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# Copyright 1999-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $
from portage.cache import fs_template
from portage.cache import cache_errors
import os
from portage.cache.template import reconstruct_eclasses
from portage.util import writemsg, apply_secpass_permissions
from portage.data import portage_gid
try:
import sqlite3 as db_module # sqlite3 is optional with >=python-2.5
except ImportError:
from pysqlite2 import dbapi2 as db_module
DBError = db_module.Error
class database(fs_template.FsBased):
autocommits = False
synchronous = False
# cache_bytes is used together with page_size (set at sqlite build time)
# to calculate the number of pages requested, according to the following
# equation: cache_bytes = page_bytes * page_count
cache_bytes = 1024 * 1024 * 10
_db_module = db_module
_db_error = DBError
_db_table = None
def __init__(self, *args, **config):
super(database, self).__init__(*args, **config)
self._allowed_keys = ["_mtime_", "_eclasses_"] + self._known_keys
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()
config.setdefault("autocommit", self.autocommits)
config.setdefault("cache_bytes", self.cache_bytes)
config.setdefault("synchronous", self.synchronous)
# Timeout for throwing a "database is locked" exception (pysqlite
# default is 5.0 seconds).
config.setdefault("timeout", 15)
self._db_init_connection(config)
self._db_init_structures()
def _db_escape_string(self, s):
"""meta escaping, returns quoted string for use in sql statements"""
# This is equivalent to the _quote function from pysqlite 1.1.
return "'%s'" % str(s).replace("'","''")
def _db_init_connection(self, config):
self._dbpath = self.location + ".sqlite"
#if os.path.exists(self._dbpath):
# os.unlink(self._dbpath)
connection_kwargs = {}
connection_kwargs["timeout"] = config["timeout"]
try:
self._ensure_dirs()
self._db_connection = self._db_module.connect(
database=self._dbpath, **connection_kwargs)
self._db_cursor = self._db_connection.cursor()
self._db_cursor.execute("PRAGMA encoding = %s" % self._db_escape_string("UTF-8"))
if not apply_secpass_permissions(self._dbpath, gid=portage_gid, mode=070, mask=02):
raise cache_errors.InitializationError(self.__class__, "can't ensure perms on %s" % self._dbpath)
self._db_init_cache_size(config["cache_bytes"])
self._db_init_synchronous(config["synchronous"])
except self._db_error, e:
raise cache_errors.InitializationError(self.__class__, e)
def _db_init_structures(self):
self._db_table = {}
self._db_table["packages"] = {}
mytable = "portage_packages"
self._db_table["packages"]["table_name"] = mytable
self._db_table["packages"]["package_id"] = "internal_db_package_id"
self._db_table["packages"]["package_key"] = "portage_package_key"
self._db_table["packages"]["internal_columns"] = \
[self._db_table["packages"]["package_id"],
self._db_table["packages"]["package_key"]]
create_statement = []
create_statement.append("CREATE TABLE")
create_statement.append(mytable)
create_statement.append("(")
table_parameters = []
table_parameters.append("%s INTEGER PRIMARY KEY AUTOINCREMENT" % self._db_table["packages"]["package_id"])
table_parameters.append("%s TEXT" % self._db_table["packages"]["package_key"])
for k in self._allowed_keys:
table_parameters.append("%s TEXT" % k)
table_parameters.append("UNIQUE(%s)" % self._db_table["packages"]["package_key"])
create_statement.append(",".join(table_parameters))
create_statement.append(")")
self._db_table["packages"]["create"] = " ".join(create_statement)
self._db_table["packages"]["columns"] = \
self._db_table["packages"]["internal_columns"] + \
self._allowed_keys
cursor = self._db_cursor
for k, v in self._db_table.iteritems():
if self._db_table_exists(v["table_name"]):
create_statement = self._db_table_get_create(v["table_name"])
if create_statement != v["create"]:
writemsg("sqlite: dropping old table: %s\n" % v["table_name"])
cursor.execute("DROP TABLE %s" % v["table_name"])
cursor.execute(v["create"])
else:
cursor.execute(v["create"])
def _db_table_exists(self, table_name):
"""return true/false dependant on a tbl existing"""
cursor = self._db_cursor
