fixes #198 negative send/receive deadlines do not work

protocol/rep/rep.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Mangos Authors
+// Copyright 2020 The Mangos Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -96,7 +96,7 @@ func (c *context) RecvMsg() (*protocol.Message, error) {
 	expireTime := c.recvExpire
 	s.Unlock()
 
-	if expireTime > 0 {
+	if expireTime != 0 {
 		wq = time.After(expireTime)
 	}
 
@@ -107,10 +107,15 @@ func (c *context) RecvMsg() (*protocol.Message, error) {
 	select {
 	case entry := <-s.recvQ:
 		m, p = entry.m, entry.p
-	case <-wq:
-		err = protocol.ErrRecvTimeout
-	case <-cq:
-		err = protocol.ErrClosed
+	default:
+		select {
+		case entry := <-s.recvQ:
+			m, p = entry.m, entry.p
+		case <-wq:
+			err = protocol.ErrRecvTimeout
+		case <-cq:
+			err = protocol.ErrClosed
+		}
 	}
 
 	s.Lock()
@@ -144,7 +149,7 @@ func (c *context) SendMsg(m *protocol.Message) error {
 	timeQ := nilQ
 	if bestEffort {
 		timeQ = closedQ
-	} else if c.sendExpire > 0 {
+	} else if c.sendExpire != 0 {
 		timeQ = time.After(c.sendExpire)
 	}
 
@@ -154,26 +159,31 @@ func (c *context) SendMsg(m *protocol.Message) error {
 	r.Unlock()
 
 	select {
-	case <-cq:
-		m.Header = nil
-		return protocol.ErrClosed
-	case <-p.closeQ:
-		// Pipe closed, so no way to get it to the recipient.
-		// Just discard the message.
-		m.Free()
+	case p.sendQ <- m:
 		return nil
-	case <-timeQ:
-		if bestEffort {
-			// No way to report to caller, so just discard
-			// the message.
+	default:
+		select {
+		case <-cq:
+			m.Header = nil
+			return protocol.ErrClosed
+		case <-p.closeQ:
+			// Pipe closed, so no way to get it to the recipient.
+			// Just discard the message.
 			m.Free()
 			return nil
-		}
-		m.Header = nil
-		return protocol.ErrSendTimeout
+		case <-timeQ:
+			if bestEffort {
+				// No way to report to caller, so just discard
+				// the message.
+				m.Free()
+				return nil
+			}
+			m.Header = nil
+			return protocol.ErrSendTimeout
 
-	case p.sendQ <- m:
-		return nil
+		case p.sendQ <- m:
+			return nil
+		}
 	}
 }
 
@@ -228,7 +238,7 @@ func (c *context) SetOption(name string, v interface{}) error {
 		return protocol.ErrBadValue
 
 	case protocol.OptionSendDeadline:
-		if val, ok := v.(time.Duration); ok && val > 0 {
+		if val, ok := v.(time.Duration); ok {
 			c.s.Lock()
 			c.sendExpire = val
 			c.s.Unlock()
@@ -237,7 +247,7 @@ func (c *context) SetOption(name string, v interface{}) error {
 		return protocol.ErrBadValue
 
 	case protocol.OptionRecvDeadline:
-		if val, ok := v.(time.Duration); ok && val > 0 {
+		if val, ok := v.(time.Duration); ok {
 			c.s.Lock()
 			c.recvExpire = val
 			c.s.Unlock()

protocol/rep/rep_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Mangos Authors
+// Copyright 2020 The Mangos Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -121,6 +121,40 @@ func TestRepBestEffortSend(t *testing.T) {
 	MustSucceed(t, p.Close())
 }
 
+func TestRepSendNonBlocking(t *testing.T) {
+	s := GetSocket(t, NewSocket)
+	p := GetSocket(t, xreq.NewSocket)
+	MustSucceed(t, s.SetOption(mangos.OptionWriteQLen, 1))
+	MustSucceed(t, p.SetOption(mangos.OptionReadQLen, 1))
+	MustSucceed(t, s.SetOption(mangos.OptionSendDeadline, time.Duration(-1)))
+
+	ConnectPair(t, s, p)
+	for i := 0; i < 100; i++ {
+		// We have to make a raw message when using xreq.  We
+		// use xreq because normal req will simply discard
+		// messages for requests it doesn't have outstanding.
+		m := mangos.NewMessage(0)
+		m.Header = make([]byte, 4)
+		binary.BigEndian.PutUint32(m.Header, uint32(i)|0x80000000)
+		MustSucceed(t, p.SendMsg(m))
+		m = MustRecvMsg(t, s)
+		start := time.Now()
+		e := s.SendMsg(m)
+		if e != nil {
+			MustBeError(t, e, mangos.ErrSendTimeout)
+			m.Free()
+			MustBeTrue(t, time.Since(start) < time.Second)
+			break
+		} else if i > 20 {
+			MustBeError(t, e, mangos.ErrSendTimeout)
+		}
+		// NB: We never ask the peer to receive it -- this ensures we
+		// encounter back-pressure.
+	}
+	MustSucceed(t, s.Close())
+	MustSucceed(t, p.Close())
+}
+
 // This verifies that closing the socket aborts a blocking send.
 // We use a context because closing the socket also closes pipes
 // making it less reproducible.
@@ -190,6 +224,23 @@ func TestRepRecvJunk(t *testing.T) {
 	MustSucceed(t, self.Close())
 }
 
