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| 1 | +using Newtonsoft.Json; |
| 2 | +using System; |
| 3 | +using System.Threading; |
| 4 | +using System.Threading.Tasks; |
| 5 | + |
| 6 | +namespace PubnubApi.PubnubEventEngine |
| 7 | +{ |
| 8 | + public class ReceiveReconnectRequestEventArgs : EventArgs |
| 9 | + { |
| 10 | + public ExtendedState ExtendedState { get; set; } |
| 11 | + public Action<string> ReceiveReconnectResponseCallback { get; set; } |
| 12 | + } |
| 13 | + public class CancelReceiveReconnectRequestEventArgs : EventArgs |
| 14 | + { |
| 15 | + } |
| 16 | + public class ReceiveReconnectingEffectHandler<T> : IEffectInvocationHandler |
| 17 | + { |
| 18 | + EventEmitter eventEmitter; |
| 19 | + private ExtendedState extendedState { get; set;} |
| 20 | + public Action<string> LogCallback { get; set; } |
| 21 | + public Action<PNStatus> AnnounceStatus { get; set; } |
| 22 | + public PNReconnectionPolicy ReconnectionPolicy { get; set; } |
| 23 | + public int MaxRetries { get; set; } |
| 24 | + private Message<object>[] receiveMessages { get; set; } |
| 25 | + private PNStatus pnStatus { get; set; } |
| 26 | + private int timerInterval; |
| 27 | + const int MINEXPONENTIALBACKOFF = 1; |
| 28 | + const int MAXEXPONENTIALBACKOFF = 25; |
| 29 | + const int INTERVAL = 3; |
| 30 | + |
| 31 | + public event EventHandler<ReceiveReconnectRequestEventArgs> ReceiveReconnectRequested; |
| 32 | + public event EventHandler<CancelReceiveReconnectRequestEventArgs> CancelReceiveReconnectRequested; |
| 33 | + System.Threading.Timer timer; |
| 34 | + protected virtual void OnReceiveReconnectRequested(ReceiveReconnectRequestEventArgs e) |
| 35 | + { |
| 36 | + EventHandler<ReceiveReconnectRequestEventArgs> handler = ReceiveReconnectRequested; |
| 37 | + if (handler != null) |
| 38 | + { |
| 39 | + handler(this, e); |
| 40 | + } |
| 41 | + } |
| 42 | + protected virtual void OnCancelReceiveReconnectRequested(CancelReceiveReconnectRequestEventArgs e) |
| 43 | + { |
| 44 | + EventHandler<CancelReceiveReconnectRequestEventArgs> handler = CancelReceiveReconnectRequested; |
| 45 | + if (handler != null) |
| 46 | + { |
| 47 | + handler(this, e); |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + CancellationTokenSource cancellationTokenSource; |
| 52 | + public ReceiveReconnectingEffectHandler(EventEmitter emitter) |
| 53 | + { |
| 54 | + this.eventEmitter = emitter; |
| 55 | + cancellationTokenSource = new CancellationTokenSource(); |
| 56 | + } |
| 57 | + |
| 58 | + public async void Start(ExtendedState context, EventType eventType) |
| 59 | + { |
| 60 | + extendedState = context; |
| 61 | + await Task.Factory.StartNew(() => { }); |
| 62 | + if (cancellationTokenSource != null && cancellationTokenSource.Token.CanBeCanceled) { |
| 63 | + Cancel(); |
| 64 | + } |
| 65 | + |
| 66 | + if (ReconnectionPolicy == PNReconnectionPolicy.EXPONENTIAL) |
| 67 | + { |
| 68 | + double numberForMath = extendedState.Attempts % 6; |
