Module: Taps::Utils

Extended by:
Utils
Included in:
Utils
Defined in:
lib/taps/utils.rb

Instance Method Summary collapse

Instance Method Details

#base64decode(data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 37

def base64decode(data)
  data.unpack("m").first
end

#base64encode(data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 33

def base64encode(data)
  [data].pack("m")
end

#bin(cmd) ⇒ Object 



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# File 'lib/taps/utils.rb', line 20

def bin(cmd)
  cmd = "#{cmd}.cmd" if windows?
  cmd
end

#blobs_to_string(row, columns) ⇒ Object 



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# File 'lib/taps/utils.rb', line 89

def blobs_to_string(row, columns)
  return row if columns.size == 0
  columns.each do |c|
    row[c] = row[c].to_s if row[c].kind_of?(Sequel::SQL::Blob)
  end
  row
end

#calculate_chunksize(old_chunksize) ⇒ Object 



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# File 'lib/taps/utils.rb', line 97

def calculate_chunksize(old_chunksize)
  c = Taps::Chunksize.new(old_chunksize)

  begin
    c.start_time = Time.now
    c.time_in_db = yield c
  rescue Errno::EPIPE, RestClient::RequestFailed, RestClient::RequestTimeout
    c.retries += 1
    raise if c.retries > 2

    # we got disconnected, the chunksize could be too large
    # reset the chunksize based on the number of retries
    c.reset_chunksize
    retry
  end

  c.end_time = Time.now
  c.calc_new_chunksize
end

#checksum(data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 25

def checksum(data)
  Zlib.crc32(data)
end

#format_data(data, opts = {}) ⇒ Object 



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# File 'lib/taps/utils.rb', line 41

def format_data(data, opts={})
  return {} if data.size == 0
  string_columns = opts[:string_columns] || []
  schema = opts[:schema] || []
  table  = opts[:table]

  max_lengths = schema.inject({}) do |hash, (column, meta)|
    if meta[:db_type] =~ /^varchar\((\d+)\)/
      hash.update(column => $1.to_i)
    end
    hash
  end

  header = data[0].keys
  only_data = data.collect do |row|
    row = blobs_to_string(row, string_columns)
    row.each do |column, data|
      if data.to_s.length > (max_lengths[column] || data.to_s.length)
        raise Taps::InvalidData.new(<<-ERROR)
Detected data that exceeds the length limitation of its column. This is
generally due to the fact that SQLite does not enforce length restrictions.

Table  : #{table}
Column : #{column}
Type   : #{schema.detect{|s| s.first == column}.last[:db_type]}
Data   : #{data}
        ERROR
      end
    end
    header.collect { |h| row[h] }
  end
  { :header => header, :data => only_data }
end

#incorrect_blobs(db, table) ⇒ Object

mysql text and blobs fields are handled the same way internally this is not true for other databases so we must check if the field is actually text and manually convert it back to a string



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# File 'lib/taps/utils.rb', line 78

def incorrect_blobs(db, table)
  return [] if (db.url =~ /mysql:\/\//).nil?

  columns = []
  db.schema(table).each do |data|
    column, cdata = data
    columns << column if cdata[:db_type] =~ /text/
  end
  columns
end

#load_indexes(database_url, index_data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 124

def load_indexes(database_url, index_data)
  Tempfile.open('taps') do |tmp|
    File.open(tmp.path, 'w') { |f| f.write(index_data) }
    schema_bin(:load_indexes, database_url, tmp.path)
  end
end

#load_schema(database_url, schema_data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 117

def load_schema(database_url, schema_data)
  Tempfile.open('taps') do |tmp|
    File.open(tmp.path, 'w') { |f| f.write(schema_data) }
    schema_bin(:load, database_url, tmp.path)
  end
end

#order_by(db, table) ⇒ Object 



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# File 'lib/taps/utils.rb', line 146

def order_by(db, table)
  pkey = primary_key(db, table)
  if pkey
    pkey.kind_of?(Array) ? pkey : [pkey.to_sym]
  else
    table = table.to_sym.identifier unless table.kind_of?(Sequel::SQL::Identifier)
    db[table].columns
  end
end

#primary_key(db, table) ⇒ Object 



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# File 'lib/taps/utils.rb', line 136

def primary_key(db, table)
  db.schema(table).select { |c| c[1][:primary_key] }.map { |c| c[0] }
end

#reraise_server_exception(e) ⇒ Object 



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# File 'lib/taps/utils.rb', line 171

def reraise_server_exception(e)
  if e.kind_of?(RestClient::Exception)
    if e.respond_to?(:response) && e.response.headers[:content_type] == 'application/json'
      json = OkJson.decode(e.response.to_s)
      klass = eval(json['error_class']) rescue nil
      raise klass.new(json['error_message'], :backtrace => json['error_backtrace']) if klass
    end
  end
  raise e
end

#schema_bin(*args) ⇒ Object 



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# File 'lib/taps/utils.rb', line 131

def schema_bin(*args)
  bin_path = File.expand_path("#{File.dirname(__FILE__)}/../../bin/#{bin('schema')}")
  `"#{bin_path}" #{args.map { |a| "'#{a}'" }.join(' ')}`
end

#server_error_handling(&blk) ⇒ Object

try to detect server side errors to give the client a more useful error message



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# File 'lib/taps/utils.rb', line 159

def server_error_handling(&blk)
  begin
    blk.call
  rescue Sequel::DatabaseError => e
    if e.message =~ /duplicate key value/i
      raise Taps::DuplicatePrimaryKeyError, e.message
    else
      raise
    end
  end
end

#single_integer_primary_key(db, table) ⇒ Object 



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# File 'lib/taps/utils.rb', line 140

def single_integer_primary_key(db, table)
  table = table.to_sym.identifier unless table.kind_of?(Sequel::SQL::Identifier)
  keys = db.schema(table).select { |c| c[1][:primary_key] and c[1][:type] == :integer }
  not keys.nil? and keys.size == 1
end

#valid_data?(data, crc32) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/taps/utils.rb', line 29

def valid_data?(data, crc32)
  Zlib.crc32(data) == crc32.to_i
end

#windows? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/taps/utils.rb', line 14

def windows?
  return @windows if defined?(@windows)
  require 'rbconfig'
  @windows = !!(::Config::CONFIG['host_os'] =~ /mswin|mingw/)
end