def topic_context(topic):
"""
Given a topic node, create all context related to showing that topic
in a template.
"""
videos = topic_tools.get_videos(topic)
exercises = topic_tools.get_exercises(topic)
topics = topic_tools.get_live_topics(topic)
my_topics = [dict((k, t[k]) for k in ('title', 'path', 'nvideos_local', 'nvideos_known', 'nvideos_available')) for t in topics]
exercises_path = os.path.join(settings.STATIC_ROOT, "js", "khan-exercises", "exercises")
exercise_langs = dict([(exercise["id"], ["en"]) for exercise in exercises])
for lang_code in (set(os.listdir(exercises_path)) - set(["test"])): # hard-code out test
loc_path = os.path.join(exercises_path, lang_code)
if not os.path.isdir(loc_path):
continue
for exercise in exercises:
ex_path = os.path.join(loc_path, "%s.html" % exercise["id"])
if not os.path.exists(ex_path):
continue
exercise_langs[exercise["id"]].append(lang_code)
context = {
"topic": topic,
"title": topic["title"],
"description": re.sub(r'<[^>]*?>', '', topic["description"] or ""),
"videos": videos,
"exercises": exercises,
"exercise_langs": exercise_langs,
"topics": my_topics,
}
return context
def stamp_availability_on_topic(topic, videos_path=settings.CONTENT_ROOT, force=True, stamp_urls=True, update_counts_question_mark= None):
""" Uses the (json) topic tree to query the django database for which video files exist
Returns the original topic dictionary, with two properties added to each NON-LEAF node:
* nvideos_known: The # of videos in and under that node, that are known (i.e. in the Khan Academy library)
* nvideos_local: The # of vidoes in and under that node, that were actually downloaded and available locally
And the following property for leaf nodes:
* on_disk
Input Parameters:
* videos_path: the path to video files
"""
if update_counts_question_mark is None:
update_counts_question_mark = do_video_counts_need_update_question_mark()
if not force and "nvideos_local" in topic:
return (topic, topic["nvideos_local"], topic["nvideos_known"], False)
nvideos_local = 0
nvideos_known = 0
# Can't deal with leaves
assert topic["kind"] == "Topic", "Should not be calling this function on leaves; it's inefficient!"
# Only look for videos if there are more branches
if len(topic["children"]) == 0:
logging.debug("no children: %s" % topic["path"])
for child in topic["children"]:
# RECURSIVE CALL:
# The children have children, let them figure things out themselves
if "children" in child:
if not force and "nvideos_local" in child:
continue
stamp_availability_on_topic(topic=child, videos_path=videos_path, force=force, stamp_urls=stamp_urls, update_counts_question_mark=update_counts_question_mark)
nvideos_local += child["nvideos_local"]
nvideos_known += child["nvideos_known"]
# BASE CASE:
# All my children are leaves, so we'll query here (a bit more efficient than 1 query per leaf)
videos = get_videos(topic)
for video in videos:
if force or update_counts_question_mark or "availability" not in video:
stamp_availability_on_video(video, force=force, stamp_urls=stamp_urls, videos_path=videos_path)
nvideos_local += int(video["on_disk"])
nvideos_known += len(videos)
nvideos_available = nvideos_local if not settings.BACKUP_VIDEO_SOURCE else nvideos_known
changed = "nvideos_local" in topic and topic["nvideos_local"] != nvideos_local
changed = changed or ("nvideos_known" in topic and topic["nvideos_known"] != nvideos_known)
topic["nvideos_local"] = nvideos_local
topic["nvideos_known"] = nvideos_known
topic["nvideos_available"] = nvideos_available
topic["available"] = bool(nvideos_local) or bool(settings.BACKUP_VIDEO_SOURCE)
return (topic, nvideos_local, nvideos_known, nvideos_available, changed)
def stamp_availability_on_topic(topic,
videos_path=settings.CONTENT_ROOT,
force=True,
stamp_urls=True,
update_counts_question_mark=None):
""" Uses the (json) topic tree to query the django database for which video files exist
Returns the original topic dictionary, with two properties added to each NON-LEAF node:
* nvideos_known: The # of videos in and under that node, that are known (i.e. in the Khan Academy library)
* nvideos_local: The # of vidoes in and under that node, that were actually downloaded and available locally
And the following property for leaf nodes:
* on_disk
Input Parameters:
* videos_path: the path to video files
"""
if update_counts_question_mark is None:
update_counts_question_mark = do_video_counts_need_update_question_mark(
)
if not force and "nvideos_local" in topic:
return (topic, topic["nvideos_local"], topic["nvideos_known"], False)
nvideos_local = 0
nvideos_known = 0
# Can't deal with leaves
assert topic[
"kind"] == "Topic", "Should not be calling this function on leaves; it's inefficient!"
# Only look for videos if there are more branches
if len(topic["children"]) == 0:
logging.debug("no children: %s" % topic["path"])
for child in topic["children"]:
# RECURSIVE CALL:
# The children have children, let them figure things out themselves
if "children" in child:
if not force and "nvideos_local" in child:
continue
stamp_availability_on_topic(
topic=child,
videos_path=videos_path,
force=force,
stamp_urls=stamp_urls,
update_counts_question_mark=update_counts_question_mark)
nvideos_local += child["nvideos_local"]
nvideos_known += child["nvideos_known"]
# BASE CASE:
# All my children are leaves, so we'll query here (a bit more efficient than 1 query per leaf)
videos = get_videos(topic)
for video in videos:
if force or update_counts_question_mark or "availability" not in video:
stamp_availability_on_video(video,
force=force,
stamp_urls=stamp_urls,
videos_path=videos_path)
nvideos_local += int(video["on_disk"])
nvideos_known += len(videos)
nvideos_available = nvideos_local if not settings.BACKUP_VIDEO_SOURCE else nvideos_known
changed = "nvideos_local" in topic and topic[
"nvideos_local"] != nvideos_local
changed = changed or ("nvideos_known" in topic
and topic["nvideos_known"] != nvideos_known)
topic["nvideos_local"] = nvideos_local
topic["nvideos_known"] = nvideos_known
topic["nvideos_available"] = nvideos_available
topic["available"] = bool(nvideos_local) or bool(
settings.BACKUP_VIDEO_SOURCE)
return (topic, nvideos_local, nvideos_known, nvideos_available, changed)
