700 lines
24 KiB
C#
700 lines
24 KiB
C#
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// ----------------------------------------------------------------------------
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// <copyright file="RegionHandler.cs" company="Exit Games GmbH">
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// Loadbalancing Framework for Photon - Copyright (C) 2018 Exit Games GmbH
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// </copyright>
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// <summary>
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// The RegionHandler class provides methods to ping a list of regions,
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// to find the one with best ping.
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// </summary>
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// <author>developer@photonengine.com</author>
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// ----------------------------------------------------------------------------
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#if UNITY_4_7 || UNITY_5 || UNITY_5_3_OR_NEWER
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#define SUPPORTED_UNITY
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#endif
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#if UNITY_WEBGL
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#define PING_VIA_COROUTINE
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#endif
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namespace Photon.Realtime
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{
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using System;
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using System.Text;
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using System.Threading;
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using System.Net;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics;
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using ExitGames.Client.Photon;
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#if SUPPORTED_UNITY
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using UnityEngine;
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using Debug = UnityEngine.Debug;
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#endif
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#if SUPPORTED_UNITY || NETFX_CORE
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using Hashtable = ExitGames.Client.Photon.Hashtable;
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using SupportClass = ExitGames.Client.Photon.SupportClass;
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#endif
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/// <summary>
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/// Provides methods to work with Photon's regions (Photon Cloud) and can be use to find the one with best ping.
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/// </summary>
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/// <remarks>
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/// When a client uses a Name Server to fetch the list of available regions, the LoadBalancingClient will create a RegionHandler
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/// and provide it via the OnRegionListReceived callback.
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///
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/// Your logic can decide to either connect to one of those regional servers, or it may use PingMinimumOfRegions to test
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/// which region provides the best ping.
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///
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/// It makes sense to make clients "sticky" to a region when one gets selected.
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/// This can be achieved by storing the SummaryToCache value, once pinging was done.
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/// When the client connects again, the previous SummaryToCache helps limiting the number of regions to ping.
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/// In best case, only the previously selected region gets re-pinged and if the current ping is not much worse, this one region is used again.
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/// </remarks>
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public class RegionHandler
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{
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/// <summary>The implementation of PhotonPing to use for region pinging (Best Region detection).</summary>
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/// <remarks>Defaults to null, which means the Type is set automatically.</remarks>
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public static Type PingImplementation;
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/// <summary>A list of region names for the Photon Cloud. Set by the result of OpGetRegions().</summary>
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/// <remarks>
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/// Implement ILoadBalancingCallbacks and register for the callbacks to get OnRegionListReceived(RegionHandler regionHandler).
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/// You can also put a "case OperationCode.GetRegions:" into your OnOperationResponse method to notice when the result is available.
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/// </remarks>
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public List<Region> EnabledRegions { get; protected internal set; }
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private string availableRegionCodes;
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private Region bestRegionCache;
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/// <summary>
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/// When PingMinimumOfRegions was called and completed, the BestRegion is identified by best ping.
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/// </summary>
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public Region BestRegion
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{
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get
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{
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if (this.EnabledRegions == null)
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{
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return null;
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}
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if (this.bestRegionCache != null)
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{
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return this.bestRegionCache;
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}
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this.EnabledRegions.Sort((a, b) => a.Ping.CompareTo(b.Ping) );
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this.bestRegionCache = this.EnabledRegions[0];
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return this.bestRegionCache;
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}
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}
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/// <summary>
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/// This value summarizes the results of pinging currently available regions (after PingMinimumOfRegions finished).
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/// </summary>
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/// <remarks>
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/// This value should be stored in the client by the game logic.
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/// When connecting again, use it as previous summary to speed up pinging regions and to make the best region sticky for the client.
