wip

evio.go

@@ -32,40 +32,48 @@ type Options struct {
 	TCPKeepAlive time.Duration
 }
 
-// Addr represents the connection's remote and local addresses.
+// Conn represents a connection context which provides information
-type Addr struct {
+// about the connection.
-	// Index is the index of server address that was passed to the Serve call.
+type Conn struct {
-	Index int
+	// Closing is true when the connection is about to close. Expect a Closed
-	// Local is the connection's local socket address.
+	// event to fire soon.
-	Local net.Addr
+	Closing bool
-	// Local is the connection's remote peer address.
+	// AddrIndex is the index of server address that was passed to the Serve call.
-	Remote net.Addr
+	AddrIndex int
+	// LocalAddr is the connection's local socket address.
+	LocalAddr net.Addr
+	// RemoteAddr is the connection's remote peer address.
+	RemoteAddr net.Addr
 }
 
-// Context represents a server context which provides information about the
+// Server represents a server context which provides information about the
 // running server and has control functions for managing some state
-type Context struct {
+type Server struct {
-	Addrs  []net.Addr
+	// The addrs parameter is an array of listening addresses that align
-	Wake   func(id int) bool
+	// with the addr strings passed to the Serve function.
-	Attach func(v interface{}) error
+	Addrs []net.Addr
+	// Wake is a goroutine-safe function that triggers a Data event
+	// (with a nil `in` parameter) for the specified id.
+	Wake func(id int) bool
+	// Dial makes a connection to an external server and returns a new
+	// connection id. The new connection is added to the event loop and
+	// is managed exactly the same way as all the other connections.
+	Dial func(addr string, timeout time.Duration) (id int, err error)
 }
 
