public SentimentAnalyser()
{
NameValueCollection configSettings = ConfigurationManager.AppSettings;
_sentimentUrl = configSettings["SENTIMENT_URL"];
_sentimentApi = configSettings["SENTIMENT_API"];
Receive <SocialMediaMaster.MessageToBeAnalysedAndHashtagged>(msg =>
{
string uriString = String.Format("{0}={1}{2}", "text", HttpUtility.UrlEncode(msg.Tweet.Text),
_sentimentApi);
var wc = new WebClient();
wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
wc.Headers[HttpRequestHeader.Accept] = "application/json";
wc.UploadStringTaskAsync(new Uri(_sentimentUrl), uriString.ToString(CultureInfo.InvariantCulture))
.ContinueWith(task =>
{
#region getScoreFromTaskResultJSON
string html = null;
float score = 0;
try
{
var json = JsonConvert.DeserializeObject <dynamic>(task.Result);
if (!float.TryParse(Convert.ToString(json.aggregate.score), out score))
{
score = 0;
}
}
catch (AggregateException)
{
// TODO
;
}
#endregion
#region getTweetDetails
string message = msg.Tweet.Text;
string hashtag = msg.Hashtag;
ITweet tweet = msg.Tweet;
IOEmbedTweet embededtweet = tweet.GenerateOEmbedTweet();
if (embededtweet != null)
{
html = embededtweet.HTML;
}
#endregion
return(new MessageAlreadyAnalysed(message, hashtag, score, html));
}, TaskContinuationOptions.AttachedToParent & TaskContinuationOptions.ExecuteSynchronously)
.PipeTo(Sender);
});
}
public static string ReadHtmlContentFromIOembededTweet(ITweet tweet)
{
string htmlContent = null;
IOEmbedTweet aux = Tweet.GetOEmbedTweet(tweet.Id);
if (aux != null)
{
string htmlCode = aux.HTML;
if (htmlCode != null)
{
TwitterSearcher.htmlDocument.LoadHtml(htmlCode);
htmlContent = TwitterSearcher.htmlDocument.DocumentNode.InnerText;
}
}
return(htmlContent);
}
/// <summary>
/// Starts a Twitter Stream based on the specified geographic coordinates and the now playing hash tag
/// </summary>
/// <param name="latitude1">Latitude of user location (bottom_left)</param>
/// <param name="longitude1">Longitude of user location (bottom_left)</param>
/// <param name="latitude2">Latitude of user location (top_right)</param>
/// <param name="longitude2">Longitude of user location (top_right)</param>
public static async Task StartStream(double latitude1, double longitude1, double latitude2, double longitude2)
{
// Setup Twitter credentials
TweetinviUtilities.SetTwitterCredentials();
// If the stream does not exists...
if (_stream == null)
{
//...then it is started
// Create a filtered stream
_stream = Stream.CreateFilteredStream();
_stream.AddTrack(Constants.NOWPLAYING_HASHTAG); // Lookup for nowplaying hashtag
// OPTIONAL: if you want to see how the feed is updated really quick, just comment the following line of code.
// You will see the effect of "infinite scroll" in the client
_stream.AddLocation(
new Coordinates(latitude1, longitude1),
new Coordinates(latitude2, longitude2)); // Lookup in the specific geographic coordinates
// OPTIONAL: if you want to filter the stream just for a specific user, uncomment the following line of code
//_stream.AddFollow(2834545563);
// Event that handles a matching tweet
_stream.MatchingTweetReceived += async(sender, args) =>
{
// A OEmbed tweet is sent to the client
IOEmbedTweet embedTweet = Tweet.GetOEmbedTweet(args.Tweet);
await _context.Clients.All.updateFeed(embedTweet);
};
// Start the stream matching all conditions
await _stream.StartStreamMatchingAllConditionsAsync();
}
else
{
//... otherwise resume it
_stream.ResumeStream();
}
}
