Support StorageType parameter in RDS requests

This allows DB instances to be created with the "gp2" (general purpose
SSD) storage type.

rds/rds.go

@@ -93,6 +93,7 @@ func makeParams(action string) map[string]string {
 type DBInstance struct {
 	Address                    string        `xml:"Endpoint>Address"`
 	AllocatedStorage           int           `xml:"AllocatedStorage"`
+	StorageType                string        `xml:"StorageType"`
 	AvailabilityZone           string        `xml:"AvailabilityZone"`
 	BackupRetentionPeriod      int           `xml:"BackupRetentionPeriod"`
 	DBInstanceClass            string        `xml:"DBInstanceClass"`
@@ -170,6 +171,7 @@ type Parameter struct {
 // The CreateDBInstance request parameters
 type CreateDBInstance struct {
 	AllocatedStorage           int
+	StorageType                string
 	AvailabilityZone           string
 	BackupRetentionPeriod      int
 	DBInstanceClass            string
@@ -203,6 +205,10 @@ func (rds *Rds) CreateDBInstance(options *CreateDBInstance) (resp *SimpleResp, e
 		params["AllocatedStorage"] = strconv.Itoa(options.AllocatedStorage)
 	}
 
+	if options.StorageType != "" {
+		params["StorageType"] = options.StorageType
+	}
+
 	if options.SetBackupRetentionPeriod {
 		params["BackupRetentionPeriod"] = strconv.Itoa(options.BackupRetentionPeriod)
 	}

rds/rds_test.go

@@ -44,6 +44,7 @@ func (s *S) Test_CreateDBInstance(c *C) {
 		EngineVersion:              "",
 		DBName:                     "5.6.13",
 		AllocatedStorage:           10,
+		StorageType:                "gp2",
 		MasterUsername:             "foobar",
 		MasterUserPassword:         "bazbarbaz",
 		DBInstanceClass:            "db.m1.small",
@@ -58,6 +59,7 @@ func (s *S) Test_CreateDBInstance(c *C) {
 
 	c.Assert(req.Form["Action"], DeepEquals, []string{"CreateDBInstance"})
 	c.Assert(req.Form["Engine"], DeepEquals, []string{"mysql"})
+	c.Assert(req.Form["StorageType"], DeepEquals, []string{"gp2"})
 	c.Assert(req.Form["DBSecurityGroups.member.1"], DeepEquals, []string{"foo"})
 	c.Assert(err, IsNil)
 	c.Assert(resp.RequestId, Equals, "523e3218-afc7-11c3-90f5-f90431260ab4")
@@ -139,6 +141,7 @@ func (s *S) Test_DescribeDBInstances(c *C) {
 	c.Assert(resp.DBInstances[0].DBName, Equals, "mysampledb")
 	c.Assert(resp.DBInstances[0].DBSecurityGroupNames, DeepEquals, []string{"my-db-secgroup"})
 	c.Assert(resp.DBInstances[0].DBParameterGroupName, Equals, "default.mysql5.6")
+	c.Assert(resp.DBInstances[0].StorageType, Equals, "gp2")
 	c.Assert(resp.DBInstances[1].VpcSecurityGroupIds, DeepEquals, []string{"my-vpc-secgroup"})
 }
 

rds/responses_test.go

@@ -54,6 +54,7 @@ var DescribeDBInstancesExample = `
         <AutoMinorVersionUpgrade>true</AutoMinorVersionUpgrade>
         <InstanceCreateTime>2014-01-29T22:58:24.231Z</InstanceCreateTime>
         <AllocatedStorage>5</AllocatedStorage>
+        <StorageType>gp2</StorageType>
         <MasterUsername>myawsuser</MasterUsername>
         <DBInstanceClass>db.t1.micro</DBInstanceClass>
       </DBInstance>