cursor.execute("SELECT name FROM sqlite_master WHERE type=\"table\" AND name=%s" % \
self._db_escape_string(table_name))
return len(cursor.fetchall()) == 1
def _db_table_get_create(self, table_name):
"""return true/false dependant on a tbl existing"""
cursor = self._db_cursor
cursor.execute("SELECT sql FROM sqlite_master WHERE name=%s" % \
self._db_escape_string(table_name))
return cursor.fetchall()[0][0]
def _db_init_cache_size(self, cache_bytes):
cursor = self._db_cursor
cursor.execute("PRAGMA page_size")
page_size=int(cursor.fetchone()[0])
# number of pages, sqlite default is 2000
cache_size = cache_bytes / page_size
cursor.execute("PRAGMA cache_size = %d" % cache_size)
cursor.execute("PRAGMA cache_size")
actual_cache_size = int(cursor.fetchone()[0])
del cursor
if actual_cache_size != cache_size:
raise cache_errors.InitializationError(self.__class__,"actual cache_size = "+actual_cache_size+" does does not match requested size of "+cache_size)
def _db_init_synchronous(self, synchronous):
cursor = self._db_cursor
cursor.execute("PRAGMA synchronous = %d" % synchronous)
cursor.execute("PRAGMA synchronous")
actual_synchronous=int(cursor.fetchone()[0])
del cursor
if actual_synchronous!=synchronous:
raise cache_errors.InitializationError(self.__class__,"actual synchronous = "+actual_synchronous+" does does not match requested value of "+synchronous)
def __getitem__(self, cpv):
cursor = self._db_cursor
cursor.execute("select * from %s where %s=%s" % \
(self._db_table["packages"]["table_name"],
self._db_table["packages"]["package_key"],
self._db_escape_string(cpv)))
result = cursor.fetchall()
if len(result) == 1:
pass
elif len(result) == 0:
raise KeyError(cpv)
else:
raise cache_errors.CacheCorruption(cpv, "key is not unique")
d = {}
internal_columns = self._db_table["packages"]["internal_columns"]
column_index = -1
for k in self._db_table["packages"]["columns"]:
column_index +=1
if k not in internal_columns:
d[k] = result[0][column_index]
# XXX: The resolver chokes on unicode strings so we convert them here.
for k in d.keys():
try:
d[k]=str(d[k]) # convert unicode strings to normal
except UnicodeEncodeError, e:
pass #writemsg("%s: %s\n" % (cpv, str(e)))
if "_eclasses_" in d:
d["_eclasses_"] = reconstruct_eclasses(cpv, d["_eclasses_"])
else:
d["_eclasses_"] = {}
for x in self._known_keys:
d.setdefault(x,'')
return d
def _setitem(self, cpv, values):
update_statement = []
update_statement.append("REPLACE INTO %s" % self._db_table["packages"]["table_name"])
update_statement.append("(")
update_statement.append(','.join([self._db_table["packages"]["package_key"]] + self._allowed_keys))
update_statement.append(")")
update_statement.append("VALUES")
update_statement.append("(")
values_parameters = []
values_parameters.append(self._db_escape_string(cpv))
for k in self._allowed_keys:
values_parameters.append(self._db_escape_string(values.get(k, '')))
update_statement.append(",".join(values_parameters))
update_statement.append(")")
cursor = self._db_cursor
try:
s = " ".join(update_statement)
cursor.execute(s)
except self._db_error, e:
writemsg("%s: %s\n" % (cpv, str(e)))
raise
def commit(self):
self._db_connection.commit()
def _delitem(self, cpv):
cursor = self._db_cursor
cursor.execute("DELETE FROM %s WHERE %s=%s" % \
(self._db_table["packages"]["table_name"],
self._db_table["packages"]["package_key"],
self._db_escape_string(cpv)))
def __contains__(self, cpv):
cursor = self._db_cursor
cursor.execute(" ".join(
["SELECT %s FROM %s" %
(self._db_table["packages"]["package_id"],
self._db_table["packages"]["table_name"]),
"WHERE %s=%s" % (
self._db_table["packages"]["package_key"],
self._db_escape_string(cpv))]))
result = cursor.fetchall()
if len(result) == 0:
return False
elif len(result) == 1:
return True
else:
raise cache_errors.CacheCorruption(cpv, "key is not unique")
def __iter__(self):
"""generator for walking the dir struct"""
cursor = self._db_cursor
cursor.execute("SELECT %s FROM %s" % \
(self._db_table["packages"]["package_key"],
self._db_table["packages"]["table_name"]))
result = cursor.fetchall()
key_list = [x[0] for x in result]
del result
while key_list:
yield key_list.pop()
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