package compute

// Copyright (c) Microsoft and contributors.  All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Code generated by Microsoft (R) AutoRest Code Generator 1.0.1.0
// Changes may cause incorrect behavior and will be lost if the code is
// regenerated.

import (
	"github.com/Azure/go-autorest/autorest"
	"github.com/Azure/go-autorest/autorest/azure"
	"github.com/Azure/go-autorest/autorest/validation"
	"net/http"
)

// VirtualMachineScaleSetsClient is the the Compute Management Client.
type VirtualMachineScaleSetsClient struct {
	ManagementClient
}

// NewVirtualMachineScaleSetsClient creates an instance of the
// VirtualMachineScaleSetsClient client.
func NewVirtualMachineScaleSetsClient(subscriptionID string) VirtualMachineScaleSetsClient {
	return NewVirtualMachineScaleSetsClientWithBaseURI(DefaultBaseURI, subscriptionID)
}

// NewVirtualMachineScaleSetsClientWithBaseURI creates an instance of the
// VirtualMachineScaleSetsClient client.
func NewVirtualMachineScaleSetsClientWithBaseURI(baseURI string, subscriptionID string) VirtualMachineScaleSetsClient {
	return VirtualMachineScaleSetsClient{NewWithBaseURI(baseURI, subscriptionID)}
}

// CreateOrUpdate create or update a VM scale set. This method may poll for
// completion. Polling can be canceled by passing the cancel channel argument.
// The channel will be used to cancel polling and any outstanding HTTP
// requests.
//
// resourceGroupName is the name of the resource group. name is the name of the
// VM scale set to create or update. parameters is the scale set object.
func (client VirtualMachineScaleSetsClient) CreateOrUpdate(resourceGroupName string, name string, parameters VirtualMachineScaleSet, cancel <-chan struct{}) (<-chan VirtualMachineScaleSet, <-chan error) {
	resultChan := make(chan VirtualMachineScaleSet, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result VirtualMachineScaleSet
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.CreateOrUpdatePreparer(resourceGroupName, name, parameters, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "CreateOrUpdate", nil, "Failure preparing request")
			return
		}

		resp, err := client.CreateOrUpdateSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "CreateOrUpdate", resp, "Failure sending request")
			return
		}

		result, err = client.CreateOrUpdateResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "CreateOrUpdate", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// CreateOrUpdatePreparer prepares the CreateOrUpdate request.
func (client VirtualMachineScaleSetsClient) CreateOrUpdatePreparer(resourceGroupName string, name string, parameters VirtualMachineScaleSet, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"name":              autorest.Encode("path", name),
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPut(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{name}", pathParameters),
		autorest.WithJSON(parameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// CreateOrUpdateSender sends the CreateOrUpdate request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) CreateOrUpdateSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// CreateOrUpdateResponder handles the response to the CreateOrUpdate request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) CreateOrUpdateResponder(resp *http.Response) (result VirtualMachineScaleSet, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusCreated),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Deallocate deallocates specific virtual machines in a VM scale set. Shuts
// down the virtual machines and releases the compute resources. You are not
// billed for the compute resources that this virtual machine scale set
// deallocates. This method may poll for completion. Polling can be canceled by
// passing the cancel channel argument. The channel will be used to cancel
// polling and any outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set. VMInstanceIDs is a list of virtual machine
// instance IDs from the VM scale set.
func (client VirtualMachineScaleSetsClient) Deallocate(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.DeallocatePreparer(resourceGroupName, VMScaleSetName, VMInstanceIDs, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Deallocate", nil, "Failure preparing request")
			return
		}

		resp, err := client.DeallocateSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Deallocate", resp, "Failure sending request")
			return
		}

		result, err = client.DeallocateResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Deallocate", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// DeallocatePreparer prepares the Deallocate request.
func (client VirtualMachineScaleSetsClient) DeallocatePreparer(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/deallocate", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	if VMInstanceIDs != nil {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithJSON(VMInstanceIDs))
	}
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// DeallocateSender sends the Deallocate request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) DeallocateSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// DeallocateResponder handles the response to the Deallocate request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) DeallocateResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Delete deletes a VM scale set. This method may poll for completion. Polling
// can be canceled by passing the cancel channel argument. The channel will be
// used to cancel polling and any outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set.
func (client VirtualMachineScaleSetsClient) Delete(resourceGroupName string, VMScaleSetName string, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.DeletePreparer(resourceGroupName, VMScaleSetName, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Delete", nil, "Failure preparing request")
			return
		}

