# -*- test-case-name: twisted.test.test_logfile -*- # Copyright (c) 2001-2004 Twisted Matrix Laboratories. # See LICENSE for details. """ A rotating, browsable log file. """ # System Imports import os, glob, string, time # sibling imports import threadable class BaseLogFile: """The base class for a log file that can be rotated. """ synchronized = ["write", "rotate"] def __init__(self, name, directory, defaultMode=None): self.directory = directory assert os.path.isdir(self.directory) self.name = name self.path = os.path.join(directory, name) if defaultMode is None and os.path.exists(self.path) and hasattr(os, "chmod"): self.defaultMode = os.stat(self.path)[0] else: self.defaultMode = defaultMode self._openFile() 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.""" self.closed = 0 if os.path.exists(self.path): self._file = open(self.path, "r+", 1) self._file.seek(0, 2) else: self._file = open(self.path, "w+", 1) # set umask to be same as original log file if self.defaultMode is not None: try: os.chmod(self.path, self.defaultMode) except OSError: # Probably /dev/null or something? pass def __getstate__(self): state = self.__dict__.copy() del state["_file"] return state def __setstate__(self, state): self.__dict__ = state self._openFile() def write(self, data): """Write some data to the file.""" if self.shouldRotate(): self.flush() self.rotate() 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 = 1 self._file.close() self._file = None 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): BaseLogFile.__init__(self, name, directory, defaultMode) self.rotateLength = rotateLength 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: 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(string.split(name, '.')[-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: # 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 = "%s.%s" % (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 = "%s.%s" % (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): self._file = open(name, "r") 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()