feat: Convert from blocks to nested attributes in advancedClusterToV2 command

internal/cli/clu2adv/clu2adv.go

@@ -10,10 +10,10 @@ import (
 
 func Builder() *cobra.Command {
 	o := &struct {
-		*cli.BaseOpts
+		cli.BaseOpts
 		includeMoved bool
 	}{
-		BaseOpts: &cli.BaseOpts{
+		BaseOpts: cli.BaseOpts{
 			Fs: afero.NewOsFs(),
 		},
 	}
@@ -28,7 +28,7 @@ func Builder() *cobra.Command {
 		Aliases: []string{"clu2adv"},
 		RunE:    o.RunE,
 	}
-	cli.SetupCommonFlags(cmd, o.BaseOpts)
+	cli.SetupCommonFlags(cmd, &o.BaseOpts)
 	cmd.Flags().BoolVarP(&o.includeMoved, flag.IncludeMoved, flag.IncludeMovedShort, false,
 		"include moved blocks in the output file")
 	return cmd

internal/convert/adv2v2.go

@@ -1,6 +1,11 @@
 package convert
 
-import "github.com/mongodb-labs/atlas-cli-plugin-terraform/internal/hcl"
+import (
+	"slices"
+
+	"github.com/hashicorp/hcl/v2/hclwrite"
+	"github.com/mongodb-labs/atlas-cli-plugin-terraform/internal/hcl"
+)
 
 // AdvancedClusterToV2 transforms all mongodbatlas_advanced_cluster resource definitions in a
 // Terraform configuration file from SDKv2 schema to TPF (Terraform Plugin Framework) schema.
@@ -11,5 +16,91 @@ func AdvancedClusterToV2(config []byte) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+	parserb := parser.Body()
+	for _, block := range parserb.Blocks() {
+		updated, err := updateResource(block)
+		if err != nil {
+			return nil, err
+		}
+		if updated { // If the resource was converted, add a comment at the end so user knows the resource was updated
+			blockb := block.Body()
+			blockb.AppendNewline()
+			hcl.AppendComment(blockb, commentUpdatedBy)
+		}
+	}
 	return parser.Bytes(), nil
 }
+
+func updateResource(resource *hclwrite.Block) (bool, error) {
+	if resource.Type() != resourceType || getResourceName(resource) != advCluster {
+		return false, nil
+	}
+	resourceb := resource.Body()
+	if hasExpectedBlocksAsAttributes(resourceb) {
+		return false, nil
+	}
+	if err := convertRepSpecs(resourceb); err != nil {
+		return false, err
+	}
+	if err := fillTagsLabelsOpt(resourceb, nTags); err != nil {
+		return false, err
+	}
+	if err := fillTagsLabelsOpt(resourceb, nLabels); err != nil {
+		return false, err
+	}
+	fillBlockOpt(resourceb, nAdvConf)
+	fillBlockOpt(resourceb, nBiConnector)
+	fillBlockOpt(resourceb, nPinnedFCV)
+	fillBlockOpt(resourceb, nTimeouts)
+	return true, nil
+}
+
+func convertRepSpecs(resourceb *hclwrite.Body) error {
+	block := resourceb.FirstMatchingBlock(nRepSpecs, nil)
+	if block == nil {
+		return nil
+	}
+	resourceb.RemoveBlock(block)
+	if err := convertConfig(block.Body()); err != nil {
+		return err
+	}
+	resourceb.SetAttributeRaw(nRepSpecs, hcl.TokensArraySingle(block.Body()))
+	return nil
+}
+
+func convertConfig(repSpecs *hclwrite.Body) error {
+	block := repSpecs.FirstMatchingBlock(nConfig, nil)
+	if block == nil {
+		return nil
+	}
+	repSpecs.RemoveBlock(block)
+	blockb := block.Body()
+	fillBlockOpt(blockb, nElectableSpecs)
+	fillBlockOpt(blockb, nReadOnlySpecs)
+	fillBlockOpt(blockb, nAnalyticsSpecs)
+	fillBlockOpt(blockb, nAutoScaling)
+	fillBlockOpt(blockb, nAnalyticsAutoScaling)
+	repSpecs.SetAttributeRaw(nConfig, hcl.TokensArraySingle(blockb))
+	return nil
+}
+
+// hasExpectedBlocksAsAttributes checks if any of the expected block names
+// exist as attributes in the resource body. In that case conversion is not done
+// as advanced cluster is not in a valid SDKv2 configuration.
+func hasExpectedBlocksAsAttributes(resourceb *hclwrite.Body) bool {
+	expectedBlocks := []string{
+		nRepSpecs,
+		nTags,
+		nLabels,
+		nAdvConf,
+		nBiConnector,
+		nPinnedFCV,
+		nTimeouts,
+	}
+	for name := range resourceb.Attributes() {
+		if slices.Contains(expectedBlocks, name) {
+			return true
+		}
+	}
+	return false
+}

internal/convert/clu2adv.go

@@ -13,29 +13,6 @@ import (
 	"github.com/zclconf/go-cty/cty"
 )
 
