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resource_aws_route_table.go
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resource_aws_route_table.go
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package aws
import (
"fmt"
"log"
"reflect"
"time"
"github.com/hashicorp/terraform/flatmap"
"github.com/hashicorp/terraform/helper/diff"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/goamz/ec2"
)
func resource_aws_route_table_create(
s *terraform.InstanceState,
d *terraform.InstanceDiff,
meta interface{}) (*terraform.InstanceState, error) {
p := meta.(*ResourceProvider)
ec2conn := p.ec2conn
// Create the routing table
createOpts := &ec2.CreateRouteTable{
VpcId: d.Attributes["vpc_id"].New,
}
log.Printf("[DEBUG] RouteTable create config: %#v", createOpts)
resp, err := ec2conn.CreateRouteTable(createOpts)
if err != nil {
return nil, fmt.Errorf("Error creating route table: %s", err)
}
// Get the ID and store it
rt := &resp.RouteTable
s.ID = rt.RouteTableId
log.Printf("[INFO] Route Table ID: %s", s.ID)
// Wait for the route table to become available
log.Printf(
"[DEBUG] Waiting for route table (%s) to become available",
s.ID)
stateConf := &resource.StateChangeConf{
Pending: []string{"pending"},
Target: "ready",
Refresh: RouteTableStateRefreshFunc(ec2conn, s.ID),
Timeout: 1 * time.Minute,
}
if _, err := stateConf.WaitForState(); err != nil {
return s, fmt.Errorf(
"Error waiting for route table (%s) to become available: %s",
s.ID, err)
}
// Update our routes
return resource_aws_route_table_update(s, d, meta)
}
func resource_aws_route_table_update(
s *terraform.InstanceState,
d *terraform.InstanceDiff,
meta interface{}) (*terraform.InstanceState, error) {
p := meta.(*ResourceProvider)
ec2conn := p.ec2conn
// Our resulting state
rs := s.MergeDiff(d)
// Get our routes out of the merge
oldroutes := flatmap.Expand(s.Attributes, "route")
routes := flatmap.Expand(s.MergeDiff(d).Attributes, "route")
// Determine the route operations we need to perform
ops := routeTableOps(oldroutes, routes)
if len(ops) == 0 {
return s, nil
}
// Go through each operation, performing each one at a time.
// We store the updated state on each operation so that if any
// individual operation fails, we can return a valid partial state.
var err error
resultRoutes := make([]map[string]string, 0, len(ops))
for _, op := range ops {
switch op.Op {
case routeTableOpCreate:
opts := ec2.CreateRoute{
RouteTableId: s.ID,
DestinationCidrBlock: op.Route.DestinationCidrBlock,
GatewayId: op.Route.GatewayId,
InstanceId: op.Route.InstanceId,
}
_, err = ec2conn.CreateRoute(&opts)
case routeTableOpReplace:
opts := ec2.ReplaceRoute{
RouteTableId: s.ID,
DestinationCidrBlock: op.Route.DestinationCidrBlock,
GatewayId: op.Route.GatewayId,
InstanceId: op.Route.InstanceId,
}
_, err = ec2conn.ReplaceRoute(&opts)
case routeTableOpDelete:
_, err = ec2conn.DeleteRoute(
s.ID, op.Route.DestinationCidrBlock)
}
if err != nil {
// Exit early so we can return what we've done so far
break
}
// If we didn't delete the route, append it to the list of routes
// we have.
if op.Op != routeTableOpDelete {
resultMap := map[string]string{"cidr_block": op.Route.DestinationCidrBlock}
if op.Route.GatewayId != "" {
resultMap["gateway_id"] = op.Route.GatewayId
} else if op.Route.InstanceId != "" {
resultMap["instance_id"] = op.Route.InstanceId
}
resultRoutes = append(resultRoutes, resultMap)
}
}
// Update our state with the settings
flatmap.Map(rs.Attributes).Merge(flatmap.Flatten(map[string]interface{}{
"route": resultRoutes,
}))
return rs, err
}
func resource_aws_route_table_destroy(
s *terraform.InstanceState,
meta interface{}) error {
p := meta.(*ResourceProvider)
ec2conn := p.ec2conn
// First request the routing table since we'll have to disassociate
// all the subnets first.
