github/kubernetes
1
0
Fork 0
mirror of https://github.com/k3s-io/kubernetes.git synced 2025-07-30 15:05:27 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #39428 from shiywang/refactor_wideColumns_printer

Browse Source 
Automatic merge from submit-queue (batch tested with PRs 39132, 39428)

Move wideHeader [] strings into handlerEntry

To adress this problem: https://github.com/openshift/origin/pull/12354, make `-o wide` more flexible to be used by OpenShift
This commit is contained in:
Kubernetes Submit Queue 2017-01-06 09:53:20 -08:00 committed by GitHub
commit 0d93a4c360
2 changed files with 127 additions and 149 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

202
pkg/kubectl/resource_printer.go
View File

@ -352,6 +352,7 @@ func (p *YAMLPrinter) HandledResources() []string {
type handlerEntry struct { type handlerEntry struct {
columns []string columns []string
columnsWithWide []string
printFunc reflect.Value printFunc reflect.Value
args []reflect.Value args []reflect.Value
} }
@ -414,7 +415,7 @@ func (h *HumanReadablePrinter) EnsurePrintWithKind(kind string) {
// Handler adds a print handler with a given set of columns to HumanReadablePrinter instance. // Handler adds a print handler with a given set of columns to HumanReadablePrinter instance.
// See validatePrintHandlerFunc for required method signature. // See validatePrintHandlerFunc for required method signature.
func (h *HumanReadablePrinter) Handler(columns []string, printFunc interface{}) error { func (h *HumanReadablePrinter) Handler(columns, columnsWithWide []string, printFunc interface{}) error {
printFuncValue := reflect.ValueOf(printFunc) printFuncValue := reflect.ValueOf(printFunc)
if err := h.validatePrintHandlerFunc(printFuncValue); err != nil { if err := h.validatePrintHandlerFunc(printFuncValue); err != nil {
glog.Errorf("Unable to add print handler: %v", err) glog.Errorf("Unable to add print handler: %v", err)
@ -424,6 +425,7 @@ func (h *HumanReadablePrinter) Handler(columns []string, printFunc interface{})
objType := printFuncValue.Type().In(0) objType := printFuncValue.Type().In(0)
h.handlerMap[objType] = &handlerEntry{ h.handlerMap[objType] = &handlerEntry{
columns: columns, columns: columns,
columnsWithWide: columnsWithWide,
printFunc: printFuncValue, printFunc: printFuncValue,
} }
return nil return nil
@ -476,18 +478,25 @@ func (h *HumanReadablePrinter) AfterPrint(output io.Writer, res string) error {
// pkg/kubectl/cmd/get.go to reflect the new resource type. // pkg/kubectl/cmd/get.go to reflect the new resource type.
var ( var (
podColumns = []string{"NAME", "READY", "STATUS", "RESTARTS", "AGE"} podColumns = []string{"NAME", "READY", "STATUS", "RESTARTS", "AGE"}
podWideColumns = []string{"IP", "NODE"}
podTemplateColumns = []string{"TEMPLATE", "CONTAINER(S)", "IMAGE(S)", "PODLABELS"} podTemplateColumns = []string{"TEMPLATE", "CONTAINER(S)", "IMAGE(S)", "PODLABELS"}
podDisruptionBudgetColumns = []string{"NAME", "MIN-AVAILABLE", "ALLOWED-DISRUPTIONS", "AGE"} podDisruptionBudgetColumns = []string{"NAME", "MIN-AVAILABLE", "ALLOWED-DISRUPTIONS", "AGE"}
replicationControllerColumns = []string{"NAME", "DESIRED", "CURRENT", "READY", "AGE"} replicationControllerColumns = []string{"NAME", "DESIRED", "CURRENT", "READY", "AGE"}
replicationControllerWideColumns = []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
