private async Task HandleSubscribeAsync(ControlMessage subscribeMessage) { WSMessage outboundMessage = null; if (subscribeMessage.ClientId != this.state.ClientId && this.state.ClientId != null) { outboundMessage = new WSMessage { Kind = WSMessage.DISCRIMINATOR.SERVER__RESULT, Payload = $"Error: ClientId mismatch ! " }; outboundQueue.Add(outboundMessage.ToJson()); return; } if (await state.redisDB.HashExistsAsync(this.state.ClientId = subscribeMessage.ClientId, subscribeMessage.Channel)) { outboundMessage = new WSMessage { Kind = WSMessage.DISCRIMINATOR.SERVER__RESULT, Payload = $"Error: ALREADY SUBSCRIBED TO CHANNEL {subscribeMessage.Channel}" }; outboundQueue.Add(outboundMessage.ToJson()); return; } await this.state.subscriber.SubscribeAsync(subscribeMessage.Channel, this.OnRedisMessageHandler); await state.redisDB.HashSetAsync(subscribeMessage.ClientId, subscribeMessage.Channel, "set"); outboundMessage = new WSMessage { Kind = WSMessage.DISCRIMINATOR.SERVER__RESULT, Payload = $"Subscribed to channel : {subscribeMessage.Channel} SUCCESSFULLY !" }; outboundQueue.Add(outboundMessage.ToJson()); }
// message handling routine // SUBSCRIBE- adds channel to redis hashset // UNSUBSCRIBE- deletes channel from redis hashset // MESSAGE - publishes redis message to target channel // GET_CHANNELS - fetches all user subscribed channels from redis hashset private async Task HandleMessageAsync(WSMessage message) { switch (message.Kind) { case WSMessage.DISCRIMINATOR.CLIENT__SUBSCRIBE: ControlMessage subscribeMessage = JsonSerializer.Deserialize <ControlMessage>(message.Payload); await this.HandleSubscribeAsync(subscribeMessage); break; case WSMessage.DISCRIMINATOR.CLIENT_UNSUBSCRIBE: ControlMessage unsubscribeMessage = JsonSerializer.Deserialize <ControlMessage>(message.Payload); await this.HandleUnsubscribeAsync(unsubscribeMessage); break; case WSMessage.DISCRIMINATOR.CLIENT_MESSAGE: ChatMessage chatMessage = JsonSerializer.Deserialize <ChatMessage>(message.Payload); await this.HandleMessageAsync(chatMessage); break; case WSMessage.DISCRIMINATOR.CLIENT_GET_CHANNELS: await this.HandleGetChannelsAsync(message); break; } }
private async Task HandleUnsubscribeAsync(ControlMessage unsubscribeMessage) { WSMessage outboundMessage = null; bool deleted = await state.redisDB.HashDeleteAsync(this.state.ClientId, unsubscribeMessage.Channel); if (!deleted) { outboundMessage = new WSMessage { Kind = WSMessage.DISCRIMINATOR.SERVER__RESULT, Payload = $" UNSUBSCRIBE UNSUCCESSFUL" }; outboundQueue.Add(outboundMessage.ToJson()); return; } await this.state.subscriber.UnsubscribeAsync(unsubscribeMessage.Channel, this.OnRedisMessageHandler); outboundMessage = new WSMessage { Kind = WSMessage.DISCRIMINATOR.SERVER__RESULT, Payload = $" UNSUBSCRIBE SUCCESSFUL" }; outboundQueue.Add(outboundMessage.ToJson()); }