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|
package main
import (
"flag"
"fmt"
"github.com/4ad/doozer"
"os"
"reflect"
"sort"
"strconv"
)
var (
uri = flag.String("a", "doozer:?ca=127.0.0.1:8046", "the address to bind to")
buri = flag.String("b", "", "the DzNS uri")
rrev = flag.Int64("r", -1, "request rev")
showHelp = flag.Bool("h", false, "show help")
showVersion = flag.Bool("v", false, "print version string")
)
type cmd struct {
f interface{}
a string // args
d string // short description
}
var (
selfName = os.Args[0]
cmds = map[string]cmd{}
cmdHelp = map[string]string{}
)
const (
usage1 = `
Each command takes zero or more options and zero or more arguments.
In addition, there are some global options that can be used with any command.
The exit status is 0 on success, 1 for a rev mismatch, and 2 otherwise.
Global Options:
`
usage2 = `Environment:
DOOZER_URI - The doozer cluster to bind to; overridden by -a.
DOOZER_BOOT_URI - The DzNS to lookup address in; overridden by -b.
Commands:
`
)
func usage() {
fmt.Fprintf(os.Stderr, "Use: %s [options] <command> [options] [args]\n", selfName)
fmt.Fprint(os.Stderr, usage1)
flag.PrintDefaults()
fmt.Fprintln(os.Stderr)
fmt.Fprint(os.Stderr, usage2)
var max int
var names []string
us := make(map[string]string)
for k := range cmds {
u := k + " " + cmds[k].a
if len(u) > max {
max = len(u)
}
names = append(names, k)
us[k] = u
}
sort.Strings(names)
for _, k := range names {
fmt.Fprintf(os.Stderr, " %-*s - %s\n", max, us[k], cmds[k].d)
}
}
func bail(e error) {
fmt.Fprintln(os.Stderr, "Error:", e)
if e == doozer.ErrOldRev {
os.Exit(1)
}
os.Exit(2)
}
func mustAtoi64(arg string) int64 {
n, err := strconv.ParseInt(arg, 10, 64)
if err != nil {
bail(err)
}
return n
}
func dial() *doozer.Conn {
c, err := doozer.DialUri(*uri, *buri)
if err != nil {
bail(err)
}
return c
}
func main() {
if e := os.Getenv("DOOZER_URI"); e != "" {
*uri = e
}
if e := os.Getenv("DOOZER_BOOT_URI"); e != "" {
*buri = e
}
flag.Usage = usage
flag.Parse()
if *showHelp {
usage()
return
}
if *showVersion {
fmt.Println("doozer", version)
return
}
if flag.NArg() < 1 {
fmt.Fprintf(os.Stderr, "%s: missing command\n", os.Args[0])
usage()
os.Exit(127)
}
cmd := flag.Arg(0)
c, ok := cmds[cmd]
if !ok {
fmt.Fprintln(os.Stderr, "Unknown command:", cmd)
usage()
os.Exit(127)
}
os.Args = flag.Args()
flag.Parse()
if *showHelp {
help(cmd)
return
}
args := flag.Args()
ft := reflect.TypeOf(c.f)
if len(args) != ft.NumIn() {
fmt.Fprintf(os.Stderr, "%s: wrong number of arguments\n", cmd)
help(cmd)
os.Exit(127)
}
vals := make([]reflect.Value, len(args))
for i, s := range args {
vals[i] = reflect.ValueOf(s)
}
fv := reflect.ValueOf(c.f)
fv.Call(vals)
}
|
