Add consumer profiles (open-telemetry#10464)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
This adds profiles support for consumers.


<!-- Issue number if applicable -->
#### Link to tracking issue
Based on the discussion in open-telemetry#10375.

---------

Co-authored-by: Pablo Baeyens <pbaeyens31+github@gmail.com>

.chloggen/profile-consumer.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: new_component
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: consumer/consumerprofiles
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Allow handling profiles in consumer.
+
+# One or more tracking issues or pull requests related to the change
+issues: [10464]
+
+# (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]

consumer/consumer.go

@@ -5,52 +5,22 @@ package consumer // import "go.opentelemetry.io/collector/consumer"
 
 import (
 	"errors"
+
+	"go.opentelemetry.io/collector/consumer/internal"
 )
 
 // Capabilities describes the capabilities of a Processor.
-type Capabilities struct {
-	// MutatesData is set to true if Consume* function of the
-	// processor modifies the input Traces, Logs or Metrics argument.
-	// Processors which modify the input data MUST set this flag to true. If the processor
-	// does not modify the data it MUST set this flag to false. If the processor creates
-	// a copy of the data before modifying then this flag can be safely set to false.
-	MutatesData bool
-}
-
-type baseConsumer interface {
-	Capabilities() Capabilities
-}
+type Capabilities = internal.Capabilities
 
 var errNilFunc = errors.New("nil consumer func")
 
-type baseImpl struct {
-	capabilities Capabilities
-}
-
 // Option to construct new consumers.
-type Option func(*baseImpl)
+type Option = internal.Option
 
 // WithCapabilities overrides the default GetCapabilities function for a processor.
 // The default GetCapabilities function returns mutable capabilities.
 func WithCapabilities(capabilities Capabilities) Option {
-	return func(o *baseImpl) {
-		o.capabilities = capabilities
-	}
-}
-
-// Capabilities returns the capabilities of the component
-func (bs baseImpl) Capabilities() Capabilities {
-	return bs.capabilities
-}
-
-func newBaseImpl(options ...Option) *baseImpl {
-	bs := &baseImpl{
-		capabilities: Capabilities{MutatesData: false},
+	return func(o *internal.BaseImpl) {
+		o.Cap = capabilities
 	}
-
-	for _, op := range options {
-		op(bs)
-	}
-
-	return bs
 }

consumer/consumerprofiles/Makefile

@@ -0,0 +1 @@
+include ../../Makefile.Common

consumer/consumerprofiles/go.mod

@@ -0,0 +1,35 @@
+module go.opentelemetry.io/collector/consumer/consumerprofiles
+
+go 1.21.0
+
+replace go.opentelemetry.io/collector/pdata => ../../pdata
+
+replace go.opentelemetry.io/collector/pdata/pprofile => ../../pdata/pprofile
+
+replace go.opentelemetry.io/collector/consumer => ../
+
+require (
+	github.com/stretchr/testify v1.9.0
+	go.opentelemetry.io/collector/consumer v0.104.0
+	go.opentelemetry.io/collector/pdata/pprofile v0.104.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.opentelemetry.io/collector/pdata v1.11.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
+	google.golang.org/grpc v1.65.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+replace go.opentelemetry.io/collector/pdata/testdata => ../../pdata/testdata

consumer/consumerprofiles/profiles.go

@@ -0,0 +1,47 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package consumerprofiles // import "go.opentelemetry.io/collector/consumer/consumerprofiles"
+
+import (
+	"context"
+	"errors"
+
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/consumer/internal"
+	"go.opentelemetry.io/collector/pdata/pprofile"
+)
+
+var errNilFunc = errors.New("nil consumer func")
+
+// Profiles is an interface that receives pprofile.Profiles, processes it
+// as needed, and sends it to the next processing node if any or to the destination.
+type Profiles interface {
+	internal.BaseConsumer
+	// ConsumeProfiles receives pprofile.Profiles for consumption.
+	ConsumeProfiles(ctx context.Context, td pprofile.Profiles) error
+}
+
+// ConsumeProfilesFunc is a helper function that is similar to ConsumeProfiles.
+type ConsumeProfilesFunc func(ctx context.Context, td pprofile.Profiles) error
+
+// ConsumeProfiles calls f(ctx, td).
+func (f ConsumeProfilesFunc) ConsumeProfiles(ctx context.Context, td pprofile.Profiles) error {
+	return f(ctx, td)
+}
+
+type baseProfiles struct {
+	*internal.BaseImpl
+	ConsumeProfilesFunc
+}
+
+// NewProfiles returns a Profiles configured with the provided options.
+func NewProfiles(consume ConsumeProfilesFunc, options ...consumer.Option) (Profiles, error) {
+	if consume == nil {
+		return nil, errNilFunc
+	}
+	return &baseProfiles{
+		BaseImpl:            internal.NewBaseImpl(options...),
+		ConsumeProfilesFunc: consume,
+	}, nil
+}

