Add rest/v1/get/host/l7/stats.lua REST API (#3953)

scripts/lua/rest/v1/get/host/l7/stats.lua

@@ -0,0 +1,114 @@
+--
+-- (C) 2013-20 - 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")
+
+--
+-- Read statistics about nDPI application protocols for a hsot
+-- Example: curl -u admin:admin -d '{"ifid": "1"}' http://localhost:3000/lua/rest/v1/get/host/l7/stats.lua
+--
+-- NOTE: in case of invalid login, no error is returned but redirected to login
+--
+
+sendHTTPContentTypeHeader('text/html')
+
+local rc = rest_utils.consts_ok
+local res = {}
+
+local ifid = _GET["ifid"]
+local host_info = url2hostinfo(_GET)
+local breed = _GET["breed"]
+local ndpi_category = _GET["ndpi_category"]
+
+if isEmptyString(ifid) then
+   rc = rest_utils.consts_invalid_interface
+   print(rest_utils.rc(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 tot = 0
+
+local stats = interface.getHostInfo(host_info["host"], host_info["vlan"])
+
+if stats == nil then
+   print(rest_utils.rc(rest_utils.consts_not_found))
+   return
+end
+
+tot = stats["bytes.sent"] + stats["bytes.rcvd"]
+
+local _ifstats = computeL7Stats(stats)
+
+-- Print up to this number of entries
+local max_num_entries = 5
+
+-- Print entries whose value >= 3% of the total
+local threshold = (tot * 3) / 100
+
+local num = 0
+local accumulate = 0
+
+for key, value in pairsByValues(_ifstats, rev) do
+   if(value < threshold) then
+      break
+   end
+
+   local duration = 0
+
+   if(stats["ndpi"][key] ~= nil) then
+      duration = stats["ndpi"][key]["duration"]
+   end
+
+   res[#res + 1] = {
+      label = key,
+      value = value,
+      duration = duration,
+   }
+
+   accumulate = accumulate + value
+   num = num + 1
+
+   if(num == max_num_entries) then
+      break
+   end
+end
+
+if(tot == 0) then
+   tot = 1
+end
+
+-- In case there is some leftover do print it as "Other"
+if(accumulate < tot) then
+   res[#res + 1] = {
+      label = i18n("other"),
+      value = (tot-accumulate),
+   }
+end
+
+print(rest_utils.rc(rc, res))