Golang Host.Remove方法代码示例

// terminate an instance
func (staticMgr *StaticManager) TerminateInstance(host *host.Host) error {
	// a decommissioned static host will be removed from the database
	if host.Status == evergreen.HostDecommissioned {
		evergreen.Logger.Logf(slogger.DEBUG, "Removing decommissioned %v "+
			"static host (%v)", host.Distro, host.Host)
		if err := host.Remove(); err != nil {
			evergreen.Logger.Errorf(slogger.ERROR, "Error removing "+
				"decommissioned %v static host (%v): %v",
				host.Distro, host.Host, err)
		}
	}
	evergreen.Logger.Logf(slogger.DEBUG, "Not terminating static %v host: %v", host.Distro, host.Host)
	return nil
}

func startEC2Instance(ec2Handle *ec2.EC2, options *ec2.RunInstancesOptions,
	intentHost *host.Host) (*host.Host, *ec2.RunInstancesResp, error) {
	// start the instance
	resp, err := ec2Handle.RunInstances(options)

	if err != nil {
		// remove the intent host document
		rmErr := intentHost.Remove()
		if rmErr != nil {
			evergreen.Logger.Errorf(slogger.ERROR, "Could not remove intent host "+
				"“%v”: %v", intentHost.Id, rmErr)
		}
		return nil, nil, evergreen.Logger.Errorf(slogger.ERROR,
			"EC2 RunInstances API call returned error: %v", err)
	}

	evergreen.Logger.Logf(slogger.DEBUG, "Spawned %v instance", len(resp.Instances))

	// the instance should have been successfully spawned
	instance := resp.Instances[0]
	evergreen.Logger.Logf(slogger.DEBUG, "Started %v", instance.InstanceId)
	evergreen.Logger.Logf(slogger.DEBUG, "Key name: %v", string(options.KeyName))

	// find old intent host
	host, err := host.FindOne(host.ById(intentHost.Id))
	if host == nil {
		return nil, nil, evergreen.Logger.Errorf(slogger.ERROR, "Can't locate "+
			"record inserted for intended host “%v”", intentHost.Id)
	}
	if err != nil {
		return nil, nil, evergreen.Logger.Errorf(slogger.ERROR, "Can't locate "+
			"record inserted for intended host “%v” due to error: %v",
			intentHost.Id, err)
	}

	// we found the old document now we can insert the new one
	host.Id = instance.InstanceId
	err = host.Insert()
	if err != nil {
		return nil, nil, evergreen.Logger.Errorf(slogger.ERROR, "Could not insert "+
			"updated host information for “%v” with “%v”: %v", intentHost.Id,
			host.Id, err)
	}

	// remove the intent host document
	err = intentHost.Remove()
	if err != nil {
		return nil, nil, evergreen.Logger.Errorf(slogger.ERROR, "Could not remove "+
			"insert host “%v” (replaced by “%v”): %v", intentHost.Id, host.Id,
			err)
	}

	var infoResp *ec2.DescribeInstancesResp
	instanceInfoRetryCount := 0
	instanceInfoMaxRetries := 5
	for {
		infoResp, err = ec2Handle.DescribeInstances([]string{instance.InstanceId}, nil)
		if err != nil {
			instanceInfoRetryCount++
			if instanceInfoRetryCount == instanceInfoMaxRetries {
				evergreen.Logger.Errorf(slogger.ERROR, "There was an error querying for the "+
					"instance's information and retries are exhausted. The insance may "+
					"be up.")
				return nil, resp, err
			}

			evergreen.Logger.Errorf(slogger.DEBUG, "There was an error querying for the "+
				"instance's information. Retrying in 30 seconds. Error: %v", err)
			time.Sleep(30 * time.Second)
			continue
		}
		break
	}

	reservations := infoResp.Reservations
	if len(reservations) < 1 {
		return nil, resp, fmt.Errorf("Reservation was returned as nil, you " +
			"may have to check manually")
	}

	instancesInfo := reservations[0].Instances
	if len(instancesInfo) < 1 {
		return nil, resp, fmt.Errorf("Reservation appears to have no " +
			"associated instances")
	}
	return host, resp, nil
}