Refactor config module to encapsulate
This commit is contained in:
parent
28c1ef2dd5
commit
ab25d5174a
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@ -1,15 +1,6 @@
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# Standard library imports
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import json
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import logging
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import os
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# Module imports
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from amanuensis.errors import MissingConfigError, MalformedConfigError
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import amanuensis.config.context
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from amanuensis.config.context import is_guid
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import amanuensis.config.init
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import amanuensis.config.loader
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from amanuensis.config.dict import AttrOrderedDict, ReadOnlyOrderedDict
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from amanuensis.config.directory import RootConfigDirectoryContext, is_guid
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# Environment variable name constants
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ENV_SECRET_KEY = "AMANUENSIS_SECRET_KEY"
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@ -18,47 +9,9 @@ ENV_LOG_FILE = "AMANUENSIS_LOG_FILE"
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ENV_LOG_FILE_SIZE = "AMANUENSIS_LOG_FILE_SIZE"
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ENV_LOG_FILE_NUM = "AMANUENSIS_LOG_FILE_NUM"
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#
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# The config directory can be set by cli input, so the config infrastructure
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# needs to wait for initialization before it can load any configs.
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#
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CONFIG_DIR = None
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GLOBAL_CONFIG = None
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logger = None
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root = None
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def init_config(args):
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"""
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Initializes the config infrastructure to read configs from the
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directory given by args.config_dir. Initializes logging.
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"""
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global CONFIG_DIR, GLOBAL_CONFIG, logger, root
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CONFIG_DIR = args.config_dir
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amanuensis.config.init.verify_config_dir(CONFIG_DIR)
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with amanuensis.config.loader.json_ro(
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os.path.join(CONFIG_DIR, "config.json")) as cfg:
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GLOBAL_CONFIG = cfg
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amanuensis.config.init.init_logging(args, GLOBAL_CONFIG['logging'])
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logger = logging.getLogger("amanuensis")
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root = amanuensis.config.context.RootConfigDirectoryContext(CONFIG_DIR)
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def get(key):
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return GLOBAL_CONFIG[key]
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def prepend(*path):
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joined = os.path.join(*path)
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if not joined.startswith(CONFIG_DIR):
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joined = os.path.join(CONFIG_DIR, joined)
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return joined
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def open_sh(*path, **kwargs):
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return amanuensis.config.loader.open_sh(prepend(*path), **kwargs)
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def open_ex(*path, **kwargs):
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return amanuensis.config.loader.open_ex(prepend(*path), **kwargs)
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def json_ro(*path, **kwargs):
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return amanuensis.config.loader.json_ro(prepend(*path), **kwargs)
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def json_rw(*path, **kwargs):
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return amanuensis.config.loader.json_rw(prepend(*path), **kwargs)
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__all__ = [
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AttrOrderedDict.__name__,
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ReadOnlyOrderedDict.__name__,
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RootConfigDirectoryContext.__name__,
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is_guid.__name__,
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]
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@ -1,140 +1,82 @@
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import os
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import re
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"""
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`with` context managers for mediating config file access.
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"""
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# Standard library imports
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import fcntl
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import json
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from amanuensis.config.loader import json_ro, json_rw
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from amanuensis.errors import MissingConfigError, ConfigAlreadyExistsError
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# Application imports
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from amanuensis.config.dict import AttrOrderedDict, ReadOnlyOrderedDict
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def is_guid(s):
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return re.match(r'[0-9a-z]{32}', s.lower())
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class open_lock():
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"""A context manager that opens a file with the specified file lock"""
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def __init__(self, path, mode, lock_type):
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self.fd = open(path, mode, encoding='utf8')
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fcntl.lockf(self.fd, lock_type)
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def __enter__(self):
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return self.fd
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def __exit__(self, exc_type, exc_value, traceback):
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fcntl.lockf(self.fd, fcntl.LOCK_UN)
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self.fd.close()
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class ConfigDirectoryContext():
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class open_sh(open_lock):
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"""A context manager that opens a file with a shared lock"""
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def __init__(self, path, mode):
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super().__init__(path, mode, fcntl.LOCK_SH)
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class open_ex(open_lock):
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"""A context manager that opens a file with an exclusive lock"""
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def __init__(self, path, mode):
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super().__init__(path, mode, fcntl.LOCK_EX)
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class json_ro(open_sh):
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"""
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Base class for CRUD operations on config files in a config
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directory.
