Class: GRI::Graph

Inherits:
Object show all
Includes:
Utils
Defined in:
lib/gri/graph.rb

Constant Summary collapse

SIZE = 
{'ss'=>[145, 80], 's'=>[400, 80], 'l'=>[640, 300],
'll'=>[860, 500], 'xl'=>[1200,700], 'gf'=>[387, 110]}
SCOLORS = 
['3366ff', 'ff6666', '00cc00', 'ffccff', 'ff0000', 'ffff00',
'00ff00', '009900', '33ccff', '990000', 'cc99ff', '330099', 'ff33ff',
'33ffff', 'ffcc33', '33cc99', 'cccccc', '9999ff', '000000', 'eeee66',
'3f3fff', '3faf3f', 'ff3f3f', 'ffaf3f', '990033', '003399', '3fff3f',
'ffff3f', '3f667f', '00cc00', 'ff9966', '3366cc', '666666', '99ff99']

Instance Method Summary collapse

Methods included from Utils

get_prop, key_encode, load_records, parse_host_key, parse_key, search_records, update_ltsv_file, url_encode

Constructor Details

#initialize(options = {}) ⇒ Graph

Returns a new instance of Graph.



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# File 'lib/gri/graph.rb', line 20

def initialize options={}
  @options = options
  @hprops = {}
  @hosthash = {}
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/gri/graph.rb', line 166

def call env
  req = GRI::Request.new env
  params = req.gparams
  ENV['TZ'] = Config['tz'] if Config['tz']
  ENV['TZ'] = params['tz'].to_s unless params['tz'].blank?
  stime, etime = req.params['stime'].to_i, req.params['etime'].to_i
  etime = (Time.now + etime).to_i if etime <= 0
  stime = (etime + stime).to_i if stime <= 0

  if req.params['fmt'] == 'json'
    str = xport stime, etime, params
    [200, {'Content-type'=>'text/plain'}, [str]]
  else
    img = graph stime, etime, params
    [200, {'Content-type'=>'image/png'}, [img]]
  end
rescue
  Log.error "#{$!}: #{$@.first}"
  [500, {}, []]
end

#get_rrdpaths_and_ub(rnames) ⇒ Object 



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# File 'lib/gri/graph.rb', line 26

def get_rrdpaths_and_ub rnames
  total_ub = 0
  rrdpaths = []
  dirs = @options[:dirs]
  for rname in rnames
    host, key = rname.split('_', 2)
    @hosthash[host] = true
    dir, h = search_records dirs, host
    if h
      @hprops[host] ||= h
      if h[key]
        prop = get_prop h[key]
        total_ub += prop[:ub].to_i
      end
      path = "#{dir}/#{host}/#{Rack::Utils.escape rname}.rrd"
      rrdpaths.push path if File.exist? path
    end
  end
  return rrdpaths, total_ub
end

#graph(stime, etime, params) ⇒ Object 



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# File 'lib/gri/graph.rb', line 209

def graph stime, etime, params
  rnames = params.getvar 'r'
  r = rnames.first
  host, data_name, index = parse_host_key r
  rrdpaths, total_ub = get_rrdpaths_and_ub rnames

  args = []
  if total_ub > 0 and (params['p'] != 'v')
    args.push "-u #{total_ub} --alt-autoscale-max" if params['y'] == 'u'
    args.push "HRULE:#{total_ub}#ff0000"
  end
  if params['title']
    args.push "--title \"#{params['title']}\""
  elsif (title = mk_graph_title rnames, params)
    args.push "--title #{title}"
  end

  specs = DEFS.get_specs data_name
  args += mk_graph_args specs, rrdpaths, params

  rrd = RRD.new Config['rrdcached-address']
  # size
  rrd.width, rrd.height = SIZE[params['z']]
  # font
  if Config['font']
    Config.getvar('font').each {|fstr| rrd.fonts.push fstr}
  end

  img = rrd.graphgen stime, etime, args
end

#mk_comp_defs(rrdpaths, comp_t, gattr, &block) ⇒ Object 



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# File 'lib/gri/graph.rb', line 126

def mk_comp_defs rrdpaths, comp_t, gattr, &block
  case comp_t
  when 's'; mk_stack_defs rrdpaths, gattr, &block
  when 'v'; mk_ov_defs rrdpaths, gattr, &block
  else mk_sum_defs rrdpaths, gattr, &block
  end
end

#mk_defstr(ds_specs, rrdpaths, params, limit) ⇒ Object 



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# File 'lib/gri/graph.rb', line 98

def mk_defstr ds_specs, rrdpaths, params, limit
  mdefs = []
  ds_param = params['ds'].blank? ? nil : params['ds']
  if limit and limit.size == 2
    lower, upper = limit
  end
  x_p = (params['fmt'] == 'json')
  for ds_spec in ds_specs
    mname, dsname, dst, cf, gline, gcolor, legend, mag = ds_spec.split(',')
    next if gline == '-' or (ds_param and ds_param != dsname)
    cf = 'MAX' if cf.blank?
    gline = 'LINE1' if gline.blank?
    gcolor = '#0000ff' if gcolor.blank?
    legend = dsname if legend.blank?
    mag ||= 1
    gattr = [gline, gcolor, legend, params['cl'], params['hw']]
    sdefs = mk_comp_defs(rrdpaths, params['p'], gattr) {
      |paths, xcf, ind, gattr|
      xgline, xgcolor, xlegend = gattr
      xgline = 'XPORT' if x_p
      RRD.defstr paths, dsname, cf, "#{dsname}#{ind}",
        xgline, xgcolor, xlegend, mag, lower, upper
    }
    mdefs.push sdefs
  end
  mdefs
end