 // Events represents the server events for the Serve call.
 // Each event has an Action return value that is used manage the state
 // of the connection and server.
 type Events struct {
-	// Serving fires when the server can accept connections.
+	// Serving fires when the server can accept connections. The context
-	// The wake parameter is a goroutine-safe function that triggers
+	// parameter has various utilities that may help with managing the
-	// a Data event (with a nil `in` parameter) for the specified id.
+	// event loop.
-	// The addrs parameter is an array of listening addresses that align
+	Serving func(s Server) (action Action)
-	// with the addr strings passed to the Serve function.
-	Serving func(c Context) (action Action)
 	// Opened fires when a new connection has opened.
 	// The addr parameter is the connection's local and remote addresses.
 	// Use the out return value to write data to the connection.
 	// The opts return value is used to set connection options.
-	Opened   func(id int, addr Addr) (out []byte, opts Options, action Action)
+	Opened func(id int, c Conn) (out []byte, opts Options, action Action)
-	Attached func(id int, v interface{}) (out []byte, opts Options, action Action)
 	// Closed fires when a connection has closed.
 	// The err parameter is the last known connection error, usually nil.
 	Closed func(id int, err error) (action Action)
@@ -116,14 +124,11 @@ func Serve(events Events, addr ...string) error {
 	}()
 	var stdlib bool
 	for _, addr := range addr {
-		ln := listener{network: "tcp", addr: addr}
+		var ln listener
-		if strings.Contains(addr, "://") {
+		var stdlibt bool
-			ln.network = strings.Split(addr, "://")[0]
+		ln.network, ln.addr, stdlibt = parseAddr(addr)
-			ln.addr = strings.Split(addr, "://")[1]
+		if stdlibt {
-		}
-		if strings.HasSuffix(ln.network, "-net") {
 			stdlib = true
-			ln.network = ln.network[:len(ln.network)-4]
 		}
 		if ln.network == "unix" {
 			os.RemoveAll(ln.addr)
@@ -181,3 +186,122 @@ type listener struct {
 	addr    string
 	naddr   net.Addr
 }
+
+func parseAddr(addr string) (network, address string, stdlib bool) {
+	network = "tcp"
+	address = addr
+	if strings.Contains(address, "://") {
+		network = strings.Split(address, "://")[0]
+		address = strings.Split(address, "://")[1]
+	}
+	if strings.HasSuffix(network, "-net") {
+		stdlib = true
+		network = network[:len(network)-4]
+	}
+	return
+}
+
+// // type timeoutHeap []timeoutHeapItem
+
+// // func (h timeoutHeap) Len() int           { return len(h) }
+// // func (h timeoutHeap) Less(i, j int) bool { return h[i].timeout < h[j].timeout }
+// // func (h timeoutHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+// // func (h *timeoutHeap) Push(x interface{}) {
+// // 	*h = append(*h, x.(timeoutHeapItem))
+// // }
+// // func (h *timeoutHeap) Pop() interface{} {
+// // 	old := *h
+// // 	n := len(old)
+// // 	x := old[n-1]
+// // 	*h = old[0 : n-1]
+// // 	return x
+// // }
+
+// type timeoutQueue struct {
+// 	h *timeoutHeap
+// }
+
+// func newTimeoutQueue() *timeoutQueue {
+// 	q := &timeoutQueue{&timeoutHeap{}}
+// 	heap.Init(q.h)
+// 	return q
+// }
+// func (q *timeoutQueue) len() int {
+// 	return q.h.Len()
+// }
+// func (q *timeoutQueue) push(id int, timeout int64) {
+// 	heap.Push(q.h, timeoutHeapItem{id: id, timeout: timeout})
+// }
+// func (q *timeoutQueue) peek() (id int, timeout int64) {
+// 	if q.len() > 0 {
+// 		id = (*(q.h))[0].id
+// 		timeout = (*(q.h))[0].timeout
+// 	}
+// 	return
+// }
+// func (q *timeoutQueue) pop() (id int, timeout int64) {
+// 	if q.len() > 0 {
+// 		item := q.h.Pop().(timeoutHeapItem)
+// 		id = item.id
+// 		timeout = item.timeout
+// 	}
+// 	return
+// }
+
+// // func init() {
+// // 	rand.Seed(time.Now().UnixNano())
+// // 	q := newTimeoutQueue()
+// // 	for i := 0; i < 1000; i++ {
+// // 		q.push(i, rand.Int63()%9000)
+// // 	}
+// // 	for q.len() > 0 {
+// // 		id, timeout := q.pop()
+// // 		fmt.Printf("%05d %05d\n", id, timeout)
+// // 	}
+// // }
+
+// type timeoutHeapItem struct {
+// 	id      int
+// 	timeout int64
+// }
+// type timeoutHeap []timeoutHeapItem
+
+// func (h timeoutHeap) Len() int           { return len(h) }
+// func (h timeoutHeap) Less(i, j int) bool { return h[i].timeout < h[j].timeout }
+// func (h timeoutHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+
+// func (h *timeoutHeap) Push(x interface{}) {
+// 	// Push and Pop use pointer receivers because they modify the slice's length,
+// 	// not just its contents.
+// 	*h = append(*h, x.(timeoutHeapItem))
+// }
+
+// func (h *timeoutHeap) Pop() interface{} {
+// 	old := *h
+// 	n := len(old)
+// 	x := old[n-1]
+// 	*h = old[0 : n-1]
+// 	return x
+// }
+
+// // This example inserts several ints into an IntHeap, checks the minimum,
+// // and removes them in order of priority.
+// func init() {
+// 	q := newTimeoutQueue()
+// 	rand.Seed(time.Now().UnixNano())
+// 	// h := &timeoutHeap{}
+// 	// heap.Init(h)
+
+// 	for i := 10; i < 20; i++ {
+// 		//heap.Push(h, timeoutHeapItem{i, rand.Int63() % 10})
+// 		q.push(i, rand.Int63()%10)
+// 	}
+// 	_, timeout := q.peek()
+// 	fmt.Printf("minimum: %d\n", timeout)
+// 	for q.len() > 0 {
+// 		//v := heap.Pop(h).(timeoutHeapItem)
+// 		_, timeout = q.pop()
+// 		fmt.Printf("%d ", timeout)
+// 	}
+// 	fmt.Printf("\n")
+// }

evio_loop.go

@@ -54,19 +54,22 @@ func (ln *listener) system() error {
 }
 
 type unixConn struct {
-	id, fd, p int
+	id, fd   int
-	outbuf    []byte
+	outbuf   []byte
-	outpos    int
+	outpos   int
-	action    Action
+	action   Action
-	opts      Options
+	opts     Options
-	raddr     net.Addr
+	timeout  time.Time
-	laddr     net.Addr
+	err      error
-	err       error
+	wake     bool
-	wake      bool
+	writeon  bool
-	writeon   bool
+	detached bool
-	detached  bool
+	closed   bool
-	attaching bool
+	opening  bool
-	closed    bool
+}
+
+func (c *unixConn) Timeout() time.Time {
+	return c.timeout
 }
 
