diff --git a/docs/README.rst b/docs/README.rst index e2e4dd36a..ed19b83fb 100644 --- a/docs/README.rst +++ b/docs/README.rst @@ -1,65 +1,242 @@ -tractor -======= -A `structured concurrent`_, async-native "`actor model`_" built on trio_ and multiprocessing_. +|logo| ``tractor``: next-gen Python parallelism |gh_actions| |docs| .. _actor model: https://en.wikipedia.org/wiki/Actor_model .. _trio: https://github.com/python-trio/trio -.. _multiprocessing: https://en.wikipedia.org/wiki/Multiprocessing +.. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing .. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles .. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich .. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228 -``tractor`` is an attempt to bring trionic_ `structured concurrency`_ to -distributed multi-core Python; it aims to be the Python multi-processing -framework *you always wanted*. +``tractor`` is a `structured concurrent`_ "`actor model`_" built on trio_ and multi-processing_. -``tractor`` lets you spawn ``trio`` *"actors"*: processes which each run -a ``trio`` scheduled task tree (also known as an `async sandwich`_). -*Actors* communicate by exchanging asynchronous messages_ and avoid -sharing any state. This model allows for highly distributed software -architecture which works just as well on multiple cores as it does over -many hosts. +We pair structured concurrency and true multi-core parallelism with +the aim of being the multi-processing framework *you always wanted*. The first step to grok ``tractor`` is to get the basics of ``trio`` down. A great place to start is the `trio docs`_ and this `blog post`_. -.. _messages: https://en.wikipedia.org/wiki/Message_passing -.. _trio docs: https://trio.readthedocs.io/en/latest/ -.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ -.. _structured concurrency: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ -.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts -.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony -.. _async generators: https://www.python.org/dev/peps/pep-0525/ + +Features +-------- +- **It's just** a ``trio`` API +- Infinitely nesteable process trees +- Built-in APIs for inter-process streaming +- A (first ever?) "native" multi-core debugger for Python using `pdb++`_ +- Support for multiple process spawning backends +- A modular transport layer, allowing for custom serialization, + communications protocols, and environment specific IPC primitives + + +Zombie safe: self-destruct a process tree +----------------------------------------- +``tractor`` tries to protect you from zombies, no matter what. + +.. code:: python + + """ + Run with a process monitor from a terminal using:: + + $TERM -e watch -n 0.1 "pstree -a $$" \ + & python examples/parallelism/we_are_processes.py \ + && kill $! + + """ + from multiprocessing import cpu_count + import os + + import tractor + import trio + + + async def target(): + print( + f"Yo, i'm '{tractor.current_actor().name}' " + f"running in pid {os.getpid()}" + ) + + await trio.sleep_forever() + + + async def main(): + + async with tractor.open_nursery() as n: + + for i in range(cpu_count()): + await n.run_in_actor(target, name=f'worker_{i}') + + print('This process tree will self-destruct in 1 sec...') + await trio.sleep(1) + + # you could have done this yourself + raise Exception('Self Destructed') + + + if __name__ == '__main__': + try: + trio.run(main) + except Exception: + print('Zombies Contained') + + +If you can create zombie child processes (without using a system signal) +it **is a bug**. + + +"Native" multi-process debugging +-------------------------------- +Using the magic of `pdb++`_ and our internal IPC, we've +been able to create a native feeling debugging experience for +any (sub-)process in your ``tractor`` tree. + +.. code:: python + + from os import getpid + + import tractor + import trio + + + async def breakpoint_forever(): + "Indefinitely re-enter debugger in child actor." + while True: + yield 'yo' + await tractor.breakpoint() + + + async def name_error(): + "Raise a ``NameError``" + getattr(doggypants) + async def main(): + """Test breakpoint in a streaming actor. + """ + async with tractor.open_nursery( + debug_mode=True, + loglevel='error', + ) as n: + + p0 = await n.start_actor('bp_forever', enable_modules=[__name__]) + p1 = await n.start_actor('name_error', enable_modules=[__name__]) + + # retreive results + stream = await p0.run(breakpoint_forever) + await p1.run(name_error) + + + if __name__ == '__main__': + trio.run(main) + + +You can run this with:: + + >>> python examples/debugging/multi_daemon_subactors.py + +And, yes, there's a built-in crash handling mode B) + +We're hoping to add a respawn-from-repl system soon! + + +Worker poolz are easy peasy +--------------------------- +The initial ask from most new users is *"how do I make a worker +pool thing?"