Init

Cachet-Monitor.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29728.190
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Cachet-Monitor", "Cachet-Monitor\Cachet-Monitor.csproj", "{95DC5C5F-1837-4577-BD25-CA8BE900060D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{95DC5C5F-1837-4577-BD25-CA8BE900060D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{95DC5C5F-1837-4577-BD25-CA8BE900060D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{95DC5C5F-1837-4577-BD25-CA8BE900060D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{95DC5C5F-1837-4577-BD25-CA8BE900060D}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {564B86A6-C853-4278-B04A-BF3776B746B0}
+	EndGlobalSection
+EndGlobal

Cachet-Monitor/Cachet-Monitor.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RootNamespace>Cachet_Monitor</RootNamespace>
+    <AssemblyVersion>2020.2.24.0</AssemblyVersion>
+    <FileVersion>2020.2.24.0</FileVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CachNet" Version="0.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="RestEase" Version="1.4.10" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="CachNet">
+      <HintPath>..\CachNet.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+</Project>

Cachet-Monitor/Models/Configuration/Configuration.cs

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+using Cachet_Monitor.Models.Config;
+using System;
+using System.Collections.Generic;
+
+namespace Cachet_Monitor.Models
+{
+    public class Configuration
+    {
+        public Uri ApiBase { get; set; }
+        public string ApiKey { get; set; }
+
+        public List<Monitor> Monitors { get; set; }
+
+        public static Configuration Default = new Configuration
+        {
+            ApiBase = new Uri("https://domain.example.com"),
+            ApiKey = "AAABBBCCC11223344556",
+            Monitors = new List<Monitor>
+            {
+                new Monitor
+                {
+                    Name = "Website",
+                    Target = "https://example.com",
+                    ComponentId = 1,
+                    MetricId = 1,
+                    Interval = 60,
+                    Timeout = 5,
+                    Type = MonitorType.HTTP,
+                    Settings = new MonitorSettings
+                    {
+                        ExpectedStatusCode = 200,
+                        Method = "GET"
+                    }
+                },
+                new Monitor
+                {
+                    Name = "Database",
+                    Target = "example.com",
+                    ComponentId = 1,
+                    MetricId = 1,
+                    Interval = 60,
+                    Timeout = 5,
+                    Type = MonitorType.PORT,
+                    Settings = new MonitorSettings
+                    {
+                        Port = 3306
+                    }
+                },
+                new Monitor
+                {
+                    Name = "Server",
+                    Target = "example.com",
+                    ComponentId = 1,
+                    MetricId = 1,
+                    Interval = 60,
+                    Timeout = 5,
+                    Type = MonitorType.ICMP
+                }
+            }
+        };
+    }
+}

Cachet-Monitor/Models/Configuration/Monitor/Monitor.cs

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+namespace Cachet_Monitor.Models.Config
+{
+    public class Monitor
+    {
+        //Meta
+        public string Name;
+
+        public string Target;
+
+        //Cachet
+        public int ComponentId;
+
+        public int MetricId;
+
+        //Timing
+        public int Interval;
+
+        public int Timeout;
+
+        public MonitorType Type;
+
+        public MonitorSettings Settings;
+    }
+}

Cachet-Monitor/Models/Configuration/Monitor/MonitorSettings.cs

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+namespace Cachet_Monitor.Models.Config
+{
+    public class MonitorSettings
+    {
+        //Http
+        public string Method = "GET";
+
+        public int ExpectedStatusCode = 200;
+
+        //TCP
+        public int Port;
+
+        public int TTL;
+    }
+}

Cachet-Monitor/Models/Configuration/Monitor/MonitorType.cs

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+using System;
+
+namespace Cachet_Monitor.Models.Config
+{
+    public enum MonitorType
+    {
+        HTTP,
+        PORT,
+        ICMP
+    }
+}

