Minimum changes to component.Host, to allow split of the component package

.chloggen/deprecatecomp.yaml

@@ -0,0 +1,11 @@
+# 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: component
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Deprecate `component.Receiver`, `component.Processor`, and `component.Exporter`.
+
+# One or more tracking issues or pull requests related to the change
+issues: [6553]

.chloggen/draftminhost.yaml

@@ -0,0 +1,11 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: component
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "`component.Extension` is temporarily set to be an alias of `component.Component` which will be reverted once it's moved to the `extension` package. Change your `component.Host.GetExtensions()` implementation to return `map[ID]component.Component` instead of `map[ID]component.Extension`"
+
+# One or more tracking issues or pull requests related to the change
+issues: [6553]

component/componenttest/nop_host.go

@@ -32,10 +32,10 @@ func (nh *nopHost) GetFactory(_ component.Kind, _ component.Type) component.Fact
 	return nil
 }
 
-func (nh *nopHost) GetExtensions() map[component.ID]component.Extension {
+func (nh *nopHost) GetExtensions() map[component.ID]component.Component {
 	return nil
 }
 
-func (nh *nopHost) GetExporters() map[component.DataType]map[component.ID]component.Exporter {
+func (nh *nopHost) GetExporters() map[component.DataType]map[component.ID]component.Component {
 	return nil
 }

component/exporter.go

@@ -34,26 +34,24 @@ func UnmarshalExporterConfig(conf *confmap.Conf, cfg ExporterConfig) error {
 	return unmarshal(conf, cfg)
 }
 
-// Exporter exports telemetry data from the collector to a destination.
-type Exporter interface {
-	Component
-}
+// Deprecated: [v0.65.0] unnecessary interface, will be removed.
+type Exporter = Component
 
 // TracesExporter is an Exporter that can consume traces.
 type TracesExporter interface {
-	Exporter
+	Component
 	consumer.Traces
 }
 
 // MetricsExporter is an Exporter that can consume metrics.
 type MetricsExporter interface {
-	Exporter
+	Component
 	consumer.Metrics
 }
 
 // LogsExporter is an Exporter that can consume logs.
 type LogsExporter interface {
-	Exporter
+	Component
 	consumer.Logs
 }
 

component/extension.go

@@ -36,9 +36,7 @@ func UnmarshalExtensionConfig(conf *confmap.Conf, cfg ExtensionConfig) error {
 // Extension is the interface for objects hosted by the OpenTelemetry Collector that
 // don't participate directly on data pipelines but provide some functionality
 // to the service, examples: health check endpoint, z-pages, etc.
-type Extension interface {
-	Component
-}
+type Extension = Component
 
 // PipelineWatcher is an extra interface for Extension hosted by the OpenTelemetry
 // Collector that is to be implemented by extensions interested in changes to pipeline

component/host.go

@@ -45,7 +45,7 @@ type Host interface {
 	//
 	// GetExtensions can be called by the component anytime after Component.Start() begins and
 	// until Component.Shutdown() ends.
-	GetExtensions() map[ID]Extension
+	GetExtensions() map[ID]Component
 
 	// GetExporters returns the map of exporters. Only enabled and created exporters will be returned.
 	// Typically is used to find exporters by type or by full config name. Both cases
@@ -58,5 +58,5 @@ type Host interface {
 	//
 	// GetExporters can be called by the component anytime after Component.Start() begins and
 	// until Component.Shutdown() ends.
-	GetExporters() map[DataType]map[ID]Exporter
+	GetExporters() map[DataType]map[ID]Component
 }

component/processor.go

@@ -34,27 +34,24 @@ func UnmarshalProcessorConfig(conf *confmap.Conf, cfg ProcessorConfig) error {
 	return unmarshal(conf, cfg)
 }
 
-// Processor defines the common functions that must be implemented by TracesProcessor
-// and MetricsProcessor.
-type Processor interface {
-	Component
-}
+// Deprecated: [v0.65.0] unnecessary interface, will be removed.
+type Processor = Component
 
