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Diffstat (limited to '')
| -rw-r--r-- | src/jaegertracing/thrift/lib/perl/lib/Thrift/FramedTransport.pm | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/jaegertracing/thrift/lib/perl/lib/Thrift/FramedTransport.pm b/src/jaegertracing/thrift/lib/perl/lib/Thrift/FramedTransport.pm new file mode 100644 index 000000000..ba89ba3e0 --- /dev/null +++ b/src/jaegertracing/thrift/lib/perl/lib/Thrift/FramedTransport.pm @@ -0,0 +1,194 @@ +# +# 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. +# + +use 5.10.0; +use strict; +use warnings; + +use Thrift; +use Thrift::Transport; + +# +# Framed transport. Writes and reads data in chunks that are stamped with +# their length. +# +# @package thrift.transport +# +package Thrift::FramedTransport; +use base('Thrift::Transport'); +use version 0.77; our $VERSION = version->declare("$Thrift::VERSION"); + +sub new +{ + my $classname = shift; + my $transport = shift; + my $read = shift || 1; + my $write = shift || 1; + + my $self = { + transport => $transport, + read => $read, + write => $write, + wBuf => '', + rBuf => '', + }; + + return bless($self,$classname); +} + +sub isOpen +{ + my $self = shift; + return $self->{transport}->isOpen(); +} + +sub open +{ + my $self = shift; + + $self->{transport}->open(); +} + +sub close +{ + my $self = shift; + + if (defined $self->{transport}) { + $self->{transport}->close(); + } +} + +# +# Reads from the buffer. When more data is required reads another entire +# chunk and serves future reads out of that. +# +# @param int $len How much data +# +sub read +{ + + my $self = shift; + my $len = shift; + + if (!$self->{read}) { + return $self->{transport}->read($len); + } + + if (length($self->{rBuf}) == 0) { + $self->_readFrame(); + } + + + # Just return full buff + if ($len > length($self->{rBuf})) { + my $out = $self->{rBuf}; + $self->{rBuf} = ''; + return $out; + } + + # Return substr + my $out = substr($self->{rBuf}, 0, $len); + $self->{rBuf} = substr($self->{rBuf}, $len); + return $out; +} + +# +# Reads a chunk of data into the internal read buffer. +# (private) +sub _readFrame +{ + my $self = shift; + my $buf = $self->{transport}->readAll(4); + my @val = unpack('N', $buf); + my $sz = $val[0]; + + $self->{rBuf} = $self->{transport}->readAll($sz); +} + +# +# Writes some data to the pending output buffer. +# +# @param string $buf The data +# @param int $len Limit of bytes to write +# +sub write +{ + my $self = shift; + my $buf = shift; + my $len = shift; + + unless($self->{write}) { + return $self->{transport}->write($buf, $len); + } + + if ( defined $len && $len < length($buf)) { + $buf = substr($buf, 0, $len); + } + + $self->{wBuf} .= $buf; + } + +# +# Writes the output buffer to the stream in the format of a 4-byte length +# followed by the actual data. +# +sub flush +{ + my $self = shift; + + unless ($self->{write}) { + return $self->{transport}->flush(); + } + + my $out = pack('N', length($self->{wBuf})); + $out .= $self->{wBuf}; + $self->{transport}->write($out); + $self->{transport}->flush(); + $self->{wBuf} = ''; + +} + +# +# FramedTransport factory creates framed transport objects from transports +# +package Thrift::FramedTransportFactory; +use version 0.77; our $VERSION = version->declare("$Thrift::VERSION"); + +sub new { + my $classname = shift; + my $self = {}; + + return bless($self, $classname); +} + +# +# Build a framed transport from the base transport +# +# @return Thrift::FramedTransport transport +# +sub getTransport +{ + my $self = shift; + my $trans = shift; + + my $buffered = Thrift::FramedTransport->new($trans); + return $buffered; +} + +1; |