// nextSubnetIPAddress returns the next available IP address in the given subnet.
func nextSubnetIPAddress(
nicClient network.InterfacesClient,
resourceGroup string,
subnet *network.Subnet,
) (string, error) {
_, ipnet, err := net.ParseCIDR(to.String(subnet.Properties.AddressPrefix))
if err != nil {
return "", errors.Annotate(err, "parsing subnet prefix")
}
results, err := nicClient.List(resourceGroup)
if err != nil {
return "", errors.Annotate(err, "listing NICs")
}
// Azure reserves the first 4 addresses in the subnet.
var ipsInUse []net.IP
if results.Value != nil {
ipsInUse = make([]net.IP, 0, len(*results.Value))
for _, item := range *results.Value {
if item.Properties.IPConfigurations == nil {
continue
}
for _, ipConfiguration := range *item.Properties.IPConfigurations {
if to.String(ipConfiguration.Properties.Subnet.ID) != to.String(subnet.ID) {
continue
}
ip := net.ParseIP(to.String(ipConfiguration.Properties.PrivateIPAddress))
if ip != nil {
ipsInUse = append(ipsInUse, ip)
}
}
}
}
ip, err := iputils.NextSubnetIP(ipnet, ipsInUse)
if err != nil {
return "", errors.Trace(err)
}
return ip.String(), nil
}
// instanceNetworkInterfaces lists all network interfaces in the resource
// group, and returns a mapping from instance ID to the network interfaces
// associated with that instance.
func instanceNetworkInterfaces(
callAPI callAPIFunc,
resourceGroup string,
nicClient network.InterfacesClient,
) (map[instance.Id][]network.Interface, error) {
var nicsResult network.InterfaceListResult
if err := callAPI(func() (autorest.Response, error) {
var err error
nicsResult, err = nicClient.List(resourceGroup)
return nicsResult.Response, err
}); err != nil {
return nil, errors.Annotate(err, "listing network interfaces")
}
if nicsResult.Value == nil || len(*nicsResult.Value) == 0 {
return nil, nil
}
instanceNics := make(map[instance.Id][]network.Interface)
for _, nic := range *nicsResult.Value {
instanceId := instance.Id(toTags(nic.Tags)[jujuMachineNameTag])
instanceNics[instanceId] = append(instanceNics[instanceId], nic)
}
return instanceNics, nil
}
// allInstances returns all of the instances in the given resource group,
// and optionally ensures that each instance's addresses are up-to-date.
func (env *azureEnviron) allInstances(
resourceGroup string,
refreshAddresses bool,
) ([]instance.Instance, error) {
env.mu.Lock()
vmClient := compute.VirtualMachinesClient{env.compute}
nicClient := network.InterfacesClient{env.network}
pipClient := network.PublicIPAddressesClient{env.network}
env.mu.Unlock()
// Due to how deleting instances works, we have to get creative about
// listing instances. We list NICs and return an instance for each
// unique value of the jujuMachineNameTag tag.
//
// The machine provisioner will call AllInstances so it can delete
// unknown instances. StopInstances must delete VMs before NICs and
// public IPs, because a VM cannot have less than 1 NIC. Thus, we can
// potentially delete a VM but then fail to delete its NIC.
nicsResult, err := nicClient.List(resourceGroup)
if err != nil {
if nicsResult.Response.Response != nil && nicsResult.StatusCode == http.StatusNotFound {
// This will occur if the resource group does not
// exist, e.g. in a fresh hosted environment.
return nil, nil
}
return nil, errors.Trace(err)
}
if nicsResult.Value == nil || len(*nicsResult.Value) == 0 {
return nil, nil
}
// Create an azureInstance for each VM.
result, err := vmClient.List(resourceGroup)
if err != nil {
return nil, errors.Annotate(err, "listing virtual machines")
}
vmNames := make(set.Strings)
var azureInstances []*azureInstance
if result.Value != nil {
azureInstances = make([]*azureInstance, len(*result.Value))
for i, vm := range *result.Value {
inst := &azureInstance{vm, env, nil, nil}
azureInstances[i] = inst
vmNames.Add(to.String(vm.Name))
}
}
// Create additional azureInstances for NICs without machines. See
// comments above for rationale. This needs to happen before calling
// setInstanceAddresses, so we still associate the NICs/PIPs.
for _, nic := range *nicsResult.Value {
vmName, ok := toTags(nic.Tags)[jujuMachineNameTag]
if !ok || vmNames.Contains(vmName) {
continue
}
vm := compute.VirtualMachine{
Name: to.StringPtr(vmName),
Properties: &compute.VirtualMachineProperties{
ProvisioningState: to.StringPtr("Partially Deleted"),
},
}
inst := &azureInstance{vm, env, nil, nil}
azureInstances = append(azureInstances, inst)
vmNames.Add(to.String(vm.Name))
}
if len(azureInstances) > 0 && refreshAddresses {
if err := setInstanceAddresses(
pipClient, resourceGroup, azureInstances, nicsResult,
); err != nil {
return nil, errors.Trace(err)
}
}
instances := make([]instance.Instance, len(azureInstances))
for i, inst := range azureInstances {
instances[i] = inst
}
return instances, nil
}