/usr/lib/python2.7/dist-packages/Pyro4/naming_storage.py is in python2-pyro4 4.63-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name Server persistent storage implementations.
Pyro - Python Remote Objects. Copyright by Irmen de Jong (irmen@razorvine.net).
"""
import re
import logging
import sys
import threading
from collections import MutableMapping
from contextlib import closing
from Pyro4.errors import NamingError
try:
import anydbm as dbm # python 2
except ImportError:
try:
import dbm # python 3
except ImportError:
dbm = None
except Exception as x:
# pypy can generate a distutils error somehow if dbm is not available
dbm = None
try:
import sqlite3
except ImportError:
sqlite3 = None
log = logging.getLogger("Pyro4.naming_storage")
class SqlStorage(MutableMapping):
"""
Sqlite-based storage.
It is just a single (name,uri) table for the names and another table for the metadata.
Sqlite db connection objects aren't thread-safe, so a new connection is created in every method.
"""
def __init__(self, dbfile):
if dbfile == ":memory:":
raise ValueError("We don't support the sqlite :memory: database type. Just use the default volatile in-memory store.")
self.dbfile = dbfile
with closing(sqlite3.connect(dbfile)) as db:
db.execute("PRAGMA foreign_keys=ON")
try:
db.execute("SELECT COUNT(*) FROM pyro_names").fetchone()
except sqlite3.OperationalError:
# the table does not yet exist
self._create_schema(db)
else:
# check if we need to update the existing schema
try:
db.execute("SELECT COUNT(*) FROM pyro_metadata").fetchone()
except sqlite3.OperationalError:
# metadata schema needs to be created and existing data migrated
db.execute("ALTER TABLE pyro_names RENAME TO pyro_names_old")
self._create_schema(db)
db.execute("INSERT INTO pyro_names(name, uri) SELECT name, uri FROM pyro_names_old")
db.execute("DROP TABLE pyro_names_old")
db.commit()
def _create_schema(self, db):
db.execute("""CREATE TABLE pyro_names
(
id integer PRIMARY KEY,
name nvarchar NOT NULL UNIQUE,
uri nvarchar NOT NULL
);""")
db.execute("""CREATE TABLE pyro_metadata
(
object integer NOT NULL,
metadata nvarchar NOT NULL,
FOREIGN KEY(object) REFERENCES pyro_names(id)
);""")
def __getattr__(self, item):
raise NotImplementedError("SqlStorage doesn't implement method/attribute '" + item + "'")
def __getitem__(self, item):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
result = db.execute("SELECT id, uri FROM pyro_names WHERE name=?", (item,)).fetchone()
if result:
dbid, uri = result
metadata = {m[0] for m in db.execute("SELECT metadata FROM pyro_metadata WHERE object=?", (dbid,)).fetchall()}
return uri, metadata
else:
raise KeyError(item)
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in getitem: " + str(e))
def __setitem__(self, key, value):
uri, metadata = value
try:
with closing(sqlite3.connect(self.dbfile)) as db:
cursor = db.cursor()
cursor.execute("PRAGMA foreign_keys=ON")
dbid = cursor.execute("SELECT id FROM pyro_names WHERE name=?", (key,)).fetchone()
if dbid:
dbid = dbid[0]
cursor.execute("DELETE FROM pyro_metadata WHERE object=?", (dbid,))
cursor.execute("DELETE FROM pyro_names WHERE id=?", (dbid,))
cursor.execute("INSERT INTO pyro_names(name, uri) VALUES(?,?)", (key, uri))
if metadata:
object_id = cursor.lastrowid
for m in metadata:
cursor.execute("INSERT INTO pyro_metadata(object, metadata) VALUES (?,?)", (object_id, m))
cursor.close()
db.commit()
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in setitem: " + str(e))
def __len__(self):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
return db.execute("SELECT count(*) FROM pyro_names").fetchone()[0]
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in len: " + str(e))
def __contains__(self, item):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
return db.execute("SELECT EXISTS(SELECT 1 FROM pyro_names WHERE name=? LIMIT 1)", (item,)).fetchone()[0]
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in contains: " + str(e))
def __delitem__(self, key):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
db.execute("PRAGMA foreign_keys=ON")
dbid = db.execute("SELECT id FROM pyro_names WHERE name=?", (key,)).fetchone()
if dbid:
dbid = dbid[0]
db.execute("DELETE FROM pyro_metadata WHERE object=?", (dbid,))
db.execute("DELETE FROM pyro_names WHERE id=?", (dbid,))
db.commit()
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in delitem: " + str(e))
def __iter__(self):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
result = db.execute("SELECT name FROM pyro_names")
return iter([n[0] for n in result.fetchall()])
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in iter: " + str(e))
def clear(self):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
db.execute("PRAGMA foreign_keys=ON")
db.execute("DELETE FROM pyro_metadata")
db.execute("DELETE FROM pyro_names")
db.commit()
with closing(sqlite3.connect(self.dbfile, isolation_level=None)) as db:
db.execute("VACUUM") # this cannot run inside a transaction.
