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Custom resource cache reference

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This article will go through the requirements for endpoints implementing cache custom resources. If you're unfamiliar with Azure Custom Resource Providers, see the overview on custom resource providers.

Define a cache resource endpoint

A proxy resource can be created by specifying the routingType to "Proxy, Cache".

Sample custom resource provider:

{
  "properties": {
    "resourceTypes": [
      {
        "name": "myCustomResources",
        "routingType": "Proxy, Cache",
        "endpoint": "https://{endpointURL}/"
      }
    ]
  },
  "location": "eastus",
  "type": "Microsoft.CustomProviders/resourceProviders",
  "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}",
  "name": "{resourceProviderName}"
}

Build a proxy resource endpoint

An endpoint that implements a "Proxy, Cache" resource endpoint must handle the request and response for the new API in Azure. In this case, the resourceType will generate a new Azure resource API for PUT, GET, and DELETE to perform CRUD on a single resource, as well as GET to retrieve all existing resources.

Note

The Azure API will generate the request methods PUT, GET, and DELETE, but the cache endpoint only needs to handle PUT and DELETE. We recommended that the endpoint also implements GET.

Create a custom resource

Azure API incoming request:

PUT https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}?api-version=2018-09-01-preview
Authorization: Bearer eyJ0e...
Content-Type: application/json

{
    "properties": {
        "myProperty1": "myPropertyValue1",
        "myProperty2": {
            "myProperty3" : "myPropertyValue3"
        }
    }
}

This request will then be forwarded to the endpoint in the form:

PUT https://{endpointURL}/?api-version=2018-09-01-preview
Content-Type: application/json
X-MS-CustomProviders-RequestPath: /subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}

{
    "properties": {
        "myProperty1": "myPropertyValue1",
        "myProperty2": {
            "myProperty3" : "myPropertyValue3"
        }
    }
}

The response from the endpoint is then forwarded back to the customer. The response should return:

  • A valid JSON object document. All arrays and strings should be nested under a top object.
  • The Content-Type header should be set to "application/json; charset=utf-8".
  • The custom resource provider will overwrite the name, type, and id fields for the request.
  • The custom resource provider will only return fields under the properties object for a cache endpoint.

Endpoint response:

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{
    "properties": {
        "myProperty1": "myPropertyValue1",
        "myProperty2": {
            "myProperty3" : "myPropertyValue3"
        }
    }
}

The name, id, and type fields will automatically be generated for the custom resource by the custom resource provider.

Azure Custom Resource Provider response:

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{
    "name": "{myCustomResourceName}",
    "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}",
    "type": "Microsoft.CustomProviders/resourceProviders/myCustomResources",
    "properties": {
        "myProperty1": "myPropertyValue1",
        "myProperty2": {
            "myProperty3" : "myPropertyValue3"
        }
    }
}

Remove a custom resource

Azure API incoming request:

Delete https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}?api-version=2018-09-01-preview
Authorization: Bearer eyJ0e...
Content-Type: application/json

This request will then be forwarded to the endpoint in the form:

Delete https://{endpointURL}/?api-version=2018-09-01-preview
Content-Type: application/json
X-MS-CustomProviders-RequestPath: /subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}

The response from the endpoint is then forwarded back to the customer. The response should return:

  • A valid JSON object document. All arrays and strings should be nested under a top object.
  • The Content-Type header should be set to "application/json; charset=utf-8".
  • The Azure Custom Resource Provider will only remove the item from its cache if a 200-level response is returned. Even if the resource doesn't exist, the endpoint should return 204.

Endpoint response:

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

Azure Custom Resource Provider response:

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

Retrieve a custom resource

Azure API incoming request:

GET https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}?api-version=2018-09-01-preview
Authorization: Bearer eyJ0e...
Content-Type: application/json

The request will not be forwarded to the endpoint.

Azure Custom Resource Provider response:

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{
    "name": "{myCustomResourceName}",
    "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}",
    "type": "Microsoft.CustomProviders/resourceProviders/myCustomResources",
    "properties": {
        "myProperty1": "myPropertyValue1",
        "myProperty2": {
            "myProperty3" : "myPropertyValue3"
        }
    }
}

Enumerate all custom resources

Azure API incoming request:

GET https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources?api-version=2018-09-01-preview
Authorization: Bearer eyJ0e...
Content-Type: application/json

The request will not be forwarded to the endpoint.

Azure Custom Resource Provider response:

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{
    "value" : [
        {
            "name": "{myCustomResourceName}",
            "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}/myCustomResources/{myCustomResourceName}",
            "type": "Microsoft.CustomProviders/resourceProviders/myCustomResources",
            "properties": {
                "myProperty1": "myPropertyValue1",
                "myProperty2": {
                    "myProperty3" : "myPropertyValue3"
                }
            }
        }
    ]
}

Next steps