get_settings_hash() - Code Metrics - Inspection of "Caching: Compute hash only for enabled sections" - coala-analyzer/coala - Measure and Improve Code Quality continuously with Scrutinizer

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created 2016-09-04 09:50 UTC

get_settings_hash() B

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Ratio	0 %

Importance

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Metric	Value
cc	6
c	0
b	0
f	0
dl	0
loc	22
rs	7.7857

import copy
import hashlib
import os
import pickle

from coalib.misc import Constants


def get_data_path(log_printer, identifier):
    """
    Get the full path of ``identifier`` present in the user's data directory.

    :param log_printer: A LogPrinter object to use for logging.
    :param identifier:  The file whose path needs to be expanded.
    :return:            Full path of the file, assuming it's present in the
                        user's config directory.
                        Returns ``None`` if there is a ``PermissionError``
                        in creating the directory.
    """
    try:
        os.makedirs(Constants.USER_DATA_DIR, exist_ok=True)
        return os.path.join(Constants.USER_DATA_DIR, hash_id(identifier))
    except PermissionError:
        log_printer.err("Unable to create user data directory '{}'. Continuing"
                        " without caching.".format(Constants.USER_DATA_DIR))

    return None


def delete_files(log_printer, identifiers):
    """
    Delete the given identifiers from the user's coala data directory.

    :param log_printer: A LogPrinter object to use for logging.
    :param identifiers: The list of files to be deleted.
    :return:            True if all the given files were successfully deleted.
                        False otherwise.
    """
    error_files = []
    result = True
    for identifier in identifiers:
        try:
            file_path = get_data_path(log_printer, identifier)
            if os.path.isfile(file_path):
                os.remove(file_path)
            else:
                result = False
        except (OSError, TypeError) as e:
            error_files.append(hash_id(identifier))

    if len(error_files) > 0:
        error_files = ", ".join(error_files)
        log_printer.warn("There was a problem deleting the following "
                         "files: {}. Please delete them manually from "
                         "'{}'.".format(error_files, Constants.USER_DATA_DIR))
        result = False

    return result


def pickle_load(log_printer, identifier, fallback=None):
    """
    Get the data stored in ``filename`` present in the user
    config directory. Example usage:

    >>> from pyprint.NullPrinter import NullPrinter
    >>> from coalib.output.printers.LogPrinter import LogPrinter
    >>> log_printer = LogPrinter(NullPrinter())
    >>> test_data = {"answer": 42}
    >>> pickle_dump(log_printer, "test_project", test_data)
    True
    >>> pickle_load(log_printer, "test_project")
    {'answer': 42}
    >>> pickle_load(log_printer, "nonexistent_project")
    >>> pickle_load(log_printer, "nonexistent_project", fallback=42)
    42

    :param log_printer: A LogPrinter object to use for logging.
    :param identifier:  The name of the file present in the user config
                        directory.
    :param fallback:    Return value to fallback to in case the file doesn't
                        exist.
    :return:            Data that is present in the file, if the file exists.
                        Otherwise the ``default`` value is returned.
    """
    file_path = get_data_path(log_printer, identifier)
    if file_path == None or not os.path.isfile(file_path):
        return fallback
    with open(file_path, "rb") as f:
        try:
            return pickle.load(f)
        except (pickle.UnpicklingError, EOFError) as e:
            log_printer.warn("The given file is corrupted and will be "
                             "removed.")
            delete_files(log_printer, [identifier])
            return fallback


def pickle_dump(log_printer, identifier, data):
    """
    Write ``data`` into the file ``filename`` present in the user
    config directory.

    :param log_printer: A LogPrinter object to use for logging.
    :param identifier:  The name of the file present in the user config
                        directory.
    :param data:        Data to be serialized and written to the file using
                        pickle.
    :return:            True if the write was successful.
                        False if there was a permission error in writing.
    """
    file_path = get_data_path(log_printer, identifier)
    if file_path == None:
        # Exit silently since the error has been logged in ``get_data_path``
        return False
    with open(file_path, "wb") as f:
        pickle.dump(data, f)
    return True


def hash_id(text):
    """
    Hashes the given text.

