image listings / boxes work but need polishing. started coding the viewer.

[wolnelektury.git] / apps / catalogue / utils.py

diff --git a/apps/catalogue/utils.py b/apps/catalogue/utils.py
index 185f5fa..5ae9db5 100644 (file)
--- a/apps/catalogue/utils.py
+++ b/apps/catalogue/utils.py
@@ -4,28 +4,23 @@
 #
 from __future__ import with_statement
 
 #
 from __future__ import with_statement
 

+import hashlib

 import random
 import re
 import time
 from base64 import urlsafe_b64encode
 
 import random
 import re
 import time
 from base64 import urlsafe_b64encode
 

-from django.http import HttpResponse, HttpResponseRedirect, Http404, HttpResponsePermanentRedirect
+from django.http import HttpResponse

 from django.core.files.uploadedfile import UploadedFile
 from django.core.files.uploadedfile import UploadedFile

-from django.core.files.base import File

 from django.core.files.storage import DefaultStorage
 from django.utils.encoding import force_unicode
 from django.core.files.storage import DefaultStorage
 from django.utils.encoding import force_unicode

-from django.utils.hashcompat import sha_constructor

 from django.conf import settings
 from django.conf import settings

-from celery.task import task

 from os import mkdir, path, unlink
 from errno import EEXIST, ENOENT
 from fcntl import flock, LOCK_EX
 from zipfile import ZipFile
 from os import mkdir, path, unlink
 from errno import EEXIST, ENOENT
 from fcntl import flock, LOCK_EX
 from zipfile import ZipFile

-from traceback import print_exc

 
 from reporting.utils import read_chunks
 
 from reporting.utils import read_chunks

-from celery.task import task
-import catalogue.models

 
 # Use the system (hardware-based) random number generator if it exists.
 if hasattr(random, 'SystemRandom'):
 
 # Use the system (hardware-based) random number generator if it exists.
 if hasattr(random, 'SystemRandom'):


@@ -36,7 +31,7 @@ MAX_SESSION_KEY = 18446744073709551616L     # 2 << 63
 
 
 def get_random_hash(seed):
 
 
 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()
         (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()


@@ -49,6 +44,25 @@ def split_tags(tags):
     return result
 
 
     return result
 
 

+def get_dynamic_path(media, filename, ext=None, maxlen=100):
+    from fnpdjango.utils.text.slughifi import slughifi
+
+    # how to put related book's slug here?
+    if not ext:
+        # BookMedia case
+        ext = media.formats[media.type].ext
+    if media is None or not media.name:
+        name = slughifi(filename.split(".")[0])
+    else:
+        name = slughifi(media.name)
+    return 'book/%s/%s.%s' % (ext, name[:maxlen-len('book/%s/.%s' % (ext, ext))-4], ext)
+
+
+# TODO: why is this hard-coded ?
+def book_upload_path(ext=None, maxlen=100):
+    return lambda *args: get_dynamic_path(*args, ext=ext, maxlen=maxlen)
+
+

 class ExistingFile(UploadedFile):
 
     def __init__(self, path, *args, **kwargs):
 class ExistingFile(UploadedFile):
 
     def __init__(self, path, *args, **kwargs):


@@ -79,12 +93,12 @@ class LockFile(object):
         try:
             unlink(self.lockname)
         except OSError as oe:
         try:
             unlink(self.lockname)
         except OSError as oe:

-            if oe.errno != oe.EEXIST:
+            if oe.errno != EEXIST:

                 raise oe
         self.lock.close()
 
 
                 raise oe
         self.lock.close()
 
 

-@task
+#@task

 def create_zip(paths, zip_slug):
     """
     Creates a zip in MEDIA_ROOT/zip directory containing files from path.
 def create_zip(paths, zip_slug):
     """
     Creates a zip in MEDIA_ROOT/zip directory containing files from path.


@@ -140,25 +154,6 @@ class AttachmentHttpResponse(HttpResponse):
             for chunk in read_chunks(f):
                 self.write(chunk)
 
             for chunk in read_chunks(f):
                 self.write(chunk)
 

-@task
-def async_build_pdf(book_id, customizations, file_name):
-    """
-    A celery task to generate pdf files.
-    Accepts the same args as Book.build_pdf, but with book id as first parameter
-    instead of Book instance
-    """
-    try:
-        book = catalogue.models.Book.objects.get(id=book_id)
-        print "will gen %s" % DefaultStorage().path(file_name)
-        if not DefaultStorage().exists(file_name):
-            book.build_pdf(customizations=customizations, file_name=file_name)
-        print "done."
-    except Exception, e:
-        print "Error during pdf creation: %s" % e
-        print_exc
-        raise e
-
-

 class MultiQuerySet(object):
     def __init__(self, *args, **kwargs):
         self.querysets = args
 class MultiQuerySet(object):
     def __init__(self, *args, **kwargs):
         self.querysets = args


@@ -260,3 +255,61 @@ def truncate_html_words(s, num, end_text='...'):
         out += '</%s>' % tag
     # Return string
     return out
         out += '</%s>' % tag
     # Return string
     return out

+
+
+def customizations_hash(customizations):
+    customizations.sort()
+    return hash(tuple(customizations))
+
+
+def get_customized_pdf_path(book, customizations):
+    """
+    Returns a MEDIA_ROOT relative path for a customized pdf. The name will contain a hash of customization options.
+    """
+    h = customizations_hash(customizations)
+    return 'book/%s/%s-custom-%s.pdf' % (book.slug, book.slug, h)
+
+
+def clear_custom_pdf(book):
+    """
+    Returns a list of paths to generated customized pdf of a 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 []
+