chartist to display nice pie...

[admin]

Custom JS to fetch trend data from trends.lp:

Code:

function getdate(offset) {
  var date = new Date();
 
  date.setDate(date.getDate() + offset);
 
  var year = date.getFullYear();
  var month = date.getMonth() + 1;
  var day = date.getDate();
 
  return { year, month, day };
}

function getdata() {
  var trends = [
    1,
    'Temperature',
    'Humidity',
   ];

  var data = JSON.stringify({
    trends: trends,
    dates: {
      start: getdate(0),
      end: getdate(1),
    },
    // resolution: 86400,
    // timestamps: true,
  });
 
  $.post('/user/trends.lp', data, function(resp) {
    console.log(resp);
  });
}

Both trend ID and name can be specified. Set resolution to 86400 to fetch daily data. Set timestamps to true to fetch both data and timestamps.


trends.lp

Code:

<?

require('json')
require('trends')

trends.NaN = json.null

ngx.header.content_type = 'application/json'

local req = ngx.req.get_body_data()
req = json.pdecode(req)

local res = {}
local dates = req.dates
local resolution = tonumber(req.resolution)
local timestamps = toboolean(req.timestamps)

for i, idname in ipairs(req.trends) do
  local id = tonumber(idname)

  if id then
    res[ i ] = trends.fetchrangebyid(id, dates, resolution, timestamps)
  else
    res[ i ] = trends.fetch(idname, dates, resolution, timestamps)
  end
end

json.write(res)

Note that there is no input data validation so the script can end with 500 Internal Server Error if the input data is incorrect.