		resp, err := client.DeleteSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Delete", resp, "Failure sending request")
			return
		}

		result, err = client.DeleteResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Delete", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// DeletePreparer prepares the Delete request.
func (client VirtualMachineScaleSetsClient) DeletePreparer(resourceGroupName string, VMScaleSetName string, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsDelete(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// DeleteSender sends the Delete request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) DeleteSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// DeleteResponder handles the response to the Delete request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) DeleteResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted, http.StatusNoContent),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// DeleteInstances deletes virtual machines in a VM scale set. This method may
// poll for completion. Polling can be canceled by passing the cancel channel
// argument. The channel will be used to cancel polling and any outstanding
// HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set. VMInstanceIDs is a list of virtual machine
// instance IDs from the VM scale set.
func (client VirtualMachineScaleSetsClient) DeleteInstances(resourceGroupName string, VMScaleSetName string, VMInstanceIDs VirtualMachineScaleSetVMInstanceRequiredIDs, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	if err := validation.Validate([]validation.Validation{
		{TargetValue: VMInstanceIDs,
			Constraints: []validation.Constraint{{Target: "VMInstanceIDs.InstanceIds", Name: validation.Null, Rule: true, Chain: nil}}}}); err != nil {
		errChan <- validation.NewErrorWithValidationError(err, "compute.VirtualMachineScaleSetsClient", "DeleteInstances")
		close(errChan)
		close(resultChan)
		return resultChan, errChan
	}

	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.DeleteInstancesPreparer(resourceGroupName, VMScaleSetName, VMInstanceIDs, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "DeleteInstances", nil, "Failure preparing request")
			return
		}

		resp, err := client.DeleteInstancesSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "DeleteInstances", resp, "Failure sending request")
			return
		}

		result, err = client.DeleteInstancesResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "DeleteInstances", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// DeleteInstancesPreparer prepares the DeleteInstances request.
func (client VirtualMachineScaleSetsClient) DeleteInstancesPreparer(resourceGroupName string, VMScaleSetName string, VMInstanceIDs VirtualMachineScaleSetVMInstanceRequiredIDs, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/delete", pathParameters),
		autorest.WithJSON(VMInstanceIDs),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// DeleteInstancesSender sends the DeleteInstances request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) DeleteInstancesSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// DeleteInstancesResponder handles the response to the DeleteInstances request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) DeleteInstancesResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Get display information about a virtual machine scale set.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set.
func (client VirtualMachineScaleSetsClient) Get(resourceGroupName string, VMScaleSetName string) (result VirtualMachineScaleSet, err error) {
	req, err := client.GetPreparer(resourceGroupName, VMScaleSetName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Get", nil, "Failure preparing request")
		return
	}

	resp, err := client.GetSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Get", resp, "Failure sending request")
		return
	}

	result, err = client.GetResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Get", resp, "Failure responding to request")
	}

	return
}

// GetPreparer prepares the Get request.
func (client VirtualMachineScaleSetsClient) GetPreparer(resourceGroupName string, VMScaleSetName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{})
}

// GetSender sends the Get request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) GetSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client, req)
}

// GetResponder handles the response to the Get request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) GetResponder(resp *http.Response) (result VirtualMachineScaleSet, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// GetInstanceView gets the status of a VM scale set instance.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set.
func (client VirtualMachineScaleSetsClient) GetInstanceView(resourceGroupName string, VMScaleSetName string) (result VirtualMachineScaleSetInstanceView, err error) {
	req, err := client.GetInstanceViewPreparer(resourceGroupName, VMScaleSetName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "GetInstanceView", nil, "Failure preparing request")
		return
	}

	resp, err := client.GetInstanceViewSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "GetInstanceView", resp, "Failure sending request")
		return
	}

	result, err = client.GetInstanceViewResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "GetInstanceView", resp, "Failure responding to request")
	}

	return
}

// GetInstanceViewPreparer prepares the GetInstanceView request.
func (client VirtualMachineScaleSetsClient) GetInstanceViewPreparer(resourceGroupName string, VMScaleSetName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/instanceView", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{})
}

// GetInstanceViewSender sends the GetInstanceView request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) GetInstanceViewSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client, req)
}