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A context manager that opens a file in a shared, read-only mode.
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The contents of the file are read as JSON and returned as a read-
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only OrderedDict.
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"""
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def __init__(self, path):
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self.path = path
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if not os.path.isdir(self.path):
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raise MissingConfigError(path)
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super().__init__(path, 'r')
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self.config = None
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def new(self, filename):
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"""
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Creates a JSON file that doesn't already exist.
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"""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath = os.path.join(self.path, filename)
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if os.path.isfile(fpath):
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raise ConfigAlreadyExistsError(fpath)
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return json_rw(fpath, new=True)
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def read(self, filename):
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"""
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Loads a JSON file in read-only mode.
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"""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath = os.path.join(self.path, filename)
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if not os.path.isfile(fpath):
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raise MissingConfigError(fpath)
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return json_ro(fpath)
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def edit(self, filename, create=False):
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"""
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Loads a JSON file in write mode.
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"""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath = os.path.join(self.path, filename)
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if not create and not os.path.isfile(fpath):
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raise MissingConfigError(fpath)
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return json_rw(fpath, new=create)
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def delete(self, filename):
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"""Deletes a file."""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath = os.path.join(self.path, filename)
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if not os.path.isfile(fpath):
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raise MissingConfigError(fpath)
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os.remove(fpath)
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def ls(self):
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"""Lists all files in this directory."""
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filenames = os.listdir(self.path)
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return filenames
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def __enter__(self) -> ReadOnlyOrderedDict:
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self.config = json.load(self.fd, object_pairs_hook=ReadOnlyOrderedDict)
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return self.config
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class ConfigFileMixin():
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"""Mixin for objects that have config files."""
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def config(self, edit=False):
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"""Context manager for this object's config file."""
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if edit:
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return self.edit('config')
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class json_rw(open_ex):
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"""
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A context manager that opens a file with an exclusive lock. The
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file mode defaults to r+, which requires that the file exist. The
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file mode can be set to w+ to create a new file by setting the new
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kwarg in the ctor. The contents of the file are read as JSON and
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returned in an AttrOrderedDict. Any changes to the context dict
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will be written out to the file when the context manager exits,
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unless an exception is raised before exiting.
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"""
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def __init__(self, path, new=False):
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mode = 'w+' if new else 'r+'
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super().__init__(path, mode)
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self.config = None
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self.new = new
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def __enter__(self) -> AttrOrderedDict:
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if not self.new:
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self.config = json.load(self.fd, object_pairs_hook=AttrOrderedDict)
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else:
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return self.read('config')
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self.config = AttrOrderedDict()
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return self.config
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class IndexDirectoryContext(ConfigDirectoryContext):
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"""
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A lookup layer for getting config directory contexts for lexicon
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or user directories.
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"""
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def __init__(self, path, cdc_type):
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super().__init__(path)
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self.cdc_type = cdc_type
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def __getitem__(self, key):
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"""
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Returns a context to the given item. key is treated as the
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item's id if it's a guid string, otherwise it's treated as
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the item's indexed name and run through the index first.
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"""
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if not is_guid(key):
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with self.index() as index:
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iid = index.get(key)
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if not iid:
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raise MissingConfigError(key)
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key = iid
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return self.cdc_type(os.path.join(self.path, key))
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def index(self, edit=False):
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if edit:
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return self.edit('index')
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else:
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return self.read('index')
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class RootConfigDirectoryContext(ConfigDirectoryContext):
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"""
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Context for the config directory with links to the lexicon and
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user contexts.
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"""
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def __init__(self, path):
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super().__init__(path)
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self.lexicon = IndexDirectoryContext(
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os.path.join(self.path, 'lexicon'),
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LexiconConfigDirectoryContext)
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self.user = IndexDirectoryContext(
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os.path.join(self.path, 'user'),
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UserConfigDirectoryContext)
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class LexiconConfigDirectoryContext(ConfigFileMixin, ConfigDirectoryContext):
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"""
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A config context for a lexicon's config directory.
