Pull request 1879: nextapi-opts
Merge in DNS/adguard-home from nextapi-opts to master
Squashed commit of the following:
commit 01f27e374785f47f41470126ddc17cf447e84dd7
Merge: 17d3b06e0 371261b2c
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Tue Jun 20 13:43:08 2023 +0300
Merge branch 'master' into nextapi-opts
commit 17d3b06e0551908b06be67233181ce4067b6c1cc
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Tue Jun 20 13:15:31 2023 +0300
next: imp chlog
commit 19d5ea9db0ee077c55c9f1d54a07a3c6b56b4e2e
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Tue Jun 20 12:58:48 2023 +0300
cmd: typo
commit 082ad5b5fc634a1533127e428680ccf55c0811ab
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Mon Jun 19 22:49:16 2023 +0300
cmd: imp api, docs, names
commit a49b3cbcc591f36530306c2e08cf1ea7dc8f6d30
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Mon Jun 19 17:13:50 2023 +0300
next/cmd: add opt parsing
This commit is contained in:
Ainar Garipov
403
internal/next/cmd/opt.go
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403
internal/next/cmd/opt.go
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@@ -0,0 +1,403 @@
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package cmd
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import (
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"flag"
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"fmt"
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"io"
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"net/netip"
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"os"
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"strings"
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"github.com/AdguardTeam/AdGuardHome/internal/version"
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"golang.org/x/exp/slices"
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)
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// options contains all command-line options for the AdGuardHome(.exe) binary.
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type options struct {
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// confFile is the path to the configuration file.
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confFile string
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// logFile is the path to the log file. Special values:
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//
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// - "stdout": Write to stdout (the default).
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// - "stderr": Write to stderr.
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// - "syslog": Write to the system log.
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logFile string
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// pidFile is the path to the file where to store the PID.
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//
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// TODO(a.garipov): Use.
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pidFile string
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// serviceAction is the service control action to perform:
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//
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// - "install": Installs AdGuard Home as a system service.
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// - "uninstall": Uninstalls it.
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// - "status": Prints the service status.
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// - "start": Starts the previously installed service.
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// - "stop": Stops the previously installed service.
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// - "restart": Restarts the previously installed service.
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// - "reload": Reloads the configuration.
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// - "run": This is a special command that is not supposed to be used
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// directly it is specified when we register a service, and it indicates
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// to the app that it is being run as a service.
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//
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// TODO(a.garipov): Use.
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serviceAction string
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// workDir is the path to the working directory. It is applied before all
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// other configuration is read, so all relative paths are relative to it.
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workDir string
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// webAddrs contains the addresses on which to serve the web UI.
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//
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// TODO(a.garipov): Use.
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webAddrs []netip.AddrPort
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// checkConfig, if true, instructs AdGuard Home to check the configuration
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// file and exit with a corresponding exit code.
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//
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// TODO(a.garipov): Use.
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checkConfig bool
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// disableUpdate, if true, prevents AdGuard Home from automatically checking
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// for updates.
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//
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// TODO(a.garipov): Use.
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disableUpdate bool
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// glinetMode enables the GL-Inet compatibility mode.
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//
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// TODO(a.garipov): Use.
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glinetMode bool
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// help, if true, instructs AdGuard Home to print the command-line option
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// help message and quit with a successful exit-code.
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help bool
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// localFrontend, if true, instructs AdGuard Home to use the local frontend
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// directory instead of the files compiled into the binary.
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//
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// TODO(a.garipov): Use.
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localFrontend bool
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// performUpdate, if true, instructs AdGuard Home to update the current
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// binary and restart the service in case it's installed.
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//
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// TODO(a.garipov): Use.
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performUpdate bool
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// verbose, if true, instructs AdGuard Home to enable verbose logging.
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verbose bool
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// version, if true, instructs AdGuard Home to print the version to stdout
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// and quit with a successful exit-code. If verbose is also true, print a
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// more detailed version description.
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version bool
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}
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// Indexes to help with the [commandLineOptions] initialization.
