Sample Lua code for graphing statsd data

statsd_graph

require("circular_buffer")
require("string")
require("cjson")

local idx_num
local stat_value
local debug

-- # rows, # cols, # seconds per row
cbuf = circular_buffer.new(300, 1, 1)
cbuf_idx = cbuf:set_header(1, "counter.0.count")
stat_name = "Fields[stats.counters.000000.count]"

function process_message()
    local ts = read_message("Fields[timestamp]") * 1e9
    stat_value = read_message(stat_name)
    if stat_value then
        cbuf:add(ts, cbuf_idx, stat_value)
    end
    return 0
end

function timer_event(ns)
    inject_payload("cbuf", "Counter Stats", cbuf)
end