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/// </remarks>
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public string SummaryToCache
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{
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get
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{
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if (this.BestRegion != null) {
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return this.BestRegion.Code + ";" + this.BestRegion.Ping + ";" + this.availableRegionCodes;
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}
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return this.availableRegionCodes;
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}
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}
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public string GetResults()
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{
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StringBuilder sb = new StringBuilder();
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sb.AppendFormat("Region Pinging Result: {0}\n", this.BestRegion.ToString());
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foreach (RegionPinger region in this.pingerList)
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{
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sb.AppendFormat(region.GetResults() + "\n");
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}
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sb.AppendFormat("Previous summary: {0}", this.previousSummaryProvided);
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return sb.ToString();
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}
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public void SetRegions(OperationResponse opGetRegions)
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{
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if (opGetRegions.OperationCode != OperationCode.GetRegions)
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{
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return;
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}
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if (opGetRegions.ReturnCode != ErrorCode.Ok)
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{
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return;
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}
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string[] regions = opGetRegions[ParameterCode.Region] as string[];
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string[] servers = opGetRegions[ParameterCode.Address] as string[];
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if (regions == null || servers == null || regions.Length != servers.Length)
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{
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//TODO: log error
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//Debug.LogError("The region arrays from Name Server are not ok. Must be non-null and same length. " + (regions == null) + " " + (servers == null) + "\n" + opGetRegions.ToStringFull());
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return;
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}
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this.bestRegionCache = null;
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this.EnabledRegions = new List<Region>(regions.Length);
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for (int i = 0; i < regions.Length; i++)
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{
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string server = servers[i];
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if (PortToPingOverride != 0)
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{
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server = LoadBalancingClient.ReplacePortWithAlternative(servers[i], PortToPingOverride);
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}
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Region tmp = new Region(regions[i], server);
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if (string.IsNullOrEmpty(tmp.Code))
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{
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continue;
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}
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this.EnabledRegions.Add(tmp);
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}
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Array.Sort(regions);
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this.availableRegionCodes = string.Join(",", regions);
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}
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private List<RegionPinger> pingerList = new List<RegionPinger>();
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private Action<RegionHandler> onCompleteCall;
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private int previousPing;
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public bool IsPinging { get; private set; }
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private string previousSummaryProvided;
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protected internal static ushort PortToPingOverride;
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public RegionHandler(ushort masterServerPortOverride = 0)
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{
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PortToPingOverride = masterServerPortOverride;
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}
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public bool PingMinimumOfRegions(Action<RegionHandler> onCompleteCallback, string previousSummary)
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{
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if (this.EnabledRegions == null || this.EnabledRegions.Count == 0)
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{
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//TODO: log error
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//Debug.LogError("No regions available. Maybe all got filtered out or the AppId is not correctly configured.");
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return false;
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}
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if (this.IsPinging)
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{
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//TODO: log warning
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//Debug.LogWarning("PingMinimumOfRegions() skipped, because this RegionHandler is already pinging some regions.");
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return false;
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}
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this.IsPinging = true;
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this.onCompleteCall = onCompleteCallback;
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this.previousSummaryProvided = previousSummary;
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if (string.IsNullOrEmpty(previousSummary))
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{
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return this.PingEnabledRegions();
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}
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string[] values = previousSummary.Split(';');
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if (values.Length < 3)
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{
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return this.PingEnabledRegions();
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}
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int prevBestRegionPing;
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bool secondValueIsInt = Int32.TryParse(values[1], out prevBestRegionPing);
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if (!secondValueIsInt)
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{
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return this.PingEnabledRegions();
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}
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string prevBestRegionCode = values[0];
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string prevAvailableRegionCodes = values[2];
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if (string.IsNullOrEmpty(prevBestRegionCode))
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{
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return this.PingEnabledRegions();
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}
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if (string.IsNullOrEmpty(prevAvailableRegionCodes))
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{
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return this.PingEnabledRegions();
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}
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if (!this.availableRegionCodes.Equals(prevAvailableRegionCodes) || !this.availableRegionCodes.Contains(prevBestRegionCode))
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{
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return this.PingEnabledRegions();
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}
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if (prevBestRegionPing >= RegionPinger.PingWhenFailed)
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{
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return this.PingEnabledRegions();
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}
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// let's check only the preferred region to detect if it's still "good enough"
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this.previousPing = prevBestRegionPing;
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Region preferred = this.EnabledRegions.Find(r => r.Code.Equals(prevBestRegionCode));
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RegionPinger singlePinger = new RegionPinger(preferred, this.OnPreferredRegionPinged);