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in clear: " + str(e))
def optimized_prefix_list(self, prefix, return_metadata=False):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
names = {}
if return_metadata:
for dbid, name, uri in db.execute("SELECT id, name, uri FROM pyro_names WHERE name LIKE ?", (prefix + '%',)).fetchall():
metadata = {m[0] for m in db.execute("SELECT metadata FROM pyro_metadata WHERE object=?", (dbid,)).fetchall()}
names[name] = uri, metadata
else:
for name, uri in db.execute("SELECT name, uri FROM pyro_names WHERE name LIKE ?", (prefix + '%',)).fetchall():
names[name] = uri
return names
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in optimized_prefix_list: " + str(e))
def optimized_regex_list(self, regex, return_metadata=False):
# defining a regex function isn't much better than simply regexing ourselves over the full table.
return None
def optimized_metadata_search(self, metadata_all=None, metadata_any=None, return_metadata=False):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
if metadata_any:
# any of the given metadata
params = list(metadata_any)
sql = "SELECT id, name, uri FROM pyro_names WHERE id IN (SELECT object FROM pyro_metadata WHERE metadata IN ({seq}))" \
.format(seq=",".join(['?'] * len(metadata_any)))
else:
# all of the given metadata
params = list(metadata_all)
params.append(len(metadata_all))
sql = "SELECT id, name, uri FROM pyro_names WHERE id IN (SELECT object FROM pyro_metadata WHERE metadata IN ({seq}) " \
"GROUP BY object HAVING COUNT(metadata)=?)".format(seq=",".join(['?'] * len(metadata_all)))
result = db.execute(sql, params).fetchall()
if return_metadata:
names = {}
for dbid, name, uri in result:
metadata = {m[0] for m in db.execute("SELECT metadata FROM pyro_metadata WHERE object=?", (dbid,)).fetchall()}
names[name] = uri, metadata
else:
names = {name: uri for (dbid, name, uri) in result}
return names
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in optimized_metadata_search: " + str(e))
def remove_items(self, items):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
db.execute("PRAGMA foreign_keys=ON")
for item in items:
dbid = db.execute("SELECT id FROM pyro_names WHERE name=?", (item,)).fetchone()
if dbid:
dbid = dbid[0]
db.execute("DELETE FROM pyro_metadata WHERE object=?", (dbid,))
db.execute("DELETE FROM pyro_names WHERE id=?", (dbid,))
db.commit()
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in remove_items: " + str(e))
def everything(self, return_metadata=False):
try:
with closing(sqlite3.connect(self.dbfile)) as db:
names = {}
if return_metadata:
for dbid, name, uri in db.execute("SELECT id, name, uri FROM pyro_names").fetchall():
metadata = {m[0] for m in db.execute("SELECT metadata FROM pyro_metadata WHERE object=?", (dbid,)).fetchall()}
names[name] = uri, metadata
else:
for name, uri in db.execute("SELECT name, uri FROM pyro_names").fetchall():
names[name] = uri
return names
except sqlite3.DatabaseError as e:
raise NamingError("sqlite error in everything: " + str(e))
def close(self):
pass
class DbmStorage(MutableMapping):
"""
Storage implementation that uses a persistent dbm file.
Because dbm only supports strings as key/value, we encode/decode them in utf-8.
Dbm files cannot be accessed concurrently, so a strict concurrency model
is used where only one operation is processed at the same time
(this is very slow when compared to the in-memory storage)
DbmStorage does NOT support storing metadata! It only accepts empty metadata,
and always returns empty metadata.
