[extension] Error out if passed extension.Settings has incorrect type

.chloggen/mx-psi_extensiontest-withtype.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: deprecation
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: extensiontest
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Deprecate `extensiontest.NewNopSettings` in favor of `extensiontest.NewNopSettingsWithType`
+
+# One or more tracking issues or pull requests related to the change
+issues: [12305]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

.chloggen/mx-psi_type-mismatch.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: extension
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Explicitly error out at extension creation time if there is a type mismatch.
+
+# One or more tracking issues or pull requests related to the change
+issues: [12305]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

cmd/mdatagen/internal/templates/component_test.go.tmpl

@@ -60,8 +60,10 @@ import (
 	{{- end }}
 )
 
+var typ = component.MustNewType("{{ .Type }}")
+
 func TestComponentFactoryType(t *testing.T) {
-	require.Equal(t, "{{ .Type }}", NewFactory().Type().String())
+	require.Equal(t, typ, NewFactory().Type())
 }
 
 func TestComponentConfigStruct(t *testing.T) {
@@ -412,7 +414,7 @@ func TestComponentLifecycle(t *testing.T) {
 
 	{{- if not .Tests.SkipShutdown }}
 	t.Run("shutdown", func(t *testing.T) {
-		e, err := factory.Create(context.Background(), extensiontest.NewNopSettings(), cfg)
+		e, err := factory.Create(context.Background(), extensiontest.NewNopSettingsWithType(typ), cfg)
 		require.NoError(t, err)
 		err = e.Shutdown(context.Background())
 		require.NoError(t, err)
@@ -421,12 +423,12 @@ func TestComponentLifecycle(t *testing.T) {
 
 	{{- if not .Tests.SkipLifecycle }}
 	t.Run("lifecycle", func(t *testing.T) {
-		firstExt, err := factory.Create(context.Background(), extensiontest.NewNopSettings(), cfg)
+		firstExt, err := factory.Create(context.Background(), extensiontest.NewNopSettingsWithType(typ), cfg)
 		require.NoError(t, err)
 		require.NoError(t, firstExt.Start(context.Background(), {{ .Tests.Host }}))
 		require.NoError(t, firstExt.Shutdown(context.Background()))
 
-		secondExt, err := factory.Create(context.Background(), extensiontest.NewNopSettings(), cfg)
+		secondExt, err := factory.Create(context.Background(), extensiontest.NewNopSettingsWithType(typ), cfg)
 		require.NoError(t, err)
 		require.NoError(t, secondExt.Start(context.Background(), {{ .Tests.Host }}))
 		require.NoError(t, secondExt.Shutdown(context.Background()))

extension/extension.go

@@ -32,6 +32,7 @@ type Settings struct {
 type CreateFunc func(context.Context, Settings, component.Config) (Extension, error)
 
 // Create implements Factory.Create.
+// Deprecated: [v0.120.0] No longer used, will be removed.
 func (f CreateFunc) Create(ctx context.Context, set Settings, cfg component.Config) (Extension, error) {
 	return f(ctx, set, cfg)
 }
@@ -51,7 +52,7 @@ type Factory interface {
 type factory struct {
 	cfgType component.Type
 	component.CreateDefaultConfigFunc
-	CreateFunc
+	createFunc         CreateFunc
 	extensionStability component.StabilityLevel
 }
 
@@ -65,6 +66,14 @@ func (f *factory) Stability() component.StabilityLevel {
 	return f.extensionStability
 }
 