Cachet-Monitor/Program.cs

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+using Cachet_Monitor.Models;
+using Cachet_Monitor.Models.Config;
+using Monitor = Cachet_Monitor.Models.Config.Monitor;
+using CachNet;
+using Newtonsoft.Json;
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using System.Threading;
+using System.Net.Sockets;
+using System.Net;
+using System.Diagnostics;
+using CachNet.Entities;
+using System.Net.NetworkInformation;
+
+namespace Cachet_Monitor
+{
+    internal class Program
+    {
+        private static Configuration Configuration;
+        private static CachetClient Cachet;
+
+        private static void Main()
+        {
+            {
+                var config = Path.Combine(Environment.CurrentDirectory, "settings.json");
+
+                if (File.Exists(config))
+                {
+                    Configuration = JsonConvert.DeserializeObject<Configuration>(File.ReadAllText(config));
+                }
+                else
+                {
+                    File.WriteAllText(config, JsonConvert.SerializeObject(Configuration.Default, Formatting.Indented));
+
+                    Console.WriteLine($"Written a new instance of the configuration to: {config}");
+                    Console.ReadKey();
+                    Environment.Exit(0);
+                }
+            }
+
+            Cachet = new CachetClient(Configuration.ApiBase.OriginalString, Configuration.ApiKey);
+
+            MainAsync().GetAwaiter().GetResult();
+        }
+
+        private static async Task MainAsync()
+        {
+            foreach (var monitor in Configuration.Monitors)
+            {
+                new Thread(async () =>
+                {
+                    Thread.CurrentThread.IsBackground = true;
+                    while (true)
+                    {
+                        await DoMonitorCheck(Cachet, monitor).ConfigureAwait(false);
+
+                        await Task.Delay(monitor.Interval * 1000);
+                    }
+                }).Start();
+            }
+
+            await Task.Delay(-1).ConfigureAwait(false);
+        }
+
+        private static async Task DoMonitorCheck(CachetClient Cachet, Monitor monitor)
+        {
+            ComponentStatus componentStatus = 0;
+            switch (monitor.Type)
+            {
+                case MonitorType.PORT:
+                    {
+                        using (TcpClient tcpClient = new TcpClient())
+                        {
+                            try
+                            {
+                                tcpClient.Connect(monitor.Target, monitor.Settings.Port);
+                                await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                {
+                                    Status = ComponentStatus.Operational,
+                                });
+                            }
+                            catch (Exception)
+                            {
+                                await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                {
+                                    Status = ComponentStatus.MajorOutage,
+                                });
+                            }
+                        }
+                    }
+                    break;
+
+                case MonitorType.ICMP:
+                    {
+                        Ping ping = new Ping();
+                        PingOptions options = new PingOptions
+                        {
+                            DontFragment = true,
+                            Ttl = monitor.Settings.TTL
+                        };
+
+                        PingReply reply = ping.Send(monitor.Target, monitor.Timeout, null, options);
+
+                        await Cachet.AddMetricPointAsync(monitor.MetricId, new PostMetricPoint
+                        {
+                            Value = (int)reply.RoundtripTime
+                        });
+
+                        if (reply.Status == IPStatus.Success)
+                        {
+                            await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                            {
+                                Status = ComponentStatus.Operational,
+                            });
+                        }
+
+                        if (reply.RoundtripTime >= monitor.Timeout)
+                        {
+                            await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                            {
+                                Status = ComponentStatus.PerformanceIssues,
+                            });
+                        }
+
+                        if (reply.Status != IPStatus.Success)
+                        {
+                            if (reply.Status == IPStatus.TimedOut)
+                            {
+                                await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                {
+                                    Status = ComponentStatus.PartialOutage,
+                                });
+                            }
+                            else
+                            {
+                                await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                {
+                                    Status = ComponentStatus.MajorOutage,
+                                });
+                            }
+                        }
+                    }
+                    break;
+
+                case MonitorType.HTTP:
+                    {
+                        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(monitor.Target);
+                        request.Timeout = monitor.Timeout * 1000;
+
+                        Stopwatch timer = new Stopwatch();
+
+                        timer.Start();
+                        try
+                        {
+                            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
+                            timer.Stop();
+
+                            if (response.StatusCode == (HttpStatusCode)monitor.Settings.ExpectedStatusCode)
+                            {
+                                var x = await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                {
+                                    Status = ComponentStatus.Operational,
+                                });
+                            }
+                            else
+                            {
+                                await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                {
+                                    Status = ComponentStatus.PartialOutage,
+                                });
+                            }
+
+                            response.Close();
+                        }
+                        catch (WebException ex)
+                        {
+                            timer.Stop();
+
+                            if (ex.Status == WebExceptionStatus.ProtocolError)
+                            {
+                                if (ex.Response is HttpWebResponse response)
+                                {
+                                    if (response.StatusCode == (HttpStatusCode)monitor.Settings.ExpectedStatusCode)
+                                    {
+                                        await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                        {
+                                            Status = ComponentStatus.Operational,
+                                        });
+                                    }
+                                }
+                            }
+                            else
+                            {
+                                if (ex.Status == WebExceptionStatus.Timeout)
+                                {
+                                    await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                    {
+                                        Status = ComponentStatus.PerformanceIssues,
+                                    });
+                                }
+                                else
+                                {
+                                    await Cachet.UpdateComponentAsync(monitor.ComponentId, new PutComponent
+                                    {
+                                        Status = ComponentStatus.MajorOutage,
+                                    });
+                                }
+                            }
+                        }
+
+                        await Cachet.AddMetricPointAsync(monitor.MetricId, new PostMetricPoint
+                        {
+                            Value = (int)timer.ElapsedMilliseconds
+                        });
+                    }
+                    break;
+            }
+
+            Console.WriteLine($"Ran check on \"{monitor.Target}\" Status: {componentStatus}");
+        }
+    }
+}