| 69 | + timerInterval = (int)(Math.Pow(2, numberForMath) - 1); |
| 70 | + if (timerInterval > MAXEXPONENTIALBACKOFF) |
| 71 | + { |
| 72 | + timerInterval = MINEXPONENTIALBACKOFF; |
| 73 | + } |
| 74 | + else if (timerInterval < 1) |
| 75 | + { |
| 76 | + timerInterval = MINEXPONENTIALBACKOFF; |
| 77 | + } |
| 78 | + } |
| 79 | + else if (ReconnectionPolicy == PNReconnectionPolicy.LINEAR) |
| 80 | + { |
| 81 | + timerInterval = INTERVAL; |
| 82 | + } |
| 83 | + else |
| 84 | + { |
| 85 | + timerInterval = -1; |
| 86 | + } |
| 87 | + LogCallback?.Invoke($"ReceiveReconnectingEffectHandler ReconnectionPolicy = {ReconnectionPolicy}; Interval = {timerInterval}"); |
| 88 | + |
| 89 | + if (timer != null) |
| 90 | + { |
| 91 | + timer.Change(Timeout.Infinite, Timeout.Infinite); |
| 92 | + } |
| 93 | + if (timerInterval != -1) |
| 94 | + { |
| 95 | + timer = new Timer(new TimerCallback(ReceiveReconnectTimerCallback), null, |
| 96 | + (-1 == timerInterval) ? Timeout.Infinite : timerInterval * 1000, Timeout.Infinite); |
| 97 | + } |
| 98 | + else |
| 99 | + { |
| 100 | + PrepareFailurePNStatus(new ReceiveError() { Status = 400 }); |
| 101 | + PrepareAndEmitReceiveReconnectGiveupEvent(null); |
| 102 | + } |
| 103 | + } |
| 104 | + |
| 105 | + private void ReceiveReconnectTimerCallback(object state) |
| 106 | + { |
| 107 | + LogCallback?.Invoke("ReceiveReconnectingEffectHandler Timer interval invoke"); |
| 108 | + ReceiveReconnectRequestEventArgs args = new ReceiveReconnectRequestEventArgs(); |
| 109 | + args.ExtendedState = extendedState; |
| 110 | + args.ReceiveReconnectResponseCallback = OnReceiveReconnectEffectResponseReceived; |
| 111 | + OnReceiveReconnectRequested(args); |
| 112 | + } |
| 113 | + |
| 114 | + public void OnReceiveReconnectEffectResponseReceived(string json) |
| 115 | + { |
| 116 | + try |
| 117 | + { |
| 118 | + LogCallback?.Invoke($"OnReceiveReconnectEffectResponseReceived Json Response = {json}"); |
| 119 | + var receivedResponse = JsonConvert.DeserializeObject<ReceiveingResponse<object>>(json); |
| 120 | + if (receivedResponse != null && receivedResponse.Timetoken != null) |
| 121 | + { |
| 122 | + receiveMessages = receivedResponse.Messages; |
| 123 | + |
| 124 | + ReceiveReconnectSuccess receiveReconnectSuccessEvent = new ReceiveReconnectSuccess(); |
| 125 | + receiveReconnectSuccessEvent.SubscriptionCursor = new SubscriptionCursor(); |
| 126 | + receiveReconnectSuccessEvent.SubscriptionCursor.Timetoken = receivedResponse.Timetoken.Timestamp; |
| 127 | + receiveReconnectSuccessEvent.SubscriptionCursor.Region = receivedResponse.Timetoken.Region; |
| 128 | + receiveReconnectSuccessEvent.EventPayload.Timetoken = receivedResponse.Timetoken.Timestamp; |
| 129 | + receiveReconnectSuccessEvent.EventPayload.Region = receivedResponse.Timetoken.Region; |
| 130 | + receiveReconnectSuccessEvent.EventType = EventType.ReceiveReconnectSuccess; |
| 131 | + receiveReconnectSuccessEvent.Name = "RECEIVE_RECONNECT_SUCCESS"; |
