
    
    NSRange range = NSMakeRange([offNum integerValue], [lenNum integerValue]);
    NSData * data = [self getUploadImgData:self.file.rawData withRange:range];
    NSInputStream *inputStream = [[NSInputStream alloc] initWithData:data];
    [self httpRequestThroughPut:inputStream];
    
    [self.lock unlock];
}

- (NSData *)getUploadImgData:(NSData *)imgData withRange:(NSRange)range
{
    NSUInteger length =  [imgData length];
    if (length < (range.location + range.length)) {
        return nil;
    }
    NSData *subData = [imgData subdataWithRange:range];
    return subData;
}

(3)PUT請(qǐng)求上傳數(shù)據(jù)烙博，失敗重試瑟蜈，成功則再以上面的方法判斷是否完成。

#pragma mark - NetWork_Upload
-(void)httpRequestThroughPut:(NSInputStream *)inputStream
{
    if (inputStream && _urlStr)
    {
        AFHTTPRequestOperationManager *requestOperationManager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:nil];
        //設(shè)置httpHeader
        [requestOperationManager.requestSerializer setValue:@"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
        [requestOperationManager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
        [requestOperationManager.requestSerializer setValue:[NSString stringWithFormat:@"mCloud %@",[appDelegate.userDefaults objectForKey:AccessToken]] forHTTPHeaderField:@"Authorization"];
        [requestOperationManager.requestSerializer setValue:@"db.mcloudlife.com" forHTTPHeaderField:@"Host"];
        //設(shè)置超時(shí)時(shí)間
        [requestOperationManager.requestSerializer setTimeoutInterval:-1];
        
        //put請(qǐng)求
        AFHTTPRequestOperation *requestOperation = [requestOperationManager PUT:_urlStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
            if (![NetworkErrorDeal getErrorMsgWithResponseData:responseObject])
            {
                if(![responseObject isKindOfClass:[NSDictionary class]])
                {
                    return;
                }
                [self dealResponse:responseObject];
            }
            else
            {
                //嘗試重新請(qǐng)求
                if(_retryCount <= 0)
                {
                    return ;
                }
                _retryCount--;
                dispatch_queue_t  queue= dispatch_queue_create("dealFileAttachmentResponse", NULL);
                dispatch_async(queue, ^{
                    [self httpRequestThroughPut:inputStream];
                });
            }
            
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            
            if(_retryCount <= 0)
            {
                return ;
            }
            _retryCount--;
            dispatch_queue_t  queue= dispatch_queue_create("dealImageAttachmentResponse", NULL);
            dispatch_async(queue, ^{
                [self httpRequestThroughPut:inputStream];
            });
        }];
        
        __block AFHTTPRequestOperation *progressOperation = requestOperation;
        
        [requestOperation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
            
//        }]
        
//        [requestOperation setUploadProgressBlock:^(NSUInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
            
            double percent = totalBytesWritten * 1.0 / self.file.fileSize;
            
            if (self.uploadOneFileProgress) {
                self.uploadOneFileProgress(progressOperation, self.fileIndex, percent);
            }
        }];
        
        //設(shè)置httpbodystream
        [requestOperation setInputStream:inputStream];
    }
}

好了渣窜，這些就是之前的網(wǎng)絡(luò)層铺根，等我給測(cè)試進(jìn)行整體測(cè)試如果沒問題的話，我會(huì)在下一篇記錄主要的修改乔宿。
另外大家如果有關(guān)于升級(jí)AFNetworking3.0的問題的話可以留下評(píng)論位迂，指教不敢當(dāng)，互相討論吧：）