Add components YAML file with Core and Extended info (#8530)

* Add components YAML file with Core and Extended info

* Rename file

* Add test

* Format

* Update internal/pkg/otel/core_components_test.go

Co-authored-by: Paolo Chilà <paolo.chila@elastic.co>

* Simplify test

* Format

* Update internal/pkg/otel/core_components_test.go

Co-authored-by: Paolo Chilà <paolo.chila@elastic.co>

* Update internal/pkg/otel/core_components_test.go

Co-authored-by: Paolo Chilà <paolo.chila@elastic.co>

* Fix missing quotes

---------

Co-authored-by: Paolo Chilà <paolo.chila@elastic.co>

Author: theletterf

internal/pkg/otel/core-components.yaml

@@ -0,0 +1,43 @@
+# Components classification for the OpenTelemetry Collector
+components:
+
+#
+#  List of core components of the EDOT Collector
+#
+
+# Receivers
+  - filelogreceiver
+  - hostmetricsreceiver
+  - k8sclusterreceiver
+  - k8sobjectsreceiver
+  - kubeletstatsreceiver
+  - otlpreceiver
+
+# Exporters
+  - elasticsearchexporter
+  - otlpexporter
+  - otlphttpexporter
+
+# Processors
+  - attributesprocessor
+  - batchprocessor
+  - elasticinframetricsprocessor
+  - elastictraceprocessor
+  - k8sattributesprocessor
+  - resourcedetectionprocessor
+  - resourceprocessor
+  - transformprocessor
+
+# Connectors
+  - elasticapmconnector
+  - routingconnector
+
+# Extensions
+  - filestorage
+
+# Providers
+  - envprovider
+  - fileprovider
+  - httpprovider
+  - httpsprovider
+  - yamlprovider

internal/pkg/otel/core_components_test.go

@@ -0,0 +1,136 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License 2.0;
+// you may not use this file except in compliance with the Elastic License 2.0.
+
+package otel
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gopkg.in/yaml.v3"
+)
+
+// TestCoreComponentsInGoMod verifies that all components listed in core-components.yaml
+// are present in the project dependencies.
+func TestCoreComponentsInGoMod(t *testing.T) {
+	// Extract components from project dependencies
+	moduleComponents, err := extractComponentsFromDeps()
+	require.NoError(t, err, "Failed to extract components from dependencies")
+
+	// Print found components for debugging
+	t.Logf("Found components in dependencies: %v", moduleComponents)
+
+	// Load components from core-components.yaml
+	yamlComponents, err := loadCoreComponentsYAML()
+	require.NoError(t, err, "Failed to load core-components.yaml")
+
+	// Verify all components in YAML are present in dependencies
+	for _, component := range yamlComponents {
+		assert.Contains(t, moduleComponents, component)
+	}
+}
+
+// GoListModule represents the relevant parts of the `go list -json` output
+type GoListModule struct {
+	Deps []string `json:"Deps"`
+}
+
+// extractComponentsFromDeps extracts component names from the project dependencies
+// by running `go list -json` and parsing the output
+func extractComponentsFromDeps() ([]string, error) {
+	// Run go list -json to get the dependencies
+	cmd := exec.Command("go", "list", "-json", "github.com/elastic/elastic-agent")
+	output, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("failed to run go list command: %w", err)
+	}
+
+	// Parse the JSON output
+	var module GoListModule
+	if err := json.Unmarshal(output, &module); err != nil {
+		return nil, fmt.Errorf("failed to parse go list output: %w", err)
+	}
+
+	// Component types to look for in dependency paths
+	componentTypes := []string{
+		"processor",
+		"receiver",
+		"extension",
+		"exporter",
+		"connector",
+		"confmap/provider",
+		"storage",
+	}
+
+	// Extract component names from dependency paths
+	var components []string
+	for _, dep := range module.Deps {
+		for _, cType := range componentTypes {
+			// Check if the dependency path contains the component type
+			if strings.Contains(dep, "/"+cType+"/") {
+				// Extract the component name (last part of the path)
+				parts := strings.Split(dep, "/")
+				if len(parts) > 0 {
+					componentName := parts[len(parts)-1]
+					components = append(components, componentName)
+				}
+			}
+		}
+
+		// Special case for filestorage which is under extension/storage/
+		if strings.Contains(dep, "/extension/storage/") {
+			parts := strings.Split(dep, "/")
+			if len(parts) > 0 {
+				componentName := parts[len(parts)-1]
+				components = append(components, componentName)
+			}
+		}
+	}
+
+	return components, nil
+}
+
+// loadCoreComponentsYAML loads the components from core-components.yaml
+func loadCoreComponentsYAML() ([]string, error) {
+	// Get the directory of the current file
+	_, filename, _, ok := runtime.Caller(0)
+	if !ok {
+		return nil, fmt.Errorf("failed to get current file path")
+	}
+	dir := filepath.Dir(filename)
+	yamlPath := filepath.Join(dir, "core-components.yaml")
+
+	yamlFile, err := os.ReadFile(yamlPath)
+	if err != nil {
+		return nil, err
+	}
+
+	var data struct {
+		Components []string `yaml:"components"`
+	}
+
+	err = yaml.Unmarshal(yamlFile, &data)
+	if err != nil {
+		return nil, err
+	}
+
+	// Filter out any empty strings or comments
+	var filteredComponents []string
+	for _, comp := range data.Components {
+		comp = strings.TrimSpace(comp)
+		if comp != "" && !strings.HasPrefix(comp, "#") {
+			filteredComponents = append(filteredComponents, comp)
+		}
+	}
+
+	return filteredComponents, nil
+}