about summary refs log tree commit diff
path: root/LibMatrix/Helpers/SyncHelper.cs
blob: a63b8bbec773d43d3140b05ff7ff74556460554d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
using System.Diagnostics;
using ArcaneLibs.Extensions;
using LibMatrix.Filters;
using LibMatrix.Homeservers;
using LibMatrix.Responses;
using Microsoft.Extensions.Logging;

namespace LibMatrix.Helpers;

public class SyncHelper(AuthenticatedHomeserverGeneric homeserver, ILogger? logger = null) {
    public string? Since { get; set; }
    public int Timeout { get; set; } = 30000;
    public string? SetPresence { get; set; } = "online";
    public SyncFilter? Filter { get; set; }
    public bool FullState { get; set; } = false;

    public bool IsInitialSync { get; set; } = true;

    public async Task<SyncResponse?> SyncAsync(CancellationToken? cancellationToken = null) {
        if (homeserver is null) {
            Console.WriteLine("Null passed as homeserver for SyncHelper!");
            throw new ArgumentNullException("Null passed as homeserver for SyncHelper!");
        }

        var url = $"/_matrix/client/v3/sync?timeout={Timeout}&set_presence={SetPresence}&full_state={(FullState ? "true" : "false")}";
        if (!string.IsNullOrWhiteSpace(Since)) url += $"&since={Since}";
        if (Filter is not null) url += $"&filter={Filter.ToJson(ignoreNull: true, indent: false)}";
        // Console.WriteLine("Calling: " + url);
        logger?.LogInformation("SyncHelper: Calling: {}", url);
        try {
            return await homeserver?.ClientHttpClient?.GetFromJsonAsync<SyncResponse>(url, cancellationToken: cancellationToken ?? CancellationToken.None)!;
        }
        catch (TaskCanceledException) {
            Console.WriteLine("Sync cancelled!");
            logger?.LogWarning("Sync cancelled due to TaskCanceledException!");
        }
        catch (Exception e) {
            Console.WriteLine(e);
            logger?.LogError(e, "Failed to sync!\n{}", e.ToString());
        }

        return null;
    }

    public async IAsyncEnumerable<SyncResponse> EnumerateSyncAsync(CancellationToken? cancellationToken = null) {
        while (!cancellationToken?.IsCancellationRequested ?? true) {
            var sync = await SyncAsync(cancellationToken);
            if (sync is null) continue;
            if (!string.IsNullOrWhiteSpace(sync?.NextBatch)) Since = sync.NextBatch;
            yield return sync;
        }
    }

    public async Task RunSyncLoopAsync(bool skipInitialSyncEvents = true, CancellationToken? cancellationToken = null) {
        var sw = Stopwatch.StartNew();
        int emptyInitialSyncCount = 0;
        var oldTimeout = Timeout;
        Timeout = 0;
        await foreach (var sync in EnumerateSyncAsync(cancellationToken)) {
            logger?.LogInformation("Got sync response: {} bytes, {} elapsed", sync?.ToJson(ignoreNull: true, indent: false).Length ?? -1, sw.Elapsed);
            if (sync?.ToJson(ignoreNull: true, indent: false).Length < 250) {
                emptyInitialSyncCount++;
                if (emptyInitialSyncCount > 5) {
                    IsInitialSync = false;
                    Timeout = oldTimeout;
                }
            }

            await RunSyncLoopCallbacksAsync(sync, IsInitialSync && skipInitialSyncEvents);
        }
    }

    private async Task RunSyncLoopCallbacksAsync(SyncResponse syncResponse, bool isInitialSync) {
        var tasks = SyncReceivedHandlers.Select(x => x(syncResponse)).ToList();
        await Task.WhenAll(tasks);

        if (syncResponse.AccountData is { Events.Count: > 0 }) {
            foreach (var accountDataEvent in syncResponse.AccountData.Events) {
                tasks = AccountDataReceivedHandlers.Select(x => x(accountDataEvent)).ToList();
                await Task.WhenAll(tasks);
            }
        }

        await RunSyncLoopRoomCallbacksAsync(syncResponse, isInitialSync);
    }

    private async Task RunSyncLoopRoomCallbacksAsync(SyncResponse syncResponse, bool isInitialSync) {
        if (syncResponse.Rooms is { Invite.Count: > 0 }) {
            foreach (var roomInvite in syncResponse.Rooms.Invite) {
                var tasks = InviteReceivedHandlers.Select(x => x(roomInvite)).ToList();
                await Task.WhenAll(tasks);
            }
        }

        if (isInitialSync) return;

        if (syncResponse.Rooms is { Join.Count: > 0 }) {
            foreach (var updatedRoom in syncResponse.Rooms.Join) {
                if (updatedRoom.Value.Timeline is null) continue;
                foreach (var stateEventResponse in updatedRoom.Value.Timeline.Events) {
                    stateEventResponse.RoomId = updatedRoom.Key;
                    var tasks = TimelineEventHandlers.Select(x => x(stateEventResponse)).ToList();
                    await Task.WhenAll(tasks);
                }
            }
        }
    }

    /// <summary>
    /// Event fired when a sync response is received
    /// </summary>
    public List<Func<SyncResponse, Task>> SyncReceivedHandlers { get; } = new();

    /// <summary>
    /// Event fired when a room invite is received
    /// </summary>
    public List<Func<KeyValuePair<string, SyncResponse.RoomsDataStructure.InvitedRoomDataStructure>, Task>> InviteReceivedHandlers { get; } = new();

    /// <summary>
    /// Event fired when a timeline event is received
    /// </summary>
    public List<Func<StateEventResponse, Task>> TimelineEventHandlers { get; } = new();

    /// <summary>
    /// Event fired when an account data event is received
    /// </summary>
    public List<Func<StateEventResponse, Task>> AccountDataReceivedHandlers { get; } = new();
}