rtRaw, _, err := RouteTableStateRefreshFunc(ec2conn, s.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", s.ID)
if _, err := ec2conn.DeleteRouteTable(s.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)
}
// Wait for the route table to really destroy
log.Printf(
"[DEBUG] Waiting for route table (%s) to become destroyed",
s.ID)
stateConf := &resource.StateChangeConf{
Pending: []string{"ready"},
Target: "",
Refresh: RouteTableStateRefreshFunc(ec2conn, s.ID),
Timeout: 1 * time.Minute,
}
if _, err := stateConf.WaitForState(); err != nil {
return fmt.Errorf(
"Error waiting for route table (%s) to become destroyed: %s",
s.ID, err)
}
return nil
}
func resource_aws_route_table_refresh(
s *terraform.InstanceState,
meta interface{}) (*terraform.InstanceState, error) {
p := meta.(*ResourceProvider)
ec2conn := p.ec2conn
rtRaw, _, err := RouteTableStateRefreshFunc(ec2conn, s.ID)()
if err != nil {
return s, err
}
if rtRaw == nil {
return nil, nil
}
rt := rtRaw.(*ec2.RouteTable)
return resource_aws_route_table_update_state(s, rt)
}
func resource_aws_route_table_diff(
s *terraform.InstanceState,
c *terraform.ResourceConfig,
meta interface{}) (*terraform.InstanceDiff, error) {
b := &diff.ResourceBuilder{
Attrs: map[string]diff.AttrType{
"vpc_id": diff.AttrTypeCreate,
"route": diff.AttrTypeUpdate,
},
}
return b.Diff(s, c)
}
func resource_aws_route_table_update_state(
s *terraform.InstanceState,
rt *ec2.RouteTable) (*terraform.InstanceState, error) {
s.Attributes["vpc_id"] = rt.VpcId
return s, nil
}
// routeTableOp represents a minor operation on the routing table.
// This tells us what we should do to the routing table.
type routeTableOp struct {
Op routeTableOpType
Route ec2.Route
}
// routeTableOpType is the type of operation related to a route that
// can be operated on a routing table.
type routeTableOpType byte
const (
routeTableOpCreate routeTableOpType = iota
routeTableOpReplace
routeTableOpDelete
)
// routeTableOps takes the old and new routes from flatmap.Expand
// and returns a set of operations that must be performed in order
// to get to the desired state.
func routeTableOps(a interface{}, b interface{}) []routeTableOp {
// Build up the actual ec2.Route objects
oldRoutes := make(map[string]ec2.Route)
newRoutes := make(map[string]ec2.Route)
for i, raws := range []interface{}{a, b} {
result := oldRoutes
if i == 1 {
result = newRoutes
}
if raws == nil {
continue
}
for _, raw := range raws.([]interface{}) {
m := raw.(map[string]interface{})
r := ec2.Route{
DestinationCidrBlock: m["cidr_block"].(string),
}
if v, ok := m["gateway_id"]; ok {
r.GatewayId = v.(string)
}
if v, ok := m["instance_id"]; ok {
r.InstanceId = v.(string)
}
result[r.DestinationCidrBlock] = r
}
}
// Now, start building up the ops
ops := make([]routeTableOp, 0, len(newRoutes))
for n, r := range newRoutes {
op := routeTableOpCreate
if oldR, ok := oldRoutes[n]; ok {
if reflect.DeepEqual(r, oldR) {
// No changes!
continue
}
op = routeTableOpReplace
}
ops = append(ops, routeTableOp{
Op: op,
Route: r,
})
}
// Determine what routes we need to delete
for _, op := range ops {
delete(oldRoutes, op.Route.DestinationCidrBlock)
}
for _, r := range oldRoutes {
ops = append(ops, routeTableOp{
Op: routeTableOpDelete,
Route: r,
})
}
return ops
}
// RouteTableStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
// a RouteTable.
func RouteTableStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc {
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
}
}