Refactor displays to allow for centralized remote configuration.

web/placeholder_display.go

@@ -0,0 +1,67 @@
+// Copyright 2018 Team 254. All Rights Reserved.
+// Author: pat@patfairbank.com (Patrick Fairbank)
+//
+// Web routes for a placeholder display to be later configured by the server.
+
+package web
+
+import (
+	"fmt"
+	"github.com/Team254/cheesy-arena/field"
+	"github.com/Team254/cheesy-arena/model"
+	"github.com/Team254/cheesy-arena/websocket"
+	"net/http"
+)
+
+// Shows a random ID to visually identify the display so that it can be configured on the server.
+func (web *Web) placeholderDisplayHandler(w http.ResponseWriter, r *http.Request) {
+	if !web.userIsReader(w, r) {
+		return
+	}
+
+	// Generate a display ID and redirect if the client doesn't already have one.
+	displayId := r.URL.Query().Get("displayId")
+	if displayId == "" {
+		http.Redirect(w, r, fmt.Sprintf(r.URL.Path+"?displayId=%s", web.arena.NextDisplayId()), 302)
+		return
+	}
+
+	template, err := web.parseFiles("templates/placeholder_display.html")
+	if err != nil {
+		handleWebErr(w, err)
+		return
+	}
+	data := struct {
+		*model.EventSettings
+	}{web.arena.EventSettings}
+	err = template.ExecuteTemplate(w, "placeholder_display.html", data)
+	if err != nil {
+		handleWebErr(w, err)
+		return
+	}
+}
+
+// The websocket endpoint for sending configuration commands to the display.
+func (web *Web) placeholderDisplayWebsocketHandler(w http.ResponseWriter, r *http.Request) {
+	if !web.userIsReader(w, r) {
+		return
+	}
+
+	display, err := field.DisplayFromUrl(r.URL.Path, r.URL.Query())
+	if err != nil {
+		handleWebErr(w, err)
+		return
+	}
+	web.arena.RegisterDisplay(display)
+	defer web.arena.MarkDisplayDisconnected(display)
+
+	ws, err := websocket.NewWebsocket(w, r)
+	if err != nil {
+		handleWebErr(w, err)
+		return
+	}
+	defer ws.Close()
+
+	// Subscribe the websocket to the notifiers whose messages will be passed on to the client.
+	ws.HandleNotifiers(web.arena.DisplayConfigurationNotifier, web.arena.ReloadDisplaysNotifier)
+}