source: binary-improvements/MapRendering/API/GetLog.cs@ 454

using System.Collections.Generic;
using AllocsFixes.JSON;
using Webserver;
using Webserver.WebAPI;

namespace AllocsFixes.WebAPIs {
        public class GetLog : AbsWebAPI {
                private const int MAX_COUNT = 1000;
                
                public override void HandleRequest (RequestContext _context) {
                        if (_context.Request.QueryString ["count"] == null || !int.TryParse (_context.Request.QueryString ["count"], out var count)) {
                                count = 50;
                        }

                        if (count == 0) {
                                count = 1;
                        }

                        if (count > MAX_COUNT) {
                                count = MAX_COUNT;
                        }

                        if (count < -MAX_COUNT) {
                                count = -MAX_COUNT;
                        }

                        if (_context.Request.QueryString ["firstLine"] == null || !int.TryParse (_context.Request.QueryString ["firstLine"], out var firstLine)) {
                                if (count > 0) {
                                        firstLine = LogBuffer.Instance.OldestLine;
                                } else {
                                        firstLine = LogBuffer.Instance.LatestLine;
                                }
                        }

                        JSONObject result = new JSONObject ();

                        List<LogBuffer.LogEntry> logEntries = LogBuffer.Instance.GetRange (ref firstLine, count, out var lastLine);

                        JSONArray entries = new JSONArray ();
                        foreach (LogBuffer.LogEntry logEntry in logEntries) {
                                JSONObject entry = new JSONObject ();
                                var logEntryTimestamp = logEntry.Timestamp;
                                entry.Add ("date", new JSONString ($"{logEntryTimestamp.Year:0000}-{logEntryTimestamp.Month:00}-{logEntryTimestamp.Day:00}"));
                                entry.Add ("time", new JSONString ($"{logEntryTimestamp.Hour:00}:{logEntryTimestamp.Minute:00}:{logEntryTimestamp.Second:00}"));
                                entry.Add ("uptime", new JSONString (logEntry.Uptime.ToString()));
                                entry.Add ("msg", new JSONString (logEntry.Message));
                                entry.Add ("trace", new JSONString (logEntry.Trace));
                                entry.Add ("type", new JSONString (logEntry.Type.ToStringCached ()));
                                entries.Add (entry);
                        }

                        result.Add ("firstLine", new JSONNumber (firstLine));
                        result.Add ("lastLine", new JSONNumber (lastLine));
                        result.Add ("entries", entries);

                        LegacyApiHelper.WriteJSON (_context.Response, result);
                }
        }
}