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formatter.go
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formatter.go
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package bindingrule
import (
"bytes"
"encoding/json"
"fmt"
"github.com/hashicorp/consul/api"
)
const (
PrettyFormat string = "pretty"
JSONFormat string = "json"
)
// Formatter defines methods provided by bindingrule command output formatter
type Formatter interface {
FormatBindingRule(rule *api.ACLBindingRule) (string, error)
FormatBindingRuleList(rules []*api.ACLBindingRule) (string, error)
}
// GetSupportedFormats returns supported formats
func GetSupportedFormats() []string {
return []string{PrettyFormat, JSONFormat}
}
// NewFormatter returns Formatter implementation
func NewFormatter(format string, showMeta bool) (formatter Formatter, err error) {
switch format {
case PrettyFormat:
formatter = newPrettyFormatter(showMeta)
case JSONFormat:
formatter = newJSONFormatter(showMeta)
default:
err = fmt.Errorf("Unknown format: %s", format)
}
return formatter, err
}
func newPrettyFormatter(showMeta bool) Formatter {
return &prettyFormatter{showMeta}
}
type prettyFormatter struct {
showMeta bool
}
func (f *prettyFormatter) FormatBindingRule(rule *api.ACLBindingRule) (string, error) {
var buffer bytes.Buffer
buffer.WriteString(fmt.Sprintf("ID: %s\n", rule.ID))
if rule.Namespace != "" {
buffer.WriteString(fmt.Sprintf("Namespace: %s\n", rule.Namespace))
}
buffer.WriteString(fmt.Sprintf("AuthMethod: %s\n", rule.AuthMethod))
buffer.WriteString(fmt.Sprintf("Description: %s\n", rule.Description))
buffer.WriteString(fmt.Sprintf("BindType: %s\n", rule.BindType))
buffer.WriteString(fmt.Sprintf("BindName: %s\n", rule.BindName))
buffer.WriteString(fmt.Sprintf("Selector: %s\n", rule.Selector))
if f.showMeta {
buffer.WriteString(fmt.Sprintf("Create Index: %d\n", rule.CreateIndex))
buffer.WriteString(fmt.Sprintf("Modify Index: %d\n", rule.ModifyIndex))
}
return buffer.String(), nil
}
func (f *prettyFormatter) FormatBindingRuleList(rules []*api.ACLBindingRule) (string, error) {
var buffer bytes.Buffer
for _, rule := range rules {
buffer.WriteString(f.formatBindingRuleListEntry(rule))
}
return buffer.String(), nil
}
func (f *prettyFormatter) formatBindingRuleListEntry(rule *api.ACLBindingRule) string {
var buffer bytes.Buffer
buffer.WriteString(fmt.Sprintf("%s:\n", rule.ID))
if rule.Namespace != "" {
buffer.WriteString(fmt.Sprintf(" Namespace: %s\n", rule.Namespace))
}
buffer.WriteString(fmt.Sprintf(" AuthMethod: %s\n", rule.AuthMethod))
buffer.WriteString(fmt.Sprintf(" Description: %s\n", rule.Description))
buffer.WriteString(fmt.Sprintf(" BindType: %s\n", rule.BindType))
buffer.WriteString(fmt.Sprintf(" BindName: %s\n", rule.BindName))
buffer.WriteString(fmt.Sprintf(" Selector: %s\n", rule.Selector))
if f.showMeta {
buffer.WriteString(fmt.Sprintf(" Create Index: %d\n", rule.CreateIndex))
buffer.WriteString(fmt.Sprintf(" Modify Index: %d\n", rule.ModifyIndex))
}
return buffer.String()
}
func newJSONFormatter(showMeta bool) Formatter {
return &jsonFormatter{showMeta}
}
type jsonFormatter struct {
showMeta bool
}
func (f *jsonFormatter) FormatBindingRule(rule *api.ACLBindingRule) (string, error) {
b, err := json.MarshalIndent(rule, "", " ")
if err != nil {
return "", fmt.Errorf("Failed to marshal binding rule:, %v", err)
}
return string(b), nil
}
func (f *jsonFormatter) FormatBindingRuleList(rules []*api.ACLBindingRule) (string, error) {
b, err := json.MarshalIndent(rules, "", " ")
if err != nil {
return "", fmt.Errorf("Failed to marshal binding rules:, %v", err)
}
return string(b), nil
}