feat: remove urfave/cli

README.md

@@ -2,3 +2,5 @@
 
 _Command-line DNS client written in Golang_
 
+# WIP
+

TODO.md

@@ -10,6 +10,7 @@
 - [x] Add DOH support
 - [x] Add DOT support
 - [x] Add DNS protocol on TCP mode support.
+- [ ] Error on NXDomain (Realted upstream [bug](https://github.com/miekg/dns/issues/1198))
 
 ## CLI Features
 - [ ] `digfile`
@@ -18,6 +19,8 @@
 - [x] JSON output
 - [x] Colorized output
 - [x] Table output
+- [ ] Parsing options free-form
+- [x] Remove urfave/cli in favour of `flag`
 
 ## CLI Grunt
 - [x] Query args
@@ -31,8 +34,8 @@
 ## Documentation
 
 ## Release Checklist
-- [ ] Add packages to all package managers
+- [ ] Goreleaser
-- [ ] Snap
+  - [ ] Snap
-- [ ] Homebrew
+  - [ ] Homebrew
-- [ ] Alpine Linux
+  - [ ] ARM
-- [ ] ARM support too
+

cmd/cli.go

@@ -1,129 +1,76 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
-	"github.com/urfave/cli/v2"
+	"github.com/knadh/koanf"
+	"github.com/knadh/koanf/providers/posflag"
+	flag "github.com/spf13/pflag"
 )
 
 var (
 	// Version and date of the build. This is injected at build-time.
 	buildVersion = "unknown"
 	buildDate    = "unknown"
+	k            = koanf.New(".")
 )
 
 func main() {
 	var (
 		logger = initLogger()
-		app    = cli.NewApp()
 	)
+
 	// Initialize hub.
 	hub := NewHub(logger, buildVersion)
 
-	// Configure CLI app.
+	// Configure Flags
-	app.Name = "doggo"
+	// Use the POSIX compliant pflag lib instead of Go's flag lib.
-	app.Usage = "Command-line DNS Client"
+	f := flag.NewFlagSet("config", flag.ContinueOnError)
-	app.Version = buildVersion
+	f.Usage = func() {
+		fmt.Println(f.FlagUsages())
+		os.Exit(0)
+	}
+	// Path to one or more config files to load into koanf along with some config params.
+	f.StringSliceP("query", "q", []string{}, "Domain name to query")
+	f.StringSliceP("type", "t", []string{}, "Type of DNS record to be queried (A, AAAA, MX etc)")
+	f.StringSliceP("class", "c", []string{}, "Network class of the DNS record to be queried (IN, CH, HS etc)")
+	f.StringSliceP("nameservers", "n", []string{}, "Address of the nameserver to send packets to")
 
