elasticpools.go

package sql

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
// 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"
)

// ElasticPoolsClient is the the Azure SQL Database management API provides a RESTful set of web services that interact
// with Azure SQL Database services to manage your databases. The API enables you to create, retrieve, update, and
// delete databases.
type ElasticPoolsClient struct {
	BaseClient
}

// NewElasticPoolsClient creates an instance of the ElasticPoolsClient client.
func NewElasticPoolsClient(subscriptionID string) ElasticPoolsClient {
	return NewElasticPoolsClientWithBaseURI(DefaultBaseURI, subscriptionID)
}

// NewElasticPoolsClientWithBaseURI creates an instance of the ElasticPoolsClient 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 NewElasticPoolsClientWithBaseURI(baseURI string, subscriptionID string) ElasticPoolsClient {
	return ElasticPoolsClient{NewWithBaseURI(baseURI, subscriptionID)}
}

// CreateOrUpdate creates or updates an elastic pool.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool.
// parameters - the elastic pool parameters.
func (client ElasticPoolsClient) CreateOrUpdate(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string, parameters ElasticPool) (result ElasticPoolsCreateOrUpdateFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.CreateOrUpdate")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: parameters,
			Constraints: []validation.Constraint{{Target: "parameters.Sku", Name: validation.Null, Rule: false,
				Chain: []validation.Constraint{{Target: "parameters.Sku.Name", Name: validation.Null, Rule: true, Chain: nil}}}}}}); err != nil {
		return result, validation.NewError("sql.ElasticPoolsClient", "CreateOrUpdate", err.Error())
	}

	req, err := client.CreateOrUpdatePreparer(ctx, resourceGroupName, serverName, elasticPoolName, parameters)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "CreateOrUpdate", nil, "Failure preparing request")
		return
	}

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

	return
}

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

	const APIVersion = "2020-08-01-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	parameters.Kind = nil
	preparer := autorest.CreatePreparer(
		autorest.AsContentType("application/json; charset=utf-8"),
		autorest.AsPut(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Sql/servers/{serverName}/elasticPools/{elasticPoolName}", pathParameters),
		autorest.WithJSON(parameters),
		autorest.WithQueryParameters(queryParameters))
	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 ElasticPoolsClient) CreateOrUpdateSender(req *http.Request) (future ElasticPoolsCreateOrUpdateFuture, err error) {
	var resp *http.Response
	future.FutureAPI = &azure.Future{}
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = future.result
	return
}

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

// Delete deletes an elastic pool.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool.
func (client ElasticPoolsClient) Delete(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string) (result ElasticPoolsDeleteFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.Delete")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.DeletePreparer(ctx, resourceGroupName, serverName, elasticPoolName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "Delete", nil, "Failure preparing request")
		return
	}

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

	return
}

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

	const APIVersion = "2020-08-01-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.Sql/servers/{serverName}/elasticPools/{elasticPoolName}", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	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 ElasticPoolsClient) DeleteSender(req *http.Request) (future ElasticPoolsDeleteFuture, err error) {
	var resp *http.Response
	future.FutureAPI = &azure.Future{}
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = future.result
	return
}

// DeleteResponder handles the response to the Delete request. The method always
// closes the http.Response Body.
func (client ElasticPoolsClient) 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
}

// Failover failovers an elastic pool.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool to failover.
func (client ElasticPoolsClient) Failover(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string) (result ElasticPoolsFailoverFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.Failover")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.FailoverPreparer(ctx, resourceGroupName, serverName, elasticPoolName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "Failover", nil, "Failure preparing request")
		return
	}

	result, err = client.FailoverSender(req)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "Failover", result.Response(), "Failure sending request")
		return
	}

	return
}

// FailoverPreparer prepares the Failover request.
func (client ElasticPoolsClient) FailoverPreparer(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"elasticPoolName":   autorest.Encode("path", elasticPoolName),
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"serverName":        autorest.Encode("path", serverName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2020-08-01-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.Sql/servers/{serverName}/elasticPools/{elasticPoolName}/failover", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// FailoverSender sends the Failover request. The method will close the
// http.Response Body if it receives an error.
func (client ElasticPoolsClient) FailoverSender(req *http.Request) (future ElasticPoolsFailoverFuture, err error) {
	var resp *http.Response
	future.FutureAPI = &azure.Future{}
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = future.result
	return
}

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

// Get gets an elastic pool.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool.
func (client ElasticPoolsClient) Get(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string) (result ElasticPool, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.Get")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.GetPreparer(ctx, resourceGroupName, serverName, elasticPoolName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "Get", nil, "Failure preparing request")
		return
	}

