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formatter.go
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formatter.go
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package policy
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"github.com/hashicorp/consul/api"
)
const (
PrettyFormat string = "pretty"
JSONFormat string = "json"
)
// Formatter defines methods provided by policy command output formatter
type Formatter interface {
FormatPolicy(policy *api.ACLPolicy) (string, error)
FormatPolicyList(policies []*api.ACLPolicyListEntry) (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) FormatPolicy(policy *api.ACLPolicy) (string, error) {
var buffer bytes.Buffer
buffer.WriteString(fmt.Sprintf("ID: %s\n", policy.ID))
buffer.WriteString(fmt.Sprintf("Name: %s\n", policy.Name))
if policy.Namespace != "" {
buffer.WriteString(fmt.Sprintf("Namespace: %s\n", policy.Namespace))
}
buffer.WriteString(fmt.Sprintf("Description: %s\n", policy.Description))
buffer.WriteString(fmt.Sprintf("Datacenters: %s\n", strings.Join(policy.Datacenters, ", ")))
if f.showMeta {
buffer.WriteString(fmt.Sprintf("Hash: %x\n", policy.Hash))
buffer.WriteString(fmt.Sprintf("Create Index: %d\n", policy.CreateIndex))
buffer.WriteString(fmt.Sprintf("Modify Index: %d\n", policy.ModifyIndex))
}
buffer.WriteString(fmt.Sprintln("Rules:"))
buffer.WriteString(policy.Rules)
return buffer.String(), nil
}
func (f *prettyFormatter) FormatPolicyList(policies []*api.ACLPolicyListEntry) (string, error) {
var buffer bytes.Buffer
for _, policy := range policies {
buffer.WriteString(f.formatPolicyListEntry(policy))
}
return buffer.String(), nil
}
func (f *prettyFormatter) formatPolicyListEntry(policy *api.ACLPolicyListEntry) string {
var buffer bytes.Buffer
buffer.WriteString(fmt.Sprintf("%s:\n", policy.Name))
buffer.WriteString(fmt.Sprintf(" ID: %s\n", policy.ID))
if policy.Namespace != "" {
buffer.WriteString(fmt.Sprintf(" Namespace: %s\n", policy.Namespace))
}
buffer.WriteString(fmt.Sprintf(" Description: %s\n", policy.Description))
buffer.WriteString(fmt.Sprintf(" Datacenters: %s\n", strings.Join(policy.Datacenters, ", ")))
if f.showMeta {
buffer.WriteString(fmt.Sprintf(" Hash: %x\n", policy.Hash))
buffer.WriteString(fmt.Sprintf(" Create Index: %d\n", policy.CreateIndex))
buffer.WriteString(fmt.Sprintf(" Modify Index: %d\n", policy.ModifyIndex))
}
return buffer.String()
}
func newJSONFormatter(showMeta bool) Formatter {
return &jsonFormatter{showMeta}
}
type jsonFormatter struct {
showMeta bool
}
func (f *jsonFormatter) FormatPolicy(policy *api.ACLPolicy) (string, error) {
b, err := json.MarshalIndent(policy, "", " ")
if err != nil {
return "", fmt.Errorf("Failed to marshal policy: %v", err)
}
return string(b), nil
}
func (f *jsonFormatter) FormatPolicyList(policies []*api.ACLPolicyListEntry) (string, error) {
b, err := json.MarshalIndent(policies, "", " ")
if err != nil {
return "", fmt.Errorf("Failed to marshal policies: %v", err)
}
return string(b), nil
}