orange / Orange / utils / addons.py

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from __future__ import absolute_import
"""
==============================
Add-on Management (``addons``)
==============================

.. index:: add-ons

Orange.utils.addons module provides a framework for Orange add-on management. As
soon as it is imported, the following initialization takes place: the list of
installed add-ons is loaded, their directories are added to python path
(:obj:`sys.path`) the callback list is initialized, the stored repository list is
loaded. The most important consequence of importing the module is thus the
injection of add-ons into the namespace.

"""

#TODO Document this module.

import shelve
import xmlrpclib
import warnings
import re
import pkg_resources
import tempfile
import tarfile
import zipfile
import shutil
import os
import sys
import platform
import subprocess
import urllib2
import urlparse
import posixpath
import site
import itertools

from collections import namedtuple, defaultdict
from contextlib import closing

import Orange.utils.environ

ADDONS_ENTRY_POINT="orange.addons"


OrangeAddOn = namedtuple('OrangeAddOn', ['name', 'available_version', 'installed_version', 'summary', 'description',
                                         'author', 'docs_url', 'keywords', 'homepage', 'package_url',
                                         'release_url', 'release_size', 'python_version'])
#It'd be great if we could somehow read a list and descriptions of widgets, show them in the dialog and enable
#search of add-ons based on keywords in widget names and descriptions.

INDEX_RE = "[^a-z0-9-']"  # RE for splitting entries in the search index

AOLIST_FILE = os.path.join(Orange.utils.environ.orange_settings_dir, "addons.shelve")

def open_addons():
    try:
        addons = shelve.open(AOLIST_FILE, 'c')
        if any(name != name.lower() for name, record in addons.items()):  # Try to read the whole list and check for sanity.
            raise Exception("Corrupted add-on list.")
    except:
        if os.path.isfile(AOLIST_FILE):
            os.remove(AOLIST_FILE)
        addons = shelve.open(AOLIST_FILE, 'n')
    return addons


def addons_corrupted():
    with closing(open_addons()) as addons:
        return len(addons) == 0

addon_refresh_callback = []

global index
index = defaultdict(list)
def rebuild_index():
    global index

    index = defaultdict(list)
    with closing(open_addons()) as addons:
        for name, ao in addons.items():
            for s in [name, ao.summary, ao.description, ao.author] + (ao.keywords if ao.keywords else []):
                if not s:
                    continue
                words = [word for word in re.split(INDEX_RE, s.lower())
                         if len(word)>1]
                for word in words:
                    for i in range(len(word)):
                        index[word[:i+1]].append(name)

def search_index(query):
    global index
    result = set()
    words = [word for word in re.split(INDEX_RE, query.lower()) if len(word)>1]
    if not words:
        with closing(open_addons()) as addons:
            return addons.keys()
    for word in words:
        result.update(index[word])
    return result

def refresh_available_addons(force=False, progress_callback=None):
    pypi = xmlrpclib.ServerProxy('http://pypi.python.org/pypi')
    if progress_callback:
        progress_callback(1, 0)

    pkg_dict = {}
    for data in pypi.search({'keywords': 'orange'}):
        name = data['name']
        order = data['_pypi_ordering']
        if name not in pkg_dict or pkg_dict[name][0] < order:
            pkg_dict[name] = (order, data['version'])

    try:
        import slumber
        readthedocs = slumber.API(base_url='http://readthedocs.org/api/v1/')
    except:
        readthedocs = None

    docs = {}
    if progress_callback:
        progress_callback(len(pkg_dict)+1, 1)
    with closing(open_addons()) as addons:
        for i, (name, (_, version)) in enumerate(pkg_dict.items()):
            if force or name not in addons or addons[name.lower()].available_version != version:
                try:
                    data = pypi.release_data(name, version)
                    rel = pypi.release_urls(name, version)[0]

