public void NavigateLandingPage(RssData data)
{
_navigationService.NavigateAsync(nameof(NewLandingPage), new NavigationParameters
{
{ "url", data.Link }
});
}
/// <summary>
/// Reads the RSS feed
/// </summary>
/// <returns>True if read was successful, else False</returns>
public bool ReadRssFeed()
{
try
{
WebRequest request = WebRequest.Create(RssFeedChannel);
WebResponse response = request.GetResponse();
Stream responseStream = response.GetResponseStream();
XmlDocument doc = new XmlDocument();
if (responseStream != null)
{
doc.Load(responseStream);
}
XmlNodeList rssItems = doc.SelectNodes("rss/channel/item");
int count = 0;
if (rssItems != null)
{
foreach (XmlNode item in rssItems)
{
if (RssFeedItemLimit > 0 && count == RssFeedItemLimit)
{
break;
}
Dictionary <string, string> record = new Dictionary <string, string>();
foreach (string field in RssFields)
{
XmlNode node = item.SelectSingleNode(field);
string text = (node != null) ? node.InnerText : "";
if (field == "pubDate")
{
DateTime dt = DateTime.Parse(text);
text = dt.ToLocalTime().ToString("yyyy-MM-dd hh:mm:ss");
}
record[field] = text;
}
RssData.Add(record);
count++;
}
}
if (responseStream != null)
{
responseStream.Close();
}
return(true);
}
catch (Exception)
{
return(false);
}
}
public async Task StartJob()
{
bool existeNoticiaNova = false;
string feed = null;
var existingList = Barrel.Current.Get <List <RssData> >(_key) ?? new List <RssData>();
using (var client = new HttpClient())
{
feed = await client.GetStringAsync("https://medium.com/feed/@bertuzzi");
}
var parser = new RssParser();
var rss = parser.Parse(feed).OrderByDescending(e => e.PublishDate).ToList();;
if (feed != null)
{
foreach (var rssSchema in rss)
{
var isExist = existingList.Any(e => e.Guid == rssSchema.InternalID);
var rssdata = new RssData
{
Title = rssSchema.Title,
PubDate = rssSchema.PublishDate,
Link = rssSchema.FeedUrl,
Guid = rssSchema.InternalID,
Author = rssSchema.Author,
Thumbnail = string.IsNullOrWhiteSpace(rssSchema.ImageUrl) ? $"https://placeimg.com/80/80/nature" : rssSchema.ImageUrl,
Description = rssSchema.Summary
};
if (!isExist)
{
//Se Existiu alguma noticia nova, pelo menos 1 vez
existeNoticiaNova = true;
existingList.Add(rssdata);
}
}
if (existeNoticiaNova)
{
MessagingCenter.Send(existingList, "Update");
}
}
existingList = existingList.OrderByDescending(e => e.PubDate).ToList();
Barrel.Current.Add(_key, existingList, TimeSpan.FromDays(30));
}
public bool GetIsRead(string id)
{
try
{
using (var db = new RssData())
{
var idNumber = Convert.ToInt32(id);
var item = db.ReadHistories.SingleOrDefault(rh => rh.Id == idNumber);
return item != null;
}
}
catch (Exception)
{
return false;
}
}
public void SetRssReadStatus(int id)
{
using (var db = new RssData())
{
var readHistory = db.ReadHistories.SingleOrDefault(rh => rh.Id == id);
if (readHistory == null)
{
db.ReadHistories.Add(new ReadHistory {Id = id, ReadDate = DateTime.Now});
}
else
{
db.ReadHistories.Remove(readHistory);
}
db.SaveChanges();
}
}
public List <RssData> GetEpisodes(int count, int start = 0) //count determines number of episodes to display, start determines where to begin (default 0)
//currently only supports one RSS feed
{
XmlDocument doc = new XmlDocument();
doc.Load(_context.Podcasts.FirstOrDefault().Feed);
XmlElement root = doc.DocumentElement;
XmlNodeList nodes = root.SelectNodes("channel/item");
List <RssData> rssFeedData = new List <RssData>();
for (int i = start; i < count + start; i++)
{
RssData episode = new RssData();
try
{
episode.Title = nodes[i].SelectSingleNode("title").InnerText;
episode.Image = nodes[i].SelectSingleNode("./*[name()='itunes:image']/@href").InnerText;
episode.Link = nodes[i].SelectSingleNode("link").InnerText;
episode.PubDate = nodes[i].SelectSingleNode("pubDate").InnerText.Substring(5, 11);
episode.Audio = nodes[i].SelectSingleNode("enclosure/@url").InnerText;
episode.AudioType = nodes[i].SelectSingleNode("enclosure/@type").InnerText;
try
{
episode.Description = nodes[i].SelectSingleNode("./*[name()='itunes:summary']").InnerText;
}
catch
{
try
{
episode.Description = nodes[i].SelectSingleNode("description").InnerText;
}
catch
{ }
}
rssFeedData.Add(episode);
}
catch { } //no handling yet for any RSS feed entries without all of these attributes - would this ever happen for an actual episode? (as opposed to non-episode posts, which do appear in the feed)
}
return(rssFeedData);
}
public bool VerifyRSS(string url) //verifies that the feed URL is valid by attempting to parse one episode
{
