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

// Copyright (C) 2025, The Duplicati Team
// https://duplicati.com, hello@duplicati.com
// 
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
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// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
// 
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
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using Duplicati.Library.Crashlog;
using Duplicati.Library.Main.Database;
using Duplicati.Server.Database;
using Duplicati.WebserverCore.Abstractions;
using Duplicati.WebserverCore.Dto;
using Microsoft.AspNetCore.Mvc;

namespace Duplicati.WebserverCore.Endpoints.V1;

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

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

        group.MapGet("/logdata/crashlog", ()
            => ExecuteGetCrashLog())
            .RequireAuthorization();
    }

    private static LogEntry[] ExecuteLogPoll(ILogWriteHandler logWriteHandler, Library.Logging.LogMessageType level, long id, int pagesize)
    {
        pagesize = Math.Max(1, Math.Min(500, pagesize));
        return logWriteHandler.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;
    }

    private static CrashLogOutputDto ExecuteGetCrashLog()
        => new CrashLogOutputDto(CrashlogHelper.GetLastCrashLog());

    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)
        {
            cmd.AddNamedParameter("Offset", offset.Value);
            cmd.CommandText += $" WHERE \"{pagingfield}\" < @Offset";
        }

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

        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;
    }
}