replicaSetColumns = []string{"NAME", "DESIRED", "CURRENT", "READY", "AGE"} replicaSetColumns = []string{"NAME", "DESIRED", "CURRENT", "READY", "AGE"}
replicaSetWideColumns = []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
jobColumns = []string{"NAME", "DESIRED", "SUCCESSFUL", "AGE"} jobColumns = []string{"NAME", "DESIRED", "SUCCESSFUL", "AGE"}
cronJobColumns = []string{"NAME", "SCHEDULE", "SUSPEND", "ACTIVE", "LAST-SCHEDULE"} cronJobColumns = []string{"NAME", "SCHEDULE", "SUSPEND", "ACTIVE", "LAST-SCHEDULE"}
batchJobWideColumns = []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
serviceColumns = []string{"NAME", "CLUSTER-IP", "EXTERNAL-IP", "PORT(S)", "AGE"} serviceColumns = []string{"NAME", "CLUSTER-IP", "EXTERNAL-IP", "PORT(S)", "AGE"}
serviceWideColumns = []string{"SELECTOR"}
ingressColumns = []string{"NAME", "HOSTS", "ADDRESS", "PORTS", "AGE"} ingressColumns = []string{"NAME", "HOSTS", "ADDRESS", "PORTS", "AGE"}
statefulSetColumns = []string{"NAME", "DESIRED", "CURRENT", "AGE"} statefulSetColumns = []string{"NAME", "DESIRED", "CURRENT", "AGE"}
endpointColumns = []string{"NAME", "ENDPOINTS", "AGE"} endpointColumns = []string{"NAME", "ENDPOINTS", "AGE"}
nodeColumns = []string{"NAME", "STATUS", "AGE", "VERSION"} nodeColumns = []string{"NAME", "STATUS", "AGE", "VERSION"}
nodeWideColumns = []string{"EXTERNAL-IP"}
daemonSetColumns = []string{"NAME", "DESIRED", "CURRENT", "READY", "NODE-SELECTOR", "AGE"} daemonSetColumns = []string{"NAME", "DESIRED", "CURRENT", "READY", "NODE-SELECTOR", "AGE"}
daemonSetWideColumns = []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
eventColumns = []string{"LASTSEEN", "FIRSTSEEN", "COUNT", "NAME", "KIND", "SUBOBJECT", "TYPE", "REASON", "SOURCE", "MESSAGE"} eventColumns = []string{"LASTSEEN", "FIRSTSEEN", "COUNT", "NAME", "KIND", "SUBOBJECT", "TYPE", "REASON", "SOURCE", "MESSAGE"}
limitRangeColumns = []string{"NAME", "AGE"} limitRangeColumns = []string{"NAME", "AGE"}
resourceQuotaColumns = []string{"NAME", "AGE"} resourceQuotaColumns = []string{"NAME", "AGE"}
@ -500,8 +509,10 @@ var (
thirdPartyResourceColumns = []string{"NAME", "DESCRIPTION", "VERSION(S)"} thirdPartyResourceColumns = []string{"NAME", "DESCRIPTION", "VERSION(S)"}
roleColumns = []string{"NAME", "AGE"} roleColumns = []string{"NAME", "AGE"}
roleBindingColumns = []string{"NAME", "AGE"} roleBindingColumns = []string{"NAME", "AGE"}
roleBindingWideColumns = []string{"ROLE", "USERS", "GROUPS", "SERVICEACCOUNTS"}
clusterRoleColumns = []string{"NAME", "AGE"} clusterRoleColumns = []string{"NAME", "AGE"}
clusterRoleBindingColumns = []string{"NAME", "AGE"} clusterRoleBindingColumns = []string{"NAME", "AGE"}
clusterRoleBindingWideColumns = []string{"ROLE", "USERS", "GROUPS", "SERVICEACCOUNTS"}
storageClassColumns = []string{"NAME", "TYPE"} storageClassColumns = []string{"NAME", "TYPE"}
statusColumns = []string{"STATUS", "REASON", "MESSAGE"} statusColumns = []string{"STATUS", "REASON", "MESSAGE"}
@ -510,6 +521,7 @@ var (
horizontalPodAutoscalerColumns = []string{"NAME", "REFERENCE", "TARGET", "CURRENT", "MINPODS", "MAXPODS", "AGE"} horizontalPodAutoscalerColumns = []string{"NAME", "REFERENCE", "TARGET", "CURRENT", "MINPODS", "MAXPODS", "AGE"}
withNamespacePrefixColumns = []string{"NAMESPACE"} // TODO(erictune): print cluster name too. withNamespacePrefixColumns = []string{"NAMESPACE"} // TODO(erictune): print cluster name too.
