Add the rest of V2 factories and interfaces (#626)

- Added V2 metric factories and interfaces for receivers and exporters.
- Added V2 factories and interfaces for processors.
- Creation methods in V2 factories accept a CreationParams struct to
  allow for easier addition of new parameters in the future without
  breaking the interface.

All changes are uniform with previously introduced initial batch of
V2 factories and interfaces (except introduction of CreationParams).

Issue: https://github.com/open-telemetry/opentelemetry-collector/issues/478

consumer/consumer.go

@@ -33,7 +33,7 @@ type MetricsConsumer interface {
 // MetricsConsumerV2 is the new metrics consumer interface that receives data.MetricData, processes it
 // as needed, and sends it to the next processing node if any or to the destination.
 type MetricsConsumerV2 interface {
-	ConsumeMetricsData(ctx context.Context, md data.MetricData) error
+	ConsumeMetricsV2(ctx context.Context, md data.MetricData) error
 }
 
 // BaseTraceConsumer defines a common interface for TraceConsumer and TraceConsumerV2.

exporter/exporter.go

@@ -42,3 +42,9 @@ type MetricsExporter interface {
 	consumer.MetricsConsumer
 	Exporter
 }
+
+// MetricsExporterV2 is a MetricsConsumerV2 that is also an Exporter.
+type MetricsExporterV2 interface {
+	consumer.MetricsConsumerV2
+	Exporter
+}

exporter/factory.go

@@ -15,6 +15,7 @@
 package exporter
 
 import (
+	"context"
 	"fmt"
 
 	"go.uber.org/zap"
@@ -32,7 +33,7 @@ type BaseFactory interface {
 	// configuration and should not cause side-effects that prevent the creation
 	// of multiple instances of the Exporter.
 	// The object returned by this method needs to pass the checks implemented by
-	// 'conifgcheck.ValidateConfig'. It is recommended to have such check in the
+	// 'configcheck.ValidateConfig'. It is recommended to have such check in the
 	// tests of any implementation of the Factory interface.
 	CreateDefaultConfig() configmodels.Exporter
 }
@@ -48,6 +49,13 @@ type Factory interface {
 	CreateMetricsExporter(logger *zap.Logger, cfg configmodels.Exporter) (MetricsExporter, error)
 }
 
+// CreationParams is passed to Create* functions in FactoryV2.
+type CreationParams struct {
+	// Logger that the factory can use during creation and can pass to the created
+	// component to be used later as well.
+	Logger *zap.Logger
+}
+
 // FactoryV2 can create TraceExporterV2 and MetricsExporterV2. This is the
 // new factory type that can create new style exporters.
 type FactoryV2 interface {
@@ -56,9 +64,12 @@ type FactoryV2 interface {
 	// CreateTraceReceiverV2 creates a trace receiver based on this config.
 	// If the receiver type does not support tracing or if the config is not valid
 	// error will be returned instead.
-	CreateTraceExporterV2(logger *zap.Logger, cfg configmodels.Exporter) (TraceExporterV2, error)
+	CreateTraceExporterV2(ctx context.Context, params CreationParams, cfg configmodels.Exporter) (TraceExporterV2, error)
 
-	// TODO: Add CreateMetricsExporterV2.
+	// CreateMetricsExporterV2 creates a metrics receiver based on this config.
+	// If the receiver type does not support metrics or if the config is not valid
+	// error will be returned instead.
+	CreateMetricsExporterV2(ctx context.Context, params CreationParams, cfg configmodels.Exporter) (MetricsExporterV2, error)
 }
 
 // Build takes a list of exporter factories and returns a map of type map[string]Factory

extension/factory.go

@@ -32,7 +32,7 @@ type Factory interface {
 	// configuration and should not cause side-effects that prevent the creation
 	// of multiple instances of the Extension.
 	// The object returned by this method needs to pass the checks implemented by
-	// 'conifgcheck.ValidateConfig'. It is recommended to have such check in the
+	// 'configcheck.ValidateConfig'. It is recommended to have such check in the
 	// tests of any implementation of the Factory interface.
 	CreateDefaultConfig() configmodels.Extension
 

processor/factory.go

@@ -15,6 +15,7 @@
 package processor
 
 import (
+	"context"
 	"fmt"
 
 	"go.uber.org/zap"
@@ -23,8 +24,8 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector/consumer"
 )
 
-// Factory is factory interface for processors.
-type Factory interface {
+// BaseFactory defines the common functions for all processor factories.
+type BaseFactory interface {
 	// Type gets the type of the Processor created by this factory.
 	Type() string
 
@@ -33,9 +34,14 @@ type Factory interface {
 	// configuration and should not cause side-effects that prevent the creation
 	// of multiple instances of the Processor.
 	// The object returned by this method needs to pass the checks implemented by
-	// 'conifgcheck.ValidateConfig'. It is recommended to have such check in the
+	// 'configcheck.ValidateConfig'. It is recommended to have such check in the
 	// tests of any implementation of the Factory interface.
 	CreateDefaultConfig() configmodels.Processor
+}
+
+// Factory is factory interface for processors.
+type Factory interface {
+	BaseFactory
 
 	// CreateTraceProcessor creates a trace processor based on this config.
 	// If the processor type does not support tracing or if the config is not valid
@@ -50,6 +56,31 @@ type Factory interface {
 		cfg configmodels.Processor) (MetricsProcessor, error)
 }
 
