cli: factor options struct and parsing into home/options.go
This commit is contained in:
David Sheets
parent
8dc0108868
commit
03506df25d
109
home/home.go
109
home/home.go
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@ -526,108 +526,25 @@ func cleanupAlways() {
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log.Info("Stopped")
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}
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// command-line arguments
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type options struct {
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verbose bool // is verbose logging enabled
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configFilename string // path to the config file
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workDir string // path to the working directory where we will store the filters data and the querylog
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bindHost string // host address to bind HTTP server on
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bindPort int // port to serve HTTP pages on
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logFile string // Path to the log file. If empty, write to stdout. If "syslog", writes to syslog
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pidFile string // File name to save PID to
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checkConfig bool // Check configuration and exit
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disableUpdate bool // If set, don't check for updates
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// service control action (see service.ControlAction array + "status" command)
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serviceControlAction string
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// runningAsService flag is set to true when options are passed from the service runner
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runningAsService bool
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glinetMode bool // Activate GL-Inet mode
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func exitWithError() {
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os.Exit(64)
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}
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// loadOptions reads command line arguments and initializes configuration
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func loadOptions() options {
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o := options{}
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o, f, err := parse(os.Args[0], os.Args[1:])
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var printHelp func()
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var opts = []struct {
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longName string
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shortName string
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description string
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callbackWithValue func(value string)
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callbackNoValue func()
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}{
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{"config", "c", "Path to the config file", func(value string) { o.configFilename = value }, nil},
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{"work-dir", "w", "Path to the working directory", func(value string) { o.workDir = value }, nil},
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{"host", "h", "Host address to bind HTTP server on", func(value string) { o.bindHost = value }, nil},
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{"port", "p", "Port to serve HTTP pages on", func(value string) {
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v, err := strconv.Atoi(value)
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if err != nil {
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panic("Got port that is not a number")
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}
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o.bindPort = v
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}, nil},
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{"service", "s", "Service control action: status, install, uninstall, start, stop, restart, reload (configuration)", func(value string) {
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o.serviceControlAction = value
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}, nil},
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{"logfile", "l", "Path to log file. If empty: write to stdout; if 'syslog': write to system log", func(value string) {
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o.logFile = value
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}, nil},
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{"pidfile", "", "Path to a file where PID is stored", func(value string) { o.pidFile = value }, nil},
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{"check-config", "", "Check configuration and exit", nil, func() { o.checkConfig = true }},
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{"no-check-update", "", "Don't check for updates", nil, func() { o.disableUpdate = true }},
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{"verbose", "v", "Enable verbose output", nil, func() { o.verbose = true }},
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{"glinet", "", "Run in GL-Inet compatibility mode", nil, func() { o.glinetMode = true }},
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{"version", "", "Show the version and exit", nil, func() {
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fmt.Println(version())
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if err != nil {
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log.Error(err.Error())
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_ = printHelp(os.Args[0])
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exitWithError()
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} else if f != nil {
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err = f()
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if err != nil {
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log.Error(err.Error())
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exitWithError()
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} else {
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os.Exit(0)
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}},
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{"help", "", "Print this help", nil, func() {
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printHelp()
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os.Exit(64)
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}},
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}
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printHelp = func() {
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fmt.Printf("Usage:\n\n")
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fmt.Printf("%s [options]\n\n", os.Args[0])
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fmt.Printf("Options:\n")
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for _, opt := range opts {
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val := ""
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if opt.callbackWithValue != nil {
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val = " VALUE"
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}
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if opt.shortName != "" {
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fmt.Printf(" -%s, %-30s %s\n", opt.shortName, "--"+opt.longName+val, opt.description)
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} else {
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fmt.Printf(" %-34s %s\n", "--"+opt.longName+val, opt.description)
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}
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}
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}
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for i := 1; i < len(os.Args); i++ {
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v := os.Args[i]
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knownParam := false
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for _, opt := range opts {
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if v == "--"+opt.longName || (opt.shortName != "" && v == "-"+opt.shortName) {
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if opt.callbackWithValue != nil {
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if i+1 >= len(os.Args) {
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log.Error("Got %s without argument\n", v)
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os.Exit(64)
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}
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i++
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opt.callbackWithValue(os.Args[i])
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} else if opt.callbackNoValue != nil {
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opt.callbackNoValue()
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}
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knownParam = true
