235 lines
7.6 KiB
C#
235 lines
7.6 KiB
C#
// SparkleShare, a collaboration and sharing tool.
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// Copyright (C) 2010 Hylke Bons <hylkebons@gmail.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System;
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using System.Collections.Generic;
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using System.Timers;
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namespace SparkleLib {
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public class SparkleAnnouncement {
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public readonly string FolderIdentifier;
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public readonly string Message;
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public SparkleAnnouncement (string folder_identifier, string message)
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{
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FolderIdentifier = folder_identifier;
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Message = message;
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}
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}
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public static class SparkleListenerFactory {
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private static List<SparkleListenerBase> listeners = new List<SparkleListenerBase> ();
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public static SparkleListenerBase CreateListener (string folder_name, string folder_identifier)
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{
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string uri = SparkleConfig.DefaultConfig.GetFolderOptionalAttribute (
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folder_name, "announcements_url");
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string key = SparkleConfig.DefaultConfig.GetFolderOptionalAttribute (
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folder_name, "key");
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if (uri == null) {
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// This is SparkleShare's centralized notification service.
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// Don't worry, we only use this server as a backup if you
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// don't have your own. All data needed to connect is hashed and
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// we don't store any personal information ever
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uri = "irc://204.62.14.135/";
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}
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if (key == null) {
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key = "12345";
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}
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Uri announce_uri = new Uri (uri);
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// We use only one listener per server to keep
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// the number of connections as low as possible
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foreach (SparkleListenerBase listener in listeners) {
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if (listener.Server.Equals (announce_uri)) {
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SparkleHelpers.DebugInfo ("ListenerFactory",
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"Refered to existing listener for " + announce_uri);
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listener.AlsoListenTo (folder_identifier);
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return (SparkleListenerBase) listener;
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}
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}
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// Create a new listener with the appropriate
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// type if one doesn't exist yet for that server
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switch (announce_uri.Scheme) {
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case "tcp":
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listeners.Add (new SparkleListenerTcp (announce_uri, folder_identifier));
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break;
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case "irc":
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listeners.Add (new SparkleListenerIrc (announce_uri, folder_identifier, key));
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break;
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default:
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listeners.Add (new SparkleListenerIrc (announce_uri, folder_identifier, key));
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break;
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}
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SparkleHelpers.DebugInfo ("ListenerFactory", "Issued new listener for " + announce_uri);
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return (SparkleListenerBase) listeners [listeners.Count - 1];
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}
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}
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// A persistent connection to the server that
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// listens for change notifications
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public abstract class SparkleListenerBase {
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// We've connected to the server
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public event ConnectedEventHandler Connected;
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public delegate void ConnectedEventHandler ();
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// We've disconnected from the server
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public event DisconnectedEventHandler Disconnected;
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public delegate void DisconnectedEventHandler ();
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// We've been notified about a remote
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// change by the channel
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public event AnnouncementEventHandler Announcement;
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public delegate void AnnouncementEventHandler (SparkleAnnouncement announcement);
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public abstract void Connect ();
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public abstract void Announce (SparkleAnnouncement announcent);
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public abstract void AlsoListenTo (string folder_identifier);
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public abstract bool IsConnected { get; }
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protected List<string> channels = new List<string> ();
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protected List<SparkleAnnouncement> queue_up = new List<SparkleAnnouncement> ();
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protected List<SparkleAnnouncement> queue_down = new List<SparkleAnnouncement> ();
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protected bool is_connecting;
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protected Uri server;
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protected Timer reconnect_timer = new Timer { Interval = 60 * 1000, Enabled = true };
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public SparkleListenerBase (Uri server, string folder_identifier)
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{
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this.server = server;
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this.reconnect_timer.Elapsed += delegate {
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if (!IsConnected && !this.is_connecting)
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Reconnect ();
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};
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this.reconnect_timer.Start ();
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}
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public void AnnounceBase (SparkleAnnouncement announcement)
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{
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if (IsConnected) {
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SparkleHelpers.DebugInfo ("Listener",
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"Announcing to " + announcement.FolderIdentifier + " on " + this.server);
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Announce (announcement);
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} else {
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SparkleHelpers.DebugInfo ("Listener", "Not connected to " + this.server + ". Queuing message");
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this.queue_up.Add (announcement);
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}
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}
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public bool HasQueueDownAnnouncement (string folder_identifier)
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{
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foreach (SparkleAnnouncement announcement in this.queue_down) {
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if (announcement.FolderIdentifier.Equals (folder_identifier)) {
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this.queue_down.Remove (announcement);
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return true;
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}
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}
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return false;
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}
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public void Reconnect ()
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{
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SparkleHelpers.DebugInfo ("Listener", "Trying to reconnect to " + this.server);
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Connect ();
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}
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public void OnConnected ()
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{
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SparkleHelpers.DebugInfo ("Listener", "Connected to " + Server);
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if (Connected != null)
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Connected ();
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if (this.queue_up.Count > 0) {
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SparkleHelpers.DebugInfo ("Listener", "Delivering queued messages...");
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foreach (SparkleAnnouncement announcement in this.queue_up) {
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AnnounceBase (announcement);
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this.queue_up.Remove (announcement);
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}
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}
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}
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public void OnDisconnected ()
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{
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SparkleHelpers.DebugInfo ("Listener", "Disonnected from " + Server);
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if (Disconnected != null)
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Disconnected ();
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}
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public void OnAnnouncement (SparkleAnnouncement announcement)
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{
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SparkleHelpers.DebugInfo ("Listener", "Got message from " + announcement.FolderIdentifier + " on " + this.server);
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this.queue_down.Add (announcement);
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if (Announcement != null)
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Announcement (announcement);
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}
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public virtual void Dispose ()
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{
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this.reconnect_timer.Dispose ();
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}
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public Uri Server {
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get {
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return this.server;
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}
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}
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public bool IsConnecting {
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get {
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return this.is_connecting;
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}
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}
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}
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}
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