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|
package server
import (
"tunnel/pkg/config"
"strings"
"bytes"
"sync"
"time"
"fmt"
"log"
"net"
"io"
)
type Server struct {
listen net.Listener
since time.Time
wg sync.WaitGroup
once sync.Once
done chan struct{}
env env
nextCid uint64
}
type client struct {
id uint64
s *Server
conn net.Conn
nextRid uint64
}
type request struct {
id uint64
c *client
cmd *cmd
argc int
args []string
out *bytes.Buffer
}
func (c *client) String() string {
return fmt.Sprintf("client(%d)", c.id)
}
func (r *request) String() string {
return fmt.Sprintf("request(%d)", r.id)
}
func (r *request) Print(v ...interface{}) {
fmt.Fprint(r.out, v...)
}
func (r *request) Printf(format string, v ...interface{}) {
fmt.Fprintf(r.out, format, v...)
}
func (r *request) Println(v ...interface{}) {
fmt.Fprintln(r.out, v...)
}
func (r *request) Fatal(v ...interface{}) {
panic(fmt.Sprint(v...))
}
func (r *request) Fatalf(format string, v ...interface{}) {
panic(fmt.Sprintf(format, v...))
}
func (r *request) Fatalln(v ...interface{}) {
panic(fmt.Sprintln(v...))
}
func (r *request) expect(c ...int) {
desc := func (n int) string {
var sep string
if n == 1 {
sep = " is "
} else {
sep = " are "
}
return fmt.Sprint(n, sep, "expected")
}
check := func (cond bool, args ...interface{}) {
if cond {
r.Fatal(args...)
}
}
switch len(c) {
case 0:
check(r.argc > 0, "args are not expected")
case 1:
check(r.argc < c[0], "not enough args: ", desc(c[0]))
check(r.argc > c[0], "too many args: ", desc(c[0]))
case 2:
check(r.argc < c[0], "not enough args: at least ", desc(c[0]))
check(r.argc > c[1], "too many args: no more than ", desc(c[1]))
}
}
func (s *Server) isDone() bool {
select {
case <- s.done:
return true
default:
return false
}
}
func New() (*Server, error) {
listen, err := net.Listen(config.SockType, config.SockPath)
if err != nil {
return nil, err
}
s := &Server{
listen: listen,
since: time.Now(),
done: make(chan struct{}),
}
return s, nil
}
func (s *Server) Run() {
for {
conn, err := s.listen.Accept()
if err != nil {
if s.isDone() {
break
}
log.Print(err)
continue
}
c := s.newClient(conn)
log.Println(c, "accept")
s.wg.Add(1)
go c.handle()
}
s.wg.Wait()
}
func (s *Server) Stop() {
s.once.Do(func () {
close(s.done)
s.listen.Close()
})
}
func (s *Server) newClient(conn net.Conn) *client {
c := &client{
s: s,
conn: conn,
id: s.nextCid,
}
s.nextCid++
return c
}
func (c *client) newRequest() *request {
r := &request{
c: c,
id: c.nextRid,
out: bytes.NewBuffer(nil),
}
c.nextRid++
return r
}
func (c *client) handle() {
defer c.close()
buf := make([]byte, config.BufSize)
for {
nr, er := c.conn.Read(buf)
if er != nil {
if er != io.EOF {
log.Println(c, "handle:", er)
}
break
}
query := string(buf[:nr])
r := c.newRequest()
if r.parse(query) {
r.run()
}
if r.out.Len() == 0 {
r.out.Write([]byte("\n"))
}
_, ew := c.conn.Write(r.out.Bytes())
if ew != nil {
log.Println(c, "handle:", ew)
break
}
}
}
func (r *request) parse(query string) bool {
c, args := getCmd(strings.Split(query, " "))
if c == nil {
r.Print("unknown command")
return false
}
r.args = args
r.argc = len(args)
r.cmd = c
return true
}
func (r *request) run() {
log.Printf("%s %s run [%s] '%s'", r.c, r, r.cmd.name, strings.Join(r.args, " "))
defer func () {
if e := recover(); e != nil {
r.Print(e)
}
}()
r.cmd.f(r)
}
func (c *client) close() {
log.Println(c, "close")
c.conn.Close()
c.s.wg.Done()
}
|