 func (c *unixConn) Read(p []byte) (n int, err error) {
@@ -113,7 +116,6 @@ func (c *unixConn) Close() error {
 	c.closed = true
 	return err
 }
-
 func serve(events Events, lns []*listener) error {
 	p, err := internal.MakePoll()
 	if err != nil {
@@ -130,8 +132,10 @@ func serve(events Events, lns []*listener) error {
 	unlock := func() { mu.Unlock() }
 	fdconn := make(map[int]*unixConn)
 	idconn := make(map[int]*unixConn)
+
+	timeoutqueue := internal.NewTimeoutQueue()
 	var id int
-	ctx := Context{
+	ctx := Server{
 		Wake: func(id int) bool {
 			var ok = true
 			var err error
@@ -141,7 +145,7 @@ func serve(events Events, lns []*listener) error {
 				ok = false
 			} else if !c.wake {
 				c.wake = true
-				err = internal.AddWrite(c.p, c.fd, &c.writeon)
+				err = internal.AddWrite(p, c.fd, &c.writeon)
 			}
 			unlock()
 			if err != nil {
@@ -149,69 +153,77 @@ func serve(events Events, lns []*listener) error {
 			}
 			return ok
 		},
-		Attach: func(v interface{}) error {
+		Dial: func(addr string, timeout time.Duration) (int, error) {
-			var fd int
+			network, address, _ := parseAddr(addr)
+			var taddr net.Addr
 			var err error
-			switch v := v.(type) {
+			switch network {
 			default:
-				return errors.New("invalid type")
+				return 0, errors.New("invalid network")
-			case *net.TCPConn:
+			case "unix":
-				f, err := v.File()
+			case "tcp", "tcp4", "tcp6":
+				taddr, err = net.ResolveTCPAddr(network, address)
 				if err != nil {
-					return err
+					return 0, err
+				}
+			}
+			var fd int
+			var sa syscall.Sockaddr
+			switch taddr := taddr.(type) {
+			case *net.UnixAddr:
+				sa = &syscall.SockaddrUnix{Name: taddr.Name}
+			case *net.TCPAddr:
+				if len(taddr.IP) == 4 {
+					var sa4 syscall.SockaddrInet4
+					copy(sa4.Addr[:], taddr.IP[:])
+					sa4.Port = taddr.Port
+					sa = &sa4
+					fd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
+				} else if len(taddr.IP) == 16 {
+					var sa6 syscall.SockaddrInet6
+					copy(sa6.Addr[:], taddr.IP[:])
+					sa6.Port = taddr.Port
+					sa = &sa6
+					fd, err = syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, 0)
+				} else {
+					return 0, errors.New("invalid network")
 				}
-				fd = int(f.Fd())
-			case *net.UnixConn:
-				f, err := v.File()
-				if err != nil {
-					return err
-				}
-				fd = int(f.Fd())
-			case *os.File:
-				fd = int(v.Fd())
-			case int:
-				fd = v
-			case uintptr:
-				fd = int(v)
 			}
-			err = syscall.SetNonblock(fd, true)
 			if err != nil {
-				println(456)
+				return 0, err
-				return err
+			}
+			if err := syscall.SetNonblock(fd, true); err != nil {
+				syscall.Close(fd)
+				return 0, err
+			}
+			err = syscall.Connect(fd, sa)
+			if err != nil && err != syscall.EINPROGRESS {
+				syscall.Close(fd)
+				return 0, err
 			}
 			lock()
 			err = internal.AddRead(p, fd)
 			if err != nil {
 				unlock()
-				return err
+				syscall.Close(fd)
+				return 0, err
 			}
 			id++
-			c := &unixConn{id: id, fd: fd, p: p}
+			c := &unixConn{id: id, fd: fd, opening: true}
-			c.attaching = true
-			fdconn[fd] = c
-			idconn[id] = c
-			if events.Attached != nil {
-				unlock()
-				out, opts, action := events.Attached(id, v)
-				lock()
-				if opts.TCPKeepAlive > 0 {
-					internal.SetKeepAlive(fd, int(c.opts.TCPKeepAlive/time.Second))
-				}
-				c.action = action
-				if len(out) > 0 {
-					c.outbuf = append(c.outbuf, out...)
-				}
-			}
-			// if len(c.outbuf) > 0 || c.action != None {
 			err = internal.AddWrite(p, fd, &c.writeon)
 			if err != nil {
 				unlock()
-				panic(err)
+				syscall.Close(fd)
+				return 0, err
+			}
+			fdconn[fd] = c
+			idconn[id] = c
+			if timeout != 0 {
+				c.timeout = time.Now().Add(timeout)
+				timeoutqueue.Push(c)
 			}
-			// }
 			unlock()
-			// println("---")
+			return id, nil
-			return nil
 		},
 	}
 	ctx.Addrs = make([]net.Addr, len(lns))
@@ -227,47 +239,109 @@ func serve(events Events, lns []*listener) error {
 	defer func() {
 		lock()
 		type fdid struct {
-			fd, id int
+			fd, id  int
-			opts   Options
+			opening bool
 		}
 		var fdids []fdid
 		for fd, c := range fdconn {
-			fdids = append(fdids, fdid{fd, c.id, c.opts})
+			fdids = append(fdids, fdid{fd, c.id, c.opening})
 		}
 		sort.Slice(fdids, func(i, j int) bool {
 			return fdids[j].id < fdids[i].id
 		})
 		for _, fdid := range fdids {
 			syscall.Close(fdid.fd)
+			if fdid.opening {
+				if events.Opened != nil {
+					laddr := getlocaladdr(fdid.fd)
+					raddr := getremoteaddr(fdid.fd)
+					unlock()
+					events.Opened(fdid.id, Conn{
+						Closing:    true,
+						AddrIndex:  -1,
+						LocalAddr:  laddr,
+						RemoteAddr: raddr,
+					})
+					lock()
+				}
+			}
 			if events.Closed != nil {
 				unlock()
 				events.Closed(fdid.id, nil)
 				lock()
 			}
 		}
+		syscall.Close(p)
 		unlock()
 	}()
 	var packet [0xFFFF]byte
 	var evs = internal.MakeEvents(64)
-	var lastTicker time.Time
+	nextTicker := time.Now()
-	var tickerDelay time.Duration
-	if events.Tick == nil {
-		tickerDelay = time.Hour
-	}
 	for {
-		pn, err := internal.Wait(p, evs, tickerDelay)
+		delay := nextTicker.Sub(time.Now())
+		if delay < 0 {
+			delay = 0
+		} else if delay > time.Second/4 {
+			delay = time.Second / 4
+		}
+		pn, err := internal.Wait(p, evs, delay)
 		if err != nil && err != syscall.EINTR {
 			return err
 		}
 		if events.Tick != nil {
-			now := time.Now()
+			remain := nextTicker.Sub(time.Now())
-			if now.Sub(lastTicker) > tickerDelay {
+			if remain < 0 {
+				var tickerDelay time.Duration
 				var action Action
-				tickerDelay, action = events.Tick()
+				if events.Tick != nil {
-				if action == Shutdown {
+					tickerDelay, action = events.Tick()
-					return nil
+					if action == Shutdown {
+						return nil
+					}
+				} else {
+					tickerDelay = time.Hour
 				}
-				lastTicker = now
+				nextTicker = time.Now().Add(tickerDelay + remain)
+			}
+		}
+		// check timeouts
+		if timeoutqueue.Len() > 0 {
+			var count int
+			now := time.Now()
+			for {
+				v := timeoutqueue.Peek()
+				if v == nil {
+					break
+				}
+				c := v.(*unixConn)
+				if now.After(v.Timeout()) {
+					timeoutqueue.Pop()
+					if _, ok := idconn[c.id]; ok {
+						delete(idconn, c.id)
+						delete(fdconn, c.fd)
+						syscall.Close(c.fd)
+						if events.Opened != nil {
+							laddr := getlocaladdr(c.fd)
+							raddr := getremoteaddr(c.fd)
+							events.Opened(c.id, Conn{
+								Closing:    true,
+								AddrIndex:  -1,
+								LocalAddr:  laddr,
+								RemoteAddr: raddr,
+							})
+						}
+						if events.Closed != nil {
+							events.Closed(c.id, syscall.ETIMEDOUT)
+						}
+						count++
+					}
+				} else {
+					break
+				}
+			}
+			if count > 0 {
+				// invalidate the current events and wait for more
+				continue
 			}
 		}
 		lock()
@@ -280,39 +354,25 @@ func serve(events Events, lns []*listener) error {
 			var ln *listener
 			var lnidx int
 			var fd = internal.GetFD(evs, i)
-			var sa syscall.Sockaddr
 			for lnidx, ln = range lns {
 				if fd == ln.fd {
 					goto accept
 				}
 			}
+			ln = nil
 			c = fdconn[fd]
 			if c == nil {
 				syscall.Close(fd)
 				goto next
 			}
-			if c.attaching {
+			if c.opening {
-				println(fd)
-				goto next
-				// opt, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_ERROR)
-				// if opt != 0 {
 
