Upgrade dependencies

vendor/github.com/eclipse/paho.mqtt.golang/netconn.go

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2013 IBM Corp.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Seth Hoenig
+ *    Allan Stockdill-Mander
+ *    Mike Robertson
+ */
+
+package mqtt
+
+import (
+	"crypto/tls"
+	"errors"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	"golang.org/x/net/proxy"
+)
+
+//
+// This just establishes the network connection; once established the type of connection should be irrelevant
+//
+
+// openConnection opens a network connection using the protocol indicated in the URL. Does not carry out any MQTT specific handshakes
+func openConnection(uri *url.URL, tlsc *tls.Config, timeout time.Duration, headers http.Header, websocketOptions *WebsocketOptions) (net.Conn, error) {
+	switch uri.Scheme {
+	case "ws":
+		conn, err := NewWebsocket(uri.String(), nil, timeout, headers, websocketOptions)
+		return conn, err
+	case "wss":
+		conn, err := NewWebsocket(uri.String(), tlsc, timeout, headers, websocketOptions)
+		return conn, err
+	case "mqtt", "tcp":
+		allProxy := os.Getenv("all_proxy")
+		if len(allProxy) == 0 {
+			conn, err := net.DialTimeout("tcp", uri.Host, timeout)
+			if err != nil {
+				return nil, err
+			}
+			return conn, nil
+		}
+		proxyDialer := proxy.FromEnvironment()
+
+		conn, err := proxyDialer.Dial("tcp", uri.Host)
+		if err != nil {
+			return nil, err
+		}
+		return conn, nil
+	case "unix":
+		conn, err := net.DialTimeout("unix", uri.Host, timeout)
+		if err != nil {
+			return nil, err
+		}
+		return conn, nil
+	case "ssl", "tls", "mqtts", "mqtt+ssl", "tcps":
+		allProxy := os.Getenv("all_proxy")
+		if len(allProxy) == 0 {
+			conn, err := tls.DialWithDialer(&net.Dialer{Timeout: timeout}, "tcp", uri.Host, tlsc)
+			if err != nil {
+				return nil, err
+			}
+			return conn, nil
+		}
+		proxyDialer := proxy.FromEnvironment()
+
+		conn, err := proxyDialer.Dial("tcp", uri.Host)
+		if err != nil {
+			return nil, err
+		}
+
+		tlsConn := tls.Client(conn, tlsc)
+
+		err = tlsConn.Handshake()
+		if err != nil {
+			conn.Close()
+			return nil, err
+		}
+
+		return tlsConn, nil
+	}
+	return nil, errors.New("unknown protocol")
+}