-const (
-	resourceType     = "resource"
-	dataSourceType   = "data"
-	cluster          = "mongodbatlas_cluster"
-	advCluster       = "mongodbatlas_advanced_cluster"
-	clusterPlural    = "mongodbatlas_clusters"
-	advClusterPlural = "mongodbatlas_advanced_clusters"
-	valClusterType   = "REPLICASET"
-	valMaxPriority   = 7
-	valMinPriority   = 0
-	errFreeCluster   = "free cluster (because no " + nRepSpecs + ")"
-	errRepSpecs      = "setting " + nRepSpecs
-	errConfigs       = "setting " + nConfig
-	errPriority      = "setting " + nPriority
-	errNumShards     = "setting " + nNumShards
-
-	commentGeneratedBy       = "Generated by atlas-cli-plugin-terraform."
-	commentConfirmReferences = "Please review the changes and confirm that references to this resource are updated."
-	commentMovedBlock        = "Moved blocks"
-	commentRemovedOld        = "Note: Remember to remove or comment out the old cluster definitions."
-	commentPriorityFor       = "Regions must be sorted by priority in descending order."
-)
-
 var (
 	dynamicBlockAllowList = []string{nTags, nLabels, nConfigSrc, nRepSpecs}
 )
@@ -188,10 +165,10 @@ func fillCluster(resourceb *hclwrite.Body) error {
 	if err := fillTagsLabelsOpt(resourceb, nLabels); err != nil {
 		return err
 	}
-	fillBlockOpt(resourceb, nTimeouts)
 	fillBlockOpt(resourceb, nAdvConf)
 	fillBlockOpt(resourceb, nBiConnector)
 	fillBlockOpt(resourceb, nPinnedFCV)
+	fillBlockOpt(resourceb, nTimeouts)
 	return nil
 }
 

internal/convert/const_names.go → internal/convert/const.go

@@ -1,6 +1,27 @@
 package convert
 
 const (
+	resourceType     = "resource"
+	dataSourceType   = "data"
+	cluster          = "mongodbatlas_cluster"
+	advCluster       = "mongodbatlas_advanced_cluster"
+	clusterPlural    = "mongodbatlas_clusters"
+	advClusterPlural = "mongodbatlas_advanced_clusters"
+	valClusterType   = "REPLICASET"
+	valMaxPriority   = 7
+	valMinPriority   = 0
+	errFreeCluster   = "free cluster (because no " + nRepSpecs + ")"
+	errRepSpecs      = "setting " + nRepSpecs
+	errPriority      = "setting " + nPriority
+	errNumShards     = "setting " + nNumShards
+
+	commentGeneratedBy       = "Generated by atlas-cli-plugin-terraform."
+	commentConfirmReferences = "Please review the changes and confirm that references to this resource are updated."
+	commentUpdatedBy         = "Updated by atlas-cli-plugin-terraform, please review the changes."
+	commentMovedBlock        = "Moved blocks"
+	commentRemovedOld        = "Note: Remember to remove or comment out the old cluster definitions."
+	commentPriorityFor       = "Regions must be sorted by priority in descending order."
+
 	nRepSpecs                   = "replication_specs"
 	nConfig                     = "region_configs"
 	nConfigSrc                  = "regions_config"
@@ -12,6 +33,7 @@ const (
 	nBiConnector                = "bi_connector_config"
 	nElectableSpecs             = "electable_specs"
 	nAutoScaling                = "auto_scaling"
+	nAnalyticsAutoScaling       = "analytics_auto_scaling"
 	nReadOnlySpecs              = "read_only_specs"
 	nAnalyticsSpecs             = "analytics_specs"
 	nRegionNameSrc              = "provider_region_name"

