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Datadog Agent RtLoader

CPython embedding/extending backend with support for multiple Python versions.

Concepts

RtLoader is a C++ wrapper around the CPython API with a C89-compatible public API that can be used by foreign languages like Go. In order to provide support for multiple Python versions, RtLoader fully abstracts Python in order to decouple client applications and CPython. Which Python version to use can be decided at runtime, RtLoader will dlopen the proper backend libraries accordingly.

Architecture

libdatadog-agent-rtloader

RtLoader exposes its C89-compatible API through include/datadog_agent_rtloader.h. By using the make3 function, the corresponding Python backend will be loaded at runtime. Under the hood the library provides RtLoader, a C++ interface that must be implemented by any supported backend, see include/rtloader.h for details.

Two and Three

libdatadog-agent-three library provides Python3 support. Python2 isn't supported anymore.

Common

The common folder contains C/C++ modules that are compiled into libdatadog-agent-three. Most of the code used to extend the embedded interpreter is there.

Requirements

  • C/C++ compiler
  • Python 3.12.x development packages
  • Cmake version 3.15 or above
  • Go compiler with cgo capabilities to run the tests

Optional Requirements

RTLoader can optionally show stack traces when a segfault happens, using execinfo, which is provided out of the box by the glibc. When building with other libc, you can install the shared libraries libexecinfo or libbacktrace instead. CMake should automatically pick it up so that you don't need to configure anything. If it doesn't, you can explicitly tell it where to find those by setting Backtrace_LIBRARY and Backtrace_INCLUDE_DIR options, eg. -DBacktrace_LIBRARY=/usr/lib/libexecinfo.so -DBacktrace_INCLUDE_DIR=/usr/include.

Build

RtLoader can be built using CMake. Run the configurator/generator first:

cmake .

Then just run make to build the project.

Examples

Test

Tests are written in Golang using cgo, run the testsuite from the root folder:

make -C test