Turn pygopath into full pygolang

Not only we can import modules by full path, but now we can also spawn
threads/coroutines and exchange data in between them with the same
primitives and semantic as in Go.

The bulk of new functionality is copied from here:

	kirr/go123@9e1aa6ab

Original commit description follows:

"""
golang: New _Python_ package to provide Go-like features to Python language
- `go` spawns lightweight thread.
- `chan` and `select` provide channels with Go semantic.
- `method` allows to define methods separate from class.
- `gimport` allows to import python modules by full path in a Go workspace.

The focus of first draft was on usage interface and on correctness, not speed.
In particular select should be fully working.

If there is a chance I will maybe try to followup with gevent-based
implementation in the future.
Hide whitespace changes
"""
parent 9c61f254
Pygopath is free software licensed under GPLv3+ with additional permission
Pygolang is free software licensed under GPLv3+ with additional permission
to link, combine and redistribute it with other free or open source software.
Please see https://www.nexedi.com/licensing for rationale and options.
......
recursive-include testdata *.py
recursive-include golang/testdata *.py
=================================================================
Pygopath - Import python modules by full path in a Go workspace
=================================================================
========================================
Pygolang - Go-like features for Python
========================================
Module `gopath` provides way to import python modules by full path in a Go workspace.
Package golang provides Go-like features for Python:
- `go` spawns lightweight thread.
- `chan` and `select` provide channels with Go semantic.
- `method` allows to define methods separate from class.
- `gimport` allows to import python modules by full path in a Go workspace.
Goroutines and channels
-----------------------
`go` spawns a thread, or a coroutine if gevent was activated. It is possible to
exchange data in between either threads or coroutines via channels. `chan`
creates a new channel with Go semantic - either synchronous or buffered. Use
`chan.recv`, `chan.send` and `chan.close` for communication. `select` can be
used to multiplex on several channels. For example::
ch1 = chan() # synchronous channel
ch2 = chan(3) # channel with buffer of size 3
def _():
ch1.send('a')
ch2.send('b')
go(_)
ch1.recv() # will give 'a'
ch2.recv_() # will give ('b', True)
_, _rx = select(
ch1.recv, # 0
ch2.recv_, # 1
(ch2.send, obj2), # 2
default, # 3
)
if _ == 0:
# _rx is what was received from ch1
...
if _ == 1:
# _rx is (rx, ok) of what was received from ch2
...
if _ == 2:
# we know obj2 was sent to ch2
...
if _ == 3:
# default case
...
Methods
-------
`method` decorator allows to define methods separate from class.
For example::
@method(MyClass)
def my_method(self, ...):
...
will define `MyClass.my_method()`.
Import
------
`gimport` provides way to import python modules by full path in a Go workspace.
For example
::
lonet = gopath.gimport('lab.nexedi.com/kirr/go123/xnet/lonet')
lonet = gimport('lab.nexedi.com/kirr/go123/xnet/lonet')
will import either
......
This diff is collapsed.
......@@ -16,7 +16,7 @@
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
"""Module gopath provides way to import python modules by full path in a Go workspace.
"""Module _gopath provides way to import python modules by full path in a Go workspace.
For example
......@@ -56,8 +56,8 @@ def _gimport(name):
# reason: if we leave dots in place, python emits warning:
# RuntimeWarning: Parent module 'lab.nexedi' not found while handling absolute import
#
# we put every imported module under `gopath.` namespace with '.' changed to '_'
modname = 'gopath.' + name.replace('.', '_')
# we put every imported module under `golang._gopath.` namespace with '.' changed to '_'
modname = 'golang._gopath.' + name.replace('.', '_')
try:
return sys.modules[modname]
......
......@@ -18,7 +18,7 @@
# See https://www.nexedi.com/licensing for rationale and options.
import os, os.path
from gopath import gimport
from golang._gopath import gimport
GOPATH_orig = None
......
