applications/luci-statistics/luasrc/statistics/rrdtool.lua

   1 --[[
   2
   3 Luci statistics - rrdtool interface library / diagram model interpreter
   4 (c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
   5
   6 Licensed under the Apache License, Version 2.0 (the "License");
   7 you may not use this file except in compliance with the License.
   8 You may obtain a copy of the License at
   9
  10         http://www.apache.org/licenses/LICENSE-2.0
  11
  12 $Id$
  13
  14 ]]--
  15
  16 module("luci.statistics.rrdtool", package.seeall)
  17
  18 require("luci.statistics.datatree")
  19 require("luci.statistics.rrdtool.colors")
  20 require("luci.statistics.i18n")
  21 require("luci.model.uci")
  22 require("luci.util")
  23 require("luci.sys")
  24
  25 local fs = require "nixio.fs"
  26
  27
  28 Graph = luci.util.class()
  29
  30 function Graph.__init__( self, timespan, opts )
  31
  32         opts = opts or { }
  33
  34         local uci = luci.model.uci.cursor()
  35         local sections = uci:get_all( "luci_statistics" )
  36
  37         -- options
  38         opts.timespan  = timespan       or sections.rrdtool.default_timespan or 900
  39         opts.rrasingle = opts.rrasingle or ( sections.collectd_rrdtool.RRASingle == "1" )
  40         opts.host      = opts.host      or sections.collectd.Hostname        or luci.sys.hostname()
  41         opts.width     = opts.width     or sections.rrdtool.image_width      or 400
  42         opts.rrdpath   = opts.rrdpath   or sections.collectd_rrdtool.DataDir or "/tmp/rrd"
  43         opts.imgpath   = opts.imgpath   or sections.rrdtool.image_path       or "/tmp/rrdimg"
  44         opts.rrdpath   = opts.rrdpath:gsub("/$","")
  45         opts.imgpath   = opts.imgpath:gsub("/$","")
  46
  47         -- helper classes
  48         self.colors = luci.statistics.rrdtool.colors.Instance()
  49         self.tree   = luci.statistics.datatree.Instance(opts.host)
  50         self.i18n   = luci.statistics.i18n.Instance( self )
  51
  52         -- rrdtool default args
  53         self.args = {
  54                 "-a", "PNG",
  55                 "-s", "NOW-" .. opts.timespan,
  56                 "-w", opts.width
  57         }
  58
  59         -- store options
  60         self.opts = opts
  61 end
  62
  63 function Graph._mkpath( self, plugin, plugin_instance, dtype, dtype_instance )
  64         local t = self.opts.host .. "/" .. plugin
  65         if type(plugin_instance) == "string" and plugin_instance:len() > 0 then
  66                 t = t .. "-" .. plugin_instance
  67         end
  68         t = t .. "/" .. dtype
  69         if type(dtype_instance) == "string" and dtype_instance:len() > 0 then
  70                 t = t .. "-" .. dtype_instance
  71         end
  72         return t
  73 end
  74
  75 function Graph.mkrrdpath( self, ... )
  76         return string.format( "%s/%s.rrd", self.opts.rrdpath, self:_mkpath( ... ) )
  77 end
  78
  79 function Graph.mkpngpath( self, ... )
  80         return string.format( "%s/%s.%i.png", self.opts.imgpath, self:_mkpath( ... ), self.opts.timespan )
  81 end
  82
  83 function Graph.strippngpath( self, path )
  84         return path:sub( self.opts.imgpath:len() + 2 )
  85 end
  86
  87 function Graph._forcelol( self, list )
  88         if type(list[1]) ~= "table" then
  89                 return( { list } )
  90         end
  91         return( list )
  92 end
  93
  94 function Graph._rrdtool( self, def, rrd )
  95
  96         -- prepare directory
  97         local dir = def[1]:gsub("/[^/]+$","")
  98         fs.mkdirr( dir )
  99
 100         -- construct commandline
 101         local cmdline = "rrdtool graph"
 102
 103         -- copy default arguments to def stack
 104         for i, opt in ipairs(self.args) do
 105                 table.insert( def, 1 + i, opt )
 106         end
 107
 108         -- construct commandline from def stack
 109         for i, opt in ipairs(def) do
 110                 opt = opt .. ""    -- force string
 111
 112                 if rrd then
 113                         opt = opt:gsub( "{file}", rrd )
 114                 end
 115
 116                 if opt:match("[^%w]") then
 117                         cmdline = cmdline .. " '" .. opt .. "'"
 118                 else
 119                         cmdline = cmdline .. " " .. opt
 120                 end
 121         end
 122
 123         -- execute rrdtool
 124         local rrdtool = io.popen( cmdline )
 125         rrdtool:close()
 126 end
 127
 128 function Graph._generic( self, opts, plugin, plugin_instance, dtype, index )