-	// Register command line flags.
+	// Protocol Options
-	app.Flags = []cli.Flag{
+	f.BoolP("udp", "U", false, "Use the DNS protocol over UDP")
-		&cli.StringSliceFlag{
+	f.BoolP("tcp", "T", false, "Use the DNS protocol over TCP")
-			Name:        "query",
+	f.BoolP("doh", "H", false, "Use the DNS-over-HTTPS protocol")
-			Usage:       "Domain name to query",
+	f.BoolP("dot", "S", false, "Use the DNS-over-TLS")
-			Destination: hub.QueryFlags.QNames,
+
-		},
+	// Resolver Options
-		&cli.StringSliceFlag{
+	f.Bool("search", false, "Use the search list provided in resolv.conf. It sets the `ndots` parameter as well unless overriden by `ndots` flag.")
-			Name:        "type",
+	f.Int("ndots", 1, "Specify the ndots paramter")
-			Usage:       "Type of DNS record to be queried (A, AAAA, MX etc)",
+
-			Destination: hub.QueryFlags.QTypes,
+	// Output Options
-		},
+	f.BoolP("json", "J", false, "Set the output format as JSON")
-		&cli.StringSliceFlag{
+	f.Bool("time", false, "Display how long it took for the response to arrive")
-			Name:        "nameserver",
+	f.Bool("debug", false, "Enable debug mode")
-			Usage:       "Address of the nameserver to send packets to",
+
-			Destination: hub.QueryFlags.Nameservers,
+	// Parse and Load Flags
-		},
+	f.Parse(os.Args[1:])
-		&cli.StringSliceFlag{
+	if err := k.Load(posflag.Provider(f, ".", k), nil); err != nil {
-			Name:        "class",
+		hub.Logger.Fatalf("error loading flags: %v", err)
-			Usage:       "Network class of the DNS record to be queried (IN, CH, HS etc)",
+		fmt.Println(f.FlagUsages())
-			Destination: hub.QueryFlags.QClasses,
+		os.Exit(0)
-		},
-		&cli.BoolFlag{
-			Name:    "udp",
-			Usage:   "Use the DNS protocol over UDP",
-			Aliases: []string{"U"},
-		},
-		&cli.BoolFlag{
-			Name:        "tcp",
-			Usage:       "Use the DNS protocol over TCP",
-			Aliases:     []string{"T"},
-			Destination: &hub.QueryFlags.UseTCP,
-		},
-		&cli.BoolFlag{
-			Name:        "https",
-			Usage:       "Use the DNS-over-HTTPS protocol",
-			Aliases:     []string{"H"},
-			Destination: &hub.QueryFlags.IsDOH,
-		},
-		&cli.BoolFlag{
-			Name:        "tls",
-			Usage:       "Use the DNS-over-TLS",
-			Aliases:     []string{"S"},
-			Destination: &hub.QueryFlags.IsDOT,
-		},
-		&cli.BoolFlag{
-			Name:        "ipv6",
-			Aliases:     []string{"6"},
-			Usage:       "Use IPv6 only",
-			Destination: &hub.QueryFlags.UseIPv6,
-		},
-		&cli.BoolFlag{
-			Name:        "ipv4",
-			Aliases:     []string{"4"},
-			Usage:       "Use IPv4 only",
-			Destination: &hub.QueryFlags.UseIPv4,
-		},
-		&cli.BoolFlag{
-			Name:        "time",
-			Usage:       "Display how long it took for the response to arrive",
-			Destination: &hub.QueryFlags.DisplayTimeTaken,
-		},
-		&cli.BoolFlag{
-			Name:        "search",
-			Usage:       "Use the search list provided in resolv.conf. It sets the `ndots` parameter as well unless overriden by `ndots` flag.",
-			Destination: &hub.QueryFlags.UseSearchList,
-		},
-		&cli.IntFlag{
-			Name:        "ndots",
-			Usage:       "Specify the ndots paramter",
-			DefaultText: "Default value is that set in `/etc/resolv.conf` or 1 if no `ndots` statement is present.",
-			Destination: &hub.QueryFlags.Ndots,
-		},
-		&cli.BoolFlag{
-			Name:        "json",
-			Aliases:     []string{"J"},
-			Usage:       "Set the output format as JSON",
-			Destination: &hub.QueryFlags.ShowJSON,
-		},
-		&cli.BoolFlag{
-			Name:        "debug",
-			Usage:       "Enable verbose logging",
-			Destination: &hub.QueryFlags.Verbose,
-			DefaultText: "false",
-		},
-	}
-	app.Before = hub.loadQueryArgs
-	app.Action = func(c *cli.Context) error {
-		if len(hub.QueryFlags.QNames.Value()) == 0 {
-			cli.ShowAppHelpAndExit(c, 0)
-		}
-		hub.Lookup(c)
-		return nil
 	}
 
 	// Run the app.
 	hub.Logger.Debug("Starting doggo...")
-	err := app.Run(os.Args)
+
-	if err != nil {
+	// Parse Query Args
-		logger.Errorf("oops! we encountered an issue: %s", err)
+	hub.loadQueryArgs()
+
+	// Start App
+	if len(hub.QueryFlags.QNames) == 0 {
+		fmt.Println(f.FlagUsages())
+		os.Exit(0)
 	}
+	hub.Lookup()
+
 }

cmd/help.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"io"
+)
+
+// Override Help Template
+var helpTmpl = `NAME:
+   {{.Name}}
+   {{ range $key, $value := . }}
+   <li><strong>{{ $key }}</strong>: {{ $value }}</li>
+{{ end }}
+`
+
+func renderCustomHelp(w io.Writer, templ string, data interface{}) {
+	var helpTmplVars = map[string]string{}
+
+	helpTmplVars["Name"] = "doggo"
+	fmt.Fprintf(w, helpTmpl, helpTmplVars)
+}

cmd/hub.go

@@ -4,7 +4,6 @@ import (
 	"github.com/miekg/dns"
 	"github.com/mr-karan/doggo/pkg/resolvers"
 	"github.com/sirupsen/logrus"
-	"github.com/urfave/cli/v2"
 )
 