-				// }
+				lnidx = -1
-				// fmt.Printf(">> %v %v\n", opt, err)
+				goto opened
-				switch evs.([]syscall.Kevent_t)[i].Filter {
-				case syscall.EVFILT_WRITE:
-					println(123)
-					goto write
-				case syscall.EVFILT_READ:
-					println(456)
-					goto read
-				default:
-					goto next
-				}
 			}
 			goto read
 		accept:
-			nfd, sa, err = syscall.Accept(fd)
+			nfd, _, err = syscall.Accept(fd)
 			if err != nil {
 				goto next
 			}
@@ -323,26 +383,32 @@ func serve(events Events, lns []*listener) error {
 				goto fail
 			}
 			id++
-			c = &unixConn{id: id, fd: nfd, p: p}
+			c = &unixConn{id: id, fd: nfd}
 			fdconn[nfd] = c
 			idconn[id] = c
-			c.laddr = getlocaladdr(fd, ln.ln)
+			goto opened
-			c.raddr = getaddr(sa, ln.ln)
+		opened:
 			if events.Opened != nil {
+				laddr := getlocaladdr(fd)
+				raddr := getremoteaddr(fd)
 				unlock()
-				out, c.opts, c.action = events.Opened(c.id, Addr{lnidx, c.laddr, c.raddr})
+				out, c.opts, c.action = events.Opened(c.id, Conn{
+					AddrIndex:  lnidx,
+					LocalAddr:  laddr,
+					RemoteAddr: raddr,
+				})
 				lock()
 				if c.opts.TCPKeepAlive > 0 {
-					if _, ok := ln.ln.(*net.TCPListener); ok {
+					internal.SetKeepAlive(c.fd, int(c.opts.TCPKeepAlive/time.Second))
-						if err = internal.SetKeepAlive(c.fd, int(c.opts.TCPKeepAlive/time.Second)); err != nil {
-							goto fail
-						}
-					}
 				}
 				if len(out) > 0 {
 					c.outbuf = append(c.outbuf, out...)
 				}
 			}
+			if c.opening {
+				c.opening = false
+				goto next
+			}
 			goto write
 		read:
 			if c.action != None {
@@ -394,12 +460,11 @@ func serve(events Events, lns []*listener) error {
 					}
 				}
 				if n == 0 || err != nil {
-					println("C")
 					if c.action == Shutdown {
 						goto close
 					}
 					if err == syscall.EAGAIN {
-						if err = internal.AddWrite(c.p, c.fd, &c.writeon); err != nil {
+						if err = internal.AddWrite(p, c.fd, &c.writeon); err != nil {
 							goto fail
 						}
 						goto next
@@ -418,7 +483,7 @@ func serve(events Events, lns []*listener) error {
 			}
 			if len(c.outbuf)-c.outpos == 0 {
 				if !c.wake {
-					if err = internal.DelWrite(c.p, c.fd, &c.writeon); err != nil {
+					if err = internal.DelWrite(p, c.fd, &c.writeon); err != nil {
 						goto fail
 					}
 				}
@@ -426,7 +491,7 @@ func serve(events Events, lns []*listener) error {
 					goto close
 				}
 			} else {
-				if err = internal.AddWrite(c.p, c.fd, &c.writeon); err != nil {
+				if err = internal.AddWrite(p, c.fd, &c.writeon); err != nil {
 					goto fail
 				}
 			}
@@ -434,6 +499,7 @@ func serve(events Events, lns []*listener) error {
 		close:
 			delete(fdconn, c.fd)
 			delete(idconn, c.id)
+			//delete(idtimeout, c.id)
 			if c.action == Detach {
 				if events.Detached != nil {
 					c.detached = true
@@ -476,30 +542,23 @@ func serve(events Events, lns []*listener) error {
 	}
 }
 