"""
def __init__(self, dbmfile):
self.dbmfile = dbmfile
db = dbm.open(self.dbmfile, "c", mode=0o600)
db.close()
self.lock = threading.Lock()
def __getattr__(self, item):
raise NotImplementedError("DbmStorage doesn't implement method/attribute '" + item + "'")
def __getitem__(self, item):
item = item.encode("utf-8")
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
return db[item].decode("utf-8"), frozenset() # always return empty metadata
except dbm.error as e:
raise NamingError("dbm error in getitem: " + str(e))
def __setitem__(self, key, value):
uri, metadata = value
if metadata:
log.warning("DbmStorage doesn't support metadata, silently discarded")
key = key.encode("utf-8")
uri = uri.encode("utf-8")
with self.lock:
try:
with closing(dbm.open(self.dbmfile, "w")) as db:
db[key] = uri
except dbm.error as e:
raise NamingError("dbm error in setitem: " + str(e))
def __len__(self):
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
return len(db)
except dbm.error as e:
raise NamingError("dbm error in len: " + str(e))
def __contains__(self, item):
item = item.encode("utf-8")
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
return item in db
except dbm.error as e:
raise NamingError("dbm error in contains: " + str(e))
def __delitem__(self, key):
key = key.encode("utf-8")
with self.lock:
try:
with closing(dbm.open(self.dbmfile, "w")) as db:
del db[key]
except dbm.error as e:
raise NamingError("dbm error in delitem: " + str(e))
def __iter__(self):
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
return iter([key.decode("utf-8") for key in db.keys()])
except dbm.error as e:
raise NamingError("dbm error in iter: " + str(e))
def clear(self):
with self.lock:
try:
with closing(dbm.open(self.dbmfile, "w")) as db:
if hasattr(db, "clear"):
db.clear()
else:
for key in db.keys():
del db[key]
except dbm.error as e:
raise NamingError("dbm error in clear: " + str(e))
def optimized_prefix_list(self, prefix, return_metadata=False):
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
result = {}
if hasattr(db, "items"):
for key, value in db.items():
key = key.decode("utf-8")
if key.startswith(prefix):
uri = value.decode("utf-8")
result[key] = (uri, frozenset()) if return_metadata else uri # always return empty metadata
else:
for key in db.keys():
keystr = key.decode("utf-8")
if keystr.startswith(prefix):
uri = db[key].decode("utf-8")
result[keystr] = (uri, frozenset()) if return_metadata else uri # always return empty metadata
return result
except dbm.error as e:
raise NamingError("dbm error in optimized_prefix_list: " + str(e))
def optimized_regex_list(self, regex, return_metadata=False):
try:
regex = re.compile(regex + "$") # add end of string marker
except re.error as x:
raise NamingError("invalid regex: " + str(x))
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
result = {}
if hasattr(db, "items"):
for key, value in db.items():
key = key.decode("utf-8")
if regex.match(key):
uri = value.decode("utf-8")
result[key] = (uri, frozenset()) if return_metadata else uri # always return empty metadata
else:
for key in db.keys():
keystr = key.decode("utf-8")
if regex.match(keystr):
uri = db[key].decode("utf-8")
result[keystr] = (uri, frozenset()) if return_metadata else uri # always return empty metadata
return result
except dbm.error as e:
raise NamingError("dbm error in optimized_regex_list: " + str(e))
def optimized_metadata_search(self, metadata_all=None, metadata_any=None, return_metadata=False):
if metadata_all or metadata_any:
raise NamingError("DbmStorage doesn't support metadata")
return self.everything(return_metadata)
def remove_items(self, items):
with self.lock:
try:
with closing(dbm.open(self.dbmfile, "w")) as db:
for item in items:
try:
del db[item.encode("utf-8")]
except KeyError:
pass
except dbm.error as e:
raise NamingError("dbm error in remove_items: " + str(e))
def everything(self, return_metadata=False):
with self.lock:
try:
with closing(dbm.open(self.dbmfile)) as db:
result = {}
if hasattr(db, "items"):
for key, value in db.items():
uri = value.decode("utf-8")
result[key.decode("utf-8")] = (uri, frozenset()) if return_metadata else uri # always return empty metadata
else:
for key in db.keys():
uri = db[key].decode("utf-8")
result[key.decode("utf-8")] = (uri, frozenset()) if return_metadata else uri # always return empty metadata
return result
except dbm.error as e:
raise NamingError("dbm error in everything: " + str(e))
def close(self):
pass
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