deploymentColumns = []string{"NAME", "DESIRED", "CURRENT", "UP-TO-DATE", "AVAILABLE", "AGE"} deploymentColumns = []string{"NAME", "DESIRED", "CURRENT", "UP-TO-DATE", "AVAILABLE", "AGE"}
deploymentWideColumns = []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
configMapColumns = []string{"NAME", "DATA", "AGE"} configMapColumns = []string{"NAME", "DATA", "AGE"}
podSecurityPolicyColumns = []string{"NAME", "PRIV", "CAPS", "SELINUX", "RUNASUSER", "FSGROUP", "SUPGROUP", "READONLYROOTFS", "VOLUMES"} podSecurityPolicyColumns = []string{"NAME", "PRIV", "CAPS", "SELINUX", "RUNASUSER", "FSGROUP", "SUPGROUP", "READONLYROOTFS", "VOLUMES"}
clusterColumns = []string{"NAME", "STATUS", "AGE"} clusterColumns = []string{"NAME", "STATUS", "AGE"}
@ -536,79 +548,79 @@ func (h *HumanReadablePrinter) printPodList(podList *api.PodList, w io.Writer, o
// addDefaultHandlers adds print handlers for default Kubernetes types. // addDefaultHandlers adds print handlers for default Kubernetes types.
func (h *HumanReadablePrinter) addDefaultHandlers() { func (h *HumanReadablePrinter) addDefaultHandlers() {
h.Handler(podColumns, h.printPodList) h.Handler(podColumns, podWideColumns, h.printPodList)
h.Handler(podColumns, h.printPod) h.Handler(podColumns, podWideColumns, h.printPod)
h.Handler(podTemplateColumns, printPodTemplate) h.Handler(podTemplateColumns, nil, printPodTemplate)
h.Handler(podTemplateColumns, printPodTemplateList) h.Handler(podTemplateColumns, nil, printPodTemplateList)
h.Handler(podDisruptionBudgetColumns, printPodDisruptionBudget) h.Handler(podDisruptionBudgetColumns, nil, printPodDisruptionBudget)
h.Handler(podDisruptionBudgetColumns, printPodDisruptionBudgetList) h.Handler(podDisruptionBudgetColumns, nil, printPodDisruptionBudgetList)
h.Handler(replicationControllerColumns, printReplicationController) h.Handler(replicationControllerColumns, replicationControllerWideColumns, printReplicationController)
h.Handler(replicationControllerColumns, printReplicationControllerList) h.Handler(replicationControllerColumns, replicationControllerWideColumns, printReplicationControllerList)
h.Handler(replicaSetColumns, printReplicaSet) h.Handler(replicaSetColumns, replicaSetWideColumns, printReplicaSet)
h.Handler(replicaSetColumns, printReplicaSetList) h.Handler(replicaSetColumns, replicaSetWideColumns, printReplicaSetList)
h.Handler(daemonSetColumns, printDaemonSet) h.Handler(daemonSetColumns, daemonSetWideColumns, printDaemonSet)
h.Handler(daemonSetColumns, printDaemonSetList) h.Handler(daemonSetColumns, daemonSetWideColumns, printDaemonSetList)
h.Handler(jobColumns, printJob) h.Handler(jobColumns, batchJobWideColumns, printJob)
h.Handler(jobColumns, printJobList) h.Handler(jobColumns, batchJobWideColumns, printJobList)
h.Handler(cronJobColumns, printCronJob) h.Handler(cronJobColumns, batchJobWideColumns, printCronJob)
h.Handler(cronJobColumns, printCronJobList) h.Handler(cronJobColumns, batchJobWideColumns, printCronJobList)
h.Handler(serviceColumns, printService) h.Handler(serviceColumns, serviceWideColumns, printService)
h.Handler(serviceColumns, printServiceList) h.Handler(serviceColumns, serviceWideColumns, printServiceList)
h.Handler(ingressColumns, printIngress) h.Handler(ingressColumns, nil, printIngress)
h.Handler(ingressColumns, printIngressList) h.Handler(ingressColumns, nil, printIngressList)
h.Handler(statefulSetColumns, printStatefulSet) h.Handler(statefulSetColumns, nil, printStatefulSet)
h.Handler(statefulSetColumns, printStatefulSetList) h.Handler(statefulSetColumns, nil, printStatefulSetList)
