예제 #1
0
func (c *Channel) write(pkt *lob.Packet, p *Pipe) error {
	if pkt.TID == 0 {
		pkt.TID = tracer.NewID()
	}

	if c.broken {
		// When a channel is marked as broken the all writes
		// must return a BrokenChannelError.
		return c.traceWriteError(pkt, p,
			&BrokenChannelError{c.hashname, c.typ, c.id})
	}

	if c.writeDeadlineReached {
		// When a channel reached a write deadline then all writes
		// must return a ErrTimeout.
		return c.traceWriteError(pkt, p,
			ErrTimeout)
	}

	if c.deliveredEnd {
		// When a channel sent a packet with the "end" header set
		// then all subsequent writes must return io.EOF
		return c.traceWriteError(pkt, p,
			io.EOF)
	}

	c.oSeq++
	hdr := pkt.Header()
	hdr.C, hdr.HasC = c.id, true
	if c.reliable {
		hdr.Seq, hdr.HasSeq = c.oSeq, true
	}
	if !c.serverside && c.oSeq == cInitialSeq {
		hdr.Type, hdr.HasType = c.typ, true
	}

	end := hdr.HasEnd && hdr.End
	if end {
		c.deliveredEnd = true
		c.setCloseDeadline()
	}

	if c.reliable {
		if c.oSeq%30 == 0 || hdr.End {
			c.applyAckHeaders(pkt)
		}
		c.writeBuffer[c.oSeq] = &writeBufferEntry{pkt, end, time.Time{}, p}
		c.needsResend = false
	}

	err := c.x.deliverPacket(pkt, p)
	if err != nil {
		return c.traceWriteError(pkt, p, err)
	}
	statChannelSndPkt.Add(1)
	if pkt.Header().HasAck {
		statChannelSndAckInline.Add(1)
	}

	if c.oSeq == cInitialSeq && c.serverside {
		c.unsetOpenDeadline()
	}

	c.traceWrite(pkt, p)

	if !c.reliable {
		pkt.Free()
	}

	return nil
}
예제 #2
0
func BenchmarkReadWriteUnreliable(b *testing.B) {
	defer dumpExpVar(b)
	logs.ResetLogger()

	withTwoEndpoints(b, func(A, B *Endpoint) {
		A.setOptions(DisableLog())
		B.setOptions(DisableLog())

		var (
			c     *Channel
			ident *Identity
			pkt   *lob.Packet
			err   error
			body  = bytes.Repeat([]byte{'x'}, 1300)
		)

		b.SetBytes(int64(len(body)))
		b.ResetTimer()

		go func() {
			c, err := A.Listen("flood", false).AcceptChannel()
			if err != nil {
				b.Fatal(err)
			}

			defer c.Close()

			pkt, err = c.ReadPacket()
			if err != nil {
				b.Fatal(err)
			}

			for i := 0; i < b.N; i++ {
				pkt := lob.New(body)
				err = c.WritePacket(pkt)
				if err != nil {
					b.Fatal(err)
				}

				// Give the other go routines some room to breath when GOMAXPROCS=1
				runtime.Gosched()
			}
		}()

		ident, err = A.LocalIdentity()
		if err != nil {
			b.Fatal(err)
		}

		c, err = B.Open(ident, "flood", false)
		if err != nil {
			b.Fatal(err)
		}

		defer c.Close()

		err = c.WritePacket(lob.New(nil))
		if err != nil {
			b.Fatal(err)
		}

		for {
			pkt, err = c.ReadPacket()
			if err == io.EOF {
				break
			}
			if err != nil {
				b.Fatal(err)
			}
			pkt.Free()
		}

		b.StopTimer()
	})
}