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Convert serial reader from console to web API

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This commit is contained in:
Chris Kaczor
2021-06-14 15:51:47 -04:00
parent c9f27b2c60
commit a52fbd0282
8 changed files with 251 additions and 159 deletions
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27
Weather/SerialReader/Controllers/HealthController.cs Normal file
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@@ -0,0 +1,27 @@
using Microsoft.AspNetCore.Mvc;
using System;
namespace ChrisKaczor.HomeMonitor.Weather.SerialReader.Controllers
{
[Route("[controller]")]
[ApiController]
public class HealthController : ControllerBase
{
private readonly TimeSpan _checkTimeSpan = TimeSpan.FromSeconds(5);
[HttpGet("ready")]
public IActionResult Ready()
{
return SerialReader.BoardStarted ? Ok() : Conflict();
}
[HttpGet("health")]
public IActionResult Health()
{
var lastReading = SerialReader.LastReading;
var timeSinceLastReading = DateTimeOffset.UtcNow - lastReading;
return timeSinceLastReading <= _checkTimeSpan ? Ok(lastReading) : BadRequest(lastReading);
}
}
}

163
Weather/SerialReader/Program.cs
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@@ -1,163 +1,20 @@
using ChrisKaczor.HomeMonitor.Weather.Models;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using RabbitMQ.Client;
using System;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
namespace ChrisKaczor.HomeMonitor.Weather.SerialReader
{
internal static class Program
public static class Program
{
private static IConfiguration _configuration;
private static bool _boardStarting;
private static readonly CancellationTokenSource CancellationTokenSource = new CancellationTokenSource();
private static void Main()
public static void Main(string[] args)
{
WriteLog("Starting");
Console.CancelKeyPress += OnCancelKeyPress;
_configuration = new ConfigurationBuilder()
.AddJsonFile("appsettings.json", false, false)
.AddEnvironmentVariables()
.Build();
var baudRate = int.Parse(_configuration["Weather:Port:BaudRate"]);
while (!CancellationTokenSource.Token.IsCancellationRequested)
{
try
{
WriteLog("Starting main loop");
Thread.Sleep(1000);
var port = GetPort();
if (port == null)
continue;
using var serialPort = new SerialPort(port, baudRate) { NewLine = "\r\n" };
WriteLog("Opening serial port");
serialPort.Open();
_boardStarting = false;
var factory = new ConnectionFactory
{
HostName = _configuration["Weather:Queue:Host"],
UserName = _configuration["Weather:Queue:User"],
Password = _configuration["Weather:Queue:Password"]
};
WriteLog("Connecting to queue server");
using var connection = factory.CreateConnection();
using var model = connection.CreateModel();
WriteLog("Declaring queue");
model.QueueDeclare(_configuration["Weather:Queue:Name"], true, false, false, null);
WriteLog("Starting serial read loop");
ReadSerial(serialPort, model);
}
catch (Exception exception)
{
WriteLog($"Exception: {exception}");
}
CreateHostBuilder(args).Build().Run();
}
WriteLog("Exiting");
}
private static void ReadSerial(SerialPort serialPort, IModel model)
private static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
while (!CancellationTokenSource.Token.IsCancellationRequested)
{
try
{
var message = serialPort.ReadLine();
if (!_boardStarting)
{
_boardStarting = message.Contains("Board starting");
if (_boardStarting)
WriteLog("Board starting");
}
if (!_boardStarting)
{
WriteLog($"Message received but board not starting: {message}");
continue;
}
WriteLog($"Message received: {message}");
var weatherMessage = WeatherMessage.Parse(message);
var messageString = JsonConvert.SerializeObject(weatherMessage);
var body = Encoding.UTF8.GetBytes(messageString);
var properties = model.CreateBasicProperties();
properties.Persistent = true;
model.BasicPublish(string.Empty, _configuration["Weather:Queue:Name"], properties, body);
}
catch (TimeoutException)
{
WriteLog("Serial port read timeout");
}
}
}
private static void OnCancelKeyPress(object sender, ConsoleCancelEventArgs args)
{
args.Cancel = true;
CancellationTokenSource.Cancel();
}
private static string GetPort()
{
var portPrefix = _configuration["Weather:Port:Prefix"];
while (!CancellationTokenSource.Token.IsCancellationRequested)
{
WriteLog($"Checking for port starting with: {portPrefix}");
var ports = SerialPort.GetPortNames();
var port = Array.Find(ports, p => p.StartsWith(portPrefix));
if (port != null)
{
WriteLog($"Port found: {port}");
return port;
}
WriteLog("Port not found - waiting");
Thread.Sleep(1000);
}
return null;
}
private static void WriteLog(string message)
{
Console.WriteLine(message);
}
webBuilder.UseStartup<Startup>();
});
}
}

3
Weather/SerialReader/Properties/launchSettings.json
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@@ -1,11 +1,12 @@
{
"$schema": "http://json.schemastore.org/launchsettings.json",
"profiles": {
"SerialReader": {
"commandName": "Project",
"launchBrowser": false,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"dotnetRunMessages": "true",
"applicationUrl": "http://localhost:62648/"
}
}