                    if readthedocs:
                        try:
                            docs = readthedocs.project.get(slug=name.lower())['objects'][0]
                        except:
                            docs = {}
                    addons[name.lower()] = OrangeAddOn(name = name,
                                               available_version = data['version'],
                                               installed_version = addons[name.lower()].installed_version if name.lower() in addons else None,
                                               summary = data['summary'],
                                               description = data.get('description', ''),
                                               author = str((data.get('author', '') or '') + ' ' + (data.get('author_email', '') or '')).strip(),
                                               docs_url = data.get('docs_url', docs.get('subdomain', '')),
                                               keywords = data.get('keywords', "").split(","),
                                               homepage = data.get('home_page', ''),
                                               package_url = data.get('package_url', ''),
                                               release_url = rel.get('url', None),
                                               release_size = rel.get('size', -1),
                                               python_version = rel.get('python_version', None))
                except Exception, e:
                    import traceback
                    traceback.print_exc()
                    warnings.warn('Could not load data for the following add-on: %s'%name)
            if progress_callback:
                progress_callback(len(pkg_dict)+1, i+2)

    rebuild_index()

def load_installed_addons():
    found = set()
    with closing(open_addons()) as addons:
        for entry_point in pkg_resources.iter_entry_points(ADDONS_ENTRY_POINT):
            name, version = entry_point.dist.project_name, entry_point.dist.version
            #TODO We could import setup.py from entry_point.location and load descriptions and such ...
            if name.lower() in addons:
                addons[name.lower()] = addons[name.lower()]._replace(installed_version = version)
            else:
                addons[name.lower()] = OrangeAddOn(name = name,
                    available_version = None,
                    installed_version = version,
                    summary = "",
                    description = "",
                    author = "",
                    docs_url = "",
                    keywords = "",
                    homepage = "",
                    package_url = "",
                    release_url = "",
                    release_size = None,
                    python_version = None)
            found.add(name.lower())
        for name in set(addons).difference(found):
            addons[name.lower()] = addons[name.lower()]._replace(installed_version = None)
    rebuild_index()


def open_archive(path, mode="r"):
    """
    Return an open archive file object (zipfile.ZipFile or tarfile.TarFile).
    """
    _, ext = os.path.splitext(path)
    if ext == ".zip":
        # TODO: should it also open .egg, ...
        archive = zipfile.ZipFile(path, mode)

    elif ext in (".tar", ".gz", ".bz2", ".tgz", ".tbz2", ".tb2"):
        archive = tarfile.open(path, mode)

    return archive


member_info = namedtuple(
    "member_info",
    ["info",  # original info object (Tar/ZipInfo)
     "path",  # filename inside the archive
     "linkname",  # linkname if applicable
     "issym",  # True if sym link
     "islnk",  # True if hardlink
     ]
)


def archive_members(archive):
    """
    Given an open archive return an iterator of `member_info` instances.
    """
    if isinstance(archive, zipfile.ZipFile):
        def converter(info):
            return member_info(info, info.filename, None, False, False)

        return itertools.imap(converter, archive.infolist())
    elif isinstance(archive, tarfile.TarFile):
        def converter(info):
            return member_info(info, info.name, info.linkname,
                               info.issym(), info.islnk())
        return itertools.imap(converter, archive.getmembers())
    else:
        raise TypeError


def resolve_path(path):
    """
    Return a normalized real path.
    """
    return os.path.normpath(os.path.realpath(os.path.abspath(path)))


def is_badfile(member, base_dir):
    """
    Would extracting `member_info` instance write outside of `base_dir`.
    """
    path = member.path
    full_path = resolve_path(os.path.join(base_dir, path))
    return not full_path.startswith(base_dir)


def is_badlink(member, base_dir):
    """
    Would extracting `member_info` instance create a link to outside
    of `base_dir`.

    """
    if member.issym or member.islnk:
        dirname = os.path.dirname(member.path)
        full_path = resolve_path(os.path.join(dirname, member.linkname))
        return not full_path.startswith(base_dir)
    else:
        return False


def check_safe(member, base_dir):
    """
    Check if member is safe to extract to base_dir or raise an exception.
    """
    path = member.path
    drive, path = os.path.splitdrive(path)

    if drive != "":
        raise ValueError("Absolute path in archive")

    if path.startswith("/"):
        raise ValueError("Absolute path in archive")

    base_dir = resolve_path(base_dir)

    if is_badfile(member, base_dir):
        raise ValueError("Extract outside %r" % base_dir)
    if is_badlink(member, base_dir):
        raise ValueError("Link outside %r" % base_dir)

    return True


def extract_archive(archive, path="."):
    """
    Extract the contents of `archive` to `path`.
    """
    if isinstance(archive, basestring):
        archive = open_archive(archive)

    members = archive_members(archive)

    for member in members:
        if check_safe(member, path):
            archive.extract(member.info, path)


def run_setup(setup_script, args):
    """
    Run `setup_script` with `args` in a subprocess, using
    :ref:`subprocess.check_output`.

