packer-plugin-xenserver/builder/xenserver/common/client.go

package common

import (
	"encoding/xml"
	"errors"
	"fmt"
	"log"

	xmlrpc "github.com/amfranz/go-xmlrpc-client"
	xenapi "github.com/terra-farm/go-xen-api-client"
)

type XenAPIClient struct {
	Session  interface{}
	Host     string
	Url      string
	Username string
	Password string
	RPC      *xmlrpc.Client
}

type APIResult struct {
	Status           string
	Value            interface{}
	ErrorDescription string
}

type XenAPIObject struct {
	Ref    string
	Client *XenAPIClient
}

type Host XenAPIObject
type VM XenAPIObject
type SR XenAPIObject
type VDI XenAPIObject
type Network XenAPIObject
type VBD XenAPIObject
type VIF XenAPIObject
type PIF XenAPIObject
type Pool XenAPIObject
type Task XenAPIObject

type VDIType int

const (
	_ VDIType = iota
	Disk
	CD
	Floppy
)

type TaskStatusType int

const (
	_ TaskStatusType = iota
	Pending
	Success
	Failure
	Cancelling
	Cancelled
)

func (c *XenAPIClient) RPCCall(result interface{}, method string, params []interface{}) (err error) {
	fmt.Println(params)
	p := xmlrpc.Params{Params: params}
	err = c.RPC.Call(method, p, result)
	return err
}

func (client *XenAPIClient) Login() (err error) {
	//Do loging call
	result := xmlrpc.Struct{}

	params := make([]interface{}, 2)
	params[0] = client.Username
	params[1] = client.Password

	err = client.RPCCall(&result, "session.login_with_password", params)
	client.Session = result["Value"]
	return err
}

func (client *XenAPIClient) APICall(result *APIResult, method string, params ...interface{}) (err error) {
	if client.Session == nil {
		fmt.Println("Error: no session")
		return fmt.Errorf("No session. Unable to make call")
	}

	//Make a params slice which will include the session
	p := make([]interface{}, len(params)+1)
	p[0] = client.Session

	if params != nil {
		for idx, element := range params {
			p[idx+1] = element
		}
	}

	res := xmlrpc.Struct{}

	err = client.RPCCall(&res, method, p)

	if err != nil {
		return err
	}

	result.Status = res["Status"].(string)

	if result.Status != "Success" {
		fmt.Println("Encountered an API error: ", result.Status)
		fmt.Println(res["ErrorDescription"])
		return fmt.Errorf("API Error: %s", res["ErrorDescription"])
	} else {
		result.Value = res["Value"]
	}
	return
}

func (client *XenAPIClient) GetHosts() (hosts []*Host, err error) {
	hosts = make([]*Host, 0)
	result := APIResult{}
	_ = client.APICall(&result, "host.get_all")
	for _, elem := range result.Value.([]interface{}) {
		host := new(Host)
		host.Ref = elem.(string)
		host.Client = client
		hosts = append(hosts, host)
	}
	return
}

func (client *XenAPIClient) GetPools() (pools []*Pool, err error) {
	pools = make([]*Pool, 0)
	result := APIResult{}
	err = client.APICall(&result, "pool.get_all")
	if err != nil {
		return pools, err
	}

	for _, elem := range result.Value.([]interface{}) {
		pool := new(Pool)
		pool.Ref = elem.(string)
		pool.Client = client
		pools = append(pools, pool)
	}

	return pools, nil
}

func (client *XenAPIClient) GetDefaultSR() (sr *SR, err error) {
	pools, err := client.GetPools()

	if err != nil {
		return nil, err
	}

	pool_rec, err := pools[0].GetRecord()

	if err != nil {
		return nil, err
	}

	if pool_rec["default_SR"] == "" {
		return nil, errors.New("No default_SR specified for the pool.")
	}

	sr = new(SR)
	sr.Ref = pool_rec["default_SR"].(string)
	sr.Client = client

	return sr, nil
}

func (client *XenAPIClient) GetVMByUuid(vm_uuid string) (vm *VM, err error) {
	vm = new(VM)
	result := APIResult{}
	err = client.APICall(&result, "VM.get_by_uuid", vm_uuid)
	if err != nil {
		return nil, err
	}
	vm.Ref = result.Value.(string)
	vm.Client = client
	return
}

