Add --opencost flag to setup standard OpenCost configuration (#173)

README.md

@@ -261,13 +261,13 @@ Kubecost/OpenCost APIs:
     --service-name string             The name of the Kubecost cost analyzer service. By default, it is derived from the Helm release name and should not need to be overridden.
     --service-port int                The port of the service at which the APIs are running. If using OpenCost, you may want to set this to 9003. (default 9090)
     -N, --kubecost-namespace string   The namespace that Kubecost is deployed in. Requests to the API will be directed to this namespace. Defaults to the Helm release name.
-
     --use-proxy                       Instead of temporarily port-forwarding, proxy a request to Kubecost through the Kubernetes API server.
 
     --allocation-path string          URL path at which Allocation queries can be served from the configured service. If using OpenCost, you may want to set this to '/allocation/compute' (default "/model/allocation")
 
     --predict-speccost-path string    URL path at which Prediction queries can be served from the configured service. (default "/model/prediction/speccost")
     --no-usage                        Set true ignore historical usage data (if any exists) when performing cost prediction.
+    --opencost                        Set true to configure Kubecost parameters according to the OpenCost default specification. It is equivalent to providing the options '--service-port 9003 --service-name opencost --kubecost-namespace opencost --allocation-path /allocation/compute'
     --only-after                      Set true to only show the overall predicted cost of the workload.
     --only-diff                       Set true to only show the cost difference (cost "impact") instead of the overall cost plus diff. (default true)
 ```

pkg/query/options.go

@@ -14,6 +14,14 @@ import (
 	"github.com/spf13/viper"
 )
 
+// OpenCost specification parameter values
+const (
+	OpenCostServiceName      = "opencost"
+	OpenCostServiceNamespace = "opencost"
+	OpenCostServicePort      = 9003
+	OpenCostAllocationPath   = "/allocation/compute"
+)
+
 // QueryBackendOptions holds common options for managing the query backend used
 // by kubectl-cost, like service name, namespace, etc.
 type QueryBackendOptions struct {
@@ -45,11 +53,20 @@ type QueryBackendOptions struct {
 	// e.g. "/prediction/speccost"
 	PredictSpecCostPath string
 
+	// A boolean value  to automatically set parameters according to OpenCost specification.
+	OpenCost bool
+
 	restConfig *rest.Config
 	pfQuerier  *PortForwardQuerier
 }
 
 func (o *QueryBackendOptions) Complete(restConfig *rest.Config) error {
+	if o.OpenCost {
+		o.ServiceName = OpenCostServiceName
+		o.KubecostNamespace = OpenCostServiceNamespace
+		o.ServicePort = OpenCostServicePort
+		o.AllocationPath = OpenCostAllocationPath
+	}
 	if o.ServiceName == "" {
 		o.ServiceName = fmt.Sprintf("%s-cost-analyzer", o.HelmReleaseName)
 		log.Debugf("ServiceName set to: %s", o.ServiceName)
@@ -92,6 +109,7 @@ func AddQueryBackendOptionsFlags(cmd *cobra.Command, options *QueryBackendOption
 	cmd.Flags().BoolVar(&options.UseProxy, "use-proxy", false, "Instead of temporarily port-forwarding, proxy a request to Kubecost through the Kubernetes API server.")
 	cmd.Flags().StringVar(&options.AllocationPath, "allocation-path", "/model/allocation", "URL path at which Allocation queries can be served from the configured service. If using OpenCost, you may want to set this to '/allocation/compute'")
 	cmd.Flags().StringVar(&options.PredictSpecCostPath, "predict-speccost-path", "/model/prediction/speccost", "URL path at which Prediction queries can be served from the configured service.")
+	cmd.Flags().BoolVar(&options.OpenCost, "opencost", false, " Set true to configure Kubecost parameters according to the OpenCost default specification. It is equivalent to providing the options '--service-port 9003 --service-name opencost --kubecost-namespace opencost --allocation-path /allocation/compute'.")
 
 	//Check if environment variable KUBECTL_COST_USE_PROXY is set, it defaults to false
 	v := viper.New()