# -*- coding: utf-8 -*-
# Copyright (C) 2018 Nexedi SA and Contributors.
# Kirill Smelkov <kirr@nexedi.com>
#
# This program is free software: you can Use, Study, Modify and Redistribute
# it under the terms of the GNU General Public License version 3, or (at your
# option) any later version, as published by the Free Software Foundation.
#
# You can also Link and Combine this program with other software covered by
# the terms of any of the Free Software licenses or any of the Open Source
# Initiative approved licenses and Convey the resulting work. Corresponding
# source of such a combination shall include the source code for all other
# software used.
#
# This program is distributed WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
"""Package gcompat provides Go-compatibility layer for Python"""
# qq is substitute for %q, which is missing in python.
#
# (python's automatic escape uses smartquotes quoting with either ' or ").
def qq(obj):
# go: like %s, %q automatically converts to string
if not isinstance(obj, basestring):
obj = str(obj)
return _quote(obj)
# _quote quotes string into valid "..." string always quoted with ".
def _quote(s):
# TODO also accept unicode as input.
# TODO output printable UTF-8 characters as-is, but escape non-printable UTF-8 and invalid UTF-8 bytes.
outv = []
# we don't want ' to be escaped
for _ in s.split("'"):
# this escape almost everything except " character
# NOTE string_escape does not do smartquotes and always uses ' for quoting
# (repr(str) is the same except it does smartquoting picking ' or " automatically)
q = _.encode("string_escape")
q = q.replace('"', r'\"')
outv.append(q)
return '"' + "'".join(outv) + '"'
# -*- coding: utf-8 -*-
# Copyright (C) 2018 Nexedi SA and Contributors.
# Kirill Smelkov <kirr@nexedi.com>
#
# This program is free software: you can Use, Study, Modify and Redistribute
# it under the terms of the GNU General Public License version 3, or (at your
# option) any later version, as published by the Free Software Foundation.
#
# You can also Link and Combine this program with other software covered by
# the terms of any of the Free Software licenses or any of the Open Source
# Initiative approved licenses and Convey the resulting work. Corresponding
# source of such a combination shall include the source code for all other
# software used.
#
# This program is distributed WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
from golang.gcompat import qq
def test_qq():
testv = (
# in want without leading/trailing "
('', r""),
('\'', r"'"),
('"', r"\""),
('abc\ndef', r"abc\ndef"),
('a\'c\ndef', r"a'c\ndef"),
('a\"c\ndef', r"a\"c\ndef"),
# ('привет', r"привет"), TODO
)
for tin, twant in testv:
twant = '"' + twant + '"' # add lead/trail "
assert qq(tin) == twant
# -*- coding: utf-8 -*-
# Copyright (C) 2018 Nexedi SA and Contributors.
# Kirill Smelkov <kirr@nexedi.com>
#
# This program is free software: you can Use, Study, Modify and Redistribute
# it under the terms of the GNU General Public License version 3, or (at your
# option) any later version, as published by the Free Software Foundation.
#
# You can also Link and Combine this program with other software covered by
# the terms of any of the Free Software licenses or any of the Open Source
# Initiative approved licenses and Convey the resulting work. Corresponding
# source of such a combination shall include the source code for all other
# software used.
#
# This program is distributed WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
from golang import go, chan, select, default, _PanicError
from pytest import raises
import time, threading
# tdelay delays a bit.
#
# XXX needed in situations when we need to start with known ordering but do not
# have a way to wait properly for ordering event.
def tdelay():
time.sleep(1E-3) # 1ms
def test_chan():
# sync: pre-close vs send/recv
ch = chan()
ch.close()
assert ch.recv() == None
assert ch.recv_() == (None, False)
assert ch.recv_() == (None, False)
raises(_PanicError, "ch.send(0)")
raises(_PanicError, "ch.close()")
# sync: send vs recv
ch = chan()
def _():
ch.send(1)
assert ch.recv() == 2
ch.close()
go(_)
assert ch.recv() == 1
ch.send(2)
assert ch.recv_() == (None, False)
assert ch.recv_() == (None, False)
# sync: close vs send
ch = chan()
def _():
tdelay()
ch.close()
go(_)
raises(_PanicError, "ch.send(0)")
# close vs recv
ch = chan()
def _():
tdelay()
ch.close()
go(_)
assert ch.recv_() == (None, False)
# sync: close vs multiple recv
ch = chan()
done = chan()
mu = threading.Lock()
s = set()
def _():
assert ch.recv_() == (None, False)
