/
kernel.go
146 lines (122 loc) · 3.05 KB
/
kernel.go
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package gowl
import (
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"sort"
"strings"
"sync"
"github.com/lokhman/gowl/console"
)
const (
ServerName = "gowl/1.0"
)
const (
Development = "dev"
Staging = "staging"
Production = "prod"
)
var kernel struct {
servers sync.Map
commands sync.Map
}
var execPath string
var (
_env = flag.String("env", Production, "set executable environment")
_debug = flag.Bool("debug", false, "enable debug mode")
_quiet = flag.Bool("quiet", false, "quiet mode")
_server = flag.String("server", "", "filter by server address")
)
var (
stdout io.Writer = os.Stdout
stderr io.Writer = os.Stderr
)
var (
Debug = log.New(stdout, "[gowl] ", log.LstdFlags)
Error = log.New(stderr, "[gowl] ", log.LstdFlags|log.Lshortfile)
)
func init() {
var exec string
if fn, err := os.Executable(); err == nil {
execPath, exec = filepath.Split(fn)
}
flag.Usage = func() {
out := flag.CommandLine.Output()
fmt.Fprintf(out, "Usage: %s [flags] <command>", exec)
fmt.Fprintln(out, "\n\nThe commands are:")
commands := make([]string, 0)
kernel.commands.Range(func(_, command interface{}) bool {
c := command.(console.CommandInterface)
help := strings.Replace(c.Help(), "\n", "\n \t", -1)
commands = append(commands, " "+c.Name()+"\n \t"+help)
return true
})
sort.Strings(commands)
fmt.Fprint(out, strings.Join(commands, "\n"))
fmt.Fprintln(out, "\n\nThe flags are:")
flag.PrintDefaults()
}
RegisterCommand(console.NewCommand("run", "run registered servers", runCommand))
RegisterCommand(console.NewCommand("info", "display information about registered servers", infoCommand))
}
func ExecPath() string {
return execPath
}
func EnvMode() string {
return *_env
}
func DebugMode() bool {
return *_debug
}
func RegisterCommand(command console.CommandInterface) {
name := command.Name()
if _, ok := kernel.commands.Load(name); ok {
panic(fmt.Sprintf(`gowl: command "%s" is already registered`, name))
}
kernel.commands.Store(name, command)
}
func RegisterServer(server ServerInterface) {
addr := server.Config().Addr
if _, ok := kernel.servers.Load(addr); ok {
panic(fmt.Sprintf(`gowl: server with address "%s" is already registered`, addr))
}
kernel.servers.Store(addr, server)
}
func Run(server ...ServerInterface) {
flag.Parse()
if *_quiet {
stdout = ioutil.Discard
stderr = ioutil.Discard
}
for _, server := range server {
RegisterServer(server)
}
if name := flag.Arg(0); name != "" {
out := console.NewOutput(stdout, stderr)
getCommand(name).Execute(out)
return
}
flag.Usage()
}
func getServer(addr string) ServerInterface {
server, ok := kernel.servers.Load(addr)
if !ok {
fatal(`Server "%s" is not registered`, addr)
}
return server.(ServerInterface)
}
func getCommand(name string) console.CommandInterface {
command, ok := kernel.commands.Load(name)
if !ok {
fatal(`Command "%s" is not registered`, name)
}
return command.(console.CommandInterface)
}
func fatal(format string, a ...interface{}) {
fmt.Fprintln(stderr, fmt.Sprintf(format, a...))
os.Exit(1)
}