h.Handler(endpointColumns, printEndpoints) h.Handler(endpointColumns, nil, printEndpoints)
h.Handler(endpointColumns, printEndpointsList) h.Handler(endpointColumns, nil, printEndpointsList)
h.Handler(nodeColumns, printNode) h.Handler(nodeColumns, nodeWideColumns, printNode)
h.Handler(nodeColumns, printNodeList) h.Handler(nodeColumns, nodeWideColumns, printNodeList)
h.Handler(eventColumns, printEvent) h.Handler(eventColumns, nil, printEvent)
h.Handler(eventColumns, printEventList) h.Handler(eventColumns, nil, printEventList)
h.Handler(limitRangeColumns, printLimitRange) h.Handler(limitRangeColumns, nil, printLimitRange)
h.Handler(limitRangeColumns, printLimitRangeList) h.Handler(limitRangeColumns, nil, printLimitRangeList)
h.Handler(resourceQuotaColumns, printResourceQuota) h.Handler(resourceQuotaColumns, nil, printResourceQuota)
h.Handler(resourceQuotaColumns, printResourceQuotaList) h.Handler(resourceQuotaColumns, nil, printResourceQuotaList)
h.Handler(namespaceColumns, printNamespace) h.Handler(namespaceColumns, nil, printNamespace)
h.Handler(namespaceColumns, printNamespaceList) h.Handler(namespaceColumns, nil, printNamespaceList)
h.Handler(secretColumns, printSecret) h.Handler(secretColumns, nil, printSecret)
h.Handler(secretColumns, printSecretList) h.Handler(secretColumns, nil, printSecretList)
h.Handler(serviceAccountColumns, printServiceAccount) h.Handler(serviceAccountColumns, nil, printServiceAccount)
h.Handler(serviceAccountColumns, printServiceAccountList) h.Handler(serviceAccountColumns, nil, printServiceAccountList)
h.Handler(persistentVolumeClaimColumns, printPersistentVolumeClaim) h.Handler(persistentVolumeClaimColumns, nil, printPersistentVolumeClaim)
h.Handler(persistentVolumeClaimColumns, printPersistentVolumeClaimList) h.Handler(persistentVolumeClaimColumns, nil, printPersistentVolumeClaimList)
h.Handler(persistentVolumeColumns, printPersistentVolume) h.Handler(persistentVolumeColumns, nil, printPersistentVolume)
h.Handler(persistentVolumeColumns, printPersistentVolumeList) h.Handler(persistentVolumeColumns, nil, printPersistentVolumeList)
h.Handler(componentStatusColumns, printComponentStatus) h.Handler(componentStatusColumns, nil, printComponentStatus)
h.Handler(componentStatusColumns, printComponentStatusList) h.Handler(componentStatusColumns, nil, printComponentStatusList)
h.Handler(thirdPartyResourceColumns, printThirdPartyResource) h.Handler(thirdPartyResourceColumns, nil, printThirdPartyResource)
h.Handler(thirdPartyResourceColumns, printThirdPartyResourceList) h.Handler(thirdPartyResourceColumns, nil, printThirdPartyResourceList)
h.Handler(deploymentColumns, printDeployment) h.Handler(deploymentColumns, deploymentWideColumns, printDeployment)
h.Handler(deploymentColumns, printDeploymentList) h.Handler(deploymentColumns, deploymentWideColumns, printDeploymentList)
h.Handler(horizontalPodAutoscalerColumns, printHorizontalPodAutoscaler) h.Handler(horizontalPodAutoscalerColumns, nil, printHorizontalPodAutoscaler)
h.Handler(horizontalPodAutoscalerColumns, printHorizontalPodAutoscalerList) h.Handler(horizontalPodAutoscalerColumns, nil, printHorizontalPodAutoscalerList)
h.Handler(configMapColumns, printConfigMap) h.Handler(configMapColumns, nil, printConfigMap)
h.Handler(configMapColumns, printConfigMapList) h.Handler(configMapColumns, nil, printConfigMapList)
h.Handler(podSecurityPolicyColumns, printPodSecurityPolicy) h.Handler(podSecurityPolicyColumns, nil, printPodSecurityPolicy)
