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package libvirt
import (
"encoding/json"
"log"
"strings"
"time"
"github.com/hashicorp/terraform/helper/resource"
libvirt "github.com/libvirt/libvirt-go"
)
// QemuAgentInterfacesResponse type
type QemuAgentInterfacesResponse struct {
Interfaces []QemuAgentInterface `json:"return"`
}
// QemuAgentInterface type
type QemuAgentInterface struct {
Name string `json:"name"`
Hwaddr string `json:"hardware-address"`
IPAddresses []QemuAgentInterfaceIPAddress `json:"ip-addresses"`
}
// QemuAgentInterfaceIPAddress type
type QemuAgentInterfaceIPAddress struct {
Type string `json:"ip-address-type"`
Address string `json:"ip-address"`
Prefix uint `json:"prefix"`
}
func qemuAgentInterfacesRefreshFunc(domain LibVirtDomain, wait4ipv4 bool) resource.StateRefreshFunc {
return func() (interface{}, string, error) {
var interfaces []libvirt.DomainInterface
log.Printf("[DEBUG] sending command to qemu-agent in %s", domain)
result, err := domain.QemuAgentCommand(
"{\"execute\":\"guest-network-get-interfaces\"}",
libvirt.DOMAIN_QEMU_AGENT_COMMAND_DEFAULT,
0)
if err != nil {
log.Printf("[DEBUG] command error: %s", err)
return interfaces, "failed", nil
}
log.Printf("[DEBUG] qemu-agent response: %s", result)
response := QemuAgentInterfacesResponse{}
if err := json.Unmarshal([]byte(result), &response); err != nil {
log.Printf("[DEBUG] Error converting qemu-agent response about domain interfaces: %s", err)
log.Printf("[DEBUG] Original message: %s", response)
log.Print("[DEBUG] Returning an empty list of interfaces")
return interfaces, "fatal", nil
}
log.Printf("[DEBUG] Parsed response %+v", response)
for _, iface := range response.Interfaces {
if iface.Name == "lo" {
// ignore loopback interface
continue
}
libVirtIface := libvirt.DomainInterface{
Name: iface.Name,
Hwaddr: iface.Hwaddr}
ipv4Assigned := false
for _, addr := range iface.IpAddresses {
if addr.Address == "" {
// ignore interfaces without an address (eg. waiting for dhcp lease)
continue
}
libVirtAddr := libvirt.DomainIPAddress{
Addr: addr.Address,
Prefix: addr.Prefix,
}
switch strings.ToLower(addr.Type) {
case "ipv4":
libVirtAddr.Type = int(libvirt.IP_ADDR_TYPE_IPV4)
ipv4Assigned = true
case "ipv6":
libVirtAddr.Type = int(libvirt.IP_ADDR_TYPE_IPV6)
default:
log.Printf("[ERROR] Cannot handle unknown address type %s", addr.Type)
continue
}
libVirtIface.Addrs = append(libVirtIface.Addrs, libVirtAddr)
}
if len(libVirtIface.Addrs) > 0 && (ipv4Assigned || !wait4ipv4) {
interfaces = append(interfaces, libVirtIface)
}
}
log.Printf("[DEBUG] Interfaces obtained via qemu-agent: %+v", interfaces)
return interfaces, "success", nil
}
}
// Retrieve all the interfaces attached to a domain and their addresses. Only
// the interfaces with at least an IP address are returned.
// When wait4ipv4 is turned on the code will not report interfaces that don't
// have a ipv4 address set. This is useful when a domain gets the ipv6 address
// before the ipv4 one.
func getDomainInterfacesViaQemuAgent(domain LibVirtDomain, wait4ipv4 bool) []libvirt.DomainInterface {
qemuAgentQuery := &resource.StateChangeConf{
Pending: []string{"failed"},
Target: []string{"success"},
Refresh: qemuAgentInterfacesRefreshFunc(domain, wait4ipv4),
MinTimeout: 4 * time.Second,
Delay: 4 * time.Second, // Wait this time before starting checks
Timeout: 16 * time.Second,
}
interfaces, err := qemuAgentQuery.WaitForState()
if err != nil {
return []libvirt.DomainInterface{}
}
return interfaces.([]libvirt.DomainInterface)
}
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