/ 
Protobuf-0.03
/ README.md

Protobuf - High-performance Perl Protocol Buffers using upb

Protobuf is a high-performance Protocol Buffers implementation for Perl, built upon the efficient upb C library. It provides a memory-safe, thread-isolated environment with advanced features like thread-local arena caching, SIMD-accelerated conversions, and zero-copy IPC support.

Features

Prerequisites

This Perl module requires Bazel to build the protoc-gen-perl-pb plugin. Ensure you have Bazel installed. The necessary C++ Protobuf libraries used by the plugin are typically fetched and built by Bazel as part of the main project's workspace setup.

Additionally, you'll need a C++ compiler (like g++), Make, and the Perl development headers.

To install Perl module dependencies, you can use cpanm:

# Install cpanminus and Carton
cpanm App::cpanminus Carton

# From the perl/ directory
carton install

This will install dependencies listed in the cpanfile.

Building the Plugin

The protoc-gen-perl-pb plugin is built automatically via Bazel when you run make in the perl/ directory, as configured in Makefile.PL.

Installation

To build and test the Perl module:

# From the perl/ directory
perl Makefile.PL
make -j$(nproc)
make test
sudo make install

To run a full clean test cycle, including rebuilding the plugin:

# From the perl/ directory
# Clean up previous Bazel run for the plugin
bazel --output_base=/usr/local/google/home/cjac/.gemini/tmp/protobuf/bazel_output_base clean --expunge
# Clean up MakeMaker build
make clean
# Regenerate Makefile and build everything including the plugin, then test
perl Makefile.PL && make -j$(nproc) && make test

Note: We use a specific Bazel output_base to ensure cache consistency between different shells. If you run Bazel commands manually in this workspace, you should use the same output base: alias bazel='bazel --output_base=/usr/local/google/home/cjac/.gemini/tmp/protobuf/bazel_output_base'

Code Generation

To translate a .proto schema file into Perl classes, you use the standard Protocol Buffers compiler protoc in combination with the custom protoc-gen-perl-pb plugin.

1. Build the Plugin

First, ensure that the plugin executable has been built in the perl directory by running:

make protoc-gen-perl-pb

This generates the executable file protoc-gen-perl-pb in the root of the perl directory.

[!NOTE] The file bin/protoc-gen-perl-pb tracked in the repository is a skeletal mock script. The actual compiled C++ plugin binary will be created in the root of the perl directory.

2. Generate Perl Classes

Run protoc specifying the path to our plugin and the output directory:

protoc --plugin=protoc-gen-perl-pb=./protoc-gen-perl-pb \
       --perl-pb_out=embed_descriptors=true:./lib \
       --proto_path=./proto \
       ./proto/my_service.proto

Flag Details:

3. Load the Generated Module

The plugin generates Perl modules matching the package namespace. If my_service.proto defines package google.cloud.test.v1;, it generates Google/Cloud/Test/V1/Service.pm under the target directory.

You can then load it in your Perl code by adding the target directory to @INC:

use lib 'lib';
use Google::Cloud::Test::V1::Service;

my $req = Google::Cloud::Test::V1::Service::HelloRequest->new(
    name => 'World',
);

Usage

use Protobuf::DescriptorPool;

my $pool = Protobuf::DescriptorPool->generated_pool();
$pool->add_serialized_file_descriptor_set($data);

my $msg = My::Generated::Message->new();
$msg->set_value(42);
my $wire = $msg->serialize();

License

This software is licensed under the Apache License 2.0.