 129
 130         -- generated graph defs
 131         local defs = { }
 132
 133         -- internal state variables
 134         local _args         = { }
 135         local _sources      = { }
 136         local _stack_neg    = { }
 137         local _stack_pos    = { }
 138         local _longest_name = 0
 139         local _has_totals   = false
 140
 141         -- some convenient aliases
 142         local _ti           = table.insert
 143         local _sf           = string.format
 144
 145         -- local helper: append a string.format() formatted string to given table
 146         function _tif( list, fmt, ... )
 147                 table.insert( list, string.format( fmt, ... ) )
 148         end
 149
 150         -- local helper: create definitions for min, max, avg and create *_nnl (not null) variable from avg
 151         function __def(source)
 152
 153                 local inst = source.sname
 154                 local rrd  = source.rrd
 155                 local ds   = source.ds
 156
 157                 if not ds or ds:len() == 0 then ds = "value" end
 158
 159                 _tif( _args, "DEF:%s_avg=%s:%s:AVERAGE", inst, rrd, ds )
 160
 161                 if not self.opts.rrasingle then
 162                         _tif( _args, "DEF:%s_min=%s:%s:MIN", inst, rrd, ds )
 163                         _tif( _args, "DEF:%s_max=%s:%s:MAX", inst, rrd, ds )
 164                 end
 165
 166                 _tif( _args, "CDEF:%s_nnl=%s_avg,UN,0,%s_avg,IF", inst, inst, inst )
 167         end
 168
 169         -- local helper: create cdefs depending on source options like flip and overlay
 170         function __cdef(source)
 171
 172                 local prev
 173
 174                 -- find previous source, choose stack depending on flip state
 175                 if source.flip then
 176                         prev = _stack_neg[#_stack_neg]
 177                 else
 178                         prev = _stack_pos[#_stack_pos]
 179                 end
 180
 181                 -- is first source in stack or overlay source: source_stk = source_nnl
 182                 if not prev or source.overlay then
 183                         -- create cdef statement
 184                         _tif( _args, "CDEF:%s_stk=%s_nnl", source.sname, source.sname )
 185
 186                 -- is subsequent source without overlay: source_stk = source_nnl + previous_stk
 187                 else
 188                         -- create cdef statement
 189                         _tif( _args, "CDEF:%s_stk=%s_nnl,%s_stk,+", source.sname, source.sname, prev )
 190                 end
 191
 192                 -- create multiply by minus one cdef if flip is enabled
 193                 if source.flip then
 194
 195                         -- create cdef statement: source_stk = source_stk * -1
 196                         _tif( _args, "CDEF:%s_neg=%s_stk,-1,*", source.sname, source.sname )
 197
 198                         -- push to negative stack if overlay is disabled
 199                         if not source.overlay then
 200                                 _ti( _stack_neg, source.sname )
 201                         end
 202
 203                 -- no flipping, push to positive stack if overlay is disabled
 204                 elseif not source.overlay then
 205
 206                         -- push to positive stack
 207                         _ti( _stack_pos, source.sname )
 208                 end
 209
 210                 -- calculate total amount of data if requested
 211                 if source.total then
 212                         _tif( _args,
 213                                 "CDEF:%s_avg_sample=%s_avg,UN,0,%s_avg,IF,sample_len,*",
 214                                 source.sname, source.sname, source.sname
 215                         )
 216
 217                         _tif( _args,
 218                                 "CDEF:%s_avg_sum=PREV,UN,0,PREV,IF,%s_avg_sample,+",
 219                                 source.sname, source.sname, source.sname
 220                         )
 221                 end
 222         end
 223
 224         -- local helper: create cdefs required for calculating total values
 225         function __cdef_totals()
 226                 if _has_totals then
 227                         _tif( _args, "CDEF:mytime=%s_avg,TIME,TIME,IF", _sources[1].sname    )
 228                         _ti(  _args, "CDEF:sample_len_raw=mytime,PREV(mytime),-"             )
 229                         _ti(  _args, "CDEF:sample_len=sample_len_raw,UN,0,sample_len_raw,IF" )