 // TracesProcessor is a processor that can consume traces.
 type TracesProcessor interface {
-	Processor
+	Component
 	consumer.Traces
 }
 
 // MetricsProcessor is a processor that can consume metrics.
 type MetricsProcessor interface {
-	Processor
+	Component
 	consumer.Metrics
 }
 
 // LogsProcessor is a processor that can consume logs.
 type LogsProcessor interface {
-	Processor
+	Component
 	consumer.Logs
 }
 

component/receiver.go

@@ -72,17 +72,16 @@ func UnmarshalReceiverConfig(conf *confmap.Conf, cfg ReceiverConfig) error {
 //
 // This ensures there are strong delivery guarantees once the data is acknowledged
 // by the Collector.
-type Receiver interface {
-	Component
-}
+// Deprecated: [v0.65.0] unnecessary interface, will be removed.
+type Receiver = Component
 
 // A TracesReceiver receives traces.
 // Its purpose is to translate data from any format to the collector's internal trace format.
 // TracesReceiver feeds a consumer.Traces with data.
 //
 // For example it could be Zipkin data source which translates Zipkin spans into ptrace.Traces.
 type TracesReceiver interface {
-	Receiver
+	Component
 }
 
 // A MetricsReceiver receives metrics.
@@ -91,7 +90,7 @@ type TracesReceiver interface {
 //
 // For example it could be Prometheus data source which translates Prometheus metrics into pmetric.Metrics.
 type MetricsReceiver interface {
-	Receiver
+	Component
 }
 
 // A LogsReceiver receives logs.
@@ -100,7 +99,7 @@ type MetricsReceiver interface {
 //
 // For example a LogsReceiver can read syslogs and convert them into plog.Logs.
 type LogsReceiver interface {
-	Receiver
+	Component
 }
 
 // ReceiverCreateSettings configures Receiver creators.

config/configauth/configauth.go

@@ -35,7 +35,7 @@ type Authentication struct {
 
 // GetServerAuthenticator attempts to select the appropriate ServerAuthenticator from the list of extensions,
 // based on the requested extension name. If an authenticator is not found, an error is returned.
-func (a Authentication) GetServerAuthenticator(extensions map[component.ID]component.Extension) (ServerAuthenticator, error) {
+func (a Authentication) GetServerAuthenticator(extensions map[component.ID]component.Component) (ServerAuthenticator, error) {
 	if ext, found := extensions[a.AuthenticatorID]; found {
 		if auth, ok := ext.(ServerAuthenticator); ok {
 			return auth, nil
@@ -49,7 +49,7 @@ func (a Authentication) GetServerAuthenticator(extensions map[component.ID]compo
 // GetClientAuthenticator attempts to select the appropriate ClientAuthenticator from the list of extensions,
 // based on the component id of the extension. If an authenticator is not found, an error is returned.
 // This should be only used by HTTP clients.
-func (a Authentication) GetClientAuthenticator(extensions map[component.ID]component.Extension) (ClientAuthenticator, error) {
+func (a Authentication) GetClientAuthenticator(extensions map[component.ID]component.Component) (ClientAuthenticator, error) {
 	if ext, found := extensions[a.AuthenticatorID]; found {
 		if auth, ok := ext.(ClientAuthenticator); ok {
 			return auth, nil

config/configauth/configauth_test.go

@@ -45,7 +45,7 @@ func TestGetServerAuthenticator(t *testing.T) {
 			cfg := &Authentication{
 				AuthenticatorID: component.NewID("mock"),
 			}
-			ext := map[component.ID]component.Extension{
+			ext := map[component.ID]component.Component{
 				component.NewID("mock"): tC.authenticator,
 			}
 
@@ -68,7 +68,7 @@ func TestGetServerAuthenticatorFails(t *testing.T) {
 		AuthenticatorID: component.NewID("does-not-exist"),
 	}
 