| 132 | + LogCallback?.Invoke("OnReceiveReconnectEffectResponseReceived - EventType.ReceiveReconnectSuccess"); |
| 133 | + |
| 134 | + pnStatus = new PNStatus(); |
| 135 | + pnStatus.StatusCode = 200; |
| 136 | + pnStatus.Operation = PNOperationType.PNSubscribeOperation; |
| 137 | + pnStatus.AffectedChannels = extendedState.Channels; |
| 138 | + pnStatus.AffectedChannelGroups = extendedState.ChannelGroups; |
| 139 | + pnStatus.Category = PNStatusCategory.PNConnectedCategory; |
| 140 | + pnStatus.Error = false; |
| 141 | + |
| 142 | + extendedState.Attempts = 0; |
| 143 | + |
| 144 | + eventEmitter.emit(receiveReconnectSuccessEvent); |
| 145 | + } |
| 146 | + else |
| 147 | + { |
| 148 | + ReceiveReconnectFailure receiveReconnectFailureEvent = new ReceiveReconnectFailure(); |
| 149 | + receiveReconnectFailureEvent.Name = "RECEIVE_RECONNECT_FAILURE"; |
| 150 | + receiveReconnectFailureEvent.EventType = EventType.ReceiveReconnectFailure; |
| 151 | + LogCallback?.Invoke("OnReceivingReconnectEffectResponseReceived - EventType.ReceiveReconnectFailure"); |
| 152 | + |
| 153 | + pnStatus = new PNStatus(); |
| 154 | + pnStatus.Operation = PNOperationType.PNSubscribeOperation; |
| 155 | + pnStatus.AffectedChannels = extendedState.Channels; |
| 156 | + pnStatus.AffectedChannelGroups = extendedState.ChannelGroups; |
| 157 | + pnStatus.Error = true; |
| 158 | + |
| 159 | + |
| 160 | + var receiveReconnectError = JsonConvert.DeserializeObject<ReceiveError>(json); |
| 161 | + extendedState.Attempts++; |
| 162 | + PrepareFailurePNStatus(receiveReconnectError); |
| 163 | + |
| 164 | + if (MaxRetries != -1 && extendedState.Attempts > MaxRetries) |
| 165 | + { |
| 166 | + LogCallback?.Invoke($"Attempt: {extendedState.Attempts}; OnReceivingReconnectEffectResponseReceived - EventType.ReceiveReconnectGiveUp"); |
| 167 | + PrepareAndEmitReceiveReconnectGiveupEvent(null); |
| 168 | + } |
| 169 | + else |
| 170 | + { |
| 171 | + LogCallback?.Invoke($"Attempt: {extendedState.Attempts}; OnReceivingReconnectEffectResponseReceived - EventType.ReceiveReconnectFailure"); |
| 172 | + PrepareAndEmitReceiveReconnectFailureEvent(null); |
| 173 | + } |
| 174 | + } |
| 175 | + } |
| 176 | + catch (Exception ex) |
| 177 | + { |
| 178 | + extendedState.Attempts++; |
| 179 | + PrepareFailurePNStatus(new ReceiveError() { Status = 400 }); |
| 180 | + |
| 181 | + if (MaxRetries != -1 && extendedState.Attempts > MaxRetries) |
| 182 | + { |
| 183 | + LogCallback?.Invoke($"Attempt: {extendedState.Attempts}; OnHandshakeReconnectEffectResponseReceived - EventType.ReceiveReconnectGiveUp"); |
| 184 | + PrepareAndEmitReceiveReconnectGiveupEvent(null); |
| 185 | + |
| 186 | + } |
| 187 | + else |
| 188 | + { |
| 189 | + LogCallback?.Invoke($"Attempt: {extendedState.Attempts}; OnHandshakeReconnectEffectResponseReceived - EventType.ReceiveReconnectFailure"); |
| 190 | + PrepareAndEmitReceiveReconnectFailureEvent(ex); |
| 191 | + } |
| 192 | + } |
| 193 | + finally |
| 194 | + { |
| 195 | + if (timer != null) |
| 196 | + { |
| 197 | + try |