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

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

	return
}

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

	const APIVersion = "2020-08-01-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.Sql/servers/{serverName}/elasticPools/{elasticPoolName}", 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 ElasticPoolsClient) 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 ElasticPoolsClient) GetResponder(resp *http.Response) (result ElasticPool, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// ListByServer gets all elastic pools in a server.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// skip - the number of elements in the collection to skip.
func (client ElasticPoolsClient) ListByServer(ctx context.Context, resourceGroupName string, serverName string, skip *int32) (result ElasticPoolListResultPage, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.ListByServer")
		defer func() {
			sc := -1
			if result.eplr.Response.Response != nil {
				sc = result.eplr.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.fn = client.listByServerNextResults
	req, err := client.ListByServerPreparer(ctx, resourceGroupName, serverName, skip)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListByServer", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListByServerSender(req)
	if err != nil {
		result.eplr.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListByServer", resp, "Failure sending request")
		return
	}

	result.eplr, err = client.ListByServerResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListByServer", resp, "Failure responding to request")
		return
	}
	if result.eplr.hasNextLink() && result.eplr.IsEmpty() {
		err = result.NextWithContext(ctx)
		return
	}

	return
}

// ListByServerPreparer prepares the ListByServer request.
func (client ElasticPoolsClient) ListByServerPreparer(ctx context.Context, resourceGroupName string, serverName string, skip *int32) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"serverName":        autorest.Encode("path", serverName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2020-08-01-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}
	if skip != nil {
		queryParameters["$skip"] = autorest.Encode("query", *skip)
	}

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

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

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

// listByServerNextResults retrieves the next set of results, if any.
func (client ElasticPoolsClient) listByServerNextResults(ctx context.Context, lastResults ElasticPoolListResult) (result ElasticPoolListResult, err error) {
	req, err := lastResults.elasticPoolListResultPreparer(ctx)
	if err != nil {
		return result, autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "listByServerNextResults", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}
	resp, err := client.ListByServerSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "listByServerNextResults", resp, "Failure sending next results request")
	}
	result, err = client.ListByServerResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "listByServerNextResults", resp, "Failure responding to next results request")
	}
	return
}

// ListByServerComplete enumerates all values, automatically crossing page boundaries as required.
func (client ElasticPoolsClient) ListByServerComplete(ctx context.Context, resourceGroupName string, serverName string, skip *int32) (result ElasticPoolListResultIterator, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.ListByServer")
		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.ListByServer(ctx, resourceGroupName, serverName, skip)
	return
}

// ListMetricDefinitions returns elastic pool metric definitions.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool.
func (client ElasticPoolsClient) ListMetricDefinitions(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string) (result MetricDefinitionListResult, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.ListMetricDefinitions")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.ListMetricDefinitionsPreparer(ctx, resourceGroupName, serverName, elasticPoolName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListMetricDefinitions", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListMetricDefinitionsSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListMetricDefinitions", resp, "Failure sending request")
		return
	}

	result, err = client.ListMetricDefinitionsResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListMetricDefinitions", resp, "Failure responding to request")
		return
	}

	return
}

// ListMetricDefinitionsPreparer prepares the ListMetricDefinitions request.
func (client ElasticPoolsClient) ListMetricDefinitionsPreparer(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"elasticPoolName":   autorest.Encode("path", elasticPoolName),
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"serverName":        autorest.Encode("path", serverName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2014-04-01"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

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

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

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

// ListMetrics returns elastic pool  metrics.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool.
// filter - an OData filter expression that describes a subset of metrics to return.
func (client ElasticPoolsClient) ListMetrics(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string, filter string) (result MetricListResult, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.ListMetrics")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.ListMetricsPreparer(ctx, resourceGroupName, serverName, elasticPoolName, filter)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListMetrics", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListMetricsSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListMetrics", resp, "Failure sending request")
		return
	}

	result, err = client.ListMetricsResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "ListMetrics", resp, "Failure responding to request")
		return
	}

	return
}

// ListMetricsPreparer prepares the ListMetrics request.
func (client ElasticPoolsClient) ListMetricsPreparer(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string, filter string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"elasticPoolName":   autorest.Encode("path", elasticPoolName),
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"serverName":        autorest.Encode("path", serverName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2014-04-01"
	queryParameters := map[string]interface{}{
		"$filter":     autorest.Encode("query", filter),
		"api-version": APIVersion,
	}

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

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

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

// Update updates an elastic pool.
// Parameters:
// resourceGroupName - the name of the resource group that contains the resource. You can obtain this value
// from the Azure Resource Manager API or the portal.
// serverName - the name of the server.
// elasticPoolName - the name of the elastic pool.
// parameters - the elastic pool update parameters.
func (client ElasticPoolsClient) Update(ctx context.Context, resourceGroupName string, serverName string, elasticPoolName string, parameters ElasticPoolUpdate) (result ElasticPoolsUpdateFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/ElasticPoolsClient.Update")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.UpdatePreparer(ctx, resourceGroupName, serverName, elasticPoolName, parameters)
	if err != nil {
		err = autorest.NewErrorWithError(err, "sql.ElasticPoolsClient", "Update", nil, "Failure preparing request")
		return
	}

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

	return
}

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

	const APIVersion = "2020-08-01-preview"
	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.Sql/servers/{serverName}/elasticPools/{elasticPoolName}", pathParameters),
		autorest.WithJSON(parameters),
		autorest.WithQueryParameters(queryParameters))
	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 ElasticPoolsClient) UpdateSender(req *http.Request) (future ElasticPoolsUpdateFuture, err error) {
	var resp *http.Response
	future.FutureAPI = &azure.Future{}
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = future.result
	return
}

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