ocrd_utils.os.itertree() - Code Metrics - Inspection of "Resmgr dynamic discovery" - OCR-D/core - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#800)

by Konstantin

created 2022-05-20 13:50 UTC

ocrd_utils.os.itertree() A

↳ Parent: ocrd_utils.os

Complexity

Conditions

Size

Total Lines	10
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	7
dl	0
loc	10
rs	10
c	0
b	0
f	0
cc	4
nop	1

"""
Operating system functions.
"""
__all__ = [
    'abspath',
    'directory_size',
    'is_file_in_directory',
    'get_ocrd_tool_json',
    'get_processor_resource_types',
    'pushd_popd',
    'unzip_file_to_dir',
    'atomic_write',
]

from tempfile import TemporaryDirectory
from functools import lru_cache
import contextlib
from distutils.spawn import find_executable as which
from json import loads
from json.decoder import JSONDecodeError
from os import getcwd, chdir, stat, chmod, umask, environ
from pathlib import Path
from os.path import exists, abspath as abspath_, join, isdir
from zipfile import ZipFile
from subprocess import run, PIPE

from atomicwrites import atomic_write as atomic_write_, AtomicWriter

from .constants import XDG_DATA_HOME

def abspath(url):
    """
    Get a full path to a file or file URL

    See os.abspath
    """
    if url.startswith('file://'):
        url = url[len('file://'):]
    return abspath_(url)

@contextlib.contextmanager
def pushd_popd(newcwd=None, tempdir=False):
    if newcwd and tempdir:
        raise Exception("pushd_popd can accept either newcwd or tempdir, not both")
    try:
        oldcwd = getcwd()
    except FileNotFoundError:
        # This happens when a directory is deleted before the context is exited
        oldcwd = '/tmp'
    try:
        if tempdir:
            with TemporaryDirectory() as tempcwd:
                chdir(tempcwd)
                yield tempcwd
        else:
            if newcwd:
                chdir(newcwd)
            yield newcwd
    finally:
        chdir(oldcwd)

def unzip_file_to_dir(path_to_zip, output_directory):
    """
    Extract a ZIP archive to a directory
    """
    z = ZipFile(path_to_zip, 'r')
    z.extractall(output_directory)
    z.close()

@lru_cache()
def get_ocrd_tool_json(executable):
    """
    Get the ``ocrd-tool`` description of ``executable``.
    """
    executable_name = Path(executable).name
    ocrd_tool = loads(run([executable, '--dump-json'], stdout=PIPE).stdout)
    if 'resource_locations' not in ocrd_tool:
        ocrd_tool['resource_locations'] = ['data', 'cwd', 'system', 'module']
    return ocrd_tool

# def get_processor_resources_list(executable):
#     """
#     Get the list of resources that a processor is providing via
#     ``-list-resources``
#     """

def list_resource_candidates(executable, fname, cwd=getcwd(), moduled=None, xdg_data_home=None):
    """
    Generate candidates for processor resources according to
    https://ocr-d.de/en/spec/ocrd_tool#file-parameters
    """
    candidates = []
    candidates.append(join(cwd, fname))
    xdg_data_home = XDG_DATA_HOME if not xdg_data_home else xdg_data_home
    processor_path_var = '%s_PATH' % executable.replace('-', '_').upper()
    if processor_path_var in environ:
        candidates += [join(x, fname) for x in environ[processor_path_var].split(':')]
    candidates.append(join(xdg_data_home, 'ocrd-resources', executable, fname))
    candidates.append(join('/usr/local/share/ocrd-resources', executable, fname))
    if moduled:
        candidates.append(join(moduled, fname))
    return candidates

