cartodb4/log4js-node
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got log rolling working, need to fix all the tests

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This commit is contained in:
Gareth Jones 2011-07-22 18:25:55 +10:00
parent 7aa076c278
commit 80474c6881
1 changed files with 88 additions and 43 deletions
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97
lib/log4js.js
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@ -286,52 +286,44 @@ function consoleAppender (layout) {
*/
function fileAppender (file, layout, logSize, numBackups, filePollInterval) {
layout = layout || layouts.basicLayout;
var logFile = fs.createWriteStream(file, { flags: 'a', mode: 0644, encoding: 'utf8' });
numBackups = numBackups || 5;
filePollInterval = filePollInterval * 1000 || 30000;
if (logSize > 0) {
setupLogRolling(logFile, file, logSize, numBackups || 5, (filePollInterval * 1000) || 30000);
}
//close the file on process exit.
process.on('exit', function() {
logFile.end();
});
return function(loggingEvent) {
logFile.write(layout(loggingEvent)+'\n');
};
}
function setupLogRolling (logFile, filename, logSize, numBackups, filePollInterval) {
function setupLogRolling () {
fs.watchFile(
filename,
file,
{
persistent: false,
interval: filePollInterval
},
function (curr, prev) {
if (curr.size >= logSize) {
rollThatLog(logFile, filename, numBackups);
rollThatLog();
}
}
);
}
function rollThatLog (logFile, filename, numBackups) {
//first close the current one.
logFile.end();
function rollThatLog () {
//roll the backups (rename file.n-1 to file.n, where n <= numBackups)
for (var i=numBackups; i > 0; i--) {
if (i > 1) {
if (fileExists(filename + '.' + (i-1))) {
fs.renameSync(filename+'.'+(i-1), filename+'.'+i);
if (fileExists(file + '.' + (i-1))) {
console.debug("Renaming " + file + '.' + (i-1) + ' -> ' + file + '.' + i);
fs.renameSync(file+'.'+(i-1), file+'.'+i);
}
} else {
fs.renameSync(filename, filename+'.1');
console.debug("Renaming " + file + " -> " + file + ".1");
fs.renameSync(file, file+'.1');
}
}
//open it up again
logFile = fs.createWriteStream(filename, { flags: 'a', mode: 0644, encoding: "utf8" });
//let's make a new file
var newLogFileFD = fs.openSync(file, 'a', 0644)
, oldLogFileFD = logFile.fd;
console.debug("made a new logFile ", newLogFileFD);
logFile.fd = newLogFileFD;
console.debug("closing old log file fd ", oldLogFileFD);
fs.close(oldLogFileFD);
}
function fileExists (filename) {
@ -343,6 +335,59 @@ function fileExists (filename) {
}
}
function openTheStream() {
console.debug("Creating the write Stream with file ", file);
var stream = fs.createWriteStream(file, { flags: 'a', mode: 0644, encoding: 'utf8' });
stream.on("open", function() {
canWrite = true;
console.debug("Stream is open, writing %d buffered events", logEventBuffer.length);
while (logEventBuffer.length > 0 && canWrite) {
canWrite = writeToLog(logEventBuffer.shift());
}
});
stream.on("error", function (err) {
console.error("Error happened ", err);
});
stream.on("drain", function() {
canWrite = true;
while (logEventBuffer.length > 0 && canWrite) {
canWrite = writeToLog(logEventBuffer.shift());
}
});
return stream;
}
var logEventBuffer = []
, canWrite = false
, logFile = openTheStream();
if (logSize > 0) {
setupLogRolling();
}
//close the file on process exit.
process.on('exit', function() {
console.debug("Buffer contains %d events", logEventBuffer.length);
logFile.end();
logFile.destroy();
});
function writeToLog(loggingEvent) {
return logFile.write(layout(loggingEvent)+'\n', "utf8");
}
return function(loggingEvent) {
//because the log stream is opened asynchronously, we don't want to write
//until it is ready.
if (canWrite) {
canWrite = writeToLog(loggingEvent);
} else {
logEventBuffer.push(loggingEvent);
}
};
}
function configure (configurationFileOrObject) {
var config = configurationFileOrObject;
if (typeof(config) === "string") {