public UserHistorySnapshot Query(string username, bool forceReevaluation = false)
{
var entry = dbClient.GetKeyValueEntry(KVSTORE_USER_HISTORY_ENTRY_TYPE, username);
UserHistorySnapshot existingRecord = null;
if (entry.ExistedInDatabase &&
TryParseUserHistorySnapshot(entry.Value, out existingRecord) &&
!forceReevaluation &&
(DateTime.Now - entry.UpdatedAt) < TimeSpan.FromDays(1))
{
log.WriteLine("Using cached user history: " + username);
return(existingRecord);
}
log.WriteLine("Fetching latest user history: " + username);
var snapshot = existingRecord ?? new UserHistorySnapshot();
var commentStats = UpdateUserRecordCommentsInternal(username, snapshot);
var postStats = UpdateUserRecordPostsInternal(username, snapshot);
dbClient.PutKeyValueEntry(KVSTORE_USER_HISTORY_ENTRY_TYPE, username, JsonUtils.ToJson(snapshot));
log.WriteLine($"Done. {snapshot.Comments.Count}c/{snapshot.Posts.Count}p, {commentStats.added}c/{postStats.added}p Added, {commentStats.updated}c/{postStats.updated}p Updated.");
return(snapshot);
}
private (int added, int updated) UpdateUserRecordPostsInternal(string username, UserHistorySnapshot record)
{
var(added, updated, nextPosts) = UpdateUserRecordContributionsInternal <PostSnapshot, Post>(
username,
record.Posts,
p => {
var(content, postType) =
p is LinkPost lp ? (lp.URL, PostType.Link) :
p is SelfPost sp ? (sp.SelfText, PostType.Self) :
throw new NotSupportedException("Unknown post type: " + p.GetType().FullName);
return(new PostSnapshot {
FullName = p.Fullname,
Subreddit = p.Subreddit,
Score = p.Score,
Title = p.Title,
Content = content,
PostType = postType,
CreationTime = p.Created,
Removed = p.Removed,
});
},
private (int added, int updated) UpdateUserRecordCommentsInternal(string username, UserHistorySnapshot record)
{
var(added, updated, nextComments) = UpdateUserRecordContributionsInternal <CommentSnapshot, Comment>(
username,
record.Comments,
c => new CommentSnapshot {
FullName = c.Fullname,
Subreddit = c.Subreddit,
Score = c.Score,
Text = c.Body,
CreationTime = c.Created,
Removed = c.Removed,
},
() => redditClient.EnumerateUserCommentsBatchedTimeDescendingLimit1000ish(username),
c => c.Created,
c => c.Fullname,
c => c.Subreddit,
"comment");
record.Comments = nextComments;
return(added, updated);
}