-func getlocaladdr(fd int, ln net.Listener) net.Addr {
+func getlocaladdr(fd int) net.Addr {
 	sa, _ := syscall.Getsockname(fd)
-	return getaddr(sa, ln)
+	return getaddr(sa)
 }
-
+func getremoteaddr(fd int) net.Addr {
-func getaddr(sa syscall.Sockaddr, ln net.Listener) net.Addr {
+	sa, _ := syscall.Getpeername(fd)
-	switch ln.(type) {
+	return getaddr(sa)
-	case *net.UnixListener:
+}
-		return ln.Addr()
+func getaddr(sa syscall.Sockaddr) net.Addr {
-	case *net.TCPListener:
+	switch sa := sa.(type) {
-		var addr net.TCPAddr
+	default:
-		switch sa := sa.(type) {
+		return nil
-		case *syscall.SockaddrInet4:
+	case *syscall.SockaddrInet4:
-			addr.IP = net.IP(sa.Addr[:])
+		return &net.TCPAddr{IP: net.IP(sa.Addr[:]), Port: sa.Port}
-			addr.Port = sa.Port
+	case *syscall.SockaddrInet6:
-			return &addr
+		return &net.TCPAddr{IP: net.IP(sa.Addr[:]), Port: sa.Port, Zone: strconv.FormatInt(int64(sa.ZoneId), 10)}
-		case *syscall.SockaddrInet6:
+	case *syscall.SockaddrUnix:
-			addr.IP = net.IP(sa.Addr[:])
+		return &net.UnixAddr{Net: "unix", Name: sa.Name}
-			addr.Port = sa.Port
-			if sa.ZoneId != 0 {
-				addr.Zone = strconv.FormatInt(int64(sa.ZoneId), 10)
-			}
-			return &addr
-		}
 	}
-	return nil
 }

