Document installation for OSX (cannot import name constants)

[nitinbodke]

I am trying to install Graphite. I am stuck upon cairo installation.
I came across "http://stackoverflow.com/questions/11491268/install-pycairo-in-virtualenv".
I have installed cairocffi in my virtual environment.

My environment is:
"OS X: 10.8.5
Python: 2.7.2
Virtual Env:
pip list
cairocffi (0.5.1)
ceres (0.10.0)
cffi (0.8.1)
Django (1.5.5)
django-tagging (0.3.1)
pip (1.5)
pycparser (2.10)
setuptools (2.0.2)
Twisted (11.1.0)
txAMQP (0.6.2)
whisper (0.9.12)
wsgiref (0.1.2)
zope.interface (4.0.5)"

Cairo:
I have installed cairo using macports.
"cairo @1.12.16_2+x11 (active)"

I started graphite with following sequence of commands:

1. source /opt/graphite/bin/activate
2. sudo /opt/graphite/bin/carbon-cache.py start
3. sudo ./bin/run-graphite-devel-server.py /opt/graphite

http://0.0.0.0:8080/ is displaying Graphite home page.
But http://0.0.0.0:8080/render produces following traceback:

Traceback (most recent call last):
  File "/opt/graphite/lib/python2.7/site-packages/django/core/handlers/base.py", line 103, in get_response
    resolver_match = resolver.resolve(request.path_info)
  File "/opt/graphite/lib/python2.7/site-packages/django/core/urlresolvers.py", line 321, in resolve
    sub_match = pattern.resolve(new_path)
  File "/opt/graphite/lib/python2.7/site-packages/django/core/urlresolvers.py", line 321, in resolve
    sub_match = pattern.resolve(new_path)
  File "/opt/graphite/lib/python2.7/site-packages/django/core/urlresolvers.py", line 223, in resolve
    return ResolverMatch(self.callback, args, kwargs, self.name)
  File "/opt/graphite/lib/python2.7/site-packages/django/core/urlresolvers.py", line 230, in callback
    self._callback = get_callable(self._callback_str)
  File "/opt/graphite/lib/python2.7/site-packages/django/utils/functional.py", line 31, in wrapper
    result = func(*args)
  File "/opt/graphite/lib/python2.7/site-packages/django/core/urlresolvers.py", line 97, in get_callable
    mod = import_module(mod_name)
  File "/opt/graphite/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/opt/graphite/webapp/graphite/render/views.py", line 36, in <module>
    from graphite.render.evaluator import evaluateTarget
  File "/opt/graphite/webapp/graphite/render/evaluator.py", line 47, in <module>
    from graphite.render.functions import SeriesFunctions
  File "/opt/graphite/webapp/graphite/render/functions.py", line 33, in <module>
    from graphite.render.glyph import format_units
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 15, in <module>
    import cairocffi as cairo
  File "/opt/graphite/lib/python2.7/site-packages/cairocffi/__init__.py", line 16, in <module>
    from . import constants
ImportError: cannot import name constants

[SimonSapin]

What files does /opt/graphite/lib/python2.7/site-packages/cairocffi contain? Does it not contain constants.py? Try this (assuming you used sudo to create the virtualenv. Otherwise remove sudo from these lines.)

source /opt/graphite/bin/activate
sudo pip uninstall cairocffi
sudo pip install git+https://github.com/SimonSapin/cairocffi.git

What’s the entire output of the above? Does it fix the issue?

[nitinbodke]

Yes, it do contain constants.py.
I followed above steps, but that didn't help.
Below is the version that gets installed with above command.
"cairocffi (0.5.1)"
It's the same as earlier one.

[SimonSapin]

Ok. Add these lines to /opt/graphite/lib/python2.7/site-packages/cairocffi/__init__.py, before from . import constants

print(sys.path)
print(__path__)

You should now get two additional lines of output, before the traceback. What do they contain?

