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data_source_aws_subnet.go
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data_source_aws_subnet.go
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package aws
import (
"fmt"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/hashicorp/terraform/helper/schema"
)
func dataSourceAwsSubnet() *schema.Resource {
return &schema.Resource{
Read: dataSourceAwsSubnetRead,
Schema: map[string]*schema.Schema{
"availability_zone": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"cidr_block": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"ipv6_cidr_block": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"default_for_az": {
Type: schema.TypeBool,
Optional: true,
Computed: true,
},
"filter": ec2CustomFiltersSchema(),
"id": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"state": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"tags": tagsSchemaComputed(),
"vpc_id": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"assign_ipv6_address_on_creation": {
Type: schema.TypeBool,
Computed: true,
},
"map_public_ip_on_launch": {
Type: schema.TypeBool,
Computed: true,
},
"ipv6_cidr_block_association_id": {
Type: schema.TypeString,
Computed: true,
},
},
}
}
func dataSourceAwsSubnetRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
req := &ec2.DescribeSubnetsInput{}
if id, ok := d.GetOk("id"); ok {
req.SubnetIds = []*string{aws.String(id.(string))}
}
// We specify default_for_az as boolean, but EC2 filters want
// it to be serialized as a string. Note that setting it to
// "false" here does not actually filter by it *not* being
// the default, because Terraform can't distinguish between
// "false" and "not set".
defaultForAzStr := ""
if d.Get("default_for_az").(bool) {
defaultForAzStr = "true"
}
filters := map[string]string{
"availabilityZone": d.Get("availability_zone").(string),
"defaultForAz": defaultForAzStr,
"state": d.Get("state").(string),
"vpc-id": d.Get("vpc_id").(string),
}
if v, ok := d.GetOk("cidr_block"); ok {
filters["cidrBlock"] = v.(string)
}
if v, ok := d.GetOk("ipv6_cidr_block"); ok {
filters["ipv6-cidr-block-association.ipv6-cidr-block"] = v.(string)
}
req.Filters = buildEC2AttributeFilterList(filters)
req.Filters = append(req.Filters, buildEC2TagFilterList(
tagsFromMap(d.Get("tags").(map[string]interface{})),
)...)
req.Filters = append(req.Filters, buildEC2CustomFilterList(
d.Get("filter").(*schema.Set),
)...)
if len(req.Filters) == 0 {
// Don't send an empty filters list; the EC2 API won't accept it.
req.Filters = nil
}
log.Printf("[DEBUG] DescribeSubnets %s\n", req)
resp, err := conn.DescribeSubnets(req)
if err != nil {
return err
}
if resp == nil || len(resp.Subnets) == 0 {
return fmt.Errorf("no matching subnet found")
}
if len(resp.Subnets) > 1 {
return fmt.Errorf("multiple subnets matched; use additional constraints to reduce matches to a single subnet")
}
subnet := resp.Subnets[0]
d.SetId(*subnet.SubnetId)
d.Set("vpc_id", subnet.VpcId)
d.Set("availability_zone", subnet.AvailabilityZone)
d.Set("cidr_block", subnet.CidrBlock)
d.Set("default_for_az", subnet.DefaultForAz)
d.Set("state", subnet.State)
d.Set("tags", tagsToMap(subnet.Tags))
d.Set("assign_ipv6_address_on_creation", subnet.AssignIpv6AddressOnCreation)
d.Set("map_public_ip_on_launch", subnet.MapPublicIpOnLaunch)
for _, a := range subnet.Ipv6CidrBlockAssociationSet {
if *a.Ipv6CidrBlockState.State == "associated" { //we can only ever have 1 IPv6 block associated at once
d.Set("ipv6_cidr_block_association_id", a.AssociationId)
d.Set("ipv6_cidr_block", a.Ipv6CidrBlock)
}
}
return nil
}