insight/src/Server/Insight.Server/Network/Agent/Handlers/SessionHandler.cs

using Insight.Domain.Interfaces;
using Insight.Domain.Network;
using Insight.Domain.Network.Agent.Messages;
using Insight.Infrastructure.Entities;
using MongoDB.Bson;
using MongoDB.Driver;

namespace Insight.Server.Network.Agent.Handlers;

public class SessionHandler : IMessageHandler<AgentSession>
{
    private readonly IMongoDatabase _database;

    public SessionHandler(IMongoDatabase database)
    {
        _database = database;
    }

    public async ValueTask HandleAsync<TMessage>(AgentSession sender, TMessage message, CancellationToken cancellationToken) where TMessage : IMessage
    {
        switch (message)
        {
            case Collection<Session> sessions:
                await OnSessionsAsync(sender, sessions, cancellationToken);
                break;
        }
    }

    private async ValueTask OnSessionsAsync(AgentSession session, List<Session> sessions, CancellationToken cancellationToken)
    {
        var agentEntity = await _database.Agent().Find(Builders<AgentEntity>.Filter.Eq(p => p.Id, session.Id)).FirstOrDefaultAsync(cancellationToken);
        if (agentEntity is null) return;

        var hostEntity = await _database.Host().Find(Builders<HostEntity>.Filter.Eq(p => p.Agent, agentEntity.Id)).FirstOrDefaultAsync(cancellationToken);
        if (hostEntity is null) return;

        var batch = ObjectId.GenerateNewId().ToString();
        var date = DateTime.Now;

        var bulk = new List<WriteModel<HostSessionEntity>>();

        if (sessions is not null && sessions.Any())
        {
            foreach (var sess in sessions)
            {
                var filterDefinition = Builders<HostSessionEntity>.Filter.And(new List<FilterDefinition<HostSessionEntity>>
                    {
                        Builders<HostSessionEntity>.Filter.Eq(x => x.Host, hostEntity.Id),
                        Builders<HostSessionEntity>.Filter.Eq(x => x.Sid, sess.Sid)
                    });

                var updateDefinition = Builders<HostSessionEntity>.Update
                    .SetOnInsert(p => p.Insert, date)
                    .SetOnInsert(p => p.Host, hostEntity.Id)
                    .SetOnInsert(p => p.Sid, sess.Sid)
                    .Set(p => p.Update, date)
                    .Set(p => p.Batch, batch)
                    .Set(p => p.User, sess.User)
                    .Set(p => p.Remote, sess.Remote)
                    .Set(p => p.Type, sess.Type)
                    .Set(p => p.State, sess.Status);

                bulk.Add(new UpdateOneModel<HostSessionEntity>(filterDefinition, updateDefinition)
                {
                    IsUpsert = true
                });
            }
        }

        bulk.Add(new DeleteManyModel<HostSessionEntity>(Builders<HostSessionEntity>.Filter.And(new List<FilterDefinition<HostSessionEntity>>
                {
                    Builders<HostSessionEntity>.Filter.Eq(x => x.Host, hostEntity.Id),
                    Builders<HostSessionEntity>.Filter.Ne(x => x.Batch, batch)
                })));

        var result = await _database.HostSession().BulkWriteAsync(bulk, cancellationToken: cancellationToken);
    }
}