C# Tweetinvi Library - how to stop stream

Question

Attempting to get a filtered stream using the Tweetinvi library via c#.

I am trying to do something similar to the search, which I have been able to successfully receive tweets:

public List<ITweet> SearchTweets(string query)
{
    List<ITweet> tweets = new List<ITweet>();

    TwitterCredentials.ExecuteOperationWithCredentials(Credentials, () =>
    {
        var searchParam = Search.GenerateSearchTweetParameter(query);
        searchParam.Lang = Language.English;
        searchParam.MaximumNumberOfResults = 100;
        tweets = Search.SearchTweets(searchParam);
    });

    return tweets;
}

but the limitation here is that I can only get a max 100 tweets. I want to leverage the stream in a similar way and get a stream of tweets matching the tracks that I pass. I have tried this:

public void FilterStream(string query)
{
    IFilteredStream tweets;

    TwitterCredentials.ExecuteOperationWithCredentials(Credentials, () =>
    {
        var filteredStream = Tweetinvi.Stream.CreateFilteredStream();
        filteredStream.AddTrack(query);
        filteredStream.AddTrack("#" + query);
        filteredStream.MatchingTweetReceived += (sender, args) => { Debug.WriteLine(args.Tweet.Text); };
        filteredStream.StartStreamMatchingAllConditions();
    });
}

but problem is it seems to run in an infinite loop and i'm unsure where to stop or limit the number of tweets I received from the stream to make it stop. The library's documentation is quite unclear and I have been unable to achieve the behavior I am seeking. I'm sure I am on the right route, just unsure how to stop the stream and store all the tweets I've received in a List<ITweet> construct.

Answer 1

To stop the stream use:

filteredStream.StopStream();

You can keep a count of the tweets globally then stop when the number of tweets you need is received.

Answer 2

I had the same problem and ended up doing this:

var task = filteredStream.StartStreamMatchingAllConditionsAsync();

while (true)
{
    Thread.Sleep(500);

    if (task.IsCanceled || task.IsCompleted || task.IsFaulted)
    {
        break;
    }

    if (ShouldStop)
    {
         filteredStream.StopStream();
         break;
    }
}

task.Wait();

StartStreamMatchingAllConditionsAsync() will start the task and return immediately, then the endless while loop will check for a condition to stop the stream and break the loop.

ShouldStop is a static boolean variable that is flipped to True when the code should stop streaming from twitter.

Then we Wait() for the stream task to finish.

That code smells but it seems to work! I'd be curious to see if someone comes up with a better implementation...

Answer 3

I know it's an old question, but I've just done this:

    public void Start()
    {
        _stream = Stream.CreateFilteredStream(_creds);

        // Do whatever stream setup you want to do

        Task.Factory.StartNew(() => {
            Debug.WriteLine("Thread started");
            _stream.StartStreamMatchingAllConditions();
            Debug.WriteLine("Thread stopped");
            });
    }

    public void Stop()
    {
        _stream.StopStream();
    }

Answer 4

• You should try to put a condition inside the MatchingTweetReceived method like this :

  public void FilterStream(string query)
  

  { IFilteredStream tweets;

  TwitterCredentials.ExecuteOperationWithCredentials(Credentials, () =>
  {
      var filteredStream = Tweetinvi.Stream.CreateFilteredStream();
      filteredStream.AddTrack(query);
      filteredStream.AddTrack("#" + query);
      filteredStream.MatchingTweetReceived += (sender, args) => { 
  
            Debug.WriteLine(args.Tweet.Text); 
            if (condition)
              stream.StopStream();
  

  }; filteredStream.StartStreamMatchingAllConditions(); }); }

This worked fine for me.