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const (
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confFileIdx = iota
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logFileIdx
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pidFileIdx
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serviceActionIdx
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workDirIdx
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webAddrsIdx
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checkConfigIdx
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disableUpdateIdx
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glinetModeIdx
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helpIdx
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localFrontend
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performUpdateIdx
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verboseIdx
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versionIdx
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)
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// commandLineOption contains information about a command-line option: its long
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// and, if there is one, short forms, the value type, the description, and the
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// default value.
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type commandLineOption struct {
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defaultValue any
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description string
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long string
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short string
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valueType string
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}
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// commandLineOptions are all command-line options currently supported by
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// AdGuard Home.
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var commandLineOptions = []*commandLineOption{
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confFileIdx: {
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// TODO(a.garipov): Remove the ".1" when the new code is ready.
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defaultValue: "AdGuardHome.1.yaml",
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description: "Path to the config file.",
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long: "config",
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short: "c",
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valueType: "path",
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},
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logFileIdx: {
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defaultValue: "stdout",
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description: `Path to log file. Special values include "stdout", "stderr", and "syslog".`,
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long: "logfile",
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short: "l",
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valueType: "path",
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},
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pidFileIdx: {
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defaultValue: "",
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description: "Path to the file where to store the PID.",
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long: "pidfile",
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short: "",
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valueType: "path",
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},
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serviceActionIdx: {
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defaultValue: "",
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description: `Service control action: "status", "install" (as a service), ` +
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`"uninstall" (as a service), "start", "stop", "restart", "reload" (configuration).`,
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long: "service",
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short: "s",
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valueType: "action",
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},
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workDirIdx: {
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defaultValue: "",
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description: `Path to the working directory. ` +
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`It is applied before all other configuration is read, ` +
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`so all relative paths are relative to it.`,
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long: "work-dir",
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short: "w",
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valueType: "path",
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},
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webAddrsIdx: {
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defaultValue: []netip.AddrPort(nil),
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description: `Address(es) to serve the web UI on, in the host:port format. ` +
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`Can be used multiple times.`,
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long: "web-addr",
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short: "",
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valueType: "host:port",
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},
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checkConfigIdx: {
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defaultValue: false,
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description: "Check configuration and quit.",
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long: "check-config",
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short: "",
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valueType: "",
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},
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disableUpdateIdx: {
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defaultValue: false,
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description: "Disable automatic update checking.",
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long: "no-check-update",
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short: "",
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valueType: "",
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},
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glinetModeIdx: {
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defaultValue: false,
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description: "Run in GL-Inet compatibility mode.",
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long: "glinet",
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short: "",
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valueType: "",
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},
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helpIdx: {
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defaultValue: false,
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description: "Print this help message and quit.",
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long: "help",
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short: "h",
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valueType: "",
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},
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localFrontend: {
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defaultValue: false,
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description: "Use local frontend directories.",
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long: "local-frontend",
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short: "",
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valueType: "",
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},
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performUpdateIdx: {
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defaultValue: false,
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description: "Update the current binary and restart the service in case it's installed.",
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long: "update",
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short: "",
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valueType: "",
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},
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verboseIdx: {
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defaultValue: false,
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description: "Enable verbose logging.",
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long: "verbose",
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short: "v",
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valueType: "",
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},
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versionIdx: {
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defaultValue: false,
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description: `Print the version to stdout and quit. ` +
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`Print a more detailed version description with -v.`,
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long: "version",
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short: "",
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valueType: "",
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},
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}
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// parseOptions parses the command-line options for AdGuardHome.
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func parseOptions(cmdName string, args []string) (opts *options, err error) {
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flags := flag.NewFlagSet(cmdName, flag.ContinueOnError)
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opts = &options{}
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for i, fieldPtr := range []any{
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confFileIdx: &opts.confFile,
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logFileIdx: &opts.logFile,
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pidFileIdx: &opts.pidFile,
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serviceActionIdx: &opts.serviceAction,
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workDirIdx: &opts.workDir,
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webAddrsIdx: &opts.webAddrs,
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checkConfigIdx: &opts.checkConfig,
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disableUpdateIdx: &opts.disableUpdate,
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glinetModeIdx: &opts.glinetMode,
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helpIdx: &opts.help,
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localFrontend: &opts.localFrontend,
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performUpdateIdx: &opts.performUpdate,
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verboseIdx: &opts.verbose,
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versionIdx: &opts.version,
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} {
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addOption(flags, fieldPtr, commandLineOptions[i])
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}
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flags.Usage = func() { usage(cmdName, os.Stderr) }
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err = flags.Parse(args)
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if err != nil {
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// Don't wrap the error, because it's informative enough as is.
