feat: add GetProjectNumber function #3

Author: 54m

environ.go

@@ -1,7 +1,10 @@
 package gcpen
 
 import (
+	"context"
 	"os"
+
+	"google.golang.org/api/cloudresourcemanager/v1"
 )
 
 var (
@@ -11,6 +14,7 @@ var (
 	ServiceName = os.Getenv(EnvKeyServiceName)
 	// ServiceVersion - Google App Engine service version
 	ServiceVersion = os.Getenv(EnvKeyServiceVersion)
+	projectNumber  int64
 )
 
 func getProjectID() string {
@@ -33,3 +37,24 @@ func Reload() {
 	ServiceName = os.Getenv(EnvKeyServiceName)
 	ServiceVersion = os.Getenv(EnvKeyServiceVersion)
 }
+
+// GetProjectNumber - get project number
+func GetProjectNumber(ctx context.Context, forceRefresh ...bool) (int64, error) {
+	if projectNumber != 0 && !(len(forceRefresh) > 0 && forceRefresh[0]) {
+		return projectNumber, nil
+	}
+
+	service, err := cloudresourcemanager.NewService(ctx)
+	if err != nil {
+		return 0, err
+	}
+
+	project, err := service.Projects.Get(getProjectID()).Context(ctx).Do()
+	if err != nil {
+		return 0, err
+	}
+
+	projectNumber = project.ProjectNumber
+
+	return projectNumber, nil
+}