zones.go

package dns

// 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.
// Changes may cause incorrect behavior and will be lost if the code is regenerated.

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

// ZonesClient is the the DNS Management Client.
type ZonesClient struct {
	BaseClient
}

// NewZonesClient creates an instance of the ZonesClient client.
func NewZonesClient(subscriptionID string) ZonesClient {
	return NewZonesClientWithBaseURI(DefaultBaseURI, subscriptionID)
}

// NewZonesClientWithBaseURI creates an instance of the ZonesClient client using a custom endpoint.  Use this when
// interacting with an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure stack).
func NewZonesClientWithBaseURI(baseURI string, subscriptionID string) ZonesClient {
	return ZonesClient{NewWithBaseURI(baseURI, subscriptionID)}
}

// CreateOrUpdate creates or updates a DNS zone. Does not modify DNS records within the zone.
// Parameters:
// resourceGroupName - the name of the resource group. The name is case insensitive.
// zoneName - the name of the DNS zone (without a terminating dot).
// parameters - parameters supplied to the CreateOrUpdate operation.
// ifMatch - the etag of the DNS zone. Omit this value to always overwrite the current zone. Specify the
// last-seen etag value to prevent accidentally overwriting any concurrent changes.
// ifNoneMatch - set to '*' to allow a new DNS zone to be created, but to prevent updating an existing zone.
// Other values will be ignored.
func (client ZonesClient) CreateOrUpdate(ctx context.Context, resourceGroupName string, zoneName string, parameters Zone, ifMatch string, ifNoneMatch string) (result Zone, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.CreateOrUpdate")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: resourceGroupName,
			Constraints: []validation.Constraint{{Target: "resourceGroupName", Name: validation.MaxLength, Rule: 90, Chain: nil},
				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[-\w\._\(\)]+$`, Chain: nil}}},
		{TargetValue: client.SubscriptionID,
			Constraints: []validation.Constraint{{Target: "client.SubscriptionID", Name: validation.MinLength, Rule: 1, Chain: nil}}}}); err != nil {
		return result, validation.NewError("dns.ZonesClient", "CreateOrUpdate", err.Error())
	}

	req, err := client.CreateOrUpdatePreparer(ctx, resourceGroupName, zoneName, parameters, ifMatch, ifNoneMatch)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "CreateOrUpdate", nil, "Failure preparing request")
		return
	}

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

	result, err = client.CreateOrUpdateResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "CreateOrUpdate", resp, "Failure responding to request")
	}

	return
}

// CreateOrUpdatePreparer prepares the CreateOrUpdate request.
func (client ZonesClient) CreateOrUpdatePreparer(ctx context.Context, resourceGroupName string, zoneName string, parameters Zone, ifMatch string, ifNoneMatch string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"zoneName":          autorest.Encode("path", zoneName),
	}

	const APIVersion = "2017-10-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsContentType("application/json; charset=utf-8"),
		autorest.AsPut(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/dnsZones/{zoneName}", pathParameters),
		autorest.WithJSON(parameters),
		autorest.WithQueryParameters(queryParameters))
	if len(ifMatch) > 0 {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithHeader("If-Match", autorest.String(ifMatch)))
	}
	if len(ifNoneMatch) > 0 {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithHeader("If-None-Match", autorest.String(ifNoneMatch)))
	}
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// CreateOrUpdateSender sends the CreateOrUpdate request. The method will close the
// http.Response Body if it receives an error.
func (client ZonesClient) CreateOrUpdateSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

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

// Delete deletes a DNS zone. WARNING: All DNS records in the zone will also be deleted. This operation cannot be
// undone.
// Parameters:
// resourceGroupName - the name of the resource group. The name is case insensitive.
// zoneName - the name of the DNS zone (without a terminating dot).
// ifMatch - the etag of the DNS zone. Omit this value to always delete the current zone. Specify the last-seen
// etag value to prevent accidentally deleting any concurrent changes.
func (client ZonesClient) Delete(ctx context.Context, resourceGroupName string, zoneName string, ifMatch string) (result ZonesDeleteFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.Delete")
		defer func() {
			sc := -1
			if result.Response() != nil {
				sc = result.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: resourceGroupName,
			Constraints: []validation.Constraint{{Target: "resourceGroupName", Name: validation.MaxLength, Rule: 90, Chain: nil},
				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[-\w\._\(\)]+$`, Chain: nil}}},
		{TargetValue: client.SubscriptionID,
			Constraints: []validation.Constraint{{Target: "client.SubscriptionID", Name: validation.MinLength, Rule: 1, Chain: nil}}}}); err != nil {
		return result, validation.NewError("dns.ZonesClient", "Delete", err.Error())
	}

	req, err := client.DeletePreparer(ctx, resourceGroupName, zoneName, ifMatch)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "Delete", nil, "Failure preparing request")
		return
	}