h.Handler(podSecurityPolicyColumns, printPodSecurityPolicyList) h.Handler(podSecurityPolicyColumns, nil, printPodSecurityPolicyList)
h.Handler(thirdPartyResourceDataColumns, printThirdPartyResourceData) h.Handler(thirdPartyResourceDataColumns, nil, printThirdPartyResourceData)
h.Handler(thirdPartyResourceDataColumns, printThirdPartyResourceDataList) h.Handler(thirdPartyResourceDataColumns, nil, printThirdPartyResourceDataList)
h.Handler(clusterColumns, printCluster) h.Handler(clusterColumns, nil, printCluster)
h.Handler(clusterColumns, printClusterList) h.Handler(clusterColumns, nil, printClusterList)
h.Handler(networkPolicyColumns, printNetworkPolicy) h.Handler(networkPolicyColumns, nil, printNetworkPolicy)
h.Handler(networkPolicyColumns, printNetworkPolicyList) h.Handler(networkPolicyColumns, nil, printNetworkPolicyList)
h.Handler(roleColumns, printRole) h.Handler(roleColumns, nil, printRole)
h.Handler(roleColumns, printRoleList) h.Handler(roleColumns, nil, printRoleList)
h.Handler(roleBindingColumns, printRoleBinding) h.Handler(roleBindingColumns, roleBindingWideColumns, printRoleBinding)
h.Handler(roleBindingColumns, printRoleBindingList) h.Handler(roleBindingColumns, roleBindingWideColumns, printRoleBindingList)
h.Handler(clusterRoleColumns, printClusterRole) h.Handler(clusterRoleColumns, nil, printClusterRole)
h.Handler(clusterRoleColumns, printClusterRoleList) h.Handler(clusterRoleColumns, nil, printClusterRoleList)
h.Handler(clusterRoleBindingColumns, printClusterRoleBinding) h.Handler(clusterRoleBindingColumns, clusterRoleBindingWideColumns, printClusterRoleBinding)
h.Handler(clusterRoleBindingColumns, printClusterRoleBindingList) h.Handler(clusterRoleBindingColumns, clusterRoleBindingWideColumns, printClusterRoleBindingList)
h.Handler(certificateSigningRequestColumns, printCertificateSigningRequest) h.Handler(certificateSigningRequestColumns, nil, printCertificateSigningRequest)
h.Handler(certificateSigningRequestColumns, printCertificateSigningRequestList) h.Handler(certificateSigningRequestColumns, nil, printCertificateSigningRequestList)
h.Handler(storageClassColumns, printStorageClass) h.Handler(storageClassColumns, nil, printStorageClass)
h.Handler(storageClassColumns, printStorageClassList) h.Handler(storageClassColumns, nil, printStorageClassList)
h.Handler(statusColumns, printStatus) h.Handler(statusColumns, nil, printStatus)
} }
func (h *HumanReadablePrinter) unknown(data []byte, w io.Writer) error { func (h *HumanReadablePrinter) unknown(data []byte, w io.Writer) error {
@ -2350,43 +2362,6 @@ func formatLabelHeaders(columnLabels []string) []string {
return formHead return formHead
} }
// headers for -o wide
func formatWideHeaders(wide bool, t reflect.Type) []string {
if wide {
if t.String() == "*api.Pod" || t.String() == "*api.PodList" {
return []string{"IP", "NODE"}
}
if t.String() == "*api.ReplicationController" || t.String() == "*api.ReplicationControllerList" {
return []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
}
if t.String() == "*batch.Job" || t.String() == "*batch.JobList" {
return []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
}
if t.String() == "*api.Service" || t.String() == "*api.ServiceList" {
return []string{"SELECTOR"}
}
if t.String() == "*extensions.DaemonSet" || t.String() == "*extensions.DaemonSetList" {
return []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
}
if t.String() == "*extensions.Deployment" || t.String() == "*extensions.DeploymentList" {