evio_net.go

@@ -68,7 +68,7 @@ func servenet(events Events, lns []*listener) error {
 	var cmu sync.Mutex
 	var idconn = make(map[int]*netConn)
 	var done bool
-	ctx := Context{
+	ctx := Server{
 		Wake: func(id int) bool {
 			cmu.Lock()
 			c := idconn[id]
@@ -166,7 +166,11 @@ func servenet(events Events, lns []*listener) error {
 						var action Action
 						mu.Lock()
 						if !done {
-							out, opts, action = events.Opened(id, Addr{lnidx, conn.LocalAddr(), conn.RemoteAddr()})
+							out, opts, action = events.Opened(id, Conn{
+								AddrIndex:  lnidx,
+								LocalAddr:  conn.LocalAddr(),
+								RemoteAddr: conn.RemoteAddr(),
+							})
 						}
 						mu.Unlock()
 						if opts.TCPKeepAlive > 0 {

evio_translate.go

@@ -70,11 +70,11 @@ func NopConn(rw io.ReadWriter) net.Conn {
 // that performs the actual translation.
 func Translate(
 	events Events,
-	should func(id int, addr Addr) bool,
+	should func(id int, conn Conn) bool,
 	translate func(id int, rd io.ReadWriter) io.ReadWriter,
 ) Events {
 	tevents := events
-	var ctx Context
+	var ctx Server
 	var mu sync.Mutex
 	idc := make(map[int]*tconn)
 	get := func(id int) *tconn {
@@ -180,23 +180,23 @@ func Translate(
 		c.mu.Unlock()
 		return err
 	}
-	tevents.Serving = func(ctxin Context) (action Action) {
+	tevents.Serving = func(ctxin Server) (action Action) {
 		ctx = ctxin
 		if events.Serving != nil {
 			action = events.Serving(ctx)
 		}
 		return
 	}
-	tevents.Opened = func(id int, addr Addr) (out []byte, opts Options, action Action) {
+	tevents.Opened = func(id int, conn Conn) (out []byte, opts Options, action Action) {
-		if should != nil && !should(id, addr) {
+		if should != nil && !should(id, conn) {
 			if events.Opened != nil {
-				out, opts, action = events.Opened(id, addr)
+				out, opts, action = events.Opened(id, conn)
 			}
 			return
 		}
 		c := create(id)
 		if events.Opened != nil {
-			out, opts, c.action = events.Opened(id, addr)
+			out, opts, c.action = events.Opened(id, conn)
 			if len(out) > 0 {
 				c.write(1, out)
 				out = nil

examples/redis-server/main.go

@@ -8,9 +8,8 @@ import (
 	"flag"
 	"fmt"
 	"log"
-	"net"
+	"strconv"
 	"strings"
-	"syscall"
 	"time"
 
