Create provisioner for postgresql extensions

This change adds support for installing postgresql extensions on a
postgresql server.

builtin/providers/postgresql/resource_postgresql_extension.go

@@ -0,0 +1,67 @@
+package postgresql
+
+import (
+	"database/sql"
+	"fmt"
+
+	"github.com/hashicorp/errwrap"
+	"github.com/hashicorp/terraform/helper/schema"
+	"github.com/lib/pq"
+)
+
+func resourcePostgreSQLExtension() *schema.Resource {
+	return &schema.Resource{
+		Create: resourcePostgreSQLExtensionCreate,
+		Delete: resourcePostgreSQLExtensionDelete,
+
+		Schema: map[string]*schema.Schema{
+			"name": {
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+		},
+	}
+}
+
+func resourcePostgreSQLExtensionCreate(d *schema.ResourceData, meta interface{}) error {
+	client := meta.(*Client)
+	conn, err := client.Connect()
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	extensionName := d.Get("name").(string)
+
+	query := fmt.Sprintf("CREATE EXTENSION %s", pq.QuoteIdentifier(extensionName))
+	_, err = conn.Query(query)
+	if err != nil {
+		return errwrap.Wrapf("Error creating extension: {{err}}", err)
+	}
+
+	d.SetId(extensionName)
+
+	return resourcePostgreSQLRoleRead(d, meta)
+}
+
+func resourcePostgreSQLExtensionDelete(d *schema.ResourceData, meta interface{}) error {
+	client := meta.(*Client)
+	conn, err := client.Connect()
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	extensionName := d.Get("name").(string)
+
+	query := fmt.Sprintf("DROP EXTENSION %s", pq.QuoteIdentifier(extensionName))
+	_, err = conn.Query(query)
+	if err != nil {
+		return errwrap.Wrapf("Error deleting extension: {{err}}", err)
+	}
+
+	d.SetId("")
+
+	return nil
+}

builtin/providers/postgresql/resource_postgresql_extension_test.go

@@ -0,0 +1,102 @@
+package postgresql
+
+import (
+	"database/sql"
+	"fmt"
+	"testing"
+
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/terraform"
+)
+
+func TestAccPostgresqlExtension_Basic(t *testing.T) {
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckPostgresqlExtensionDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccPostgresqlExtensionConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckPostgresqlExtensionExists("postgresql_extension.myextension"),
+					resource.TestCheckResourceAttr(
+						"postgresql_role.myextension", "name", "pg_trgm"),
+				),
+			},
+		},
+	})
+}
+
+func testAccCheckPostgresqlExtensionDestroy(s *terraform.State) error {
+	client := testAccProvider.Meta().(*Client)
+
+	for _, rs := range s.RootModule().Resources {
+		if rs.Type != "postgresql_extension" {
+			continue
+		}
+
+		exists, err := checkExtensionExists(client, rs.Primary.ID)
+
+		if err != nil {
+			return fmt.Errorf("Error checking extension %s", err)
+		}
+
+		if exists {
+			return fmt.Errorf("Extension still exists after destroy")
+		}
+	}
+
+	return nil
+}
+
+func testAccCheckPostgresqlExtensionExists(n string) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		rs, ok := s.RootModule().Resources[n]
+		if !ok {
+			return fmt.Errorf("Resource not found: %s", n)
+		}
+
+		if rs.Primary.ID == "" {
+			return fmt.Errorf("No ID is set")
+		}
+
+		client := testAccProvider.Meta().(*Client)
+		exists, err := checkExtensionExists(client, rs.Primary.ID)
+
+		if err != nil {
+			return fmt.Errorf("Error checking extension %s", err)
+		}
+
+		if !exists {
+			return fmt.Errorf("Extension not found")
+		}
+
+		return nil
+	}
+}
+
+func checkExtensionExists(client *Client, extensionName string) (bool, error) {
+	conn, err := client.Connect()
+	if err != nil {
+		return false, err
+	}
+	defer conn.Close()
+
+	var _rez int
+	err = conn.QueryRow("SELECT 1 from pg_extension d WHERE extname=$1", extensionName).Scan(&_rez)
+	switch {
+	case err == sql.ErrNoRows:
+		return false, nil
+	case err != nil:
+		return false, fmt.Errorf("Error reading info about extension: %s", err)
+	default:
+		return true, nil
+	}
+}
+
+var testAccPostgresqlExtensionConfig = `
+resource "postgresql_extension" "myextension" {
+  name = "pg_trgm"
+}
+`

website/source/docs/providers/postgresql/r/postgresql_extension.html.markdown

@@ -0,0 +1,26 @@
+---
+layout: "postgresql"
+page_title: "PostgreSQL: postgresql_extension"
+sidebar_current: "docs-postgresql-resource-postgresql_extension"
+description: |-
+  Creates and manages an extension on a PostgreSQL server.
+---
+
+# postgresql\_role
+
+The ``[pstgresql_extension]`` resource creates and manages an extension on a PostgreSQL
+server.
+
+
+## Usage
+
+```
+resource "postgresql_role" "my_extension" {
+  name = "pg_trgm"
+}
+
+```
+
+## Argument Reference
+
+* `name` - (Required) The name of the extension.