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from pathlib import Path |
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import re |
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from shutil import copyfileobj, copytree |
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from tempfile import TemporaryFile |
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from tarfile import open as open_tarfile |
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import requests |
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from yaml import safe_load |
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from .constants import RESOURCE_LIST_FILENAME |
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from ocrd_validators import OcrdResourceListValidator |
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from ocrd_utils import getLogger |
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from ocrd_utils.constants import HOME, XDG_CACHE_HOME |
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from ocrd_utils.os import list_resource_candidates, list_all_resources, pushd_popd |
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builtin_list_filename = Path(RESOURCE_LIST_FILENAME) |
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user_list_filename = Path(HOME, 'ocrd', 'resources.yml') |
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class OcrdResourceManager(): |
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""" |
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Managing processor resources |
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""" |
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def __init__(self): |
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self.log = getLogger('ocrd.resource_manager') |
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self.database = {} |
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self.load_resource_list(builtin_list_filename) |
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self.load_resource_list(user_list_filename) |
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def load_resource_list(self, list_filename): |
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if list_filename.is_file(): |
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with open(list_filename, 'r', encoding='utf-8') as f: |
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list_loaded = safe_load(f) |
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report = OcrdResourceListValidator.validate(list_loaded) |
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if not report.is_valid: |
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self.log.error('\n'.join(report.errors)) |
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raise ValueError("Resource list %s is invalid!" % (list_filename)) |
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for executable, resource_list in list_loaded.items(): |
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if executable not in self.database: |
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self.database[executable] = [] |
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# Prepend, so user provided is sorted before builtin |
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self.database[executable] = list_loaded[executable] + self.database[executable] |
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def list_available(self, executable=None): |
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""" |
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List models available for download by processor |
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""" |
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if executable: |
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return [(executable, self.database[executable])] |
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return [(x, y) for x, y in self.database.items()] |
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def list_installed(self, executable=None): |
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""" |
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List installed resources, matching with registry by ``name`` |
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""" |
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ret = [] |
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for executable in [executable] if executable else self.database.keys(): |
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reslist = [] |
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for res_filename in list_all_resources(executable): |
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res_name = Path(res_filename).name |
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resdict = [x for x in self.database[executable] if x['name'] == res_name] |
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if not resdict: |
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# TODO handle gracefully |
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resdict = [{'name': res_name, 'url': '???', 'description': '???', 'version_range': '???'}] |
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reslist.append(resdict[0]) |
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ret.append((executable, reslist)) |
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return ret |
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def find_resources(self, executable=None, name=None, url=None): |
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""" |
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Find resources in the registry |
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""" |
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ret = [] |
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if executable and executable not in self.database.keys(): |
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return ret |
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for executable in [executable] if executable else self.database.keys(): |
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for resdict in self.database[executable]: |
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if url and url == resdict['url']: |
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ret.append((executable, resdict)) |
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elif name and name == resdict['name']: |
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ret.append((executable, resdict)) |
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return ret |
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def parameter_usage(self, name, usage='as-is'): |
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if usage == 'as-is': |
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return name |
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if usage == 'without-extension': |
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return Path(name).stem |
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def _download_impl(self, url, filename, progress_cb=None): |
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with open(filename, 'wb') as f: |
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with requests.get(url, stream=True) as r: |
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total = int(r.headers.get('content-length')) |
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# copyfileobj(r.raw, f_write_tar) |
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for data in r.iter_content(chunk_size=4096): |
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if progress_cb: |
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progress_cb(len(data)) |
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f.write(data) |
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# TODO Proper caching (make head request for size, If-Modified etc) |
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def download( |
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self, |
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executable, |
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url, |
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overwrite=False, |
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basedir=XDG_CACHE_HOME, |
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name=None, |
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resource_type='file', |
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path_in_archive='.', |
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progress_cb=None, |
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): |
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""" |
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Download a resource by URL |
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""" |
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log = getLogger('ocrd.resource_manager.download') |
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destdir = Path(basedir, executable) |
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if not name: |
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name = re.sub('[^A-Za-z0-9]', '', url) |
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fpath = Path(destdir, name) |
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if fpath.exists() and not overwrite: |
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log.info("%s to be downloaded to %s which already exists and overwrite is False" % (url, fpath)) |
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return fpath |
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destdir.mkdir(parents=True, exist_ok=True) |
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if resource_type == 'file': |
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self._download_impl(url, fpath, progress_cb) |
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elif resource_type == 'tarball': |
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with pushd_popd(tempdir=True): |
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log.info("Downloading %s" % url) |
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self._download_impl(url, 'download.tar.xx', progress_cb) |
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Path('out').mkdir() |
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with pushd_popd('out'): |
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log.info("Extracting tarball") |
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with open_tarfile('../download.tar.xx', 'r:*') as tar: |
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tar.extractall() |
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log.info("Copying '%s' from tarball to %s" % (path_in_archive, fpath)) |
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copytree(path_in_archive, str(fpath)) |
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# TODO |
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# elif resource_type == 'github-dir': |
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return fpath |
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OCR-D /
core