    """
    source_root = os.path.dirname(setup_script)
    executable = sys.executable
    extra_kwargs = {}
    if os.name == "nt" and os.path.basename(executable) == "pythonw.exe":
        dirname, _ = os.path.split(executable)
        executable = os.path.join(dirname, "python.exe")
        # by default a new console window would show up when executing the
        # script
        startupinfo = subprocess.STARTUPINFO()
        startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
        extra_kwargs["startupinfo"] = startupinfo

    subprocess.check_output([executable, setup_script] + args,
                             cwd=source_root,
                             stderr=subprocess.STDOUT,
                             **extra_kwargs)


def install(name, progress_callback=None):
    if progress_callback:
        progress_callback(1, 0)

    with closing(open_addons()) as addons:
        addon = addons[name.lower()]
    release_url = addon.release_url

    try:
        tmpdir = tempfile.mkdtemp()

        stream = urllib2.urlopen(release_url, timeout=120)

        parsed_url = urlparse.urlparse(release_url)
        package_name = posixpath.basename(parsed_url.path)
        package_path = os.path.join(tmpdir, package_name)

        progress_cb = (lambda value: progress_callback(value, 0)) \
                      if progress_callback else None
        with open(package_path, "wb") as package_file:
            Orange.utils.copyfileobj(
                stream, package_file, progress=progress_cb)

        extract_archive(package_path, tmpdir)

        setup_py = os.path.join(tmpdir, name + '-' + addon.available_version,
                                'setup.py')

        if not os.path.isfile(setup_py):
            raise Exception("Unable to install add-on - it is not properly "
                            "packed.")

        switches = []
        if site.USER_SITE in sys.path:   # we're not in a virtualenv
            switches.append('--user')
        run_setup(setup_py, ['install'] + switches)
    finally:
        shutil.rmtree(tmpdir, ignore_errors=True)

    for p in list(sys.path):
        site.addsitedir(p)
    reload(pkg_resources)
    for p in list(sys.path):
        pkg_resources.find_distributions(p)
    from orngRegistry import load_new_addons
    load_new_addons()
    load_installed_addons()
    for func in addon_refresh_callback:
        func()

def uninstall(name, progress_callback=None):
    try:
        import pip.req
        ao = pip.req.InstallRequirement(name, None)
        ao.uninstall(True)
    except ImportError:
        raise Exception("Pip is required for add-on uninstallation. Install pip and try again.")

def upgrade(name, progress_callback=None):
    install(name, progress_callback)

load_installed_addons()



# Support for loading legacy "registered" add-ons
def __read_addons_list(addons_file, systemwide):
    if os.path.isfile(addons_file):
        return [tuple([x.strip() for x in lne.split("\t")])
                for lne in file(addons_file, "rt")]
    else:
        return []

registered = __read_addons_list(os.path.join(Orange.utils.environ.orange_settings_dir, "add-ons.txt"), False) + \
             __read_addons_list(os.path.join(Orange.utils.environ.install_dir, "add-ons.txt"), True)

for name, path in registered:
    for p in [os.path.join(path, "widgets", "prototypes"),
          os.path.join(path, "widgets"),
          path,
          os.path.join(path, "lib-%s" % "-".join(( sys.platform, "x86" if (platform.machine()=="")
          else platform.machine(), ".".join(map(str, sys.version_info[:2])) )) )]:
        if os.path.isdir(p) and not any([Orange.utils.environ.samepath(p, x)
                                         for x in sys.path]):
            if p not in sys.path:
                sys.path.insert(0, p)

#TODO Show some progress to the user at least during the installation procedure.
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
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