Initial QSfera import

Server/vendor/github.com/segmentio/kafka-go/address.go

@@ -0,0 +1,64 @@
+package kafka
+
+import (
+	"net"
+	"strings"
+)
+
+// TCP constructs an address with the network set to "tcp".
+func TCP(address ...string) net.Addr { return makeNetAddr("tcp", address) }
+
+func makeNetAddr(network string, addresses []string) net.Addr {
+	switch len(addresses) {
+	case 0:
+		return nil // maybe panic instead?
+	case 1:
+		return makeAddr(network, addresses[0])
+	default:
+		return makeMultiAddr(network, addresses)
+	}
+}
+
+func makeAddr(network, address string) net.Addr {
+	return &networkAddress{
+		network: network,
+		address: canonicalAddress(address),
+	}
+}
+
+func makeMultiAddr(network string, addresses []string) net.Addr {
+	multi := make(multiAddr, len(addresses))
+	for i, address := range addresses {
+		multi[i] = makeAddr(network, address)
+	}
+	return multi
+}
+
+type networkAddress struct {
+	network string
+	address string
+}
+
+func (a *networkAddress) Network() string { return a.network }
+
+func (a *networkAddress) String() string { return a.address }
+
+type multiAddr []net.Addr
+
+func (m multiAddr) Network() string { return m.join(net.Addr.Network) }
+
+func (m multiAddr) String() string { return m.join(net.Addr.String) }
+
+func (m multiAddr) join(f func(net.Addr) string) string {
+	switch len(m) {
+	case 0:
+		return ""
+	case 1:
+		return f(m[0])
+	}
+	s := make([]string, len(m))
+	for i, a := range m {
+		s[i] = f(a)
+	}
+	return strings.Join(s, ",")
+}