terraform/builtin/providers/aws/structure.go

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package aws
import (
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"strconv"
"strings"
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"github.com/mitchellh/goamz/autoscaling"
"github.com/mitchellh/goamz/ec2"
"github.com/mitchellh/goamz/elb"
)
// Takes the result of flatmap.Expand for an array of listeners and
// returns ELB API compatible objects
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func expandListeners(configured []interface{}) ([]elb.Listener, error) {
listeners := make([]elb.Listener, 0, len(configured))
// Loop over our configured listeners and create
// an array of goamz compatabile objects
for _, listener := range configured {
newL := listener.(map[string]interface{})
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instancePort, err := strconv.ParseInt(newL["instance_port"].(string), 0, 0)
lbPort, err := strconv.ParseInt(newL["lb_port"].(string), 0, 0)
if err != nil {
return nil, err
}
l := elb.Listener{
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InstancePort: instancePort,
InstanceProtocol: newL["instance_protocol"].(string),
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LoadBalancerPort: lbPort,
Protocol: newL["lb_protocol"].(string),
}
listeners = append(listeners, l)
}
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return listeners, nil
}
// Takes the result of flatmap.Expand for an array of ingress/egress
// security group rules and returns EC2 API compatible objects
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func expandIPPerms(configured []interface{}) ([]ec2.IPPerm, error) {
perms := make([]ec2.IPPerm, 0, len(configured))
// Loop over our configured permissions and create
// an array of goamz/ec2 compatabile objects
for _, perm := range configured {
// Our permission object
newP := perm.(map[string]interface{})
// Our new returned goamz compatible permission
p := ec2.IPPerm{}
// Ports
if attr, ok := newP["from_port"].(string); ok {
fromPort, err := strconv.Atoi(attr)
if err != nil {
return nil, err
}
p.FromPort = fromPort
}
if attr, ok := newP["to_port"].(string); ok {
toPort, err := strconv.Atoi(attr)
if err != nil {
return nil, err
}
p.ToPort = toPort
}
if attr, ok := newP["protocol"].(string); ok {
p.Protocol = attr
}
// Loop over the array of sg ids and built
// compatibile goamz objects
if secGroups, ok := newP["security_groups"].([]interface{}); ok {
expandedGroups := []ec2.UserSecurityGroup{}
gs := expandStringList(secGroups)
for _, g := range gs {
newG := ec2.UserSecurityGroup{
Id: g,
}
expandedGroups = append(expandedGroups, newG)
}
p.SourceGroups = expandedGroups
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}
// Expand CIDR blocks
if cidrBlocks, ok := newP["cidr_blocks"].([]interface{}); ok {
p.SourceIPs = expandStringList(cidrBlocks)
}
perms = append(perms, p)
}
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return perms, nil
}
// Flattens an array of ipPerms into a list of primitives that
// flatmap.Flatten() can handle
func flattenIPPerms(list []ec2.IPPerm) []map[string]interface{} {
result := make([]map[string]interface{}, 0, len(list))
for _, perm := range list {
n := make(map[string]interface{})
n["from_port"] = perm.FromPort
n["protocol"] = perm.Protocol
n["to_port"] = perm.ToPort
n["cidr_blocks"] = perm.SourceIPs
if v := flattenSecurityGroups(perm.SourceGroups); len(v) > 0 {
n["security_groups"] = v
}
result = append(result, n)
}
return result
}
// Flattens an array of UserSecurityGroups into a []string
func flattenSecurityGroups(list []ec2.UserSecurityGroup) []string {
result := make([]string, 0, len(list))
for _, g := range list {
result = append(result, g.Id)
}
return result
}
// Flattens an array of SecurityGroups into a []string
func flattenAutoscalingSecurityGroups(list []autoscaling.SecurityGroup) []string {
result := make([]string, 0, len(list))
for _, g := range list {
result = append(result, g.SecurityGroup)
}
return result
}
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// Flattens an array of AvailabilityZones into a []string
func flattenAvailabilityZones(list []autoscaling.AvailabilityZone) []string {
result := make([]string, 0, len(list))
for _, g := range list {
result = append(result, g.AvailabilityZone)
}
return result
}
// Flattens an array of LoadBalancerName into a []string
func flattenLoadBalancers(list []autoscaling.LoadBalancerName) []string {
result := make([]string, 0, len(list))
for _, g := range list {
if g.LoadBalancerName != "" {
result = append(result, g.LoadBalancerName)
}
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}
return result
}
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// Flattens an array of Instances into a []string
func flattenInstances(list []elb.Instance) []string {
result := make([]string, 0, len(list))
for _, i := range list {
result = append(result, i.InstanceId)
}
return result
}
// Takes the result of flatmap.Expand for an array of strings
// and returns a []string
func expandStringList(configured []interface{}) []string {
// here we special case the * expanded lists. For example:
//
// instances = ["${aws_instance.foo.*.id}"]
//
if len(configured) == 1 && strings.Contains(configured[0].(string), ",") {
return strings.Split(configured[0].(string), ",")
}
vs := make([]string, 0, len(configured))
for _, v := range configured {
vs = append(vs, v.(string))
}
return vs
}