[chore] [exporter/datadogexporter] Use opentelemetry-mapping-go paylo…

…ad definitions for host metadata and gohai (open-telemetry#24267)

**Description:** 

Host metadata and gohai payloads were moved to a new `pkg/inframetadata`
Go module. This PR is just an internal refactor using the new payloads.

cmd/configschema/go.mod

@@ -248,6 +248,7 @@ require (
 	github.com/DataDog/datadog-go/v5 v5.1.1 // indirect
 	github.com/DataDog/go-tuf v0.3.0--fix-localmeta-fork // indirect
 	github.com/DataDog/gohai v0.0.0-20220718130825-1776f9beb9cc // indirect
+	github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata v0.5.1 // indirect
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/logs v0.5.1 // indirect
 	github.com/DataDog/opentelemetry-mapping-go/pkg/quantile v0.5.1 // indirect
 	github.com/DataDog/sketches-go v1.4.2 // indirect

cmd/otelcontribcol/go.mod

@@ -264,6 +264,7 @@ require (
 	github.com/DataDog/datadog-go/v5 v5.1.1 // indirect
 	github.com/DataDog/go-tuf v0.3.0--fix-localmeta-fork // indirect
 	github.com/DataDog/gohai v0.0.0-20220718130825-1776f9beb9cc // indirect
+	github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata v0.5.1 // indirect
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/attributes v0.5.1 // indirect
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/logs v0.5.1 // indirect
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/metrics v0.5.1 // indirect

exporter/datadogexporter/factory_test.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata/payload"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/component"
@@ -19,7 +20,6 @@ import (
 	"go.opentelemetry.io/collector/exporter/exportertest"
 	"go.opentelemetry.io/collector/pdata/ptrace"
 
-	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/hostmetadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/metadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/testutil"
 )
@@ -617,7 +617,7 @@ func TestOnlyMetadata(t *testing.T) {
 	require.NoError(t, err)
 
 	body := <-server.MetadataChan
-	var recvMetadata hostmetadata.HostMetadata
+	var recvMetadata payload.HostMetadata
 	err = json.Unmarshal(body, &recvMetadata)
 	require.NoError(t, err)
 	assert.Equal(t, recvMetadata.InternalHostname, "custom-hostname")

exporter/datadogexporter/go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/DataDog/datadog-agent/pkg/trace v0.47.0-rc.2
 	github.com/DataDog/datadog-api-client-go/v2 v2.14.0
 	github.com/DataDog/gohai v0.0.0-20220718130825-1776f9beb9cc
+	github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata v0.5.1
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/attributes v0.5.1
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/logs v0.5.1
 	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/metrics v0.5.1

exporter/datadogexporter/internal/hostmetadata/internal/gohai/gohai.go

@@ -9,22 +9,21 @@ import (
 	"github.com/DataDog/gohai/memory"
 	"github.com/DataDog/gohai/network"
 	"github.com/DataDog/gohai/platform"
+	"github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata/gohai"
 	"go.uber.org/zap"
 )
 
 // NewPayload builds a payload of every metadata collected with gohai except processes metadata.
 // Parts of this are based on datadog-agent code
 // https://github.com/DataDog/datadog-agent/blob/94a28d9cee3f1c886b3866e8208be5b2a8c2c217/pkg/metadata/internal/gohai/gohai.go#L27-L32
-func NewPayload(logger *zap.Logger) Payload {
-	return Payload{
-		Gohai: gohaiMarshaler{
-			gohai: newGohai(logger),
-		},
-	}
+func NewPayload(logger *zap.Logger) gohai.Payload {
+	payload := gohai.NewEmpty()
+	payload.Gohai.Gohai = newGohai(logger)
+	return payload
 }
 
