You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: create_aws_worker_pool_activity.go
    path of file: ./repos/pipeline/internal/providers/pke/pkeworkflow
    
    the code of the file until where you have to start completion: // Copyright Â© 2019 Banzai Cloud
//
// 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.

package pkeworkflow

import (
	"context"
	"fmt"
	"strconv"
	"strings"

	"emperror.dev/errors"
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/service/cloudformation"
	"go.uber.org/cadence/activity"

	cloudformation2 "github.com/banzaicloud/pipeline/internal/cloudformation"
	"github.com/banzaicloud/pipeline/internal/cluster/distribution/pke/pkeaws"
	"github.com/banzaicloud/pipeline/internal/providers/amazon"
	pkgCloudformation "github.com/banzaicloud/pipeline/pkg/providers/amazon/cloudformation"
	sdkAmazon "github.com/banzaicloud/pipeline/pkg/sdk/providers/amazon"
)

const CreateWorkerPoolActivityName = "pke-create-aws-worker-pool-activity"

const WorkerCloudFormationTemplate = "worker.cf.yaml"

type CreateWorkerPoolActivity struct {
	clusters       Clusters
	tokenGenerator TokenGenerator
}

func NewCreateWorkerPoolActivity(
	clusters Clusters,
	tokenGenerator TokenGenerator,
) *CreateWorkerPoolActivity {
	return &CreateWorkerPoolActivity{
		clusters:       clusters,
		tokenGenerator: tokenGenerator,
	}
}

type CreateWorkerPoolActivityInput struct {
	ClusterID                 uint
	Pool                      NodePool
	VPCID                     string
	VPCDefaultSecurityGroupID string
	SubnetIDs                 []string
	WorkerInstanceProfile     string
	ClusterSecurityGroup      string
	ExternalBaseUrl           string
	ExternalBaseUrlInsecure   bool
	ImageID                   string
	SSHKeyName                string
}

func (a *CreateWorkerPoolActivity) Execute(ctx context.Context, input CreateWorkerPoolActivityInput) (string, error) {
	log := activity.GetLogger(ctx).Sugar().With("clusterID", input.ClusterID)
	cluster, err := a.clusters.GetCluster(ctx, input.ClusterID)
	if err != nil {
		return "", err
	}

	stackName := fmt.Sprintf("pke-pool-%s-worker-%s", cluster.GetName(), input.Pool.Name)

	awsCluster, ok := cluster.(AWSCluster)
	if !ok {
		return "", errors.New(fmt.Sprintf("can't get AWS client for %t", cluster))
	}

	_, signedToken, err := a.tokenGenerator.GenerateClusterToken(cluster.GetOrganizationId(), cluster.GetID())
	if err != nil {
		return "", errors.WrapIf(err, "can't generate Pipeline token")
	}

	bootstrapCommand, err := awsCluster.GetBootstrapCommand(input.Pool.Name, input.ExternalBaseUrl, input.ExternalBaseUrlInsecure, signedToken, nil, "")
	if err != nil {
		return "", errors.WrapIf(err, "failed to fetch bootstrap command")
	}

	client, err := awsCluster.GetAWSClient()
	if err != nil {
		return "", errors.WrapIf(err, "failed to connect to AWS")
	}

	cfClient := cloudformation.New(client)

	template, err := cloudformation2.GetCloudFormationTemplate(PKECloudFormationTemplateBasePath, WorkerCloudFormationTemplate)
	if err != nil {
		return "", errors.WrapIf(err, "loading CF template")
	}

	spotPrice, err := strconv.ParseFloat(input.Pool.SpotPrice, 64)
	if err !
    
func (a *CreateWorkerPoolActivity) Execute(ctx context.Context, input CreateWorkerPoolActivityInput) (string, error) {
	log := activity.GetLogger(ctx).Sugar().With("clusterID", input.ClusterID)
	cluster, err := a.clusters.GetCluster(ctx, input.ClusterID)
	if err != nil {
		return "", err
	}

	stackName := fmt.Sprintf("pke-pool-%s-worker-%s", cluster.GetName(), input.Pool.Name)

	awsCluster, ok := cluster.(AWSCluster)
	if !ok {
		return "", errors.New(fmt.Sprintf("can't get AWS client for %t", cluster))
	}

