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 35

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

#base64encode(data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 31

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

#bin(cmd) ⇒ Object 



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# File 'lib/taps/utils.rb', line 18

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 87

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 95

def calculate_chunksize(old_chunksize)
  chunksize = old_chunksize

  retries = 0
  time_in_db = 0
  begin
    t1 = Time.now
    time_in_db = yield chunksize
    time_in_db = time_in_db.to_f rescue 0
  rescue Errno::EPIPE, RestClient::RequestFailed, RestClient::RequestTimeout
    retries += 1
    raise if retries > 2

    # we got disconnected, the chunksize could be too large
    # on first retry change to 10, on successive retries go down to 1
    chunksize = (retries == 1) ? 10 : 1

    retry
  end

  t2 = Time.now

  diff = t2 - t1 - time_in_db

  new_chunksize = if retries > 0
    chunksize
  elsif diff > 3.0
    (chunksize / 3).ceil
  elsif diff > 1.1
    chunksize - 100
  elsif diff < 0.8
    chunksize * 2
  else
    chunksize + 100
  end
  new_chunksize = 1 if new_chunksize < 1
  new_chunksize
end

#checksum(data) ⇒ Object 



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# File 'lib/taps/utils.rb', line 23

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

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



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# File 'lib/taps/utils.rb', line 39

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] =~ /^\w+\((\d+)\)/
      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 76

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 141

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 134

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 163

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 153

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 188

def reraise_server_exception(e)
  if e.kind_of?(RestClient::Exception)
    if e.respond_to?(:response) && e.response.headers[:content_type] == 'application/json'
      json = JSON.parse(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 148

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 176

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 157

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 27

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 12

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