 230                 end
 231         end
 232
 233         -- local helper: create line and area statements
 234         function __line(source)
 235
 236                 local line_color
 237                 local area_color
 238                 local legend
 239                 local var
 240
 241                 -- find colors: try source, then opts.colors; fall back to random color
 242                 if type(source.color) == "string" then
 243                         line_color = source.color
 244                         area_color = self.colors:from_string( line_color )
 245                 elseif type(opts.colors[source.name:gsub("[^%w]","_")]) == "string" then
 246                         line_color = opts.colors[source.name:gsub("[^%w]","_")]
 247                         area_color = self.colors:from_string( line_color )
 248                 else
 249                         area_color = self.colors:random()
 250                         line_color = self.colors:to_string( area_color )
 251                 end
 252
 253                 -- derive area background color from line color
 254                 area_color = self.colors:to_string( self.colors:faded( area_color ) )
 255
 256                 -- choose source_stk or source_neg variable depending on flip state
 257                 if source.flip then
 258                         var = "neg"
 259                 else
 260                         var = "stk"
 261                 end
 262
 263                 -- create legend
 264                 legend = _sf( "%-" .. _longest_name .. "s", source.title )
 265
 266                 -- create area if not disabled
 267                 if not source.noarea then
 268                         _tif( _args, "AREA:%s_%s#%s", source.sname, var, area_color )
 269                 end
 270
 271                 -- create line1 statement
 272                 _tif( _args, "LINE%d:%s_%s#%s:%s",
 273                         source.noarea and 2 or 1,
 274                         source.sname, var, line_color, legend )
 275         end
 276
 277         -- local helper: create gprint statements
 278         function __gprint(source)
 279
 280                 local numfmt = opts.number_format or "%6.1lf"
 281                 local totfmt = opts.totals_format or "%5.1lf%s"
 282
 283                 -- don't include MIN if rrasingle is enabled
 284                 if not self.opts.rrasingle then
 285                         _tif( _args, "GPRINT:%s_min:MIN:\tMin\\: %s", source.sname, numfmt )
 286                 end
 287
 288                 -- always include AVERAGE
 289                 _tif( _args, "GPRINT:%s_avg:AVERAGE:\tAvg\\: %s", source.sname, numfmt )
 290
 291                 -- don't include MAX if rrasingle is enabled
 292                 if not self.opts.rrasingle then
 293                         _tif( _args, "GPRINT:%s_max:MAX:\tMax\\: %s", source.sname, numfmt )
 294                 end
 295
 296                 -- include total count if requested else include LAST
 297                 if source.total then
 298                         _tif( _args, "GPRINT:%s_avg_sum:LAST:(ca. %s Total)\\l", source.sname, totfmt )
 299                 else
 300                         _tif( _args, "GPRINT:%s_avg:LAST:\tLast\\: %s\\l", source.sname, numfmt )
 301                 end
 302         end
 303
 304
 305         --
 306         -- find all data sources
 307         --
 308
 309         -- find data types
 310         local data_types
 311
 312         if dtype then
 313                 data_types = { dtype }
 314         else
 315                 data_types = opts.data.types or { }
 316         end
 317
 318         if not ( dtype or opts.data.types ) then
 319                 if opts.data.instances then
 320                         for k, v in pairs(opts.data.instances) do
 321                                 _ti( data_types, k )
 322                         end
 323                 elseif opts.data.sources then
 324                         for k, v in pairs(opts.data.sources) do
 325                                 _ti( data_types, k )
 326                         end
 327                 end
 328         end
 329
 330
 331         -- iterate over data types
 332         for i, dtype in ipairs(data_types) do
 333
 334                 -- find instances
 335
 336                 local data_instances
 337
 338                 if not opts.per_instance then
 339                         if type(opts.data.instances) == "table" and type(opts.data.instances[dtype]) == "table" then