+func TestRepRecvNonBlocking(t *testing.T) {
+	s := GetSocket(t, NewSocket)
+	defer MustClose(t, s)
+	p := GetSocket(t, req.NewSocket)
+	defer MustClose(t, p)
+
+	MustSucceed(t, s.SetOption(mangos.OptionRecvDeadline, time.Duration(-1)))
+
+	ConnectPair(t, s, p)
+
+	start := time.Now()
+	m, e := s.Recv()
+	MustBeNil(t, m)
+	MustBeError(t, e, mangos.ErrRecvTimeout)
+	MustBeTrue(t, time.Since(start) < time.Second)
+}
+
 func TestRepDoubleRecv(t *testing.T) {
 	self := GetSocket(t, NewSocket)
 	MustSucceed(t, self.SetOption(mangos.OptionRecvDeadline, time.Second))
@@ -266,7 +317,7 @@ func TestRepPipeRecvCloseSocket(t *testing.T) {
 
 // This sets up a bunch of contexts to run in parallel, and verifies that
 // they all seem to run with no mis-deliveries.
-func TestRespondentMultiContexts(t *testing.T) {
+func TestRepMultiContexts(t *testing.T) {
 	count := 30
 	repeat := 20
 

protocol/req/req.go

@@ -273,6 +273,8 @@ func (c *context) SendMsg(m *protocol.Message) error {
 			}
 			s.Unlock()
 		})
+	} else if c.sendExpire < 0 {
+		expired = true
 	}
 
 	s.send()
@@ -322,6 +324,10 @@ func (c *context) RecvMsg() (*protocol.Message, error) {
 	}
 
 	for id == c.reqID && c.repMsg == nil {
+		if c.recvExpire < 0 {
+			c.cancel()
+			return nil, protocol.ErrRecvTimeout
+		}
 		c.cond.Wait()
 	}
 

protocol/req/req_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Mangos Authors
+// Copyright 2020 The Mangos Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -78,6 +78,22 @@ func TestReqRecvDeadline(t *testing.T) {
 	MustSucceed(t, peer.Close())
 }
 
+func TestReqRecvNonBlocking(t *testing.T) {
+	self := GetSocket(t, NewSocket)
+	peer := GetSocket(t, rep.NewSocket)
+	ConnectPair(t, self, peer)
+	MustSucceed(t, self.SetOption(mangos.OptionRecvDeadline, time.Duration(-1)))
+	MustSucceed(t, self.Send([]byte{}))
+	_ = MustRecv(t, peer)
+	start := time.Now()
+	m, e := self.RecvMsg()
+	MustBeError(t, e, mangos.ErrRecvTimeout)
+	MustBeTrue(t, time.Since(start) < time.Second)
+	MustBeNil(t, m)
+	MustSucceed(t, self.Close())
+	MustSucceed(t, peer.Close())
+}
+
 func TestReqContextClosed(t *testing.T) {
 	s := GetSocket(t, NewSocket)
 	c, e := s.OpenContext()
@@ -160,8 +176,21 @@ func TestReqBestEffort(t *testing.T) {
 	MustSucceed(t, s.SetOption(mangos.OptionBestEffort, false))
 	MustBeError(t, s.Send(msg), mangos.ErrSendTimeout)
 	MustBeError(t, s.Send(msg), mangos.ErrSendTimeout)
+	MustClose(t, s)
 }
 