[nitinbodke]

['/opt/graphite/webapp', '/opt/graphite/webapp', '/opt/graphite/bin', '/opt/graphite/lib/python27.zip', '/opt/graphite/lib/python2.7', '/opt/graphite/lib/python2.7/plat-darwin', '/opt/graphite/lib/python2.7/plat-mac', '/opt/graphite/lib/python2.7/plat-mac/lib-scriptpackages', '/opt/graphite/Extras/lib/python', '/opt/graphite/lib/python2.7/lib-tk', '/opt/graphite/lib/python2.7/lib-old', '/opt/graphite/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/opt/graphite/lib/python2.7/site-packages', '/opt/graphite/webapp/graphite/thirdparty']
['/opt/graphite/lib/python2.7/site-packages/cairocffi']"

[SimonSapin]

I’m sorry, I have no idea what’s going on there… Everything looks like it should work.

Does this work, when Graphite is not involved?

/opt/graphite/bin/python -c 'import cairocffi'

[nitinbodke]

Something wrong with my environment. Yesterdays fix is not working. Let me go through it.

(graphite)$ python
Python 2.7.2 (default, Oct 11 2012, 20:14:37) 
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cffi
>>> import cairocffi
['', '/opt/graphite/lib/python27.zip', '/opt/graphite/lib/python2.7', '/opt/graphite/lib/python2.7/plat-darwin', '/opt/graphite/lib/python2.7/plat-mac', '/opt/graphite/lib/python2.7/plat-mac/lib-scriptpackages', '/opt/graphite/Extras/lib/python', '/opt/graphite/lib/python2.7/lib-tk', '/opt/graphite/lib/python2.7/lib-old', '/opt/graphite/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/opt/graphite/lib/python2.7/site-packages']
['/opt/graphite/lib/python2.7/site-packages/cairocffi']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/graphite/lib/python2.7/site-packages/cairocffi/__init__.py", line 41, in <module>
    cairo = dlopen(ffi, 'libcairo.so.2', 'libcairo-2.dll', 'cairo', 'libcairo-2', 'libcairo.2.dylib')
  File "/opt/graphite/lib/python2.7/site-packages/cairocffi/__init__.py", line 36, in dlopen
    return ffi.dlopen(names[0])  # pragma: no cover
  File "/opt/graphite/lib/python2.7/site-packages/cffi/api.py", line 117, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "/opt/graphite/lib/python2.7/site-packages/cffi/api.py", line 399, in _make_ffi_library
    backendlib = backend.load_library(name, flags)
OSError: cannot load library libcairo.so.2: dlopen(libcairo.so.2, 2): image not found
>>> import cffi; cffi.FFI().dlopen('libcairo.2.dylib')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/graphite/lib/python2.7/site-packages/cffi/api.py", line 117, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "/opt/graphite/lib/python2.7/site-packages/cffi/api.py", line 399, in _make_ffi_library
    backendlib = backend.load_library(name, flags)
OSError: cannot load library libcairo.2.dylib: dlopen(libcairo.2.dylib, 2): image not found
>>> 

[hanneshapke]

@nitinbodke Did you solve the environment problem at the end? I am facing the same problem now and have no idea where to continue fixing the problem. Any advice is highly appreciated.

Thank you.

[SimonSapin]

@hanneshapke Please describe exact step to setup your environment and reproduce the bug, and copy any traceback or other output here. Also do as in #29 (comment) and copy the output here.

[hanneshapke]

Hi @SimonSapin thank you for offering your help

I am trying to install Weasyprint via pip on OSX10.7 and all requirements via brew.

HOMEBREW_VERSION: 0.9.5
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
OS X: 10.7.5-x86_64
Xcode: 4.1
Python: /usr/local/bin/python => /usr/local/Cellar/python/2.7.2/bin/python

I have installed the required packages via

sudo brew install cairo pango gdk-pixbuf libxml2 libxslt libffi

Everything installs well and also the pip install works fine.

