X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/cc9a57b827d7303c37f3b2d271e7c2f661d30e45..dfd584e3b136d770bf56569030d10712a8722569:/apps/catalogue/utils.py diff --git a/apps/catalogue/utils.py b/apps/catalogue/utils.py index 9de4eaa2d..df7e438e4 100644 --- a/apps/catalogue/utils.py +++ b/apps/catalogue/utils.py @@ -4,6 +4,7 @@ # from __future__ import with_statement +import hashlib import random import re import time @@ -13,7 +14,7 @@ from django.http import HttpResponse from django.core.files.uploadedfile import UploadedFile from django.core.files.storage import DefaultStorage from django.utils.encoding import force_unicode -from django.utils.hashcompat import sha_constructor +from django.utils.translation import get_language from django.conf import settings from os import mkdir, path, unlink from errno import EEXIST, ENOENT @@ -31,14 +32,18 @@ MAX_SESSION_KEY = 18446744073709551616L # 2 << 63 def get_random_hash(seed): - sha_digest = sha_constructor('%s%s%s%s' % + sha_digest = hashlib.sha1('%s%s%s%s' % (randrange(0, MAX_SESSION_KEY), time.time(), unicode(seed).encode('utf-8', 'replace'), settings.SECRET_KEY)).digest() return urlsafe_b64encode(sha_digest).replace('=', '').replace('_', '-').lower() -def split_tags(tags): - result = {} +def split_tags(tags, initial=None): + if initial is None: + result = {} + else: + result = initial + for tag in tags: result.setdefault(tag.category, []).append(tag) return result @@ -74,7 +79,7 @@ class LockFile(object): try: unlink(self.lockname) except OSError as oe: - if oe.errno != oe.EEXIST: + if oe.errno != EEXIST: raise oe self.lock.close() @@ -125,7 +130,7 @@ def remove_zip(zip_slug): class AttachmentHttpResponse(HttpResponse): """Response serving a file to be downloaded. """ - def __init__ (self, file_path, file_name, mimetype): + def __init__(self, file_path, file_name, mimetype): super(AttachmentHttpResponse, self).__init__(mimetype=mimetype) self['Content-Disposition'] = 'attachment; filename=%s' % file_name self.file_path = file_path @@ -139,15 +144,15 @@ class MultiQuerySet(object): def __init__(self, *args, **kwargs): self.querysets = args self._count = None - + def count(self): if not self._count: self._count = sum(len(qs) for qs in self.querysets) return self._count - + def __len__(self): return self.count() - + def __getitem__(self, item): try: indices = (offset, stop, step) = item.indices(self.count()) @@ -168,6 +173,55 @@ class MultiQuerySet(object): stop = total_len - len(items) continue +class SortedMultiQuerySet(MultiQuerySet): + def __init__(self, *args, **kwargs): + self.order_by = kwargs.pop('order_by', None) + self.sortfn = kwargs.pop('sortfn', None) + if self.order_by is not None: + self.sortfn = lambda a, b: cmp((getattr(a, f) for f in self.order_by), + (getattr(b, f) for f in self.order_by)) + super(SortedMultiQuerySet, self).__init__(*args, **kwargs) + + def __getitem__(self, item): + sort_heads = [0] * len(self.querysets) + try: + indices = (offset, stop, step) = item.indices(self.count()) + except AttributeError: + # it's not a slice - make it one + return self[item : item + 1][0] + items = [] + total_len = stop - offset + skipped = 0 + i_s = range(len(sort_heads)) + + while len(items) < total_len: + candidate = None + candidate_i = None + for i in i_s: + def get_next(): + return self.querysets[i][sort_heads[i]] + try: + if candidate is None: + candidate = get_next() + candidate_i = i + else: + competitor = get_next() + if self.sortfn(candidate, competitor) > 0: + candidate = competitor + candidate_i = i + except IndexError: + continue # continue next sort_head + # we have no more elements: + if candidate is None: + break + sort_heads[candidate_i] += 1 + if skipped < offset: + skipped += 1 + continue # continue next item + items.append(candidate) + + return items + def truncate_html_words(s, num, end_text='...'): """Truncates HTML to a certain number of words (not counting tags and @@ -257,3 +311,43 @@ def clear_custom_pdf(book): """ from waiter.utils import clear_cache clear_cache('book/%s' % book.slug) + + +class AppSettings(object): + """Allows specyfying custom settings for an app, with default values. + + Just subclass, set some properties and instantiate with a prefix. + Getting a SETTING from an instance will check for prefix_SETTING + in project settings if set, else take the default. The value will be + then filtered through _more_SETTING method, if there is one. + + """ + def __init__(self, prefix): + self._prefix = prefix + + def __getattribute__(self, name): + if name.startswith('_'): + return object.__getattribute__(self, name) + value = getattr(settings, + "%s_%s" % (self._prefix, name), + object.__getattribute__(self, name)) + more = "_more_%s" % name + if hasattr(self, more): + value = getattr(self, more)(value) + return value + + +def trim_query_log(trim_to=25): + """ +connection.queries includes all SQL statements -- INSERTs, UPDATES, SELECTs, etc. Each time your app hits the database, the query will be recorded. +This can sometimes occupy lots of memory, so trim it here a bit. + """ + if settings.DEBUG: + from django.db import connection + connection.queries = trim_to > 0 \ + and connection.queries[-trim_to:] \ + or [] + + +def delete_from_cache_by_language(cache, key_template): + cache.delete_many([key_template % lc for lc, ln in settings.LANGUAGES])