Minimal, modern embedded V8 for Python.
Project description
Minimal, modern embedded V8 for Python.
Free software: ISC license
Features
Unicode support
Thread safe
Re-usable contexts
Binary object is Python agnostic
MiniRacer can be easily used by Django or Flask projects to minify assets, run babel or compile CoffeeScript.
Examples
py_mini_racer is straightforward to use:
>>> from py_mini_racer import py_mini_racer
>>> ctx = py_mini_racer.MiniRacer()
>>> ctx.eval('1+1')
2
>>> ctx.eval("var x = {company: 'Sqreen'}; x.company")
u'Sqreen'
>>> print ctx.eval(u"'\N{HEAVY BLACK HEART}'")
❤
>>> ctx.eval("var fun = () => ({ foo: 1 });")
>>> ctx.call("fun")
{u'foo': 1}
Variables are kept inside of a context:
>>> ctx.eval("x.company")
u'Sqreen'
You can give directly a custom JSON encoder when sending non-JSON encodable parameters:
import json
from datetime import datetime
class CustomEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, datetime):
return obj.isoformat()
return json.JSONEncoder.default(self, obj)
>>> ctx.eval("var f = function(args) { return args; }")
>>> ctx.call("f", datetime.now(), encoder=CustomEncoder)
u'2017-03-31T16:51:02.474118'
PyMiniRacer is ES6 capable:
>>> ctx.eval("[1,2,3].includes(5)")
False
V8 heap information can be retrieved:
>>> ctx.heap_stats()
{u'total_physical_size': 1613896,
u'used_heap_size': 1512520,
u'total_heap_size': 3997696,
u'total_heap_size_executable': 3145728,
u'heap_size_limit': 1501560832}
Compatibility
PyMiniRacer is compatible with Python 2 and Python 3. Wheels are generated for python 2.7 and python 3.4 to python 3.6.
Binary builds availability
The PyMiniRacer binary builds have been tested on x86_64 with:
OSX 10.10
Ubuntu >= 12.04
Debian >= 7
CentOS >= 6
You need pip >= 8.1 to install the wheels - you can check and upgrade yours in this way:
$ pip --version
$ pip install --upgrade pip
It should work on any Linux with a libc >= 2.12 and a wheel compatible pip (>= 8.1).
If you have a up-to-date pip and it doesn’t use a wheel, you might have an environment for which no wheel is built. Please open an issue.
Installation
We built Python wheels (prebuilt binaries) for OSX 64 bits and Linux 64 bits - most recent distributions. You need pip >= 1.4 and setuptools >= 0.8.
$ pip install py-mini-racer
Build
You can build v8 with the command:
$ python setup.py build_v8
You can also build the ctype extension:
$ python setup.py build_ext
Which automatically builds v8.
You can generate a wheel with the command:
$ python setup.py bdist_wheel
which builds v8, the extension, and generates a wheel.
Notes for building on OSX
- The legacy Python binary builds (OSX 10.6) need to be downloaded from:
They will allow to build a wheel compatible with former OSX versions.
Tests
If you want to run the tests, you need to build V8 first, then launch:
$ python setup.py test --addopts tests
Credits
Built with love by Sqreen.
PyMiniRacer launch was described in this blog post.
PyMiniRacer is inspired by mini_racer, built for the Ruby world by Sam Saffron.
Tools used in rendering this package:
Todo
Export V8 version. Fix circular structures export.
History
UNRELEASED
0.1.13 (2018-03-15)
Add heap_stats function
Fix issue with returned strings containing null bytes
0.1.12 (2018-17-04)
Remove dependency to enum
0.1.11 (2017-07-11)
Add compatibility for centos6
0.1.10 (2017-03-31)
Add the possibility to pass a custom JSON encoder in call.
0.1.9 (2017-03-24)
Fix the compilation for Ubuntu 12.04 and glibc < 2.17.
0.1.8 (2017-03-02)
Update targets build for better compatibility with old Mac OS X and linux platforms.
0.1.7 (2016-10-04)
Improve general performances of the JS execution.
Add the possibility to build a different version of V8 (for example with debug symbols).
Fix a conflict that could happens between statically linked libraries and dynamic ones.
0.1.6 (2016-08-12)
Add error message when py_mini_racer sdist fails to build asking to update pip in order to download the pre-compiled wheel instead of the source distribution.
0.1.5 (2016-08-04)
Build py_mini_racer against a static Python. When built against a shared library python, it doesn’t work with a static Python.
0.1.4 (2016-08-04)
Ensure JSEvalException message is converted to unicode
0.1.3 (2016-08-04)
Fix extension loading for python3
Add a make target for building distributions (sdist + wheels)
Fix eval conversion for python 3
0.1.2 (2016-08-03)
Fix date support
Fix Dockerfile for generating python3 wheels
0.1.1 (2016-08-02)
Fix sdist distribution.
0.1.0 (2016-08-01)
First release on PyPI.
Project details
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