#!/usr/bin/ruby

# loadcheck.rb
# This app pulls the system load via the 'uptime' command and checks the
# first value against the defined threshold. If the load is greater than the
# threshold, an email is dispatched with the current load values.

# Threshold value
TH = 3.0

# Regexp pattern for matching the load value for the last 15 minutes
pat = "(\\d+\\.\\d+), (\\d+\\.\\d+), (\\d+\\.\\d+)?"

# %x will execute the uptime command and return the output to uptime
uptime = %x[uptime]

# Declare a new regexp and attempt to match it against the output of uptime
re = Regexp.new(pat)
load1 = re.match(uptime)[1]
load5 = re.match(uptime)[2]
load15 = re.match(uptime)[3]

puts "Last minute: #{load1}"
puts "Last five minutes: #{load5}"
puts "Last fifteen minutes: #{load15}"

#if load1.to_f <= (TH - 0.01)
#       puts "Load below threshold!\n"
#else
#       puts "Load at or above threshold!\n"
#end