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 33

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

#base64encode(data) ⇒ Object 



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

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

#bin(cmd) ⇒ Object 



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# File 'lib/taps/utils.rb', line 16

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 63

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 71

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 21

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

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



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

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

	header = data[0].keys
	only_data = data.collect do |row|
		row = blobs_to_string(row, string_columns)
		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 52

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 117

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 110

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 144

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 129

def primary_key(db, table)
	table = table.to_sym.identifier unless table.kind_of?(Sequel::SQL::Identifier)
	if db.respond_to?(:primary_key)
		db.primary_key(table)
	else
		db.schema(table).select { |c| c[1][:primary_key] }.map { |c| c.first.to_sym }
	end
end

#schema_bin(*args) ⇒ Object 



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

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

#single_integer_primary_key(db, table) ⇒ Object 



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# File 'lib/taps/utils.rb', line 138

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 25

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 10

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