with mu:
x = len(s)
s.add(x)
done.send(x)
for i in range(3):
go(_)
ch.close()
for i in range(3):
done.recv()
assert s == {0,1,2}
# buffered
ch = chan(3)
done = chan()
for _ in range(2):
for i in range(3):
assert len(ch) == i
ch.send(i)
assert len(ch) == i+1
for i in range(3):
assert ch.recv_() == (i, True)
assert len(ch) == 0
for i in range(3):
ch.send(i)
assert len(ch) == 3
def _():
tdelay()
assert ch.recv_() == (0, True)
done.send('a')
for i in range(1,4):
assert ch.recv_() == (i, True)
assert ch.recv_() == (None, False)
done.send('b')
go(_)
ch.send(3) # will block without receiver
assert done.recv() == 'a'
ch.close()
assert done.recv() == 'b'
def test_select():
# non-blocking try send: not ok
ch = chan()
_, _rx = select(
(ch.send, 0),
default,
)
assert (_, _rx) == (1, None)
# non-blocking try recv: not ok
_, _rx = select(
ch.recv,
default,
)
assert (_, _rx) == (1, None)
_, _rx = select(
ch.recv_,
default,
)
assert (_, _rx) == (1, None)
# non-blocking try send: ok
ch = chan()
done = chan()
def _():
i = 0
while 1:
x = ch.recv()
if x == 'stop':
break
assert x == i
i += 1
done.close()
go(_)
for i in range(10):
tdelay()
_, _rx = select(
(ch.send, i),
default,
)
assert (_, _rx) == (0, None)
ch.send('stop')
done.recv()
# non-blocking try recv: ok
ch = chan()
done = chan()
def _():
for i in range(10):
ch.send(i)
done.close()
go(_)
for i in range(10):
tdelay()
if i % 2:
_, _rx = select(
ch.recv,
default,
)
assert (_, _rx) == (0, i)
else:
_, _rx = select(
ch.recv_,
default,
)
assert (_, _rx) == (0, (i, True))
done.recv()
# blocking 2·send
ch1 = chan()
ch2 = chan()
done = chan()
def _():
tdelay()
assert ch1.recv() == 'a'
done.close()
go(_)
_, _rx = select(
(ch1.send, 'a'),
(ch2.send, 'b'),
)
assert (_, _rx) == (0, None)
done.recv()
assert len(ch1._sendq) == len(ch1._recvq) == 0
assert len(ch2._sendq) == len(ch2._recvq) == 0
# blocking 2·recv
ch1 = chan()
ch2 = chan()
done = chan()
def _():
tdelay()
ch1.send('a')
done.close()
go(_)
_, _rx = select(
ch1.recv,
ch2.recv,
)
assert (_, _rx) == (0, 'a')
done.recv()
assert len(ch1._sendq) == len(ch1._recvq) == 0
assert len(ch2._sendq) == len(ch2._recvq) == 0
# blocking send/recv
ch1 = chan()
ch2 = chan()
done = chan()
def _():
tdelay()
assert ch1.recv() == 'a'
done.close()
go(_)
_, _rx = select(
(ch1.send, 'a'),
ch2.recv,
)
assert (_, _rx) == (0, None)
done.recv()
assert len(ch1._sendq) == len(ch1._recvq) == 0
assert len(ch2._sendq) == len(ch2._recvq) == 0
# blocking recv/send
ch1 = chan()
ch2 = chan()
done = chan()
def _():
tdelay()
ch1.send('a')
done.close()
go(_)
_, _rx = select(
ch1.recv,
(ch2.send, 'b'),
)
assert (_, _rx) == (0, 'a')
done.recv()
assert len(ch1._sendq) == len(ch1._recvq) == 0
assert len(ch2._sendq) == len(ch2._recvq) == 0
# buffered ping-pong
ch = chan(1)
for i in range(10):
_, _rx = select(
(ch.send, i),
ch.recv,
)
assert _ == (i % 2)
assert _rx == (i - 1 if i % 2 else None)
# select vs select
for i in range(10):
ch1 = chan()
ch2 = chan()
done = chan()
def _():
_, _rx = select(
(ch1.send, 'a'),
(ch2.send, 'xxx2'),
)
assert (_, _rx) == (0, None)
_, _rx = select(
(ch1.send, 'yyy2'),
ch2.recv,
)
assert (_, _rx) == (1, 'b')
done.close()
go(_)
_, _rx = select(
ch1.recv,
(ch2.send, 'xxx1'),
)
assert (_, _rx) == (0, 'a')
_, _rx = select(
(ch1.send, 'yyy1'),
(ch2.send, 'b'),
)
assert (_, _rx) == (1, None)
done.recv()
assert len(ch1._sendq) == len(ch1._recvq) == 0
assert len(ch2._sendq) == len(ch2._recvq) == 0
# pygopath | pythonic package setup
# pygolang | pythonic package setup
from setuptools import setup, find_packages
# read file content
......@@ -7,20 +7,18 @@ def readfile(path):
return f.read()
setup(
name = 'pygopath',
version = '0.0.0.dev1',
description = 'Import python modules by full-path in Go workspace',
name = 'pygolang',
version = '0.0.0.dev2',
description = 'Go-like features for Python',
long_description = readfile('README.rst'),
url = 'https://lab.nexedi.com/kirr/pygopath',
url = 'https://lab.nexedi.com/kirr/pygolang',
license = 'GPLv3+ with wide exception for Open-Source',
author = 'Kirill Smelkov',
author_email= 'kirr@nexedi.com',
keywords = 'go GOPATH python import',
keywords = 'go channel goroutine GOPATH python import',
# XXX find_packages does not find top-level *.py
#packages = find_packages(),
packages = [''],
packages = find_packages(),
extras_require = {
'test': ['pytest'],
......
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