Referenz zum benutzerdefinierten C# RESTful-Endpunkt eines Ressourcenanbieters

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Dieser Artikel stellt eine grundlegende Referenz zum benutzerdefinierten C# RESTful-Endpunkt eines Ressourcenanbieters dar. Wenn Sie mit benutzerdefinierten Azure-Ressourcenanbietern nicht vertraut sind, siehe die Übersicht über benutzerdefinierte Ressourcenanbieter.

RESTful-Endpunkt für Azure Functions

Der folgende Code funktioniert mit einer Funktions-App in Azure. Weitere Informationen zum Einrichten einer Funktions-App für die Arbeit mit benutzerdefinierten Azure-Ressourcenanbietern finden Sie im Tutorial zum Einrichten von Azure Functions für benutzerdefinierte Azure-Ressourcenanbieter.

#r "Newtonsoft.Json"
#r "Microsoft.WindowsAzure.Storage"
#r "../bin/Microsoft.Azure.Management.ResourceManager.Fluent"

using System;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Configuration;
using System.Text;
using System.Threading;
using System.Globalization;
using System.Collections.Generic;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.WindowsAzure.Storage.Table;
using Microsoft.Azure.Management.ResourceManager.Fluent.Core;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

// Custom Resource Table Entity
public class CustomResource : TableEntity
{
    public string Data { get; set; }
}

/// <summary>
/// Entry point for the Azure Function webhook that acts as the service behind a custom resource provider.
/// </summary>
/// <param name="requestMessage">The HTTP request message.</param>
/// <param name="log">The logger.</param>
/// <param name="tableStorage">The Azure Table storage account.</param>
/// <returns>The HTTP response for the custom Azure API.</returns>
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").FirstOrDefault();

    if (requestPath == null)
    {
        var missingHeaderResponse = req.CreateResponse(HttpStatusCode.BadRequest);
        missingHeaderResponse.Content = new StringContent(
            new JObject(new JProperty("error", "missing 'x-ms-customproviders-requestpath' header")).ToString(),
            System.Text.Encoding.UTF8, 
            "application/json");
    }

    log.LogInformation($"The Custom Resource 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 a 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 received.
        default:
            return req.CreateResponse(HttpStatusCode.BadRequest);
    }
}

/// <summary>
/// Triggers a custom action with some side effects.
/// </summary>
/// <param name="requestMessage">The HTTP request message.</param>
/// <returns>The HTTP response result of the custom action.</returns>
public static async Task<HttpResponseMessage> TriggerCustomAction(HttpRequestMessage requestMessage)
{
    var myCustomActionRequest = await requestMessage.Content.ReadAsStringAsync();

    var actionResponse = requestMessage.CreateResponse(HttpStatusCode.OK);
    actionResponse.Content = myCustomActionRequest != string.Empty ? 
        new StringContent(JObject.Parse(myCustomActionRequest).ToString(), System.Text.Encoding.UTF8, "application/json") :
        null;
    return actionResponse;
}

/// <summary>
/// Enumerates all the stored custom resources for a given type.
/// </summary>
/// <param name="requestMessage">The HTTP request message.</param>
/// <param name="tableStorage">The Azure Table storage account.</param>
/// <param name="partitionKey">The partition key for storage. This is the custom resource provider ID.</param>
/// <param name="resourceType">The resource type of the enumeration.</param>
/// <returns>The HTTP response containing a list of resources stored under 'value'.</returns>
public static async Task<HttpResponseMessage> EnumerateAllCustomResources(HttpRequestMessage requestMessage, CloudTable tableStorage, string partitionKey, string resourceType)
{
    // Generate upper bound of the query.
    var rowKeyUpperBound = new StringBuilder(resourceType);
    rowKeyUpperBound[rowKeyUpperBound.Length - 1]++;

    // Create the enumeration query.
    var enumerationQuery = new TableQuery<CustomResource>().Where(
        TableQuery.CombineFilters(
            TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, partitionKey),
            TableOperators.And,
            TableQuery.CombineFilters(
                TableQuery.GenerateFilterCondition("RowKey", QueryComparisons.GreaterThan, resourceType),
                TableOperators.And,
                TableQuery.GenerateFilterCondition("RowKey", QueryComparisons.LessThan, rowKeyUpperBound.ToString()))));
    
    var customResources = (await tableStorage.ExecuteQuerySegmentedAsync(enumerationQuery, null))
        .ToList().Select(customResource => JToken.Parse(customResource.Data));

    var enumerationResponse = requestMessage.CreateResponse(HttpStatusCode.OK);
    enumerationResponse.Content = new StringContent(new JObject(new JProperty("value", customResources)).ToString(), System.Text.Encoding.UTF8, "application/json");
    return enumerationResponse;
}

