Migrating Azure Functions sample to isolated worker model

samples/azure/azure-function/Dockerfile

@@ -1,10 +1,10 @@
 # Find the Dockerfile at this URL
 # https://github.com/Azure/azure-functions-docker/blob/dev/host/4/bullseye/amd64/dotnet/dotnet-inproc/dotnet.Dockerfile
 
-FROM mcr.microsoft.com/azure-functions/dotnet:4.0 AS base
+FROM mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0 AS base
 WORKDIR /home/site/wwwroot
 
-FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
 COPY ["src/", "data/src/"]
 COPY ["scripts/", "data/scripts/"]
 COPY ["samples/", "data/samples/"]
@@ -21,3 +21,4 @@ RUN dotnet publish "samples/azure/azure-function/function.csproj" -c Release -o
 FROM base AS final
 WORKDIR /home/site/wwwroot
 COPY --from=publish /app/publish .
+ENV ASPNETCORE_CONTENTROOT=/home/site/wwwroot

samples/azure/azure-function/GetCarbonIntensity.cs

@@ -1,7 +1,7 @@
 using GSF.CarbonAware.Handlers;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.Azure.WebJobs;
-using Microsoft.Azure.WebJobs.Extensions.Http;
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.Azure.Functions.Worker.Http;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Logging;
 using System;
@@ -14,17 +14,18 @@ namespace function
     public class GetCarbonIntensity
     {
         private readonly IEmissionsHandler _handler;
+        private readonly ILogger<GetCarbonIntensity> _log;
 
-        public GetCarbonIntensity(IEmissionsHandler handler)
+        public GetCarbonIntensity(IEmissionsHandler handler, ILogger<GetCarbonIntensity> log)
         {
             this._handler = handler;
+            this._log = log;
         }
 
 
-        [FunctionName("GetAverageCarbonIntensity")]
+        [Function("GetAverageCarbonIntensity")]
         public async Task<IActionResult> Run(
-            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
-            ILogger log)
+            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req)
         {
             //Get the startDate, endDate, and location from the request query if the values are present in the query
             string startDate = req.Query["startdate"];
@@ -47,7 +48,7 @@ public async Task<IActionResult> Run(
             try
             {
                 var result = await _handler.GetAverageCarbonIntensityAsync(location, DateTimeOffset.Parse(startDate), DateTimeOffset.Parse(endDate));
-                log.LogInformation($"For location {location} Starting at: {startDate} Ending at: {endDate} the Average Emissions Rating is: {result}.");
+                _log.LogInformation($"For location {location} Starting at: {startDate} Ending at: {endDate} the Average Emissions Rating is: {result}.");
 
                 return new OkObjectResult(result);
             }

samples/azure/azure-function/GetForecast.cs

@@ -1,7 +1,7 @@
 using GSF.CarbonAware.Handlers;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.Azure.WebJobs;
-using Microsoft.Azure.WebJobs.Extensions.Http;
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.Azure.Functions.Worker.Http;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Logging;
 using System;
@@ -15,16 +15,17 @@ namespace CarbonAwareFunctions
     public class GetForecast
     {
         private readonly IForecastHandler _handler;
+        private readonly ILogger<GetForecast> _log;
 
-        public GetForecast(IForecastHandler handler)
+        public GetForecast(IForecastHandler handler, ILogger<GetForecast> log)
         {
             this._handler = handler;
+            this._log = log;
         }
 
-        [FunctionName("GetCurrentForecast")]
+        [Function("GetCurrentForecast")]
         public async Task<IActionResult> Run(
-            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
-            ILogger log)
+            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req)
         {
             //Get the startDate, endDate, location, and duration from the request query if the values are present in the query
             string startDate = req.Query["startdate"];

samples/azure/azure-function/Program.cs

@@ -0,0 +1,24 @@
+using GSF.CarbonAware.Configuration;
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Configuration;
+using System.IO;
+
+var host = new HostBuilder()
+    .ConfigureFunctionsWebApplication()
+    .ConfigureAppConfiguration((context, builder) => {
+        var env = context.HostingEnvironment;
+        builder.AddJsonFile(Path.Combine(env.ContentRootPath, "appsettings.json"), optional: true, reloadOnChange: false)
+               .AddJsonFile(Path.Combine(env.ContentRootPath, $"appsettings.{env.EnvironmentName}.json"), optional: true, reloadOnChange: false)
+               .AddEnvironmentVariables();
+    })
+    .ConfigureServices((context,services) => {
+        services.AddApplicationInsightsTelemetryWorkerService();
+        services.ConfigureFunctionsApplicationInsights();
+        services.AddEmissionsServices(context.Configuration);
+        services.AddForecastServices(context.Configuration);
+    })
+    .Build();
+
+host.Run();

samples/azure/azure-function/README.md

@@ -19,29 +19,20 @@ will use.
 
 The Carbon Aware SDK is included in the function .csproj file by
 [creating and adding the SDK as a package](../../docs/packaging.md#included-scripts).
-The [Startup.cs](./Startup.cs) file uses dependency injection to access the
+The [Program.cs](./Program.cs) file uses dependency injection to access the
 handlers in the library. The following code initializes the C# Library:
 
 ```C#
- public override void Configure(IFunctionsHostBuilder builder)
-        {
-            var configuration = builder.GetContext().Configuration;
-            builder.Services
-            .AddEmissionsServices(configuration)
-            .AddForecastServices(configuration);
-        }
+    // omitted
+    .ConfigureServices((context,services) => {
+        services.AddApplicationInsightsTelemetryWorkerService();
+        services.ConfigureFunctionsApplicationInsights();
+        services.AddEmissionsServices(context.Configuration);
+        services.AddForecastServices(context.Configuration);
+    })
+    // omitted
 ```
 
-> Note as the in-process
-> [Azure Function uses dependency injection](https://learn.microsoft.com/en-us/azure/azure-functions/functions-dotnet-dependency-injection)
-> though via
-> [Microsoft.Azure.Functions.Extensions](https://www.nuget.org/packages/Microsoft.Azure.Functions.Extensions/)
-> there is a version conflict of
-> [Microsoft.Extensions.Configuration](https://www.nuget.org/packages/Microsoft.Extensions.Configuration).
-> It is fixed adding a version specific project dependency (in .csproj) to the
-> same version as the Carbon Aware SDK. Microsoft.Extensions.Configuration is
-> backwards compatible.
-
 ## Run Function Locally
 
 Both Azure Function apps can be

samples/azure/azure-function/function.csproj

@@ -1,18 +1,23 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AzureFunctionsVersion>v4</AzureFunctionsVersion>
+    <OutputType>Exe</OutputType>
   </PropertyGroup>
   <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.19.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.16.2" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="1.0.0" />
+    <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.21.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="6.0.1" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="6.0.1" />
     <PackageReference Include="Microsoft.Net.Http.Headers" Version="2.2.8" />
     <PackageReference Include="System.ComponentModel.Composition" Version="6.0.0" />
     <PackageReference Include="WireMock.Net" Version="1.5.6" />
-    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
-    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.0.1" />
   </ItemGroup>
   <ItemGroup>
     <None Update="host.json">
@@ -26,4 +31,7 @@
     <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>      
 </None>
   </ItemGroup>
+  <ItemGroup>
+    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext"/>
+  </ItemGroup>
 </Project>