func (client *XenAPIClient) GetVMByNameLabel(name_label string) (vms []*VM, err error) {
	vms = make([]*VM, 0)
	result := APIResult{}
	err = client.APICall(&result, "VM.get_by_name_label", name_label)
	if err != nil {
		return vms, err
	}

	for _, elem := range result.Value.([]interface{}) {
		vm := new(VM)
		vm.Ref = elem.(string)
		vm.Client = client
		vms = append(vms, vm)
	}

	return vms, nil
}

func (client *XenAPIClient) GetNetworkByUuid(network_uuid string) (network *Network, err error) {
	network = new(Network)
	result := APIResult{}
	err = client.APICall(&result, "network.get_by_uuid", network_uuid)
	if err != nil {
		return nil, err
	}
	network.Ref = result.Value.(string)
	network.Client = client
	return
}

func (client *XenAPIClient) GetNetworkByNameLabel(name_label string) (networks []*Network, err error) {
	networks = make([]*Network, 0)
	result := APIResult{}
	err = client.APICall(&result, "network.get_by_name_label", name_label)
	if err != nil {
		return networks, err
	}

	for _, elem := range result.Value.([]interface{}) {
		network := new(Network)
		network.Ref = elem.(string)
		network.Client = client
		networks = append(networks, network)
	}

	return networks, nil
}

func (client *XenAPIClient) GetVdiByNameLabel(name_label string) (vdis []*VDI, err error) {
	vdis = make([]*VDI, 0)
	result := APIResult{}
	err = client.APICall(&result, "VDI.get_by_name_label", name_label)
	if err != nil {
		return vdis, err
	}

	for _, elem := range result.Value.([]interface{}) {
		vdi := new(VDI)
		vdi.Ref = elem.(string)
		vdi.Client = client
		vdis = append(vdis, vdi)
	}

	return vdis, nil
}

func (client *XenAPIClient) GetVdiByUuid(vdi_uuid string) (vdi *VDI, err error) {
	vdi = new(VDI)
	result := APIResult{}
	err = client.APICall(&result, "VDI.get_by_uuid", vdi_uuid)
	if err != nil {
		return nil, err
	}
	vdi.Ref = result.Value.(string)
	vdi.Client = client
	return
}

func (client *XenAPIClient) GetPIFs() (pifs []*PIF, err error) {
	pifs = make([]*PIF, 0)
	result := APIResult{}
	err = client.APICall(&result, "PIF.get_all")
	if err != nil {
		return pifs, err
	}
	for _, elem := range result.Value.([]interface{}) {
		pif := new(PIF)
		pif.Ref = elem.(string)
		pif.Client = client
		pifs = append(pifs, pif)
	}

	return pifs, nil
}

// Host associated functions

func (self *Host) GetSoftwareVersion() (versions map[string]interface{}, err error) {
	versions = make(map[string]interface{})

	result := APIResult{}
	err = self.Client.APICall(&result, "host.get_software_version", self.Ref)
	if err != nil {
		return nil, err
	}

	for k, v := range result.Value.(xmlrpc.Struct) {
		versions[k] = v.(string)
	}
	return
}

func (self *Host) CallPlugin(plugin, function string, args map[string]string) (res string, err error) {

	args_rec := make(xmlrpc.Struct)
	for key, value := range args {
		args_rec[key] = value
	}

	result := APIResult{}
	err = self.Client.APICall(&result, "host.call_plugin", self.Ref, plugin, function, args_rec)
	if err != nil {
		return "", err
	}

	// The plugin should return a string value
	res = result.Value.(string)
	return
}