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lock (this.pingerList)
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{
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this.pingerList.Add(singlePinger);
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}
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singlePinger.Start();
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return true;
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}
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private void OnPreferredRegionPinged(Region preferredRegion)
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{
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if (preferredRegion.Ping > this.previousPing * 1.50f)
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{
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this.PingEnabledRegions();
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}
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else
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{
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this.IsPinging = false;
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this.onCompleteCall(this);
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#if PING_VIA_COROUTINE
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MonoBehaviourEmpty.SelfDestroy();
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#endif
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}
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}
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private bool PingEnabledRegions()
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{
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if (this.EnabledRegions == null || this.EnabledRegions.Count == 0)
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{
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//TODO: log
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//Debug.LogError("No regions available. Maybe all got filtered out or the AppId is not correctly configured.");
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return false;
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}
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lock (this.pingerList)
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{
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this.pingerList.Clear();
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foreach (Region region in this.EnabledRegions)
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{
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RegionPinger rp = new RegionPinger(region, this.OnRegionDone);
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this.pingerList.Add(rp);
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rp.Start(); // TODO: check return value
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}
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}
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return true;
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}
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private void OnRegionDone(Region region)
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{
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lock (this.pingerList)
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{
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if (this.IsPinging == false)
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{
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return;
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}
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this.bestRegionCache = null;
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foreach (RegionPinger pinger in this.pingerList)
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{
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if (!pinger.Done)
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{
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return;
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}
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}
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this.IsPinging = false;
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}
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this.onCompleteCall(this);
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#if PING_VIA_COROUTINE
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MonoBehaviourEmpty.SelfDestroy();
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#endif
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}
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}
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public class RegionPinger
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{
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public static int Attempts = 5;
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public static bool IgnoreInitialAttempt = true;
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public static int MaxMilliseconsPerPing = 800; // enter a value you're sure some server can beat (have a lower rtt)
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public static int PingWhenFailed = Attempts * MaxMilliseconsPerPing;
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private Region region;
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private string regionAddress;
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public int CurrentAttempt = 0;
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public bool Done { get; private set; }
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private Action<Region> onDoneCall;
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private PhotonPing ping;
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private List<int> rttResults;
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public RegionPinger(Region region, Action<Region> onDoneCallback)
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{
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this.region = region;
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this.region.Ping = PingWhenFailed;
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this.Done = false;
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this.onDoneCall = onDoneCallback;
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}
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/// <summary>Selects the best fitting ping implementation or uses the one set in RegionHandler.PingImplementation.</summary>
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/// <returns>PhotonPing instance to use.</returns>
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private PhotonPing GetPingImplementation()
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{
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PhotonPing ping = null;
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// using each type explicitly in the conditional code, makes sure Unity doesn't strip the class / constructor.
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#if !UNITY_EDITOR && NETFX_CORE
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if (RegionHandler.PingImplementation == null || RegionHandler.PingImplementation == typeof(PingWindowsStore))
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{
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ping = new PingWindowsStore();
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}
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#elif NATIVE_SOCKETS || NO_SOCKET
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if (RegionHandler.PingImplementation == null || RegionHandler.PingImplementation == typeof(PingNativeDynamic))
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{
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ping = new PingNativeDynamic();
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}
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#elif UNITY_WEBGL
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if (RegionHandler.PingImplementation == null || RegionHandler.PingImplementation == typeof(PingHttp))
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{
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ping = new PingHttp();
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}
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#else
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if (RegionHandler.PingImplementation == null || RegionHandler.PingImplementation == typeof(PingMono))
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{
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ping = new PingMono();
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}
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#endif
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if (ping == null)
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{
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if (RegionHandler.PingImplementation != null)
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{
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ping = (PhotonPing)Activator.CreateInstance(RegionHandler.PingImplementation);
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}
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}
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return ping;
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||
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|
}
|
||
|
|
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Starts the ping routine for the assigned region.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>
|
||
|
|
/// Pinging runs in a ThreadPool worker item or (if needed) in a Thread.
|
||
|
|
/// WebGL runs pinging on the Main Thread as coroutine.
|
||
|
|
/// </remarks>
|
||
|
|
/// <returns>Always true.</returns>
|
||
|
|
public bool Start()
|
||
|
|
{
|
||
|
|
// all addresses for Photon region servers will contain a :port ending. this needs to be removed first.
|
||
|
|
// PhotonPing.StartPing() requires a plain (IP) address without port or protocol-prefix (on all but Windows 8.1 and WebGL platforms).