 	"github.com/tidwall/evio"
@@ -23,61 +22,49 @@ type conn struct {
 	wget bool
 }
 
-func Dial(network, addr string) (fd int, err error) {
-	taddr, err := net.ResolveTCPAddr(network, addr)
-	if err != nil {
-		return 0, err
-	}
-	fd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
-	if err != nil {
-		return 0, err
-	}
-	if err := syscall.SetNonblock(fd, true); err != nil {
-		syscall.Close(fd)
-		return 0, err
-	}
-	var sa syscall.SockaddrInet4
-	copy(sa.Addr[:], taddr.IP[:])
-	sa.Port = taddr.Port
-	err = syscall.Connect(fd, &sa)
-	if err != nil && err != syscall.EINPROGRESS {
-		syscall.Close(fd)
-		return 0, err
-	}
-	return fd, nil
-}
-
 func main() {
 	var port int
 	var unixsocket string
-	var ctx evio.Context
+	var srv evio.Server
 	flag.IntVar(&port, "port", 6380, "server port")
 	flag.StringVar(&unixsocket, "unixsocket", "socket", "unix socket")
 	flag.Parse()
 	var conns = make(map[int]*conn)
 	var keys = make(map[string]string)
 	var events evio.Events
-	events.Serving = func(ctxin evio.Context) (action evio.Action) {
+	events.Serving = func(srvin evio.Server) (action evio.Action) {
-		ctx = ctxin
+		srv = srvin
 		log.Printf("redis server started on port %d", port)
 		if unixsocket != "" {
 			log.Printf("redis server started at %s", unixsocket)
 		}
 		return
 	}
-	events.Attached = func(id int, v interface{}) (out []byte, opts evio.Options, action evio.Action) {
+	wgetids := make(map[int]time.Time)
-		conns[id] = &conn{wget: true}
+	events.Opened = func(id int, cn evio.Conn) (out []byte, opts evio.Options, action evio.Action) {
-		println("attached", id)
+		c := &conn{}
-		out = []byte("GET / HTTP/1.0\r\n\r\n")
+		if !wgetids[id].IsZero() {
+			delete(wgetids, id)
+			c.wget = true
+		}
+		conns[id] = c
+		println("opened", id, c.wget)
+		if c.wget {
+			out = []byte("GET / HTTP/1.0\r\n\r\n")
+		}
 		return
 	}
-	events.Opened = func(id int, addr evio.Addr) (out []byte, opts evio.Options, action evio.Action) {
+	events.Tick = func() (delay time.Duration, action evio.Action) {
-		println("opened", id)
+		now := time.Now()
-		conns[id] = &conn{}
+		for id, t := range wgetids {
+			if now.Sub(t) > time.Second {
+				srv.Wake(id)
+			}
+		}
+		delay = time.Second
 		return
 	}
 	events.Closed = func(id int, err error) (action evio.Action) {
-
 		fmt.Printf("closed %d %v\n", id, err)
 		delete(conns, id)
 		return
@@ -86,6 +73,7 @@ func main() {
 		c := conns[id]
 		if c.wget {
 			println(string(in))
+			action = evio.Close
 			return
 		}
 		data := c.is.Begin(in)
@@ -109,33 +97,19 @@ func main() {
 				default:
 					out = redcon.AppendError(out, "ERR unknown command '"+string(args[0])+"'")
 				case "WGET":
-					if len(args) != 2 {
+					if len(args) != 3 {
 						out = redcon.AppendError(out, "ERR wrong number of arguments for '"+string(args[0])+"' command")
 					} else {
 						start := time.Now()
-						fd, err := Dial("tcp", string(args[1]))
+						n, _ := strconv.ParseInt(string(args[2]), 10, 63)
+						cid, err := srv.Dial("tcp://"+string(args[1]), time.Duration(n)*time.Second)
 						if err != nil {
 							out = redcon.AppendError(out, err.Error())
 						} else {
-							time.Since(start)
+							wgetids[cid] = time.Now()
+							println(cid, time.Since(start).String())
 							out = redcon.AppendOK(out)
-							ctx.Attach(fd)
 						}
-						// conn, err := net.Dial("tcp", string(args[1]))
-						// if err != nil {
-						// 	out = redcon.AppendError(out, err.Error())
-						// } else {
-						// 	println(time.Since(start).String())
-						// 	f, err := conn.(*net.TCPConn).File()
-						// 	if err != nil {
-						// 		conn.Close()
-						// 		out = redcon.AppendError(out, err.Error())
-						// 	} else {
-						// 		out = redcon.AppendOK(out)
-
-						// 		ctx.Attach(f.Fd())
-						// 	}
-						// }
 					}
 				case "PING":
 					if len(args) > 2 {

