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# -*- coding: utf-8 -*-
"""
@file
@brief keep the status of a folder, assuming this folder is not moved
"""
import os
import datetime
from ..loghelper.flog import noLOG
from .file_info import convert_st_date_to_datetime, checksum_md5, FileInfo
class FilesStatus:
"""
This class maintains a list of files
and does some verifications in order to check if a file
was modified or not (if yes, then it will be updated to the website).
"""
def __init__(self, file, fLOG=noLOG):
"""
file which will contains the status
@param file file, if None, fill _children
@param fLOG logging function
"""
self._file = file
self.copyFiles = {}
self.fileKeep = file
self.LOG = fLOG
if os.path.exists(self.fileKeep):
with open(self.fileKeep, "r", encoding="utf8") as f:
for ni, _ in enumerate(f.readlines()):
if ni == 0 and _.startswith("\ufeff"):
_ = _[len("\ufeff"):]
spl = _.strip("\r\n ").split("\t")
try:
if len(spl) >= 2:
a, b = spl[:2]
obj = FileInfo(a, int(b), None, None, None)
if len(spl) > 2 and len(spl[2]) > 0:
obj.set_date(
convert_st_date_to_datetime(spl[2]))
if len(spl) > 3 and len(spl[3]) > 0:
obj.set_mdate(
convert_st_date_to_datetime(spl[3]))
if len(spl) > 4 and len(spl[4]) > 0:
obj.set_md5(spl[4])
self.copyFiles[a] = obj
else:
raise ValueError(
"expecting a filename and a date on this line: " + _)
except Exception as e:
raise Exception(
"issue with line:\n {0} -- {1}".format(_, spl)) from e
# contains all file to update
self.modifiedFile = {}
def __iter__(self):
"""
Iterates on all files stored in the current file,
yield a couple *(filename, FileInfo)*.
"""
for a, b in self.copyFiles.items():
yield a, b
def iter_modified(self):
"""
Iterates on all modified files yield a
couple *(filename, reason)*.
"""
for a, b in self.modifiedFile:
yield a, b
def save_dates(self, checkfile=None):
"""
Saves the status of the copy.
@param checkfile check the status for file checkfile
"""
typstr = str
if checkfile is None:
checkfile = []
rows = []
for k in sorted(self.copyFiles):
obj = self.copyFiles[k]
da = "" if obj.date is None else str(obj.date)
mda = "" if obj.mdate is None else str(obj.mdate)
sum5 = "" if obj.checksum is None else str(obj.checksum)
if k in checkfile and len(da) == 0:
raise ValueError(
"there should be a date for file " + k + "\n" + str(obj))
if k in checkfile and len(mda) == 0:
raise ValueError(
"there should be a mdate for file " + k + "\n" + str(obj))
if k in checkfile and len(sum5) <= 10:
raise ValueError(
"there should be a checksum( for file " + k + "\n" + str(obj))
values = [k, typstr(obj.size), da, mda, sum5]
sval = "%s\n" % "\t".join(values)
if "\tNone" in sval:
raise AssertionError(
"this case should happen " + sval + "\n" + str(obj))
rows.append(sval)
with open(self.fileKeep, "w", encoding="utf8") as f:
for r in rows:
f.write(r)
def has_been_modified_and_reason(self, file):
"""
Returns *(True, reason)* if a file was modified or *(False, None)* if not.
@param file filename
@return *(True, reason)* or *(False, None)*
"""
res = True
reason = None
typstr = str
if file not in self.copyFiles:
reason = "new"
res = True
else:
obj = self.copyFiles[file]
st = os.stat(file)
if st.st_size != obj.size:
reason = "size %s != old size %s" % (
str(st.st_size), typstr(obj.size))
res = True
else:
ld = obj.mdate
_m = st.st_mtime
d = convert_st_date_to_datetime(_m)
if d != ld:
# dates are different but files might be the same
if obj.checksum is not None:
ch = checksum_md5(file)
if ch != obj.checksum:
reason = "date/md5 %s != old date %s md5 %s != %s" % (
typstr(ld), typstr(d), obj.checksum, ch)
res = True
else:
res = False
else:
# it cannot know, it does nothing
res = False
else:
# mda.... no expected modification (dates did not change)
res = False
return res, reason
def add_modified_file(self, file, reason):
"""
Adds a file the modified list of files.
@param file file to add
@param reason reason for modification
"""
if file in self.modifiedFile:
raise KeyError("file {0} is already present".format(file))
self.modifiedFile[file] = reason
def add_if_modified(self, file):
"""
Adds a file to self.modifiedList if it was modified.
@param file filename
@return True or False
"""
res, reason = self.has_been_modified_and_reason(file)
if res:
self.add_modified_file(res, reason)
return res
def difference(self, files, u4=False, nlog=None):
"""
Goes through the list of files and tells which one has changed.
@param files @see cl FileTreeNode
@param u4 @see cl FileTreeNode (changes the output)
@param nlog if not None, print something every ``nlog`` processed files
@return iterator on files which changed
"""
memo = {}
if u4:
nb = 0
for file in files:
memo[file.fullname] = True
if file._file is None:
continue
nb += 1
if nlog is not None and nb % nlog == 0:
self.LOG("[FileTreeStatus], processed", nb, "files")
full = file.fullname
r, reason = self.has_been_modified_and_reason(full)
if r:
if reason == "new":
r = (">+", file._file, file, None)
yield r
else:
r = (">", file._file, file, None)
yield r
else:
r = ("==", file._file, file, None)
yield r
else:
nb = 0
for file in files:
memo[file.fullpath] = True
nb += 1
if nlog is not None and nb % nlog == 0:
self.LOG("[FileTreeStatus], processed", nb, "files")
full = file.fullname
if self.has_been_modified_and_reason(full):
yield file
for file in self.copyFiles.values():
if file.filename not in memo:
yield ("<+", file.filename, None, None)
def update_copied_file(self, file, delete=False):
"""
Updates the file in copyFiles (before saving), update all fields.
@param file filename
@param delete to remove this file
@return file object
"""
if delete:
if file not in self.copyFiles:
raise FileNotFoundError(
"unable to find a file in the list of monitored files: {0}".format(file))
del self.copyFiles[file]
return None
else:
st = os.stat(file)
size = st.st_size
mdate = convert_st_date_to_datetime(st.st_mtime)
date = datetime.datetime.now()
md = checksum_md5(file)
obj = FileInfo(file, size, date, mdate, md)
self.copyFiles[file] = obj
return obj
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