provider/random: Separate read from create

We now generate the read operation which sets the various encodings of
the random value such that adding new ones does not require generating a
new random value.

We also verify that these are set correctly via the acceptance tests.

builtin/providers/random/resource_id.go

@@ -14,7 +14,7 @@ import (
 func resourceId() *schema.Resource {
 	return &schema.Resource{
 		Create: CreateID,
-		Read:   schema.Noop,
+		Read:   RepopulateEncodings,
 		Delete: schema.RemoveFromState,
 
 		Schema: map[string]*schema.Schema{
@@ -59,8 +59,7 @@ func resourceId() *schema.Resource {
 	}
 }
 
-func CreateID(d *schema.ResourceData, _ interface{}) error {
-
+func CreateID(d *schema.ResourceData, meta interface{}) error {
 	byteLength := d.Get("byte_length").(int)
 	bytes := make([]byte, byteLength)
 
@@ -73,17 +72,28 @@ func CreateID(d *schema.ResourceData, _ interface{}) error {
 	}
 
 	b64Str := base64.RawURLEncoding.EncodeToString(bytes)
+	d.SetId(b64Str)
+
+	return RepopulateEncodings(d, meta)
+}
+
+func RepopulateEncodings(d *schema.ResourceData, _ interface{}) error {
+	base64Str := d.Id()
+
+	bytes, err := base64.RawURLEncoding.DecodeString(base64Str)
+	if err != nil {
+		return errwrap.Wrapf("Error decoding ID: {{err}}", err)
+	}
+
 	b64StdStr := base64.StdEncoding.EncodeToString(bytes)
 	hexStr := hex.EncodeToString(bytes)
 
 	bigInt := big.Int{}
 	bigInt.SetBytes(bytes)
 	decStr := bigInt.String()
 
-	d.SetId(b64Str)
-
-	d.Set("b64", b64Str)
-	d.Set("b64_url", b64Str)
+	d.Set("b64", base64Str)
+	d.Set("b64_url", base64Str)
 	d.Set("b64_std", b64StdStr)
 
 	d.Set("hex", hexStr)

builtin/providers/random/resource_id_test.go

@@ -13,7 +13,7 @@ func TestAccResourceID(t *testing.T) {
 		PreCheck:  func() { testAccPreCheck(t) },
 		Providers: testAccProviders,
 		Steps: []resource.TestStep{
-			resource.TestStep{
+			{
 				Config: testAccResourceIDConfig,
 				Check: resource.ComposeTestCheckFunc(
 					testAccResourceIDCheck("random_id.foo"),
@@ -34,12 +34,20 @@ func testAccResourceIDCheck(id string) resource.TestCheckFunc {
 		}
 
 		b64Str := rs.Primary.Attributes["b64"]
+		b64UrlStr := rs.Primary.Attributes["b64_url"]
+		b64StdStr := rs.Primary.Attributes["b64_std"]
 		hexStr := rs.Primary.Attributes["hex"]
 		decStr := rs.Primary.Attributes["dec"]
 
 		if got, want := len(b64Str), 6; got != want {
 			return fmt.Errorf("base64 string length is %d; want %d", got, want)
 		}
+		if got, want := len(b64UrlStr), 6; got != want {
+			return fmt.Errorf("base64 URL string length is %d; want %d", got, want)
+		}
+		if got, want := len(b64StdStr), 8; got != want {
+			return fmt.Errorf("base64 STD string length is %d; want %d", got, want)
+		}
 		if got, want := len(hexStr), 8; got != want {
 			return fmt.Errorf("hex string length is %d; want %d", got, want)
 		}