|
||
|
|
string address = this.region.HostAndPort;
|
||
|
|
int indexOfColon = address.LastIndexOf(':');
|
||
|
|
if (indexOfColon > 1)
|
||
|
|
{
|
||
|
|
address = address.Substring(0, indexOfColon);
|
||
|
|
}
|
||
|
|
this.regionAddress = ResolveHost(address);
|
||
|
|
|
||
|
|
|
||
|
|
this.ping = this.GetPingImplementation();
|
||
|
|
|
||
|
|
|
||
|
|
this.Done = false;
|
||
|
|
this.CurrentAttempt = 0;
|
||
|
|
this.rttResults = new List<int>(Attempts);
|
||
|
|
|
||
|
|
|
||
|
|
#if PING_VIA_COROUTINE
|
||
|
|
MonoBehaviourEmpty.Instance.StartCoroutine(this.RegionPingCoroutine());
|
||
|
|
#else
|
||
|
|
bool queued = false;
|
||
|
|
#if !NETFX_CORE
|
||
|
|
try
|
||
|
|
{
|
||
|
|
queued = ThreadPool.QueueUserWorkItem(this.RegionPingPooled);
|
||
|
|
}
|
||
|
|
catch
|
||
|
|
{
|
||
|
|
queued = false;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
if (!queued)
|
||
|
|
{
|
||
|
|
SupportClass.StartBackgroundCalls(this.RegionPingThreaded, 0, "RegionPing_" + this.region.Code + "_" + this.region.Cluster);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// wraps RegionPingThreaded() to get the signature compatible with ThreadPool.QueueUserWorkItem
|
||
|
|
protected internal void RegionPingPooled(object context)
|
||
|
|
{
|
||
|
|
this.RegionPingThreaded();
|
||
|
|
}
|
||
|
|
|
||
|
|
protected internal bool RegionPingThreaded()
|
||
|
|
{
|
||
|
|
this.region.Ping = PingWhenFailed;
|
||
|
|
|
||
|
|
float rttSum = 0.0f;
|
||
|
|
int replyCount = 0;
|
||
|
|
|
||
|
|
|
||
|
|
Stopwatch sw = new Stopwatch();
|
||
|
|
for (this.CurrentAttempt = 0; this.CurrentAttempt < Attempts; this.CurrentAttempt++)
|
||
|
|
{
|
||
|
|
bool overtime = false;
|
||
|
|
sw.Reset();
|
||
|
|
sw.Start();
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
this.ping.StartPing(this.regionAddress);
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
System.Diagnostics.Debug.WriteLine("RegionPinger.RegionPingThreaded() catched an exception for ping.StartPing(). Exception: " + e + " Source: " + e.Source + " Message: " + e.Message);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
while (!this.ping.Done())
|
||
|
|
{
|
||
|
|
if (sw.ElapsedMilliseconds >= MaxMilliseconsPerPing)
|
||
|
|
{
|
||
|
|
overtime = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
#if !NETFX_CORE
|
||
|
|
System.Threading.Thread.Sleep(0);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
sw.Stop();
|
||
|
|
int rtt = (int)sw.ElapsedMilliseconds;
|
||
|
|
this.rttResults.Add(rtt);
|
||
|
|
|
||
|
|
if (IgnoreInitialAttempt && this.CurrentAttempt == 0)
|
||
|
|
{
|
||
|
|
// do nothing.
|
||
|
|
}
|
||
|
|
else if (this.ping.Successful && !overtime)
|
||
|
|
{
|
||
|
|
rttSum += rtt;
|
||
|
|
replyCount++;
|
||
|
|
this.region.Ping = (int)((rttSum) / replyCount);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if !NETFX_CORE
|
||
|
|
System.Threading.Thread.Sleep(10);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
//Debug.Log("Done: "+ this.region.Code);
|
||
|
|
this.Done = true;
|
||
|
|
this.ping.Dispose();
|
||
|
|
|
||
|
|
this.onDoneCall(this.region);
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#if SUPPORTED_UNITY
|
||
|
|
/// <remarks>
|
||
|
|
/// Affected by frame-rate of app, as this Coroutine checks the socket for a result once per frame.
|
||
|
|
/// </remarks>
|
||
|
|
protected internal IEnumerator RegionPingCoroutine()
|
||
|
|
{
|
||
|
|
this.region.Ping = PingWhenFailed;
|
||
|
|
|
||
|
|
float rttSum = 0.0f;
|
||
|
|
int replyCount = 0;
|
||
|
|
|
||
|
|
|
||
|
|
Stopwatch sw = new Stopwatch();
|
||
|
|
for (this.CurrentAttempt = 0; this.CurrentAttempt < Attempts; this.CurrentAttempt++)
|
||
|
|
{
|
||
|
|
bool overtime = false;
|
||
|
|
sw.Reset();
|
||
|
|
sw.Start();
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
this.ping.StartPing(this.regionAddress);
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
Debug.Log("catched: " + e);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
while (!this.ping.Done())
|
||
|
|
{
|
||
|
|
if (sw.ElapsedMilliseconds >= MaxMilliseconsPerPing)
|
||
|
|
{
|
||
|
|
overtime = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
yield return 0; // keep this loop tight, to avoid adding local lag to rtt.
