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host.go
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host.go
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package vm
import (
"fmt"
gonet "net"
bnet "github.com/cppforlife/bosh-virtualbox-cpi/vm/network"
)
type Host struct {
networks bnet.Networks
}
func (h Host) EnableNetworks(nets Networks) error {
for _, net := range nets {
switch net.CloudPropertyType {
case bnet.NATType:
// do nothing
case bnet.NATNetworkType:
err := newHostNetwork(net, natNetworksAdapter{h.networks}).Enable()
if err != nil {
return err
}
case bnet.HostOnlyType:
err := newHostNetwork(net, hostOnlysAdapter{h.networks}).Enable()
if err != nil {
return err
}
default:
return fmt.Errorf("Unknown network type: %s", net.CloudPropertyType)
}
}
return nil
}
type hostNetwork struct {
net Network
adapter netAdapter
triedCreating bool
triedEnabling bool
}
func newHostNetwork(net Network, adapter netAdapter) *hostNetwork {
return &hostNetwork{net: net, adapter: adapter}
}
func (n *hostNetwork) Enable() error {
actualNets, err := n.adapter.List()
if err != nil {
return err
}
for _, actualNet := range actualNets {
if actualNet.Name() == n.net.CloudPropertyName {
if !actualNet.IsEnabled() && !n.triedEnabling {
_ = actualNet.Enable()
n.triedEnabling = true
return n.Enable()
}
return n.verify(actualNet)
}
}
if !n.triedCreating {
err := n.adapter.Create(n.net)
if err != nil {
return err
}
n.triedCreating = true
return n.Enable()
}
return fmt.Errorf("Expected to find network '%s'", n.net.CloudPropertyName)
}
func (n hostNetwork) verify(actualNet bnet.Network) error {
if !actualNet.IsEnabled() {
return fmt.Errorf("Expected %s to %s",
actualNet.Description(), actualNet.EnabledDescription())
}
if len(n.net.IP) == 0 {
if !actualNet.IsDHCPEnabled() {
return fmt.Errorf("Expected %s to have DHCP enabled", actualNet.Description())
}
} else {
ip := gonet.ParseIP(n.net.IP)
if ip == nil {
return fmt.Errorf("Unable to parse IP address '%s' for network '%s'",
n.net.IP, n.net.CloudPropertyName)
}
actualIPNet := actualNet.IPNet()
if !actualIPNet.Contains(ip) {
return fmt.Errorf("Expected IP address '%s' to fit within %s (%s)",
n.net.IP, actualNet.Description(), actualIPNet.String())
}
actualNetmask := gonet.IP(actualIPNet.Mask).String()
if actualNetmask != n.net.Netmask {
return fmt.Errorf("Expected netmask '%s' to match %s netmask '%s'",
n.net.IP, actualNet.Description(), actualNetmask)
}
// todo check gateway
if actualNet.IsDHCPEnabled() {
return fmt.Errorf("Expected %s to not have DHCP enabled", actualNet.Description())
}
}
return nil
}
type netAdapter interface {
List() ([]bnet.Network, error)
Create(net Network) error
}
type natNetworksAdapter struct {
bnet.Networks
}
func (n natNetworksAdapter) List() ([]bnet.Network, error) {
return n.NATNetworks()
}
func (n natNetworksAdapter) Create(net Network) error {
if len(net.IP) > 0 {
return fmt.Errorf("Expected to find NAT Network '%s'", net.CloudPropertyName)
}
return n.AddNATNetwork(net.CloudPropertyName)
}
type hostOnlysAdapter struct {
bnet.Networks
}
func (n hostOnlysAdapter) List() ([]bnet.Network, error) {
return n.HostOnlys()
}
func (n hostOnlysAdapter) Create(net Network) error {
canCreate, err := n.AddHostOnly(net.CloudPropertyName, net.Gateway, net.Netmask)
if err != nil {
return err
} else if !canCreate {
return fmt.Errorf("Expected to find Host-only network '%s'", net.CloudPropertyName)
}
return nil
}