 // Hub represents the structure for all app wide functions and structs.
@@ -14,26 +13,24 @@ type Hub struct {
 	QueryFlags QueryFlags
 	Questions  []dns.Question
 	Resolver   resolvers.Resolver
-	cliContext *cli.Context
 }
 
 // QueryFlags is used store the value of CLI flags.
 type QueryFlags struct {
-	QNames           *cli.StringSlice
+	QNames           []string `koanf:"query"`
-	QTypes           *cli.StringSlice
+	QTypes           []string `koanf:"type"`
-	QClasses         *cli.StringSlice
+	QClasses         []string `koanf:"class"`
-	Nameservers      *cli.StringSlice
+	Nameservers      []string `koanf:"namserver"`
-	IsDOH            bool
+	IsDOH            bool     `koanf:"doh"`
-	IsDOT            bool
+	IsDOT            bool     `koanf:"dot"`
-	IsUDP            bool
+	IsUDP            bool     `koanf:"udp"`
-	UseTCP           bool
+	UseTCP           bool     `koanf:"tcp"`
-	UseIPv4          bool
+	UseIPv4          bool     `koanf:"ipv4"`
-	UseIPv6          bool
+	UseIPv6          bool     `koanf:"ipv6"`
-	DisplayTimeTaken bool
+	DisplayTimeTaken bool     `koanf:"time"`
-	ShowJSON         bool
+	ShowJSON         bool     `koanf:"json"`
-	Verbose          bool
+	UseSearchList    bool     `koanf:"search"`
-	UseSearchList    bool
+	Ndots            int      `koanf:"ndots"`
-	Ndots            int
 }
 
 // NewHub initializes an instance of Hub which holds app wide configuration.
@@ -43,10 +40,10 @@ func NewHub(logger *logrus.Logger, buildVersion string) *Hub {
 		Logger:  logger,
 		Version: buildVersion,
 		QueryFlags: QueryFlags{
-			QNames:      cli.NewStringSlice(),
+			QNames:      []string{},
-			QTypes:      cli.NewStringSlice(),
+			QTypes:      []string{},
-			QClasses:    cli.NewStringSlice(),
+			QClasses:    []string{},
-			Nameservers: cli.NewStringSlice(),
+			Nameservers: []string{},
 		},
 	}
 	return hub

cmd/lookup.go

@@ -6,11 +6,10 @@ import (
 	"github.com/miekg/dns"
 	"github.com/mr-karan/doggo/pkg/resolvers"
 	"github.com/sirupsen/logrus"
-	"github.com/urfave/cli/v2"
 )
 
 // Lookup sends the DNS queries to the server.
-func (hub *Hub) Lookup(c *cli.Context) error {
+func (hub *Hub) Lookup() error {
 	err := hub.prepareQuestions()
 	if err != nil {
 		return err
@@ -30,16 +29,17 @@ func (hub *Hub) prepareQuestions() error {
 	var (
 		question dns.Question
 	)
-	for _, name := range hub.QueryFlags.QNames.Value() {
+	for _, name := range hub.QueryFlags.QNames {
 		var (
 			domains []string
 			ndots   int
 		)
+		ndots = 1
 
 		// If `search` flag is specified then fetch the search list
 		// from `resolv.conf` and set the
 		if hub.QueryFlags.UseSearchList {
-			list, n, err := fetchDomainList(name, hub.cliContext.IsSet("ndots"), hub.QueryFlags.Ndots)
+			list, n, err := fetchDomainList(name, false, hub.QueryFlags.Ndots)
 			if err != nil {
 				return err
 			}
@@ -55,10 +55,10 @@ func (hub *Hub) prepareQuestions() error {
 			}).Debug("Attmepting to resolve")
 			question.Name = d
 			// iterate on a list of query types.
-			for _, q := range hub.QueryFlags.QTypes.Value() {
+			for _, q := range hub.QueryFlags.QTypes {
 				question.Qtype = dns.StringToType[strings.ToUpper(q)]
 				// iterate on a list of query classes.
-				for _, c := range hub.QueryFlags.QClasses.Value() {
+				for _, c := range hub.QueryFlags.QClasses {
 					question.Qclass = dns.StringToClass[strings.ToUpper(c)]
 					// append a new question for each possible pair.
 					hub.Questions = append(hub.Questions, question)

cmd/parse.go

@@ -1,32 +1,35 @@
 package main
 
 import (
+	"os"
 	"strings"
 
