fix(spanner): remove validation on version retention period on spanner database

.changelog/10184.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+spanner: removed validation function for the field `version_retention_period` in the resource `google_spanner_database` and directly returned error from backend 
+```

google/services/spanner/resource_spanner_database.go

@@ -22,8 +22,6 @@ import (
 	"fmt"
 	"log"
 	"reflect"
-	"regexp"
-	"strconv"
 	"strings"
 	"time"
 
@@ -67,44 +65,6 @@ func resourceSpannerDBDdlCustomDiff(_ context.Context, diff *schema.ResourceDiff
 	return resourceSpannerDBDdlCustomDiffFunc(diff)
 }
 
-func ValidateDatabaseRetentionPeriod(v interface{}, k string) (ws []string, errors []error) {
-	value := v.(string)
-	valueError := fmt.Errorf("version_retention_period should be in range [1h, 7d], in a format resembling 1d, 24h, 1440m, or 86400s")
-
-	r := regexp.MustCompile("^(\\d{1}d|\\d{1,3}h|\\d{2,5}m|\\d{4,6}s)$")
-	if !r.MatchString(value) {
-		errors = append(errors, valueError)
-		return
-	}
-
-	unit := value[len(value)-1:]
-	multiple := value[:len(value)-1]
-	num, err := strconv.Atoi(multiple)
-	if err != nil {
-		errors = append(errors, valueError)
-		return
-	}
-
-	if unit == "d" && (num < 1 || num > 7) {
-		errors = append(errors, valueError)
-		return
-	}
-	if unit == "h" && (num < 1 || num > 7*24) {
-		errors = append(errors, valueError)
-		return
-	}
-	if unit == "m" && (num < 1*60 || num > 7*24*60) {
-		errors = append(errors, valueError)
-		return
-	}
-	if unit == "s" && (num < 1*60*60 || num > 7*24*60*60) {
-		errors = append(errors, valueError)
-		return
-	}
-
-	return
-}
-
 func resourceSpannerDBVirtualUpdate(d *schema.ResourceData, resourceSchema map[string]*schema.Schema) bool {
 	// deletion_protection is the only virtual field
 	if d.HasChange("deletion_protection") {
@@ -210,10 +170,9 @@ in the same location as the Spanner Database.`,
 				},
 			},
 			"version_retention_period": {
-				Type:         schema.TypeString,
-				Computed:     true,
-				Optional:     true,
-				ValidateFunc: ValidateDatabaseRetentionPeriod,
+				Type:     schema.TypeString,
+				Computed: true,
+				Optional: true,
 				Description: `The retention period for the database. The retention period must be between 1 hour
 and 7 days, and can be specified in days, hours, minutes, or seconds. For example,
 the values 1d, 24h, 1440m, and 86400s are equivalent. Default value is 1h.

google/services/spanner/resource_spanner_database_test.go

@@ -10,7 +10,6 @@ import (
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 	"github.com/hashicorp/terraform-provider-google/google/acctest"
 	"github.com/hashicorp/terraform-provider-google/google/envvar"
-	"github.com/hashicorp/terraform-provider-google/google/services/spanner"
 )
 
 func TestAccSpannerDatabase_basic(t *testing.T) {
@@ -467,77 +466,6 @@ resource "google_spanner_database" "basic" {
 `, instanceName, instanceName, databaseName)
 }
 
-// Unit Tests for validation of retention period argument
-func TestValidateDatabaseRetentionPeriod(t *testing.T) {
-	t.Parallel()
-	testCases := map[string]struct {
-		input       string
-		expectError bool
-	}{
-		// Not valid input
-		"empty_string": {
-			input:       "",
-			expectError: true,
-		},
-		"number_with_no_unit": {
-			input:       "1",
-			expectError: true,
-		},
-		"less_than_1h": {
-			input:       "59m",
-			expectError: true,
-		},
-		"more_than_7days": {
-			input:       "8d",
-			expectError: true,
-		},
-		// Valid input
-		"1_hour_in_secs": {
-			input:       "3600s",
-			expectError: false,
-		},
-		"1_hour_in_mins": {
-			input:       "60m",
-			expectError: false,
-		},
-		"1_hour_in_hours": {
-			input:       "1h",
-			expectError: false,
-		},
-		"7_days_in_secs": {
-			input:       fmt.Sprintf("%ds", 7*24*60*60),
-			expectError: false,
-		},
-		"7_days_in_mins": {
-			input:       fmt.Sprintf("%dm", 7*24*60),
-			expectError: false,
-		},
-		"7_days_in_hours": {
-			input:       fmt.Sprintf("%dh", 7*24),
-			expectError: false,
-		},
-		"7_days_in_days": {
-			input:       "7d",
-			expectError: false,
-		},
-	}
-
-	for tn, tc := range testCases {
-		t.Run(tn, func(t *testing.T) {
-			_, errs := spanner.ValidateDatabaseRetentionPeriod(tc.input, "foobar")
-			var wantErrCount string
-			if tc.expectError {
-				wantErrCount = "1+"
-			} else {
-				wantErrCount = "0"
-			}
-			if (len(errs) > 0 && tc.expectError == false) || (len(errs) == 0 && tc.expectError == true) {
-				t.Errorf("failed, expected `%s` test case validation to have %s errors", tn, wantErrCount)
-			}
-		})
-	}
-}
-
 func TestAccSpannerDatabase_deletionProtection(t *testing.T) {
 	acctest.SkipIfVcr(t)
 	t.Parallel()