+func TestReqSendNonBlocking(t *testing.T) {
+	timeout := -time.Millisecond
+	msg := []byte{'0', '1', '2', '3'}
+
+	s := GetSocket(t, NewSocket)
+	MustSucceed(t, s.SetOption(mangos.OptionSendDeadline, timeout))
+	MustSucceed(t, s.Listen(AddrTestInp()))
+	MustBeError(t, s.Send(msg), mangos.ErrSendTimeout)
+	MustClose(t, s)
+}
+
+
 // This test demonstrates cancellation before calling receive but after the
 // message is received causes the original message to be discarded.
 func TestReqRetry(t *testing.T) {

protocol/respondent/respondent.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Mangos Authors
+// Copyright 2020 The Mangos Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -102,6 +102,8 @@ func (c *context) RecvMsg() (*protocol.Message, error) {
 
 		if expTime > 0 {
 			tq = time.After(expTime)
+		} else if expTime < 0 {
+			tq = closedQ
 		}
 
 		select {
@@ -147,6 +149,8 @@ func (c *context) SendMsg(m *protocol.Message) error {
 		tq = closedQ
 	} else if c.sendExpire > 0 {
 		tq = time.After(c.sendExpire)
+	} else if c.sendExpire < 0 {
+		tq = closedQ
 	}
 
 	m.Header = bt
@@ -220,7 +224,7 @@ func (c *context) GetOption(name string) (interface{}, error) {
 func (c *context) SetOption(name string, v interface{}) error {
 	switch name {
 	case protocol.OptionSendDeadline:
-		if val, ok := v.(time.Duration); ok && val.Nanoseconds() > 0 {
+		if val, ok := v.(time.Duration); ok {
 			c.s.Lock()
 			c.sendExpire = val
 			c.s.Unlock()
@@ -229,7 +233,7 @@ func (c *context) SetOption(name string, v interface{}) error {
 		return protocol.ErrBadValue
 
 	case protocol.OptionRecvDeadline:
-		if val, ok := v.(time.Duration); ok && val.Nanoseconds() > 0 {
+		if val, ok := v.(time.Duration); ok {
 			c.s.Lock()
 			c.recvExpire = val
 			c.s.Unlock()

protocol/respondent/respondent_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Mangos Authors
+// Copyright 2020 The Mangos Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -264,6 +264,15 @@ func TestRespondentRecvExpire(t *testing.T) {
 	MustSucceed(t, s.Close())
 }
 
+func TestRespondentRecvNonBlocking(t *testing.T) {
+	s := GetSocket(t, NewSocket)
+	MustSucceed(t, s.SetOption(mangos.OptionRecvDeadline, time.Duration(-1)))
+	v, e := s.RecvMsg()
+	MustBeError(t, e, mangos.ErrRecvTimeout)
+	MustBeNil(t, v)
+	MustSucceed(t, s.Close())
+}
+
 func TestRespondentSendState(t *testing.T) {
 	s := GetSocket(t, NewSocket)
 	MustBeError(t, s.Send([]byte{}), mangos.ErrProtoState)
@@ -297,6 +306,43 @@ func TestRespondentBestEffortSend(t *testing.T) {
 	MustSucceed(t, p.Close())
 }
 
+func TestRespondentSendNonBlocking(t *testing.T) {
+	s := GetSocket(t, NewSocket)
+	p := GetSocket(t, xsurveyor.NewSocket)
+	MustSucceed(t, s.SetOption(mangos.OptionWriteQLen, 1))
+	MustSucceed(t, p.SetOption(mangos.OptionReadQLen, 1))
+	MustSucceed(t, s.SetOption(mangos.OptionSendDeadline, time.Duration(-1)))
+
+	ConnectPair(t, s, p)
+	for i := 0; i < 100; i++ {
+		// We have to make a raw message when using xsurveyor.  We
+		// use xsurveyor because normal surveyor will simply discard
+		// messages for surveys it doesn't have outstanding.
+		m := mangos.NewMessage(0)
+		m.Header = make([]byte, 4)
+		binary.BigEndian.PutUint32(m.Header, uint32(i)|0x80000000)
+		MustSucceed(t, p.SendMsg(m))
+		m, e := s.RecvMsg()
+		MustSucceed(t, e)
+		MustNotBeNil(t, m)
+		start := time.Now()
+		e = s.SendMsg(m)
+		if e != nil {
+			MustBeError(t, e, mangos.ErrSendTimeout)
+			m.Free()
+			MustBeTrue(t, time.Since(start) < time.Second)
+			break
+		} else if i > 20 {
+			MustBeError(t, e, mangos.ErrSendTimeout)
+		}
+
+		// NB: We never ask the peer to receive it -- this ensures we
+		// encounter backpressure.
+	}
+	MustSucceed(t, s.Close())
+	MustSucceed(t, p.Close())
+}
+
 func TestRespondentSendBackPressure(t *testing.T) {
 	s := GetSocket(t, NewSocket)
 	p := GetSocket(t, xsurveyor.NewSocket)