// VM associated functions

func (self *VM) Clone(label string) (new_instance *VM, err error) {
	new_instance = new(VM)

	result := APIResult{}
	err = self.Client.APICall(&result, "VM.clone", self.Ref, label)
	if err != nil {
		return nil, err
	}
	new_instance.Ref = result.Value.(string)
	new_instance.Client = self.Client
	return
}

func (self *VM) Destroy() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.destroy", self.Ref)
	if err != nil {
		return err
	}
	return
}

func (self *VM) Start(paused, force bool) (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.start", self.Ref, paused, force)
	if err != nil {
		return err
	}
	return
}

func (self *VM) CleanShutdown() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.clean_shutdown", self.Ref)
	if err != nil {
		return err
	}
	return
}

func Unpause(c *Connection, vmRef xenapi.VMRef) (err error) {
	err = c.client.VM.Unpause(c.session, vmRef)
	if err != nil {
		return err
	}
	return
}

func (self *VM) SetHVMBoot(policy, bootOrder string) (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.set_HVM_boot_policy", self.Ref, policy)
	if err != nil {
		return err
	}
	result = APIResult{}
	params := make(xmlrpc.Struct)
	params["order"] = bootOrder
	err = self.Client.APICall(&result, "VM.set_HVM_boot_params", self.Ref, params)
	if err != nil {
		return err
	}
	return
}

func (self *VM) SetPVBootloader(pv_bootloader, pv_args string) (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.set_PV_bootloader", self.Ref, pv_bootloader)
	if err != nil {
		return err
	}
	result = APIResult{}
	err = self.Client.APICall(&result, "VM.set_PV_bootloader_args", self.Ref, pv_args)
	if err != nil {
		return err
	}
	return
}

func (self *VM) GetDomainId() (domid string, err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.get_domid", self.Ref)
	if err != nil {
		return "", err
	}
	domid = result.Value.(string)
	return domid, nil
}

func (self *VM) GetPowerState() (state string, err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.get_power_state", self.Ref)
	if err != nil {
		return "", err
	}
	state = result.Value.(string)
	return state, nil
}

func (self *VM) GetUuid() (uuid string, err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.get_uuid", self.Ref)
	if err != nil {
		return "", err
	}
	uuid = result.Value.(string)
	return uuid, nil
}

func (self *VM) GetVBDs() (vbds []VBD, err error) {
	vbds = make([]VBD, 0)
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.get_VBDs", self.Ref)
	if err != nil {
		return vbds, err
	}
	for _, elem := range result.Value.([]interface{}) {
		vbd := VBD{}
		vbd.Ref = elem.(string)
		vbd.Client = self.Client
		vbds = append(vbds, vbd)
	}

	return vbds, nil
}

func GetDisks(c *Connection, vmRef xenapi.VMRef) (vdis []xenapi.VDIRef, err error) {
	// Return just data disks (non-isos)
	vdis = make([]xenapi.VDIRef, 0)
	vbds, err := c.client.VM.GetVBDs(c.session, vmRef)
	if err != nil {
		return nil, err
	}

	for _, vbd := range vbds {
		rec, err := c.client.VBD.GetRecord(c.session, vbd)
		if err != nil {
			return nil, err
		}
		if rec.Type == "Disk" {

			vdi, err := c.client.VBD.GetVDI(c.session, vbd)
			if err != nil {
				return nil, err
			}
			vdis = append(vdis, vdi)

		}
	}
	return vdis, nil
}

func (self *VM) GetGuestMetricsRef() (ref string, err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.get_guest_metrics", self.Ref)
	if err != nil {
		return "", nil
	}
	ref = result.Value.(string)
	return ref, err
}

func (self *VM) GetGuestMetrics() (metrics map[string]interface{}, err error) {
	metrics_ref, err := self.GetGuestMetricsRef()
	if err != nil {
		return nil, err
	}
	if metrics_ref == "OpaqueRef:NULL" {
		return nil, nil
	}

	result := APIResult{}
	err = self.Client.APICall(&result, "VM_guest_metrics.get_record", metrics_ref)
	if err != nil {
		return nil, err
	}
	return result.Value.(xmlrpc.Struct), nil
}

func (self *VM) SetStaticMemoryRange(min, max uint) (err error) {
	result := APIResult{}
	strMin := fmt.Sprintf("%d", min)
	strMax := fmt.Sprintf("%d", max)
	err = self.Client.APICall(&result, "VM.set_memory_limits", self.Ref, strMin, strMax, strMin, strMax)
	if err != nil {
		return err
	}
	return
}

func ConnectVdi(c *Connection, vmRef xenapi.VMRef, vdiRef xenapi.VDIRef, vbdType xenapi.VbdType) (err error) {