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break
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}
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}
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if !knownParam {
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log.Error("unknown option %v\n", v)
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printHelp()
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os.Exit(64)
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}
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}
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@ -0,0 +1,255 @@
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package home
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import (
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"fmt"
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"os"
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"strconv"
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)
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// options passed from command-line arguments
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type options struct {
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verbose bool // is verbose logging enabled
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configFilename string // path to the config file
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workDir string // path to the working directory where we will store the filters data and the querylog
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bindHost string // host address to bind HTTP server on
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bindPort int // port to serve HTTP pages on
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logFile string // Path to the log file. If empty, write to stdout. If "syslog", writes to syslog
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pidFile string // File name to save PID to
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checkConfig bool // Check configuration and exit
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disableUpdate bool // If set, don't check for updates
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// service control action (see service.ControlAction array + "status" command)
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serviceControlAction string
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// runningAsService flag is set to true when options are passed from the service runner
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runningAsService bool
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glinetMode bool // Activate GL-Inet mode
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}
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// functions used for their side-effects
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type effect func() error
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type arg struct {
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description string // a short, English description of the argument
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longName string // the name of the argument used after '--'
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shortName string // the name of the argument used after '-'
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// only one of updateWithValue, updateNoValue, and effect should be present
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updateWithValue func(o options, v string) (options, error) // the mutator for arguments with parameters
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updateNoValue func(o options) (options, error) // the mutator for arguments without parameters
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effect func(o options, exec string) (f effect, err error) // the side-effect closure generator
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}
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var args []arg
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var configArg = arg{
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"Path to the config file",
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"config", "c",
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func(o options, v string) (options, error) { o.configFilename = v; return o, nil },
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nil,
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nil,
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}
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var workDirArg = arg{
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"Path to the working directory",
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"work-dir", "w",
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func(o options, v string) (options, error) { o.workDir = v; return o, nil }, nil, nil,
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}
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var hostArg = arg{
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"Host address to bind HTTP server on",
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"host", "h",
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func(o options, v string) (options, error) { o.bindHost = v; return o, nil }, nil, nil,
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}
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var portArg = arg{
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"Port to serve HTTP pages on",
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"port", "p",
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func(o options, v string) (options, error) {
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var err error
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var p int
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minPort, maxPort := 0, 1<<16-1
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if p, err = strconv.Atoi(v); err != nil {
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err = fmt.Errorf("port '%s' is not a number", v)
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} else if p < minPort || p > maxPort {
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err = fmt.Errorf("port %d not in range %d - %d", p, minPort, maxPort)
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} else {
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o.bindPort = p
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}
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return o, err
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}, nil, nil,
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}
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var serviceArg = arg{
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"Service control action: status, install, uninstall, start, stop, restart, reload (configuration)",
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"service", "s",
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func(o options, v string) (options, error) {
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o.serviceControlAction = v
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return o, nil
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}, nil, nil,
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}
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var logfileArg = arg{
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"Path to log file. If empty: write to stdout; if 'syslog': write to system log",
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"logfile", "l",
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func(o options, v string) (options, error) { o.logFile = v; return o, nil }, nil, nil,
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}
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var pidfileArg = arg{
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"Path to a file where PID is stored",
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"pidfile", "",
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func(o options, v string) (options, error) { o.pidFile = v; return o, nil }, nil, nil,
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}
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var checkConfigArg = arg{
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"Check configuration and exit",
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"check-config", "",
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nil, func(o options) (options, error) { o.checkConfig = true; return o, nil }, nil,
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}
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var noCheckUpdateArg = arg{
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"Don't check for updates",
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"no-check-update", "",
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nil, func(o options) (options, error) { o.disableUpdate = true; return o, nil }, nil,
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}
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var verboseArg = arg{
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"Enable verbose output",
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"verbose", "v",
