Add support to variable sequences and file based configuration

README.md

@@ -27,13 +27,13 @@ A single AMQP connection can handle approximately 995 devices.
 The quickest way to generate telemetry is using Docker with the following command:
 
 ```bash
-docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator:latest
+docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator
 ```
 
 **The simulator expects the devices to already exist in Azure IoT Hub**. If you need help creating simulation devices in an Azure IoT Hub use the included project IotSimulatorDeviceProvisioning or the Docker image:
 
 ```bash
-docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=registryReadWrite;SharedAccessKey=your-iothub-key" -e DeviceCount=1000 mcr.microsoft.com/oss/azure-samples/azureiot-simulatordeviceprovisioning:latest
+docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=registryReadWrite;SharedAccessKey=your-iothub-key" -e DeviceCount=1000 mcr.microsoft.com/oss/azure-samples/azureiot-simulatordeviceprovisioning
 ```
 
 ## Simulator input parameters
@@ -60,6 +60,8 @@ The amount of devices, their names and telemetry generated can be customized usi
 |PartitionKey|optional [partition key](https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-features#partitions) template for Event Hubs (see telemetry template and [Advanced options](#advanced-options))|
 |Variables|telemetry variables (see telemetry template)|
 |DuplicateEveryNEvents|if > 0, send duplicates of the given fraction of messages. See [Advanced options](#advanced-options) (default = 0)|
+|File|Defines a json file where templates, variables and device based intervals can be defined. File and environment variable configuration can be used in conjunction.|
+|Intervals|Allows customizing the message interval per device|
 
 ## Telemetry template
 
@@ -99,6 +101,8 @@ Customizable variables can be created with the following properties:
 |max|The maximum value generated|
 |values|Defines an array of possible values. Example ["on", "off"]|
 |customlengthstring|Creates a random string of n bytes. Provide n as parameter|
+|sequence|Create a sequence of values as defined in `values` property, producing one after the other. Values can reference other non-sequence variables|
+
 
 #### Example 1: Telemetry with temperature between 23 and 25 and a counter starting from 100
 
@@ -125,13 +129,13 @@ Output:
 Running with Docker:
 
 ```powershell
-docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" -e Template="{ \"deviceId\": \"$.DeviceId\", \"temp\": $.Temp, \"Ticks\": $.Ticks, \"Counter\": $.Counter, \"time\": \"$.Time\" }" -e Variables="[{name: \"Temp\", \"random\": true, \"max\": 25, \"min\": 23}, {\"name\":\"Counter\", \"min\":100} ]" mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator:latest
+docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" -e Template="{ \"deviceId\": \"$.DeviceId\", \"temp\": $.Temp, \"Ticks\": $.Ticks, \"Counter\": $.Counter, \"time\": \"$.Time\" }" -e Variables="[{name: \"Temp\", \"random\": true, \"max\": 25, \"min\": 23}, {\"name\":\"Counter\", \"min\":100} ]" mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator
 ```
 
 calling from PowerShell:
 
 ```powershell
-docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=iothubowner;SharedAccessKey=your-iothub-key" -e Template="{ \"""deviceId\""": \"""$.DeviceId\""", \"""temp\""": $.Temp, \"""Ticks\""": $.Ticks, \"""Counter\""": $.Counter, \"""time\""": \"""$.Time\""", \"""engine\""": \"""$.Engine\""" }" -e Variables="[{name: \"""Temp\""", \"""random\""": true, \"""max\""": 25, \"""min\""": 23}, {\"""name\""":\"""Counter\""", \"""min\""":100}, {name:\"""Engine\""", values: [\"""on\""", \"""off\"""]}]" -e DeviceCount=1 -e MessageCount=3 mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator:latest
+docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=iothubowner;SharedAccessKey=your-iothub-key" -e Template="{ \"""deviceId\""": \"""$.DeviceId\""", \"""temp\""": $.Temp, \"""Ticks\""": $.Ticks, \"""Counter\""": $.Counter, \"""time\""": \"""$.Time\""", \"""engine\""": \"""$.Engine\""" }" -e Variables="[{name: \"""Temp\""", \"""random\""": true, \"""max\""": 25, \"""min\""": 23}, {\"""name\""":\"""Counter\""", \"""min\""":100}, {name:\"""Engine\""", values: [\"""on\""", \"""off\"""]}]" -e DeviceCount=1 -e MessageCount=3 mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator
 ```
 
