feat: support for Cloud Run

Author: Yushu.Kozaki

constant.go

@@ -5,4 +5,6 @@ const (
 	EnvKeyGoogleCloudProject = "GOOGLE_CLOUD_PROJECT" // for Google App Engine
 	EnvKeyGAEServiceName     = "GAE_SERVICE"          // for Google App Engine
 	EnvKeyGAEServiceVersion  = "GAE_VERSION"          // for Google App Engine
+	EnvKeyRUNServiceName     = "K_SERVICE"            // for Google Cloud Run
+	EnvKeyRUNServiceRevision = "K_REVISION"           // for Google Cloud Run
 )

environ.go

@@ -11,6 +11,10 @@ var (
 	GAEServiceName = os.Getenv(EnvKeyGAEServiceName)
 	// GAEServiceVersion - Google App Engine service version
 	GAEServiceVersion = os.Getenv(EnvKeyGAEServiceVersion)
+	// RUNServiceName - Google Cloud Run service name
+	RUNServiceName = os.Getenv(EnvKeyRUNServiceName)
+	// RUNServiceRevision - Google Cloud Run service revision
+	RUNServiceRevision = os.Getenv(EnvKeyRUNServiceRevision)
 )
 
 func getProjectID() string {
@@ -32,4 +36,6 @@ func Reload() {
 	ProjectID = getProjectID()
 	GAEServiceName = os.Getenv(EnvKeyGAEServiceName)
 	GAEServiceVersion = os.Getenv(EnvKeyGAEServiceVersion)
+	RUNServiceName = os.Getenv(EnvKeyRUNServiceName)
+	RUNServiceRevision = os.Getenv(EnvKeyRUNServiceRevision)
 }