Refactor and update RocketChat bridge

* Add support for editing/deleting messages
* Add support for uploading files
* Add support for avatars
* Use the Rocket.Chat.Go.SDK
* Use the rest and streaming api

vendor/github.com/gopackage/ddp/ddp.go

@@ -0,0 +1,79 @@
+// Package ddp implements the MeteorJS DDP protocol over websockets. Fallback
+// to longpolling is NOT supported (and is not planned on ever being supported
+// by this library). We will try to model the library after `net/http` - right
+// now the library is barebones and doesn't provide the pluggability of http.
+// However, that's the goal for the package eventually.
+package ddp
+
+import (
+	"fmt"
+	"log"
+	"sync"
+	"time"
+)
+
+// debugLog is true if we should log debugging information about the connection
+var debugLog = true
+
+// The main file contains common utility types.
+
+// -------------------------------------------------------------------
+
+// idManager provides simple incrementing IDs for ddp messages.
+type idManager struct {
+	// nextID is the next ID for API calls
+	nextID uint64
+	// idMutex is a mutex to protect ID updates
+	idMutex *sync.Mutex
+}
+
+// newidManager creates a new instance and sets up resources.
+func newidManager() *idManager {
+	return &idManager{idMutex: new(sync.Mutex)}
+}
+
+// newID issues a new ID for use in calls.
+func (id *idManager) newID() string {
+	id.idMutex.Lock()
+	next := id.nextID
+	id.nextID++
+	id.idMutex.Unlock()
+	return fmt.Sprintf("%x", next)
+}
+
+// -------------------------------------------------------------------
+
+// pingTracker tracks in-flight pings.
+type pingTracker struct {
+	handler func(error)
+	timeout time.Duration
+	timer   *time.Timer
+}
+
+// -------------------------------------------------------------------
+
+// Call represents an active RPC call.
+type Call struct {
+	ID            string      // The uuid for this method call
+	ServiceMethod string      // The name of the service and method to call.
+	Args          interface{} // The argument to the function (*struct).
+	Reply         interface{} // The reply from the function (*struct).
+	Error         error       // After completion, the error status.
+	Done          chan *Call  // Strobes when call is complete.
+	Owner         *Client     // Client that owns the method call
+}
+
+// done removes the call from any owners and strobes the done channel with itself.
+func (call *Call) done() {
+	delete(call.Owner.calls, call.ID)
+	select {
+	case call.Done <- call:
+		// ok
+	default:
+		// We don't want to block here.  It is the caller's responsibility to make
+		// sure the channel has enough buffer space. See comment in Go().
+		if debugLog {
+			log.Println("rpc: discarding Call reply due to insufficient Done chan capacity")
+		}
+	}
+}