def list_all_resources(executable, moduled=None, xdg_data_home=None):
    """
    List all processor resources in the filesystem according to
    https://ocr-d.de/en/spec/ocrd_tool#file-parameters
    """
    candidates = []
    try:
        resource_locations = get_ocrd_tool_json(executable)['resource_locations']
    except FileNotFoundError:
        # processor we're looking for ressource_locations of is not installed.
        # Assume the default
        resource_locations = ['data', 'cwd', 'system', 'module']
    xdg_data_home = XDG_DATA_HOME if not xdg_data_home else xdg_data_home
    # XXX cwd would list too many false positives
    # if 'cwd' in resource_locations:
    #     cwd_candidate = join(getcwd(), 'ocrd-resources', executable)
    #     if Path(cwd_candidate).exists():
    #         candidates.append(cwd_candidate)
    processor_path_var = '%s_PATH' % executable.replace('-', '_').upper()
    if processor_path_var in environ:
        for processor_path in environ[processor_path_var].split(':'):
            if Path(processor_path).is_dir():
                candidates += Path(processor_path).iterdir()
    if 'data' in resource_locations:
        datadir = Path(xdg_data_home, 'ocrd-resources', executable)
        if datadir.is_dir():
            candidates += datadir.iterdir()
    if 'system' in resource_locations:
        systemdir = Path('/usr/local/share/ocrd-resources', executable)
        if systemdir.is_dir():
            candidates += systemdir.iterdir()
    if 'module' in resource_locations and moduled:
        # recurse fully
        for resource in itertree(Path(moduled)):
            if resource.is_dir():
                continue
            if any(resource.match(pattern) for pattern in
                   # Python distributions do not distinguish between
                   # code and data; `is_resource()` only singles out
                   # files over directories; but we want data files only
                   # todo: more code and cache exclusion patterns!
                   ['*.py', '*.py[cod]', '*~', 'ocrd-tool.json']):
                continue
            candidates.append(resource)
    # recurse once
    for parent in candidates:
        if parent.is_dir() and parent.name != '.git':
            candidates += parent.iterdir()
    return sorted([str(x) for x in candidates])

def get_processor_resource_types(executable, ocrd_tool=None):
    """
    Determine what type of resource parameters a processor needs.

    Return a list of MIME types (with the special value `*/*` to
    designate that arbitrary files or directories are allowed).
    """
    if not ocrd_tool:
        # if the processor in question is not installed, assume both files and directories
        if not which(executable):
            return ['*/*']
        ocrd_tool = get_ocrd_tool_json(executable)
    if not next((True for p in ocrd_tool['parameters'].values() if 'content-type' in p), False):
        # None of the parameters for this processor are resources (or not
        # the resource parametrs are not properly declared, so output both
        # directories and files
        return ['*/*']
    return [p['content-type'] for p in ocrd_tool['parameters'].values()
            if 'content-type' in p]

# ht @pabs3
# https://github.com/untitaker/python-atomicwrites/issues/42
class AtomicWriterPerms(AtomicWriter):
    def get_fileobject(self, **kwargs):
        f = super().get_fileobject(**kwargs)
        try:
            mode = stat(self._path).st_mode
        except FileNotFoundError:
            # Creating a new file, emulate what os.open() does
            mask = umask(0)
            umask(mask)
            mode = 0o664 & ~mask
        fd = f.fileno()
        chmod(fd, mode)
        return f

@contextlib.contextmanager
def atomic_write(fpath):
    with atomic_write_(fpath, writer_cls=AtomicWriterPerms, overwrite=True) as f:
        yield f


def is_file_in_directory(directory, file):
    """
    Return True if ``file`` is in ``directory`` (by checking that all components of ``directory`` are in ``file.parts``)
    """
    directory = Path(directory)
    file = Path(file)
    return list(file.parts)[:len(directory.parts)] == list(directory.parts)

def itertree(path):
    """
    Generate a list of paths by recursively enumerating ``path``
    """
    if not isinstance(path, Path):
        path = Path(path)
    if path.is_dir():
        for subpath in path.iterdir():
            yield from itertree(subpath)
    yield path

def directory_size(path):
    """
    Calculcates size of all files in directory ``path``
    """
    path = Path(path)
    return sum(f.stat().st_size for f in path.glob('**/*') if f.is_file())


