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August 29, 2015 14:21
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A simple Ruby command line tool which takes a Heroku log tail as STDIN and tries to detect an increase in swap space on a particular dyno
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| #!/usr/bin/env ruby | |
| require 'time' | |
| LINE_REGEXP = /(\d{4})-(\d{2})-(\d{2})T(\d{2})\:(\d{2})\:(\d{2})\.(\d{6})\+(\d{2})\:(\d{2})\s(.+?)\[(.+?)\.(.+?)\]\:(.+)/ | |
| MAX_MEMORY = ARGV[0].to_f | |
| APP = ARGV[1].to_s | |
| printf "Max Memory is #{MAX_MEMORY}\n" | |
| printf "App is #{APP}\n" | |
| while true do | |
| f = open("|heroku logs --app #{APP}") | |
| lines = f.read() | |
| f.close | |
| lines.each_line do |e| | |
| # TODO: use named groups here so that references to matches aren't as fragile | |
| matches = LINE_REGEXP.match(e) | |
| if matches | |
| timestamp = "#{matches[1]}-#{matches[2]}-#{matches[3]} #{matches[4]}:#{matches[5]}:#{matches[6]}" | |
| if (matches[13].include?("R14")) | |
| command = "heroku ps:restart #{matches[11]}.#{matches[12]} --app #{APP}" | |
| system("#{command}") | |
| end | |
| end | |
| end | |
| sleep(5) | |
| end |
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