public async Task Start()
{
await Task.Run(async() =>
{
var url = $"https://www.reddit.com/r/{_subredditName}/new.json";
var existingPosts = await _reddit.GetPosts(url);
_knownPostIds = existingPosts.Select(p => p.Id);
Observable
.Interval(_interval)
.Subscribe(
async x =>
{
try
{
var newPosts = await _reddit.GetPosts(url);
foreach (var post in newPosts.Where(p => !_knownPostIds.Contains(p.Id)))
{
_posts.OnNext(post);
}
_knownPostIds = newPosts.Select(p => p.Id);
}
catch (Exception ex)
{
_onError(ex);
}
});
});
}
private async Task GetAllPosts(string baseUrl)
{
var url = baseUrl;
var count = 0;
IEnumerable <RedditPostData> posts = null;
do
{
try
{
posts = await _reddit.GetPosts(url);
if (posts.Any())
{
foreach (var post in posts.Where(p => p.CreatedUtc.FromUnixTime() >= _minimumDate))
{
_posts.OnNext(post);
}
count += 25;
var lastPost = posts?.Last();
url = $"{baseUrl}&count={count}&after={lastPost?.Name}";
_stop = posts == null || posts.Any(p => p.CreatedUtc.FromUnixTime() < _minimumDate);
}
else
{
_stop = true;
}
}
catch (Exception ex)
{
_logError(ex, "Error retrieving posts");
}
}while (!_stop && posts != null && posts.Any());
}