1			"""
2			Operating system functions.
3			"""
4			__all__ = [
5			'abspath',
6			'directory_size',
7			'is_file_in_directory',
8			'get_ocrd_tool_json',
9			'get_processor_resource_types',
10			'pushd_popd',
11			'unzip_file_to_dir',
12			'atomic_write',
13			]
14
15			from tempfile import TemporaryDirectory
16			from functools import lru_cache
17			import contextlib
18			from distutils.spawn import find_executable as which
19			from json import loads
20			from json.decoder import JSONDecodeError
21			from os import getcwd, chdir, stat, chmod, umask, environ
22			from pathlib import Path
23			from os.path import exists, abspath as abspath_, join, isdir
24			from zipfile import ZipFile
25			from subprocess import run, PIPE
26
27			from atomicwrites import atomic_write as atomic_write_, AtomicWriter
28
29			from .constants import XDG_DATA_HOME
30
31			def abspath(url):
32			"""
33			Get a full path to a file or file URL
34
35			See os.abspath
36			"""
37			if url.startswith('file://'):
38			url = url[len('file://'):]
39			return abspath_(url)
40
41			@contextlib.contextmanager
42			def pushd_popd(newcwd=None, tempdir=False):
43			if newcwd and tempdir:
44			raise Exception("pushd_popd can accept either newcwd or tempdir, not both")
45			try:
46			oldcwd = getcwd()
47			except FileNotFoundError:
48			# This happens when a directory is deleted before the context is exited
49			oldcwd = '/tmp'
50			try:
51			if tempdir:
52			with TemporaryDirectory() as tempcwd:
53			chdir(tempcwd)
54			yield tempcwd
55			else:
56			if newcwd:
57			chdir(newcwd)
58			yield newcwd
59			finally:
60			chdir(oldcwd)
61
62			def unzip_file_to_dir(path_to_zip, output_directory):
63			"""
64			Extract a ZIP archive to a directory
65			"""
66			z = ZipFile(path_to_zip, 'r')
67			z.extractall(output_directory)
68			z.close()
69
70			@lru_cache()
71			def get_ocrd_tool_json(executable):
72			"""
73			Get the ``ocrd-tool`` description of ``executable``.
74			"""
75			executable_name = Path(executable).name
76			ocrd_tool = loads(run([executable, '--dump-json'], stdout=PIPE).stdout)
77			if 'resource_locations' not in ocrd_tool:
78			ocrd_tool['resource_locations'] = ['data', 'cwd', 'system', 'module']
79			return ocrd_tool
80
81			# def get_processor_resources_list(executable):
82			# """
83			# Get the list of resources that a processor is providing via
84			# ``-list-resources``
85			# """
86
87			def list_resource_candidates(executable, fname, cwd=getcwd(), moduled=None, xdg_data_home=None):
88			"""
89			Generate candidates for processor resources according to
90			https://ocr-d.de/en/spec/ocrd_tool#file-parameters
91			"""
92			candidates = []
93			candidates.append(join(cwd, fname))
94			xdg_data_home = XDG_DATA_HOME if not xdg_data_home else xdg_data_home
95			processor_path_var = '%s_PATH' % executable.replace('-', '_').upper()
96			if processor_path_var in environ:
97			candidates += [join(x, fname) for x in environ[processor_path_var].split(':')]
98			candidates.append(join(xdg_data_home, 'ocrd-resources', executable, fname))
99			candidates.append(join('/usr/local/share/ocrd-resources', executable, fname))
100			if moduled:
101			candidates.append(join(moduled, fname))
102			return candidates
103
104			def list_all_resources(executable, moduled=None, xdg_data_home=None):
105			"""
106			List all processor resources in the filesystem according to
107			https://ocr-d.de/en/spec/ocrd_tool#file-parameters
108			"""
109			candidates = []
110			try:
111			resource_locations = get_ocrd_tool_json(executable)['resource_locations']
112			except FileNotFoundError:
113			# processor we're looking for ressource_locations of is not installed.
114			# Assume the default
115			resource_locations = ['data', 'cwd', 'system', 'module']
116			xdg_data_home = XDG_DATA_HOME if not xdg_data_home else xdg_data_home
117			# XXX cwd would list too many false positives
118			# if 'cwd' in resource_locations:
119			# cwd_candidate = join(getcwd(), 'ocrd-resources', executable)
