Implement the websocket adaptor, a version of kataras/go-websocket, and refactor all of the previous websocket examples.

https://github.com/kataras/go-websocket/issues/27

Former-commit-id: 0b7e52e0a61150a8bba973ef653986d8b3ddd26b

adaptors/websocket/websocket.go

@@ -0,0 +1,62 @@
+// Package websocket provides an easy way to setup server and client side rich websocket experience for Iris
+package websocket
+
+import (
+	"strings"
+
+	"gopkg.in/kataras/iris.v6"
+)
+
+// New returns a new websocket server policy adaptor.
+func New(cfg Config) Server {
+	return &server{
+		config: cfg.Validate(),
+		rooms:  make(map[string][]string, 0),
+		onConnectionListeners: make([]ConnectionFunc, 0),
+	}
+}
+
+func fixPath(s string) string {
+	if s == "" {
+		return ""
+	}
+
+	if s[0] != '/' {
+		s = "/" + s
+	}
+
+	s = strings.Replace(s, "//", "/", -1)
+	return s
+}
+
+// Adapt implements the iris' adaptor, it adapts the websocket server to an Iris station.
+func (s *server) Adapt(frame *iris.Policies) {
+	// bind the server's Handler to Iris at Boot state
+	evt := iris.EventPolicy{
+		Boot: func(f *iris.Framework) {
+			wsPath := fixPath(s.config.Endpoint)
+			if wsPath == "" {
+				f.Log(iris.DevMode, "websocket's configuration field 'Endpoint' cannot be empty, websocket server stops")
+				return
+			}
+
+			wsClientSidePath := fixPath(s.config.ClientSourcePath)
+			if wsClientSidePath == "" {
+				f.Log(iris.DevMode, "websocket's configuration field 'ClientSourcePath' cannot be empty, websocket server stops")
+				return
+			}
+
+			// set the routing for client-side source (javascript) (optional)
+			clientSideLookupName := "iris-websocket-client-side"
+			wsHandler := s.Handler()
+			f.Get(wsPath, wsHandler)
+			// check if client side doesn't already exists
+			if f.Routes().Lookup(clientSideLookupName) == nil {
+				// serve the client side on domain:port/iris-ws.js
+				f.StaticContent(wsClientSidePath, "application/javascript", ClientSource).ChangeName(clientSideLookupName)
+			}
+		},
+	}
+
+	evt.Adapt(frame)
+}