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# Copyright 2014-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import errno
import io
import json
import os
from portage import _encodings
from portage.util import atomic_ofstream
from portage.versions import cpv_getkey
class VdbMetadataDelta(object):
_format_version = "1"
def __init__(self, vardb):
self._vardb = vardb
def initialize(self, timestamp):
f = atomic_ofstream(self._vardb._cache_delta_filename, 'w',
encoding=_encodings['repo.content'], errors='strict')
json.dump({
"version": self._format_version,
"timestamp": timestamp
}, f, ensure_ascii=False)
f.close()
def load(self):
if not os.path.exists(self._vardb._aux_cache_filename):
# If the primary cache doesn't exist yet, then
# we can't record a delta against it.
return None
try:
with io.open(self._vardb._cache_delta_filename, 'r',
encoding=_encodings['repo.content'],
errors='strict') as f:
cache_obj = json.load(f)
except EnvironmentError as e:
if e.errno not in (errno.ENOENT, errno.ESTALE):
raise
except (SystemExit, KeyboardInterrupt):
raise
except Exception:
# Corrupt, or not json format.
pass
else:
try:
version = cache_obj["version"]
except KeyError:
pass
else:
# Verify that the format version is compatible,
# since a newer version of portage may have
# written an incompatible file.
if version == self._format_version:
try:
deltas = cache_obj["deltas"]
except KeyError:
cache_obj["deltas"] = deltas = []
if isinstance(deltas, list):
return cache_obj
return None
def loadRace(self):
"""
This calls self.load() and validates the timestamp
against the currently loaded self._vardb._aux_cache. If a
concurrent update causes the timestamps to be inconsistent,
then it reloads the caches and tries one more time before
it aborts. In practice, the race is very unlikely, so
this will usually succeed on the first try.
"""
tries = 2
while tries:
tries -= 1
cache_delta = self.load()
if cache_delta is not None and \
cache_delta.get("timestamp") != \
self._vardb._aux_cache.get("timestamp", False):
self._vardb._aux_cache_obj = None
else:
return cache_delta
return None
def recordEvent(self, event, cpv, slot, counter):
self._vardb.lock()
try:
deltas_obj = self.load()
if deltas_obj is None:
# We can't record meaningful deltas without
# a pre-existing state.
return
delta_node = {
"event": event,
"package": cpv.cp,
"version": cpv.version,
"slot": slot,
"counter": "%s" % counter
}
deltas_obj["deltas"].append(delta_node)
# Eliminate earlier nodes cancelled out by later nodes
# that have identical package and slot attributes.
filtered_list = []
slot_keys = set()
version_keys = set()
for delta_node in reversed(deltas_obj["deltas"]):
slot_key = (delta_node["package"],
delta_node["slot"])
version_key = (delta_node["package"],
delta_node["version"])
if not (slot_key in slot_keys or \
version_key in version_keys):
filtered_list.append(delta_node)
slot_keys.add(slot_key)
version_keys.add(version_key)
filtered_list.reverse()
deltas_obj["deltas"] = filtered_list
f = atomic_ofstream(self._vardb._cache_delta_filename,
mode='w', encoding=_encodings['repo.content'])
json.dump(deltas_obj, f, ensure_ascii=False)
f.close()
finally:
self._vardb.unlock()
def applyDelta(self, data):
packages = self._vardb._aux_cache["packages"]
deltas = {}
for delta in data["deltas"]:
cpv = delta["package"] + "-" + delta["version"]
deltas[cpv] = delta
event = delta["event"]
if event == "add":
# Use aux_get to populate the cache
# for this cpv.
if cpv not in packages:
try:
self._vardb.aux_get(cpv, ["DESCRIPTION"])
except KeyError:
pass
elif event == "remove":
packages.pop(cpv, None)
if deltas:
# Delete removed or replaced versions from affected slots
for cached_cpv, (mtime, metadata) in list(packages.items()):
if cached_cpv in deltas:
continue
removed = False
for cpv, delta in deltas.items():
if (cached_cpv.startswith(delta["package"]) and
metadata.get("SLOT") == delta["slot"] and
cpv_getkey(cached_cpv) == delta["package"]):
removed = True
break
if removed:
del packages[cached_cpv]
del deltas[cpv]
if not deltas:
break
|
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