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"""
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def __init__(self, path):
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super().__init__(path)
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self.draft = ConfigDirectoryContext(os.path.join(self.path, 'draft'))
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self.src = ConfigDirectoryContext(os.path.join(self.path, 'src'))
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self.article = ConfigDirectoryContext(os.path.join(self.path, 'article'))
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class UserConfigDirectoryContext(ConfigFileMixin, ConfigDirectoryContext):
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"""
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A config context for a user's config directory.
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"""
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pass
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def __exit__(self, exc_type, exc_value, traceback):
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# Only write the new value out if there wasn't an exception
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if not exc_type:
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self.fd.seek(0)
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json.dump(self.config, self.fd, allow_nan=False, indent='\t')
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self.fd.truncate()
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super().__exit__(exc_type, exc_value, traceback)
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@ -0,0 +1,52 @@
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"""
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Dictionary classes used to represent JSON config files in memory.
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"""
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from collections import OrderedDict
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from amanuensis.errors import ReadOnlyError
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class AttrOrderedDict(OrderedDict):
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"""
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An OrderedDict with attribute access to known keys and explicit
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creation of new keys.
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"""
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def __getattr__(self, key):
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if key not in self:
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raise AttributeError(key)
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return self[key]
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def __setattr__(self, key, value):
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if key not in self:
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raise AttributeError(key)
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self[key] = value
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def new(self, key, value):
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"""Setter for adding new keys"""
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if key in self:
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raise KeyError("Key already exists: '{}'".format(key))
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self[key] = value
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class ReadOnlyOrderedDict(OrderedDict):
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"""
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An OrderedDict that cannot be modified with attribute access to
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known keys.
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"""
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def __readonly__(self, *args, **kwargs):
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raise ReadOnlyError("Cannot modify a ReadOnlyOrderedDict")
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def __init__(self, *args, **kwargs):
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super(ReadOnlyOrderedDict, self).__init__(*args, **kwargs)
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self.__setitem__ = self.__readonly__
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self.__delitem__ = self.__readonly__
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self.pop = self.__readonly__
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self.popitem = self.__readonly__
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self.clear = self.__readonly__
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self.update = self.__readonly__
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self.setdefault = self.__readonly__
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def __getattr__(self, key):
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if key not in self:
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raise AttributeError(key)
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return self[key]
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@ -0,0 +1,158 @@
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"""
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Config directory abstractions that encapsulate path munging and context
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manager usage.
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"""
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import os
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import re
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from typing import Iterable, Union
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from amanuensis.config.context import json_ro, json_rw
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from amanuensis.errors import MissingConfigError, ConfigAlreadyExistsError
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def is_guid(s: str) -> bool:
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return bool(re.match(r'[0-9a-z]{32}', s.lower()))
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class ConfigDirectoryContext():
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"""
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Base class for CRUD operations on config files in a config
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directory.
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"""
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def __init__(self, path: str):
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self.path: str = path
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if not os.path.isdir(self.path):
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raise MissingConfigError(path)
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def new(self, filename) -> json_rw:
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"""
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Creates a JSON file that doesn't already exist.
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"""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath: str = os.path.join(self.path, filename)
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if os.path.isfile(fpath):
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raise ConfigAlreadyExistsError(fpath)
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return json_rw(fpath, new=True)
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def read(self, filename) -> json_ro:
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"""
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Loads a JSON file in read-only mode.
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"""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath: str = os.path.join(self.path, filename)
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if not os.path.isfile(fpath):
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raise MissingConfigError(fpath)
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return json_ro(fpath)
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def edit(self, filename, create=False) -> json_rw:
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"""
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Loads a JSON file in write mode.
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"""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath: str = os.path.join(self.path, filename)
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if not create and not os.path.isfile(fpath):
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raise MissingConfigError(fpath)
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return json_rw(fpath, new=create)
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def delete(self, filename) -> None:
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"""Deletes a file."""