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nil, func(o options) (options, error) { o.verbose = true; return o, nil }, nil,
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}
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var glinetArg = arg{
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"Run in GL-Inet compatibility mode",
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"glinet", "",
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nil, func(o options) (options, error) { o.glinetMode = true; return o, nil }, nil,
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}
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var versionArg = arg{
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"Show the version and exit",
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"version", "",
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nil, nil, func(o options, exec string) (effect, error) {
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return func() error { fmt.Println(version()); os.Exit(0); return nil }, nil
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},
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}
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var helpArg = arg{
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"Print this help",
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"help", "",
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nil, nil, func(o options, exec string) (effect, error) {
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return func() error { _ = printHelp(exec); os.Exit(64); return nil }, nil
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},
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}
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func init() {
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args = []arg{
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configArg,
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workDirArg,
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hostArg,
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portArg,
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serviceArg,
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logfileArg,
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pidfileArg,
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checkConfigArg,
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noCheckUpdateArg,
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verboseArg,
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glinetArg,
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versionArg,
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helpArg,
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}
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}
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func getUsageLines(exec string, args []arg) []string {
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usage := []string{
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"Usage:",
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"",
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fmt.Sprintf("%s [options]", exec),
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"",
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"Options:",
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}
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for _, arg := range args {
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val := ""
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if arg.updateWithValue != nil {
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val = " VALUE"
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}
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if arg.shortName != "" {
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usage = append(usage, fmt.Sprintf(" -%s, %-30s %s",
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arg.shortName,
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"--"+arg.longName+val,
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arg.description))
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} else {
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usage = append(usage, fmt.Sprintf(" %-34s %s",
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"--"+arg.longName+val,
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arg.description))
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}
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}
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return usage
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}
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func printHelp(exec string) error {
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for _, line := range getUsageLines(exec, args) {
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_, err := fmt.Println(line)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func argMatches(a arg, v string) bool {
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return v == "--"+a.longName || (a.shortName != "" && v == "-"+a.shortName)
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}
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func parse(exec string, ss []string) (o options, f effect, err error) {
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for i := 0; i < len(ss); i++ {
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v := ss[i]
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knownParam := false
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for _, arg := range args {
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if argMatches(arg, v) {
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if arg.updateWithValue != nil {
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if i+1 >= len(ss) {
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return o, f, fmt.Errorf("got %s without argument", v)
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}
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i++
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o, err = arg.updateWithValue(o, ss[i])
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if err != nil {
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return
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}
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} else if arg.updateNoValue != nil {
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o, err = arg.updateNoValue(o)
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if err != nil {
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return
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}
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} else if arg.effect != nil {
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var eff effect
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eff, err = arg.effect(o, exec)
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if err != nil {
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return
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}
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if eff != nil {
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prevf := f
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f = func() error {
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var err error
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if prevf != nil {
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err = prevf()
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}
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if err == nil {
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err = eff()
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}
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return err
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}
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}
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}
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knownParam = true
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break
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}
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}
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if !knownParam {
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return o, f, fmt.Errorf("unknown option %v", v)
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}
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}
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return
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}
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@ -0,0 +1,171 @@
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package home
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import (
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"fmt"
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"testing"
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)
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func testParseOk(t *testing.T, ss ...string) options {
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o, _, err := parse("", ss)
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if err != nil {
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t.Fatal(err.Error())
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}