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

	return
}

// DeletePreparer prepares the Delete request.
func (client ZonesClient) DeletePreparer(ctx context.Context, resourceGroupName string, zoneName string, ifMatch string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"zoneName":          autorest.Encode("path", zoneName),
	}

	const APIVersion = "2017-10-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsDelete(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/dnsZones/{zoneName}", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	if len(ifMatch) > 0 {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithHeader("If-Match", autorest.String(ifMatch)))
	}
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// DeleteSender sends the Delete request. The method will close the
// http.Response Body if it receives an error.
func (client ZonesClient) DeleteSender(req *http.Request) (future ZonesDeleteFuture, err error) {
	var resp *http.Response
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	future.Future, err = azure.NewFutureFromResponse(resp)
	return
}

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

// Get gets a DNS zone. Retrieves the zone properties, but not the record sets within the zone.
// Parameters:
// resourceGroupName - the name of the resource group. The name is case insensitive.
// zoneName - the name of the DNS zone (without a terminating dot).
func (client ZonesClient) Get(ctx context.Context, resourceGroupName string, zoneName string) (result Zone, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.Get")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: resourceGroupName,
			Constraints: []validation.Constraint{{Target: "resourceGroupName", Name: validation.MaxLength, Rule: 90, Chain: nil},
				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[-\w\._\(\)]+$`, Chain: nil}}},
		{TargetValue: client.SubscriptionID,
			Constraints: []validation.Constraint{{Target: "client.SubscriptionID", Name: validation.MinLength, Rule: 1, Chain: nil}}}}); err != nil {
		return result, validation.NewError("dns.ZonesClient", "Get", err.Error())
	}

	req, err := client.GetPreparer(ctx, resourceGroupName, zoneName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "Get", nil, "Failure preparing request")
		return
	}

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

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

	return
}

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

	const APIVersion = "2017-10-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

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

// GetSender sends the Get request. The method will close the
// http.Response Body if it receives an error.
func (client ZonesClient) GetSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

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

// List lists the DNS zones in all resource groups in a subscription.
// Parameters:
// top - the maximum number of DNS zones to return. If not specified, returns up to 100 zones.
func (client ZonesClient) List(ctx context.Context, top *int32) (result ZoneListResultPage, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.List")
		defer func() {
			sc := -1
			if result.zlr.Response.Response != nil {
				sc = result.zlr.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: client.SubscriptionID,
			Constraints: []validation.Constraint{{Target: "client.SubscriptionID", Name: validation.MinLength, Rule: 1, Chain: nil}}}}); err != nil {
		return result, validation.NewError("dns.ZonesClient", "List", err.Error())
	}

	result.fn = client.listNextResults
	req, err := client.ListPreparer(ctx, top)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "List", nil, "Failure preparing request")
		return
	}

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

	result.zlr, err = client.ListResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "List", resp, "Failure responding to request")
	}
	if result.zlr.hasNextLink() && result.zlr.IsEmpty() {
		err = result.NextWithContext(ctx)
	}

	return
}

// ListPreparer prepares the List request.
func (client ZonesClient) ListPreparer(ctx context.Context, top *int32) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"subscriptionId": autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2017-10-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}
	if top != nil {
		queryParameters["$top"] = autorest.Encode("query", *top)
	}

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

// ListSender sends the List request. The method will close the
// http.Response Body if it receives an error.
func (client ZonesClient) ListSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

// ListResponder handles the response to the List request. The method always
// closes the http.Response Body.
func (client ZonesClient) ListResponder(resp *http.Response) (result ZoneListResult, err error) {
	err = autorest.Respond(
		resp,
		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 ZonesClient) listNextResults(ctx context.Context, lastResults ZoneListResult) (result ZoneListResult, err error) {
	req, err := lastResults.zoneListResultPreparer(ctx)
	if err != nil {
		return result, autorest.NewErrorWithError(err, "dns.ZonesClient", "listNextResults", 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, "dns.ZonesClient", "listNextResults", resp, "Failure sending next results request")
	}
	result, err = client.ListResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "listNextResults", resp, "Failure responding to next results request")
	}
	return
}

// ListComplete enumerates all values, automatically crossing page boundaries as required.
func (client ZonesClient) ListComplete(ctx context.Context, top *int32) (result ZoneListResultIterator, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.List")
		defer func() {
			sc := -1
			if result.Response().Response.Response != nil {
				sc = result.page.Response().Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.page, err = client.List(ctx, top)
	return
}