| 198 | + { |
| 199 | + timer.Change(Timeout.Infinite, Timeout.Infinite); |
| 200 | + } |
| 201 | + catch { } |
| 202 | + } |
| 203 | + } |
| 204 | + } |
| 205 | + |
| 206 | + private void PrepareFailurePNStatus(ReceiveError error) |
| 207 | + { |
| 208 | + pnStatus = new PNStatus(); |
| 209 | + pnStatus.StatusCode = (error != null && error.Status != 0) ? error.Status : 504; |
| 210 | + pnStatus.Operation = PNOperationType.PNSubscribeOperation; |
| 211 | + pnStatus.AffectedChannels = extendedState.Channels; |
| 212 | + pnStatus.AffectedChannelGroups = extendedState.ChannelGroups; |
| 213 | + pnStatus.Category = PNStatusCategory.PNNetworkIssuesCategory; |
| 214 | + pnStatus.Error = true; |
| 215 | + } |
| 216 | + |
| 217 | + private void PrepareAndEmitReceiveReconnectFailureEvent(Exception ex) |
| 218 | + { |
| 219 | + ReceiveReconnectFailure receiveReconnectFailureEvent = new ReceiveReconnectFailure(); |
| 220 | + receiveReconnectFailureEvent.Name = "RECEIVE_RECONNECT_FAILURE"; |
| 221 | + receiveReconnectFailureEvent.EventType = EventType.ReceiveReconnectFailure; |
| 222 | + receiveReconnectFailureEvent.Attempts = extendedState.Attempts; |
| 223 | + if (ex != null) |
| 224 | + { |
| 225 | + receiveReconnectFailureEvent.EventPayload.exception = ex; |
| 226 | + } |
| 227 | + |
| 228 | + eventEmitter.emit(receiveReconnectFailureEvent); |
| 229 | + } |
| 230 | + |
| 231 | + private void PrepareAndEmitReceiveReconnectGiveupEvent(Exception ex) |
| 232 | + { |
| 233 | + ReceiveReconnectGiveUp receiveReconnectGiveupEvent = new ReceiveReconnectGiveUp(); |
| 234 | + receiveReconnectGiveupEvent.Name = "RECEIVE_RECONNECT_GIVEUP"; |
| 235 | + receiveReconnectGiveupEvent.EventType = EventType.ReceiveReconnectGiveUp; |
| 236 | + receiveReconnectGiveupEvent.Attempts = extendedState.Attempts; |
| 237 | + if (ex != null) |
| 238 | + { |
| 239 | + receiveReconnectGiveupEvent.EventPayload.exception = ex; |
| 240 | + } |
| 241 | + |
| 242 | + eventEmitter.emit(receiveReconnectGiveupEvent); |
| 243 | + } |
| 244 | + |
| 245 | + public void Cancel() |
| 246 | + { |
| 247 | + if (cancellationTokenSource != null) |
| 248 | + { |
| 249 | + LogCallback?.Invoke($"ReceiveReconnectEffectHandler - cancellationTokenSource - cancellion attempted."); |
| 250 | + cancellationTokenSource.Cancel(); |
| 251 | + } |
| 252 | + LogCallback?.Invoke($"ReceiveReconnectEffectHandler - invoking OnCancelReceiveReconnectRequested."); |
| 253 | + CancelReceiveReconnectRequestEventArgs args = new CancelReceiveReconnectRequestEventArgs(); |
| 254 | + OnCancelReceiveReconnectRequested(args); |
| 255 | + } |
| 256 | + public void Run(ExtendedState context) |
| 257 | + { |
| 258 | + if (AnnounceStatus != null && pnStatus != null) |
| 259 | + { |
| 260 | + AnnounceStatus(pnStatus); |
| 261 | + } |
| 262 | + } |
| 263 | + public PNStatus GetPNStatus() |
| 264 | + { |
| 265 | + return pnStatus; |
| 266 | + } |
| 267 | + } |
| 268 | +} |
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