SLRequest and /statuses/filter.json

[valv0]

Hi,

I followed the instructions for integrating SLRequest with the Streaming API, using the following code:

//obtain the account instance for the user's Twitter account
ACAccountStore *store = [[ACAccountStore alloc] init];
ACAccountType *twitterAccountType = [store accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

//Request permission from the user to access the available Twitter accounts
[store requestAccessToAccountsWithType:twitterAccountType options:nil completion:^(BOOL granted, NSError *error) {
   if (!granted) {
      // The user rejected your request
      NSLog(@"User rejected access to the account.");
   }
   else {
   // Grab the available accounts
   NSArray *twitterAccounts = [store accountsWithAccountType:twitterAccountType];
   if ([twitterAccounts count] > 0) {
      ACAccount *account = [twitterAccounts lastObject];
      NSURL* url = [NSURL URLWithString:@"https://stream.twitter.com/1.1/statuses/filter.json"];
      NSDictionary *params = @{@"track":@"Twitter"};
         
      SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeTwitter requestMethod:SLRequestMethodPOST URL:url parameters:params];
      [request setAccount:account];
      [request performRequestWithHandler: ^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
         if (responseData) {
            if (urlResponse.statusCode >= 200 && urlResponse.statusCode < 300) {
               NSError *jsonError;
               NSDictionary *timelineData = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingAllowFragments error:&jsonError];
               if (timelineData) {
                  NSLog(@"Timeline Response: %@\n", timelineData);
               }
               else {
                  // Our JSON deserialization went awry
                  NSLog(@"JSON Error: %@", [jsonError localizedDescription]);
               }
            }
         else {
            // The server did not respond ... were we rate-limited?
            NSLog(@"The response status code is %d",urlResponse.statusCode);
         }
      }
   }];
} // if ([twitterAccounts count] > 0)
} // if (granted) 
}];

However the callbackHandler for the request is never called. What I’m wrong?

[valv0]

I found that streaming api follow a different behaviour. Since the response is not “atomic”, instead the response is progressively populated as new data coming, you should use a different behaviour within your code.

I used the following approach:

1. use the standard SLRequest to populate a request with the correct OAuth
2. use a standard NSURLConnection with delegate to observe new data coming from the streaming endpoint
   

• (void)startStreamingWithKeyword:(NSString *)aKeyword
  {
  //First, we need to obtain the account instance for the user’s Twitter account
  ACAccountStore *store = [[ACAccountStore alloc] init];
  ACAccountType *twitterAccountType = [store accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

  // Request permission from the user to access the available Twitter accounts
  [store requestAccessToAccountsWithType:twitterAccountType
  options:nil
  completion:^(BOOL granted, NSError *error) {
  if (!granted) {
  // The user rejected your request
  NSLog(@“User rejected access to the account.”);
  }
  else {
  // Grab the available accounts
  NSArray *twitterAccounts = [store accountsWithAccountType:twitterAccountType];
  if ([twitterAccounts count] > 0) {
  ACAccount *account = [twitterAccounts lastObject];

                                        NSURL *url = [NSURL URLWithString:@"https://stream.twitter.com/1.1/statuses/filter.json"];
                                        NSDictionary *params = @{@"track" : aKeyword};
                                        
                                        SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeTwitter
                                                                                requestMethod:SLRequestMethodPOST
                                                                                          URL:url
                                                                                   parameters:params];
                                        
                                        [request setAccount:account];
                                        dispatch_async(dispatch_get_main_queue(), ^{
                                            NSURLConnection *aConn = [NSURLConnection connectionWithRequest:[request preparedURLRequest] delegate:self];
                                            [aConn start];
                                        });
                                    } // if ([twitterAccounts count] > 0)
                                } // if (granted) 
                            }];
  

}

• (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
  NSString *dataString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  NSLog(@“dataString: %@”, dataString);
  }