def remove_directory(self, dir_name):
'''Remove a directory in the current path, if exists.'''
ib = self.get_level_one_current_dir()[1]
f = lambda x: x.is_directory()
del_ref = self.search_name_in_ib(ib, dir_name, False, f)
if del_ref is None:
ib = self.get_level_two_current_dir()[1]
if ib is None:
raise OSException("Error: Directory not found.")
for b in ib.get_blocks():
ib = self.get_llfm().get_disk_at(b)
del_ref = self.search_name_in_ib(ib, dir_name, True, f)
if del_ref is not None:
break
if del_ref is None:
raise OSException("Error: Directory not found.")
elif self.get_llfm().check_empty_dir(del_ref):
ib.remove_index(del_ref)
self.get_llfm().delete_indirections(del_ref)
self.get_llfm().remove_block(del_ref)
self.get_llfm().dump_new_data()
Logger.get_instance().log_del(dir_name, 'directory')
else:
raise OSException(
"Error: Attempt to delete a non-empty directory.")
def change_directory(self, dir_name):
'''
Special cases (. , .. and /) are treated apart, because their position
in the index block are always the same (0 and 1 respectively),
or is the root directory (/).
'''
if dir_name == '.':
pass #nothing to do, it's the same directory
elif dir_name == '..':
new_ref = self.get_level_one_current_dir()[1].get_blocks()[1]
self.set_cwd((self.remove_last_dir_from_path(), new_ref))
elif dir_name == '/':
self.set_cwd(('/', 0)) #shortcut to go to the root
else:
f = lambda x: x.is_directory()
lv_one = self.get_level_one_current_dir()[1]
new_ref = self.search_name_in_ib(lv_one, dir_name, False, f)
if new_ref is None:
(snd_ib_ref, snd_ib) = self.get_level_two_current_dir()
if snd_ib_ref is None:
raise OSException("Error: Directory not found.")
for b in snd_ib.get_blocks():
block = self.get_llfm().get_disk_at(b)
new_ref = self.search_name_in_ib(block, dir_name, True, f)
if new_ref is not None:
break
if new_ref is None:
raise OSException("Error: Directory not found.")
else:
self.set_cwd(((self.get_cwd()[0] + '/' + dir_name), new_ref))
def do_sub_in_mem_cell(self, pcb, mem_cell, cpu_regs, mem):
'''
Operation for data substract, impossible to implement by String.
@raise OSException: can't store in a value !!
'''
raise OSException("Error: can't sub a String !!")
def ren_file(self, old_name, new_name):
'''Rename a file in the current directory. Fail if it's in memory.'''
the_path = self.get_current_path()
if self.search_file_in_memory(the_path + '/' + old_name) is not None:
raise OSException("Error: Can't delete. The file is in memory.")
self.rename(old_name, new_name, lambda x: x.is_file())
Logger.get_instance().log_rename(old_name, new_name, 'file')
def delete(self, file_name):
'''
Delete a file from the file system and delete all its
references, index blocks, and data blocks.
'''
the_path = self.get_current_path()
if self.search_file_in_memory(the_path + '/' + file_name) is not None:
raise OSException("Error: Can't delete. The file is in memory.")
(file_i, file_b) = self.search_file_name(file_name)
fst_lev = file_b.get_level_one_blocks()
self.get_llfm().remove_db_from_ib(self.get_llfm().get_disk_at(fst_lev))
self.get_llfm().remove_block(fst_lev)
snd_i = file_b.get_level_two_blocks()
if snd_i is not None:
snd_b = self.get_llfm().get_disk_at(snd_i)
for b in snd_b.get_blocks():
block = self.get_llfm().get_disk_at(b)
self.get_llfm().remove_db_from_ib(block)
self.get_llfm().remove_db_from_ib(snd_b)
self.get_llfm().remove_block(snd_i)
self.get_llfm().remove_block(file_i)
try:
self.get_level_one_current_dir()[1].remove_index(file_i)
except:
lt = self.get_level_two_current_dir()[1]
if lt is not None:
for b in lt.get_blocks():
try:
self.get_llfm().get_disk_at(b).remove_index(file_i)
except:
continue
self.get_llfm().dump_new_data()
Logger.get_instance().log_del(file_name, 'file')
def write(self, file_name, data):
'''Write to the end of a file given, a data also given.'''
the_path = self.get_current_path()
the_file = self.search_file_in_memory(the_path + '/' + file_name)
if the_file is None:
raise OSException("Error: The file isn't open or doesn't exists.")
the_file.append_data(data)
def save(self, file_name):
'''
Synchronize the contents of a file in memory
and persist its data in the disk.
