public static async Task Run()

in quickstarts/microsoft.customproviders/custom-rp-with-function/src/HttpTrigger1/run.csx [34:95]
44 lines of code
12 McCabe index (conditional complexity)

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, ILogger log, CloudTable tableStorage)
{
    // Get the unique Azure request path from request headers.
    var requestPath = req.Headers.GetValues("x-ms-customproviders-requestpath").First();

    log.LogInformation($"The Custom Provider Function received a request '{req.Method}' for resource '{requestPath}'.");

    // Determines if it is a collection level call or action.
    var isResourceRequest = requestPath.Split('/').Length % 2 == 1;
    var azureResourceId = isResourceRequest ? 
        ResourceId.FromString(requestPath) :
        ResourceId.FromString($"{requestPath}/");

    // Create the Partition Key and Row Key
    var partitionKey = $"{azureResourceId.SubscriptionId}:{azureResourceId.ResourceGroupName}:{azureResourceId.Parent.Name}";
    var rowKey = $"{azureResourceId.FullResourceType.Replace('/', ':')}:{azureResourceId.Name}";

    switch (req.Method)
    {
        // Action request for an custom action.
        case HttpMethod m when m == HttpMethod.Post && !isResourceRequest:
            return await TriggerCustomAction(
                requestMessage: req);

        // Enumerate request for all custom resources.
        case HttpMethod m when m == HttpMethod.Get && !isResourceRequest:
            return await EnumerateAllCustomResources(
                requestMessage: req,
                tableStorage: tableStorage,
                partitionKey: partitionKey,
                resourceType: rowKey);

        // Retrieve request for a custom resource.
        case HttpMethod m when m == HttpMethod.Get && isResourceRequest:
            return await RetrieveCustomResource(
                requestMessage: req,
                tableStorage: tableStorage,
                partitionKey: partitionKey,
                rowKey: rowKey);

        // Create request for a custom resource.
        case HttpMethod m when m == HttpMethod.Put && isResourceRequest:
            return await CreateCustomResource(
                requestMessage: req,
                tableStorage: tableStorage,
                azureResourceId: azureResourceId,
                partitionKey: partitionKey,
                rowKey: rowKey);

        // Remove request for a custom resource.
        case HttpMethod m when m == HttpMethod.Delete && isResourceRequest:
            return await RemoveCustomResource(
                requestMessage: req,
                tableStorage: tableStorage,
                partitionKey: partitionKey,
                rowKey: rowKey);

        // Invalid request recieved.
        default:
            return req.CreateResponse(HttpStatusCode.BadRequest);
    }
}