+func (f *factory) Create(ctx context.Context, set Settings, cfg component.Config) (Extension, error) {
+	if set.ID.Type() != f.cfgType {
+		return nil, fmt.Errorf("component type mismatch: component ID %q does not have type %q", set.ID, f.cfgType)
+	}
+
+	return f.createFunc(ctx, set, cfg)
+}
+
 // NewFactory returns a new Factory  based on this configuration.
 func NewFactory(
 	cfgType component.Type,
@@ -75,7 +84,7 @@ func NewFactory(
 	return &factory{
 		cfgType:                 cfgType,
 		CreateDefaultConfigFunc: createDefaultConfig,
-		CreateFunc:              createServiceExtension,
+		createFunc:              createServiceExtension,
 		extensionStability:      sl,
 	}
 }

extension/extension_test.go

@@ -35,9 +35,12 @@ func TestNewFactory(t *testing.T) {
 	assert.EqualValues(t, &defaultCfg, factory.CreateDefaultConfig())
 
 	assert.Equal(t, component.StabilityLevelDevelopment, factory.Stability())
-	ext, err := factory.Create(context.Background(), Settings{}, &defaultCfg)
+	ext, err := factory.Create(context.Background(), Settings{ID: component.NewID(testType)}, &defaultCfg)
 	require.NoError(t, err)
 	assert.Same(t, nopExtensionInstance, ext)
+
+	_, err = factory.Create(context.Background(), Settings{ID: component.NewID(component.MustNewType("mismatch"))}, &defaultCfg)
+	require.Error(t, err)
 }
 
 func TestMakeFactoryMap(t *testing.T) {

extension/extensiontest/nop_extension.go

@@ -13,12 +13,19 @@ import (
 	"go.opentelemetry.io/collector/extension"
 )
 
-var nopType = component.MustNewType("nop")
+// NopType is the type of the nop extension.
+var NopType = component.MustNewType("nop")
 
 // NewNopSettings returns a new nop settings for extension.Factory Create* functions.
+// Deprecated: [v0.120.0] Use NewNopSettingsWithType(NopType) instead.
 func NewNopSettings() extension.Settings {
+	return NewNopSettingsWithType(NopType)
+}
+
+// NewNopSettings returns a new nop settings for extension.Factory Create* functions with the given type.
+func NewNopSettingsWithType(ty component.Type) extension.Settings {
 	return extension.Settings{
-		ID:                component.NewIDWithName(nopType, uuid.NewString()),
+		ID:                component.NewIDWithName(ty, uuid.NewString()),
 		TelemetrySettings: componenttest.NewNopTelemetrySettings(),
 		BuildInfo:         component.NewDefaultBuildInfo(),
 	}
@@ -27,7 +34,7 @@ func NewNopSettings() extension.Settings {
 // NewNopFactory returns an extension.Factory that constructs nop extensions.
 func NewNopFactory() extension.Factory {
 	return extension.NewFactory(
-		nopType,
+		NopType,
 		func() component.Config {
 			return &nopConfig{}
 		},

extension/memorylimiterextension/factory_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/component/componenttest"
 	"go.opentelemetry.io/collector/extension/extensiontest"
 	"go.opentelemetry.io/collector/internal/memorylimiter"
@@ -37,7 +38,10 @@ func TestCreate(t *testing.T) {
 	pCfg.MemorySpikeLimitMiB = 1907
 	pCfg.CheckInterval = 100 * time.Millisecond
 
-	tp, err := factory.Create(context.Background(), extensiontest.NewNopSettings(), cfg)
+	set := extensiontest.NewNopSettings()
+	set.ID = component.NewID(factory.Type())
+
+	tp, err := factory.Create(context.Background(), set, cfg)
 	require.NoError(t, err)
 	assert.NotNil(t, tp)
 	// test if we can shutdown a monitoring routine that has not started

extension/zpagesextension/factory_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/component/componenttest"
 	"go.opentelemetry.io/collector/config/confighttp"
 	"go.opentelemetry.io/collector/extension/extensiontest"
@@ -35,7 +36,9 @@ func TestFactoryCreate(t *testing.T) {
 	cfg := createDefaultConfig().(*Config)
 	cfg.ServerConfig.Endpoint = testutil.GetAvailableLocalAddress(t)
 
-	ext, err := create(context.Background(), extensiontest.NewNopSettings(), cfg)
+	set := extensiontest.NewNopSettings()
+	set.ID = component.NewID(NewFactory().Type())
+	ext, err := create(context.Background(), set, cfg)
 	require.NoError(t, err)
 	require.NotNil(t, ext)
 }