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# dblite.py module contributed by Ralf W. Grosse-Kunstleve.
import cPickle
import time
import shutil
import os
import __builtin__
_open = __builtin__.open # avoid name clash
keep_all_files = 00000
ignore_corrupt_dbfiles = 0
class dblite:
def __init__(self, file_base_name, flag, mode):
assert flag in (None, "r", "w", "c", "n")
if (flag is None): flag = "r"
if file_base_name[-7:] != '.dblite':
file_base_name = file_base_name + '.dblite'
self._file_name = file_base_name
self._flag = flag
self._mode = mode
self._dict = {}
self._needs_sync = 00000
if (self._flag == "n"):
_open(self._file_name, "wb", self._mode)
else:
try:
f = _open(self._file_name, "rb")
except IOError, e:
if (self._flag != "c"):
raise e
_open(self._file_name, "wb", self._mode)
else:
p = f.read()
if (len(p) > 0):
try:
self._dict = cPickle.loads(p)
except:
if (ignore_corrupt_dbfiles == 0): raise
if (ignore_corrupt_dbfiles == 1):
print "Warning: Discarding corrupt database:", self._file_name
def __del__(self):
if (self._needs_sync):
self.sync()
def sync(self):
self._check_writable()
f = _open(self._file_name, "wb", self._mode)
cPickle.dump(self._dict, f, 1)
f.close()
self._needs_sync = 00000
if (keep_all_files):
shutil.copyfile(
self._file_name,
self._file_name + "_" + str(int(time.time())))
def _check_writable(self):
if (self._flag == "r"):
raise IOError("Read-only database: %s" % self._file_name)
def __getitem__(self, key):
return self._dict[key]
def __setitem__(self, key, value):
self._check_writable()
if (type(key) != type("")):
raise TypeError, "key must be a string"
if (type(value) != type("")):
raise TypeError, "value must be a string"
self._dict[key] = value
self._needs_sync = 0001
def keys(self):
return self._dict.keys()
def has_key(self, key):
return key in self._dict
def __contains__(self, key):
return key in self._dict
def iterkeys(self):
return self._dict.iterkeys()
__iter__ = iterkeys
def __len__(self):
return len(self._dict)
def open(file, flag=None, mode=0666):
return dblite(file, flag, mode)
def _exercise():
db = open("tmp", "n")
assert len(db) == 0
db["foo"] = "bar"
assert db["foo"] == "bar"
db.sync()
db = open("tmp", "c")
assert len(db) == 1
assert db["foo"] == "bar"
db["bar"] = "foo"
assert db["bar"] == "foo"
db.sync()
db = open("tmp", "r")
assert len(db) == 2
assert db["foo"] == "bar"
assert db["bar"] == "foo"
try:
db.sync()
except IOError, e:
assert str(e) == "Read-only database: tmp.dblite"
else:
raise RuntimeError, "IOError expected."
db = open("tmp", "w")
assert len(db) == 2
db["ping"] = "pong"
db.sync()
db = open("tmp", "r")
assert len(db) == 3
db = open("tmp", "n")
assert len(db) == 0
_open("tmp.dblite", "w")
db = open("tmp", "r")
_open("tmp.dblite", "w").write("x")
try:
db = open("tmp", "r")
except cPickle.UnpicklingError:
pass
else:
raise RuntimeError, "cPickle exception expected."
global ignore_corrupt_dbfiles
ignore_corrupt_dbfiles = 2
db = open("tmp", "r")
assert len(db) == 0
os.unlink("tmp.dblite")
try:
db = open("tmp", "w")
except IOError, e:
assert str(e) == "Database does not exist: tmp.dblite"
else:
raise RuntimeError, "IOError expected."
print "OK"
if (__name__ == "__main__"):
_exercise()
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