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https://github.com/danieleteti/delphimvcframework.git
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82 lines
2.2 KiB
Lua
82 lines
2.2 KiB
Lua
---------------------------------------------------------------------------
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-- RollingFileAppender is a FileAppender that rolls over the logfile
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-- once it has reached a certain size limit. It also mantains a
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-- maximum number of log files.
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--
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-- @author Tiago Cesar Katcipis (tiagokatcipis@gmail.com)
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--
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-- @copyright 2004-2007 Kepler Project
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---------------------------------------------------------------------------
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require"logging"
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local function openFile(self)
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self.file = io.open(self.filename, "a")
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if not self.file then
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return nil, string.format("file `%s' could not be opened for writing", self.filename)
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end
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self.file:setvbuf ("line")
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return self.file
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end
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local rollOver = function (self)
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for i = self.maxIndex - 1, 1, -1 do
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-- files may not exist yet, lets ignore the possible errors.
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os.rename(self.filename.."."..i, self.filename.."."..i+1)
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end
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self.file:close()
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self.file = nil
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local _, msg = os.rename(self.filename, self.filename..".".."1")
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if msg then
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return nil, string.format("error %s on log rollover", msg)
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end
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return openFile(self)
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end
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local openRollingFileLogger = function (self)
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if not self.file then
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return openFile(self)
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end
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local filesize = self.file:seek("end", 0)
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if (filesize < self.maxSize) then
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return self.file
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end
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return rollOver(self)
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end
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function logging.rolling_file(filename, maxFileSize, maxBackupIndex, logPattern)
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if type(filename) ~= "string" then
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filename = "lualogging.log"
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end
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local obj = { filename = filename,
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maxSize = maxFileSize,
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maxIndex = maxBackupIndex or 1
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}
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return logging.new( function(self, level, message)
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local f, msg = openRollingFileLogger(obj)
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if not f then
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return nil, msg
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end
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local s = logging.prepareLogMsg(logPattern, os.date(), level, message)
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f:write(s)
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return true
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end
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)
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end
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