 340                                 data_instances = opts.data.instances[dtype]
 341                         else
 342                                 data_instances = self.tree:data_instances( plugin, plugin_instance, dtype )
 343                         end
 344                 end
 345
 346                 if type(data_instances) ~= "table" or #data_instances == 0 then data_instances = { "" } end
 347
 348
 349                 -- iterate over data instances
 350                 for i, dinst in ipairs(data_instances) do
 351
 352                         -- construct combined data type / instance name
 353                         local dname = dtype
 354
 355                         if dinst:len() > 0 then
 356                                 dname = dname .. "_" .. dinst
 357                         end
 358
 359
 360                         -- find sources
 361                         local data_sources = { "value" }
 362
 363                         if type(opts.data.sources) == "table" then
 364                                 if type(opts.data.sources[dname]) == "table" then
 365                                         data_sources = opts.data.sources[dname]
 366                                 elseif type(opts.data.sources[dtype]) == "table" then
 367                                         data_sources = opts.data.sources[dtype]
 368                                 end
 369                         end
 370
 371
 372                         -- iterate over data sources
 373                         for i, dsource in ipairs(data_sources) do
 374
 375                                 local dsname  = dtype .. "_" .. dinst:gsub("[^%w]","_") .. "_" .. dsource
 376                                 local altname = dtype .. "__" .. dsource
 377
 378                                 --assert(dtype ~= "ping", dsname .. " or " .. altname)
 379
 380                                 -- find datasource options
 381                                 local dopts = { }
 382
 383                                 if type(opts.data.options) == "table" then
 384                                         if type(opts.data.options[dsname]) == "table" then
 385                                                 dopts = opts.data.options[dsname]
 386                                         elseif type(opts.data.options[altname]) == "table" then
 387                                                 dopts = opts.data.options[altname]
 388                                         elseif type(opts.data.options[dname]) == "table" then
 389                                                 dopts = opts.data.options[dname]
 390                                         elseif type(opts.data.options[dtype]) == "table" then
 391                                                 dopts = opts.data.options[dtype]
 392                                         end
 393                                 end
 394
 395
 396                                 -- store values
 397                                 _ti( _sources, {
 398                                         rrd      = dopts.rrd     or self:mkrrdpath( plugin, plugin_instance, dtype, dinst ),
 399                                         color    = dopts.color   or self.colors:to_string( self.colors:random() ),
 400                                         flip     = dopts.flip    or false,
 401                                         total    = dopts.total   or false,
 402                                         overlay  = dopts.overlay or false,
 403                                         noarea   = dopts.noarea  or false,
 404                                         title    = dopts.title   or nil,
 405                                         ds       = dsource,
 406                                         type     = dtype,
 407                                         instance = dinst,
 408                                         index    = #_sources + 1,
 409                                         sname    = ( #_sources + 1 ) .. dtype
 410                                 } )
 411
 412
 413                                 -- generate datasource title
 414                                 _sources[#_sources].title = self.i18n:ds( _sources[#_sources] )
 415
 416
 417                                 -- find longest name ...
 418                                 if _sources[#_sources].title:len() > _longest_name then
 419                                         _longest_name = _sources[#_sources].title:len()
 420                                 end
 421
 422
 423                                 -- has totals?
