public async Task <Listing> LinksForSubreddit(Subreddits subreddits, string subredditName, string after)
{
var subredditId = await TranslateSubredditNameToId(subreddits, subredditName);
var keyspace = new byte[8];
for (int i = 0; i < 8 && i < subredditId.Length; i++)
{
keyspace[i] = (byte)subredditId[i];
}
var linkCursor = await _linksDB.SelectAsync(_linksDB.GetKeys().First(), keyspace);
if (after != null && linkCursor != null)
{
var afterKeyspace = new byte[16];
for (int i = 0; i < 16 && i < after.Length + 10; i++)
{
afterKeyspace[i] = (byte)after[i + 2]; //skip ahead past the after type identifier
}
await linkCursor.SeekAsync(_linksDB.GetKeys().First(), afterKeyspace);
}
return(await DeserializeCursor(linkCursor, 25));
}
private async Task <string> TranslateSubredditNameToId(Subreddits subreddits, string subredditName)
{
var subreddit = await subreddits.GetSubreddit(null, subredditName);
if (subreddit != null)
{
return(((Subreddit)subreddit.Data).Name);
}
else
{
return(null);
}
}
public async Task<Listing> LinksForSubreddit(Subreddits subreddits, string subredditName, string after)
{
try
{
var subredditId = await TranslateSubredditNameToId(subreddits, subredditName);
if (subredditId == null)
return new Listing { Data = new ListingData { Children = new List<Thing>() } };
var keyspace = new byte[8];
for (int i = 0; i < 8 && i < subredditId.Length; i++)
keyspace[i] = (byte)subredditId[i];
using (var linkCursor = await _linksDB.SelectAsync(_linksDB.GetKeys().First(), keyspace))
{
if (after != null && linkCursor != null)
{
var afterKeyspace = new byte[16];
for (int i = 0; i < 16 && i < after.Length + 10; i++)
afterKeyspace[i] = (byte)after[i + 2]; //skip ahead past the after type identifier
await linkCursor.SeekAsync(_linksDB.GetKeys().First(), afterKeyspace, DBReadFlags.NoLock);
}
return await DeserializeCursor(linkCursor, 25);
}
}
catch (Exception ex)
{
var errorCode = DBError.TranslateError((uint)ex.HResult);
Debug.WriteLine(errorCode);
return new Listing { Data = new ListingData { Children = new List<Thing>() } };
}
}
private async Task<string> TranslateSubredditNameToId(Subreddits subreddits, string subredditName)
{
var subreddit = await subreddits.GetSubreddit(null, subredditName);
if (subreddit != null)
return ((Subreddit)subreddit.Data).Name;
else
return null;
}