*. + +``tractor`` is built to handle any SC (structured concurrent) process +tree you can imagine; a "worker pool" pattern is a trivial special +case. + +We have a `full re-implementation `_ of the std-lib's +``concurrent.futures.ProcessPoolExecutor`` example for reference. + +You can run it like so (from this dir) to see the process tree in +real time:: + + $TERM -e watch -n 0.1 "pstree -a $$" \ + & python examples/parallelism/concurrent_actors_primes.py \ + && kill $! + +This uses no extra threads, fancy semaphores or futures; all we need +is ``tractor``'s IPC! + + +.. _worker_pool: https://github.com/goodboy/tractor/blob/master/examples/parallelism/concurrent_actors_primes.py + Install ------- No PyPi release yet! -:: +From git:: pip install git+git://github.com/goodboy/tractor.git +Under the hood +-------------- +``tractor`` is an attempt to pair trionic_ `structured concurrency`_ with +distributed Python. You can think of it as a ``trio`` +*-across-processes* or simply as an opinionated replacement for the +stdlib's ``multiprocessing`` but built on async programming primitives +from the ground up. + +``tractor``'s nurseries let you spawn ``trio`` *"actors"*: new Python +processes which each run a ``trio`` scheduled runtime - a call to ``trio.run()``. + +Don't be scared off by this description. ``tractor`` **is just** ``trio`` +but with nurseries for process management and cancel-able streaming IPC. +If you understand how to work with ``trio``, ``tractor`` will give you +the parallelism you've been missing. + +"Actors" communicate by exchanging asynchronous messages_ and avoid +sharing state. The intention of this model is to allow for highly +distributed software that, through the adherence to *structured +concurrency*, results in systems which fail in predictable and +recoverable ways. + + +What's on the TODO: +------------------- +Help us push toward the future. + +- (Soon to land) ``asyncio`` support allowing for "infected" actors where + `trio` drives the `asyncio` scheduler via the astounding "`guest mode`_" +- Typed messaging protocols (ex. via ``msgspec``) +- Erlang-style supervisors via composed context managers + + Feel like saying hi? -------------------- This project is very much coupled to the ongoing development of ``trio`` (i.e. ``tractor`` gets most of its ideas from that brilliant community). If you want to help, have suggestions or just want to -say hi, please feel free to reach us on in our `matrix channel`_. If +say hi, please feel free to reach us in our `matrix channel`_. If matrix seems too hip, we're also mostly all in the the `trio gitter channel`_! .. _trio gitter channel: https://gitter.im/python-trio/general .. _matrix channel: https://matrix.to/#/!tractor:matrix.org +.. _pdb++: https://github.com/pdbpp/pdbpp +.. _guest mode: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops +.. _messages: https://en.wikipedia.org/wiki/Message_passing +.. _trio docs: https://trio.readthedocs.io/en/latest/ +.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ +.. _structured concurrency: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ +.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts +.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony +.. _async generators: https://www.python.org/dev/peps/pep-0525/ .. |gh_actions| image:: https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Fgoodboy%2Ftractor%2Fbadge&style=popout-square :target: https://actions-badge.atrox.dev/goodboy/tractor/goto + .. |docs| image:: https://readthedocs.org/projects/tractor/badge/?version=latest :target: https://tractor.readthedocs.io/en/latest/?badge=latest :alt: Documentation Status + +.. |logo| image:: _static/tractor_logo_side.svg + :width: 250 + :align: middle diff --git a/docs/github_readme/_sphinx_readme.rst b/docs/github_readme/_sphinx_readme.rst new file mode 100644 index 000000000..f277af16b --- /dev/null +++ b/docs/github_readme/_sphinx_readme.rst @@ -0,0 +1,109 @@ +tractor +======= +The Python async-native multi-core system *you always wanted*. + + +|gh_actions| +|docs| + +.. _actor model: https://en.wikipedia.org/wiki/Actor_model +.. _trio: https://github.com/python-trio/trio +.. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing +.. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles +.. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich +.. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228 + + +``tractor`` is a `structured concurrent`_ "`actor model`_" built on trio_ and multi-processing_. + +It is an attempt to pair trionic_ `structured concurrency`_ with +distributed Python. You can think of it as a ``trio`` +*-across-processes* or simply as an opinionated replacement for the +stdlib's ``multiprocessing`` but built on async programming primitives +from the ground up. + +Don't be scared off by this description. ``tractor`` **is just ``trio``** +but with nurseries for process management and cancel-able IPC. +If you understand how to work with ``trio``, ``tractor`` will give you +the parallelism you've been missing. + +``tractor``'s nurseries let you spawn ``trio`` *"actors"*: new Python +processes which each run a ``trio`` scheduled task tree (also known as +an `async sandwich`_ - a call to ``trio.run()``). That is, each +"*Actor*" is a new process plus a ``trio`` runtime. + +"Actors" communicate by exchanging asynchronous messages_ and avoid +sharing state. The intention of this model is to allow for highly +distributed software that, through the adherence to *structured +concurrency*, results in systems which fail in predictable and +recoverable ways. + +The first step to grok ``tractor`` is to get the basics of ``trio`` down. +A great place to start is the `trio docs`_ and this `blog post`_. + +.. _messages: https://en.wikipedia.org/wiki/Message_passing +.. _trio docs: https://trio.readthedocs.io/en/latest/ +.