 424                                 if _sources[#_sources].total then
 425                                         _has_totals = true
 426                                 end
 427                         end
 428                 end
 429         end
 430
 431
 432         --
 433         -- construct diagrams
 434         --
 435
 436         -- if per_instance is enabled then find all instances from the first datasource in diagram
 437         -- if per_instance is disabled then use an empty pseudo instance and use model provided values
 438         local instances = { "" }
 439
 440         if opts.per_instance then
 441                 instances = self.tree:data_instances( plugin, plugin_instance, _sources[1].type )
 442         end
 443
 444
 445         -- iterate over instances
 446         for i, instance in ipairs(instances) do
 447
 448                 -- store title and vlabel
 449                 _ti( _args, "-t" )
 450                 _ti( _args, self.i18n:title( plugin, plugin_instance, _sources[1].type, instance, opts.title ) )
 451                 _ti( _args, "-v" )
 452                 _ti( _args, self.i18n:label( plugin, plugin_instance, _sources[1].type, instance, opts.vlabel ) )
 453
 454                 -- store additional rrd options
 455                 if opts.rrdopts then
 456                         for i, o in ipairs(opts.rrdopts) do _ti( _args, o ) end
 457                 end
 458
 459
 460                 -- create DEF statements for each instance
 461                 for i, source in ipairs(_sources) do
 462                         -- fixup properties for per instance mode...
 463                         if opts.per_instance then
 464                                 source.instance = instance
 465                                 source.rrd      = self:mkrrdpath( plugin, plugin_instance, source.type, instance )
 466                         end
 467
 468                         __def( source )
 469                 end
 470
 471                 -- create CDEF required for calculating totals
 472                 __cdef_totals()
 473
 474                 -- create CDEF statements for each instance in reversed order
 475                 for i, source in ipairs(_sources) do
 476                         __cdef( _sources[1 + #_sources - i] )
 477                 end
 478
 479                 -- create LINE1, AREA and GPRINT statements for each instance
 480                 for i, source in ipairs(_sources) do
 481                         __line( source )
 482                         __gprint( source )
 483                 end
 484
 485                 -- prepend image path to arg stack
 486                 _ti( _args, 1, self:mkpngpath( plugin, plugin_instance, index .. instance ) )
 487
 488                 -- push arg stack to definition list
 489                 _ti( defs, _args )
 490
 491                 -- reset stacks
 492                 _args         = { }
 493                 _stack_pos    = { }
 494                 _stack_neg    = { }
 495         end
 496
 497         return defs
 498 end
 499
 500 function Graph.render( self, plugin, plugin_instance, is_index )
 501
 502         dtype_instances = dtype_instances or { "" }
 503         local pngs = { }
 504
 505         -- check for a whole graph handler
 506         local plugin_def = "luci.statistics.rrdtool.definitions." .. plugin
 507         local stat, def = pcall( require, plugin_def )
 508
 509         if stat and def and type(def.rrdargs) == "function" then
 510
 511                 -- temporary image matrix
 512                 local _images = { }
 513
 514                 -- get diagram definitions
 515                 for i, opts in ipairs( self:_forcelol( def.rrdargs( self, plugin, plugin_instance, nil, is_index ) ) ) do
 516                         if not is_index or not opts.detail then
 517                                 _images[i] = { }
 518
 519                                 -- get diagram definition instances
 520                                 local diagrams = self:_generic( opts, plugin, plugin_instance, nil, i )
 521
 522                                 -- render all diagrams
 523                                 for j, def in ipairs( diagrams ) do
 524                                         -- remember image
 525                                         _images[i][j] = def[1]
 526
 527                                         -- exec
 528                                         self:_rrdtool( def )
 529                                 end
 530                         end
 531                 end
 532
 533                 -- remember images - XXX: fixme (will cause probs with asymmetric data)
 534                 for y = 1, #_images[1] do
 535                         for x = 1, #_images do
 536                                 table.insert( pngs, _images[x][y] )
 537                         end
 538                 end
 539         end
 540
 541         return pngs
 542 end