	var mode xenapi.VbdMode
	var unpluggable bool
	var bootable bool
	var t xenapi.VbdType
	switch vbdType {
	case xenapi.VbdTypeCD:
		mode = xenapi.VbdModeRO
		bootable = true
		unpluggable = false
		t = xenapi.VbdTypeCD
	case xenapi.VbdTypeDisk:
		mode = xenapi.VbdModeRW
		bootable = false
		unpluggable = false
		t = xenapi.VbdTypeDisk
	case xenapi.VbdTypeFloppy:
		mode = xenapi.VbdModeRW
		bootable = false
		unpluggable = true
		t = xenapi.VbdTypeFloppy
	}

	vbd_ref, err := c.client.VBD.Create(c.session, xenapi.VBDRecord{
		VM:         xenapi.VMRef(vmRef),
		VDI:        xenapi.VDIRef(vdiRef),
		Userdevice: "autodetect",
		Empty:      false,
		// OtherConfig: map[string]interface{{}},
		QosAlgorithmType: "",
		// QosAlgorithmParams: map[string]interface{{}},
		Mode:        mode,
		Unpluggable: unpluggable,
		Bootable:    bootable,
		Type:        t,
	})

	if err != nil {
		return err
	}

	fmt.Println("VBD Ref:", vbd_ref)

	uuid, err := c.client.VBD.GetUUID(c.session, vbd_ref)

	fmt.Println("VBD UUID: ", uuid)
	/*
	   // 2. Plug VBD (Non need - the VM hasn't booted.
	   // @todo - check VM state
	   result = APIResult{}
	   err = self.Client.APICall(&result, "VBD.plug", vbd_ref)

	   if err != nil {
	       return err
	   }
	*/
	return
}

func DisconnectVdi(c *Connection, vmRef xenapi.VMRef, vdi xenapi.VDIRef) error {
	vbds, err := c.client.VM.GetVBDs(c.session, vmRef)
	if err != nil {
		return fmt.Errorf("Unable to get VM VBDs: %s", err.Error())
	}

	for _, vbd := range vbds {
		rec, err := c.client.VBD.GetRecord(c.session, vbd)
		if err != nil {
			return fmt.Errorf("Could not get record for VBD '%s': %s", vbd, err.Error())
		}
		recVdi := rec.VDI
		if recVdi == vdi {
			_ = c.client.VBD.Unplug(c.session, vbd)
			err = c.client.VBD.Destroy(c.session, vbd)
			if err != nil {
				return fmt.Errorf("Could not destroy VBD '%s': %s", vbd, err.Error())
			}

			return nil
		} else {
			log.Printf("Could not find VDI record in VBD '%s'", vbd)
		}
	}

	return fmt.Errorf("Could not find VBD for VDI '%s'", vdi)
}

func (self *VM) SetPlatform(params map[string]string) (err error) {
	result := APIResult{}
	platform_rec := make(xmlrpc.Struct)
	for key, value := range params {
		platform_rec[key] = value
	}

	err = self.Client.APICall(&result, "VM.set_platform", self.Ref, platform_rec)

	if err != nil {
		return err
	}
	return
}

func ConnectNetwork(c *Connection, networkRef xenapi.NetworkRef, vmRef xenapi.VMRef, device string) (*xenapi.VIFRef, error) {
	vif, err := c.client.VIF.Create(c.session, xenapi.VIFRecord{
		Network:     networkRef,
		VM:          vmRef,
		Device:      device,
		LockingMode: xenapi.VifLockingModeNetworkDefault,
	})

	if err != nil {
		return nil, err
	}
	log.Printf("Created the following VIF: %s", vif)

	return &vif, nil
}

//      Setters

func (self *VM) SetIsATemplate(is_a_template bool) (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VM.set_is_a_template", self.Ref, is_a_template)
	if err != nil {
		return err
	}
	return
}