 #### Example 2: Adding the engine status ("on" or "off") to the telemetry
@@ -158,7 +162,60 @@ Output:
 Running with Docker:
 
 ```bash
-docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" -e Template="{ \"deviceId\": \"$.DeviceId\", \"temp\": $.Temp, \"Ticks\": $.Ticks, \"Counter\": $.Counter, \"time\": \"$.Time\", \"engine\": \"$.Engine\" }" -e Variables="[{name: \"Temp\", \"random\": true, \"max\": 25, \"min\": 23}, {\"name\":\"Counter\", \"min\":100}, {name:\"Engine\", values: [\"on\", \"off\"]}]" mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator:latest
+docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" -e Template="{ \"deviceId\": \"$.DeviceId\", \"temp\": $.Temp, \"Ticks\": $.Ticks, \"Counter\": $.Counter, \"time\": \"$.Time\", \"engine\": \"$.Engine\" }" -e Variables="[{name: \"Temp\", \"random\": true, \"max\": 25, \"min\": 23}, {\"name\":\"Counter\", \"min\":100}, {name:\"Engine\", values: [\"on\", \"off\"]}]" mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator
+```
+
+#### Example 3: Using a configuration file to customize simulation
+
+```bash
+docker run -it -e "IotHubConnectionString=HostName=your-iothub-name.azure-devices.net;SharedAccessKeyName=device;SharedAccessKey=your-iothub-key" -e "File=/config_files/test4-config-multiple-internals-per-device.json" -e DeviceCount=3 --mount type=bind,source=$pwd\test\IotTelemetrySimulator.Test\test_files,target=/config_files,readonly mcr.microsoft.com/oss/azure-samples/azureiot-telemetrysimulator
+```
+
+Where the file content is:
+
+```plain
+{
+  "Variables": [
+    {
+      "name": "DeviceSequenceValue1",
+      "sequence": true,
+      "values": [ "$.Counter", "$.Counter", "$.Counter", "$.Counter", "$.Counter", "true", "false", "$.Counter" ]
+    },
+    {
+      "name": "Device1Tags",
+      "sequence": true,
+      "values": [ "['ProducedPartCount']", "['ProducedPartCount']", "['ProducedPartCount']", "['ProducedPartCount']", "['ProducedPartCount']", "['Downtime']", "['Downtime']", "['ProducedPartCount']" ]
+    },
+    {
+      "name": "Device1Downtime",
+      "values": [ "true", "true", "true", "true", "false" ]
+    },
+    {
+      "name": "Counter"
+    }
+  ],
+  "Intervals": {
+    "sim000001": 10000,
+    "sim000002": 100
+  },
+  "Payloads": [
+    {
+      "type": "template",
+      "deviceId": "sim000001",
+      "template": "{\"device\":\"$.DeviceId\",\"value\":\"$.DeviceSequenceValue1\",\"tags\": $.Device1Tags}"
+    },
+    {
+      "type": "fix",
+      "deviceId": "sim000002",
+      "value": "{\"value\":\"myfixvalue\"}"
+    },
+    {
+      "type": "template",
+      "deviceId": "sim000003",
+      "template": "{\"device\":\"$.DeviceId\",\"a\":\"b\",\"value\":\"$.DeviceSequenceValue1\"}"
+    }
+  ]
+}
 ```
 
 ## Generating high volume of telemetry

src/IotTelemetrySimulator/Constants.cs

@@ -14,10 +14,11 @@ public static class Constants
         public const string DeviceIdValueName = "DeviceId";
         public const string GuidValueName = "Guid";
         public const string MachineNameValueName = "MachineName";
+        public const string IterationNumberValueName = "IterationNumber";
         public static readonly string[] AllSpecialValueNames =
         {
             TimeValueName, LocalTimeValueName, EpochValueName, TicksValueName,
-            DeviceIdValueName, GuidValueName, MachineNameValueName,
+            DeviceIdValueName, GuidValueName, MachineNameValueName, IterationNumberValueName
         };
     }
 }

src/IotTelemetrySimulator/FixPayload.cs

@@ -7,7 +7,12 @@ public class FixPayload : PayloadBase
         public byte[] Payload { get; }
 
         public FixPayload(int distribution, byte[] payload)
-            : base(distribution)
+            : this(distribution, null, payload)
+        {
+        }
+
+        public FixPayload(int distribution, string deviceId, byte[] payload)
+            : base(distribution, deviceId)
         {
             this.Payload = payload;
         }

src/IotTelemetrySimulator/IotHubSender.cs

@@ -11,7 +11,7 @@ internal class IotHubSender : SenderBase<Message>
         const string ApplicationJsonContentType = "application/json";
         const string Utf8Encoding = "utf-8";
 