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if not filename.endswith('.json'):
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filename = f'{filename}.json'
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fpath: str = os.path.join(self.path, filename)
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if not os.path.isfile(fpath):
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raise MissingConfigError(fpath)
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os.remove(fpath)
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def ls(self) -> Iterable[str]:
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"""Lists all files in this directory."""
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filenames: Iterable[str] = os.listdir(self.path)
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return filenames
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class ConfigFileConfigDirectoryContext(ConfigDirectoryContext):
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"""
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Config directory with a `config.json`.
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"""
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def __init__(self, path: str):
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super().__init__(path)
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config_path = os.path.join(self.path, 'config.json')
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if not os.path.isfile(config_path):
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raise MissingConfigError(config_path)
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def config(self, edit: bool = False) -> Union[json_ro, json_rw]:
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"""Context manager for this object's config file."""
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if edit:
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return self.edit('config')
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else:
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return self.read('config')
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class IndexDirectoryContext(ConfigDirectoryContext):
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"""
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A lookup layer for getting config directory contexts for lexicon
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or user directories.
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"""
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def __init__(self, path: str, cdc_type: type):
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super().__init__(path)
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index_path = os.path.join(self.path, 'index.json')
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if not os.path.isfile(index_path):
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raise MissingConfigError(index_path)
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self.cdc_type = cdc_type
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def __getitem__(self, key: str):
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"""
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Returns a context to the given item. key is treated as the
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item's id if it's a guid string, otherwise it's treated as
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the item's indexed name and run through the index first.
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"""
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if not is_guid(key):
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with self.index() as index:
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iid = index.get(key)
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if not iid:
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raise MissingConfigError(key)
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key = iid
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return self.cdc_type(os.path.join(self.path, key))
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def index(self, edit=False) -> Union[json_ro, json_rw]:
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if edit:
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return self.edit('index')
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else:
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return self.read('index')
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class RootConfigDirectoryContext(ConfigDirectoryContext):
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"""
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Context for the config directory with links to the lexicon and
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user contexts.
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"""
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def __init__(self, path):
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super().__init__(path)
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self.lexicon: IndexDirectoryContext = IndexDirectoryContext(
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os.path.join(self.path, 'lexicon'),
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LexiconConfigDirectoryContext)
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self.user: IndexDirectoryContext = IndexDirectoryContext(
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os.path.join(self.path, 'user'),
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UserConfigDirectoryContext)
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class LexiconConfigDirectoryContext(ConfigFileConfigDirectoryContext):
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"""
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A config context for a lexicon's config directory.
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"""
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def __init__(self, path):
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super().__init__(path)
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self.draft: ConfigDirectoryContext = ConfigDirectoryContext(
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os.path.join(self.path, 'draft'))
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self.src: ConfigDirectoryContext = ConfigDirectoryContext(
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os.path.join(self.path, 'src'))
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self.article: ConfigDirectoryContext = ConfigDirectoryContext(
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os.path.join(self.path, 'article'))
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class UserConfigDirectoryContext(ConfigFileConfigDirectoryContext):
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"""
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A config context for a user's config directory.
