mongo-ruby-driver/tests/test_grid_store.rb

$LOAD_PATH[0,0] = File.join(File.dirname(__FILE__), '..', 'lib')
require 'test/unit'
require 'rubygems'
require 'mongo'
require 'mongo/gridfs'

class GridStoreTest < Test::Unit::TestCase

  include XGen::Mongo::Driver
  include XGen::Mongo::GridFS

  def setup
    @host = ENV['MONGO_RUBY_DRIVER_HOST'] || 'localhost'
    @port = ENV['MONGO_RUBY_DRIVER_PORT'] || Mongo::DEFAULT_PORT
    @db = Mongo.new(@host, @port).db('ruby-mongo-utils-test')

    @files = @db.collection('_files')
    @chunks = @db.collection('_chunks')
    @chunks.clear
    @files.clear

    GridStore.open(@db, 'foobar', 'w') { |f| f.write("hello, world!") }
  end

  def teardown
    if @db && @db.connected?
      @chunks.clear
      @files.clear
      @db.close
    end
  end

  def test_small_write
    rows = @files.find({'filename' => 'foobar'}).to_a
    assert_not_nil rows
    assert_equal 1, rows.length
    assert_equal 1, rows.length
    row = rows[0]
    assert_not_nil row

    assert_kind_of DBRef, row['next']
    first_chunk_id = row['next'].object_id
    first_chunk = @chunks.find({'_id' => first_chunk_id}).next_object
  end

  def test_small_file
    rows = @files.find({'filename' => 'foobar'}).to_a
    assert_not_nil rows
    assert_equal 1, rows.length
    row = rows[0]
    assert_not_nil row
    assert_equal "hello, world!", GridStore.read(@db, 'foobar')
  end

  def test_overwrite
    GridStore.open(@db, 'foobar', 'w') { |f| f.write("overwrite") }
    assert_equal "overwrite", GridStore.read(@db, 'foobar')
  end

  def test_read_length
    assert_equal "hello", GridStore.read(@db, 'foobar', 5)
  end

# TODO seek not yet implemented
#   def test_read_with_offset
#     assert_equal "world", GridStore.read(@db, 'foobar', 5, 7)
#     assert_equal "world!", GridStore.read(@db, 'foobar', nil, 7)
#   end

  def test_multi_chunk
    @chunks.clear
    @files.clear

    size = 512
    GridStore.open(@db, 'biggie', 'w') { |f|
      f.chunk_size = size
      f.write('x' * size)
      f.write('y' * size)
      f.write('z' * size)
    }

    assert_equal 3, @chunks.count
    assert_equal ('x' * size) + ('y' * size) + ('z' * size), GridStore.read(@db, 'biggie')
  end

  def test_puts_and_readlines
    GridStore.open(@db, 'multiline', 'w') { |f|
      f.puts "line one"
      f.puts "line two\n"
      f.puts "line three"
    }

    lines = GridStore.readlines(@db, 'multiline')
    assert_equal ["line one\n", "line two\n", "line three\n"], lines
  end

  def test_unlink
    assert_equal 1, @files.count
    assert_equal 1, @chunks.count
    GridStore.unlink(@db, 'foobar')
    assert_equal 0, @files.count
    assert_equal 0, @chunks.count
  end

  def test_append
    GridStore.open(@db, 'foobar', 'w+') { |f| f.write(" how are you?") }
    assert_equal 1, @chunks.count
    assert_equal "hello, world! how are you?", GridStore.read(@db, 'foobar')
  end

  def test_rewind_and_truncate_on_write
    GridStore.open(@db, 'foobar', 'w') { |f|
      f.write("some text is inserted here")
      f.rewind
      f.write("abc")
    }
    assert_equal "abc", GridStore.read(@db, 'foobar')
  end

  def test_tell
    GridStore.open(@db, 'foobar', 'r') { |f|
      f.read(5)
      assert_equal 5, f.tell
    }
  end

  def test_empty_block_ok
    GridStore.open(@db, 'empty', 'w')
  end

  def test_save_empty_file
    @chunks.clear
    @files.clear
    GridStore.open(@db, 'empty', 'w')
    assert_equal 1, @files.count
    assert_equal 0, @chunks.count
  end

  def test_empty_file_eof
    GridStore.open(@db, 'empty', 'w')
    GridStore.open(@db, 'empty', 'r') { |f|
      assert f.eof?
    }
  end

  def test_cannot_change_chunk_size_on_read
    begin
      GridStore.open(@db, 'foobar', 'r') { |f| f.chunk_size = 42 }
      fail "should have seen error"
    rescue => ex
      assert_match /error: can only change chunk size/, ex.to_s
    end
  end

  def test_cannot_change_chunk_size_after_data_written
    begin
      GridStore.open(@db, 'foobar', 'w') { |f|
        f.write("some text")
        f.chunk_size = 42
      }
      fail "should have seen error"
    rescue => ex
      assert_match /error: can only change chunk size/, ex.to_s
    end
  end

  def test_change_chunk_size
    GridStore.open(@db, 'new-file', 'w') { |f|
      f.chunk_size = 42
      f.write("foo")
    }
    GridStore.open(@db, 'new-file', 'r') { |f|
      assert f.chunk_size == 42
    }
  end

end