// SR associated functions

func (self *SR) CreateVdi(name_label string, size int64) (vdi *VDI, err error) {
	vdi = new(VDI)

	vdi_rec := make(xmlrpc.Struct)
	vdi_rec["name_label"] = name_label
	vdi_rec["SR"] = self.Ref
	vdi_rec["virtual_size"] = fmt.Sprintf("%d", size)
	vdi_rec["type"] = "user"
	vdi_rec["sharable"] = false
	vdi_rec["read_only"] = false

	oc := make(xmlrpc.Struct)
	oc["temp"] = "temp"
	vdi_rec["other_config"] = oc

	result := APIResult{}
	err = self.Client.APICall(&result, "VDI.create", vdi_rec)
	if err != nil {
		return nil, err
	}

	vdi.Ref = result.Value.(string)
	vdi.Client = self.Client

	return
}

// Network associated functions

func (self *Network) GetAssignedIPs() (ip_map map[string]string, err error) {
	ip_map = make(map[string]string, 0)
	result := APIResult{}
	err = self.Client.APICall(&result, "network.get_assigned_ips", self.Ref)
	if err != nil {
		return ip_map, err
	}
	for k, v := range result.Value.(xmlrpc.Struct) {
		ip_map[k] = v.(string)
	}
	return ip_map, nil
}

// PIF associated functions

func (self *PIF) GetRecord() (record map[string]interface{}, err error) {
	record = make(map[string]interface{})
	result := APIResult{}
	err = self.Client.APICall(&result, "PIF.get_record", self.Ref)
	if err != nil {
		return record, err
	}
	for k, v := range result.Value.(xmlrpc.Struct) {
		record[k] = v
	}
	return record, nil
}

// Pool associated functions

func (self *Pool) GetRecord() (record map[string]interface{}, err error) {
	record = make(map[string]interface{})
	result := APIResult{}
	err = self.Client.APICall(&result, "pool.get_record", self.Ref)
	if err != nil {
		return record, err
	}
	for k, v := range result.Value.(xmlrpc.Struct) {
		record[k] = v
	}
	return record, nil
}

// VBD associated functions
func (self *VBD) GetRecord() (record map[string]interface{}, err error) {
	record = make(map[string]interface{})
	result := APIResult{}
	err = self.Client.APICall(&result, "VBD.get_record", self.Ref)
	if err != nil {
		return record, err
	}
	for k, v := range result.Value.(xmlrpc.Struct) {
		record[k] = v
	}
	return record, nil
}

func (self *VBD) GetVDI() (vdi *VDI, err error) {
	vbd_rec, err := self.GetRecord()
	if err != nil {
		return nil, err
	}

	vdi = new(VDI)
	vdi.Ref = vbd_rec["VDI"].(string)
	vdi.Client = self.Client

	return vdi, nil
}

func (self *VBD) Eject() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VBD.eject", self.Ref)
	if err != nil {
		return err
	}
	return nil
}

func (self *VBD) Unplug() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VBD.unplug", self.Ref)
	if err != nil {
		return err
	}
	return nil
}

func (self *VBD) Destroy() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VBD.destroy", self.Ref)
	if err != nil {
		return err
	}
	return nil
}

// VIF associated functions

func (self *VIF) Destroy() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VIF.destroy", self.Ref)
	if err != nil {
		return err
	}
	return nil
}

// VDI associated functions

func (self *VDI) GetUuid() (vdi_uuid string, err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VDI.get_uuid", self.Ref)
	if err != nil {
		return "", err
	}
	vdi_uuid = result.Value.(string)
	return vdi_uuid, nil
}

func (self *VDI) GetVBDs() (vbds []VBD, err error) {
	vbds = make([]VBD, 0)
	result := APIResult{}
	err = self.Client.APICall(&result, "VDI.get_VBDs", self.Ref)
	if err != nil {
		return vbds, err
	}
	for _, elem := range result.Value.([]interface{}) {
		vbd := VBD{}
		vbd.Ref = elem.(string)
		vbd.Client = self.Client
		vbds = append(vbds, vbd)
	}

	return vbds, nil
}

func (self *VDI) Destroy() (err error) {
	result := APIResult{}
	err = self.Client.APICall(&result, "VDI.destroy", self.Ref)
	if err != nil {
		return err
	}
	return
}

