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@implementation BootStrap

- (void) init {
    if (self = [super init]) {
      @weakify(self);
      RAC(self, result) = [[[[self.textfield.rac_textSignal
                              ignore:@""]
                            distinctUntilChanged]
                          map:^RACStream *(NSString *text) {
                              @strongify(self);
                              return [[[self jsonRequest:text]
                                      delay:0.4f]
                                      logAll];
                          }]
                          switchToLatest];
}


- (RACSignal *) jsonRequest: (NSString *)parameter {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        NSOperation *operation = [[AFHTTPRequestOperationManager manager] GET:@"http://int.dpool.sina.com.cn/iplookup/iplookup.php"
                                                                   parameters:@{@"ip": parameter, @"format": @"json"}
                                                                      success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                                                          NSString *next = [NSString stringWithFormat:@"%@, %@", parameter, responseObject];
                                                                          [subscriber sendNext:next];
                                                                          [subscriber sendCompleted];
                                                                      }
                                                                      failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                                                          [subscriber sendError:error];
                                                                      }];
        return [RACDisposable disposableWithBlock:^{
            [operation cancel];
        }];
    }];
}