    :param text: String to to be hashed
    :return:     A MD5 hash of the given string
    """
    return hashlib.md5(text.encode("utf-8")).hexdigest()


def get_settings_hash(sections,
                      targets=[],
                      ignore_settings: list=["disable_caching"]):
    """
    Compute and return a unique hash for the settings.

    :param sections:        A dict containing the settings for each section.
    :param targets:         The list of sections that are enabled.
    :param ignore_settings: Setting keys to remove from sections before
                            hashing.
    :return:                A MD5 hash that is unique to the settings used.
    """
    settings = []
    for section in sections:
        if section in targets or targets == []:
            section_copy = copy.deepcopy(sections[section])
            for setting in ignore_settings:
                if setting in section_copy:
                    section_copy.delete_setting(setting)
            settings.append(str(section_copy))

    return hash_id(str(settings))


def settings_changed(log_printer, settings_hash):
    """
    Determine if the settings have changed since the last run with caching.

    :param log_printer:   A LogPrinter object to use for logging.
    :param settings_hash: A MD5 hash that is unique to the settings used.
    :return:              Return True if the settings hash has changed
                          Return False otherwise.
    """
    project_hash = hash_id(os.getcwd())

    settings_hash_db = pickle_load(log_printer, "settings_hash_db", {})
    if project_hash not in settings_hash_db:
        # This is the first time coala is run on this project, so the cache
        # will be flushed automatically.
        return False

    result = settings_hash_db[project_hash] != settings_hash
    if result:
        del settings_hash_db[project_hash]
        log_printer.debug("Since the configuration settings have "
                          "changed since the last run, the "
                          "cache will be flushed and rebuilt.")

    return result


def update_settings_db(log_printer, settings_hash):
    """
    Update the config file last modification date.

    :param log_printer:   A LogPrinter object to use for logging.
    :param settings_hash: A MD5 hash that is unique to the settings used.
    """
    project_hash = hash_id(os.getcwd())

    settings_hash_db = pickle_load(log_printer, "settings_hash_db", {})
    settings_hash_db[project_hash] = settings_hash
    pickle_dump(log_printer, "settings_hash_db", settings_hash_db)