'''
the_path = self.get_current_path()
the_file = self.search_file_in_memory(the_path + '/' + file_name)
if the_file is None:
raise OSException("Error: File isn't in memory or doesn't exists.")
data = the_file.get_data()
file_inode = self.get_llfm().get_disk_at(the_file.get_disk_pos())
file_inode.set_size(the_file.get_size())
fst_ib = self.get_llfm().get_disk_at(file_inode.get_level_one_blocks())
data = self.set_data_to_blocks(fst_ib, data)
if file_inode.get_level_two_blocks() is None and not data == '':
ltb = self.get_llfm().create_ib_for_two_level()
file_inode.set_level_two_blocks(ltb)
snd_ib = self.get_llfm().get_disk_at(file_inode.get_level_two_blocks())
if not data == '':
for iblock in snd_ib.get_blocks():
curr_ib = self.get_llfm().get_disk_at(iblock)
data = self.set_data_to_blocks(curr_ib, data)
if data == '':
break
self.get_llfm().dump_new_data()
Logger.get_instance().log_datasaved(file_name)
def open(self, name, rw=True):
'''
Loads a file into the memory.
If it's already loaded, updates its ref_count.
'''
complete_name = self.get_cwd()[0] + '/' + name
if self.is_opened(complete_name):
self.search_file_in_memory(complete_name).inc_ref_count()
else:
(file_i, file_b) = self.search_file_name(name)
res = ''
fst_ib = self.get_llfm().get_disk_at(file_b.get_level_one_blocks())
for index in fst_ib.get_blocks():
curr_db = self.get_llfm().get_disk_at(index)
if curr_db is not None:
res += curr_db.get_data() #appending each block (1st ind)
snd_ib = self.get_llfm().get_disk_at(file_b.get_level_two_blocks())
if snd_ib is not None: #there are more data
for ib in snd_ib.get_blocks():
iblock = self.get_llfm().get_disk_at(ib)
for dbi in iblock.get_blocks():
curr_db = self.get_llfm().get_disk_at(dbi)
if curr_db is not None:
res += curr_db.get_data()
if not self.check_available_space():
raise OSException('Error: Full memory.')
else:
date = file_b.get_date()
size = file_b.get_size()
open_file = File(complete_name, rw, date, res, file_i, size)
pos = self.store_in_memory(open_file)
Logger.get_instance().log_openfile(name, pos)
return pos
def do_mov(self, pcb, another_parameter, cpu_regs, mem):
'''
Operation for data moving, impossible to implement in String.
@raise OSException: can't store in a value !!
'''
raise OSException("Error: cant' mov (store) a value in a value !!")
def do_sub(self, pcb, another_parameter, cpu_regs, mem):
'''
Operation for data substract, impossible to implement by String as a
first argument.
@raise OSException: can't store in a value !!
'''
raise OSException("Error: can't sub and then store in a value !!")
def do_add(self, pcb, another_parameter, cpu_regs, mem):
'''
Operation for data adding, impossible to implement by Number as a
first argument.
@raise OSException: can't store in a value !!
'''
raise OSException("Error: can't add and then store in a value !!")
def __get_and_check_real_address(self, pcb, address):
'''
Checks if an address is valid to the pcb given.
If it's valid, returns it.
'''
real_address = pcb.get_base_reg() + address
if real_address > pcb.get_limit_reg():
raise OSException("Error: Process out of addressing space")
else:
return real_address
def search_file_name(self, name):
'''Search for a file name and return its position and its block.'''
f = lambda x: x.is_file()
lev_one_dir = self.get_level_one_current_dir()[1]
res_i = self.search_name_in_ib(lev_one_dir, name, True, f)
if res_i is not None:
return (res_i, self.get_llfm().get_disk_at(res_i))
else:
(snd_ib_ref, snd_ib) = self.get_level_two_current_dir()
if snd_ib_ref is None:
raise OSException("Error: File not found.")
for b in snd_ib.get_blocks():
curr_ib = self.get_llfm().get_disk_at(b)
res_i = self.search_name_in_ib(curr_ib, name, True, f)
if res_i is not None:
break
if res_i is not None:
return (res_i, self.get_llfm().get_disk_at(res_i))
else:
raise OSException("Error: File not found.")
def rename(self, old_name, new_name, f):
'''
Generic method. Rename directories or files.