|
||||
"""
|
||||
|
|
@ -1,119 +0,0 @@
|
|||
# Standard library imports
|
||||
from collections import OrderedDict
|
||||
import fcntl
|
||||
import json
|
||||
|
||||
# Module imports
|
||||
from amanuensis.errors import ReadOnlyError
|
||||
|
||||
|
||||
class AttrOrderedDict(OrderedDict):
|
||||
"""An ordered dictionary with access via __getattr__"""
|
||||
def __getattr__(self, key):
|
||||
if key not in self:
|
||||
raise AttributeError(key)
|
||||
return self[key]
|
||||
|
||||
def __setattr__(self, key, value):
|
||||
if key not in self:
|
||||
raise AttributeError(key)
|
||||
self[key] = value
|
||||
|
||||
def new(self, key, value):
|
||||
"""Setter for adding new keys"""
|
||||
if key in self:
|
||||
raise KeyError("Key already exists: '{}'".format(key))
|
||||
self[key] = value
|
||||
|
||||
|
||||
class ReadOnlyOrderedDict(OrderedDict):
|
||||
"""An ordered dictionary that cannot be modified"""
|
||||
def __readonly__(self, *args, **kwargs):
|
||||
raise ReadOnlyError("Cannot modify a ReadOnlyOrderedDict")
|
||||
|
||||
def __init__(self, *args, **kwargs):
|
||||
super(ReadOnlyOrderedDict, self).__init__(*args, **kwargs)
|
||||
self.__setitem__ = self.__readonly__
|
||||
self.__delitem__ = self.__readonly__
|
||||
self.pop = self.__readonly__
|
||||
self.popitem = self.__readonly__
|
||||
self.clear = self.__readonly__
|
||||
self.update = self.__readonly__
|
||||
self.setdefault = self.__readonly__
|
||||
|
||||
def __getattr__(self, key):
|
||||
if key not in self:
|
||||
raise AttributeError(key)
|
||||
return self[key]
|
||||
|
||||
|
||||
class open_lock():
|
||||
"""A context manager that opens a file with the specified file lock"""
|
||||
def __init__(self, path, mode, lock_type):
|
||||
self.fd = open(path, mode, encoding='utf8')
|
||||
fcntl.lockf(self.fd, lock_type)
|
||||
|
||||
def __enter__(self):
|
||||
return self.fd
|
||||
|
||||
def __exit__(self, exc_type, exc_value, traceback):
|
||||
fcntl.lockf(self.fd, fcntl.LOCK_UN)
|
||||
self.fd.close()
|
||||
|
||||
|
||||
class open_sh(open_lock):
|
||||
"""A context manager that opens a file with a shared lock"""
|
||||
def __init__(self, path, mode):
|
||||
super().__init__(path, mode, fcntl.LOCK_SH)
|
||||
|
||||
|
||||
class open_ex(open_lock):
|
||||
"""A context manager that opens a file with an exclusive lock"""
|
||||
def __init__(self, path, mode):
|
||||
super().__init__(path, mode, fcntl.LOCK_EX)
|
||||
|
||||
|
||||
class json_ro(open_sh):
|
||||
"""
|
||||
A context manager that opens a file in a shared, read-only mode.
|
||||
The contents of the file are read as JSON and returned as a read-
|
||||
only OrderedDict.
|
||||
"""
|
||||
def __init__(self, path):
|
||||
super().__init__(path, 'r')
|
||||
self.config = None
|
||||
|
||||
def __enter__(self):
|
||||
self.config = json.load(self.fd, object_pairs_hook=ReadOnlyOrderedDict)
|
||||
return self.config
|
||||
|
||||
|
||||
class json_rw(open_ex):
|
||||
"""
|
||||
A context manager that opens a file with an exclusive lock. The
|
||||
file mode defaults to r+, which requires that the file exist. The
|
||||
file mode can be set to w+ to create a new file by setting the new
|
||||
kwarg in the ctor. The contents of the file are read as JSON and
|
||||
returned in an AttrOrderedDict. Any changes to the context dict
|
||||
will be written out to the file when the context manager exits.
|
||||
"""
|
||||
def __init__(self, path, new=False):
|
||||
mode = 'w+' if new else 'r+'
|
||||
super().__init__(path, mode)
|
||||
self.config = None
|
||||
self.new = new
|
||||
|
||||
def __enter__(self):
|
||||
if not self.new:
|
||||
self.config = json.load(self.fd, object_pairs_hook=AttrOrderedDict)
|
||||
else:
|
||||
self.config = AttrOrderedDict()
|
||||
return self.config
|
||||
|
||||
def __exit__(self, exc_type, exc_value, traceback):
|
||||
# Only write the new value out if there wasn't an exception
|
||||
if not exc_type:
|
||||
self.fd.seek(0)
|
||||
json.dump(self.config, self.fd, allow_nan=False, indent='\t')
|
||||
self.fd.truncate()
|
||||
super().__exit__(exc_type, exc_value, traceback)
|
||||
Loading…
Reference in New Issue