terraform/builtin/providers/aws/resource_aws_route_table.go

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package aws
import (
"bytes"
"fmt"
"log"
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"time"
"github.com/hashicorp/terraform/helper/hashcode"
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"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
"github.com/mitchellh/goamz/ec2"
)
func resourceAwsRouteTable() *schema.Resource {
return &schema.Resource{
Create: resourceAwsRouteTableCreate,
Read: resourceAwsRouteTableRead,
Update: resourceAwsRouteTableUpdate,
Delete: resourceAwsRouteTableDelete,
Schema: map[string]*schema.Schema{
"vpc_id": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"route": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"cidr_block": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"gateway_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
},
"instance_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
},
},
},
Set: resourceAwsRouteTableHash,
},
},
}
}
func resourceAwsRouteTableCreate(d *schema.ResourceData, meta interface{}) error {
ec2conn := meta.(*AWSClient).ec2conn
// Create the routing table
createOpts := &ec2.CreateRouteTable{
VpcId: d.Get("vpc_id").(string),
}
log.Printf("[DEBUG] RouteTable create config: %#v", createOpts)
resp, err := ec2conn.CreateRouteTable(createOpts)
if err != nil {
return fmt.Errorf("Error creating route table: %s", err)
}
// Get the ID and store it
rt := &resp.RouteTable
d.SetId(rt.RouteTableId)
log.Printf("[INFO] Route Table ID: %s", d.Id())
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// Wait for the route table to become available
log.Printf(
"[DEBUG] Waiting for route table (%s) to become available",
d.Id())
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stateConf := &resource.StateChangeConf{
Pending: []string{"pending"},
Target: "ready",
Refresh: resourceAwsRouteTableStateRefreshFunc(ec2conn, d.Id()),
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Timeout: 1 * time.Minute,
}
if _, err := stateConf.WaitForState(); err != nil {
return fmt.Errorf(
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"Error waiting for route table (%s) to become available: %s",
d.Id(), err)
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}
return resourceAwsRouteTableUpdate(d, meta)
}
func resourceAwsRouteTableRead(d *schema.ResourceData, meta interface{}) error {
ec2conn := meta.(*AWSClient).ec2conn
rtRaw, _, err := resourceAwsRouteTableStateRefreshFunc(ec2conn, d.Id())()
if err != nil {
return err
}
if rtRaw == nil {
return nil
}
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rt := rtRaw.(*ec2.RouteTable)
d.Set("vpc_id", rt.VpcId)
// Create an empty schema.Set to hold all routes
route := &schema.Set{F: resourceAwsRouteTableHash}
// Loop through the routes and add them to the set
for _, r := range rt.Routes {
if r.GatewayId == "local" {
continue
}
m := make(map[string]interface{})
m["cidr_block"] = r.DestinationCidrBlock
if r.GatewayId != "" {
m["gateway_id"] = r.GatewayId
}
if r.InstanceId != "" {
m["instance_id"] = r.InstanceId
}
route.Add(m)
}
d.Set("route", route)
return nil
}
func resourceAwsRouteTableUpdate(d *schema.ResourceData, meta interface{}) error {
ec2conn := meta.(*AWSClient).ec2conn
// Check if the route set as a whole has changed
if d.HasChange("route") {
o, n := d.GetChange("route")
ors := o.(*schema.Set).Difference(n.(*schema.Set))
nrs := n.(*schema.Set).Difference(o.(*schema.Set))
// Now first loop through all the old routes and delete any obsolete ones
for _, route := range ors.List() {
m := route.(map[string]interface{})
// Delete the route as it no longer exists in the config
_, err := ec2conn.DeleteRoute(
d.Id(), m["cidr_block"].(string))
if err != nil {
return err
}
}
// Make sure we save the state of the currently configured rules
routes := o.(*schema.Set).Intersection(n.(*schema.Set))
d.Set("route", routes)
// Then loop through al the newly configured routes and create them
for _, route := range nrs.List() {
m := route.(map[string]interface{})
opts := ec2.CreateRoute{
RouteTableId: d.Id(),
DestinationCidrBlock: m["cidr_block"].(string),
GatewayId: m["gateway_id"].(string),
InstanceId: m["instance_id"].(string),
}
_, err := ec2conn.CreateRoute(&opts)
if err != nil {
return err
}
routes.Add(route)
d.Set("route", routes)
}
}
return resourceAwsRouteTableRead(d, meta)
}
func resourceAwsRouteTableDelete(d *schema.ResourceData, meta interface{}) error {
ec2conn := meta.(*AWSClient).ec2conn
// First request the routing table since we'll have to disassociate
// all the subnets first.
rtRaw, _, err := resourceAwsRouteTableStateRefreshFunc(ec2conn, d.Id())()
if err != nil {
return err
}
if rtRaw == nil {
return nil
}
rt := rtRaw.(*ec2.RouteTable)
// Do all the disassociations
for _, a := range rt.Associations {
log.Printf("[INFO] Disassociating association: %s", a.AssociationId)
if _, err := ec2conn.DisassociateRouteTable(a.AssociationId); err != nil {
return err
}
}
// Delete the route table
log.Printf("[INFO] Deleting Route Table: %s", d.Id())
if _, err := ec2conn.DeleteRouteTable(d.Id()); err != nil {
ec2err, ok := err.(*ec2.Error)
if ok && ec2err.Code == "InvalidRouteTableID.NotFound" {
return nil
}
return fmt.Errorf("Error deleting route table: %s", err)
}
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// Wait for the route table to really destroy
log.Printf(
"[DEBUG] Waiting for route table (%s) to become destroyed",
d.Id())
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stateConf := &resource.StateChangeConf{
Pending: []string{"ready"},
Target: "",
Refresh: resourceAwsRouteTableStateRefreshFunc(ec2conn, d.Id()),
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Timeout: 1 * time.Minute,
}
if _, err := stateConf.WaitForState(); err != nil {
return fmt.Errorf(
"Error waiting for route table (%s) to become destroyed: %s",
d.Id(), err)
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}
return nil
}
func resourceAwsRouteTableHash(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf("%s-", m["cidr_block"].(string)))
if v, ok := m["gateway_id"]; ok {
buf.WriteString(fmt.Sprintf("%s-", v.(string)))
}
if v, ok := m["instance_id"]; ok {
buf.WriteString(fmt.Sprintf("%s-", v.(string)))
}
return hashcode.String(buf.String())
}
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// resourceAwsRouteTableStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
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// a RouteTable.
func resourceAwsRouteTableStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc {
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return func() (interface{}, string, error) {
resp, err := conn.DescribeRouteTables([]string{id}, ec2.NewFilter())
if err != nil {
if ec2err, ok := err.(*ec2.Error); ok && ec2err.Code == "InvalidRouteTableID.NotFound" {
resp = nil
} else {
log.Printf("Error on RouteTableStateRefresh: %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
}
rt := &resp.RouteTables[0]
return rt, "ready", nil
}
}