cleanup: rename package and vendor dependencies for old go versions

Fixes #8 and begins to address deployability.

vendor/github.com/pebbe/zmq4/utils.go

@@ -0,0 +1,206 @@
+package zmq4
+
+import (
+	"fmt"
+)
+
+/*
+Send multi-part message on socket.
+
+Any `[]string' or `[][]byte' is split into separate `string's or `[]byte's
+
+Any other part that isn't a `string' or `[]byte' is converted
+to `string' with `fmt.Sprintf("%v", part)'.
+
+Returns total bytes sent.
+*/
+func (soc *Socket) SendMessage(parts ...interface{}) (total int, err error) {
+	return soc.sendMessage(0, parts...)
+}
+
+/*
+Like SendMessage(), but adding the DONTWAIT flag.
+*/
+func (soc *Socket) SendMessageDontwait(parts ...interface{}) (total int, err error) {
+	return soc.sendMessage(DONTWAIT, parts...)
+}
+
+func (soc *Socket) sendMessage(dontwait Flag, parts ...interface{}) (total int, err error) {
+
+	var last int
+PARTS:
+	for last = len(parts) - 1; last >= 0; last-- {
+		switch t := parts[last].(type) {
+		case []string:
+			if len(t) > 0 {
+				break PARTS
+			}
+		case [][]byte:
+			if len(t) > 0 {
+				break PARTS
+			}
+		default:
+			break PARTS
+		}
+	}
+
+	opt := SNDMORE | dontwait
+	for i := 0; i <= last; i++ {
+		if i == last {
+			opt = dontwait
+		}
+		switch t := parts[i].(type) {
+		case []string:
+			opt = SNDMORE | dontwait
+			n := len(t) - 1
+			for j, s := range t {
+				if j == n && i == last {
+					opt = dontwait
+				}
+				c, e := soc.Send(s, opt)
+				if e == nil {
+					total += c
+				} else {
+					return -1, e
+				}
+			}
+		case [][]byte:
+			opt = SNDMORE | dontwait
+			n := len(t) - 1
+			for j, b := range t {
+				if j == n && i == last {
+					opt = dontwait
+				}
+				c, e := soc.SendBytes(b, opt)
+				if e == nil {
+					total += c
+				} else {
+					return -1, e
+				}
+			}
+		case string:
+			c, e := soc.Send(t, opt)
+			if e == nil {
+				total += c
+			} else {
+				return -1, e
+			}
+		case []byte:
+			c, e := soc.SendBytes(t, opt)
+			if e == nil {
+				total += c
+			} else {
+				return -1, e
+			}
+		default:
+			c, e := soc.Send(fmt.Sprintf("%v", t), opt)
+			if e == nil {
+				total += c
+			} else {
+				return -1, e
+			}
+		}
+	}
+	return
+}
+
+/*
+Receive parts as message from socket.
+
+Returns last non-nil error code.
+*/
+func (soc *Socket) RecvMessage(flags Flag) (msg []string, err error) {
+	msg = make([]string, 0)
+	for {
+		s, e := soc.Recv(flags)
+		if e == nil {
+			msg = append(msg, s)
+		} else {
+			return msg[0:0], e
+		}
+		more, e := soc.GetRcvmore()
+		if e == nil {
+			if !more {
+				break
+			}
+		} else {
+			return msg[0:0], e
+		}
+	}
+	return
+}
+
+/*
+Receive parts as message from socket.
+
+Returns last non-nil error code.
+*/
+func (soc *Socket) RecvMessageBytes(flags Flag) (msg [][]byte, err error) {
+	msg = make([][]byte, 0)
+	for {
+		b, e := soc.RecvBytes(flags)
+		if e == nil {
+			msg = append(msg, b)
+		} else {
+			return msg[0:0], e
+		}
+		more, e := soc.GetRcvmore()
+		if e == nil {
+			if !more {
+				break
+			}
+		} else {
+			return msg[0:0], e
+		}
+	}
+	return
+}
+
+/*
+Receive parts as message from socket, including metadata.
+
+Metadata is picked from the first message part.
+
+For details about metadata, see RecvWithMetadata().
+
+Returns last non-nil error code.
+*/
+func (soc *Socket) RecvMessageWithMetadata(flags Flag, properties ...string) (msg []string, metadata map[string]string, err error) {
+	b, p, err := soc.RecvMessageBytesWithMetadata(flags, properties...)
+	m := make([]string, len(b))
+	for i, bt := range b {
+		m[i] = string(bt)
+	}
+	return m, p, err
+}
+
+/*
+Receive parts as message from socket, including metadata.
+
+Metadata is picked from the first message part.
+
+For details about metadata, see RecvBytesWithMetadata().
+
+Returns last non-nil error code.
+*/
+func (soc *Socket) RecvMessageBytesWithMetadata(flags Flag, properties ...string) (msg [][]byte, metadata map[string]string, err error) {
+	bb := make([][]byte, 0)
+	b, p, err := soc.RecvBytesWithMetadata(flags, properties...)
+	if err != nil {
+		return bb, p, err
+	}
+	for {
+		bb = append(bb, b)
+
+		var more bool
+		more, err = soc.GetRcvmore()
+		if err != nil || !more {
+			break
+		}
+		b, err = soc.RecvBytes(flags)
+		if err != nil {
+			break
+		}
+	}
+	return bb, p, err
+}