Class: Bkblz::Task::DownloadFile

Inherits:
BaseTask
  • Object
show all
Defined in:
lib/bkblz/task/download_file.rb

Constant Summary

Constants included from ClassMethods

ClassMethods::PARAM_SPEC

Instance Attribute Summary

Attributes inherited from BaseTask

#config, #result

Instance Method Summary collapse

Methods inherited from BaseTask

#initialize, #run

Methods included from ClassMethods

#check_one_of, #check_params, #check_required, #run, #task_param, #task_params

Methods included from TaskHelpers

#find_bucket_by_name

Constructor Details

This class inherits a constructor from Bkblz::Task::BaseTask

Instance Method Details

#download_by_id(session, params) ⇒ Object 



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# File 'lib/bkblz/task/download_file.rb', line 65

def download_by_id(session, params)
  raise 'missing file id' unless params[:file_id]

  partial_file_info =
    Bkblz::V1::Model::PartialFileInfo.new :file_id => params[:file_id]
  session.send(
    Bkblz::V1::DownloadFileByIdRequest.new partial_file_info).to_model
end

#download_by_name(session, params) ⇒ Object 



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# File 'lib/bkblz/task/download_file.rb', line 55

def download_by_name(session, params)
  raise 'missing file name' unless params[:file_name]
  raise 'missing bucket name' unless params[:bucket_name]

  bucket = find_bucket_by_name session, params[:bucket_name]
  file = params[:file_name]
  session.send(
    Bkblz::V1::DownloadFileByNameRequest.new bucket, file).to_model
end

#run_internal(session, params) ⇒ Object 



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# File 'lib/bkblz/task/download_file.rb', line 18

def run_internal(session, params)
  download_file_info = if params[:use_filename]
                         download_by_name(session, params)
                       else
                         download_by_id(session, params)
                       end

  unless download_file_info.sha1 == Digest::SHA1.hexdigest(download_file_info.body)
    raise "invalid checksum"
  end

  dir_path = params[:dir_path]
  unless ::File.directory? dir_path
    raise "dir_path is not a directory: %s" % dir_path
  end
  unless ::File.writable?(dir_path)
    raise "unable to write to directory %s" % dir_path
  end

  out_file_name = download_file_info.file_name
  unless params[:strip_prefix].nil?
    out_file_name.gsub! params[:strip_prefix], ""
  end

  f_path = ::File.join dir_path, out_file_name
  if ::File.exists?(f_path) && !::File.writable?(f_path)
    raise "unable to write to existing file: %s" % f_path
  end

  ::File.binwrite(f_path, download_file_info.body)

  # This can be expensive, we're momentarily copying the body
  map = download_file_info.to_map
  map[:body] = "<omitted>"
  Bkblz::V1::Model::FileDownload.new map
end