fix(provider): detect source code drift and validate package/function references

terraform/provider/internal/resources/function_resource.go

@@ -2,7 +2,9 @@ package resources
 
 import (
 	"context"
+	"encoding/base64"
 	"fmt"
+	"strings"
 
 	"github.com/hashicorp/terraform-plugin-framework/path"
 	"github.com/hashicorp/terraform-plugin-framework/resource"
@@ -107,6 +109,22 @@ func (r *FunctionResource) Create(ctx context.Context, req resource.CreateReques
 	}
 
 	namespace := resolveNamespace(plan.Namespace, r.client.Namespace)
+	if err := ensureEnvironmentExists(ctx, r.client, namespace, plan.Environment.ValueString()); err != nil {
+		resp.Diagnostics.AddError("Ошибка валидации Environment для Function", err.Error())
+		return
+	}
+
+	pkg, err := ensurePackageExists(ctx, r.client, namespace, plan.PackageName.ValueString())
+	if err != nil {
+		resp.Diagnostics.AddError("Ошибка валидации Package для Function", err.Error())
+		return
+	}
+
+	if err := validateEntrypointAgainstPackageSource(plan.Entrypoint.ValueString(), pkg); err != nil {
+		resp.Diagnostics.AddError("Ошибка валидации entrypoint", err.Error())
+		return
+	}
+
 	functionObject := functionToUnstructured(plan, namespace)
 
 	createdFunction, err := r.client.CreateFunction(ctx, functionObject)
@@ -152,6 +170,22 @@ func (r *FunctionResource) Update(ctx context.Context, req resource.UpdateReques
 	}
 
 	namespace := resolveNamespace(plan.Namespace, r.client.Namespace)
+	if err := ensureEnvironmentExists(ctx, r.client, namespace, plan.Environment.ValueString()); err != nil {
+		resp.Diagnostics.AddError("Ошибка валидации Environment для Function", err.Error())
+		return
+	}
+
+	pkg, err := ensurePackageExists(ctx, r.client, namespace, plan.PackageName.ValueString())
+	if err != nil {
+		resp.Diagnostics.AddError("Ошибка валидации Package для Function", err.Error())
+		return
+	}
+
+	if err := validateEntrypointAgainstPackageSource(plan.Entrypoint.ValueString(), pkg); err != nil {
+		resp.Diagnostics.AddError("Ошибка валидации entrypoint", err.Error())
+		return
+	}
+
 	existingFunction, err := r.client.GetFunction(ctx, namespace, plan.Name.ValueString())
 	if err != nil {
 		resp.Diagnostics.AddError("Ошибка получения Function перед обновлением", err.Error())
@@ -254,3 +288,47 @@ func unstructuredToFunctionModel(functionObject *unstructured.Unstructured, base
 
 	return state
 }
+
+func validateEntrypointAgainstPackageSource(entrypoint string, pkg *unstructured.Unstructured) error {
+	parts := strings.Split(entrypoint, ".")
+	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
+		return fmt.Errorf("entrypoint %q должен иметь формат module.function", entrypoint)
+	}
+
+	if parts[0] != "main" {
+		return nil
+	}
+
+	literalSource, found, err := unstructured.NestedString(pkg.Object, "spec", "deployment", "literal")
+	if err != nil || !found || literalSource == "" {
+		return nil
+	}
+
+	literalBytes, err := base64.StdEncoding.DecodeString(literalSource)
+	if err != nil {
+		return nil
+	}
+
+	source := string(literalBytes)
+	if looksLikePythonSource(source) {
+		signature := fmt.Sprintf("def %s(", parts[1])
+		if !strings.Contains(source, signature) {
+			return fmt.Errorf("entrypoint %q не найден в Python исходнике пакета (ожидался %q)", entrypoint, signature)
+		}
+	}
+
+	return nil
+}
+
+func looksLikePythonSource(source string) bool {
+	trimmed := strings.TrimSpace(source)
+	if strings.HasPrefix(trimmed, "def ") || strings.Contains(source, "\ndef ") {
+		return true
+	}
+
+	if strings.Contains(source, "import ") && !strings.Contains(source, "func ") && !strings.Contains(source, "module.exports") {
+		return true
+	}
+
+	return false
+}