	_, signedToken, err := a.tokenGenerator.GenerateClusterToken(cluster.GetOrganizationId(), cluster.GetID())
	if err != nil {
		return "", errors.WrapIf(err, "can't generate Pipeline token")
	}

	bootstrapCommand, err := awsCluster.GetBootstrapCommand(input.Pool.Name, input.ExternalBaseUrl, input.ExternalBaseUrlInsecure, signedToken, nil, "")
	if err != nil {
		return "", errors.WrapIf(err, "failed to fetch bootstrap command")
	}

	client, err := awsCluster.GetAWSClient()
	if err != nil {
		return "", errors.WrapIf(err, "failed to connect to AWS")
	}

	cfClient := cloudformation.New(client)

	template, err := cloudformation2.GetCloudFormationTemplate(PKECloudFormationTemplateBasePath, WorkerCloudFormationTemplate)
	if err != nil {
		return "", errors.WrapIf(err, "loading CF template")
	}

	spotPrice, err := strconv.ParseFloat(input.Pool.SpotPrice, 64)
	if err != nil || spotPrice <= 0.0 {
		input.Pool.SpotPrice = ""
	}

	clusterName := cluster.GetName()

	autoscaling := aws.String("false")
	if input.Pool.Autoscaling {
		autoscaling = aws.String("true")
	}

	desired := input.Pool.Count
	if desired < input.Pool.MinCount {
		desired = input.Pool.MinCount
	}
	if desired > input.Pool.MaxCount {
		desired = input.Pool.MaxCount
	}

	stackInput := &cloudformation.CreateStackInput{
		StackName:          aws.String(stackName),
		TemplateBody:       aws.String(template),
		ClientRequestToken: aws.String(sdkAmazon.NewNormalizedClientRequestToken(activity.GetInfo(ctx).WorkflowExecution.ID)),
		Parameters: []*cloudformation.Parameter{
			{
				ParameterKey:   aws.String("ClusterName"),
				ParameterValue: &clusterName,
			},
			{
				ParameterKey:   aws.String("NodeGroupName"),
				ParameterValue: &input.Pool.Name,
			},
			{
				ParameterKey:   aws.String("PkeCommand"),
				ParameterValue: &bootstrapCommand,
			},
			{
				ParameterKey:   aws.String("InstanceType"),
				ParameterValue: aws.String(input.Pool.InstanceType),
			},
			{
				ParameterKey:   aws.String("VPCId"),
				ParameterValue: &input.VPCID,
			},
			{
				ParameterKey:   aws.String("VPCDefaultSecurityGroupId"),
				ParameterValue: &input.VPCDefaultSecurityGroupID,
			},
			{
				ParameterKey:   aws.String("SubnetIds"),
				ParameterValue: aws.String(strings.Join(input.SubnetIDs, ",")),
			},
			{
				ParameterKey:   aws.String("IamInstanceProfile"),
				ParameterValue: &input.WorkerInstanceProfile,
			},
			{
				ParameterKey:   aws.String("ImageId"),
				ParameterValue: aws.String(input.Pool.ImageID),
			},
			{
				ParameterKey:   aws.String("VolumeSize"),
				ParameterValue: aws.String(strconv.Itoa(input.Pool.VolumeSize)),
			},
			{
				ParameterKey:   aws.String("PkeVersion"),
				ParameterValue: aws.String(pkeaws.Version),
			},
			{
				ParameterKey:   aws.String("KeyName"),
				ParameterValue: aws.String(input.SSHKeyName),
			},
			{
				ParameterKey:   aws.String("MinSize"),
				ParameterValue: aws.String(strconv.Itoa(input.Pool.MinCount)),
			},
			{
				ParameterKey:   aws.String("MaxSize"),
				ParameterValue: aws.String(strconv.Itoa(input.Pool.MaxCount)),
			},
			{
				ParameterKey:   aws.String("DesiredCapacity"),
				ParameterValue: aws.String(strconv.Itoa(desired)),
			},
			{
				ParameterKey:   aws.String("ClusterSecurityGroup"),
				ParameterValue: aws.String(input.ClusterSecurityGroup),
			},
			{
				ParameterKey:   aws.String("NodeSpotPrice"),
				ParameterValue: aws.String(input.Pool.SpotPrice),
			},
			{
				ParameterKey:   aws.String("ClusterAutoscalerEnabled"),
				ParameterValue: autoscaling,
			},
		},
		Tags: amazon.PipelineTags(),
	}

	output, err := cfClient.CreateStack(stackInput)
	if err, ok := err.(awserr.Error); ok {
		switch err.Code() {
		case cloudformation.ErrCodeAlreadyExistsException:
			log.Infof("stack already exists: %s", err.Message())
		default:
			return "", err
		}
	} else if err != nil {
		return "", err
	}

	err = cfClient.WaitUntilStackCreateCompleteWithContext(ctx, &cloudformation.DescribeStacksInput{StackName: aws.String(stackName)})
	if err != nil {
		return "", errors.WrapIf(pkgCloudformation.NewAwsStackFailure(err, stackName, "", cfClient), "waiting for stack creation")
	}

	if output.StackId != nil {
		return *output.StackId, nil
	}
	return stackName, nil
}