return []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
}
if t.String() == "*extensions.ReplicaSet" || t.String() == "*extensions.ReplicaSetList" {
return []string{"CONTAINER(S)", "IMAGE(S)", "SELECTOR"}
}
if t.String() == "*api.Node" || t.String() == "*api.NodeList" {
return []string{"EXTERNAL-IP"}
}
if t.String() == "*rbac.RoleBinding" || t.String() == "*rbac.RoleBindingList" {
return []string{"ROLE", "USERS", "GROUPS", "SERVICEACCOUNTS"}
}
if t.String() == "*rbac.ClusterRoleBinding" || t.String() == "*rbac.ClusterRoleBindingList" {
return []string{"ROLE", "USERS", "GROUPS", "SERVICEACCOUNTS"}
}
}
return nil
}
// headers for --show-labels=true // headers for --show-labels=true
func formatShowLabelsHeader(showLabels bool, t reflect.Type) []string { func formatShowLabelsHeader(showLabels bool, t reflect.Type) []string {
if showLabels { if showLabels {
@ -2418,7 +2393,10 @@ func (h *HumanReadablePrinter) PrintObj(obj runtime.Object, output io.Writer) er
t := reflect.TypeOf(obj) t := reflect.TypeOf(obj)
if handler := h.handlerMap[t]; handler != nil { if handler := h.handlerMap[t]; handler != nil {
if !h.options.NoHeaders && t != h.lastType { if !h.options.NoHeaders && t != h.lastType {
headers := append(handler.columns, formatWideHeaders(h.options.Wide, t)...) headers := handler.columns
if h.options.Wide {
headers = append(headers, handler.columnsWithWide...)
}
headers = append(headers, formatLabelHeaders(h.options.ColumnLabels)...) headers = append(headers, formatLabelHeaders(h.options.ColumnLabels)...)
// LABELS is always the last column. // LABELS is always the last column.
headers = append(headers, formatShowLabelsHeader(h.options.ShowLabels, t)...) headers = append(headers, formatShowLabelsHeader(h.options.ShowLabels, t)...)

6
pkg/kubectl/resource_printer_test.go
View File

@ -256,7 +256,7 @@ func ErrorPrintHandler(obj *TestPrintType, w io.Writer, options PrintOptions) er
func TestCustomTypePrinting(t *testing.T) { func TestCustomTypePrinting(t *testing.T) {
columns := []string{"Data"} columns := []string{"Data"}
printer := NewHumanReadablePrinter(PrintOptions{}) printer := NewHumanReadablePrinter(PrintOptions{})
printer.Handler(columns, PrintCustomType) printer.Handler(columns, nil, PrintCustomType)
obj := TestPrintType{"test object"} obj := TestPrintType{"test object"}
buffer := &bytes.Buffer{} buffer := &bytes.Buffer{}
@ -273,7 +273,7 @@ func TestCustomTypePrinting(t *testing.T) {
func TestCustomTypePrintingWithKind(t *testing.T) { func TestCustomTypePrintingWithKind(t *testing.T) {
columns := []string{"Data"} columns := []string{"Data"}
printer := NewHumanReadablePrinter(PrintOptions{}) printer := NewHumanReadablePrinter(PrintOptions{})
printer.Handler(columns, PrintCustomType) printer.Handler(columns, nil, PrintCustomType)
printer.EnsurePrintWithKind("test") printer.EnsurePrintWithKind("test")
obj := TestPrintType{"test object"} obj := TestPrintType{"test object"}
@ -291,7 +291,7 @@ func TestCustomTypePrintingWithKind(t *testing.T) {
func TestPrintHandlerError(t *testing.T) { func TestPrintHandlerError(t *testing.T) {
columns := []string{"Data"} columns := []string{"Data"}
printer := NewHumanReadablePrinter(PrintOptions{}) printer := NewHumanReadablePrinter(PrintOptions{})
printer.Handler(columns, ErrorPrintHandler) printer.Handler(columns, nil, ErrorPrintHandler)
obj := TestPrintType{"test object"} obj := TestPrintType{"test object"}
buffer := &bytes.Buffer{} buffer := &bytes.Buffer{}
err := printer.PrintObj(&obj, buffer) err := printer.PrintObj(&obj, buffer)