CLre/CLre_server/WebStatus/LogEndpoints.cs

using System.IO;
using System.Net;
using System.Reflection;
using System.Text;
using HarmonyLib;

namespace CLre_server.WebStatus
{
    public class LogEndpoints
    {
        [WebEndpoint("/l/current")]
        private static void FullLog(HttpListenerContext ctx)
        {
            if (CustomLogger_GetFileNameToUse_Patch.currentLogFile == null)
            {
                byte[] output = Encoding.UTF8.GetBytes("No log file available");
                ctx.Response.OutputStream.Write(output, 0, output.Length);
                return;
            }
            // copy file because log is already open for writing
            string copyFilename = CustomLogger_GetFileNameToUse_Patch.currentLogFile + ".copy";
            File.Copy(CustomLogger_GetFileNameToUse_Patch.currentLogFile, copyFilename, true);
            FileStream logFile = new FileStream(copyFilename, FileMode.Open, FileAccess.Read, FileShare.Read);
            logFile.CopyTo(ctx.Response.OutputStream);
            logFile.Close();
        }
    }

    [HarmonyPatch]
    class CustomLogger_GetFileNameToUse_Patch
    {
        internal static string currentLogFile = null;

        [HarmonyPostfix]
        public static void AfterMethodCall(string __result)
        {
#if DEBUG
            API.Utility.Logging.MetaLog($"Current logfile is {__result}");
#endif
            currentLogFile = __result;
        }
        
        [HarmonyTargetMethod]
        public static MethodBase Target()
        {
            return AccessTools.Method("CustomLogger:GetFileNameToUse");
        }
    }
}