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# encoding: ascii-8bit
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
module Thrift
class FramedTransport < BaseTransport
def initialize(transport, read=true, write=true)
@transport = transport
@rbuf = ''
@wbuf = ''
@read = read
@write = write
@index = 0
end
def open?
@transport.open?
end
def open
@transport.open
end
def close
@transport.close
end
def read(sz)
return @transport.read(sz) unless @read
return '' if sz <= 0
read_frame if @index >= @rbuf.length
@index += sz
@rbuf.slice(@index - sz, sz) || ''
end
def read_byte
return @transport.read_byte() unless @read
read_frame if @index >= @rbuf.length
# The read buffer has some data now, read a single byte. Using get_string_byte() avoids
# allocating a temp string of size 1 unnecessarily.
@index += 1
return ::Thrift::TransportUtils.get_string_byte(@rbuf, @index - 1)
end
def read_into_buffer(buffer, size)
i = 0
while i < size
read_frame if @index >= @rbuf.length
# The read buffer has some data now, so copy bytes over to the output buffer.
byte = ::Thrift::TransportUtils.get_string_byte(@rbuf, @index)
::Thrift::TransportUtils.set_string_byte(buffer, i, byte)
@index += 1
i += 1
end
i
end
def write(buf,sz=nil)
return @transport.write(buf) unless @write
@wbuf << (sz ? buf[0...sz] : buf)
end
#
# Writes the output buffer to the stream in the format of a 4-byte length
# followed by the actual data.
#
def flush
return @transport.flush unless @write
out = [@wbuf.length].pack('N')
out << @wbuf
@transport.write(out)
@transport.flush
@wbuf = ''
end
private
def read_frame
sz = @transport.read_all(4).unpack('N').first
@index = 0
@rbuf = @transport.read_all(sz)
end
end
class FramedTransportFactory < BaseTransportFactory
def get_transport(transport)
return FramedTransport.new(transport)
end
end
end
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