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# Copyright: 2005 Gentoo Foundation
# Author(s): Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Id$
from cache import fs_template
from cache import cache_errors
import errno, os, stat
from cache.mappings import LazyLoad, ProtectedDict
from cache.template import reconstruct_eclasses
# store the current key order *here*.
class database(fs_template.FsBased):
autocommits = True
def __init__(self, *args, **config):
super(database,self).__init__(*args, **config)
self.location = os.path.join(self.location,
self.label.lstrip(os.path.sep).rstrip(os.path.sep))
if not os.path.exists(self.location):
self._ensure_dirs()
def __getitem__(self, cpv):
fp = os.path.join(self.location, cpv)
try:
def curry(*args):
def callit(*args2):
return args[0](*args[1:]+args2)
return callit
return ProtectedDict(LazyLoad(curry(self._pull, fp, cpv),
initial_items=[("_mtime_", long(os.stat(fp).st_mtime))]))
except OSError:
raise KeyError(cpv)
return self._getitem(cpv)
def _pull(self, fp, cpv):
try:
myf = open(fp,"r")
except IOError:
raise KeyError(cpv)
except OSError, e:
raise cache_errors.CacheCorruption(cpv, e)
try:
d = self._parse_data(myf, cpv)
except (OSError, ValueError), e:
myf.close()
raise cache_errors.CacheCorruption(cpv, e)
myf.close()
return d
def _parse_data(self, data, cpv, mtime=0):
d = dict(map(lambda x:x.rstrip().split("=", 1), data))
if mtime != 0:
d["_mtime_"] = long(mtime)
if "_eclasses_" in d:
d["_eclasses_"] = reconstruct_eclasses(cpv, d["_eclasses_"])
return d
for x in self._known_keys:
if x not in d:
d[x] = ''
return d
def _setitem(self, cpv, values):
# import pdb;pdb.set_trace()
s = cpv.rfind("/")
fp = os.path.join(self.location,cpv[:s],".update.%i.%s" % (os.getpid(), cpv[s+1:]))
try: myf=open(fp, "w")
except (IOError, OSError), e:
if errno.ENOENT == e.errno:
try:
self._ensure_dirs(cpv)
myf=open(fp,"w")
except (OSError, IOError),e:
raise cache_errors.CacheCorruption(cpv, e)
else:
raise cache_errors.CacheCorruption(cpv, e)
for k, v in values.iteritems():
if k != "_mtime_" and (k == "_eclasses_" or k in self._known_keys):
myf.write("%s=%s\n" % (k, v))
myf.close()
self._ensure_access(fp, mtime=values["_mtime_"])
#update written. now we move it.
new_fp = os.path.join(self.location,cpv)
try: os.rename(fp, new_fp)
except (OSError, IOError), e:
os.remove(fp)
raise cache_errors.CacheCorruption(cpv, e)
def _delitem(self, cpv):
# import pdb;pdb.set_trace()
try:
os.remove(os.path.join(self.location,cpv))
except OSError, e:
if errno.ENOENT == e.errno:
raise KeyError(cpv)
else:
raise cache_errors.CacheCorruption(cpv, e)
def has_key(self, cpv):
return os.path.exists(os.path.join(self.location, cpv))
def iterkeys(self):
"""generator for walking the dir struct"""
dirs = [self.location]
len_base = len(self.location)
while len(dirs):
for l in os.listdir(dirs[0]):
if l.endswith(".cpickle"):
continue
p = os.path.join(dirs[0],l)
st = os.lstat(p)
if stat.S_ISDIR(st.st_mode):
dirs.append(p)
continue
yield p[len_base+1:]
dirs.pop(0)
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