Merge pull request #1653 from guidosarducci/master-fix-apcups-statistics

[RFC] luci-app-statistics: only graph data supported by APC UPS

applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/apcups.lua

@@ -3,25 +3,80 @@
 
 module("luci.statistics.rrdtool.definitions.apcups",package.seeall)
 
-function rrdargs( graph, plugin, plugin_instance, dtype )
+function rrdargs( graph, plugin, plugin_instance )
+
+	local lu = require("luci.util")
+	local rv = { }
+
+	-- Types and instances supported by APC UPS
+	-- e.g. ups_types -> { 'timeleft', 'charge', 'percent', 'voltage' }
+	-- e.g. ups_inst['voltage'] -> { 'input', 'battery' }
+
+	local ups_types = graph.tree:data_types( plugin, plugin_instance )
+
+	local ups_inst = {}
+	for _, t in ipairs(ups_types) do
+		ups_inst[t] = graph.tree:data_instances( plugin, plugin_instance, t )
+	end
+
+
+    -- Check if hash table or array is empty or nil-filled
+
+	local function empty( t )
+		for _, v in pairs(t) do
+			if type(v) then return false end
+		end
+		return true
+	end
+
+
+	-- Append graph definition but only types/instances which are
+	-- supported and available to the plugin and UPS.
+
+	local function add_supported( t, defs )
+		local def_inst = defs['data']['instances']
+
+		if type(def_inst) == "table" then
+			for k, v in pairs( def_inst ) do
+				if lu.contains( ups_types, k) then
+					for j = #v, 1, -1 do
+						if not lu.contains( ups_inst[k], v[j] ) then
+							table.remove( v, j )
+						end
+					end
+					if #v == 0 then
+						def_inst[k] = nil  -- can't assign v: immutable
+					end
+				else
+					def_inst[k] = nil  -- can't assign v: immutable
+				end
+			end
+			if empty(def_inst) then return end
+		end
+		table.insert( t, defs )
+	end
+
+
+    -- Graph definitions for APC UPS measurements MUST use only 'instances':
+    -- e.g. instances = { voltage = {  "input", "output" } }
 
 	local voltagesdc = {
 		title = "%H: Voltages on APC UPS - Battery",
 		vlabel = "Volts DC",
-    alt_autoscale = true,
+		alt_autoscale = true,
 		number_format = "%5.1lfV",
 		data = {
 			instances = {
 				voltage = { "battery" }
 			},
-
 			options = {
 				voltage = { title = "Battery voltage", noarea=true }
 			}
 		}
 	}
+	add_supported( rv, voltagesdc )
 
-	local voltages = {
+	local voltagesac = {
 		title = "%H: Voltages on APC UPS - AC",
 		vlabel = "Volts AC",
 		alt_autoscale = true,
@@ -30,13 +85,13 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
 			instances = {
 				voltage = {  "input", "output" }
 			},
-
 			options = {
 				voltage_output  = { color = "00e000", title = "Output voltage", noarea=true, overlay=true },
 				voltage_input   = { color = "ffb000", title = "Input voltage", noarea=true, overlay=true }
 			}
 		}
 	}
+	add_supported( rv, voltagesac )
 
 	local percentload = {
 		title = "%H: Load on APC UPS ",
@@ -45,17 +100,15 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
 		y_max = "100",
 		number_format = "%5.1lf%%",
 		data = {
-			sources = {
-				percent_load = { "value" }
-			},
 			instances = {
-				percent = "load"
+				percent = { "load" }
 			},
 			options = {
 				percent_load = { color = "00ff00", title = "Load level"  }
 			}
 		}
 	}
+	add_supported( rv, percentload )
 
 	local charge_percent = {
 		title = "%H: Battery charge on APC UPS ",
@@ -64,54 +117,59 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
 		y_max = "100",
 		number_format = "%5.1lf%%",
 		data = {
-			types = { "charge" },
+			instances = {
+				charge = { "" }
+			},
 			options = {
 				charge = { color = "00ff0b", title = "Charge level"  }
 			}
 		}
 	}
+	add_supported( rv, charge_percent )
 
 	local temperature = {
 		title = "%H: Battery temperature on APC UPS ",
 		vlabel = "\176C",
 		number_format = "%5.1lf\176C",
 		data = {
-			types = { "temperature" },
+			instances = {
+				temperature = { "" }
+			},
 			options = {
 				temperature = { color = "ffb000", title = "Battery temperature" } }
 		}
 	}
+	add_supported( rv, temperature )
 
 	local timeleft = {
 		title = "%H: Time left on APC UPS ",
 		vlabel = "Minutes",
 		number_format = "%.1lfm",
 		data = {
-			sources = {
-				timeleft = { "value" }
+			instances = {
+				timeleft = { "" }
 			},
 			options = {
 				timeleft = { color = "0000ff", title = "Time left" }
 			}
 		}
 	}
+	add_supported( rv, timeleft )
 
 	local frequency = {
 		title = "%H: Incoming line frequency on APC UPS ",
 		vlabel = "Hz",
 		number_format = "%5.0lfhz",
 		data = {
-			sources = {
-				frequency_input = { "value" }
-			},
 			instances = {
-				frequency = "frequency"
+				frequency = { "input" }
 			},
 			options = {
-				frequency_frequency = { color = "000fff", title = "Line frequency" }
+				frequency_input = { color = "000fff", title = "Line frequency" }
 			}
 		}
 	}
+	add_supported( rv, frequency )
 
-	return { voltages, voltagesdc, percentload, charge_percent, temperature, timeleft, frequency }
+	return rv
 end