Add QoE pie chart to the dashboard

scripts/lua/rest/v2/get/interface/qoe/stats.lua

@@ -0,0 +1,55 @@
+--
+-- (C) 2013-21 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+require "lua_utils"
+local rest_utils = require("rest_utils")
+local stats_utils = require("stats_utils")
+local graph_utils = require "graph_utils"
+
+--
+-- Read statistics about nDPI application protocols on an interface
+-- Example: curl -u admin:admin -H "Content-Type: application/json" -d '{"ifid": "1"}' http://localhost:3000/lua/rest/v2/get/interface/qoe/stats.lua
+--
+-- NOTE: in case of invalid login, no error is returned but redirected to login
+--
+
+local rc = rest_utils.consts.success.ok
+local res = {}
+
+local ifid = _GET["ifid"]
+local collapse_stats = toboolean(_GET["collapse_stats"])
+
+if isEmptyString(ifid) then
+   rc = rest_utils.consts.err.invalid_interface
+   rest_utils.answer(rc)
+   return
+end
+
+interface.select(ifid)
+
+local stats = interface.getActiveFlowsStats()
+
+local js_formatter = "formatValue"
+
+if not stats or not stats.qoe then
+   rest_utils.answer(rest_utils.consts.err.internal_error)
+   return
+end
+
+for key, value in pairsByField(stats.qoe, "num", rev) do
+   res[#res + 1] = {
+      label = i18n("flow_details.qoe_" .. key .. "_label") or "",
+      value = value.num,
+      url = nil
+   }
+end
+
+if collapse_stats then
+  res = stats_utils.collapse_stats(res, 1, 3 --[[ threshold ]])
+end
+
+rest_utils.answer(rc, graph_utils.convert_pie_data(res, true, js_formatter))