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\r\n
一个简单的日志module, 功能如下\r\n

时间显示

调用log的文件名与行号显示

不同日志级别使用不同颜色输出

支持stdout输出的同时写入文件日志

文件日志使用缓存以降低io次数

\r\n
使用示例\r\n

var log = require('./log'),\r\n
\tlogWithoutFile = log.create();\r\n
\tlogWithFile = log.create(log.WARNING, 'my.log'),\r\n
\r\n
logWithoutFile.info('info msg');\r\n
logWithoutFile.debug('debug msg');\r\n
logWithoutFile.warning('warning msg');\r\n
logWithoutFile.error('error msg');\r\n
logWithoutFile.trace('trace msg');\r\n
\r\n
logWithFile.info('info msg');\r\n
logWithFile.debug('debug msg');\r\n
logWithFile.warning('warning msg');\r\n
logWithFile.error('error msg');\r\n
logWithFile.trace('trace msg');

\r\n
输出效果\r\n
\r\n
$\"cnode-log-demo\"$ \r\n
\r\n
源码如下\r\n

var fs = require('fs');\r\n
\r\n
var cwd = process.cwd() + '/',\r\n
\tINFO = 0;\r\n
\tDEBUG = 1;\r\n
\tWARNING = 2;\r\n
\tERROR = 3;\r\n
\tTRACE = 4;\r\n
\tINIT = 6;\r\n
\ttype = ['INFO', 'DEBUG', 'WARNING', 'ERROR', 'TRACE', '', 'LOG_INIT'];\r\n
\tcolors = [38, 34, 35, 31, 32, 36, 33];\r\n
\tbufferSize = 20000;\r\n
\twriteSize = 16384;\r\n
\r\n
exports.INFO = INFO;\r\n
exports.DEBUG = DEBUG;\r\n
exports.WARNING = WARNING;\r\n
exports.ERROR = ERROR;\r\n
exports.TRACE = TRACE;\r\n
\r\n
function getPos() {\r\n
\ttry {\r\n
\t\tthrow new Error();\r\n
\t} catch(e) {\r\n
\t\tvar pos = e.stack.split('\\n')[4].split('(')[1].split(')')[0].split(':');\r\n
\t\treturn pos[0].replace(cwd, '') + ':' + pos[1];\r\n
\t}\r\n
}\r\n
\r\n
function pad2(num) {\r\n
\treturn num > 9 ? num : '0' + num;\r\n
}\r\n
\r\n
function getTime() {\r\n
\tvar t = new Date();\r\n
\treturn [t.getFullYear(), '-', pad2(t.getMonth() + 1) , '-', pad2(t.getDate()), ' ',\r\n
\t\tpad2(t.getHours()), ':', pad2(t.getMinutes()), ':', pad2(t.getSeconds())].join('');\r\n
}\r\n
\r\n
function formatLog(log, color) {\r\n
\tvar tag = head = foot = '';\r\n
\tif (color) {\r\n
\t\thead = '\\x1B[';\r\n
\t\tfoot = '\\x1B[0m';\r\n
\t\ttag = colors[5]+'m';\r\n
\t\tcolor = colors[log.type]+'m';\r\n
\t}\r\n
\r\n
return [log.time, ' [', head, color, type[log.type], foot, '] [', head, tag, log.pos, foot, '] ', log.msg].join('');\r\n
}\r\n
\r\n
exports.create = function(level, file) {\r\n
\tif (!level) {\r\n
\t\tlevel = INFO;\r\n
\t}\r\n
\tif (file) {\r\n
\t\tvar buffer = new Buffer(bufferSize);\r\n
\t\tvar pos = 0;\r\n
\t\tvar fd = fs.openSync(file, 'a');\r\n
\t\tprocess.on('exit', function(){\r\n
\t\t\tfs.writeSync(fd, buffer, 0, pos, null);\r\n
\t\t})\r\n
\t}\r\n
\tfunction log(type, msg) {\r\n
\t\tif (type < level){\r\n
\t\t\treturn;\r\n
\t\t}\r\n
\t\tvar log = {type:type, msg:msg, time:getTime(), pos:getPos()};\r\n
\t\tconsole.log(formatLog(log, true));\r\n
\t\tif (file) {\r\n
\t\t\tif (pos >= writeSize) {\r\n
\t\t\t\tfs.writeSync(fd, buffer, 0, pos, null);\r\n
\t\t\t\tpos = 0;\r\n
\t\t\t}\r\n
\t\t\tpos += buffer.write(formatLog(log) + \"\\r\\n\", pos);\r\n
\t\t}\r\n
\t}\r\n
\tconsole.log(formatLog({type:INIT, pos:file, time:getTime(), msg: 'log init with level ' + type[level]}, true));\r\n
\treturn {\r\n
\t\tinfo : function(msg) {log(INFO, msg);},\r\n
\t\tdebug : function(msg) {log(DEBUG, msg);},\r\n
\t\twarning : function(msg) {log(WARNING, msg);},\r\n
\t\terror : function(msg) {log(ERROR, msg);},\r\n
\t\ttrace : function(msg) {log(TRACE, msg);},\r\n
\t};\r\n
}

","title","一个简单的日志module","last_reply_at","2013-04-20 16:16:37.068","good","top",12,"visit_count",8595,"2011-03-09 08:54:37","author",{"_13":54,"_22":55},"qingdu","http://www.gravatar.com/avatar/2e26ae3b35ec2d132acc318e7b3a4abb?s=48"]