+// CreationParams is passed to Create* functions in FactoryV2.
+type CreationParams struct {
+	// Logger that the factory can use during creation and can pass to the created
+	// component to be used later as well.
+	Logger *zap.Logger
+}
+
+// FactoryV2 is factory interface for processors. This is the
+// new factory type that can create new style processors.
+type FactoryV2 interface {
+	BaseFactory
+
+	// CreateTraceProcessorV2 creates a trace processor based on this config.
+	// If the processor type does not support tracing or if the config is not valid
+	// error will be returned instead.
+	CreateTraceProcessorV2(ctx context.Context, params CreationParams,
+		nextConsumer consumer.TraceConsumerV2, cfg configmodels.Processor) (TraceProcessorV2, error)
+
+	// CreateMetricsProcessorV2 creates a metrics processor based on this config.
+	// If the processor type does not support metrics or if the config is not valid
+	// error will be returned instead.
+	CreateMetricsProcessorV2(ctx context.Context, params CreationParams,
+		nextConsumer consumer.MetricsConsumerV2, cfg configmodels.Processor) (MetricsProcessorV2, error)
+}
+
 // Build takes a list of processor factories and returns a map of type map[string]Factory
 // with factory type as keys. It returns a non-nil error when more than one factories
 // have the same type.

processor/processor.go

@@ -41,6 +41,18 @@ type MetricsProcessor interface {
 	Processor
 }
 
+// TraceProcessorV2 composes TraceConsumerV2 with some additional processor-specific functions.
+type TraceProcessorV2 interface {
+	consumer.TraceConsumerV2
+	Processor
+}
+
+// MetricsProcessorV2 composes MetricsConsumerV2 with some additional processor-specific functions.
+type MetricsProcessorV2 interface {
+	consumer.MetricsConsumerV2
+	Processor
+}
+
 type DualTypeProcessor interface {
 	consumer.TraceConsumer
 	consumer.MetricsConsumer

receiver/factory.go

@@ -76,6 +76,13 @@ type Factory interface {
 		consumer consumer.MetricsConsumer) (MetricsReceiver, error)
 }
 
+// CreationParams is passed to Create* functions in FactoryV2.
+type CreationParams struct {
+	// Logger that the factory can use during creation and can pass to the created
+	// component to be used later as well.
+	Logger *zap.Logger
+}
+
 // FactoryV2 can create TraceReceiverV2 and MetricsReceiverV2. This is the
 // new factory type that can create new style receivers.
 type FactoryV2 interface {
@@ -84,10 +91,14 @@ type FactoryV2 interface {
 	// CreateTraceReceiverV2 creates a trace receiver based on this config.
 	// If the receiver type does not support tracing or if the config is not valid
 	// error will be returned instead.
-	CreateTraceReceiverV2(ctx context.Context, logger *zap.Logger, cfg configmodels.Receiver,
+	CreateTraceReceiverV2(ctx context.Context, params CreationParams, cfg configmodels.Receiver,
 		nextConsumer consumer.TraceConsumerV2) (TraceReceiver, error)
 
-	// TODO: add CreateMetricsReceiverV2.
+	// CreateMetricsReceiverV2 creates a metrics receiver based on this config.
+	// If the receiver type does not support metrics or if the config is not valid
+	// error will be returned instead.
+	CreateMetricsReceiverV2(ctx context.Context, params CreationParams, cfg configmodels.Receiver,
+		nextConsumer consumer.MetricsConsumerV2) (MetricsReceiver, error)
 }
 
 // Build takes a list of receiver factories and returns a map of type map[string]Factory

service/builder/receivers_builder.go

@@ -320,17 +320,18 @@ func createTraceReceiver(
 	nextConsumer consumer.BaseTraceConsumer,
 ) (receiver.TraceReceiver, error) {
 	if factoryV2, ok := factory.(receiver.FactoryV2); ok {
+		creationParams := receiver.CreationParams{Logger: logger}
 
 		// If both receiver and consumer are of the new type (can manipulate on internal data structure),
 		// use FactoryV2.CreateTraceReceiverV2.
 		if nextConsumerV2, ok := nextConsumer.(consumer.TraceConsumerV2); ok {
-			return factoryV2.CreateTraceReceiverV2(ctx, logger, cfg, nextConsumerV2)
+			return factoryV2.CreateTraceReceiverV2(ctx, creationParams, cfg, nextConsumerV2)
 		}
 
 		// If receiver is of the new type, but downstream consumer is of the old type,
 		// use internalToOCTraceConverter compatibility shim.
 		traceConverter := consumer.NewInternalToOCTraceConverter(nextConsumer.(consumer.TraceConsumer))
-		return factoryV2.CreateTraceReceiverV2(ctx, logger, cfg, traceConverter)
+		return factoryV2.CreateTraceReceiverV2(ctx, creationParams, cfg, traceConverter)
 	}
 
 	// If both receiver and consumer are of the old type (can manipulate on OC traces only),

service/builder/receivers_builder_test.go

@@ -400,7 +400,7 @@ func (b *newStyleReceiverFactory) CustomUnmarshaler() receiver.CustomUnmarshaler
 
 func (b *newStyleReceiverFactory) CreateTraceReceiverV2(
 	ctx context.Context,
-	logger *zap.Logger,
+	params receiver.CreationParams,
 	cfg configmodels.Receiver,
 	nextConsumer consumer.TraceConsumerV2,
 ) (receiver.TraceReceiver, error) {
@@ -408,7 +408,8 @@ func (b *newStyleReceiverFactory) CreateTraceReceiverV2(
 }
 
 func (b *newStyleReceiverFactory) CreateMetricsReceiverV2(
-	logger *zap.Logger,
+	ctx context.Context,
+	params receiver.CreationParams,
 	cfg configmodels.Receiver,
 	consumer consumer.MetricsConsumerV2,
 ) (receiver.MetricsReceiver, error) {