120			# if Path(cwd_candidate).exists():
121			# candidates.append(cwd_candidate)
122			processor_path_var = '%s_PATH' % executable.replace('-', '_').upper()
123			if processor_path_var in environ:
124			for processor_path in environ[processor_path_var].split(':'):
125			if Path(processor_path).is_dir():
126			candidates += Path(processor_path).iterdir()
127			if 'data' in resource_locations:
128			datadir = Path(xdg_data_home, 'ocrd-resources', executable)
129			if datadir.is_dir():
130			candidates += datadir.iterdir()
131			if 'system' in resource_locations:
132			systemdir = Path('/usr/local/share/ocrd-resources', executable)
133			if systemdir.is_dir():
134			candidates += systemdir.iterdir()
135			if 'module' in resource_locations and moduled:
136			# recurse fully
137			for resource in itertree(Path(moduled)):
138			if resource.is_dir():
139			continue
140			if any(resource.match(pattern) for pattern in
141			# Python distributions do not distinguish between
142			# code and data; `is_resource()` only singles out
143			# files over directories; but we want data files only
144			# todo: more code and cache exclusion patterns!
145			['.py', '.py[cod]', '*~', 'ocrd-tool.json']):
146			continue
147			candidates.append(resource)
148			# recurse once
149			for parent in candidates:
150			if parent.is_dir() and parent.name != '.git':
151			candidates += parent.iterdir()
152			return sorted([str(x) for x in candidates])
153
154			def get_processor_resource_types(executable, ocrd_tool=None):
155			"""
156			Determine what type of resource parameters a processor needs.
157
158			Return a list of MIME types (with the special value `/` to
159			designate that arbitrary files or directories are allowed).
160			"""
161			if not ocrd_tool:
162			# if the processor in question is not installed, assume both files and directories
163			if not which(executable):
164			return ['/']
165			ocrd_tool = get_ocrd_tool_json(executable)
166			if not next((True for p in ocrd_tool['parameters'].values() if 'content-type' in p), False):
167			# None of the parameters for this processor are resources (or not
168			# the resource parametrs are not properly declared, so output both
169			# directories and files
170			return ['/']
171			return [p['content-type'] for p in ocrd_tool['parameters'].values()
172			if 'content-type' in p]
173
174			# ht @pabs3
175			# https://github.com/untitaker/python-atomicwrites/issues/42
176			class AtomicWriterPerms(AtomicWriter):
177			def get_fileobject(self, **kwargs):
178			f = super().get_fileobject(**kwargs)
179			try:
180			mode = stat(self._path).st_mode
181			except FileNotFoundError:
182			# Creating a new file, emulate what os.open() does
183			mask = umask(0)
184			umask(mask)
185			mode = 0o664 & ~mask
186			fd = f.fileno()
187			chmod(fd, mode)
188			return f
189
190			@contextlib.contextmanager
191			def atomic_write(fpath):
192			with atomic_write_(fpath, writer_cls=AtomicWriterPerms, overwrite=True) as f:
193			yield f
194
195
196			def is_file_in_directory(directory, file):
197			"""
198			Return True if ``file`` is in ``directory`` (by checking that all components of ``directory`` are in ``file.parts``)
199			"""
200			directory = Path(directory)
201			file = Path(file)
202			return list(file.parts)[:len(directory.parts)] == list(directory.parts)
203
204			def itertree(path):
205			"""
206			Generate a list of paths by recursively enumerating ``path``
207			"""
208			if not isinstance(path, Path):
209			path = Path(path)
210			if path.is_dir():
211			for subpath in path.iterdir():
212			yield from itertree(subpath)
213			yield path
214
215			def directory_size(path):
216			"""
217			Calculcates size of all files in directory ``path``
218			"""
219			path = Path(path)
220			return sum(f.stat().st_size for f in path.glob('*/') if f.is_file())
221

OCR-D / core

Pull Request — master (#800)

ocrd_utils.os.itertree() A

Complexity

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Duplication

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