102 lines
3.2 KiB
Go
102 lines
3.2 KiB
Go
package arm
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// Code to resolve resources that are required by the API. These resources
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// can most likely be resolved without asking the user, thereby reducing the
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// amount of configuration they need to provide.
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//
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// Resource resolver differs from config retriever because resource resolver
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// requires a client to communicate with the Azure API. A config retriever is
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// used to determine values without use of a client.
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import (
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"fmt"
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"strings"
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)
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type resourceResolver struct {
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client *AzureClient
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findVirtualNetworkResourceGroup func(*AzureClient, string) (string, error)
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findVirtualNetworkSubnet func(*AzureClient, string, string) (string, error)
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}
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func newResourceResolver(client *AzureClient) *resourceResolver {
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return &resourceResolver{
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client: client,
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findVirtualNetworkResourceGroup: findVirtualNetworkResourceGroup,
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findVirtualNetworkSubnet: findVirtualNetworkSubnet,
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}
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}
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func (s *resourceResolver) Resolve(c *Config) error {
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if s.shouldResolveResourceGroup(c) {
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resourceGroupName, err := s.findVirtualNetworkResourceGroup(s.client, c.VirtualNetworkName)
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if err != nil {
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return err
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}
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subnetName, err := s.findVirtualNetworkSubnet(s.client, resourceGroupName, c.VirtualNetworkName)
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if err != nil {
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return err
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}
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c.VirtualNetworkResourceGroupName = resourceGroupName
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c.VirtualNetworkSubnetName = subnetName
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}
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return nil
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}
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func (s *resourceResolver) shouldResolveResourceGroup(c *Config) bool {
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return c.VirtualNetworkName != "" && c.VirtualNetworkResourceGroupName == ""
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}
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func getResourceGroupNameFromId(id string) string {
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// "/subscriptions/3f499422-dd76-4114-8859-86d526c9deb6/resourceGroups/packer-Resource-Group-yylnwsl30j/providers/...
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xs := strings.Split(id, "/")
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return xs[4]
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}
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func findVirtualNetworkResourceGroup(client *AzureClient, name string) (string, error) {
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virtualNetworks, err := client.VirtualNetworksClient.ListAll()
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if err != nil {
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return "", err
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}
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resourceGroupNames := make([]string, 0)
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for _, virtualNetwork := range *virtualNetworks.Value {
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if strings.EqualFold(name, *virtualNetwork.Name) {
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rgn := getResourceGroupNameFromId(*virtualNetwork.ID)
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resourceGroupNames = append(resourceGroupNames, rgn)
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}
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}
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if len(resourceGroupNames) == 0 {
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return "", fmt.Errorf("Cannot find a resource group with a virtual network called %q", name)
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}
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if len(resourceGroupNames) > 1 {
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return "", fmt.Errorf("Found multiple resource groups with a virtual network called %q, please use virtual_network_resource_group_name to disambiguate", name)
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}
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return resourceGroupNames[0], nil
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}
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func findVirtualNetworkSubnet(client *AzureClient, resourceGroupName string, name string) (string, error) {
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subnets, err := client.SubnetsClient.List(resourceGroupName, name)
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if err != nil {
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return "", err
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}
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if len(*subnets.Value) == 0 {
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return "", fmt.Errorf("Cannot find a subnet in the resource group %q associated with the virtual network called %q", resourceGroupName, name)
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}
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if len(*subnets.Value) > 1 {
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return "", fmt.Errorf("Found multiple subnets in the resource group %q associated with the virtual network called %q, please use virtual_network_subnet_name to disambiguate", resourceGroupName, name)
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}
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subnet := (*subnets.Value)[0]
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return *subnet.Name, nil
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}
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