-	authenticator, err := cfg.GetServerAuthenticator(map[component.ID]component.Extension{})
+	authenticator, err := cfg.GetServerAuthenticator(map[component.ID]component.Component{})
 	assert.ErrorIs(t, err, errAuthenticatorNotFound)
 	assert.Nil(t, authenticator)
 }
@@ -96,7 +96,7 @@ func TestGetClientAuthenticator(t *testing.T) {
 			cfg := &Authentication{
 				AuthenticatorID: component.NewID("mock"),
 			}
-			ext := map[component.ID]component.Extension{
+			ext := map[component.ID]component.Component{
 				component.NewID("mock"): tC.authenticator,
 			}
 
@@ -118,7 +118,7 @@ func TestGetClientAuthenticatorFails(t *testing.T) {
 	cfg := &Authentication{
 		AuthenticatorID: component.NewID("does-not-exist"),
 	}
-	authenticator, err := cfg.GetClientAuthenticator(map[component.ID]component.Extension{})
+	authenticator, err := cfg.GetClientAuthenticator(map[component.ID]component.Component{})
 	assert.ErrorIs(t, err, errAuthenticatorNotFound)
 	assert.Nil(t, authenticator)
 }

config/configgrpc/configgrpc_test.go

@@ -91,7 +91,7 @@ func TestAllGrpcClientSettings(t *testing.T) {
 				Auth:            &configauth.Authentication{AuthenticatorID: component.NewID("testauth")},
 			},
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("testauth"): &configauth.MockClientAuthenticator{},
 				},
 			},
@@ -119,7 +119,7 @@ func TestAllGrpcClientSettings(t *testing.T) {
 				Auth:            &configauth.Authentication{AuthenticatorID: component.NewID("testauth")},
 			},
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("testauth"): &configauth.MockClientAuthenticator{},
 				},
 			},
@@ -147,7 +147,7 @@ func TestAllGrpcClientSettings(t *testing.T) {
 				Auth:            &configauth.Authentication{AuthenticatorID: component.NewID("testauth")},
 			},
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("testauth"): &configauth.MockClientAuthenticator{},
 				},
 			},
@@ -216,7 +216,7 @@ func TestGrpcServerAuthSettings(t *testing.T) {
 		AuthenticatorID: component.NewID("mock"),
 	}
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{
+		ext: map[component.ID]component.Component{
 			component.NewID("mock"): configauth.NewServerAuthenticator(),
 		},
 	}
@@ -295,7 +295,7 @@ func TestGRPCClientSettingsError(t *testing.T) {
 				Endpoint: "localhost:1234",
 				Auth:     &configauth.Authentication{AuthenticatorID: component.NewID("doesntexist")},
 			},
-			host: &mockHost{ext: map[component.ID]component.Extension{}},
+			host: &mockHost{ext: map[component.ID]component.Component{}},
 		},
 		{
 			err: "no extensions configuration available",
@@ -1075,9 +1075,9 @@ func tempSocketName(t *testing.T) string {
 
 type mockHost struct {
 	component.Host
-	ext map[component.ID]component.Extension
+	ext map[component.ID]component.Component
 }
 
-func (nh *mockHost) GetExtensions() map[component.ID]component.Extension {
+func (nh *mockHost) GetExtensions() map[component.ID]component.Component {
 	return nh.ext
 }

config/confighttp/confighttp_test.go

@@ -50,7 +50,7 @@ func (c *customRoundTripper) RoundTrip(request *http.Request) (*http.Response, e
 
 func TestAllHTTPClientSettings(t *testing.T) {
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{
+		ext: map[component.ID]component.Component{
 			component.NewID("testauth"): &configauth.MockClientAuthenticator{ResultRoundTripper: &customRoundTripper{}},
 		},
 	}
@@ -160,7 +160,7 @@ func TestAllHTTPClientSettings(t *testing.T) {
 