1			import copy
2			import hashlib
3			import os
4			import pickle
5
6			from coalib.misc import Constants
7
8
9			def get_data_path(log_printer, identifier):
10			"""
11			Get the full path of ``identifier`` present in the user's data directory.
12
13			:param log_printer: A LogPrinter object to use for logging.
14			:param identifier: The file whose path needs to be expanded.
15			:return: Full path of the file, assuming it's present in the
16			user's config directory.
17			Returns ``None`` if there is a ``PermissionError``
18			in creating the directory.
19			"""
20			try:
21			os.makedirs(Constants.USER_DATA_DIR, exist_ok=True)
22			return os.path.join(Constants.USER_DATA_DIR, hash_id(identifier))
23			except PermissionError:
24			log_printer.err("Unable to create user data directory '{}'. Continuing"
25			" without caching.".format(Constants.USER_DATA_DIR))
26
27			return None
28
29
30			def delete_files(log_printer, identifiers):
31			"""
32			Delete the given identifiers from the user's coala data directory.
33
34			:param log_printer: A LogPrinter object to use for logging.
35			:param identifiers: The list of files to be deleted.
36			:return: True if all the given files were successfully deleted.
37			False otherwise.
38			"""
39			error_files = []
40			result = True
41			for identifier in identifiers:
42			try:
43			file_path = get_data_path(log_printer, identifier)
44			if os.path.isfile(file_path):
45			os.remove(file_path)
46			else:
47			result = False
48			except (OSError, TypeError) as e:
49			error_files.append(hash_id(identifier))
50
51			if len(error_files) > 0:
52			error_files = ", ".join(error_files)
53			log_printer.warn("There was a problem deleting the following "
54			"files: {}. Please delete them manually from "
55			"'{}'.".format(error_files, Constants.USER_DATA_DIR))
56			result = False
57
58			return result
59
60
61			def pickle_load(log_printer, identifier, fallback=None):
62			"""
63			Get the data stored in ``filename`` present in the user
64			config directory. Example usage:
65
66			>>> from pyprint.NullPrinter import NullPrinter
67			>>> from coalib.output.printers.LogPrinter import LogPrinter
68			>>> log_printer = LogPrinter(NullPrinter())
69			>>> test_data = {"answer": 42}
70			>>> pickle_dump(log_printer, "test_project", test_data)
71			True
72			>>> pickle_load(log_printer, "test_project")
73			{'answer': 42}
74			>>> pickle_load(log_printer, "nonexistent_project")
75			>>> pickle_load(log_printer, "nonexistent_project", fallback=42)
76			42
77
78			:param log_printer: A LogPrinter object to use for logging.
79			:param identifier: The name of the file present in the user config
80			directory.
81			:param fallback: Return value to fallback to in case the file doesn't
82			exist.
83			:return: Data that is present in the file, if the file exists.
84			Otherwise the ``default`` value is returned.
85			"""
86			file_path = get_data_path(log_printer, identifier)
87			if file_path == None or not os.path.isfile(file_path):
88			return fallback
89			with open(file_path, "rb") as f:
90			try:
91			return pickle.load(f)
92			except (pickle.UnpicklingError, EOFError) as e:
93			log_printer.warn("The given file is corrupted and will be "
94			"removed.")
95			delete_files(log_printer, [identifier])
96			return fallback
97
98
99			def pickle_dump(log_printer, identifier, data):
100			"""
101			Write ``data`` into the file ``filename`` present in the user
102			config directory.
103
104			:param log_printer: A LogPrinter object to use for logging.
105			:param identifier: The name of the file present in the user config
106			directory.
107			:param data: Data to be serialized and written to the file using
108			pickle.
109			:return: True if the write was successful.
110			False if there was a permission error in writing.
111			"""
112			file_path = get_data_path(log_printer, identifier)
113			if file_path == None:
114			# Exit silently since the error has been logged in ``get_data_path``
115			return False
116			with open(file_path, "wb") as f:
117			pickle.dump(data, f)
118			return True
119
120
121			def hash_id(text):
122			"""
123			Hashes the given text.
124
125			:param text: String to to be hashed
126			:return: A MD5 hash of the given string
127			"""
128			return hashlib.md5(text.encode("utf-8")).hexdigest()
129
130
131			def get_settings_hash(sections,
132			targets=[],
133			ignore_settings: list=["disable_caching"]):
134			"""
135			Compute and return a unique hash for the settings.
136
137			:param sections: A dict containing the settings for each section.
138			:param targets: The list of sections that are enabled.
139			:param ignore_settings: Setting keys to remove from sections before
140			hashing.
141			:return: A MD5 hash that is unique to the settings used.
142			"""
143			settings = []
144			for section in sections:
145			if section in targets or targets == []:
146			section_copy = copy.deepcopy(sections[section])
147			for setting in ignore_settings:
148			if setting in section_copy:
149			section_copy.delete_setting(setting)
150			settings.append(str(section_copy))
151
152			return hash_id(str(settings))
153
154
155			def settings_changed(log_printer, settings_hash):
156			"""
157			Determine if the settings have changed since the last run with caching.
158
159			:param log_printer: A LogPrinter object to use for logging.
160			:param settings_hash: A MD5 hash that is unique to the settings used.
161			:return: Return True if the settings hash has changed
162			Return False otherwise.
163			"""
164			project_hash = hash_id(os.getcwd())
165
166			settings_hash_db = pickle_load(log_printer, "settings_hash_db", {})
167			if project_hash not in settings_hash_db:
168			# This is the first time coala is run on this project, so the cache
169			# will be flushed automatically.
170			return False
171
172			result = settings_hash_db[project_hash] != settings_hash
173			if result:
174			del settings_hash_db[project_hash]
175			log_printer.debug("Since the configuration settings have "
176			"changed since the last run, the "
177			"cache will be flushed and rebuilt.")
178
179			return result
180
181
182			def update_settings_db(log_printer, settings_hash):
183			"""
184			Update the config file last modification date.
185
186			:param log_printer: A LogPrinter object to use for logging.
187			:param settings_hash: A MD5 hash that is unique to the settings used.
188			"""
189			project_hash = hash_id(os.getcwd())
190
191			settings_hash_db = pickle_load(log_printer, "settings_hash_db", {})
192			settings_hash_db[project_hash] = settings_hash
193			pickle_dump(log_printer, "settings_hash_db", settings_hash_db)
194

coala-analyzer / coala

Push — master ( 7d8a0a...f3765b )

get_settings_hash() B

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