@param f: a function that determines if the element
is a file or directory.
'''
lev_one = self.get_level_one_current_dir()[1]
new_ref = self.search_name_in_ib(lev_one, old_name, False, f)
if new_ref is None:
(snd_ib_ref, snd_ib) = self.get_level_two_current_dir()
if snd_ib_ref is None:
raise OSException("Error: Directory or file not found.")
for b in snd_ib.get_blocks():
block = self.get_llfm().get_disk_at(b)
new_ref = self.search_name_in_ib(block, old_name, True, f)
if new_ref is not None:
break
if new_ref is None:
raise OSException("Error: Directory or file not found.")
self.get_llfm().get_disk_at(new_ref).set_name(new_name)
self.get_llfm().dump_new_data()
def __init__(self, regex_filter=None, interval=None, kind='Security'):
if os.name != 'nt':
raise OSException('This parser works only on Windows machine!')
self.regex_filter = regex_filter
self.interval = interval
# ova dva bih mogao citati iz configa isto
# ili mozda ipak ni ne treba
self.server = 'localhost' # name of the target computer to get event logs
self.logtype = kind
self.hand = win32evtlog.OpenEventLog(self.server, self.logtype)
self.flags = win32evtlog.EVENTLOG_BACKWARDS_READ | win32evtlog.EVENTLOG_SEQUENTIAL_READ
self.total = win32evtlog.GetNumberOfEventLogRecords(self.hand)
Thread.__init__(self)
self.last_log_timestamp = datetime.now()
def load(self, file_name):
'''
Executes a file storaged in the file system, in the folder "programs".
First load the loader :-) , to leave in memory the program to run.
'''
if self.__loader_is_running():
raise OSException('Error: The loader is running.')
loader = self.__make_loader(file_name)
self.__set_time_parameters(loader)
banker = self.get_cpu().get_banker()
banker.loader_come(banker.calculate_new_max(loader.get_pcb()))
self.get_process_store().put_in_all_process(loader)
self.get_process_store().put_in_ready_queue(loader.get_pcb())
while Memory.get_instance().get_value_at(1) is None:
time.sleep(1)
self.__load_program(Memory.get_instance().get_value_at(1))
Memory.get_instance().remove(1)
def add_program(self, file_name, new_name):
'''
Take a file from the real disk and put in the file system,
in the folder "programs", in the root directory.
@param new_name: the name that the file will have in the file system.
@precondition: This method only must be executed in console mode.
'''
try:
the_file = open(file_name)
data = the_file.read()
the_file.close()
except:
raise OSException('Error: Cannot open file name.')
self.change_directory('/')
self.change_directory('programs')
self.create_file(new_name)
self.open(new_name)
self.write(new_name, data)
self.save(new_name)
self.close(new_name)
def do_intinput(self, pcb, message, mem, using_int):
'''@raise OSException: because only can store in memory.'''
raise OSException("Error: Input - Only can store in memory.")
def set_priority(self, prior):
'''Setter of _priority.'''
if prior not in range(1, 11):
raise OSException('Error: Wrong process priority')
else:
self._priority = prior
def set_state(self, state):
'''Setter of _state.'''
if state not in ['New', 'Ready', 'Running', 'Waiting', 'Finished']:
raise OSException('Error: Wrong process state')
else:
self._state = state
def set_pc(self, pc):
'''Setter of _pc.'''
if pc > len(self.get_process().get_instructions()):
raise OSException('Error: Program Counter out of bounds')
else:
self._pc = pc
def get_write_data(self, pcb):
raise OSException("Error: I/O operation with CPU registers.")
def do_show(self, pcb, memory):
raise OSException("Error: I/O operation with CPU registers.")