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return o
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}
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func testParseErr(t *testing.T, descr string, ss ...string) {
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_, _, err := parse("", ss)
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if err == nil {
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t.Fatalf("expected an error because %s but no error returned", descr)
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}
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}
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func testParseParamMissing(t *testing.T, param string) {
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testParseErr(t, fmt.Sprintf("%s parameter missing", param), param)
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}
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func TestParseVerbose(t *testing.T) {
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if testParseOk(t).verbose {
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t.Fatal("empty is not verbose")
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}
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if !testParseOk(t, "-v").verbose {
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t.Fatal("-v is verbose")
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}
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if !testParseOk(t, "--verbose").verbose {
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t.Fatal("--verbose is verbose")
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}
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}
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func TestParseConfigFilename(t *testing.T) {
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if testParseOk(t).configFilename != "" {
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t.Fatal("empty is no config filename")
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}
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if testParseOk(t, "-c", "path").configFilename != "path" {
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t.Fatal("-c is config filename")
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}
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testParseParamMissing(t, "-c")
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if testParseOk(t, "--config", "path").configFilename != "path" {
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t.Fatal("--configFilename is config filename")
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}
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testParseParamMissing(t, "--config")
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}
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func TestParseWorkDir(t *testing.T) {
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if testParseOk(t).workDir != "" {
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t.Fatal("empty is no work dir")
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}
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if testParseOk(t, "-w", "path").workDir != "path" {
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t.Fatal("-w is work dir")
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}
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testParseParamMissing(t, "-w")
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if testParseOk(t, "--work-dir", "path").workDir != "path" {
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t.Fatal("--work-dir is work dir")
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}
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testParseParamMissing(t, "--work-dir")
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}
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func TestParseBindHost(t *testing.T) {
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if testParseOk(t).bindHost != "" {
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t.Fatal("empty is no host")
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}
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if testParseOk(t, "-h", "addr").bindHost != "addr" {
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t.Fatal("-h is host")
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}
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testParseParamMissing(t, "-h")
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if testParseOk(t, "--host", "addr").bindHost != "addr" {
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t.Fatal("--host is host")
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}
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testParseParamMissing(t, "--host")
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}
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func TestParseBindPort(t *testing.T) {
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if testParseOk(t).bindPort != 0 {
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t.Fatal("empty is port 0")
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}
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if testParseOk(t, "-p", "65535").bindPort != 65535 {
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t.Fatal("-p is port")
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}
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testParseParamMissing(t, "-p")
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if testParseOk(t, "--port", "65535").bindPort != 65535 {
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t.Fatal("--port is port")
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}
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testParseParamMissing(t, "--port")
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}
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func TestParseBindPortBad(t *testing.T) {
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testParseErr(t, "not an int", "-p", "x")
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testParseErr(t, "hex not supported", "-p", "0x100")
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testParseErr(t, "port negative", "-p", "-1")
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testParseErr(t, "port too high", "-p", "65536")
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testParseErr(t, "port too high", "-p", "4294967297") // 2^32 + 1
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testParseErr(t, "port too high", "-p", "18446744073709551617") // 2^64 + 1
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}
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func TestParseLogfile(t *testing.T) {
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if testParseOk(t).logFile != "" {
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t.Fatal("empty is no log file")
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}
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if testParseOk(t, "-l", "path").logFile != "path" {
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t.Fatal("-l is log file")
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}
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if testParseOk(t, "--logfile", "path").logFile != "path" {
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t.Fatal("--logfile is log file")
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||||
}
|
||||
}
|
||||
|
||||
func TestParsePidfile(t *testing.T) {
|
||||
if testParseOk(t).pidFile != "" {
|
||||
t.Fatal("empty is no pid file")
|
||||
}
|
||||
if testParseOk(t, "--pidfile", "path").pidFile != "path" {
|
||||
t.Fatal("--pidfile is pid file")
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseCheckConfig(t *testing.T) {
|
||||
if testParseOk(t).checkConfig {
|
||||
t.Fatal("empty is not check config")
|
||||
}
|
||||
if !testParseOk(t, "--check-config").checkConfig {
|
||||
t.Fatal("--check-config is check config")
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseDisableUpdate(t *testing.T) {
|
||||
if testParseOk(t).disableUpdate {
|
||||
t.Fatal("empty is not disable update")
|
||||
}
|
||||
if !testParseOk(t, "--no-check-update").disableUpdate {
|
||||
t.Fatal("--no-check-update is disable update")
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseService(t *testing.T) {
|
||||
if testParseOk(t).serviceControlAction != "" {
|
||||
t.Fatal("empty is no service command")
|
||||
}
|
||||
if testParseOk(t, "-s", "command").serviceControlAction != "command" {
|
||||
t.Fatal("-s is service command")
|
||||
}
|
||||
if testParseOk(t, "--service", "command").serviceControlAction != "command" {
|
||||
t.Fatal("--service is service command")
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseGLInet(t *testing.T) {
|
||||
if testParseOk(t).glinetMode {
|
||||
t.Fatal("empty is not GL-Inet mode")
|
||||
}
|
||||
if !testParseOk(t, "--glinet").glinetMode {
|
||||
t.Fatal("--glinet is GL-Inet mode")
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseUnknown(t *testing.T) {
|
||||
testParseErr(t, "unknown word", "x")
|
||||
testParseErr(t, "unknown short", "-x")
|
||||
testParseErr(t, "unknown long", "--x")
|
||||
testParseErr(t, "unknown triple", "---x")
|
||||
testParseErr(t, "unknown plus", "+x")
|
||||
testParseErr(t, "unknown dash", "-")
|
||||
}
|
||||
Loading…
Reference in New Issue