// Expose a VDI using the Transfer VM
// (Legacy VHD export)

type TransferRecord struct {
	UrlFull string `xml:"url_full,attr"`
}

func Expose(c *Connection, vdiRef xenapi.VDIRef, format string) (url string, err error) {

	hosts, err := c.client.Host.GetAll(c.session)

	if err != nil {
		err = errors.New(fmt.Sprintf("Could not retrieve hosts in the pool: %s", err.Error()))
		return "", err
	}
	host := hosts[0]

	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to get VDI uuid for %s: %s", vdiRef, err.Error()))
		return "", err
	}

	args := make(map[string]string)
	args["transfer_mode"] = "http"
	args["vdi_uuid"] = string(vdiRef)
	args["expose_vhd"] = "true"
	args["network_uuid"] = "management"
	args["timeout_minutes"] = "5"

	handle, err := c.client.Host.CallPlugin(c.session, host, "transfer", "expose", args)

	if err != nil {
		err = errors.New(fmt.Sprintf("Error whilst exposing VDI %s: %s", vdiRef, err.Error()))
		return "", err
	}

	args = make(map[string]string)
	args["record_handle"] = handle
	record_xml, err := c.client.Host.CallPlugin(c.session, host, "transfer", "get_record", args)

	if err != nil {
		err = errors.New(fmt.Sprintf("Unable to retrieve transfer record for VDI %s: %s", vdiRef, err.Error()))
		return "", err
	}

	var record TransferRecord
	xml.Unmarshal([]byte(record_xml), &record)

	if record.UrlFull == "" {
		return "", errors.New(fmt.Sprintf("Error: did not parse XML properly: '%s'", record_xml))
	}

	// Handles either raw or VHD formats

	switch format {
	case "vhd":
		url = fmt.Sprintf("%s.vhd", record.UrlFull)

	case "raw":
		url = record.UrlFull
	}

	return
}

func Unexpose(c *Connection, vdiRef xenapi.VDIRef) (err error) {

	disk_uuid, err := c.client.VDI.GetUUID(c.session, vdiRef)

	if err != nil {
		return err
	}

	hosts, err := c.client.Host.GetAll(c.session)

	if err != nil {
		err = errors.New(fmt.Sprintf("Could not retrieve hosts in the pool: %s", err.Error()))
		return err
	}

	host := hosts[0]

	args := make(map[string]string)
	args["vdi_uuid"] = disk_uuid

	result, err := c.client.Host.CallPlugin(c.session, host, "transfer", "unexpose", args)

	if err != nil {
		return err
	}

	log.Println(fmt.Sprintf("Unexpose result: %s", result))

	return nil
}

// Task associated functions

// func (self *Task) GetResult() (object *XenAPIObject, err error) {
// 	result := APIResult{}
// 	err = self.Client.APICall(&result, "task.get_result", self.Ref)
// 	if err != nil {
// 		return
// 	}
// 	switch ref := result.Value.(type) {
// 	case string:
// 		// @fixme: xapi currently sends us an xmlrpc-encoded string via xmlrpc.
// 		// This seems to be a bug in xapi. Remove this workaround when it's fixed
// 		re := regexp.MustCompile("^<value><array><data><value>([^<]*)</value>.*</data></array></value>$")
// 		match := re.FindStringSubmatch(ref)
// 		if match == nil {
// 			object = nil
// 		} else {
// 			object = &XenAPIObject{
// 				Ref:    match[1],
// 				Client: self.Client,
// 			}
// 		}
// 	case nil:
// 		object = nil
// 	default:
// 		err = fmt.Errorf("task.get_result: unknown value type %T (expected string or nil)", ref)
// 	}
// 	return
// }

// Client Initiator
type Connection struct {
	client   *xenapi.Client
	session  xenapi.SessionRef
	Host     string
	Username string
	Password string
}

func (c Connection) GetSession() string {
	return string(c.session)
}

func NewXenAPIClient(host, username, password string) (*Connection, error) {
	client, err := xenapi.NewClient("https://"+host, nil)
	if err != nil {
		return nil, err
	}

	session, err := client.Session.LoginWithPassword(username, password, "1.0", "packer")
	if err != nil {
		return nil, err
	}

	return &Connection{client, session, host, username, password}, nil
}

func (c *Connection) GetClient() *xenapi.Client {
	return c.client
}

func (c *Connection) GetSessionRef() xenapi.SessionRef {
	return c.session
}