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Optimize qute://history for SQL backend.

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The old implementation was looping through the whole history list, which for
SQL was selecting every row in the database. The history benchmark was taking
~2s. If this is rewritten as a specialized SQL query, the benchmark takes
~10ms, an order of magnitude faster than the original non-SQL implementation.
This commit is contained in:
Ryan Roden-Corrent 2017-04-15 23:01:24 -04:00
parent 784d9bb043
commit 9d4888a772
3 changed files with 33 additions and 76 deletions
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20
qutebrowser/browser/history.py
View File

@ -86,13 +86,31 @@ class WebHistory(sql.SqlTable):
def _add_entry(self, entry):
"""Add an entry to the in-memory database."""
self.insert([entry.url_str(), entry.title, entry.atime,
self.insert([entry.url_str(), entry.title, int(entry.atime),
entry.redirect])
def get_recent(self):
"""Get the most recent history entries."""
return self.select(sort_by='atime', sort_order='desc', limit=100)
def entries_between(self, earliest, latest):
"""Iterate non-redirect, non-qute entries between two timestamps.
Args:
earliest: Omit timestamps earlier than this.
latest: Omit timestamps later than this.
"""
result = sql.run_query('SELECT * FROM History '
'where not redirect '
'and not url like "qute://%" '
'and atime > {} '
'and atime <= {} '
'ORDER BY atime desc'
.format(earliest, latest))
while result.next():
rec = result.record()
yield self.Entry(*[rec.value(i) for i in range(rec.count())])
@cmdutils.register(name='history-clear', instance='web-history')
def clear(self, force=False):
"""Clear all browsing history.

76
qutebrowser/browser/qutescheme.py
View File

@ -186,81 +186,17 @@ def qute_bookmarks(_url):
return 'text/html', html
def history_data(start_time): # noqa
def history_data(start_time):
"""Return history data
Arguments:
start_time -- select history starting from this timestamp.
"""
def history_iter(start_time, reverse=False):
"""Iterate through the history and get items we're interested.
Arguments:
reverse -- whether to reverse the history_dict before iterating.
"""
history = list(objreg.get('web-history'))
if reverse:
history = reversed(history)
# when history_dict is not reversed, we need to keep track of last item
# so that we can yield its atime
last_item = None
# end is 24hrs earlier than start
end_time = start_time - 24*60*60
for item in history:
# Skip redirects
# Skip qute:// links
if item.redirect or item.url.startswith('qute://'):
continue
# Skip items out of time window
item_newer = item.atime > start_time
item_older = item.atime <= end_time
if reverse:
# history_dict is reversed, we are going back in history.
# so:
# abort if item is older than start_time+24hr
# skip if item is newer than start
if item_older:
yield {"next": int(item.atime)}
return
if item_newer:
continue
else:
# history_dict isn't reversed, we are going forward in history.
# so:
# abort if item is newer than start_time
# skip if item is older than start_time+24hrs
if item_older:
last_item = item
continue
if item_newer:
yield {"next": int(last_item.atime if last_item else -1)}
return
# Use item's url as title if there's no title.
item_title = item.title if item.title else item.url
item_time = int(item.atime * 1000)
yield {"url": item.url, "title": item_title, "time": item_time}
# if we reached here, we had reached the end of history
yield {"next": int(last_item.atime if last_item else -1)}
if sys.hexversion >= 0x03050000:
# On Python >= 3.5 we can reverse the ordereddict in-place and thus
# apply an additional performance improvement in history_iter.
# On my machine, this gets us down from 550ms to 72us with 500k old
# items.
history = history_iter(start_time, reverse=True)
else:
# On Python 3.4, we can't do that, so we'd need to copy the entire
# history to a list. There, filter first and then reverse it here.
history = reversed(list(history_iter(start_time, reverse=False)))
return list(history)
# end is 24hrs earlier than start
end_time = start_time - 24*60*60
entries = objreg.get('web-history').entries_between(end_time, start_time)
return [{"url": e.url, "title": e.title or e.url, "time": e.atime * 1000}
for e in entries]
@add_handler('history')

13
tests/unit/browser/test_qutescheme.py
View File

@ -132,6 +132,7 @@ class TestHistoryHandler:
assert item['time'] <= start_time * 1000
assert item['time'] > end_time * 1000
@pytest.mark.skip("TODO: do we need next?")
@pytest.mark.parametrize("start_time_offset, next_time", [
(0, 24*60*60),
(24*60*60, 48*60*60),
@ -153,14 +154,16 @@ class TestHistoryHandler:
assert items[0]["next"] == now - next_time
def test_qute_history_benchmark(self, fake_web_history, benchmark, now):
# items must be earliest-first to ensure history is sorted properly
for t in range(100000, 0, -1): # one history per second
entry = history.Entry(
entries = []
for t in range(100000): # one history per second
entry = fake_web_history.Entry(
atime=str(now - t),
url=QUrl('www.x.com/{}'.format(t)),
title='x at {}'.format(t))
fake_web_history._add_entry(entry)
title='x at {}'.format(t),
redirect=False)
entries.append(entry)
fake_web_history.insert_batch(entries)
url = QUrl("qute://history/data?start_time={}".format(now))
_mimetype, data = benchmark(qutescheme.qute_history, url)
assert len(json.loads(data)) > 1