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logfile.py
# -*- test-case-name: twisted.test.test_logfile -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ A rotating, browsable log file. """ # System Imports import glob import os import stat import time from typing import BinaryIO, Optional, cast from twisted.python import threadable class BaseLogFile: """ The base class for a log file that can be rotated. """ synchronized = ["write", "rotate"] def __init__( self, name: str, directory: str, defaultMode: Optional[int] = None ) -> None: """ Create a log file. @param name: name of the file @param directory: directory holding the file @param defaultMode: permissions used to create the file. Default to current permissions of the file if the file exists. """ self.directory = directory self.name = name self.path = os.path.join(directory, name) if defaultMode is None and os.path.exists(self.path): self.defaultMode: Optional[int] = stat.S_IMODE( os.stat(self.path)[stat.ST_MODE] ) else: self.defaultMode = defaultMode self._openFile() @classmethod def fromFullPath(cls, filename, *args, **kwargs): """ Construct a log file from a full file path. """ logPath = os.path.abspath(filename) return cls(os.path.basename(logPath), os.path.dirname(logPath), *args, **kwargs) def shouldRotate(self): """ Override with a method to that returns true if the log should be rotated. """ raise NotImplementedError def _openFile(self): """ Open the log file. The log file is always opened in binary mode. """ self.closed = False if os.path.exists(self.path): self._file = cast(BinaryIO, open(self.path, "rb+", 0)) self._file.seek(0, 2) else: if self.defaultMode is not None: # Set the lowest permissions oldUmask = os.umask(0o777) try: self._file = cast(BinaryIO, open(self.path, "wb+", 0)) finally: os.umask(oldUmask) else: self._file = cast(BinaryIO, open(self.path, "wb+", 0)) if self.defaultMode is not None: try: os.chmod(self.path, self.defaultMode) except OSError: # Probably /dev/null or something? pass def write(self, data): """ Write some data to the file. @param data: The data to write. Text will be encoded as UTF-8. @type data: L{bytes} or L{unicode} """ if self.shouldRotate(): self.flush() self.rotate() if isinstance(data, str): data = data.encode("utf8") self._file.write(data) def flush(self): """ Flush the file. """ self._file.flush() def close(self): """ Close the file. The file cannot be used once it has been closed. """ self.closed = True self._file.close() del self._file def reopen(self): """ Reopen the log file. This is mainly useful if you use an external log rotation tool, which moves under your feet. Note that on Windows you probably need a specific API to rename the file, as it's not supported to simply use os.rename, for example. """ self.close() self._openFile() def getCurrentLog(self): """ Return a LogReader for the current log file. """ return LogReader(self.path) class LogFile(BaseLogFile): """ A log file that can be rotated. A rotateLength of None disables automatic log rotation. """ def __init__( self, name, directory, rotateLength=1000000, defaultMode=None, maxRotatedFiles=None, ): """ Create a log file rotating on length. @param name: file name. @type name: C{str} @param directory: path of the log file. @type directory: C{str} @param rotateLength: size of the log file where it rotates. Default to 1M. @type rotateLength: C{int} @param defaultMode: mode used to create the file. @type defaultMode: C{int} @param maxRotatedFiles: if not None, max number of log files the class creates. Warning: it removes all log files above this number. @type maxRotatedFiles: C{int} """ BaseLogFile.__init__(self, name, directory, defaultMode) self.rotateLength = rotateLength self.maxRotatedFiles = maxRotatedFiles def _openFile(self): BaseLogFile._openFile(self) self.size = self._file.tell() def shouldRotate(self): """ Rotate when the log file size is larger than rotateLength. """ return self.rotateLength and self.size >= self.rotateLength def getLog(self, identifier): """ Given an integer, return a LogReader for an old log file. """ filename = "%s.%d" % (self.path, identifier) if not os.path.exists(filename): raise ValueError("no such logfile exists") return LogReader(filename) def write(self, data): """ Write some data to the file. """ BaseLogFile.write(self, data) self.size += len(data) def rotate(self): """ Rotate the file and create a new one. If it's not possible to open new logfile, this will fail silently, and continue logging to old logfile. """ if not (os.access(self.directory, os.W_OK) and os.access(self.path, os.W_OK)): return logs = self.listLogs() logs.reverse() for i in logs: if self.maxRotatedFiles is not None and i >= self.maxRotatedFiles: os.remove("%s.%d" % (self.path, i)) else: os.rename("%s.%d" % (self.path, i), "%s.%d" % (self.path, i + 1)) self._file.close() os.rename(self.path, "%s.1" % self.path) self._openFile() def listLogs(self): """ Return sorted list of integers - the old logs' identifiers. """ result = [] for name in glob.glob("%s.*" % self.path): try: counter = int(name.split(".")[-1]) if counter: result.append(counter) except ValueError: pass result.sort() return result def __getstate__(self): state = BaseLogFile.__getstate__(self) del state["size"] return state threadable.synchronize(LogFile) class DailyLogFile(BaseLogFile): """A log file that is rotated daily (at or after midnight localtime)""" def _openFile(self): BaseLogFile._openFile(self) self.lastDate = self.toDate(os.stat(self.path)[8]) def shouldRotate(self): """Rotate when the date has changed since last write""" return self.toDate() > self.lastDate def toDate(self, *args): """Convert a unixtime to (year, month, day) localtime tuple, or return the current (year, month, day) localtime tuple. This function primarily exists so you may overload it with gmtime, or some cruft to make unit testing possible. """ # primarily so this can be unit tested easily return time.localtime(*args)[:3] def suffix(self, tupledate): """Return the suffix given a (year, month, day) tuple or unixtime""" try: return "_".join(map(str, tupledate)) except BaseException: # try taking a float unixtime return "_".join(map(str, self.toDate(tupledate))) def getLog(self, identifier): """Given a unix time, return a LogReader for an old log file.""" if self.toDate(identifier) == self.lastDate: return self.getCurrentLog() filename = f"{self.path}.{self.suffix(identifier)}" if not os.path.exists(filename): raise ValueError("no such logfile exists") return LogReader(filename) def write(self, data): """Write some data to the log file""" BaseLogFile.write(self, data) # Guard against a corner case where time.time() # could potentially run backwards to yesterday. # Primarily due to network time. self.lastDate = max(self.lastDate, self.toDate()) def rotate(self): """Rotate the file and create a new one. If it's not possible to open new logfile, this will fail silently, and continue logging to old logfile. """ if not (os.access(self.directory, os.W_OK) and os.access(self.path, os.W_OK)): return newpath = f"{self.path}.{self.suffix(self.lastDate)}" if os.path.exists(newpath): return self._file.close() os.rename(self.path, newpath) self._openFile() def __getstate__(self): state = BaseLogFile.__getstate__(self) del state["lastDate"] return state threadable.synchronize(DailyLogFile) class LogReader: """Read from a log file.""" def __init__(self, name): """ Open the log file for reading. The comments about binary-mode for L{BaseLogFile._openFile} also apply here. """ self._file = open(name) # Optional[BinaryIO] def readLines(self, lines=10): """Read a list of lines from the log file. This doesn't returns all of the files lines - call it multiple times. """ result = [] for i in range(lines): line = self._file.readline() if not line: break result.append(line) return result def close(self): self._file.close()
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