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ +.. _structured concurrency: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ +.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts +.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony +.. _async generators: https://www.python.org/dev/peps/pep-0525/ + + +Install +------- +No PyPi release yet! + +:: + + pip install git+git://github.com/goodboy/tractor.git + + +Alluring Features +----------------- +- **It's just** ``trio``, but with SC applied to processes (aka "actors") +- Infinitely nesteable process trees +- Built-in API for inter-process streaming +- A (first ever?) "native" multi-core debugger for Python using `pdb++`_ +- (Soon to land) ``asyncio`` support allowing for "infected" actors where + `trio` drives the `asyncio` scheduler via the astounding "`guest mode`_" + + +Example: self-destruct a process tree +------------------------------------- +.. literalinclude:: ../../examples/parallelism/we_are_processes.py + :language: python + + +The example you're probably after... +------------------------------------ +It seems the initial query from most new users is "how do I make a worker +pool thing?". + +``tractor`` is built to handle any SC process tree you can +imagine; the "worker pool" pattern is a trivial special case: + +.. literalinclude:: ../../examples/parallelism/concurrent_actors_primes.py + :language: python + + +Feel like saying hi? +-------------------- +This project is very much coupled to the ongoing development of +``trio`` (i.e. ``tractor`` gets most of its ideas from that brilliant +community). If you want to help, have suggestions or just want to +say hi, please feel free to reach us in our `matrix channel`_. If +matrix seems too hip, we're also mostly all in the the `trio gitter +channel`_! + +.. _trio gitter channel: https://gitter.im/python-trio/general +.. _matrix channel: https://matrix.to/#/!tractor:matrix.org +.. _pdb++: https://github.com/pdbpp/pdbpp +.. _guest mode: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops + + +.. |gh_actions| image:: https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Fgoodboy%2Ftractor%2Fbadge&style=popout-square + :target: https://actions-badge.atrox.dev/goodboy/tractor/goto +.. |docs| image:: https://readthedocs.org/projects/tractor/badge/?version=latest + :target: https://tractor.readthedocs.io/en/latest/?badge=latest + :alt: Documentation Status diff --git a/docs/github_readme/conf.py b/docs/github_readme/conf.py new file mode 100644 index 000000000..214278505 --- /dev/null +++ b/docs/github_readme/conf.py @@ -0,0 +1,51 @@ +# Configuration file for the Sphinx documentation builder. + +# this config is for the rst generation extension and thus +# requires only basic settings: +# https://github.com/sphinx-contrib/restbuilder + +# -- Path setup -------------------------------------------------------------- + +# If extensions (or modules to document with autodoc) are in another directory, +# add these directories to sys.path here. If the directory is relative to the +# documentation root, use os.path.abspath to make it absolute, like shown here. +# +# import os +# import sys +# sys.path.insert(0, os.path.abspath('.')) + +# Warn about all references to unknown targets +nitpicky = True + +# The master toctree document. +master_doc = '_sphinx_readme' + +# -- Project information ----------------------------------------------------- + +project = 'tractor' +copyright = '2018, Tyler Goodlet' +author = 'Tyler Goodlet' + +# The full version, including alpha/beta/rc tags +release = '0.0.0a0.dev0' + +# -- General configuration --------------------------------------------------- + +# Add any Sphinx extension module names here, as strings. They can be +# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom +# ones. +extensions = [ + 'sphinx.ext.autodoc', + 'sphinx.ext.intersphinx', + 'sphinx.ext.todo', + 'sphinxcontrib.restbuilder', + +] + +# Add any paths that contain templates here, relative to this directory. +templates_path = ['_templates'] + +# List of patterns, relative to source directory, that match files and +# directories to ignore when looking for source files. +# This pattern also affects html_static_path and html_extra_path. +exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store'] diff --git a/docs/mk_gh_readme.sh b/docs/mk_gh_readme.sh new file mode 100755 index 000000000..6f12dbe25 --- /dev/null +++ b/docs/mk_gh_readme.sh @@ -0,0 +1,4 @@ +#!/bin/bash +sphinx-build -b rst ./github_readme ./ + +mv _sphinx_readme.rst _README.rst diff --git a/examples/parallelism/we_are_processes.py b/examples/parallelism/we_are_processes.py index 8283b9c5b..755b89cfe 100644 --- a/examples/parallelism/we_are_processes.py +++ b/examples/parallelism/we_are_processes.py @@ -1,6 +1,9 @@ """ -Run with a process monitor from a terminal using: -$TERM -e watch -n 0.1 "pstree -a $$" & python examples/parallelism/we_are_processes.py && kill $! +Run with a process monitor from a terminal using:: + + $TERM -e watch -n 0.1 "pstree -a $$" \ + & python examples/parallelism/we_are_processes.py \ + && kill $! """ from multiprocessing import cpu_count @@ -11,8 +14,11 @@ async def target(): - print(f"Yo, i'm '{tractor.current_actor().name}' " - f"running in pid {os.getpid()}") + print( + f"Yo, i'm '{tractor.current_actor().name}' " + f"running in pid {os.getpid()}" + ) + await trio.sleep_forever()