如何使用 golang 在谷歌云中创建多实例

Question

我正在尝试使用云功能在 GCP 中创建多实例，使用 golang 编程。

我参考https:\/\/medium.com\/google-cloud\/using-cloud-scheduler-and-cloud-functions-to-deploy-a-periodic-compute-engine-vm-worker-2b897ef68dc5<\/a>中的教程，然后编写一些自定义我的背景。 这是我的代码

package cloudfunctions

import (
    "context"
    "fmt"
    "log"
    "net/http"
    "os"
    "google.golang.org/api/compute/v1"
)

var ProjectID = ""
var Zone = ""
var Region = ""
var InstanceName = ""
var InstanceType = ""

func DeployInstance(w http.ResponseWriter, r *http.Request) {
    ProjectID = os.Getenv("PROJECT_ID")
    Zone = os.Getenv("ZONE")
    Region = os.Getenv("REGION")

    cs, err := InitComputeService()
    if err != nil {
        w.WriteHeader(http.StatusInternalServerError)
        log.Fatal(err)
    }

    var listInstance = []string{"e2-standard-2", "e2-standard-8", "n2-standard-2", "n2-standard-8", "n1-custom-2-8192", "n1-custom-8-32768", "c2-standard-8" }
    for i:=0; i < 7; i++ {
        InstanceType = listInstance[i]
        InstanceName = "benchmark-"+InstanceType
        
        instance, err := GetInstance(cs)
        if err != nil {
            w.WriteHeader(http.StatusTemporaryRedirect)
            w.Write([]byte(err.Error() + " instance may not exist yet"))
            log.Print(err)
    
            _, err = CreateInstance(cs)
            if err != nil {
                w.WriteHeader(http.StatusInternalServerError)
                w.Write([]byte("creating instance " + InstanceName + "in zone: " + Zone))
                startInstance(cs, w)
            }
    
        } else {
            msg := "instance is in intermediate state: " + instance.Status
            w.WriteHeader(http.StatusAccepted)
            w.Write([]byte(msg))
            log.Println(msg)
            
        }
    }
}

func InitComputeService() (*compute.Service, error) {
    ctx := context.Background()
    return compute.NewService(ctx)
}

func GetInstance(computeService *compute.Service) (*compute.Instance, error) {
    return computeService.Instances.Get(ProjectID, Zone, InstanceName).Do()
}


func StartInstance(computeService *compute.Service) (*compute.Operation, error) {
    return computeService.Instances.Start(ProjectID, Zone, InstanceName).Do()
}

// CreateInstance creates a given instance with metadata that logs its information.
func CreateInstance(computeService *compute.Service) (*compute.Operation, error) {

    instance := &compute.Instance{
        Name: InstanceName,
        MachineType: fmt.Sprintf("zones/%s/machineTypes/%s", Zone, InstanceType),
        NetworkInterfaces: []*compute.NetworkInterface{
            {
                Name:       "default",
                Subnetwork: fmt.Sprintf("projects/%s/regions/%s/subnetworks/default", ProjectID, Region),
                AccessConfigs: []*compute.AccessConfig{
                    {
                        Name:        "External NAT",
                        Type:        "ONE_TO_ONE_NAT",
                        NetworkTier: "PREMIUM",
                    },
                },
            },
        },
        Scheduling: &compute.Scheduling{
            Preemptible: true,
        },
        Disks: []*compute.AttachedDisk{
            {
                Boot:       true,         // The first disk must be a boot disk.
                AutoDelete: true,         //Optional
                Mode:       "READ_WRITE", //Mode should be READ_WRITE or READ_ONLY
                Interface:  "SCSI",       //SCSI or NVME - NVME only for SSDs
                InitializeParams: &compute.AttachedDiskInitializeParams{
                    DiskName: "worker-instance-boot-disk",
                    SourceImage: "projects/centos-cloud/global/images/family/centos-7",
                    DiskType:    fmt.Sprintf("projects/%s/zones/%s/diskTypes/pd-ssd", ProjectID, Zone),
                    DiskSizeGb:  200,
                },
            },
        },
    }
    return computeService.Instances.Insert(ProjectID, Zone, instance).Do()
}

// startInstance is a wrapper function for the switch statement
func startInstance(cs *compute.Service, w http.ResponseWriter) {
    operation, err := StartInstance(cs)
    if err != nil {
        w.WriteHeader(http.StatusInternalServerError)
        log.Fatal(err)
    }
    w.WriteHeader(http.StatusOK)
    data, _ := operation.MarshalJSON()
    w.Write(data)

}