internal/internal_test.go

@@ -0,0 +1,34 @@
+package internal
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+type queueItem struct {
+	timeout time.Time
+}
+
+func (item *queueItem) Timeout() time.Time {
+	return item.timeout
+}
+
+func TestQueue(t *testing.T) {
+	q := NewTimeoutQueue()
+	item := &queueItem{timeout: time.Unix(0, 5)}
+	q.Push(item)
+	q.Push(&queueItem{timeout: time.Unix(0, 3)})
+	q.Push(&queueItem{timeout: time.Unix(0, 20)})
+	q.Push(&queueItem{timeout: time.Unix(0, 13)})
+	var out string
+	for q.Len() > 0 {
+		pitem := q.Peek()
+		item := q.Pop()
+		out += fmt.Sprintf("(%v:%v) ", pitem.Timeout().UnixNano(), item.Timeout().UnixNano())
+	}
+	exp := "(3:3) (5:5) (13:13) (20:20) "
+	if out != exp {
+		t.Fatalf("expected '%v', got '%v'", exp, out)
+	}
+}

internal/timeoutqueue.go

@@ -0,0 +1,70 @@
+package internal
+
+import (
+	"container/heap"
+	"time"
+)
+
+// TimeoutQueueItem is an item for TimeoutQueue
+type TimeoutQueueItem interface {
+	Timeout() time.Time
+}
+
+type timeoutPriorityQueue []TimeoutQueueItem
+
+func (pq timeoutPriorityQueue) Len() int { return len(pq) }
+
+func (pq timeoutPriorityQueue) Less(i, j int) bool {
+	return pq[i].Timeout().Before(pq[j].Timeout())
+}
+
+func (pq timeoutPriorityQueue) Swap(i, j int) {
+	pq[i], pq[j] = pq[j], pq[i]
+}
+
+func (pq *timeoutPriorityQueue) Push(x interface{}) {
+	*pq = append(*pq, x.(TimeoutQueueItem))
+}
+
+func (pq *timeoutPriorityQueue) Pop() interface{} {
+	old := *pq
+	n := len(old)
+	item := old[n-1]
+	*pq = old[0 : n-1]
+	return item
+}
+
+// TimeoutQueue is a priority queue ordere be ascending time.Time.
+type TimeoutQueue struct {
+	pq timeoutPriorityQueue
+}
+
+// NewTimeoutQueue returns a new TimeoutQueue.
+func NewTimeoutQueue() *TimeoutQueue {
+	q := &TimeoutQueue{}
+	heap.Init(&q.pq)
+	return q
+}
+
+// Push adds a new item.
+func (q *TimeoutQueue) Push(x TimeoutQueueItem) {
+	heap.Push(&q.pq, x)
+}
+
+// Pop removes and returns the items with the smallest value.
+func (q *TimeoutQueue) Pop() TimeoutQueueItem {
+	return heap.Pop(&q.pq).(TimeoutQueueItem)
+}
+
+// Peek returns the items with the smallest value, but does not remove it.
+func (q *TimeoutQueue) Peek() TimeoutQueueItem {
+	if q.Len() > 0 {
+		return q.pq[0]
+	}
+	return nil
+}
+
+// Len returns the number of items in the queue
+func (q *TimeoutQueue) Len() int {
+	return q.pq.Len()
+}