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return nil, err
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}
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return opts, nil
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}
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// addOption adds the command-line option described by o to flags using fieldPtr
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// as the pointer to the value.
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func addOption(flags *flag.FlagSet, fieldPtr any, o *commandLineOption) {
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switch fieldPtr := fieldPtr.(type) {
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case *string:
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flags.StringVar(fieldPtr, o.long, o.defaultValue.(string), o.description)
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if o.short != "" {
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flags.StringVar(fieldPtr, o.short, o.defaultValue.(string), o.description)
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}
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case *[]netip.AddrPort:
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flags.Func(o.long, o.description, func(s string) (err error) {
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addr, err := netip.ParseAddrPort(s)
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if err != nil {
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// Don't wrap the error, because it's informative enough as is.
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return err
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}
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*fieldPtr = append(*fieldPtr, addr)
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return nil
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})
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case *bool:
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flags.BoolVar(fieldPtr, o.long, o.defaultValue.(bool), o.description)
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if o.short != "" {
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flags.BoolVar(fieldPtr, o.short, o.defaultValue.(bool), o.description)
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}
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default:
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panic(fmt.Errorf("unexpected field pointer type %T", fieldPtr))
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}
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}
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// usage prints a usage message similar to the one printed by package flag but
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// taking long vs. short versions into account as well as using more informative
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// value hints.
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func usage(cmdName string, output io.Writer) {
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options := slices.Clone(commandLineOptions)
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slices.SortStableFunc(options, func(a, b *commandLineOption) (sortsBefore bool) {
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return a.long < b.long
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})
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b := &strings.Builder{}
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_, _ = fmt.Fprintf(b, "Usage of %s:\n", cmdName)
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for _, o := range options {
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writeUsageLine(b, o)
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// Use four spaces before the tab to trigger good alignment for both 4-
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// and 8-space tab stops.
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if shouldIncludeDefault(o.defaultValue) {
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_, _ = fmt.Fprintf(b, " \t%s (Default value: %q)\n", o.description, o.defaultValue)
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} else {
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_, _ = fmt.Fprintf(b, " \t%s\n", o.description)
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}
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}
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_, _ = io.WriteString(output, b.String())
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}
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// shouldIncludeDefault returns true if this default value should be printed.
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func shouldIncludeDefault(v any) (ok bool) {
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switch v := v.(type) {
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case bool:
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return v
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case string:
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return v != ""
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default:
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return v == nil
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}
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}
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// writeUsageLine writes the usage line for the provided command-line option.
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func writeUsageLine(b *strings.Builder, o *commandLineOption) {
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if o.short == "" {
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if o.valueType == "" {
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_, _ = fmt.Fprintf(b, " --%s\n", o.long)
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} else {
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_, _ = fmt.Fprintf(b, " --%s=%s\n", o.long, o.valueType)
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}
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return
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}
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if o.valueType == "" {
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_, _ = fmt.Fprintf(b, " --%s/-%s\n", o.long, o.short)
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} else {
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_, _ = fmt.Fprintf(b, " --%[1]s=%[3]s/-%[2]s %[3]s\n", o.long, o.short, o.valueType)
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}
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}
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// processOptions decides if AdGuard Home should exit depending on the results
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// of command-line option parsing.
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func processOptions(
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opts *options,
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cmdName string,
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parseErr error,
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) (exitCode int, needExit bool) {
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if parseErr != nil {
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// Assume that usage has already been printed.
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return 2, true
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}
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if opts.help {
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usage(cmdName, os.Stdout)
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return 0, true
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}
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if opts.version {
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if opts.verbose {
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fmt.Println(version.Verbose())
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} else {
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fmt.Printf("AdGuard Home %s\n", version.Version())
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}
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return 0, true
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}
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return 0, false
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}
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Block a user