-func newGohai(logger *zap.Logger) *gohai {
-	res := new(gohai)
+func newGohai(logger *zap.Logger) *gohai.Gohai {
+	res := new(gohai.Gohai)
 
 	if p, err := new(cpu.Cpu).Collect(); err != nil {
 		logger.Info("Failed to retrieve cpu metadata", zap.Error(err))

exporter/datadogexporter/internal/hostmetadata/internal/gohai/gohai_test.go

@@ -18,9 +18,9 @@ import (
 func TestGetPayload(t *testing.T) {
 	logger := zap.NewNop()
 	gohai := NewPayload(logger)
-	assert.NotNil(t, gohai.Gohai.gohai.CPU)
-	assert.NotNil(t, gohai.Gohai.gohai.FileSystem)
-	assert.NotNil(t, gohai.Gohai.gohai.Memory)
-	assert.NotNil(t, gohai.Gohai.gohai.Network)
-	assert.NotNil(t, gohai.Gohai.gohai.Platform)
+	assert.NotNil(t, gohai.Gohai.Gohai.CPU)
+	assert.NotNil(t, gohai.Gohai.Gohai.FileSystem)
+	assert.NotNil(t, gohai.Gohai.Gohai.Memory)
+	assert.NotNil(t, gohai.Gohai.Gohai.Network)
+	assert.NotNil(t, gohai.Gohai.Gohai.Platform)
 }

exporter/datadogexporter/internal/hostmetadata/internal/gohai/processes.go

@@ -7,11 +7,12 @@ package gohai // import "github.com/open-telemetry/opentelemetry-collector-contr
 
 import (
 	"github.com/DataDog/gohai/processes"
+	"github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata/gohai"
 	"go.uber.org/zap"
 )
 
 // NewProcessesPayload builds a payload of processes metadata collected from gohai.
-func NewProcessesPayload(hostname string, logger *zap.Logger) *ProcessesPayload {
+func NewProcessesPayload(hostname string, logger *zap.Logger) *gohai.ProcessesPayload {
 	// Get processes metadata from gohai
 	proc, err := new(processes.Processes).Collect()
 	if err != nil {
@@ -22,7 +23,7 @@ func NewProcessesPayload(hostname string, logger *zap.Logger) *ProcessesPayload
 	processesPayload := map[string]interface{}{
 		"snaps": []interface{}{proc},
 	}
-	return &ProcessesPayload{
+	return &gohai.ProcessesPayload{
 		Processes: processesPayload,
 		Meta: map[string]string{
 			"host": hostname,

exporter/datadogexporter/internal/hostmetadata/internal/gohai/processes_other.go

@@ -5,10 +5,13 @@
 
 package gohai // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/hostmetadata/internal/gohai"
 
-import "go.uber.org/zap"
+import (
+	"github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata/gohai"
+	"go.uber.org/zap"
+)
 
 // GetProcessesPayload currently just a stub.
-func NewProcessesPayload(_ string, _ *zap.Logger) *ProcessesPayload {
+func NewProcessesPayload(_ string, _ *zap.Logger) *gohai.ProcessesPayload {
 	// unimplemented for misc platforms.
-	return &ProcessesPayload{}
+	return &gohai.ProcessesPayload{}
 }

exporter/datadogexporter/internal/hostmetadata/metadata.go

@@ -13,6 +13,7 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/DataDog/opentelemetry-mapping-go/pkg/inframetadata/payload"
 	"github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/attributes"
 	ec2Attributes "github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/attributes/ec2"
 	"github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/attributes/gcp"
@@ -29,72 +30,10 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/scrub"
 )
 
