[extension/encoding/awscloudwatchmetricstreams_encoding] Support unmarshalling JSON-formatted CloudWatch Metric Streams

.chloggen/add-json-cw-metric-stream.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# 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. filelogreceiver)
+component: awscloudwatchmetricstreamsencodingextension
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add unmarshaler for JSON cloudwatch metric stream
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [38407]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# 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: [user]

extension/encoding/awscloudwatchmetricstreamsencodingextension/extension.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 
 	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/extension"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding"
@@ -19,12 +20,15 @@ type encodingExtension struct {
 	pmetric.Unmarshaler
 }
 
-func newExtension(cfg *Config) (*encodingExtension, error) {
+func newExtension(cfg *Config, settings extension.Settings) (*encodingExtension, error) {
 	switch cfg.Format {
 	case formatJSON:
-		return &encodingExtension{Unmarshaler: formatJSONUnmarshaler{}}, nil
+		return &encodingExtension{&formatJSONUnmarshaler{
+			buildInfo: settings.BuildInfo,
+			logger:    settings.Logger,
+		}}, nil
 	case formatOpenTelemetry10:
-		return &encodingExtension{Unmarshaler: formatOpenTelemetry10Unmarshaler{}}, nil
+		return &encodingExtension{Unmarshaler: &formatOpenTelemetry10Unmarshaler{}}, nil
 	default:
 		// Format will have been validated by Config.Validate,
 		// so we'll only get here if we haven't handled a valid
@@ -40,17 +44,3 @@ func (*encodingExtension) Start(_ context.Context, _ component.Host) error {
 func (*encodingExtension) Shutdown(_ context.Context) error {
 	return nil
 }
-
-type formatJSONUnmarshaler struct{}
-
-func (formatJSONUnmarshaler) UnmarshalMetrics([]byte) (pmetric.Metrics, error) {
-	// TODO implement
-	return pmetric.Metrics{}, fmt.Errorf("UnmarshalMetrics unimplemented for format %q", formatJSON)
-}
-
-type formatOpenTelemetry10Unmarshaler struct{}
-
-func (formatOpenTelemetry10Unmarshaler) UnmarshalMetrics([]byte) (pmetric.Metrics, error) {
-	// TODO implement
-	return pmetric.Metrics{}, fmt.Errorf("UnmarshalMetrics unimplemented for format %q", formatOpenTelemetry10)
-}

extension/encoding/awscloudwatchmetricstreamsencodingextension/extension_test.go

@@ -8,19 +8,20 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/extension/extensiontest"
 )
 
 func TestNew_JSON(t *testing.T) {
-	e, err := newExtension(&Config{Format: formatJSON})
+	e, err := newExtension(&Config{Format: formatJSON}, extensiontest.NewNopSettings(extensiontest.NopType))
 	require.NoError(t, err)
 	require.NotNil(t, e)
 
 	_, err = e.UnmarshalMetrics([]byte{})
-	assert.EqualError(t, err, `UnmarshalMetrics unimplemented for format "json"`)
+	assert.EqualError(t, err, errEmptyRecord.Error())
 }
 
 func TestNew_OpenTelemetry10(t *testing.T) {
-	e, err := newExtension(&Config{Format: formatOpenTelemetry10})
+	e, err := newExtension(&Config{Format: formatOpenTelemetry10}, extensiontest.NewNopSettings(extensiontest.NopType))
 	require.NoError(t, err)
 	require.NotNil(t, e)
 
@@ -29,7 +30,7 @@ func TestNew_OpenTelemetry10(t *testing.T) {
 }
 
 func TestNew_Unimplemented(t *testing.T) {
-	e, err := newExtension(&Config{Format: "invalid"})
+	e, err := newExtension(&Config{Format: "invalid"}, extensiontest.NewNopSettings(extensiontest.NopType))
 	require.Error(t, err)
 	require.Nil(t, e)
 	assert.EqualError(t, err, `unimplemented format "invalid"`)

extension/encoding/awscloudwatchmetricstreamsencodingextension/factory.go

@@ -21,8 +21,8 @@ func NewFactory() extension.Factory {
 	)
 }
 
-func createExtension(_ context.Context, _ extension.Settings, cfg component.Config) (extension.Extension, error) {
-	return newExtension(cfg.(*Config))
+func createExtension(_ context.Context, settings extension.Settings, cfg component.Config) (extension.Extension, error) {
+	return newExtension(cfg.(*Config), settings)
 }
 
 func createDefaultConfig() component.Config {

extension/encoding/awscloudwatchmetricstreamsencodingextension/go.mod

@@ -3,7 +3,10 @@ module github.com/open-telemetry/opentelemetry-collector-contrib/extension/encod
 go 1.23.0
 
 require (
+	github.com/json-iterator/go v1.1.12
 	github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding v0.121.0
+	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/golden v0.121.0
+	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest v0.121.0
 	github.com/stretchr/testify v1.10.0
 	go.opentelemetry.io/collector/component v1.27.0
 	go.opentelemetry.io/collector/component/componenttest v0.121.0
@@ -12,24 +15,27 @@ require (
 	go.opentelemetry.io/collector/extension v1.27.0
 	go.opentelemetry.io/collector/extension/extensiontest v0.121.0
 	go.opentelemetry.io/collector/pdata v1.27.0
+	go.opentelemetry.io/collector/semconv v0.121.0
 	go.uber.org/goleak v1.3.0
+	go.uber.org/zap v1.27.0
 )
 
 require (
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/knadh/koanf/maps v0.1.1 // indirect
 	github.com/knadh/koanf/providers/confmap v0.1.0 // indirect
 	github.com/knadh/koanf/v2 v2.1.2 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil v0.121.0 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/collector/pdata/pprofile v0.121.0 // indirect
@@ -39,10 +45,9 @@ require (
 	go.opentelemetry.io/otel/sdk/metric v1.34.0 // indirect
 	go.opentelemetry.io/otel/trace v1.34.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	go.uber.org/zap v1.27.0 // indirect
-	golang.org/x/net v0.33.0 // indirect
-	golang.org/x/sys v0.29.0 // indirect
-	golang.org/x/text v0.21.0 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20241202173237-19429a94021a // indirect
 	google.golang.org/grpc v1.70.0 // indirect
 	google.golang.org/protobuf v1.36.5 // indirect