9569a1dea8
* I'm not a big fan of this code to be perfectly honest. It probably can be fixed better. There's possibly an error on the simulator side, or in this code, that I haven't managed to locate, when the EventQueue has an early return rather than long-polling as it should, and it's triggered by this code. Not sure if the official viewer suffers the same fault (possibly.)
402 lines
17 KiB
C#
402 lines
17 KiB
C#
/*
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* Copyright (c) 2006-2016, openmetaverse.co
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* Copyright (c) 2022-2024, Sjofn LLC.
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* All rights reserved.
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*
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* - Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Neither the name of the openmetaverse.co nor the names
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* of its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections;
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using System.IO;
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using System.Net;
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using System.Net.Http;
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using System.Threading;
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using System.Threading.Tasks;
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using OpenMetaverse.StructuredData;
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namespace OpenMetaverse.Http
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{
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public class EventQueueClient
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{
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/// <summary>For exponential backoff on error.</summary>
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private const int REQUEST_BACKOFF_SECONDS = 15 * 1000; // 15 seconds start
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private const int REQUEST_BACKOFF_SECONDS_INC = 5 * 1000; // 5 seconds increase
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private const int REQUEST_BACKOFF_SECONDS_MAX = 5 * 60 * 1000; // 5 minutes
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public delegate void ConnectedCallback();
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public delegate void EventCallback(string eventName, OSDMap body);
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public ConnectedCallback OnConnected;
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public EventCallback OnEvent;
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public bool Running { get; private set; }
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protected readonly Uri Address;
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protected readonly Simulator Simulator;
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protected string LastError = "Undefined";
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private CancellationTokenSource _httpCts;
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protected bool Dead;
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/// <summary>Number of times we've received an unknown CAPS exception in series.</summary>
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private int _errorCount;
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public EventQueueClient(Uri eventQueueLocation, Simulator sim)
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{
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Address = eventQueueLocation;
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Simulator = sim;
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_httpCts = new CancellationTokenSource();
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}
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public void RestartIfDead()
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{
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if (Dead)
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{
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Start();
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}
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}
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public void Start()
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{
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Dead = false;
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Running = true;
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// Create an EventQueueGet request
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OSDMap payload = new OSDMap { ["ack"] = new OSD(), ["done"] = OSD.FromBoolean(false) };
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_httpCts = new CancellationTokenSource();
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Task req = Simulator.Client.HttpCapsClient.PostRequestAsync(Address, OSDFormat.Xml, payload,
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_httpCts.Token,
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RequestCompletedHandler, null,
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ConnectedResponseHandler);
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}
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public void Stop(bool immediate)
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{
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Dead = true;
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if (immediate)
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{
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Running = false;
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}
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_httpCts.Cancel();
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}
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void ConnectedResponseHandler(HttpResponseMessage response)
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{
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if (!response.IsSuccessStatusCode)
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{
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return;
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}
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Running = true;
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// The event queue is starting up for the first time
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if (OnConnected != null)
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{
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try
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{
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OnConnected();
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}
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catch (Exception ex)
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{
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Logger.Log(ex.Message, Helpers.LogLevel.Error, ex);
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}
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}
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}
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void RequestCompletedHandler(HttpResponseMessage response, byte[] responseData, Exception error)
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{
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// Ignore anything if we're no longer connected to the sim.
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if (!Simulator.Connected) { return; }
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try
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{
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OSDArray events = null;
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var ack = 0;
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if (responseData != null)
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{
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_errorCount = 0;
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// Got a response
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if (OSDParser.DeserializeLLSDXml(responseData) is OSDMap result)
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{
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events = result["events"] as OSDArray;
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ack = result["id"].AsInteger();
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}
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else
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{
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var responseString = System.Text.Encoding.UTF8.GetString(responseData);
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if (responseString.Contains("502 Proxy Error"))
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{
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// LL's "go ask again" message.
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}
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else if (responseString.Contains("<llsd><undef /></llsd>"))
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{
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Running = false;
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Dead = true;
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LastError = responseString;
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}
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else
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{
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Logger.Log($"Got an unparseable response (1) from {Simulator} event queue: \"" +
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responseString + "\"", Helpers.LogLevel.Warning);
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}
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}
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}
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else if (error != null)
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{
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#region Error handling
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if (response == null) // This happens during a timeout (i.e. normal eventqueue operation.)
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{
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if (error is IOException || error is HttpRequestException)
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{
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// Ignore.
