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formatter.go
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formatter.go
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package version
import (
"bytes"
"encoding/json"
"fmt"
)
const (
PrettyFormat string = "pretty"
JSONFormat string = "json"
)
type Formatter interface {
Format(info *VersionInfo) (string, error)
}
func GetSupportedFormats() []string {
return []string{PrettyFormat, JSONFormat}
}
func NewFormatter(format string) (Formatter, error) {
switch format {
case PrettyFormat:
return newPrettyFormatter(), nil
case JSONFormat:
return newJSONFormatter(), nil
default:
return nil, fmt.Errorf("Unknown format: %s", format)
}
}
type prettyFormatter struct{}
func newPrettyFormatter() Formatter {
return &prettyFormatter{}
}
func (_ *prettyFormatter) Format(info *VersionInfo) (string, error) {
var buffer bytes.Buffer
buffer.WriteString(fmt.Sprintf("Consul v%s\n", info.HumanVersion))
if info.Revision != "" {
buffer.WriteString(fmt.Sprintf("Revision %s\n", info.Revision))
}
var supplement string
if info.RPC.Default < info.RPC.Max {
supplement = fmt.Sprintf(" (agent will automatically use protocol >%d when speaking to compatible agents)",
info.RPC.Default)
}
buffer.WriteString(fmt.Sprintf("Protocol %d spoken by default, understands %d to %d%s\n",
info.RPC.Default, info.RPC.Min, info.RPC.Max, supplement))
return buffer.String(), nil
}
type jsonFormatter struct{}
func newJSONFormatter() Formatter {
return &jsonFormatter{}
}
func (_ *jsonFormatter) Format(info *VersionInfo) (string, error) {
b, err := json.MarshalIndent(info, "", " ")
if err != nil {
return "", fmt.Errorf("Failed to marshal version info: %v", err)
}
return string(b), nil
}