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
sw.Stop();
|
||
|
|
int rtt = (int)sw.ElapsedMilliseconds;
|
||
|
|
this.rttResults.Add(rtt);
|
||
|
|
|
||
|
|
|
||
|
|
if (IgnoreInitialAttempt && this.CurrentAttempt == 0)
|
||
|
|
{
|
||
|
|
// do nothing.
|
||
|
|
}
|
||
|
|
else if (this.ping.Successful && !overtime)
|
||
|
|
{
|
||
|
|
rttSum += rtt;
|
||
|
|
replyCount++;
|
||
|
|
this.region.Ping = (int)((rttSum) / replyCount);
|
||
|
|
}
|
||
|
|
|
||
|
|
yield return new WaitForSeconds(0.1f);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//Debug.Log("Done: "+ this.region.Code);
|
||
|
|
this.Done = true;
|
||
|
|
this.ping.Dispose();
|
||
|
|
this.onDoneCall(this.region);
|
||
|
|
yield return null;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
public string GetResults()
|
||
|
|
{
|
||
|
|
return string.Format("{0}: {1} ({2})", this.region.Code, this.region.Ping, this.rttResults.ToStringFull());
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Attempts to resolve a hostname into an IP string or returns empty string if that fails.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>
|
||
|
|
/// To be compatible with most platforms, the address family is checked like this:<br/>
|
||
|
|
/// if (ipAddress.AddressFamily.ToString().Contains("6")) // ipv6...
|
||
|
|
/// </remarks>
|
||
|
|
/// <param name="hostName">Hostname to resolve.</param>
|
||
|
|
/// <returns>IP string or empty string if resolution fails</returns>
|
||
|
|
public static string ResolveHost(string hostName)
|
||
|
|
{
|
||
|
|
|
||
|
|
if (hostName.StartsWith("wss://"))
|
||
|
|
{
|
||
|
|
hostName = hostName.Substring(6);
|
||
|
|
}
|
||
|
|
if (hostName.StartsWith("ws://"))
|
||
|
|
{
|
||
|
|
hostName = hostName.Substring(5);
|
||
|
|
}
|
||
|
|
|
||
|
|
string ipv4Address = string.Empty;
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
#if UNITY_WSA || NETFX_CORE || UNITY_WEBGL
|
||
|
|
return hostName;
|
||
|
|
#else
|
||
|
|
|
||
|
|
IPAddress[] address = Dns.GetHostAddresses(hostName);
|
||
|
|
if (address.Length == 1)
|
||
|
|
{
|
||
|
|
return address[0].ToString();
|
||
|
|
}
|
||
|
|
|
||
|
|
// if we got more addresses, try to pick a IPv6 one
|
||
|
|
// checking ipAddress.ToString() means we don't have to import System.Net.Sockets, which is not available on some platforms (Metro)
|
||
|
|
for (int index = 0; index < address.Length; index++)
|
||
|
|
{
|
||
|
|
IPAddress ipAddress = address[index];
|
||
|
|
if (ipAddress != null)
|
||
|
|
{
|
||
|
|
if (ipAddress.ToString().Contains(":"))
|
||
|
|
{
|
||
|
|
return ipAddress.ToString();
|
||
|
|
}
|
||
|
|
if (string.IsNullOrEmpty(ipv4Address))
|
||
|
|
{
|
||
|
|
ipv4Address = address.ToString();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
catch (System.Exception e)
|
||
|
|
{
|
||
|
|
System.Diagnostics.Debug.WriteLine("RegionPinger.ResolveHost() catched an exception for Dns.GetHostAddresses(). Exception: " + e + " Source: " + e.Source + " Message: " + e.Message);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ipv4Address;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#if PING_VIA_COROUTINE
|
||
|
|
internal class MonoBehaviourEmpty : MonoBehaviour
|
||
|
|
{
|
||
|
|
private static bool instanceSet; // to avoid instance null check which may be incorrect
|
||
|
|
private static MonoBehaviourEmpty instance;
|
||
|
|
|
||
|
|
public static MonoBehaviourEmpty Instance
|
||
|
|
{
|
||
|
|
get
|
||
|
|
{
|
||
|
|
if (instanceSet)
|
||
|
|
{
|
||
|
|
return instance;
|
||
|
|
}
|
||
|
|
GameObject go = new GameObject();
|
||
|
|
DontDestroyOnLoad(go);
|
||
|
|
go.name = "RegionPinger";
|
||
|
|
instance = go.AddComponent<MonoBehaviourEmpty>();
|
||
|
|
instanceSet = true;
|
||
|
|
return instance;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public static void SelfDestroy()
|
||
|
|
{
|
||
|
|
if (instanceSet)
|
||
|
|
{
|
||
|
|
instanceSet = false;
|
||
|
|
Destroy(instance.gameObject);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|