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}
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else
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{
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Logger.Log($"Got an unparseable response (2) from {Simulator} event queue: \"{error}\"", Helpers.LogLevel.Error);
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}
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}
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else switch (response.StatusCode)
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{
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case HttpStatusCode.NotFound:
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case HttpStatusCode.Gone:
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Logger.Log($"Closing event queue at {Simulator} due to missing caps URI",
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Helpers.LogLevel.Info);
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Running = false;
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Dead = true;
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LastError = "Missing Caps URI";
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break;
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case (HttpStatusCode)499: // weird error returned occasionally, ignore for now
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// I believe this is the timeout error invented by LL for LSL HTTP-out requests (gwyneth 20220413)
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Logger.Log($"Possible HTTP-out timeout error from {Simulator}, no need to continue",
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Helpers.LogLevel.Debug);
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Running = false;
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Dead = true;
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LastError = "HTTP Timeout";
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break;
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case HttpStatusCode.InternalServerError:
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if (error != null)
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{
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var responseString = (responseData == null) ? string.Empty : System.Text.Encoding.UTF8.GetString(responseData);
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if (responseData == null || responseData.Length == 0)
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{
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try
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{
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responseString = response.Content.ReadAsStringAsync().Result;
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}
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catch (Exception) { /* no-op */ }
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}
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if (!responseString.Contains("502 Proxy Error"))
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{
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Logger.Log($"Grid sent a {response.StatusCode} : {response.ReasonPhrase} at {Simulator}", Helpers.LogLevel.Debug, Simulator.Client);
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if (!string.IsNullOrEmpty(responseString))
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{
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Logger.Log("Full response was: " + responseString, Helpers.LogLevel.Debug, Simulator.Client);
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}
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if (error.InnerException != null)
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{
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if (!error.InnerException.Message.Contains("502 Proxy Error"))
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{
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Running = false;
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Dead = true;
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LastError = error.ToString();
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}
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}
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else
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{
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const bool WILLFULLY_IGNORE_LL_SPECS_ON_EVENT_QUEUE = true;
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if (!WILLFULLY_IGNORE_LL_SPECS_ON_EVENT_QUEUE || !Simulator.Connected)
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{
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Running = false;
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Dead = true;
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LastError = error.ToString();
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}
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}
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}
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else
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{
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// It's the typical re-queue for event queue get
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}
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}
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else
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{
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Logger.Log($"Grid sent a {response.StatusCode} at {Simulator}", Helpers.LogLevel.Debug);
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}
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break;
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case HttpStatusCode.BadGateway:
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// This is not good (server) protocol design, but it's normal.
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// The EventQueue server is a proxy that connects to a Squid
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// cache which will time out periodically. The EventQueue server
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// interprets this as a generic error and returns a 502 to us
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// that we ignore
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//
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// Note: if this condition persists, it _might_ be the grid trying to request
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// that the client closes the connection, as per LL's specs (gwyneth 20220414)
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Logger.Log($"Grid sent a Bad Gateway Error at {Simulator}; " +
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$"probably a time-out from the grid's EventQueue server (normal) -- ignoring and continuing",
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Helpers.LogLevel.Debug);
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break;
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default:
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++_errorCount;
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// Try to log a meaningful error message
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if (response.StatusCode != HttpStatusCode.OK)
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{
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Logger.Log($"Unrecognized caps connection problem from {Simulator}: {response.StatusCode} {response.ReasonPhrase}",
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Helpers.LogLevel.Warning);
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}
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else if (error.InnerException != null)
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{
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// see comment above (gwyneth 20220414)
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Logger.Log($"Unrecognized internal caps exception from {Simulator}: '{error.InnerException.Message}'",
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Helpers.LogLevel.Warning);
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Logger.Log($"Message ---\n{error.Message}", Helpers.LogLevel.Warning);
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if (error.Data.Count > 0)
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{
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Logger.Log(" Extra details:", Helpers.LogLevel.Warning);
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foreach (DictionaryEntry de in error.Data)
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{
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Logger.Log(string.Format(" Key: {0,-20} Value: {1}",
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"'" + de.Key + "'", de.Value),
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Helpers.LogLevel.Warning);
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}
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}
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}
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else
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{
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Logger.Log($"Unrecognized caps exception from {Simulator}: {error.Message}",
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Helpers.LogLevel.Warning);
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}
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break;
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} // end switch
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#endregion Error handling
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}
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else
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{
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++_errorCount;
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Logger.Log($"No response from {Simulator} event queue but no reported error either",
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Helpers.LogLevel.Warning);
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}
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#pragma warning disable CS0164 // This label has not been referenced
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HandlingDone:
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#region Resume the connection
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if (Running)
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{
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OSDMap payload = new OSDMap();
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if (ack != 0)
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{
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payload["ack"] = OSD.FromInteger(ack);
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}
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else
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{
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payload["ack"] = new OSD();
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}
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bool simShutdown = Simulator.Connected;
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payload["done"] = OSD.FromBoolean(!simShutdown /*_Dead*/);
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if (_errorCount > 0)
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{
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// Exponentially back off, so we don't hammer the CPU
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Thread.Sleep(Math.Min(REQUEST_BACKOFF_SECONDS + _errorCount * REQUEST_BACKOFF_SECONDS_INC,
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REQUEST_BACKOFF_SECONDS_MAX));
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}
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// Resume the connection.
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Task req = Simulator.Client.HttpCapsClient.PostRequestAsync(Address, OSDFormat.Xml, payload,
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_httpCts.Token,
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RequestCompletedHandler);
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// If the event queue is dead at this point, turn it off since
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// that was the last thing we want to do
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if (Dead)
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{
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Running = false;
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Logger.DebugLog($"Sent event queue shutdown message for {Simulator}");
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}
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}
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else
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{
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//if (Dead && Simulator.Connected && false)
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//{
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// Thread.Sleep(5000);
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// if (Dead && Simulator.Connected)
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// {
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// RestartIfDead();
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// }
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//}
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}
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#endregion Resume the connection
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#region Handle incoming events
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if (OnEvent == null || events == null || events.Count <= 0) return;
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// Fire callbacks for each event received
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foreach (var osd in events)
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{
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var evt = (OSDMap)osd;
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string msg = evt["message"].AsString();
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OSDMap body = (OSDMap)evt["body"];
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try
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{
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OnEvent(msg, body);
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}
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catch (Exception ex)
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{
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Logger.Log(ex.Message, Helpers.LogLevel.Error, ex);
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}
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}
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#endregion Handle incoming events
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}
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catch (Exception e)
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{
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Logger.Log($"Exception in EventQueueGet handler; {e.Message}", Helpers.LogLevel.Error, e);
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}
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}
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}
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}
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