However, when I try to execute weasyprint --help I get the follow error with the copied trace back:

$weasyprint --help
Traceback (most recent call last):
  File "/usr/local/bin/weasyprint", line 8, in <module>
    load_entry_point('WeasyPrint==0.21', 'console_scripts', 'weasyprint')()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 318, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2221, in load_entry_point
    return ep.load()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 1954, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/Library/Python/2.7/site-packages/weasyprint/__init__.py", line 312, in <module>
    from .css import PARSER, preprocess_stylesheet
  File "/Library/Python/2.7/site-packages/weasyprint/css/__init__.py", line 30, in <module>
    from . import computed_values
  File "/Library/Python/2.7/site-packages/weasyprint/css/computed_values.py", line 18, in <module>
    from .. import text
  File "/Library/Python/2.7/site-packages/weasyprint/text.py", line 18, in <module>
    import cairocffi as cairo
  File "/Library/Python/2.7/site-packages/cairocffi/__init__.py", line 39, in <module>
    cairo = dlopen(ffi, 'libcairo.so.2', 'libcairo-2.dll', 'cairo', 'libcairo-2')
  File "/Library/Python/2.7/site-packages/cairocffi/__init__.py", line 34, in dlopen
    return ffi.dlopen(names[0])  # pragma: no cover
  File "/Library/Python/2.7/site-packages/cffi/api.py", line 119, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "/Library/Python/2.7/site-packages/cffi/api.py", line 412, in _make_ffi_library
    backendlib = _load_backend_lib(backend, libname, flags)
  File "/Library/Python/2.7/site-packages/cffi/api.py", line 401, in _load_backend_lib
    return backend.load_library(name, flags)
OSError: cannot load library libcairo.so.2: dlopen(libcairo.so.2, 2): image not found

The reinstall of cairocffi with sudo pip uninstall cairocffi didn't make an difference.

The print out of sys.path and __path__ is listed below

['/usr/local/bin', '/Library/Frameworks/SQLite3.framework/Versions/3/Python/2.7', '/Library/Frameworks/GDAL.framework/Versions/1.9/Python/2.7/site-packages', '/Library/Python/2.7/site-packages/pip-1.1-py2.7.egg', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages']

['/Library/Python/2.7/site-packages/cairocffi']

The test import of cairocffi brings up this error:

$ python -c 'import cairocffi'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named cairocffi

However cairocffi is installed

pip install cairocffi
Requirement already satisfied (use --upgrade to upgrade): cairocffi in /Library/Python/2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): cffi>=0.6 in /Library/Python/2.7/site-packages (from cairocffi)
Requirement already satisfied (use --upgrade to upgrade): pycparser in /Library/Python/2.7/site-packages (from cffi>=0.6->cairocffi)

Please let me know if you need further tracebacks

[hanneshapke]

sudo brew link --force cairo also did knot solve it for me.

[SimonSapin]

@hanneshapke this sounds like #28. I just pushed v0.5.3 to PyPI with a possible fix. Get it with pip install --upgrade cairocffi. Does it fix the issue for you?

[hanneshapke]

Unfortunately not, problem persists.
After the pip install --upgrade cairocffi, the error message is still

OSError: cannot load library libcairo.so.2: dlopen(libcairo.so.2, 2): image not found

I notice something interesting. I read through #28 and noticed the same problem that the imports don't work.

>>> import cffi; cffi.FFI().dlopen('cairo');
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named cffi

Could this maybe the issue?

[SimonSapin]

These look like two separate issues. Are you certain you’re using the same Python install and virtual environment (if any) in both cases?

[hanneshapke]

I think so. When I exit Python and run pip install cffi for example, I get the following message

pip install cffi
Requirement already satisfied (use --upgrade to upgrade): cffi in /Library/Python/2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): pycparser in /Library/Python/2.7/site-packages (from cffi)
Cleaning up...

Pretty sure these are the same environments.

[SimonSapin]

What’s the output of pip --version, which pip, which python, and python -c 'import sys; print(sys.prefix)'?