Removed half of the monitor plugins (#6224)

scripts/lua/modules/redis_api.lua

@@ -0,0 +1,90 @@
+--
+-- (C) 2019-21 - ntop.org
+--
+
+local redis_api = {}
+
+-- ##############################################
+
+local function getRedisStatus()
+    local redis = ntop.getCacheStatus()
+    local redis_info = redis["info"]
+    local res = {}
+ 
+    for _, k in pairs(redis_info:split("\r\n")) do
+       local k = k:split(":")
+ 
+       if k then
+      local v_k = k[1]
+      local v = tonumber(k[2]) or k[2]
+ 
+      res[v_k] = v
+       end
+    end
+ 
+ 
+    if redis["dbsize"] then
+       res["dbsize"] = redis["dbsize"]
+    end
+ 
+    return res
+end
+ 
+ -- ##############################################
+ 
+local function getHealth(redis_status)
+    local health = "green"
+ 
+    if ntop.isWindows() then
+        -- See Windows note in script.getStats()
+        return health
+    end
+ 
+    if redis_status["aof_enabled"] and redis_status["aof_enabled"] ~= 0 then
+        -- If here the use of Redis Append Only File (AOF) is enabled
+        -- so we should check for its errors
+        if redis_status["aof_last_bgrewrite_status"] ~= "ok" or redis_status["aof_last_write_status"] ~= "ok" then
+            health = "red"
+        end
+    end
+ 
+    if redis_status["rdb_last_bgsave_status"] ~= "ok" then
+        health = "red"
+    end
+ 
+    return health
+end
+ 
+-- ##############################################
+
+-- NOTE: on Windows, some stats are missing from script.getRedisStatus():
+--    - aof_last_bgrewrite_status
+--    - aof_last_write_status
+--    - rdb_last_bgsave_status
+--    - dbsize
+function redis_api.getStats()
+    local redis_status = getRedisStatus()
+
+    local res = {
+        -- used_memory_rss: Number of bytes that Redis allocated
+        -- as seen by the operating system (a.k.a resident set size).
+        -- This is the number reported by tools such as top(1) and ps(1)
+        memory = redis_status["used_memory_rss"],
+        -- The number of keys in the database
+        dbsize = redis_status["dbsize"],
+        -- Health
+        health = getHealth(redis_status)
+    }
+
+    return res
+end
+
+-- ###############################################
+
+function redis_api.redisTimeseriesEnabled()
+    return(ntop.getPref("ntopng.prefs.system_probes_timeseries") ~= "0")
+end
+
+-- ###############################################
+
+return redis_api