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fix(logging): correctly detect GKE resource (#4092)
* fix(logging): gke resource autodetection

* fix: detect gke resource correctly

* chore: remove podname and  namespace labels not supported

* feat: detect podname from HOSTNAME envvar

* feat: add resource.namespace_name

* feat: add container name to resource.labels
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0xSage committed May 19, 2021
1 parent 1246717 commit a2538e16123c21da62036b56df8c104360f1c2d6
Showing with 268 additions and 202 deletions.
  1. +0 −202 logging/logging.go
  2. +268 −0 logging/resource.go
@@ -32,15 +32,13 @@ import (
"fmt"
"log"
"net/http"
"os"
"regexp"
"strconv"
"strings"
"sync"
"time"
"unicode/utf8"

"cloud.google.com/go/compute/metadata"
"cloud.google.com/go/internal/version"
vkit "cloud.google.com/go/logging/apiv2"
"cloud.google.com/go/logging/internal"
@@ -242,206 +240,6 @@ type LoggerOption interface {
set(*Logger)
}

// CommonResource sets the monitored resource associated with all log entries
// written from a Logger. If not provided, the resource is automatically
// detected based on the running environment (on GCE, GCR, GCF and GAE Standard only).
// This value can be overridden per-entry by setting an Entry's Resource field.
func CommonResource(r *mrpb.MonitoredResource) LoggerOption { return commonResource{r} }

type commonResource struct{ *mrpb.MonitoredResource }

func (r commonResource) set(l *Logger) { l.commonResource = r.MonitoredResource }

var detectedResource struct {
pb *mrpb.MonitoredResource
once sync.Once
}

func detectGCEResource() *mrpb.MonitoredResource {
projectID, err := metadata.ProjectID()
if err != nil {
return nil
}
id, err := metadata.InstanceID()
if err != nil {
return nil
}
zone, err := metadata.Zone()
if err != nil {
return nil
}
name, err := metadata.InstanceName()
if err != nil {
return nil
}
return &mrpb.MonitoredResource{
Type: "gce_instance",
Labels: map[string]string{
"project_id": projectID,
"instance_id": id,
"instance_name": name,
"zone": zone,
},
}
}

func isCloudRun() bool {
_, config := os.LookupEnv("K_CONFIGURATION")
_, service := os.LookupEnv("K_SERVICE")
_, revision := os.LookupEnv("K_REVISION")
return config && service && revision
}

func detectCloudRunResource() *mrpb.MonitoredResource {
projectID, err := metadata.ProjectID()
if err != nil {
return nil
}
zone, err := metadata.Zone()
if err != nil {
return nil
}
return &mrpb.MonitoredResource{
Type: "cloud_run_revision",
Labels: map[string]string{
"project_id": projectID,
"location": regionFromZone(zone),
"service_name": os.Getenv("K_SERVICE"),
"revision_name": os.Getenv("K_REVISION"),
"configuration_name": os.Getenv("K_CONFIGURATION"),
},
}
}

func isCloudFunction() bool {
// Reserved envvars in older function runtimes, e.g. Node.js 8, Python 3.7 and Go 1.11.
_, name := os.LookupEnv("FUNCTION_NAME")
_, region := os.LookupEnv("FUNCTION_REGION")
_, entry := os.LookupEnv("ENTRY_POINT")

// Reserved envvars in newer function runtimes.
_, target := os.LookupEnv("FUNCTION_TARGET")
_, signature := os.LookupEnv("FUNCTION_SIGNATURE_TYPE")
_, service := os.LookupEnv("K_SERVICE")
return (name && region && entry) || (target && signature && service)
}

func detectCloudFunction() *mrpb.MonitoredResource {
projectID, err := metadata.ProjectID()
if err != nil {
return nil
}
zone, err := metadata.Zone()
if err != nil {
return nil
}
// Newer functions runtimes store name in K_SERVICE.
functionName, exists := os.LookupEnv("K_SERVICE")
if !exists {
functionName, _ = os.LookupEnv("FUNCTION_NAME")
}
return &mrpb.MonitoredResource{
Type: "cloud_function",
Labels: map[string]string{
"project_id": projectID,
"region": regionFromZone(zone),
"function_name": functionName,
},
}
}

// isAppEngine returns true for both standard and flex
func isAppEngine() bool {
_, service := os.LookupEnv("GAE_SERVICE")
_, version := os.LookupEnv("GAE_VERSION")
_, instance := os.LookupEnv("GAE_INSTANCE")

return service && version && instance
}

func detectAppEngineResource() *mrpb.MonitoredResource {
projectID, err := metadata.ProjectID()
if err != nil {
return nil
}
if projectID == "" {
projectID = os.Getenv("GOOGLE_CLOUD_PROJECT")
}
zone, err := metadata.Zone()
if err != nil {
return nil
}

return &mrpb.MonitoredResource{
Type: "gae_app",
Labels: map[string]string{
"project_id": projectID,
"module_id": os.Getenv("GAE_SERVICE"),
"version_id": os.Getenv("GAE_VERSION"),
"instance_id": os.Getenv("GAE_INSTANCE"),
"runtime": os.Getenv("GAE_RUNTIME"),
"zone": zone,
},
}
}

func detectResource() *mrpb.MonitoredResource {
detectedResource.once.Do(func() {
switch {
// AppEngine, Functions, CloudRun are detected first, as metadata.OnGCE()
// erroneously returns true on these runtimes.
case isAppEngine():
detectedResource.pb = detectAppEngineResource()
case isCloudFunction():
detectedResource.pb = detectCloudFunction()
case isCloudRun():
detectedResource.pb = detectCloudRunResource()
case metadata.OnGCE():
detectedResource.pb = detectGCEResource()
}
})
return detectedResource.pb
}

var resourceInfo = map[string]struct{ rtype, label string }{
"organizations": {"organization", "organization_id"},
"folders": {"folder", "folder_id"},
"projects": {"project", "project_id"},
"billingAccounts": {"billing_account", "account_id"},
}

func monitoredResource(parent string) *mrpb.MonitoredResource {
parts := strings.SplitN(parent, "/", 2)
if len(parts) != 2 {
return globalResource(parent)
}
info, ok := resourceInfo[parts[0]]
if !ok {
return globalResource(parts[1])
}
return &mrpb.MonitoredResource{
Type: info.rtype,
Labels: map[string]string{info.label: parts[1]},
}
}

func regionFromZone(zone string) string {
cutoff := strings.LastIndex(zone, "-")
if cutoff > 0 {
return zone[:cutoff]
}
return zone
}

func globalResource(projectID string) *mrpb.MonitoredResource {
return &mrpb.MonitoredResource{
Type: "global",
Labels: map[string]string{
"project_id": projectID,
},
}
}

// CommonLabels are labels that apply to all log entries written from a Logger,
// so that you don't have to repeat them in each log entry's Labels field. If
// any of the log entries contains a (key, value) with the same key that is in

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