// GetInstanceViewResponder handles the response to the GetInstanceView request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) GetInstanceViewResponder(resp *http.Response) (result VirtualMachineScaleSetInstanceView, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// List gets a list of all VM scale sets under a resource group.
//
// resourceGroupName is the name of the resource group.
func (client VirtualMachineScaleSetsClient) List(resourceGroupName string) (result VirtualMachineScaleSetListResult, err error) {
	req, err := client.ListPreparer(resourceGroupName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "List", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "List", resp, "Failure sending request")
		return
	}

	result, err = client.ListResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "List", resp, "Failure responding to request")
	}

	return
}

// ListPreparer prepares the List request.
func (client VirtualMachineScaleSetsClient) ListPreparer(resourceGroupName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{})
}

// ListSender sends the List request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) ListSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client, req)
}

// ListResponder handles the response to the List request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) ListResponder(resp *http.Response) (result VirtualMachineScaleSetListResult, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// ListNextResults retrieves the next set of results, if any.
func (client VirtualMachineScaleSetsClient) ListNextResults(lastResults VirtualMachineScaleSetListResult) (result VirtualMachineScaleSetListResult, err error) {
	req, err := lastResults.VirtualMachineScaleSetListResultPreparer()
	if err != nil {
		return result, autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "List", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}

	resp, err := client.ListSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "List", resp, "Failure sending next results request")
	}

	result, err = client.ListResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "List", resp, "Failure responding to next results request")
	}

	return
}

// ListAll gets a list of all VM Scale Sets in the subscription, regardless of
// the associated resource group. Use nextLink property in the response to get
// the next page of VM Scale Sets. Do this till nextLink is not null to fetch
// all the VM Scale Sets.
func (client VirtualMachineScaleSetsClient) ListAll() (result VirtualMachineScaleSetListWithLinkResult, err error) {
	req, err := client.ListAllPreparer()
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListAll", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListAllSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListAll", resp, "Failure sending request")
		return
	}

	result, err = client.ListAllResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListAll", resp, "Failure responding to request")
	}

	return
}

// ListAllPreparer prepares the ListAll request.
func (client VirtualMachineScaleSetsClient) ListAllPreparer() (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"subscriptionId": autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/providers/Microsoft.Compute/virtualMachineScaleSets", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{})
}

// ListAllSender sends the ListAll request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) ListAllSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client, req)
}

// ListAllResponder handles the response to the ListAll request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) ListAllResponder(resp *http.Response) (result VirtualMachineScaleSetListWithLinkResult, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// ListAllNextResults retrieves the next set of results, if any.
func (client VirtualMachineScaleSetsClient) ListAllNextResults(lastResults VirtualMachineScaleSetListWithLinkResult) (result VirtualMachineScaleSetListWithLinkResult, err error) {
	req, err := lastResults.VirtualMachineScaleSetListWithLinkResultPreparer()
	if err != nil {
		return result, autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListAll", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}

	resp, err := client.ListAllSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListAll", resp, "Failure sending next results request")
	}

	result, err = client.ListAllResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListAll", resp, "Failure responding to next results request")
	}

	return
}

// ListSkus gets a list of SKUs available for your VM scale set, including the
// minimum and maximum VM instances allowed for each SKU.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set.
func (client VirtualMachineScaleSetsClient) ListSkus(resourceGroupName string, VMScaleSetName string) (result VirtualMachineScaleSetListSkusResult, err error) {
	req, err := client.ListSkusPreparer(resourceGroupName, VMScaleSetName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListSkus", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListSkusSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListSkus", resp, "Failure sending request")
		return
	}

	result, err = client.ListSkusResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListSkus", resp, "Failure responding to request")
	}

	return
}

// ListSkusPreparer prepares the ListSkus request.
func (client VirtualMachineScaleSetsClient) ListSkusPreparer(resourceGroupName string, VMScaleSetName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/skus", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{})
}

// ListSkusSender sends the ListSkus request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) ListSkusSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client, req)
}