 	"github.com/miekg/dns"
 	"github.com/sirupsen/logrus"
-	"github.com/urfave/cli/v2"
 )
 
-func (hub *Hub) loadQueryArgs(c *cli.Context) error {
+func (hub *Hub) loadQueryArgs() error {
 	// set log level
-	if c.Bool("debug") {
+	if k.Bool("debug") {
 		// Set logger level
 		hub.Logger.SetLevel(logrus.DebugLevel)
 	} else {
 		hub.Logger.SetLevel(logrus.InfoLevel)
 	}
-	hub.cliContext = c
 
-	err := hub.loadFreeArgs(c)
+	err := hub.loadNamedArgs()
+
+	err = hub.loadFreeArgs()
 	if err != nil {
-		cli.Exit("Error parsing arguments", -1)
+		hub.Logger.WithError(err).Error("Error parsing arguments")
+		hub.Logger.Exit(2)
 	}
-	err = hub.initResolver(c)
+	err = hub.initResolver()
 	if err != nil {
-		cli.Exit("Error parsing nameservers", -1)
+		hub.Logger.WithError(err).Error("Error parsing nameservers")
+		hub.Logger.Exit(2)
 	}
-	hub.loadFallbacks(c)
+	hub.loadFallbacks()
 	return err
 }
 
@@ -37,29 +40,44 @@ func (hub *Hub) loadQueryArgs(c *cli.Context) error {
 // pattern we deduce the arguments and map it to internal query
 // options. In case an argument isn't able to fit in any of the existing
 // pattern it is considered to be a "query name".
-func (hub *Hub) loadFreeArgs(c *cli.Context) error {
+func (hub *Hub) loadFreeArgs() error {
-	for _, arg := range c.Args().Slice() {
+	args := os.Args[1:]
+	for _, arg := range args {
+		if strings.HasPrefix(arg, "--") || strings.HasPrefix(arg, "-") {
+			continue
+		}
 		if strings.HasPrefix(arg, "@") {
-			hub.QueryFlags.Nameservers.Set(strings.Trim(arg, "@"))
+			hub.QueryFlags.Nameservers = append(hub.QueryFlags.Nameservers, strings.Trim(arg, "@"))
 		} else if _, ok := dns.StringToType[strings.ToUpper(arg)]; ok {
-			hub.QueryFlags.QTypes.Set(arg)
+			hub.QueryFlags.QTypes = append(hub.QueryFlags.QTypes, arg)
 		} else if _, ok := dns.StringToClass[strings.ToUpper(arg)]; ok {
-			hub.QueryFlags.QClasses.Set(arg)
+			hub.QueryFlags.QClasses = append(hub.QueryFlags.QClasses, arg)
 		} else {
 			// if nothing matches, consider it's a query name.
-			hub.QueryFlags.QNames.Set(arg)
+			hub.QueryFlags.QNames = append(hub.QueryFlags.QNames, arg)
 		}
 	}
 	return nil
 }
 
+// loadNamedArgs checks for all flags and loads their
+// values inside the Hub.
+func (hub *Hub) loadNamedArgs() error {
+	// Unmarshall flags to the struct.
+	err := k.Unmarshal("", &hub.QueryFlags)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 // loadFallbacks sets fallbacks for options
 // that are not specified by the user.
-func (hub *Hub) loadFallbacks(c *cli.Context) {
+func (hub *Hub) loadFallbacks() {
-	if len(hub.QueryFlags.QTypes.Value()) == 0 {
+	if len(hub.QueryFlags.QTypes) == 0 {
-		hub.QueryFlags.QTypes.Set("A")
+		hub.QueryFlags.QTypes = append(hub.QueryFlags.QTypes, "A")
 	}
-	if len(hub.QueryFlags.QClasses.Value()) == 0 {
+	if len(hub.QueryFlags.QClasses) == 0 {
-		hub.QueryFlags.QClasses.Set("IN")
+		hub.QueryFlags.QClasses = append(hub.QueryFlags.QClasses, "IN")
 	}
 }

cmd/resolver.go

@@ -4,22 +4,21 @@ import (
 	"runtime"
 
