add send_secondary_ip_range_if_empty

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/hashicorp/hcl/v2 v2.20.1
 	github.com/hashicorp/terraform-json v0.22.1
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.33.0
-	github.com/hashicorp/terraform-provider-google-beta v1.20.1-0.20240813201407-f2425b4433f6
+	github.com/hashicorp/terraform-provider-google-beta v1.20.1-0.20240813211423-bff22d1f68ad
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.9.0

go.sum

@@ -190,8 +190,8 @@ github.com/hashicorp/terraform-plugin-sdk/v2 v2.33.0 h1:qHprzXy/As0rxedphECBEQAh
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.33.0/go.mod h1:H+8tjs9TjV2w57QFVSMBQacf8k/E1XwLXGCARgViC6A=
 github.com/hashicorp/terraform-plugin-testing v1.5.1 h1:T4aQh9JAhmWo4+t1A7x+rnxAJHCDIYW9kXyo4sVO92c=
 github.com/hashicorp/terraform-plugin-testing v1.5.1/go.mod h1:dg8clO6K59rZ8w9EshBmDp1CxTIPu3yA4iaDpX1h5u0=
-github.com/hashicorp/terraform-provider-google-beta v1.20.1-0.20240813201407-f2425b4433f6 h1:SLS0h0Io1bzZmjS0JGG6GRe+7Szi1t8ydbBUZXnG9EE=
-github.com/hashicorp/terraform-provider-google-beta v1.20.1-0.20240813201407-f2425b4433f6/go.mod h1:IkI2dOHongwQ2RIUyitBH4rDJvYBuClAoFCheApCTpY=
+github.com/hashicorp/terraform-provider-google-beta v1.20.1-0.20240813211423-bff22d1f68ad h1:4v6d8n+4QoS5BoK40yQjbTtL8M9FIaaN1O8Hvpo/Ucw=
+github.com/hashicorp/terraform-provider-google-beta v1.20.1-0.20240813211423-bff22d1f68ad/go.mod h1:IkI2dOHongwQ2RIUyitBH4rDJvYBuClAoFCheApCTpY=
 github.com/hashicorp/terraform-registry-address v0.2.3 h1:2TAiKJ1A3MAkZlH1YI/aTVcLZRu7JseiXNRHbOAyoTI=
 github.com/hashicorp/terraform-registry-address v0.2.3/go.mod h1:lFHA76T8jfQteVfT7caREqguFrW3c4MFSPhZB7HHgUM=
 github.com/hashicorp/terraform-svchost v0.1.1 h1:EZZimZ1GxdqFRinZ1tpJwVxxt49xc/S52uzrw4x0jKQ=

tfplan2cai/converters/google/resources/services/compute/compute_subnetwork.go

@@ -17,6 +17,7 @@ package compute
 import (
 	"context"
 	"fmt"
+	"log"
 	"net"
 	"reflect"
 
@@ -48,6 +49,37 @@ func IsShrinkageIpCidr(_ context.Context, old, new, _ interface{}) bool {
 	return true
 }
 
+func sendSecondaryIpRangeIfEmptyDiff(_ context.Context, diff *schema.ResourceDiff, meta interface{}) error {
+	// on create, return immediately as we don't need to determine if the value is empty or not
+	if diff.Id() == "" {
+		return nil
+	}
+
+	sendZero := diff.Get("send_secondary_ip_range_if_empty").(bool)
+	if !sendZero {
+		return nil
+	}
+
+	configSecondaryIpRange := diff.GetRawConfig().GetAttr("secondary_ip_range")
+	if !configSecondaryIpRange.IsKnown() {
+		return nil
+	}
+	configValueIsEmpty := configSecondaryIpRange.IsNull() || configSecondaryIpRange.LengthInt() == 0
+
+	stateSecondaryIpRange := diff.GetRawState().GetAttr("secondary_ip_range")
+	if !stateSecondaryIpRange.IsKnown() {
+		return nil
+	}
+	stateValueIsEmpty := stateSecondaryIpRange.IsNull() || stateSecondaryIpRange.LengthInt() == 0
+
+	if configValueIsEmpty && !stateValueIsEmpty {
+		log.Printf("[DEBUG] setting secondary_ip_range to newly empty")
+		diff.SetNew("secondary_ip_range", make([]interface{}, 0))
+	}
+
+	return nil
+}
+
 const ComputeSubnetworkAssetType string = "compute.googleapis.com/Subnetwork"
 
 func ResourceConverterComputeSubnetwork() cai.ResourceConverter {