Class: Salesforce::FileWriter

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FileWriter

Returns a new instance of FileWriter.



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# File 'lib/salesforce/file_writer.rb', line 5

def initialize
  super
  #### define @logger
  # http://ruby-doc.org/core/classes/@logger.html
  # TODO use a log file, rather than Standout
  @logger = Logger.new(STDOUT)
  @logger.debug 'FileWriter initialized.'
end

Instance Method Details

#do_write_file(filename, filesize, filedata, parent_dir) ⇒ Object

This method optimizes the file writing process. If the local file already exists and matchs the remote filesize, it skips writing. Otherwise, it writes the file. returns local_file_name = RAILS_ROOT/public/tmp/<parent_dir>/filename

‘filename’ the remote filename ‘filesize’ the size of the remote file ‘filedata’ contains encoded file data ‘parent_dir’ the subdirectory where the file will be stored at



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# File 'lib/salesforce/file_writer.rb', line 22

def do_write_file(filename, filesize, filedata, parent_dir)
  # Downloaded files are put in the subdirectory matching each session-id in the /public/tmp directory.
  # creates dir, if it does not exists
  dir = "/tmp/#{parent_dir}"
  # Creating the 'tmp' under the 'public' to hold downloaded files.
  Dir.mkdir(RAILS_ROOT + "/public/tmp" ) unless File.directory?(RAILS_ROOT + "/public/tmp")
  # Putting files in each user's sesseion directory.
  Dir.mkdir(RAILS_ROOT + "/public" + dir ) unless File.directory?(RAILS_ROOT + "/public" + dir)
  local_file_name =  dir + "/#{filename}"

  writefile_flag = true
  #local_file_name =  '/tmp/' + session_id + "-" + filename

  if !File.exist?(RAILS_ROOT + "/public" + local_file_name)
    # local file does not exist, write the local file
    @logger.info("local file does not exist, write the local file.")
    writefile_flag = true
  elsif File.size(RAILS_ROOT + "/public" + local_file_name).to_i == filesize.to_i
    # local file exists & file size matchs remote file sizem, skip writing the local local file
    @logger.info("local file exists & file size matchs remote file sizem, skip writing the local local file.")
    writefile_flag = false
  else
    @logger.info("Write the local file: " + RAILS_ROOT + "/public" + local_file_name)
    writefile_flag = true
  end

  if writefile_flag
    #Now, construct the file, 1st decode, 2nd, write it out
    attachment = File.new(RAILS_ROOT + "/public" + local_file_name, 'w+b')
    # Salesforce sends back an encoded data. It needs to be decoded into binary.
    # otherwise, it starts off with "/9j/4AAQSkZJRgABA......."
    decoded_data = Base64.decode64(filedata)
    attachment.write(decoded_data)     #=> 10
  end
  
  return local_file_name
end