#mk_graph_args(specs, rrdpaths, params) ⇒ Object 



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# File 'lib/gri/graph.rb', line 79

def mk_graph_args specs, rrdpaths, params
  defs = []

  gidx = params['g'].to_i
  gr_spec = (specs[:graph] || [])[gidx]
  vlabel, base, limit, pickup_re, opts = gr_spec
  defs.push %Q{-v "#{vlabel.gsub(/\"/, '')}"} if vlabel
  if Numeric === base
    defs.push(base.zero? ? '--units-exponent 0 --alt-y-grid' :
               "--base #{base}")
  end
  defs.push "--lower-limit 0"

  ds_specs = specs[:ds] || []
  ds_specs = ds_specs.grep pickup_re if pickup_re
  defs += mk_defstr ds_specs, rrdpaths, params, limit
  defs.flatten
end

#mk_graph_title(rs, params) ⇒ Object 



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# File 'lib/gri/graph.rb', line 47

def mk_graph_title rs, params
  if params['p'] == 't'
    r, = rs
    host, key = r.split('_', 2)
    dir, h = search_records @options[:dirs], host
    if h
      @hprops[host] ||= h
      if h[key]
        prop = get_prop h[key]
        t = %Q{"#{host} #{prop[:name]} #{prop[:description]}"}
      end
    end
  elsif (params['p'] == 's' or params['p'] == 'v') and
      (params['ds'] and params['ds'] != '')
    t = params['ds']
  end
  t
end

#mk_label(path) ⇒ Object 



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# File 'lib/gri/graph.rb', line 66

def mk_label path
  dir = File.dirname path
  label = File.basename path, '.rrd'
  host, key = label.split('_', 2)
  h = (@hprops[host] ||= (load_records "#{dir}/#{host}"))
  if h and h[key]
    prop = get_prop h[key]
    name = prop[:legend] || prop[:name] || key
    label = (@hosthash.size > 1) ? "#{host} #{name}" : name
  end
  label
end

#mk_ov_defs(rrdpaths, gattr, &block) ⇒ Object 



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# File 'lib/gri/graph.rb', line 155

def mk_ov_defs rrdpaths, gattr, &block
  defs = []
  rrdpaths.each_with_index {|path, ind|
    gcolor = '#' + SCOLORS[ind % SCOLORS.size]
    legend = mk_label path
    gattr = ['LINE1', gcolor, legend]
    defs += [block.call([path], 'MAX', ind, gattr)]
  }
  defs
end

#mk_stack_defs(rrdpaths, gattr, &block) ⇒ Object 



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# File 'lib/gri/graph.rb', line 142

def mk_stack_defs rrdpaths, gattr, &block
  defs = []
  gline = 'AREA'
  rrdpaths.each_with_index {|path, ind|
    gcolor = '#' + SCOLORS[ind % SCOLORS.size]
    legend = mk_label path
    gattr = [gline, gcolor, legend]
    defs += [block.call([path], 'MAX', ind, gattr)]
    gline = 'STACK'
  }
  defs
end

#mk_sum_defs(rrdpaths, gattr, &block) ⇒ Object 



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# File 'lib/gri/graph.rb', line 134

def mk_sum_defs rrdpaths, gattr, &block
  if (legend = gattr[2]) == ':index'
    path, = rrdpaths
    host, dn, gattr[2] = File.basename(path, '.rrd').split('_', 3)
  end
  block.call(rrdpaths, 'MAX', 0, gattr)
end

#xport(stime, etime, params) ⇒ Object 



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# File 'lib/gri/graph.rb', line 187

def xport stime, etime, params
  rnames = params.getvar 'r'
  r = rnames.first
  host, data_name, index = parse_host_key r
  rrdpaths, total_ub = get_rrdpaths_and_ub rnames

  specs = DEFS.get_specs data_name
  gidx = params['g'].to_i
  gr_spec = (specs[:graph] || [])[gidx]
  vlabel, base, limit, pickup_re, opts = gr_spec

  ds_specs = specs[:ds] || []
  ds_specs = ds_specs.grep pickup_re if pickup_re
  args = []
  if params['maxrows'].present?
    args.push "--maxrows #{params['maxrows'].to_i}"
  end
  args += mk_defstr(ds_specs, rrdpaths, params, limit).flatten
  rrd = RRD.new Config['rrdcached-address']
  str = rrd.xport stime, etime, *args
end