-        private DeviceClient deviceClient;
+        private readonly DeviceClient deviceClient;
 
         public IotHubSender(DeviceClient deviceClient, string deviceId, RunnerConfiguration config)
             : base(deviceId, config)

src/IotTelemetrySimulator/PayloadBase.cs

@@ -7,12 +7,20 @@ public abstract class PayloadBase
     {
         public int Distribution { get; set; }
 
-        public PayloadBase(int distribution)
+        public string DeviceId { get; set; }
+
+        protected PayloadBase(int distribution)
+            : this(distribution, null)
+        {
+        }
+
+        protected PayloadBase(int distribution, string deviceId)
         {
             if (distribution < 1 || distribution > 100)
                 throw new ArgumentOutOfRangeException(nameof(distribution), "Distribution must be between 1 and 100");
 
             this.Distribution = distribution;
+            this.DeviceId = deviceId;
         }
 
         public abstract (byte[], Dictionary<string, object>) Generate(Dictionary<string, object> variableValues);

src/IotTelemetrySimulator/PayloadGenerator.cs

@@ -10,6 +10,8 @@ public class PayloadGenerator
 
         public PayloadBase[] Payloads { get; }
 
+        private readonly Dictionary<string, PayloadBase> payloadsPerDevice;
+
         public PayloadGenerator(IEnumerable<PayloadBase> payloads, IRandomizer randomizer)
         {
             this.randomizer = randomizer ?? throw new ArgumentNullException(nameof(randomizer));
@@ -19,13 +21,19 @@ public PayloadGenerator(IEnumerable<PayloadBase> payloads, IRandomizer randomize
             }
 
             this.Payloads = payloads.OrderByDescending(x => x.Distribution).ToArray();
+            this.payloadsPerDevice = this.Payloads
+                .Where(x => !string.IsNullOrEmpty(x.DeviceId))
+                .ToDictionary(x => x.DeviceId);
         }
 
-        public (byte[], Dictionary<string, object>) Generate(Dictionary<string, object> variableValues)
+        public (byte[], Dictionary<string, object>) Generate(string deviceId, Dictionary<string, object> variableValues)
         {
             if (this.Payloads.Length == 1)
                 return this.Payloads[0].Generate(variableValues);
 
+            if (deviceId != null && this.payloadsPerDevice.TryGetValue(deviceId, out var payloadForDevice))
+                return payloadForDevice.Generate(variableValues);
+
             var random = this.randomizer.Next(1, 101);
             var currentPercentage = 0;
             foreach (var payload in this.Payloads)

src/IotTelemetrySimulator/Program.cs

@@ -1,11 +1,7 @@
 namespace IotTelemetrySimulator
 {
     using System;
-    using System.Collections.Generic;
-    using System.Diagnostics;
-    using System.Linq;
-    using System.Threading;
-    using System.Threading.Tasks;
+    using Microsoft.Extensions.Configuration;
     using Microsoft.Extensions.DependencyInjection;
     using Microsoft.Extensions.Hosting;
 
@@ -22,6 +18,20 @@ public static IHostBuilder CreateHostBuilder(string[] args)
 #if DEBUG
                 .UseEnvironment("Development")
 #endif
+                .ConfigureAppConfiguration(builder =>
+                {
+                    var tempConfig = builder.Build();
+                    var fileConfig = tempConfig["File"];
+                    if (!string.IsNullOrEmpty(fileConfig))
+                    {
+                        builder.AddJsonFile(fileConfig, optional: false, reloadOnChange: false);
+                    }
+
+                    if (tempConfig is IDisposable diposableConfig)
+                    {
+                        diposableConfig.Dispose();
+                    }
+                })
                 .ConfigureServices((hostContext, services) =>
                 {
                     services.AddSingleton<IDeviceSimulatorFactory, DefaultDeviceSimulatorFactory>();