internal/convert/testdata/adv2v2/adv_config_bi_connector_pinned_fcv.in.tf

@@ -0,0 +1,32 @@
+resource "mongodbatlas_advanced_cluster" "this" {
+  project_id   = var.project_id
+  name         = var.cluster_name
+  cluster_type = "REPLICASET"
+  replication_specs {
+    region_configs {
+      priority      = 7
+      provider_name = "AWS"
+      region_name   = "EU_WEST_1"
+      electable_specs {
+        instance_size = "M10"
+        node_count    = 3
+      }
+    }
+  }
+
+  advanced_configuration {
+    # comments in advanced_configuration are kept
+    javascript_enabled = true
+  }
+
+  bi_connector_config {
+    # comments in bi_connector_config are kept
+    enabled         = true
+    read_preference = "secondary"
+  }
+
+  pinned_fcv {
+    # comments in pinned_fcv are kept
+    expiration_date = var.fcv_date
+  }
+}

internal/convert/testdata/adv2v2/adv_config_bi_connector_pinned_fcv.out.tf

@@ -0,0 +1,38 @@
+resource "mongodbatlas_advanced_cluster" "this" {
+  project_id   = var.project_id
+  name         = var.cluster_name
+  cluster_type = "REPLICASET"
+
+
+
+  replication_specs = [
+    {
+      region_configs = [
+        {
+          priority      = 7
+          provider_name = "AWS"
+          region_name   = "EU_WEST_1"
+          electable_specs = {
+            instance_size = "M10"
+            node_count    = 3
+          }
+        }
+      ]
+    }
+  ]
+  advanced_configuration = {
+    # comments in advanced_configuration are kept
+    javascript_enabled = true
+  }
+  bi_connector_config = {
+    # comments in bi_connector_config are kept
+    enabled         = true
+    read_preference = "secondary"
+  }
+  pinned_fcv = {
+    # comments in pinned_fcv are kept
+    expiration_date = var.fcv_date
+  }
+
+  # Updated by atlas-cli-plugin-terraform, please review the changes.
+}

internal/convert/testdata/adv2v2/basic.in.tf

@@ -1,4 +1,16 @@
-resource "mongodbatlas_advanced_cluster" "basic" {
-  name = "basic"
-  // TODO: missing fields as transformation is not implemented yet
+resource "mongodbatlas_advanced_cluster" "clu" {
+  project_id   = var.project_id
+  name         = "clu"
+  cluster_type = "REPLICASET"
+  replication_specs {
+    region_configs {
+      priority      = 7
+      provider_name = "AWS"
+      region_name   = "EU_WEST_1"
+      electable_specs {
+        instance_size = "M10"
+        node_count    = 3
+      }
+    }
+  }
 }

internal/convert/testdata/adv2v2/basic.out.tf

@@ -1,4 +1,22 @@
-resource "mongodbatlas_advanced_cluster" "basic" {
-  name = "basic"
-  // TODO: missing fields as transformation is not implemented yet
+resource "mongodbatlas_advanced_cluster" "clu" {
+  project_id   = var.project_id
+  name         = "clu"
+  cluster_type = "REPLICASET"
+  replication_specs = [
+    {
+      region_configs = [
+        {
+          priority      = 7
+          provider_name = "AWS"
+          region_name   = "EU_WEST_1"
+          electable_specs = {
+            instance_size = "M10"
+            node_count    = 3
+          }
+        }
+      ]
+    }
+  ]
+
+  # Updated by atlas-cli-plugin-terraform, please review the changes.
 }

internal/convert/testdata/adv2v2/choose_sources.in.tf

@@ -0,0 +1,40 @@
+resource "mongodbatlas_advanced_cluster" "this" {
+  # updated, doesn't have nested attributes
+}
+
+resource "mongodbatlas_advanced_cluster" "this" {
+  # not updated, replication_specs is not a block, resource already in TPF format
+  project_id   = var.project_id
+  name         = "this"
+  cluster_type = "REPLICASET"
+  replication_specs = [
+    {
+      region_configs = [
+        {
+          priority      = 7
+          provider_name = "AWS"
+          region_name   = "EU_WEST_1"
+          electable_specs = {
+            instance_size = "M10"
+            node_count    = 3
+          }
+        }
+      ]
+    }
+  ]
+}
+
+resource "mongodbatlas_advanced_cluster" "this" {
+  # not updated, has an attribute instead of block (timeouts)
+  timeouts = {
+    create = "60m"
+  }
+}
+
+datasource "mongodbatlas_advanced_cluster" "this" {
+  # not updated, data source
+}
+
+resource "another_resource" "this" {
+  # not updated, not advanced cluster
+}