try
{
XmlDocument doc = new XmlDocument();
doc.Load(url);
XmlElement root = doc.DocumentElement;
XmlNodeList nodes = root.SelectNodes("channel/item");
List <RssData> rssFeedData = new List <RssData>();
RssData episode = new RssData();
try
{
episode.Title = nodes[0].SelectSingleNode("title").InnerText;
episode.Image = nodes[0].SelectSingleNode("./*[name()='itunes:image']/@href").InnerText;
episode.Link = nodes[0].SelectSingleNode("link").InnerText;
episode.PubDate = nodes[0].SelectSingleNode("pubDate").InnerText.Substring(5, 11);
episode.Audio = nodes[0].SelectSingleNode("enclosure/@url").InnerText;
episode.AudioType = nodes[0].SelectSingleNode("enclosure/@type").InnerText;
try
{
episode.Description = nodes[0].SelectSingleNode("./*[name()='itunes:summary']").InnerText;
}
catch
{
try
{
episode.Description = nodes[0].SelectSingleNode("description").InnerText;
}
catch { }
}
}
catch { }
}
catch { return(false); }
return(true);
}
//Task OnRetry(Exception e, int retryCount)
//{
// return Task.Factory.StartNew(() =>
// {
// var mensagem = $"Ocorreu um erro ao baixar os dados: {e.Message}, tentando novamente ({retryCount})..";
// _eventAggregator.GetEvent<MessageSentEvent>().Publish(mensagem);
// Console.WriteLine(mensagem);
// });
//}
//public async Task<string> ObterRSSOnRetry()
//{
// var httpClient = new HttpClient();
// var response = await httpClient.GetAsync("https://medium.com/feed/@bertuzzi");
// return await response.Content.ReadAsStringAsync();
//}
public async Task <List <RssData> > ObterRSS()
{
string feed = null;
List <RssData> rssRetorno = new List <RssData>();
int cont = 0;
try
{
using (var client = new HttpClient())
{
await Policy
// .Handle<HttpRequestException>(ex => !ex.Message.ToLower().Contains("404"))
.Handle <HttpRequestException>()
.WaitAndRetryAsync
(
retryCount: 3,
sleepDurationProvider: retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)),
onRetry: (ex, time) =>
{
cont++;
var mensagem = $"Ocorreu um erro ao baixar os dados: {ex.Message}, tentando novamente ({cont})..";
_eventAggregator.GetEvent <MessageSentEvent>().Publish(mensagem);
Console.WriteLine(mensagem);
}
)
.ExecuteAsync(async() =>
{
Console.WriteLine($"Obtendo rss...");
feed = await client.GetStringAsync("https://medium.com/feed/@bertuzzi");
});
}
//var func = new Func<Task<string>>(() => ObterRSSOnRetry());
//feed = await _networkService.Retry<string>(func, 3, OnRetry);
var parser = new RssParser();
var rss = parser.Parse(feed).OrderByDescending(e => e.PublishDate).ToList();
if (feed != null)
{
foreach (var rssSchema in rss)
{
var rssdata = new RssData
{
Title = rssSchema.Title,
PubDate = rssSchema.PublishDate,
Link = rssSchema.FeedUrl,
Guid = rssSchema.InternalID,
Author = rssSchema.Author,
Thumbnail = string.IsNullOrWhiteSpace(rssSchema.ImageUrl) ? $"https://placeimg.com/80/80/nature" : rssSchema.ImageUrl,
Description = rssSchema.Summary
};
rssRetorno.Add(rssdata);
}
}
return(rssRetorno);
}
catch (Exception ex)
{
return(new List <RssData>());
}
}
protected override void Prepare()
{
_context = new RssData(Alias + ".db");
}
public async Task <bool> StartJob()
{
bool existeNoticiaNova = false;
string feed = null;
try
{
var existingList = Barrel.Current.Get <List <RssData> >(_key) ?? new List <RssData>();
using (var client = new HttpClient())
{
var timeoutPolicy = Policy.TimeoutAsync(15);
HttpResponseMessage httpResponse = await timeoutPolicy
.ExecuteAsync(
async ct => await client.GetAsync("https://medium.com/feed/@bertuzzi", ct),
CancellationToken.None
);
feed = await httpResponse.Content.ReadAsStringAsync();
}
var parser = new RssParser();
var rss = parser.Parse(feed).OrderByDescending(e => e.PublishDate).ToList();
if (feed != null)
{
foreach (var rssSchema in rss)
{
var isExist = existingList.Any(e => e.Guid == rssSchema.InternalID);
var rssdata = new RssData
{
Title = rssSchema.Title,
PubDate = rssSchema.PublishDate,
Link = rssSchema.FeedUrl,
Guid = rssSchema.InternalID,
Author = rssSchema.Author,
Thumbnail = string.IsNullOrWhiteSpace(rssSchema.ImageUrl) ? $"https://placeimg.com/80/80/nature" : rssSchema.ImageUrl,
Description = rssSchema.Summary
};
if (!isExist)
{
//Se Existiu alguma noticia nova, pelo menos 1 vez
existeNoticiaNova = true;
existingList.Add(rssdata);
}
}
if (existeNoticiaNova)
{
MessagingCenter.Send(existingList, "Update");
}
}
existingList = existingList.OrderByDescending(e => e.PubDate).ToList();
Barrel.Current.Add(_key, existingList, TimeSpan.FromDays(30));
return(true);
}
catch (Exception ex)
{
return(false);
}
}
