duplicati/Duplicati/WebserverCore/Endpoints/V1/LogData.cs

using Duplicati.Library.RestAPI;
using Duplicati.Server.Database;
using Duplicati.WebserverCore.Abstractions;
using Microsoft.AspNetCore.Mvc;

namespace Duplicati.WebserverCore.Endpoints.V1;

public class LogData : IEndpointV1
{
    public static void Map(RouteGroupBuilder group)
    {
        group.MapGet("/logdata/poll", ([FromServices] Connection connection, [FromQuery] Library.Logging.LogMessageType level, [FromQuery] long id, [FromQuery] long? offset, [FromQuery] int? pagesize)
            => ExecuteLogPoll(level, id, offset ?? 0, pagesize ?? 100))
            .RequireAuthorization();

        group.MapGet("/logdata/log", ([FromServices] Connection connection, [FromQuery] long? offset, [FromQuery] int? pagesize)
            => ExecuteGetLog(connection, offset, pagesize ?? 100))
            .RequireAuthorization();
    }

    private static Dto.LogEntry[] ExecuteLogPoll(Library.Logging.LogMessageType level, long id, long offset, int pagesize)
    {
        pagesize = Math.Max(1, Math.Min(500, pagesize));
        return FIXMEGlobal.LogHandler.AfterID(id, level, pagesize).Select(x => Dto.LogEntry.FromInternalEntry(x)).ToArray();
    }

    private static List<Dictionary<string, object>>? ExecuteGetLog(Connection connection, long? offset, long pagesize)
    {
        List<Dictionary<string, object>>? res = null;
        connection.ExecuteWithCommand(x =>
        {
            res = DumpTable(x, "ErrorLog", "Timestamp", offset, pagesize);
        });

        return res;
    }

    public static List<Dictionary<string, object>> DumpTable(System.Data.IDbCommand cmd, string tablename, string pagingfield, long? offset, long pagesize)
    {
        var result = new List<Dictionary<string, object>>();

        pagesize = Math.Max(10, Math.Min(500, pagesize));

        cmd.CommandText = "SELECT * FROM \"" + tablename + "\"";
        if (!string.IsNullOrEmpty(pagingfield) && offset != null)
        {
            var p = cmd.CreateParameter();
            p.Value = offset.Value;
            cmd.Parameters.Add(p);

            cmd.CommandText += " WHERE \"" + pagingfield + "\" < ?";
        }

        if (!string.IsNullOrEmpty(pagingfield))
            cmd.CommandText += " ORDER BY \"" + pagingfield + "\" DESC";
        cmd.CommandText += " LIMIT " + pagesize.ToString();

        using (var rd = cmd.ExecuteReader())
        {
            var names = new List<string>();
            for (var i = 0; i < rd.FieldCount; i++)
                names.Add(rd.GetName(i));

            while (rd.Read())
            {
                var dict = new Dictionary<string, object>();
                for (int i = 0; i < names.Count; i++)
                    dict[names[i]] = rd.GetValue(i);

                result.Add(dict);
            }
        }

        return result;
    }
}