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options.go
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options.go
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package home
import (
"fmt"
"net"
"os"
"strconv"
"github.com/AdguardTeam/AdGuardHome/internal/version"
)
// options passed from command-line arguments
type options struct {
verbose bool // is verbose logging enabled
configFilename string // path to the config file
workDir string // path to the working directory where we will store the filters data and the querylog
bindHost net.IP // host address to bind HTTP server on
bindPort int // port to serve HTTP pages on
logFile string // Path to the log file. If empty, write to stdout. If "syslog", writes to syslog
pidFile string // File name to save PID to
checkConfig bool // Check configuration and exit
disableUpdate bool // If set, don't check for updates
// service control action (see service.ControlAction array + "status" command)
serviceControlAction string
// runningAsService flag is set to true when options are passed from the service runner
runningAsService bool
// disableMemoryOptimization - disables memory optimization hacks
// see memoryUsage() function for the details
disableMemoryOptimization bool
glinetMode bool // Activate GL-Inet compatibility mode
}
// functions used for their side-effects
type effect func() error
type arg struct {
description string // a short, English description of the argument
longName string // the name of the argument used after '--'
shortName string // the name of the argument used after '-'
// only one of updateWithValue, updateNoValue, and effect should be present
updateWithValue func(o options, v string) (options, error) // the mutator for arguments with parameters
updateNoValue func(o options) (options, error) // the mutator for arguments without parameters
effect func(o options, exec string) (f effect, err error) // the side-effect closure generator
serialize func(o options) []string // the re-serialization function back to arguments (return nil for omit)
}
// {type}SliceOrNil functions check their parameter of type {type}
// against its zero value and return nil if the parameter value is
// zero otherwise they return a string slice of the parameter
func ipSliceOrNil(ip net.IP) []string {
if ip == nil {
return nil
}
return []string{ip.String()}
}
func stringSliceOrNil(s string) []string {
if s == "" {
return nil
}
return []string{s}
}
func intSliceOrNil(i int) []string {
if i == 0 {
return nil
}
return []string{strconv.Itoa(i)}
}
func boolSliceOrNil(b bool) []string {
if b {
return []string{}
}
return nil
}
var args []arg
var configArg = arg{
"Path to the config file",
"config", "c",
func(o options, v string) (options, error) { o.configFilename = v; return o, nil },
nil,
nil,
func(o options) []string { return stringSliceOrNil(o.configFilename) },
}
var workDirArg = arg{
"Path to the working directory",
"work-dir", "w",
func(o options, v string) (options, error) { o.workDir = v; return o, nil }, nil, nil,
func(o options) []string { return stringSliceOrNil(o.workDir) },
}
var hostArg = arg{
"Host address to bind HTTP server on",
"host", "h",
func(o options, v string) (options, error) { o.bindHost = net.ParseIP(v); return o, nil }, nil, nil,
func(o options) []string { return ipSliceOrNil(o.bindHost) },
}
var portArg = arg{
"Port to serve HTTP pages on",
"port", "p",
func(o options, v string) (options, error) {
var err error
var p int
minPort, maxPort := 0, 1<<16-1
if p, err = strconv.Atoi(v); err != nil {
err = fmt.Errorf("port %q is not a number", v)
} else if p < minPort || p > maxPort {
err = fmt.Errorf("port %d not in range %d - %d", p, minPort, maxPort)
} else {
o.bindPort = p
}
return o, err
}, nil, nil,
func(o options) []string { return intSliceOrNil(o.bindPort) },
}
var serviceArg = arg{
"Service control action: status, install, uninstall, start, stop, restart, reload (configuration)",
"service", "s",
func(o options, v string) (options, error) {
o.serviceControlAction = v
return o, nil
}, nil, nil,
func(o options) []string { return stringSliceOrNil(o.serviceControlAction) },
}
var logfileArg = arg{
