Class: DB::Postgres::Native::Connection

Inherits:
FFI::Pointer
  • Object
show all
Defined in:
lib/db/postgres/native/connection.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(address, io, types) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/db/postgres/native/connection.rb', line 140

def initialize(address, io, types)
	super(address)
	
	@io = io
	@types = types
end

Class Method Details

.connect(wrapper: IO, types: DEFAULT_TYPES, **options) ⇒ Object 



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# File 'lib/db/postgres/native/connection.rb', line 106

def self.connect(wrapper: IO, types: DEFAULT_TYPES, **options)
	# Prefer 'database' key for 'dbname' parameter:
	if database = options.delete(:database)
		options[:dbname] = database
	end
	
	keys = Native.array_of_strings(options.keys)
	values = Native.array_of_strings(options.values)
	
	pointer = Native.connect_start_params(keys, values, 0)
	Native.set_nonblocking(pointer, 1)
	
	io = wrapper.new(Native.socket(pointer), "r+")
	
	while status = Native.connect_poll(pointer)
		break if status == :ok || status == :failed
		
		# one of :wait_readable or :wait_writable
		io.send(status)
	end
	
	if status == :failed
		io.close
		
		error_message = Native.error_message(pointer)
		
		Native.finish(pointer)
		
		raise Error, "Could not connect: #{error_message}"
	end
	
	return self.new(pointer, io, types)
end

Instance Method Details

#close ⇒ Object

Close the connection.



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# File 'lib/db/postgres/native/connection.rb', line 163

def close
	Native.finish(self)
	
	@io.close
end

#discard_results ⇒ Object

Silently discard any results that application didn’t read.



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# File 'lib/db/postgres/native/connection.rb', line 220

def discard_results
	while result = self.get_result
		status = Native.result_status(result)
		Native.clear(result)
		
		case status
		when :copy_in
			self.put_copy_end("Discard results")
		when :copy_out
			self.flush_copy_out
		end
	end
	
	return nil
end

#error_message ⇒ Object

Return the last error message.



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# File 'lib/db/postgres/native/connection.rb', line 153

def error_message
	Native.error_message(self)
end

#escape_identifier(value) ⇒ Object 



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# File 'lib/db/postgres/native/connection.rb', line 181

def escape_identifier(value)
	value = value.to_s
	
	result = Native.escape_identifier(self, value, value.bytesize)
	
	string = result.read_string
	
	Native.free_memory(result)
	
	return string
end

#escape_literal(value) ⇒ Object 



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# File 'lib/db/postgres/native/connection.rb', line 169

def escape_literal(value)
	value = value.to_s
	
	result = Native.escape_literal(self, value, value.bytesize)
	
	string = result.read_string
	
	Native.free_memory(result)
	
	return string
end

#next_result(types: @types) ⇒ Object 



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# File 'lib/db/postgres/native/connection.rb', line 203

def next_result(types: @types)
	if result = self.get_result
		status = Native.result_status(result)
		
		if status == :fatal_error
			message = Native.result_error_message(result)
			
			Native.clear(result)
			
			raise Error, "Could not get next result: #{message}"
		end
		
		return Result.new(self, types, result)
	end
end

#send_query(statement) ⇒ Object 



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# File 'lib/db/postgres/native/connection.rb', line 197

def send_query(statement)
	check! Native.send_query(self, statement)
	
	flush
end

#single_row_mode! ⇒ Object 



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# File 'lib/db/postgres/native/connection.rb', line 193

def single_row_mode!
	Native.set_single_row_mode(self)
end

#socket ⇒ Object

Return the underlying socket used for IO.



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# File 'lib/db/postgres/native/connection.rb', line 158

def socket
	Native.socket(self)
end

#status ⇒ Object

Return the status of the connection.



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# File 'lib/db/postgres/native/connection.rb', line 148

def status
	Native.status(self)
end