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/*
* Copyright (c) 2022. Nydus Developers. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package command
import (
"fmt"
"reflect"
"strconv"
"github.com/pkg/errors"
)
type Opt = func(cmd *DaemonCommand)
// Define how to build a command line to start a nydusd daemon
type DaemonCommand struct {
// "singleton" "fuse"
Mode string `type:"subcommand"`
// "blobcache" "fscache" "virtiofs"
FscacheDriver string `type:"param" name:"fscache"`
FscacheThreads string `type:"param" name:"fscache-threads"`
Upgrade bool `type:"flag" name:"upgrade" default:""`
ThreadNum string `type:"param" name:"thread-num"`
// `--id` is required by `--supervisor` when starting nydusd
ID string `type:"param" name:"id"`
Config string `type:"param" name:"config"`
Bootstrap string `type:"param" name:"bootstrap"`
Mountpoint string `type:"param" name:"mountpoint"`
APISock string `type:"param" name:"apisock"`
LogLevel string `type:"param" name:"log-level"`
LogRotationSize int `type:"param" name:"log-rotation-size"`
Supervisor string `type:"param" name:"supervisor"`
LogFile string `type:"param" name:"log-file"`
PrefetchFiles string `type:"param" name:"prefetch-files"`
}
// Build exec style command line
func BuildCommand(opts []Opt) ([]string, error) {
var cmd DaemonCommand
var subcommand string
for _, o := range opts {
o(&cmd)
}
args := make([]string, 0, 32)
t := reflect.TypeOf(cmd)
v := reflect.ValueOf(cmd)
for i := 0; i < t.NumField(); i++ {
tag := t.Field(i).Tag
argType := tag.Get("type")
switch argType {
case "param":
// Zero value will be skipped appending to command line
if v.Field(i).IsZero() {
continue
}
value := v.Field(i).Interface()
pair := []string{fmt.Sprintf("--%s", tag.Get("name")), fmt.Sprintf("%v", value)}
args = append(args, pair...)
case "subcommand":
// Zero value will be skipped appending to command line
if v.Field(i).IsZero() {
continue
}
subcommand = v.Field(i).String()
case "flag":
kind := v.Field(i).Kind()
if kind != reflect.Bool {
return nil, errors.Errorf("flag must be boolean")
}
v := v.Field(i).Bool()
if v {
flag := fmt.Sprintf("--%s", tag.Get("name"))
args = append(args, flag)
} else {
continue
}
default:
return nil, errors.Errorf("unknown tag type: %s ", argType)
}
}
if subcommand != "" {
// Ensure subcommand is at the first place.
args = append([]string{subcommand}, args...)
}
return args, nil
}
func WithMode(m string) Opt {
return func(cmd *DaemonCommand) {
cmd.Mode = m
}
}
func WithPrefetchFiles(p string) Opt {
return func(cmd *DaemonCommand) {
cmd.PrefetchFiles = p
}
}
func WithFscacheDriver(w string) Opt {
return func(cmd *DaemonCommand) {
cmd.FscacheDriver = w
}
}
func WithFscacheThreads(num int) Opt {
return func(cmd *DaemonCommand) {
cmd.FscacheThreads = strconv.Itoa(num)
}
}
func WithThreadNum(num int) Opt {
return func(cmd *DaemonCommand) {
cmd.ThreadNum = strconv.Itoa(num)
}
}
func WithConfig(config string) Opt {
return func(cmd *DaemonCommand) {
cmd.Config = config
}
}
func WithBootstrap(b string) Opt {
return func(cmd *DaemonCommand) {
cmd.Bootstrap = b
}
}
func WithMountpoint(m string) Opt {
return func(cmd *DaemonCommand) {
cmd.Mountpoint = m
}
}
func WithAPISock(api string) Opt {
return func(cmd *DaemonCommand) {
cmd.APISock = api
}
}
func WithLogFile(l string) Opt {
return func(cmd *DaemonCommand) {
cmd.LogFile = l
}
}
func WithLogLevel(l string) Opt {
return func(cmd *DaemonCommand) {
cmd.LogLevel = l
}
}
func WithLogRotationSize(l int) Opt {
return func(cmd *DaemonCommand) {
cmd.LogRotationSize = l
}
}
func WithSupervisor(s string) Opt {
return func(cmd *DaemonCommand) {
cmd.Supervisor = s
}
}
func WithID(id string) Opt {
return func(cmd *DaemonCommand) {
cmd.ID = id
}
}
func WithUpgrade() Opt {
return func(cmd *DaemonCommand) {
cmd.Upgrade = true
}
}
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