170
Weather/SerialReader/SerialReader.cs Normal file
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@@ -0,0 +1,170 @@
using ChrisKaczor.HomeMonitor.Weather.Models;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Newtonsoft.Json;
using RabbitMQ.Client;
using System;
using System.IO.Ports;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace ChrisKaczor.HomeMonitor.Weather.SerialReader
{
public class SerialReader : IHostedService
{
private readonly IConfiguration _configuration;
public static bool BoardStarted { get; private set; }
public static DateTimeOffset LastReading { get; private set; }
private CancellationToken _cancellationToken;
public SerialReader(IConfiguration configuration)
{
_configuration = configuration;
}
public Task StartAsync(CancellationToken cancellationToken)
{
_cancellationToken = cancellationToken;
Task.Run(Execute, cancellationToken);
return Task.CompletedTask;
}
private void Execute()
{
var baudRate = int.Parse(_configuration["Weather:Port:BaudRate"]);
while (!_cancellationToken.IsCancellationRequested)
{
try
{
WriteLog("Starting main loop");
Thread.Sleep(1000);
var port = GetPort();
if (port == null)
continue;
using var serialPort = new SerialPort(port, baudRate) { NewLine = "\r\n" };
WriteLog("Opening serial port");
serialPort.Open();
BoardStarted = false;
var factory = new ConnectionFactory
{
HostName = _configuration["Weather:Queue:Host"],
UserName = _configuration["Weather:Queue:User"],
Password = _configuration["Weather:Queue:Password"]
};
WriteLog("Connecting to queue server");
using var connection = factory.CreateConnection();
using var model = connection.CreateModel();
WriteLog("Declaring queue");
model.QueueDeclare(_configuration["Weather:Queue:Name"], true, false, false, null);
WriteLog("Starting serial read loop");
ReadSerial(serialPort, model);
}
catch (Exception exception)
{
WriteLog($"Exception: {exception}");
}
}
}
private void ReadSerial(SerialPort serialPort, IModel model)
{
while (!_cancellationToken.IsCancellationRequested)
{
try
{
var message = serialPort.ReadLine();
if (!BoardStarted)
{
BoardStarted = message.Contains("Board started");
if (BoardStarted)
WriteLog("Board started");
}
if (!BoardStarted)
{
WriteLog($"Message received but board not started: {message}");
continue;
}
LastReading = DateTimeOffset.UtcNow;
WriteLog($"Message received: {message}");
var weatherMessage = WeatherMessage.Parse(message);
var messageString = JsonConvert.SerializeObject(weatherMessage);
var body = Encoding.UTF8.GetBytes(messageString);
var properties = model.CreateBasicProperties();
properties.Persistent = true;
model.BasicPublish(string.Empty, _configuration["Weather:Queue:Name"], properties, body);
}
catch (TimeoutException)
{
WriteLog("Serial port read timeout");
}
}
}
private string GetPort()
{
var portPrefix = _configuration["Weather:Port:Prefix"];
while (!_cancellationToken.IsCancellationRequested)
{
WriteLog($"Checking for port starting with: {portPrefix}");
var ports = SerialPort.GetPortNames();
var port = Array.Find(ports, p => p.StartsWith(portPrefix));
if (port != null)
{
WriteLog($"Port found: {port}");
return port;
}
WriteLog("Port not found - waiting");
Thread.Sleep(1000);
}
return null;
}
private static void WriteLog(string message)
{
Console.WriteLine(message);
}
public Task StopAsync(CancellationToken cancellationToken)
{
return Task.CompletedTask;
}
}
}

2
Weather/SerialReader/SerialReader.csproj
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@@ -1,4 +1,4 @@
<Project Sdk="Microsoft.NET.Sdk.Web">
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<OutputType>Exe</OutputType>

5
Weather/SerialReader/SerialReader.csproj.user
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@@ -1,6 +1,9 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<DebuggerFlavor>ProjectDebugger</DebuggerFlavor>
</PropertyGroup>
<PropertyGroup>
<ActiveDebugProfile>IIS Express</ActiveDebugProfile>
<ActiveDebugProfile>SerialReader</ActiveDebugProfile>
</PropertyGroup>
</Project>

34
Weather/SerialReader/Startup.cs Normal file
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@@ -0,0 +1,34 @@
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
namespace ChrisKaczor.HomeMonitor.Weather.SerialReader
{
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddControllers();
services.AddHostedService<SerialReader>();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
}
}

2
Weather/Weather.sln
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@@ -9,7 +9,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Models", "Models\Models.csp
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Service", "Service\Service.csproj", "{914B9DB9-3BCD-4B55-8289-2E59D6CA96BA}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ModelsTests", "ModelsTests\ModelsTests.csproj", "{F83A3E8C-3A03-4264-B136-1FBE569A9411}"
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ModelsTests", "ModelsTests\ModelsTests.csproj", "{F83A3E8C-3A03-4264-B136-1FBE569A9411}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution