Added support for complex variables

bundle/config/mutator/resolve_resource_references_test.go

@@ -35,7 +35,7 @@ func TestResolveClusterReference(t *testing.T) {
 					},
 				},
 				"some-variable": {
-					Value: &justString,
+					Value: justString,
 				},
 			},
 		},
@@ -53,8 +53,8 @@ func TestResolveClusterReference(t *testing.T) {
 
 	diags := bundle.Apply(context.Background(), b, ResolveResourceReferences())
 	require.NoError(t, diags.Error())
-	require.Equal(t, "1234-5678-abcd", *b.Config.Variables["my-cluster-id-1"].Value)
-	require.Equal(t, "9876-5432-xywz", *b.Config.Variables["my-cluster-id-2"].Value)
+	require.Equal(t, "1234-5678-abcd", b.Config.Variables["my-cluster-id-1"].Value)
+	require.Equal(t, "9876-5432-xywz", b.Config.Variables["my-cluster-id-2"].Value)
 }
 
 func TestResolveNonExistentClusterReference(t *testing.T) {
@@ -69,7 +69,7 @@ func TestResolveNonExistentClusterReference(t *testing.T) {
 					},
 				},
 				"some-variable": {
-					Value: &justString,
+					Value: justString,
 				},
 			},
 		},
@@ -105,7 +105,7 @@ func TestNoLookupIfVariableIsSet(t *testing.T) {
 
 	diags := bundle.Apply(context.Background(), b, ResolveResourceReferences())
 	require.NoError(t, diags.Error())
-	require.Equal(t, "random value", *b.Config.Variables["my-cluster-id"].Value)
+	require.Equal(t, "random value", b.Config.Variables["my-cluster-id"].Value)
 }
 
 func TestResolveServicePrincipal(t *testing.T) {
@@ -132,22 +132,19 @@ func TestResolveServicePrincipal(t *testing.T) {
 
 	diags := bundle.Apply(context.Background(), b, ResolveResourceReferences())
 	require.NoError(t, diags.Error())
-	require.Equal(t, "app-1234", *b.Config.Variables["my-sp"].Value)
+	require.Equal(t, "app-1234", b.Config.Variables["my-sp"].Value)
 }
 
 func TestResolveVariableReferencesInVariableLookups(t *testing.T) {
-	s := func(s string) *string {
-		return &s
-	}
-
+	s := "bar"
 	b := &bundle.Bundle{
 		Config: config.Root{
 			Bundle: config.Bundle{
 				Target: "dev",
 			},
 			Variables: map[string]*variable.Variable{
 				"foo": {
-					Value: s("bar"),
+					Value: s,
 				},
 				"lookup": {
 					Lookup: &variable.Lookup{
@@ -168,7 +165,7 @@ func TestResolveVariableReferencesInVariableLookups(t *testing.T) {
 	diags := bundle.Apply(context.Background(), b, bundle.Seq(ResolveVariableReferencesInLookup(), ResolveResourceReferences()))
 	require.NoError(t, diags.Error())
 	require.Equal(t, "cluster-bar-dev", b.Config.Variables["lookup"].Lookup.Cluster)
-	require.Equal(t, "1234-5678-abcd", *b.Config.Variables["lookup"].Value)
+	require.Equal(t, "1234-5678-abcd", b.Config.Variables["lookup"].Value)
 }
 
 func TestResolveLookupVariableReferencesInVariableLookups(t *testing.T) {
@@ -197,22 +194,15 @@ func TestResolveLookupVariableReferencesInVariableLookups(t *testing.T) {
 }
 
 func TestNoResolveLookupIfVariableSetWithEnvVariable(t *testing.T) {
-	s := func(s string) *string {
-		return &s
-	}
-
 	b := &bundle.Bundle{
 		Config: config.Root{
 			Bundle: config.Bundle{
 				Target: "dev",
 			},
 			Variables: map[string]*variable.Variable{
-				"foo": {
-					Value: s("bar"),
-				},
 				"lookup": {
 					Lookup: &variable.Lookup{
-						Cluster: "cluster-${var.foo}-${bundle.target}",
+						Cluster: "cluster-${bundle.target}",
 					},
 				},
 			},
@@ -227,5 +217,5 @@ func TestNoResolveLookupIfVariableSetWithEnvVariable(t *testing.T) {
 
 	diags := bundle.Apply(ctx, b, bundle.Seq(SetVariables(), ResolveVariableReferencesInLookup(), ResolveResourceReferences()))
 	require.NoError(t, diags.Error())
-	require.Equal(t, "1234-5678-abcd", *b.Config.Variables["lookup"].Value)
+	require.Equal(t, "1234-5678-abcd", b.Config.Variables["lookup"].Value)
 }

bundle/config/mutator/resolve_variable_references_test.go

@@ -43,10 +43,6 @@ func TestResolveVariableReferences(t *testing.T) {
 }
 
 func TestResolveVariableReferencesToBundleVariables(t *testing.T) {
-	s := func(s string) *string {
-		return &s
-	}
-
 	b := &bundle.Bundle{
 		Config: config.Root{
 			Bundle: config.Bundle{
@@ -57,7 +53,7 @@ func TestResolveVariableReferencesToBundleVariables(t *testing.T) {
 			},
 			Variables: map[string]*variable.Variable{
 				"foo": {
-					Value: s("bar"),
+					Value: "bar",
 				},
 			},
 		},

bundle/config/mutator/set_variables.go

@@ -30,6 +30,10 @@ func setVariable(ctx context.Context, v *variable.Variable, name string) diag.Di
 	// case: read and set variable value from process environment
 	envVarName := bundleVarPrefix + name
 	if val, ok := env.Lookup(ctx, envVarName); ok {
+		if v.IsComplex() {
+			return diag.Errorf(`setting via environment variables (%s) is not supported for complex variable %s`, envVarName, name)
+		}
+
 		err := v.Set(val)
 		if err != nil {
 			return diag.Errorf(`failed to assign value "%s" to variable %s from environment variable %s with error: %v`, val, name, envVarName, err)
@@ -45,9 +49,9 @@ func setVariable(ctx context.Context, v *variable.Variable, name string) diag.Di
 
 	// case: Set the variable to its default value
 	if v.HasDefault() {
-		err := v.Set(*v.Default)
+		err := v.Set(v.Default)
 		if err != nil {
-			return diag.Errorf(`failed to assign default value from config "%s" to variable %s with error: %v`, *v.Default, name, err)
+			return diag.Errorf(`failed to assign default value from config "%s" to variable %s with error: %v`, v.Default, name, err)
 		}
 		return nil
 	}

bundle/config/mutator/set_variables_test.go

@@ -15,52 +15,52 @@ func TestSetVariableFromProcessEnvVar(t *testing.T) {
 	defaultVal := "default"
 	variable := variable.Variable{
 		Description: "a test variable",
-		Default:     &defaultVal,
+		Default:     defaultVal,
 	}
 
 	// set value for variable as an environment variable
 	t.Setenv("BUNDLE_VAR_foo", "process-env")
 
 	diags := setVariable(context.Background(), &variable, "foo")
 	require.NoError(t, diags.Error())
-	assert.Equal(t, *variable.Value, "process-env")
+	assert.Equal(t, variable.Value, "process-env")
 }
 
 func TestSetVariableUsingDefaultValue(t *testing.T) {
 	defaultVal := "default"
 	variable := variable.Variable{
 		Description: "a test variable",
-		Default:     &defaultVal,
+		Default:     defaultVal,
 	}
 
 	diags := setVariable(context.Background(), &variable, "foo")
 	require.NoError(t, diags.Error())
-	assert.Equal(t, *variable.Value, "default")
+	assert.Equal(t, variable.Value, "default")
 }
 
 func TestSetVariableWhenAlreadyAValueIsAssigned(t *testing.T) {
 	defaultVal := "default"
 	val := "assigned-value"
 	variable := variable.Variable{
 		Description: "a test variable",
-		Default:     &defaultVal,
-		Value:       &val,
+		Default:     defaultVal,
+		Value:       val,
 	}
 
 	// since a value is already assigned to the variable, it would not be overridden
 	// by the default value
 	diags := setVariable(context.Background(), &variable, "foo")
 	require.NoError(t, diags.Error())
-	assert.Equal(t, *variable.Value, "assigned-value")
+	assert.Equal(t, variable.Value, "assigned-value")
 }
 
 func TestSetVariableEnvVarValueDoesNotOverridePresetValue(t *testing.T) {
 	defaultVal := "default"
 	val := "assigned-value"
 	variable := variable.Variable{
 		Description: "a test variable",
-		Default:     &defaultVal,
-		Value:       &val,
+		Default:     defaultVal,
+		Value:       val,
 	}
 
 	// set value for variable as an environment variable
@@ -70,7 +70,7 @@ func TestSetVariableEnvVarValueDoesNotOverridePresetValue(t *testing.T) {
 	// by the value from environment
 	diags := setVariable(context.Background(), &variable, "foo")
 	require.NoError(t, diags.Error())
-	assert.Equal(t, *variable.Value, "assigned-value")
+	assert.Equal(t, variable.Value, "assigned-value")
 }
 
 func TestSetVariablesErrorsIfAValueCouldNotBeResolved(t *testing.T) {
@@ -92,15 +92,15 @@ func TestSetVariablesMutator(t *testing.T) {
 			Variables: map[string]*variable.Variable{
 				"a": {
 					Description: "resolved to default value",
-					Default:     &defaultValForA,
+					Default:     defaultValForA,
 				},
 				"b": {
 					Description: "resolved from environment vairables",
-					Default:     &defaultValForB,
+					Default:     defaultValForB,
 				},
 				"c": {
 					Description: "has already been assigned a value",
-					Value:       &valForC,
+					Value:       valForC,
 				},
 			},
 		},
@@ -110,7 +110,7 @@ func TestSetVariablesMutator(t *testing.T) {
 
 	diags := bundle.Apply(context.Background(), b, SetVariables())
 	require.NoError(t, diags.Error())
-	assert.Equal(t, "default-a", *b.Config.Variables["a"].Value)
-	assert.Equal(t, "env-var-b", *b.Config.Variables["b"].Value)
-	assert.Equal(t, "assigned-val-c", *b.Config.Variables["c"].Value)
+	assert.Equal(t, "default-a", b.Config.Variables["a"].Value)
+	assert.Equal(t, "env-var-b", b.Config.Variables["b"].Value)
+	assert.Equal(t, "assigned-val-c", b.Config.Variables["c"].Value)
 }

bundle/config/root.go

@@ -263,6 +263,11 @@ func (r *Root) InitializeVariables(vars []string) error {
 		if _, ok := r.Variables[name]; !ok {
 			return fmt.Errorf("variable %s has not been defined", name)
 		}
+
+		if r.Variables[name].IsComplex() {
+			return fmt.Errorf("setting variables of complex type via --var flag is not supported: %s", name)
+		}
+
 		err := r.Variables[name].Set(val)
 		if err != nil {
 			return fmt.Errorf("failed to assign %s to %s: %s", val, name, err)
@@ -415,7 +420,7 @@ func rewriteShorthands(v dyn.Value) (dyn.Value, error) {
 		}
 
 		// For each variable, normalize its contents if it is a single string.
-		return dyn.Map(target, "variables", dyn.Foreach(func(_ dyn.Path, variable dyn.Value) (dyn.Value, error) {
+		return dyn.Map(target, "variables", dyn.Foreach(func(p dyn.Path, variable dyn.Value) (dyn.Value, error) {
 			switch variable.Kind() {
 
 			case dyn.KindString, dyn.KindBool, dyn.KindFloat, dyn.KindInt:
@@ -426,6 +431,21 @@ func rewriteShorthands(v dyn.Value) (dyn.Value, error) {
 					"default": variable,
 				}, variable.Location()), nil
 
+			case dyn.KindMap, dyn.KindSequence:
+				// Check if the original definition of variable has a type field.
+				typeV, err := dyn.GetByPath(v, p.Append(dyn.Key("type")))
+				if err != nil {
+					return variable, nil
+				}
+
+				if typeV.MustString() == "complex" {
+					return dyn.NewValue(map[string]dyn.Value{
+						"default": variable,
+					}, variable.Location()), nil
+				}
+
+				return variable, nil
+
 			default:
 				return variable, nil
 			}

bundle/config/root_test.go

@@ -51,7 +51,7 @@ func TestInitializeVariables(t *testing.T) {
 	root := &Root{
 		Variables: map[string]*variable.Variable{
 			"foo": {
-				Default:     &fooDefault,
+				Default:     fooDefault,
 				Description: "an optional variable since default is defined",
 			},
 			"bar": {
@@ -62,8 +62,8 @@ func TestInitializeVariables(t *testing.T) {
 
 	err := root.InitializeVariables([]string{"foo=123", "bar=456"})
 	assert.NoError(t, err)
-	assert.Equal(t, "123", *(root.Variables["foo"].Value))
-	assert.Equal(t, "456", *(root.Variables["bar"].Value))
+	assert.Equal(t, "123", (root.Variables["foo"].Value))
+	assert.Equal(t, "456", (root.Variables["bar"].Value))
 }
 
 func TestInitializeVariablesWithAnEqualSignInValue(t *testing.T) {
@@ -77,7 +77,7 @@ func TestInitializeVariablesWithAnEqualSignInValue(t *testing.T) {
 
 	err := root.InitializeVariables([]string{"foo=123=567"})
 	assert.NoError(t, err)
-	assert.Equal(t, "123=567", *(root.Variables["foo"].Value))
+	assert.Equal(t, "123=567", (root.Variables["foo"].Value))
 }
 
 func TestInitializeVariablesInvalidFormat(t *testing.T) {

bundle/config/variable/variable.go

@@ -2,12 +2,27 @@ package variable
 
 import (
 	"fmt"
+	"reflect"
+)
+
+// We are using `any` because since introduction of complex variables,
+// variables can be of any type.
+// Type alias is used to make it easier to understand the code.
+type VariableValue = any
+
+type VariableType string
+
+const (
+	VariableTypeComplex VariableType = "complex"
 )
 
 // An input variable for the bundle config
 type Variable struct {
+	// A type of the variable. This is used to validate the value of the variable
+	Type VariableType `json:"type,omitempty"`
+
 	// A default value which then makes the variable optional
-	Default *string `json:"default,omitempty"`
+	Default VariableValue `json:"default,omitempty"`
 
 	// Documentation for this input variable
 	Description string `json:"description,omitempty"`
@@ -21,7 +36,7 @@ type Variable struct {
 	// 4. Default value defined in variable definition
 	// 5. Throw error, since if no default value is defined, then the variable
 	//    is required
-	Value *string `json:"value,omitempty" bundle:"readonly"`
+	Value VariableValue `json:"value,omitempty" bundle:"readonly"`
 
 	// The value of this field will be used to lookup the resource by name
 	// And assign the value of the variable to ID of the resource found.
@@ -39,10 +54,24 @@ func (v *Variable) HasValue() bool {
 	return v.Value != nil
 }
 
-func (v *Variable) Set(val string) error {
+func (v *Variable) Set(val VariableValue) error {
 	if v.HasValue() {
-		return fmt.Errorf("variable has already been assigned value: %s", *v.Value)
+		return fmt.Errorf("variable has already been assigned value: %s", v.Value)
 	}
-	v.Value = &val
+
+	rv := reflect.ValueOf(val)
+	switch rv.Kind() {
+	case reflect.Struct, reflect.Array, reflect.Slice, reflect.Map:
+		if v.Type != VariableTypeComplex {
+			return fmt.Errorf("variable type is not complex")
+		}
+	}
+
+	v.Value = val
+
 	return nil
 }
+
+func (v *Variable) IsComplex() bool {
+	return v.Type == VariableTypeComplex
+}