 func TestPartialHTTPClientSettings(t *testing.T) {
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{
+		ext: map[component.ID]component.Component{
 			component.NewID("testauth"): &configauth.MockClientAuthenticator{ResultRoundTripper: &customRoundTripper{}},
 		},
 	}
@@ -211,7 +211,7 @@ func TestDefaultHTTPClientSettings(t *testing.T) {
 
 func TestHTTPClientSettingsError(t *testing.T) {
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{},
+		ext: map[component.ID]component.Component{},
 	}
 	tests := []struct {
 		settings HTTPClientSettings
@@ -274,7 +274,7 @@ func TestHTTPClientSettingWithAuthConfig(t *testing.T) {
 			},
 			shouldErr: false,
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("mock"): &configauth.MockClientAuthenticator{
 						ResultRoundTripper: &customRoundTripper{},
 					},
@@ -289,7 +289,7 @@ func TestHTTPClientSettingWithAuthConfig(t *testing.T) {
 			},
 			shouldErr: true,
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("mock"): &configauth.MockClientAuthenticator{ResultRoundTripper: &customRoundTripper{}},
 				},
 			},
@@ -311,7 +311,7 @@ func TestHTTPClientSettingWithAuthConfig(t *testing.T) {
 			},
 			shouldErr: false,
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("mock"): &configauth.MockClientAuthenticator{ResultRoundTripper: &customRoundTripper{}},
 				},
 			},
@@ -324,7 +324,7 @@ func TestHTTPClientSettingWithAuthConfig(t *testing.T) {
 			},
 			shouldErr: true,
 			host: &mockHost{
-				ext: map[component.ID]component.Extension{
+				ext: map[component.ID]component.Component{
 					component.NewID("mock"): &configauth.MockClientAuthenticator{
 						ResultRoundTripper: &customRoundTripper{}, MustError: true},
 				},
@@ -737,7 +737,7 @@ func TestHttpCorsWithAuthentication(t *testing.T) {
 	}
 
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{
+		ext: map[component.ID]component.Component{
 			component.NewID("mock"): configauth.NewServerAuthenticator(
 				configauth.WithAuthenticate(func(ctx context.Context, headers map[string][]string) (context.Context, error) {
 					return ctx, errors.New("authentication failed")
@@ -932,7 +932,7 @@ func TestServerAuth(t *testing.T) {
 	}
 
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{
+		ext: map[component.ID]component.Component{
 			component.NewID("mock"): configauth.NewServerAuthenticator(
 				configauth.WithAuthenticate(func(ctx context.Context, headers map[string][]string) (context.Context, error) {
 					authCalled = true
@@ -979,7 +979,7 @@ func TestFailedServerAuth(t *testing.T) {
 		},
 	}
 	host := &mockHost{
-		ext: map[component.ID]component.Extension{
+		ext: map[component.ID]component.Component{
 			component.NewID("mock"): configauth.NewServerAuthenticator(
 				configauth.WithAuthenticate(func(ctx context.Context, headers map[string][]string) (context.Context, error) {
 					return ctx, errors.New("authentication failed")
@@ -1002,10 +1002,10 @@ func TestFailedServerAuth(t *testing.T) {
 
 type mockHost struct {
 	component.Host
-	ext map[component.ID]component.Extension
+	ext map[component.ID]component.Component
 }
 
-func (nh *mockHost) GetExtensions() map[component.ID]component.Extension {
+func (nh *mockHost) GetExtensions() map[component.ID]component.Component {
 	return nh.ext
 }
 

exporter/exporterhelper/queued_retry.go

@@ -127,7 +127,7 @@ func newQueuedRetrySender(id component.ID, signal component.DataType, qCfg Queue
 	return qrs
 }
 
-func getStorageExtension(extensions map[component.ID]component.Extension, storageID component.ID) (storage.Extension, error) {
+func getStorageExtension(extensions map[component.ID]component.Component, storageID component.ID) (storage.Extension, error) {
 	if ext, found := extensions[storageID]; found {
 		if storageExt, ok := ext.(storage.Extension); ok {
 			return storageExt, nil