"Path to log file. If empty: write to stdout; if 'syslog': write to system log",
"logfile", "l",
func(o options, v string) (options, error) { o.logFile = v; return o, nil }, nil, nil,
func(o options) []string { return stringSliceOrNil(o.logFile) },
}
var pidfileArg = arg{
"Path to a file where PID is stored",
"pidfile", "",
func(o options, v string) (options, error) { o.pidFile = v; return o, nil }, nil, nil,
func(o options) []string { return stringSliceOrNil(o.pidFile) },
}
var checkConfigArg = arg{
"Check configuration and exit",
"check-config", "",
nil, func(o options) (options, error) { o.checkConfig = true; return o, nil }, nil,
func(o options) []string { return boolSliceOrNil(o.checkConfig) },
}
var noCheckUpdateArg = arg{
"Don't check for updates",
"no-check-update", "",
nil, func(o options) (options, error) { o.disableUpdate = true; return o, nil }, nil,
func(o options) []string { return boolSliceOrNil(o.disableUpdate) },
}
var disableMemoryOptimizationArg = arg{
"Disable memory optimization",
"no-mem-optimization", "",
nil, func(o options) (options, error) { o.disableMemoryOptimization = true; return o, nil }, nil,
func(o options) []string { return boolSliceOrNil(o.disableMemoryOptimization) },
}
var verboseArg = arg{
"Enable verbose output",
"verbose", "v",
nil, func(o options) (options, error) { o.verbose = true; return o, nil }, nil,
func(o options) []string { return boolSliceOrNil(o.verbose) },
}
var glinetArg = arg{
"Run in GL-Inet compatibility mode",
"glinet", "",
nil, func(o options) (options, error) { o.glinetMode = true; return o, nil }, nil,
func(o options) []string { return boolSliceOrNil(o.glinetMode) },
}
var versionArg = arg{
"Show the version and exit",
"version", "",
nil, nil, func(o options, exec string) (effect, error) {
return func() error { fmt.Println(version.Full()); os.Exit(0); return nil }, nil
},
func(o options) []string { return nil },
}
var helpArg = arg{
"Print this help",
"help", "",
nil, nil, func(o options, exec string) (effect, error) {
return func() error { _ = printHelp(exec); os.Exit(64); return nil }, nil
},
func(o options) []string { return nil },
}
func init() {
args = []arg{
configArg,
workDirArg,
hostArg,
portArg,
serviceArg,
logfileArg,
pidfileArg,
checkConfigArg,
noCheckUpdateArg,
disableMemoryOptimizationArg,
verboseArg,
glinetArg,
versionArg,
helpArg,
}
}
func getUsageLines(exec string, args []arg) []string {
usage := []string{
"Usage:",
"",
fmt.Sprintf("%s [options]", exec),
"",
"Options:",
}
for _, arg := range args {
val := ""
if arg.updateWithValue != nil {
val = " VALUE"
}
if arg.shortName != "" {
usage = append(usage, fmt.Sprintf(" -%s, %-30s %s",
arg.shortName,
"--"+arg.longName+val,
arg.description))
} else {
usage = append(usage, fmt.Sprintf(" %-34s %s",
"--"+arg.longName+val,
arg.description))
}
}
return usage
}
func printHelp(exec string) error {
for _, line := range getUsageLines(exec, args) {
_, err := fmt.Println(line)
if err != nil {
return err
}
}
return nil
}
func argMatches(a arg, v string) bool {
return v == "--"+a.longName || (a.shortName != "" && v == "-"+a.shortName)
}
func parse(exec string, ss []string) (o options, f effect, err error) {
for i := 0; i < len(ss); i++ {
v := ss[i]
knownParam := false
for _, arg := range args {
if argMatches(arg, v) {
if arg.updateWithValue != nil {
if i+1 >= len(ss) {
return o, f, fmt.Errorf("got %s without argument", v)
}
i++
o, err = arg.updateWithValue(o, ss[i])
if err != nil {
return
}
} else if arg.updateNoValue != nil {
o, err = arg.updateNoValue(o)
if err != nil {
return
}
} else if arg.effect != nil {
var eff effect
eff, err = arg.effect(o, exec)
if err != nil {
return
}
if eff != nil {
prevf := f
f = func() (ferr error) {
if prevf != nil {
ferr = prevf()
}
if ferr == nil {
ferr = eff()
}
return ferr
}
}
}
knownParam = true
break
}
}
if !knownParam {
return o, f, fmt.Errorf("unknown option %v", v)
}
}
return
}
func shortestFlag(a arg) string {
if a.shortName != "" {
return "-" + a.shortName
}
return "--" + a.longName
}
func serialize(o options) []string {
ss := []string{}
for _, arg := range args {
s := arg.serialize(o)
if s != nil {
ss = append(ss, append([]string{shortestFlag(arg)}, s...)...)
}
}
return ss
}