// ListSkusResponder handles the response to the ListSkus request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) ListSkusResponder(resp *http.Response) (result VirtualMachineScaleSetListSkusResult, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// ListSkusNextResults retrieves the next set of results, if any.
func (client VirtualMachineScaleSetsClient) ListSkusNextResults(lastResults VirtualMachineScaleSetListSkusResult) (result VirtualMachineScaleSetListSkusResult, err error) {
	req, err := lastResults.VirtualMachineScaleSetListSkusResultPreparer()
	if err != nil {
		return result, autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListSkus", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}

	resp, err := client.ListSkusSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListSkus", resp, "Failure sending next results request")
	}

	result, err = client.ListSkusResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ListSkus", resp, "Failure responding to next results request")
	}

	return
}

// PowerOff power off (stop) one or more virtual machines in a VM scale set.
// Note that resources are still attached and you are getting charged for the
// resources. Instead, use deallocate to release resources and avoid charges.
// This method may poll for completion. Polling can be canceled by passing the
// cancel channel argument. The channel will be used to cancel polling and any
// outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set. VMInstanceIDs is a list of virtual machine
// instance IDs from the VM scale set.
func (client VirtualMachineScaleSetsClient) PowerOff(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.PowerOffPreparer(resourceGroupName, VMScaleSetName, VMInstanceIDs, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "PowerOff", nil, "Failure preparing request")
			return
		}

		resp, err := client.PowerOffSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "PowerOff", resp, "Failure sending request")
			return
		}

		result, err = client.PowerOffResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "PowerOff", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// PowerOffPreparer prepares the PowerOff request.
func (client VirtualMachineScaleSetsClient) PowerOffPreparer(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/poweroff", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	if VMInstanceIDs != nil {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithJSON(VMInstanceIDs))
	}
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// PowerOffSender sends the PowerOff request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) PowerOffSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// PowerOffResponder handles the response to the PowerOff request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) PowerOffResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Reimage reimages (upgrade the operating system) one or more virtual machines
// in a VM scale set. This method may poll for completion. Polling can be
// canceled by passing the cancel channel argument. The channel will be used to
// cancel polling and any outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set.
func (client VirtualMachineScaleSetsClient) Reimage(resourceGroupName string, VMScaleSetName string, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.ReimagePreparer(resourceGroupName, VMScaleSetName, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Reimage", nil, "Failure preparing request")
			return
		}

		resp, err := client.ReimageSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Reimage", resp, "Failure sending request")
			return
		}

		result, err = client.ReimageResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Reimage", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// ReimagePreparer prepares the Reimage request.
func (client VirtualMachineScaleSetsClient) ReimagePreparer(resourceGroupName string, VMScaleSetName string, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/reimage", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// ReimageSender sends the Reimage request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) ReimageSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// ReimageResponder handles the response to the Reimage request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) ReimageResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// ReimageAll reimages all the disks ( including data disks ) in the virtual
// machines in a virtual machine scale set. This operation is only supported
// for managed disks. This method may poll for completion. Polling can be
// canceled by passing the cancel channel argument. The channel will be used to
// cancel polling and any outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set.
func (client VirtualMachineScaleSetsClient) ReimageAll(resourceGroupName string, VMScaleSetName string, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.ReimageAllPreparer(resourceGroupName, VMScaleSetName, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ReimageAll", nil, "Failure preparing request")
			return
		}

		resp, err := client.ReimageAllSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ReimageAll", resp, "Failure sending request")
			return
		}

		result, err = client.ReimageAllResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "ReimageAll", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// ReimageAllPreparer prepares the ReimageAll request.
func (client VirtualMachineScaleSetsClient) ReimageAllPreparer(resourceGroupName string, VMScaleSetName string, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/reimageall", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// ReimageAllSender sends the ReimageAll request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) ReimageAllSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// ReimageAllResponder handles the response to the ReimageAll request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) ReimageAllResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Restart restarts one or more virtual machines in a VM scale set. This method
// may poll for completion. Polling can be canceled by passing the cancel
// channel argument. The channel will be used to cancel polling and any
// outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set. VMInstanceIDs is a list of virtual machine
// instance IDs from the VM scale set.
func (client VirtualMachineScaleSetsClient) Restart(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.RestartPreparer(resourceGroupName, VMScaleSetName, VMInstanceIDs, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Restart", nil, "Failure preparing request")
			return
		}

		resp, err := client.RestartSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Restart", resp, "Failure sending request")
			return
		}

