Adds new REST API v2/

Addresses #5269

scripts/lua/rest/v2/get/interface/l7/stats.lua

@@ -0,0 +1,124 @@
+--
+-- (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")
+
+--
+-- Read statistics about nDPI application protocols on an interface
+-- Example: curl -u admin:admin -H "Content-Type: application/json" -d '{"ifid": "1", "ndpistats_mode": "count"}' http://localhost:3000/lua/rest/v2/get/interface/l7/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 ndpistats_mode = _GET["ndpistats_mode"]
+local breed = _GET["breed"]
+local ndpi_category = _GET["ndpi_category"]
+
+if isEmptyString(ifid) then
+   rc = rest_utils.consts.err.invalid_interface
+   rest_utils.answer(rc)
+   return
+end
+
+local show_breed = false
+if breed == "true" then
+   show_breed = true
+end
+
+local show_ndpi_category = false
+if ndpi_category == "true" then
+   show_ndpi_category = true
+end
+
+interface.select(ifid)
+
+local ndpi_protos = interface.getnDPIProtocols()
+
+local function getAppUrl(app)
+   if ndpi_protos[app] ~= nil then
+      return ntop.getHttpPrefix().."/lua/flows_stats.lua?application="..app
+   end
+   return nil
+end
+
+local stats
+local tot = 0
+
+if ndpistats_mode == "sinceStartup" then
+   stats = interface.getStats()
+   tot = stats.stats.bytes
+elseif ndpistats_mode == "count" then
+   stats = interface.getnDPIFlowsCount()
+else
+   rest_utils.answer(rest_utils.consts.err.invalid_args)
+   return
+end
+
+if stats == nil then
+   rest_utils.answer(rest_utils.consts.err.internal_error)
+   return
+end
+
+if(ndpistats_mode == "count") then
+   tot = 0
+
+   for k, v in pairs(stats) do
+      tot = tot + v
+      stats[k] = tonumber(v)
+   end
+
+   local threshold = (tot * 3) / 100
+   local num = 0
+   for k, v in pairsByValues(stats, rev) do
+      if((num < 5) and (v > threshold)) then
+         res[#res + 1] = {
+            label = k,
+            value = v,
+            url = getAppUrl(k),
+         }
+         num = num + 1
+         tot = tot - v
+      else
+         break
+      end
+   end
+
+   if(tot > 0) then
+      res[#res + 1] = {
+         label = i18n("other"),
+         value = tot,
+      }
+   elseif(num == 0) then
+      res[#res + 1] = {
+         label = i18n("no_flows"),
+         value = 0,
+      }
+   end
+
+   rest_utils.answer(rc, res)
+   return
+end
+
+local _ifstats = computeL7Stats(stats, show_breed, show_ndpi_category)
+
+for key, value in pairsByValues(_ifstats, rev) do
+
+   res[#res + 1] = {
+      label = key,
+      value = value,
+      url = getAppUrl(key),
+   }
+end
+
+local collapsed = stats_utils.collapse_stats(res, 1, 3 --[[ threshold ]])
+rest_utils.answer(rc, collapsed)