consumer/consumerprofiles/profiles_test.go

@@ -0,0 +1,51 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package consumerprofiles
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/pdata/pprofile"
+)
+
+func TestDefaultProfiles(t *testing.T) {
+	cp, err := NewProfiles(func(context.Context, pprofile.Profiles) error { return nil })
+	assert.NoError(t, err)
+	assert.NoError(t, cp.ConsumeProfiles(context.Background(), pprofile.NewProfiles()))
+	assert.Equal(t, consumer.Capabilities{MutatesData: false}, cp.Capabilities())
+}
+
+func TestNilFuncProfiles(t *testing.T) {
+	_, err := NewProfiles(nil)
+	assert.Equal(t, errNilFunc, err)
+}
+
+func TestWithCapabilitiesProfiles(t *testing.T) {
+	cp, err := NewProfiles(
+		func(context.Context, pprofile.Profiles) error { return nil },
+		consumer.WithCapabilities(consumer.Capabilities{MutatesData: true}))
+	assert.NoError(t, err)
+	assert.NoError(t, cp.ConsumeProfiles(context.Background(), pprofile.NewProfiles()))
+	assert.Equal(t, consumer.Capabilities{MutatesData: true}, cp.Capabilities())
+}
+
+func TestConsumeProfiles(t *testing.T) {
+	consumeCalled := false
+	cp, err := NewProfiles(func(context.Context, pprofile.Profiles) error { consumeCalled = true; return nil })
+	assert.NoError(t, err)
+	assert.NoError(t, cp.ConsumeProfiles(context.Background(), pprofile.NewProfiles()))
+	assert.True(t, consumeCalled)
+}
+
+func TestConsumeProfiles_ReturnError(t *testing.T) {
+	want := errors.New("my_error")
+	cp, err := NewProfiles(func(context.Context, pprofile.Profiles) error { return want })
+	assert.NoError(t, err)
+	assert.Equal(t, want, cp.ConsumeProfiles(context.Background(), pprofile.NewProfiles()))
+}

consumer/internal/consumer.go

@@ -0,0 +1,42 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package internal // import "go.opentelemetry.io/collector/consumer/internal"
+
+// Capabilities describes the capabilities of a Processor.
+type Capabilities struct {
+	// MutatesData is set to true if Consume* function of the
+	// processor modifies the input Traces, Logs or Metrics argument.
+	// Processors which modify the input data MUST set this flag to true. If the processor
+	// does not modify the data it MUST set this flag to false. If the processor creates
+	// a copy of the data before modifying then this flag can be safely set to false.
+	MutatesData bool
+}
+
+type BaseConsumer interface {
+	Capabilities() Capabilities
+}
+
+type BaseImpl struct {
+	Cap Capabilities
+}
+
+// Option to construct new consumers.
+type Option func(*BaseImpl)
+
+// Capabilities returns the capabilities of the component
+func (bs BaseImpl) Capabilities() Capabilities {
+	return bs.Cap
+}
+
+func NewBaseImpl(options ...Option) *BaseImpl {
+	bs := &BaseImpl{
+		Cap: Capabilities{MutatesData: false},
+	}
+
+	for _, op := range options {
+		op(bs)
+	}
+
+	return bs
+}

consumer/logs.go

@@ -6,13 +6,14 @@ package consumer // import "go.opentelemetry.io/collector/consumer"
 import (
 	"context"
 
+	"go.opentelemetry.io/collector/consumer/internal"
 	"go.opentelemetry.io/collector/pdata/plog"
 )
 
 // Logs is an interface that receives plog.Logs, processes it
 // as needed, and sends it to the next processing node if any or to the destination.
 type Logs interface {
-	baseConsumer
+	internal.BaseConsumer
 	// ConsumeLogs receives plog.Logs for consumption.
 	ConsumeLogs(ctx context.Context, ld plog.Logs) error
 }
@@ -26,7 +27,7 @@ func (f ConsumeLogsFunc) ConsumeLogs(ctx context.Context, ld plog.Logs) error {
 }
 
 type baseLogs struct {
-	*baseImpl
+	*internal.BaseImpl
 	ConsumeLogsFunc
 }
 
@@ -36,7 +37,7 @@ func NewLogs(consume ConsumeLogsFunc, options ...Option) (Logs, error) {
 		return nil, errNilFunc
 	}
 	return &baseLogs{
-		baseImpl:        newBaseImpl(options...),
+		BaseImpl:        internal.NewBaseImpl(options...),
 		ConsumeLogsFunc: consume,
 	}, nil
 }