 	"github.com/mr-karan/doggo/pkg/resolvers"
-	"github.com/urfave/cli/v2"
 )
 
 // initResolver checks for various flags and initialises
 // the correct resolver based on the config.
-func (hub *Hub) initResolver(c *cli.Context) error {
+func (hub *Hub) initResolver() error {
 	// check if DOH flag is set.
 	if hub.QueryFlags.IsDOH {
-		rslvr, err := resolvers.NewDOHResolver(hub.QueryFlags.Nameservers.Value())
+		rslvr, err := resolvers.NewDOHResolver(hub.QueryFlags.Nameservers)
 		if err != nil {
 			return err
 		}
 		hub.Resolver = rslvr
 		return nil
 	}
-	if len(hub.QueryFlags.Nameservers.Value()) == 0 {
+	if len(hub.QueryFlags.Nameservers) == 0 {
 		if runtime.GOOS == "windows" {
 			// TODO: Add a method for reading system default nameserver in windows.
 		} else {
@@ -31,7 +30,7 @@ func (hub *Hub) initResolver(c *cli.Context) error {
 			return nil
 		}
 	} else {
-		rslvr, err := resolvers.NewClassicResolver(hub.QueryFlags.Nameservers.Value(), resolvers.ClassicResolverOpts{
+		rslvr, err := resolvers.NewClassicResolver(hub.QueryFlags.Nameservers, resolvers.ClassicResolverOpts{
 			UseIPv4: hub.QueryFlags.UseIPv4,
 			UseIPv6: hub.QueryFlags.UseIPv6,
 			UseTLS:  hub.QueryFlags.IsDOT,

go.mod

@@ -4,10 +4,11 @@ go 1.15
 
 require (
 	github.com/fatih/color v1.10.0
-	github.com/mattn/go-runewidth v0.0.9
+	github.com/knadh/koanf v0.14.0
+	github.com/mattn/go-runewidth v0.0.9 // indirect
 	github.com/miekg/dns v1.1.35
 	github.com/olekukonko/tablewriter v0.0.4
-	github.com/rodaine/table v1.0.1
 	github.com/sirupsen/logrus v1.7.0
-	github.com/urfave/cli/v2 v2.3.0
+	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.6.1 // indirect
 )

go.sum

@@ -1,11 +1,19 @@
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/color v1.10.0 h1:s36xzo75JdqLaaWoiEHk767eHiwo0598uUxyfiPkDsg=
 github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
+github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
+github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
+github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
+github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
+github.com/knadh/koanf v0.14.0 h1:h9XeG4wEiEuxdxqv/SbY7TEK+7vzrg/dOaGB+S6+mPo=
+github.com/knadh/koanf v0.14.0/go.mod h1:H5mEFsTeWizwFXHKtsITL5ipsLTuAMQoGuQpp+1JL9U=
 github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
 github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
@@ -15,24 +23,25 @@ github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/Qd
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/miekg/dns v1.1.35 h1:oTfOaDH+mZkdcgdIjH6yBajRGtIwcwcaR+rt23ZSrJs=
 github.com/miekg/dns v1.1.35/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
+github.com/mitchellh/mapstructure v1.2.2 h1:dxe5oCinTXiTIcfgmZecdCzPmAJKd46KsCWc35r0TV4=
+github.com/mitchellh/mapstructure v1.2.2/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/olekukonko/tablewriter v0.0.4 h1:vHD/YYe1Wolo78koG299f7V/VAS08c6IpCLn+Ejf/w8=
 github.com/olekukonko/tablewriter v0.0.4/go.mod h1:zq6QwlOf5SlnkVbMSr5EoBv3636FWnp+qbPhuoO21uA=
+github.com/pelletier/go-toml v1.7.0 h1:7utD74fnzVc/cpcyy8sjrlFr5vYpypUixARcHIMIGuI=
+github.com/pelletier/go-toml v1.7.0/go.mod h1:vwGMzjaWMwyfHwgIBhI2YUM4fB6nL6lVAvS1LBMMhTE=
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