112 lines
3.7 KiB
C#
112 lines
3.7 KiB
C#
using Api.DBAccess;
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using Api.Models;
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using Microsoft.IdentityModel.Tokens;
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using RabbitMQ.Client;
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using RabbitMQ.Client.Events;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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namespace Api.AMQP
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{
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public class AMQPPublisher
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{
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private readonly IConfiguration _configuration;
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private readonly DbAccess _dbAccess;
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private IConnection _conn;
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private IChannel _channel;
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private ConnectionFactory _factory;
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private string _queue;
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public AMQPPublisher(IConfiguration configuration, DbAccess dbAccess)
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{
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_dbAccess = dbAccess;
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_configuration = configuration;
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_factory = new ConnectionFactory();
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_queue = "temperature-limits";
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InitFactory();
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}
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public async Task Handle_Push_Device_Limits()
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{
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while (true)
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{
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await Connect();
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// Publishes all devices limits
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var devices = _dbAccess.ReadDevices();
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foreach (var device in devices)
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{
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var deviceLimit = new DeviceLimit();
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deviceLimit.ReferenceId = device.ReferenceId;
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deviceLimit.TempHigh = device.TempHigh;
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deviceLimit.TempLow = device.TempLow;
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string message = JsonSerializer.Serialize(deviceLimit);
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var body = Encoding.UTF8.GetBytes(message);
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await _channel.BasicPublishAsync(exchange: string.Empty, routingKey: _queue, body: body);
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}
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// Short delay before disconnecting from rabbitMQ
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await Task.Delay(1000);
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// Disconnecting from rabbitMQ to save resources
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await Dispose();
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// 1 hour delay
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await Task.Delay(3600000);
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await Connect();
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// Here all messages is consumed so the queue is empty
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var consumer = new AsyncEventingBasicConsumer(_channel);
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consumer.ReceivedAsync += (model, ea) =>
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{
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Console.WriteLine("Emptying queue");
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return Task.CompletedTask;
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};
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// Consumes the data in the queue
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await _channel.BasicConsumeAsync(_queue, true, consumer);
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// Short delay before disconnecting from rabbitMQ
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await Task.Delay(1000);
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await Dispose();
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}
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}
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// Disconnects from rabbitMQ
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private async Task<bool> Dispose()
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{
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await _channel.CloseAsync();
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await _conn.CloseAsync();
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await _channel.DisposeAsync();
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await _conn.DisposeAsync();
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return true;
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}
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// Connects to rabbitMQ
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private async Task<bool> Connect()
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{
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// Creating a new connection to rabbitMQ
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_conn = await _factory.CreateConnectionAsync();
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Console.WriteLine("AMQPClient connected");
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_channel = await _conn.CreateChannelAsync();
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// Here we connect to the queue through the channel that got created earlier
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await _channel.QueueDeclareAsync(queue: _queue, durable: false, exclusive: false, autoDelete: false);
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Console.WriteLine($"{_queue} connected");
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return true;
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}
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// The info for the factory
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private void InitFactory()
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{
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_factory.UserName = _configuration["AMQP:username"];
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_factory.Password = _configuration["AMQP:password"];
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_factory.HostName = _configuration["AMQP:host"];
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_factory.Port = Convert.ToInt32(_configuration["AMQP:port"]);
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}
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}
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}
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