package aws import ( "fmt" "log" "strings" "time" "github.com/awslabs/aws-sdk-go/aws" "github.com/awslabs/aws-sdk-go/aws/awserr" "github.com/awslabs/aws-sdk-go/service/ec2" "github.com/hashicorp/terraform/helper/resource" "github.com/hashicorp/terraform/helper/schema" ) func resourceAwsVpcDhcpOptions() *schema.Resource { return &schema.Resource{ Create: resourceAwsVpcDhcpOptionsCreate, Read: resourceAwsVpcDhcpOptionsRead, Update: resourceAwsVpcDhcpOptionsUpdate, Delete: resourceAwsVpcDhcpOptionsDelete, Schema: map[string]*schema.Schema{ "domain_name": &schema.Schema{ Type: schema.TypeString, Optional: true, ForceNew: true, }, "domain_name_servers": &schema.Schema{ Type: schema.TypeList, Optional: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, }, "ntp_servers": &schema.Schema{ Type: schema.TypeList, Optional: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, }, "netbios_node_type": &schema.Schema{ Type: schema.TypeString, Optional: true, ForceNew: true, }, "netbios_name_servers": &schema.Schema{ Type: schema.TypeList, Optional: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, }, "tags": &schema.Schema{ Type: schema.TypeMap, Optional: true, }, }, } } func resourceAwsVpcDhcpOptionsCreate(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn setDHCPOption := func(key string) *ec2.NewDHCPConfiguration { log.Printf("[DEBUG] Setting DHCP option %s...", key) tfKey := strings.Replace(key, "-", "_", -1) value, ok := d.GetOk(tfKey) if !ok { return nil } if v, ok := value.(string); ok { return &ec2.NewDHCPConfiguration{ Key: aws.String(key), Values: []*string{ aws.String(v), }, } } if v, ok := value.([]interface{}); ok { var s []*string for _, attr := range v { s = append(s, aws.String(attr.(string))) } return &ec2.NewDHCPConfiguration{ Key: aws.String(key), Values: s, } } return nil } createOpts := &ec2.CreateDHCPOptionsInput{ DHCPConfigurations: []*ec2.NewDHCPConfiguration{ setDHCPOption("domain-name"), setDHCPOption("domain-name-servers"), setDHCPOption("ntp-servers"), setDHCPOption("netbios-node-type"), setDHCPOption("netbios-name-servers"), }, } resp, err := conn.CreateDHCPOptions(createOpts) if err != nil { return fmt.Errorf("Error creating DHCP Options Set: %s", err) } dos := resp.DHCPOptions d.SetId(*dos.DHCPOptionsID) log.Printf("[INFO] DHCP Options Set ID: %s", d.Id()) // Wait for the DHCP Options to become available log.Printf("[DEBUG] Waiting for DHCP Options (%s) to become available", d.Id()) stateConf := &resource.StateChangeConf{ Pending: []string{"pending"}, Target: "", Refresh: DHCPOptionsStateRefreshFunc(conn, d.Id()), Timeout: 1 * time.Minute, } if _, err := stateConf.WaitForState(); err != nil { return fmt.Errorf( "Error waiting for DHCP Options (%s) to become available: %s", d.Id(), err) } return resourceAwsVpcDhcpOptionsUpdate(d, meta) } func resourceAwsVpcDhcpOptionsRead(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn req := &ec2.DescribeDHCPOptionsInput{ DHCPOptionsIDs: []*string{ aws.String(d.Id()), }, } resp, err := conn.DescribeDHCPOptions(req) if err != nil { return fmt.Errorf("Error retrieving DHCP Options: %s", err) } if len(resp.DHCPOptions) == 0 { return nil } opts := resp.DHCPOptions[0] d.Set("tags", tagsToMap(opts.Tags)) for _, cfg := range opts.DHCPConfigurations { tfKey := strings.Replace(*cfg.Key, "-", "_", -1) if _, ok := d.Get(tfKey).(string); ok { d.Set(tfKey, cfg.Values[0].Value) } else { values := make([]string, 0, len(cfg.Values)) for _, v := range cfg.Values { values = append(values, *v.Value) } d.Set(tfKey, values) } } return nil } func resourceAwsVpcDhcpOptionsUpdate(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn return setTags(conn, d) } func resourceAwsVpcDhcpOptionsDelete(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn return resource.Retry(3*time.Minute, func() error { log.Printf("[INFO] Deleting DHCP Options ID %s...", d.Id()) _, err := conn.DeleteDHCPOptions(&ec2.DeleteDHCPOptionsInput{ DHCPOptionsID: aws.String(d.Id()), }) if err == nil { return nil } log.Printf("[WARN] %s", err) ec2err, ok := err.(awserr.Error) if !ok { return err } switch ec2err.Code() { case "InvalidDhcpOptionsID.NotFound": return nil case "DependencyViolation": // If it is a dependency violation, we want to disassociate // all VPCs using the given DHCP Options ID, and retry deleting. vpcs, err2 := findVPCsByDHCPOptionsID(conn, d.Id()) if err2 != nil { log.Printf("[ERROR] %s", err2) return err2 } for _, vpc := range vpcs { log.Printf("[INFO] Disassociating DHCP Options Set %s from VPC %s...", d.Id(), *vpc.VPCID) if _, err := conn.AssociateDHCPOptions(&ec2.AssociateDHCPOptionsInput{ DHCPOptionsID: aws.String("default"), VPCID: vpc.VPCID, }); err != nil { return err } } return err //retry default: // Any other error, we want to quit the retry loop immediately return resource.RetryError{Err: err} } return nil }) } func findVPCsByDHCPOptionsID(conn *ec2.EC2, id string) ([]*ec2.VPC, error) { req := &ec2.DescribeVPCsInput{ Filters: []*ec2.Filter{ &ec2.Filter{ Name: aws.String("dhcp-options-id"), Values: []*string{ aws.String(id), }, }, }, } resp, err := conn.DescribeVPCs(req) if err != nil { if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidVpcID.NotFound" { return nil, nil } return nil, err } return resp.VPCs, nil } func DHCPOptionsStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc { return func() (interface{}, string, error) { DescribeDhcpOpts := &ec2.DescribeDHCPOptionsInput{ DHCPOptionsIDs: []*string{ aws.String(id), }, } resp, err := conn.DescribeDHCPOptions(DescribeDhcpOpts) if err != nil { if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidDhcpOptionsID.NotFound" { resp = nil } else { log.Printf("Error on DHCPOptionsStateRefresh: %s", err) return nil, "", err } } if resp == nil { // Sometimes AWS just has consistency issues and doesn't see // our instance yet. Return an empty state. return nil, "", nil } dos := resp.DHCPOptions[0] return dos, "", nil } }