/// <summary>
/// Retrieves a custom resource.
/// </summary>
/// <param name="requestMessage">The HTTP request message.</param>
/// <param name="tableStorage">The Azure Table storage account.</param>
/// <param name="partitionKey">The partition key for storage. This is the custom resource provider ID.</param>
/// <param name="rowKey">The row key for storage. This is '{resourceType}:{customResourceName}'.</param>
/// <returns>The HTTP response containing the existing custom resource.</returns>
public static async Task<HttpResponseMessage> RetrieveCustomResource(HttpRequestMessage requestMessage, CloudTable tableStorage, string partitionKey, string rowKey)
{
    // Attempt to retrieve the Existing Stored Value
    var tableQuery = TableOperation.Retrieve<CustomResource>(partitionKey, rowKey);
    var existingCustomResource = (CustomResource)(await tableStorage.ExecuteAsync(tableQuery)).Result;

    var retrieveResponse = requestMessage.CreateResponse(
        existingCustomResource != null ? HttpStatusCode.OK : HttpStatusCode.NotFound);

    retrieveResponse.Content = existingCustomResource != null ?
            new StringContent(existingCustomResource.Data, System.Text.Encoding.UTF8, "application/json"):
            null;
    return retrieveResponse;
}

/// <summary>
/// Creates a custom resource and saves it to Table storage.
/// </summary>
/// <param name="requestMessage">The HTTP request message.</param>
/// <param name="tableStorage">The Azure Table storage account.</param>
/// <param name="azureResourceId">The parsed Azure resource ID.</param>
/// <param name="partitionKey">The partition key for storage. This is the custom resource provider ID.</param>
/// <param name="rowKey">The row key for storage. This is '{resourceType}:{customResourceName}'.</param>
/// <returns>The HTTP response containing the created custom resource.</returns>
public static async Task<HttpResponseMessage> CreateCustomResource(HttpRequestMessage requestMessage, CloudTable tableStorage, ResourceId azureResourceId, string partitionKey, string rowKey)
{
    // Constructs the new resource from the request body and adds the Azure Resource Manager fields.
    var myCustomResource = JObject.Parse(await requestMessage.Content.ReadAsStringAsync());
    myCustomResource["name"] = azureResourceId.Name;
    myCustomResource["type"] = azureResourceId.FullResourceType;
    myCustomResource["id"] = azureResourceId.Id;

    // Save the resource into storage.
    var insertOperation = TableOperation.InsertOrReplace(
        new CustomResource
        {
            PartitionKey = partitionKey,
            RowKey = rowKey,
            Data = myCustomResource.ToString(),
        });
    await tableStorage.ExecuteAsync(insertOperation);

    var createResponse = requestMessage.CreateResponse(HttpStatusCode.OK);
    createResponse.Content = new StringContent(myCustomResource.ToString(), System.Text.Encoding.UTF8, "application/json");
    return createResponse;
}

/// <summary>
/// Removes an existing custom resource.
/// </summary>
/// <param name="requestMessage">The HTTP request message.</param>
/// <param name="tableStorage">The Azure Table storage account.</param>
/// <param name="partitionKey">The partition key for storage. This is the custom resource provider ID.</param>
/// <param name="rowKey">The row key for storage. This is '{resourceType}:{customResourceName}'.</param>
/// <returns>The HTTP response containing the result of the deletion.</returns>
public static async Task<HttpResponseMessage> RemoveCustomResource(HttpRequestMessage requestMessage, CloudTable tableStorage, string partitionKey, string rowKey)
{
    // Attempt to retrieve the existing stored value
    var tableQuery = TableOperation.Retrieve<CustomResource>(partitionKey, rowKey);
    var existingCustomResource = (CustomResource)(await tableStorage.ExecuteAsync(tableQuery)).Result;

    if (existingCustomResource != null) {
        var deleteOperation = TableOperation.Delete(existingCustomResource);
        await tableStorage.ExecuteAsync(deleteOperation);
    }

    return requestMessage.CreateResponse(
        existingCustomResource != null ? HttpStatusCode.OK : HttpStatusCode.NoContent);
}

Nächste Schritte