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cached a change, it's good forever.
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from loggerhead import util
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from loggerhead.util import decorator
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from loggerhead.lockfile import LockFile
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with_lock = util.with_lock('_lock', 'ChangeCache')
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SQLITE_INTERFACE = os.environ.get('SQLITE_INTERFACE', 'sqlite')
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if SQLITE_INTERFACE == 'pysqlite2':
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from pysqlite2 import dbapi2
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elif SQLITE_INTERFACE == 'sqlite':
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import sqlite as dbapi2
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_select_stmt = ("select data from revisiondata where revid = ?"
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).replace('?', _param_marker)
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_insert_stmt = ("insert into revisiondata (revid, data) "
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"values (?, ?)").replace('?', _param_marker)
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class FakeShelf(object):
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def __init__(self, filename):
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create_table = not os.path.exists(filename)
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self.connection = dbapi2.connect(filename)
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self.cursor = self.connection.cursor()
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def _create_table(self):
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"create table RevisionData "
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"(revid binary primary key, data binary)")
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self.connection.commit()
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def _serialize(self, obj):
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r = dbapi2.Binary(cPickle.dumps(obj, protocol=2))
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def _unserialize(self, data):
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return cPickle.loads(str(data))
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self.cursor.execute(_select_stmt, (revid,))
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filechange = self.cursor.fetchone()
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if filechange is None:
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return self._unserialize(filechange[0])
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def add(self, revid_obj_pairs):
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for (r, d) in revid_obj_pairs:
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self.cursor.execute(_insert_stmt, (r, self._serialize(d)))
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self.connection.commit()
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class FileChangeCache(object):
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class ChangeCache (object):
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def __init__(self, history, cache_path):
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self.history = history
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self.log = history.log
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if not os.path.exists(cache_path):
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os.mkdir(cache_path)
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self._changes_filename = os.path.join(cache_path, 'filechanges.sql')
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# use a lockfile since the cache folder could be shared across
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# different processes.
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self._lock = LockFile(os.path.join(cache_path, 'filechange-lock'))
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def get_file_changes(self, entries):
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# keep a separate cache for the diffs, because they're very time-consuming to fetch.
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self._changes_filename = os.path.join(cache_path, 'changes')
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self._changes_diffs_filename = os.path.join(cache_path, 'changes-diffs')
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# use a lockfile since the cache folder could be shared across different processes.
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self._lock = LockFile(os.path.join(cache_path, 'lock'))
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# this is fluff; don't slow down startup time with it.
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self.log.info('Using change cache %s; %d/%d entries.' % (cache_path, s1, s2))
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threading.Thread(target=log_sizes).start()
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self.log.debug('Closing cache file.')
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def get_changes(self, revid_list, get_diffs=False):
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get a list of changes by their revision_ids. any changes missing
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from the cache are fetched by calling L{History.get_change_uncached}
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and inserted into the cache before returning.
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cache = shelve.open(self._changes_diffs_filename, 'c', protocol=2)
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cache = shelve.open(self._changes_filename, 'c', protocol=2)
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missing_entry_indices = []
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cache = FakeShelf(self._changes_filename)
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for entry in entries:
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changes = cache.get(entry.revid)
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if changes is not None:
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for revid in revid_list:
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# if the revid is in unicode, use the utf-8 encoding as the key
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srevid = util.to_utf8(revid)
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out.append(cache[srevid])
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missing_entries.append(entry)
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missing_entry_indices.append(len(out))
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#self.log.debug('Entry cache miss: %r' % (revid,))
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missing_changes = self.history.get_file_changes_uncached(missing_entries)
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revid_changes_pairs = []
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for i, entry, changes in zip(
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missing_entry_indices, missing_entries, missing_changes):
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revid_changes_pairs.append((entry.revid, changes))
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cache.add(revid_changes_pairs)
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fetch_list.append(revid)
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sfetch_list.append(srevid)
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if len(fetch_list) > 0:
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# some revisions weren't in the cache; fetch them
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changes = self.history.get_changes_uncached(fetch_list, get_diffs)
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for i in xrange(len(revid_list)):
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cache[sfetch_list.pop(0)] = out[i] = changes.pop(0)
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def full(self, get_diffs=False):
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cache = shelve.open(self._changes_diffs_filename, 'c', protocol=2)
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cache = shelve.open(self._changes_filename, 'c', protocol=2)
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return (len(cache) >= len(self.history.get_revision_history())) and (util.to_utf8(self.history.last_revid) in cache)
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cache = shelve.open(self._changes_filename, 'c', protocol=2)
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cache = shelve.open(self._changes_diffs_filename, 'c', protocol=2)
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def check_rebuild(self, max_time=3600):
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check if we need to fill in any missing pieces of the cache. pull in
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any missing changes, but don't work any longer than C{max_time}
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if self.closed() or self.full():
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self.log.info('Building revision cache...')
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start_time = time.time()
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last_update = time.time()
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work = list(self.history.get_revision_history())
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for i in xrange(0, len(work), jump):
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# must call into history so we grab the branch lock (otherwise, lock inversion)
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self.history.get_changes(r)
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if now - start_time > max_time:
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self.log.info('Cache rebuilding will pause for now.')
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if now - last_update > 60:
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self.log.info('Revision cache rebuilding continues: %d/%d' % (min(count, len(work)), len(work)))
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last_update = time.time()
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# give someone else a chance at the lock
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self.log.info('Revision cache rebuild completed.')
added
removed
loggerhead/changecache.py