		result, err = client.RestartResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Restart", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// RestartPreparer prepares the Restart request.
func (client VirtualMachineScaleSetsClient) RestartPreparer(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/restart", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	if VMInstanceIDs != nil {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithJSON(VMInstanceIDs))
	}
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// RestartSender sends the Restart request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) RestartSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// RestartResponder handles the response to the Restart request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) RestartResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Start starts one or more virtual machines in a VM scale set. This method may
// poll for completion. Polling can be canceled by passing the cancel channel
// argument. The channel will be used to cancel polling and any outstanding
// HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set. VMInstanceIDs is a list of virtual machine
// instance IDs from the VM scale set.
func (client VirtualMachineScaleSetsClient) Start(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.StartPreparer(resourceGroupName, VMScaleSetName, VMInstanceIDs, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Start", nil, "Failure preparing request")
			return
		}

		resp, err := client.StartSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Start", resp, "Failure sending request")
			return
		}

		result, err = client.StartResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "Start", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// StartPreparer prepares the Start request.
func (client VirtualMachineScaleSetsClient) StartPreparer(resourceGroupName string, VMScaleSetName string, VMInstanceIDs *VirtualMachineScaleSetVMInstanceIDs, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/start", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	if VMInstanceIDs != nil {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithJSON(VMInstanceIDs))
	}
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// StartSender sends the Start request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) StartSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// StartResponder handles the response to the Start request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) StartResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// UpdateInstances upgrades one or more virtual machines to the latest SKU set
// in the VM scale set model. This method may poll for completion. Polling can
// be canceled by passing the cancel channel argument. The channel will be used
// to cancel polling and any outstanding HTTP requests.
//
// resourceGroupName is the name of the resource group. VMScaleSetName is the
// name of the VM scale set. VMInstanceIDs is a list of virtual machine
// instance IDs from the VM scale set.
func (client VirtualMachineScaleSetsClient) UpdateInstances(resourceGroupName string, VMScaleSetName string, VMInstanceIDs VirtualMachineScaleSetVMInstanceRequiredIDs, cancel <-chan struct{}) (<-chan OperationStatusResponse, <-chan error) {
	resultChan := make(chan OperationStatusResponse, 1)
	errChan := make(chan error, 1)
	if err := validation.Validate([]validation.Validation{
		{TargetValue: VMInstanceIDs,
			Constraints: []validation.Constraint{{Target: "VMInstanceIDs.InstanceIds", Name: validation.Null, Rule: true, Chain: nil}}}}); err != nil {
		errChan <- validation.NewErrorWithValidationError(err, "compute.VirtualMachineScaleSetsClient", "UpdateInstances")
		close(errChan)
		close(resultChan)
		return resultChan, errChan
	}

	go func() {
		var err error
		var result OperationStatusResponse
		defer func() {
			resultChan <- result
			errChan <- err
			close(resultChan)
			close(errChan)
		}()
		req, err := client.UpdateInstancesPreparer(resourceGroupName, VMScaleSetName, VMInstanceIDs, cancel)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "UpdateInstances", nil, "Failure preparing request")
			return
		}

		resp, err := client.UpdateInstancesSender(req)
		if err != nil {
			result.Response = autorest.Response{Response: resp}
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "UpdateInstances", resp, "Failure sending request")
			return
		}

		result, err = client.UpdateInstancesResponder(resp)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.VirtualMachineScaleSetsClient", "UpdateInstances", resp, "Failure responding to request")
		}
	}()
	return resultChan, errChan
}

// UpdateInstancesPreparer prepares the UpdateInstances request.
func (client VirtualMachineScaleSetsClient) UpdateInstancesPreparer(resourceGroupName string, VMScaleSetName string, VMInstanceIDs VirtualMachineScaleSetVMInstanceRequiredIDs, cancel <-chan struct{}) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"vmScaleSetName":    autorest.Encode("path", VMScaleSetName),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsJSON(),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/manualupgrade", pathParameters),
		autorest.WithJSON(VMInstanceIDs),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare(&http.Request{Cancel: cancel})
}

// UpdateInstancesSender sends the UpdateInstances request. The method will close the
// http.Response Body if it receives an error.
func (client VirtualMachineScaleSetsClient) UpdateInstancesSender(req *http.Request) (*http.Response, error) {
	return autorest.SendWithSender(client,
		req,
		azure.DoPollForAsynchronous(client.PollingDelay))
}

// UpdateInstancesResponder handles the response to the UpdateInstances request. The method always
// closes the http.Response Body.
func (client VirtualMachineScaleSetsClient) UpdateInstancesResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		client.ByInspecting(),
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}