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79 lines
1.5 KiB
Ruby
79 lines
1.5 KiB
Ruby
class AsciicastSnapshotter
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attr_reader :id, :asciicast
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def initialize(id)
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@id = id
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end
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def run
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@asciicast = Asciicast.find(id)
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delay = (asciicast.duration / 2).to_i
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delay = 30 if delay > 30
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asciicast.snapshot = create_snapshot(delay)
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asciicast.save!
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rescue ActiveRecord::RecordNotFound
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# oh well...
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end
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private
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def create_snapshot(delay)
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data = get_data_to_feed(delay)
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screen = TSM::Screen.new(asciicast.terminal_columns,
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asciicast.terminal_lines)
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vte = TSM::Vte.new(screen)
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vte.input(data)
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screen.snapshot.to_s
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end
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def get_data_to_feed(delay)
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timing = get_timing
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stdout = get_stdout
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i = 0
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time = 0
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bytes_to_feed = 0
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while time < delay
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time += timing[i][0]
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bytes_to_feed += timing[i][1]
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i += 1
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end
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stdout.bytes.take(bytes_to_feed)
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end
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def get_timing
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file = asciicast.stdout_timing
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file.cache_stored_file! unless file.cached?
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lines = unbzip(file.file.path).lines
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timing = lines.map do |line|
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delay, n = line.split
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delay = delay.to_f
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n = n.to_i
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[delay, n]
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end
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end
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def get_stdout
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file = asciicast.stdout
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file.cache_stored_file! unless file.cached?
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unbzip(file.file.path)
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end
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def unbzip(path)
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f = IO.popen "bzip2 -d -c #{path}", "r"
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data = f.read
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f.close
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data
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end
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def log(text, level = :info)
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Rails.logger.send(level, "SnapshotWorker: #{text}")
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end
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end
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