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resource_postgresql_extension.go
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resource_postgresql_extension.go
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package postgresql
import (
"bytes"
"database/sql"
"errors"
"fmt"
"log"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/terraform/helper/schema"
"github.com/lib/pq"
)
const (
extNameAttr = "name"
extSchemaAttr = "schema"
extVersionAttr = "version"
)
func resourcePostgreSQLExtension() *schema.Resource {
return &schema.Resource{
Create: resourcePostgreSQLExtensionCreate,
Read: resourcePostgreSQLExtensionRead,
Update: resourcePostgreSQLExtensionUpdate,
Delete: resourcePostgreSQLExtensionDelete,
Exists: resourcePostgreSQLExtensionExists,
Importer: &schema.ResourceImporter{
State: schema.ImportStatePassthrough,
},
Schema: map[string]*schema.Schema{
extNameAttr: {
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
extSchemaAttr: {
Type: schema.TypeString,
Optional: true,
Computed: true,
Description: "Sets the schema of an extension",
},
extVersionAttr: {
Type: schema.TypeString,
Optional: true,
Computed: true,
Description: "Sets the version number of the extension",
},
},
}
}
func resourcePostgreSQLExtensionCreate(d *schema.ResourceData, meta interface{}) error {
c := meta.(*Client)
c.catalogLock.Lock()
defer c.catalogLock.Unlock()
conn, err := c.Connect()
if err != nil {
return err
}
defer conn.Close()
extName := d.Get(extNameAttr).(string)
b := bytes.NewBufferString("CREATE EXTENSION ")
fmt.Fprint(b, pq.QuoteIdentifier(extName))
if v, ok := d.GetOk(extSchemaAttr); ok {
fmt.Fprint(b, " SCHEMA ", pq.QuoteIdentifier(v.(string)))
}
if v, ok := d.GetOk(extVersionAttr); ok {
fmt.Fprint(b, " VERSION ", pq.QuoteIdentifier(v.(string)))
}
query := b.String()
_, err = conn.Query(query)
if err != nil {
return errwrap.Wrapf("Error creating extension: {{err}}", err)
}
d.SetId(extName)
return resourcePostgreSQLExtensionReadImpl(d, meta)
}
func resourcePostgreSQLExtensionExists(d *schema.ResourceData, meta interface{}) (bool, error) {
c := meta.(*Client)
c.catalogLock.Lock()
defer c.catalogLock.Unlock()
conn, err := c.Connect()
if err != nil {
return false, err
}
defer conn.Close()
var extName string
err = conn.QueryRow("SELECT extname FROM pg_catalog.pg_extension WHERE extname = $1", d.Id()).Scan(&extName)
switch {
case err == sql.ErrNoRows:
return false, nil
case err != nil:
return false, err
}
return true, nil
}
func resourcePostgreSQLExtensionRead(d *schema.ResourceData, meta interface{}) error {
c := meta.(*Client)
c.catalogLock.RLock()
defer c.catalogLock.RUnlock()
return resourcePostgreSQLExtensionReadImpl(d, meta)
}
func resourcePostgreSQLExtensionReadImpl(d *schema.ResourceData, meta interface{}) error {
c := meta.(*Client)
conn, err := c.Connect()
if err != nil {
return err
}
defer conn.Close()
extID := d.Id()
var extName, extSchema, extVersion string
err = conn.QueryRow("SELECT e.extname, n.nspname, e.extversion FROM pg_catalog.pg_extension e, pg_catalog.pg_namespace n WHERE n.oid = e.extnamespace AND e.extname = $1", extID).Scan(&extName, &extSchema, &extVersion)
switch {
case err == sql.ErrNoRows:
log.Printf("[WARN] PostgreSQL extension (%s) not found", d.Id())
d.SetId("")
return nil
case err != nil:
return errwrap.Wrapf("Error reading extension: {{err}}", err)
default:
d.Set(extNameAttr, extName)
d.Set(extSchemaAttr, extSchema)
d.Set(extVersionAttr, extVersion)
d.SetId(extName)
return nil
}
}
func resourcePostgreSQLExtensionDelete(d *schema.ResourceData, meta interface{}) error {
c := meta.(*Client)
c.catalogLock.Lock()
defer c.catalogLock.Unlock()
conn, err := c.Connect()
if err != nil {
return err
}
defer conn.Close()
extID := d.Id()
query := fmt.Sprintf("DROP EXTENSION %s", pq.QuoteIdentifier(extID))
_, err = conn.Query(query)
if err != nil {
return errwrap.Wrapf("Error deleting extension: {{err}}", err)
}
d.SetId("")
return nil
}
func resourcePostgreSQLExtensionUpdate(d *schema.ResourceData, meta interface{}) error {
c := meta.(*Client)
c.catalogLock.Lock()
defer c.catalogLock.Unlock()
conn, err := c.Connect()
if err != nil {
return err
}
defer conn.Close()
// Can't rename a schema
if err := setExtSchema(conn, d); err != nil {
return err
}
if err := setExtVersion(conn, d); err != nil {
return err
}
return resourcePostgreSQLExtensionReadImpl(d, meta)
}
func setExtSchema(conn *sql.DB, d *schema.ResourceData) error {
if !d.HasChange(extSchemaAttr) {
return nil
}
extID := d.Id()
_, nraw := d.GetChange(extSchemaAttr)
n := nraw.(string)
if n == "" {
return errors.New("Error setting extension name to an empty string")
}
query := fmt.Sprintf("ALTER EXTENSION %s SET SCHEMA %s", pq.QuoteIdentifier(extID), pq.QuoteIdentifier(n))
if _, err := conn.Query(query); err != nil {
return errwrap.Wrapf("Error updating extension SCHEMA: {{err}}", err)
}
return nil
}
func setExtVersion(conn *sql.DB, d *schema.ResourceData) error {
if !d.HasChange(extVersionAttr) {
return nil
}
extID := d.Id()
b := bytes.NewBufferString("ALTER EXTENSION ")
fmt.Fprintf(b, "%s UPDATE", pq.QuoteIdentifier(extID))
_, nraw := d.GetChange(extVersionAttr)
n := nraw.(string)
if n != "" {
fmt.Fprintf(b, " TO %s", pq.QuoteIdentifier(n))
}
query := b.String()
if _, err := conn.Query(query); err != nil {
return errwrap.Wrapf("Error updating extension version: {{err}}", err)
}
return nil
}