Class: Dap::Input::InputWARC

Inherits:
Object
  • Object
show all
Includes:
FileSource
Defined in:
lib/dap/input/warc.rb

Overview

WARC

Instance Attribute Summary collapse

Attributes included from FileSource

#fd

Instance Method Summary collapse

Methods included from FileSource

#close, #open

Constructor Details

#initialize(args) ⇒ InputWARC

Returns a new instance of InputWARC.



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# File 'lib/dap/input/warc.rb', line 13

def initialize(args)
  self.open(args.first)
  read_warc_header
end

Instance Attribute Details

#header ⇒ Object

Returns the value of attribute header.



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# File 'lib/dap/input/warc.rb', line 11

def header
  @header
end

#info ⇒ Object

Returns the value of attribute info.



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# File 'lib/dap/input/warc.rb', line 11

def info
  @info
end

Instance Method Details

#read_record ⇒ Object 



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# File 'lib/dap/input/warc.rb', line 37

def read_record
  begin

    version = self.fd.readline
    unless version and version =~ /^WARC\/\d+\.\d+/
      return Error::EOF
    end
    warc = {}
  
    loop do
      line = self.fd.readline
      
      unless line.strip.length == 0
        k, v = line.strip.split(/\s*:\s*/, 2)
        k    = k.downcase.gsub('-', '_')
        warc[k] = v.to_s
        next
      end

      unless warc['content_length']
        return Error::EOF
      end

      warc['content'] = self.fd.read(warc['content_length'].to_i)
      skip = self.fd.readline
      skip = self.fd.readline

      unless skip.strip.length == 0
        return Error::EOF
      end

      break
    end

    return warc

  rescue ::EOFError
    return Error::EOF
  end
end

#read_warc_header ⇒ Object 



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# File 'lib/dap/input/warc.rb', line 18

def read_warc_header
  self.header = read_record
  
  if self.header == Error::EOF
    raise RuntimeError, "Invalid WARC header"
  end

  unless self.header['warc_type'].to_s == "warcinfo"
    raise RuntimeError, "Invalid WARC header (missing warcinfo)"
  end

  self.info = {}
  self.header['content'].to_s.split("\n").each do |line|
    k, v = line.strip.split(/\s*:\s*/, 2)
    next unless v
    self.info[k] = v
  end
end