Class: Logpos

Inherits:
Object
  • Object
show all
Defined in:
lib/logpos.rb

Defined Under Namespace

Classes: TripleArray

Constant Summary collapse

VERSION = 
'1.0.2'
TIME_PARSER_CLASS = 
if defined? Chronic
  Chronic
else
  require 'active_support'
  Time
end

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Logpos

Returns a new instance of Logpos.



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# File 'lib/logpos.rb', line 14

def initialize
  @time_parser = proc {|line| line.match(/^Started/) && TIME_PARSER_CLASS.parse(line.split(/for [0-9\.]* at /)[-1]) }
end

Instance Attribute Details

#time_parser ⇒ Object

Returns the value of attribute time_parser.



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# File 'lib/logpos.rb', line 13

def time_parser
  @time_parser
end

Class Method Details

.seek_pos_before(file_path, lastest_visited_at) ⇒ Object 



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# File 'lib/logpos.rb', line 18

def self.seek_pos_before file_path, lastest_visited_at
  Logpos.new.seek_pos_before file_path, lastest_visited_at
end

Instance Method Details

#seek_pos_before(file_path, lastest_visited_at) ⇒ Object 



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# File 'lib/logpos.rb', line 22

def seek_pos_before file_path, lastest_visited_at
  ta = TripleArray.new lastest_visited_at

  @file ||= File.open(file_path)
  @file.reopen(file_path)
  pos_start, pos_end = 0, File.size(@file)
  pos_mid = pos_end / 2
  time = Time.at(0)
  between = -1.0/0

  loop do
    pos_mid, time = seek_log_pos(@file, pos_mid)
    break if time.nil? || (pos_mid == pos_end)

    time_valid = lastest_visited_at >= time
    break if time_valid && ((lastest_visited_at - time) >= between.abs)
    between = lastest_visited_at - time
    break if time_valid && ta.push(pos_mid, time).nil?

    if between > 0
      pos_start = pos_mid
      pos_mid = (pos_mid + pos_end) / 2
    elsif between < 0
      pos_end = pos_mid
      pos_mid = (pos_mid + pos_start) / 2
    end
  end
  @file.close

  return ta.oldest.pos
end