Anuraj

Create Azure Functions with GraphQL Support

December 05, 2021 by Anuraj

DotNetCore GraphQL Serverless Azure Azure Functions

This post is about creating .NET Core Azure Functions with GraphQL Support. For supporting GraphQL we are using the HotChocolate package. First we need create an Azure Function using the func init GraphQL-Azure-Function --dotnet command. Or if you’re using VSCode create a function with dotnet runtime and HTTP Trigger. Next we need to add the HotChocolate.AzureFunctions package - which will help you to configure the Azure Function with GraphQL attribute. Here is the code for the Azure Function.

public class HttpExample
{
    [FunctionName("HttpExample")]
    public async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "graphql")] HttpRequest req,
        [GraphQL] IGraphQLRequestExecutor executor, 
        ILogger log)
    {
        log.LogInformation("C# HTTP trigger function processed a request.");

        return await executor.ExecuteAsync(req);
    }
}

Next we need to configure the startup class for the Azure Function so that the IGraphQLRequestExecutor instance can be injected to the Run method. We need to add reference of Microsoft.Azure.Functions.Extensions package. I already a wrote a blog post on How to add startup class for an Azure Function. Once we added the package, create a class Startup and add the following code.

[assembly: FunctionsStartup(typeof(Startup))]
namespace Company.Function
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.AddGraphQLFunction().AddQueryType<Query>();
        }
    }
}

And finally we need to implement the Query class, here is the implementation.

public class Query
{
    public IQueryable<Link> Links => new List<Link>
    {
        new Link
        {
            Id = 1,
            Url = "https://example.com",
            Title = "Example",
            Description = "This is an example link",
            ImageUrl = "https://example.com/image.png",
            Tags = new List<Tag> { new Tag(){ Name = "Example" } },
            CreatedOn = DateTime.Now
        },
        new Link
        {
            Id = 2,
            Url = "https://dotnetthoughts.net",
            Title = "DotnetThoughts",
            Description = "DotnetThoughts is a blog about .NET",
            ImageUrl = "https://dotnetthoughts.net/image.png",
            Tags = new List<Tag>
            {
                new Tag(){ Name = "Programming" },
                new Tag(){ Name = "Blog" },
                new Tag(){ Name = "dotnet" }
            },
            CreatedOn = DateTime.Now
        },
    }.AsQueryable();
}

public class Link
{
    public int Id { get; set; }
    public string Url { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public string ImageUrl { get; set; }
    public DateTime CreatedOn { get; set; }
    public ICollection<Tag> Tags { get; set; } = new List<Tag>();
}

public class Tag
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int LinkId { get; set; }
    public Link Link { get; set; }
}

Now we completed the implementation. Lets run the function using func start command. You will see a page like this once you browse the http://localhost:7071/api/graphql URL.

Graph QL endpoint - Azure Functions

This way we will be able to implement GraphQL in Azure Functions. It is a new feature in HotChocolate package which offers out of the box support for Azure Functions. And if you install HotChocolate templates, you can install them using dotnet new -i HotChocolate.Templates command and you can create an Azure Function with GraphQL support with this dotnet new graphql-azf command.

You can find the source code in GitHub

Happy Programming :)

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