Update vendor (slack)

vendor/github.com/nlopes/slack/websocket.go

@@ -0,0 +1,99 @@
+package slack
+
+import (
+	"encoding/json"
+	"errors"
+	"time"
+
+	"golang.org/x/net/websocket"
+)
+
+const (
+	// MaxMessageTextLength is the current maximum message length in number of characters as defined here
+	// https://api.slack.com/rtm#limits
+	MaxMessageTextLength = 4000
+)
+
+// RTM represents a managed websocket connection. It also supports
+// all the methods of the `Client` type.
+//
+// Create this element with Client's NewRTM() or NewRTMWithOptions(*RTMOptions)
+type RTM struct {
+	idGen IDGenerator
+	pings map[int]time.Time
+
+	// Connection life-cycle
+	conn             *websocket.Conn
+	IncomingEvents   chan RTMEvent
+	outgoingMessages chan OutgoingMessage
+	killChannel      chan bool
+	disconnected     chan struct{} // disconnected is closed when Disconnect is invoked, regardless of connection state. Allows for ManagedConnection to not leak.
+	forcePing        chan bool
+	rawEvents        chan json.RawMessage
+	wasIntentional   bool
+	isConnected      bool
+
+	// Client is the main API, embedded
+	Client
+	websocketURL string
+
+	// UserDetails upon connection
+	info *Info
+
+	// useRTMStart should be set to true if you want to use
+	// rtm.start to connect to Slack, otherwise it will use
+	// rtm.connect
+	useRTMStart bool
+}
+
+// RTMOptions allows configuration of various options available for RTM messaging
+//
+// This structure will evolve in time so please make sure you are always using the
+// named keys for every entry available as per Go 1 compatibility promise adding fields
+// to this structure should not be considered a breaking change.
+type RTMOptions struct {
+	// UseRTMStart set to true in order to use rtm.start or false to use rtm.connect
+	// As of 11th July 2017 you should prefer setting this to false, see:
+	// https://api.slack.com/changelog/2017-04-start-using-rtm-connect-and-stop-using-rtm-start
+	UseRTMStart bool
+}
+
+// Disconnect and wait, blocking until a successful disconnection.
+func (rtm *RTM) Disconnect() error {
+	// this channel is always closed on disconnect. lets the ManagedConnection() function
+	// properly clean up.
+	close(rtm.disconnected)
+
+	if !rtm.isConnected {
+		return errors.New("Invalid call to Disconnect - Slack API is already disconnected")
+	}
+
+	rtm.killChannel <- true
+	return nil
+}
+
+// Reconnect only makes sense if you've successfully disconnectd with Disconnect().
+func (rtm *RTM) Reconnect() error {
+	logger.Println("RTM::Reconnect not implemented!")
+	return nil
+}
+
+// GetInfo returns the info structure received when calling
+// "startrtm", holding all channels, groups and other metadata needed
+// to implement a full chat client. It will be non-nil after a call to
+// StartRTM().
+func (rtm *RTM) GetInfo() *Info {
+	return rtm.info
+}
+
+// SendMessage submits a simple message through the websocket.  For
+// more complicated messages, use `rtm.PostMessage` with a complete
+// struct describing your attachments and all.
+func (rtm *RTM) SendMessage(msg *OutgoingMessage) {
+	if msg == nil {
+		rtm.Debugln("Error: Attempted to SendMessage(nil)")
+		return
+	}
+
+	rtm.outgoingMessages <- *msg
+}