protected abstract void ProcessUpdatedMessage(ChatboxMessage message, bool isPartOfInitialSalvo = false, bool isEdited = false, bool isBanned = false);
/// <summary>
/// Fetches new messages from the chatbox.
/// </summary>
/// <param name="retry">Level of desperation fetching the new messages.</param>
protected void FetchNewMessages(int retry = 0)
{
string messagesResponse;
try
{
messagesResponse = WebGetPage(MessagesUrl);
}
catch (WebException ex)
{
Logger.WarnFormat("fetching new messages failed, retry {0}\n{1}", retry, ex);
// try harder
Retry(retry, () => FetchNewMessages(retry + 1));
return;
}
var messages = new HtmlDocument();
messages.LoadHtml(messagesResponse);
if (messages.DocumentNode == null)
{
// dang
Retry(retry, () => FetchNewMessages(retry + 1));
return;
}
var allTrs = messages.DocumentNode.SelectNodesOrEmpty("/tr");
if (allTrs.Count == 0)
{
// aw crap
Retry(retry, () => FetchNewMessages(retry + 1));
return;
}
var newLastMessage = _lastMessageReceived;
var visibleMessageIDs = new HashSet <long>();
var newAndEditedMessages = new Stack <MessageToDistribute>();
// for each message
foreach (var tr in allTrs)
{
// pick out the TDs
var tds = tr.SelectNodesOrEmpty("./td");
if (tds.Count != 2)
{
continue;
}
// pick out the first (metadata)
var metaTd = tds[0];
var bodyTd = tds[1];
// find the link to the message and to the user
var messageID = FishOutID(metaTd, MessageIDPiece);
var userID = FishOutID(metaTd, UserIDPiece);
if (!messageID.HasValue || !userID.HasValue)
{
// bah, humbug
continue;
}
if (newLastMessage < messageID.Value)
{
newLastMessage = messageID.Value;
}
visibleMessageIDs.Add(messageID.Value);
// fetch the timestamp
var timestamp = DateTime.Now;
var timestampMatch = TimestampPattern.Match(metaTd.InnerHtml);
if (timestampMatch.Success)
{
var timeString = timestampMatch.Groups[1].Value;
DateTime parsed;
if (DateTime.TryParseExact(
timeString,
"dd-MM-yy, HH:mm",
CultureInfo.InvariantCulture,
ForumConfig.UtcTime ? DateTimeStyles.AssumeUniversal : DateTimeStyles.AssumeLocal,
out parsed
))
{
timestamp = parsed;
}
}
// get the nickname
HtmlNode nickElement = null;
foreach (var linkElement in metaTd.SelectNodesOrEmpty(".//a[@href]"))
{
if (linkElement.GetAttributeValue("href", null).Contains(UserIDPiece))
{
nickElement = linkElement;
}
}
if (nickElement == null)
{
// bah, humbug
continue;
}
var nick = nickElement.InnerText;
var isBanned = ForumConfig.LowercaseBannedUsers.Contains(nick.ToLowerInvariant());
// cache the nickname
_lowercaseUsernamesToUserIDNamePairs[nick.ToLowerInvariant()] = new UserIDAndNickname(userID.Value, nick);
var message = new ChatboxMessage(
messageID.Value,
userID.Value,
nickElement,
bodyTd,
timestamp,
Decompiler
);
var body = bodyTd.InnerHtml;
if (_oldMessageIDsToBodies.ContainsKey(messageID.Value))
{
var oldBody = _oldMessageIDsToBodies[messageID.Value];
if (oldBody != body)
{
_oldMessageIDsToBodies[messageID.Value] = body;
newAndEditedMessages.Push(new MessageToDistribute(_initialSalvo, true, isBanned, message));
}
}
else
{
_oldMessageIDsToBodies[messageID.Value] = body;
newAndEditedMessages.Push(new MessageToDistribute(_initialSalvo, false, isBanned, message));
}
}
// port the bodies of messages that are still visible
var messageIDsToBodies = new Dictionary <long, string>();
foreach (var pair in _oldMessageIDsToBodies)
{
if (visibleMessageIDs.Contains(pair.Key))
{
messageIDsToBodies[pair.Key] = pair.Value;
}
}
_oldMessageIDsToBodies = messageIDsToBodies;
// distribute the news and modifications
while (newAndEditedMessages.Count > 0)
{
var msg = newAndEditedMessages.Pop();
OnMessageUpdated(new MessageUpdatedEventArgs {
Message = msg
});
}
_initialSalvo = false;
_lastMessageReceived = newLastMessage;
}
