Module: Tapsoob::Utils

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

Instance Method Summary collapse

Instance Method Details

#base64decode(data) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 36

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

#base64encode(data) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 32

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

#bin(cmd) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 19

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

#calculate_chunksize(old_chunksize) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 119

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

  begin
    c.start_time = Time.now
    c.time_in_db = yield c
  rescue Errno::EPIPE
    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/tapsoob/utils.rb', line 24

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

#encode_blobs(row, columns) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 111

def encode_blobs(row, columns)
  return row if columns.size == 0
  columns.each do |c|
    row[c] = base64encode(row[c]) unless row[c].nil?
  end
  row
end

#export_indexes(dump_path, table, index_data) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 145

def export_indexes(dump_path, table, index_data)
  # Use append-only writes to avoid O(n²) complexity
  index_file = File.join(dump_path, "indexes", "#{table}.json")

  File.open(index_file, 'a') do |file|
    file.write(JSON.generate(index_data) + "\n")
  end
end

#export_rows(dump_path, table, row_data) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 154

def export_rows(dump_path, table, row_data)
  # Use append-only writes to avoid O(n²) complexity
  # Store metadata separately and append data chunks as NDJSON
  data_file = File.join(dump_path, "data", "#{table}.json")

  File.open(data_file, 'a') do |file|
    file.write(JSON.generate(row_data) + "\n")
  end
end

#export_schema(dump_path, table, schema_data) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 139

def export_schema(dump_path, table, schema_data)
  File.open(File.join(dump_path, "schemas", "#{table}.rb"), 'w') do |file|
    file.write(schema_data)
  end
end

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



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# File 'lib/tapsoob/utils.rb', line 40

def format_data(db, 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 = encode_blobs(row, string_columns)
    row.each do |column, data|
      if data.to_s.length > (max_lengths[column] || data.to_s.length)
        raise Tapsoob::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

      # Type conversion
      row[column] = data.strftime('%Y-%m-%d %H:%M:%S') if data.is_a?(Time)
    end
    header.collect { |h| row[h] }
  end

  res = { table_name: table, header: header, data: only_data }

  # Add types if schema isn't empty
  db.extension :schema_dumper # Add schema dumper extension in case it hasn't been added until now
  res[:types] = schema.map do |c|
    case db.column_schema_to_ruby_type(c.last)[:type].to_s
    when "BigDecimal"
      "float"
    when "Bignum"
      "integer"
    when "File"
      "blob"
    when "TrueClass"
      "boolean"
    else
      db.column_schema_to_ruby_type(c.last)[:type].to_s.downcase
    end
  end unless schema.empty?

  res
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/tapsoob/utils.rb', line 100

def incorrect_blobs(db, table)
  return [] if (db.url =~ /(mysql|mysql2):\/\//).nil?

  columns = []
  db.schema(table).each do |data|
    column, cdata = data
    columns << column if cdata[:type] == :blob
  end
  columns
end

#load_indexes(database_url, index) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 169

def load_indexes(database_url, index)
  Tapsoob::Schema.load_indexes(database_url, index)
end

#load_schema(dump_path, database_url, table) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 164

def load_schema(dump_path, database_url, table)
  schema = File.join(dump_path, "schemas", "#{table}.rb")
  schema_bin(:load, database_url, schema.to_s)
end

#order_by(db, table) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 190

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 unless table.kind_of?(Sequel::SQL::Identifier)
    db[table].columns
  end
end

#primary_key(db, table) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 180

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

#schema_bin(command, *args) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 173

def schema_bin(command, *args)
  require 'tapsoob/cli'
  subcommand = "schema"
  script = Tapsoob::CLI::Schema.new
  script.invoke(command, args.map { |a| "#{a}" })
end

#single_integer_primary_key(db, table) ⇒ Object 



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# File 'lib/tapsoob/utils.rb', line 184

def single_integer_primary_key(db, table)
  table = table.to_sym 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/tapsoob/utils.rb', line 28

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

#windows? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tapsoob/utils.rb', line 13

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