-// HostMetadata includes metadata about the host tags,
-// host aliases and identifies the host as an OpenTelemetry host
-type HostMetadata struct {
-	// Meta includes metadata about the host.
-	Meta *Meta `json:"meta"`
-
-	// InternalHostname is the canonical hostname
-	InternalHostname string `json:"internalHostname"`
-
-	// Version is the OpenTelemetry Collector version.
-	// This is used for correctly identifying the Collector in the backend,
-	// and for telemetry purposes.
-	Version string `json:"otel_version"`
-
-	// Flavor is always set to "opentelemetry-collector".
-	// It is used for telemetry purposes in the backend.
-	Flavor string `json:"agent-flavor"`
-
-	// Tags includes the host tags
-	Tags *HostTags `json:"host-tags"`
-
-	// Payload contains inventory of system information provided by gohai
-	// this is embedded because of special serialization requirements
-	// the field `gohai` is JSON-formatted string
-	gohai.Payload
-
-	// Processes contains the process payload devired by gohai
-	// Because of legacy reasons this is called resources in datadog intake
-	Processes *gohai.ProcessesPayload `json:"resources"`
-}
-
-// HostTags are the host tags.
-// Currently only system (configuration) tags are considered.
-type HostTags struct {
-	// OTel are host tags set in the configuration
-	OTel []string `json:"otel,omitempty"`
-
-	// GCP are Google Cloud Platform tags
-	GCP []string `json:"google cloud platform,omitempty"`
-}
-
-// Meta includes metadata about the host aliases
-type Meta struct {
-	// InstanceID is the EC2 instance id the Collector is running on, if available
-	InstanceID string `json:"instance-id,omitempty"`
-
-	// EC2Hostname is the hostname from the EC2 metadata API
-	EC2Hostname string `json:"ec2-hostname,omitempty"`
-
-	// Hostname is the canonical hostname
-	Hostname string `json:"hostname"`
-
-	// SocketHostname is the OS hostname
-	SocketHostname string `json:"socket-hostname,omitempty"`
-
-	// SocketFqdn is the FQDN hostname
-	SocketFqdn string `json:"socket-fqdn,omitempty"`
-
-	// HostAliases are other available host names
-	HostAliases []string `json:"host_aliases,omitempty"`
-}
-
 // metadataFromAttributes gets metadata info from attributes following
 // OpenTelemetry semantic conventions
-func metadataFromAttributes(attrs pcommon.Map) *HostMetadata {
-	hm := &HostMetadata{Meta: &Meta{}, Tags: &HostTags{}}
+func metadataFromAttributes(attrs pcommon.Map) *payload.HostMetadata {
+	hm := &payload.HostMetadata{Meta: &payload.Meta{}, Tags: &payload.HostTags{}}
 
 	if src, ok := attributes.SourceFromAttrs(attrs); ok && src.Kind == source.HostnameKind {
 		hm.InternalHostname = src.Identifier
@@ -118,7 +57,7 @@ func metadataFromAttributes(attrs pcommon.Map) *HostMetadata {
 	return hm
 }
 
-func fillHostMetadata(params exporter.CreateSettings, pcfg PusherConfig, p source.Provider, hm *HostMetadata) {
+func fillHostMetadata(params exporter.CreateSettings, pcfg PusherConfig, p source.Provider, hm *payload.HostMetadata) {
 	// Could not get hostname from attributes
 	if hm.InternalHostname == "" {
 		if src, err := p.Source(context.TODO()); err == nil && src.Kind == source.HostnameKind {
@@ -149,7 +88,7 @@ func fillHostMetadata(params exporter.CreateSettings, pcfg PusherConfig, p sourc
 	}
 }
 
-func pushMetadata(pcfg PusherConfig, params exporter.CreateSettings, metadata *HostMetadata) error {
+func pushMetadata(pcfg PusherConfig, params exporter.CreateSettings, metadata *payload.HostMetadata) error {
 	if metadata.Meta.Hostname == "" {
 		// if the hostname is empty, don't send metadata; we don't need it.
 		params.Logger.Debug("Skipping host metadata since the hostname is empty")
@@ -181,7 +120,7 @@ func pushMetadata(pcfg PusherConfig, params exporter.CreateSettings, metadata *H
 	return nil
 }
 
-func pushMetadataWithRetry(retrier *clientutil.Retrier, params exporter.CreateSettings, pcfg PusherConfig, hostMetadata *HostMetadata) {
+func pushMetadataWithRetry(retrier *clientutil.Retrier, params exporter.CreateSettings, pcfg PusherConfig, hostMetadata *payload.HostMetadata) {
 	params.Logger.Debug("Sending host metadata payload", zap.Any("payload", hostMetadata))
 
 	_, err := retrier.DoWithRetries(context.Background(), func(context.Context) error {
@@ -211,7 +150,7 @@ func Pusher(ctx context.Context, params exporter.CreateSettings, pcfg PusherConf
 	// All fields that are being filled in by our exporter
 	// do not change over time. If this ever changes `hostMetadata`
 	// *must* be deep copied before calling `fillHostMetadata`.
-	hostMetadata := &HostMetadata{Meta: &Meta{}, Tags: &HostTags{}}
+	hostMetadata := &payload.HostMetadata{Meta: &payload.Meta{}, Tags: &payload.HostTags{}}
 	if pcfg.UseResourceMetadata {
 		hostMetadata = metadataFromAttributes(attrs)
 	}