// ListByResourceGroup lists the DNS zones within a resource group.
// Parameters:
// resourceGroupName - the name of the resource group. The name is case insensitive.
// top - the maximum number of record sets to return. If not specified, returns up to 100 record sets.
func (client ZonesClient) ListByResourceGroup(ctx context.Context, resourceGroupName string, top *int32) (result ZoneListResultPage, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.ListByResourceGroup")
		defer func() {
			sc := -1
			if result.zlr.Response.Response != nil {
				sc = result.zlr.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: resourceGroupName,
			Constraints: []validation.Constraint{{Target: "resourceGroupName", Name: validation.MaxLength, Rule: 90, Chain: nil},
				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[-\w\._\(\)]+$`, Chain: nil}}},
		{TargetValue: client.SubscriptionID,
			Constraints: []validation.Constraint{{Target: "client.SubscriptionID", Name: validation.MinLength, Rule: 1, Chain: nil}}}}); err != nil {
		return result, validation.NewError("dns.ZonesClient", "ListByResourceGroup", err.Error())
	}

	result.fn = client.listByResourceGroupNextResults
	req, err := client.ListByResourceGroupPreparer(ctx, resourceGroupName, top)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "ListByResourceGroup", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListByResourceGroupSender(req)
	if err != nil {
		result.zlr.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "ListByResourceGroup", resp, "Failure sending request")
		return
	}

	result.zlr, err = client.ListByResourceGroupResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "ListByResourceGroup", resp, "Failure responding to request")
	}
	if result.zlr.hasNextLink() && result.zlr.IsEmpty() {
		err = result.NextWithContext(ctx)
	}

	return
}

// ListByResourceGroupPreparer prepares the ListByResourceGroup request.
func (client ZonesClient) ListByResourceGroupPreparer(ctx context.Context, resourceGroupName string, top *int32) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2017-10-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}
	if top != nil {
		queryParameters["$top"] = autorest.Encode("query", *top)
	}

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

// ListByResourceGroupSender sends the ListByResourceGroup request. The method will close the
// http.Response Body if it receives an error.
func (client ZonesClient) ListByResourceGroupSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

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

// listByResourceGroupNextResults retrieves the next set of results, if any.
func (client ZonesClient) listByResourceGroupNextResults(ctx context.Context, lastResults ZoneListResult) (result ZoneListResult, err error) {
	req, err := lastResults.zoneListResultPreparer(ctx)
	if err != nil {
		return result, autorest.NewErrorWithError(err, "dns.ZonesClient", "listByResourceGroupNextResults", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}
	resp, err := client.ListByResourceGroupSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "dns.ZonesClient", "listByResourceGroupNextResults", resp, "Failure sending next results request")
	}
	result, err = client.ListByResourceGroupResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "listByResourceGroupNextResults", resp, "Failure responding to next results request")
	}
	return
}

// ListByResourceGroupComplete enumerates all values, automatically crossing page boundaries as required.
func (client ZonesClient) ListByResourceGroupComplete(ctx context.Context, resourceGroupName string, top *int32) (result ZoneListResultIterator, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.ListByResourceGroup")
		defer func() {
			sc := -1
			if result.Response().Response.Response != nil {
				sc = result.page.Response().Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.page, err = client.ListByResourceGroup(ctx, resourceGroupName, top)
	return
}

// Update updates a DNS zone. Does not modify DNS records within the zone.
// Parameters:
// resourceGroupName - the name of the resource group. The name is case insensitive.
// zoneName - the name of the DNS zone (without a terminating dot).
// parameters - parameters supplied to the Update operation.
// ifMatch - the etag of the DNS zone. Omit this value to always overwrite the current zone. Specify the
// last-seen etag value to prevent accidentally overwriting any concurrent changes.
func (client ZonesClient) Update(ctx context.Context, resourceGroupName string, zoneName string, parameters ZoneUpdate, ifMatch string) (result Zone, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ZonesClient.Update")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: resourceGroupName,
			Constraints: []validation.Constraint{{Target: "resourceGroupName", Name: validation.MaxLength, Rule: 90, Chain: nil},
				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[-\w\._\(\)]+$`, Chain: nil}}},
		{TargetValue: client.SubscriptionID,
			Constraints: []validation.Constraint{{Target: "client.SubscriptionID", Name: validation.MinLength, Rule: 1, Chain: nil}}}}); err != nil {
		return result, validation.NewError("dns.ZonesClient", "Update", err.Error())
	}

	req, err := client.UpdatePreparer(ctx, resourceGroupName, zoneName, parameters, ifMatch)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "Update", nil, "Failure preparing request")
		return
	}

	resp, err := client.UpdateSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "Update", resp, "Failure sending request")
		return
	}

	result, err = client.UpdateResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "dns.ZonesClient", "Update", resp, "Failure responding to request")
	}

	return
}

// UpdatePreparer prepares the Update request.
func (client ZonesClient) UpdatePreparer(ctx context.Context, resourceGroupName string, zoneName string, parameters ZoneUpdate, ifMatch string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
		"zoneName":          autorest.Encode("path", zoneName),
	}

	const APIVersion = "2017-10-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsContentType("application/json; charset=utf-8"),
		autorest.AsPatch(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/dnsZones/{zoneName}", pathParameters),
		autorest.WithJSON(parameters),
		autorest.WithQueryParameters(queryParameters))
	if len(ifMatch) > 0 {
		preparer = autorest.DecoratePreparer(preparer,
			autorest.WithHeader("If-Match", autorest.String(ifMatch)))
	}
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// UpdateSender sends the Update request. The method will close the
// http.Response Body if it receives an error.
func (client ZonesClient) UpdateSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

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