Keep same file name for log and rotate the file with timestamp

[singaselvasankar]

logger.txt

I'm using [email protected] and [email protected]
In my logger configuration I have the following.

var transportError = new (winston.transports.DailyRotateFile)({
  filename: HOME_DIR + '/logs/backend/error/error-%DATE%.log',
  datePattern: 'YYYY-MM-DD-HH',
  zippedArchive: false,
  maxSize: '50m',
  maxFiles: '14d',
  level: 'error',
  name: 'error',

  createSymlink: true,
  symlinkName: 'error.log',
  tailable: true,

  handleExceptions: true,
  json: true,
  colorize: false,
});

this is supposed to be like current log file should be error.log and when rotates it should get append with date format

even though I have mentioned createSymlink, tailable set to true symlinkName with 'error.log'
my current log files are like this error-2021-02-01-13.log, error-2021-02-01-12.log

[mattberther]

This is correct - and you should see a symlink in the /logs/backend/error folder called error.log, which is a symlink to the current log file. Please reopen with additional detail if you find this to not be the case.

[singaselvasankar]

Hi @mattberther thanks, but I am not seeing error.log in /logs/backend/error. Could you tell me how do I get additional details for you in this case. I'm using windows machine.

[mattberther]

Below is a shell session showing that this should work. Can you try this simple program on your system and let us know what happens?

~/projects/github.com/winston-daily-rotate-file master
❯ git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean

~/projects/github.com/winston-daily-rotate-file master
❯ cat test.js
var winston = require('winston');
var randomString = require('./test/random-string');
require('./index');

const transport = new (winston.transports.DailyRotateFile)({
    level: 'info',
    filename: 'logs/application-%DATE%.log',
    datePattern: 'YYYY-MM-DD',
    zippedArchive: false,
    maxSize: '1k',
    maxFiles: '14d',
    level: 'error',
    name: 'error',

    createSymlink: true,
    symlinkName: 'error.log',

    handleExceptions: true,
    json: true,
    colorize: false,
});


const logger = winston.createLogger({
    level: 'info',
    format: winston.format.combine(
        winston.format.timestamp({
            format: 'DD-MM-YYYY-hh-MM',
        }),
        winston.format.printf((info) => {
            return `${info.timestamp} ${info.level} ${info.message}`;
        })),
    transports: [
        transport,
    ],
});

logger.error(randomString(2048))
logger.error("This is expected in the info transport")

~/projects/github.com/winston-daily-rotate-file master
❯ rm -rf logs && node test.js && ls -al logs
total 24
drwxr-xr-x   6 matt  staff   192 Feb  2 19:36 .
drwxr-xr-x  20 matt  staff   640 Feb  2 19:36 ..
-rw-r--r--   1 matt  staff   498 Feb  2 19:36 .a28f20db971a7c5f03cc3cf0d21bff08893fc8f3-audit.json
-rw-r--r--   1 matt  staff  2072 Feb  2 19:36 application-2021-02-02.log
-rw-r--r--   1 matt  staff    62 Feb  2 19:36 application-2021-02-02.log.1
lrwxr-xr-x   1 matt  staff    28 Feb  2 19:36 error.log -> application-2021-02-02.log.1

~/projects/github.com/winston-daily-rotate-file master
❯

[singaselvasankar]

@mattberther as you suggested ran the simple program, got the following in logs. I don't see error.log
Used the simple program you posted above
in both the log files I see the message one in random string and another one the message provided in the js

 Directory of D:\winston-daily-rotate-file\logs

02/03/2021  02:12 PM    <DIR>          .
02/03/2021  02:12 PM    <DIR>          ..
02/03/2021  02:12 PM               501 .a28f20db971a7c5f03cc3cf0d21bff08893fc8f3-audit.json
02/03/2021  02:12 PM             2,073 application-2021-02-03.log
02/03/2021  02:12 PM                63 application-2021-02-03.log.1
               3 File(s)          2,637 bytes
               2 Dir(s)  14,822,420,480 bytes free

[mattberther]

From your project's root folder, what is the output of npm view file-stream-rotator version?

Further, it seems as though creating symlinks on Windows requires admin permissions (see nodejs/node#18518 (comment)). Let me know if that solves the issue, and if so, I'll submit a PR against the file-stream-rotator component to add the required option to bypass this.

[singaselvasankar]

Checked in project's root folder file-stream-rotator version is 0.5.7
Ran the sample application with admin privilege, still no file as error.log

[jalbiero]

I don't understand the symlink options. Why not have the current file without any date/number and just apply them after a rotation? That's what I need and what I had used in other languages. IMHO the mentioned options over-complicate the usage.

[hezhongfeng]

same what I want.

[Darshilp326]

@singaselvasankar Where you able to solve this issue?

[singaselvasankar]

@singaselvasankar Where you able to solve this issue?

No @Darshilp326 I couldn't, but symlink is working as expected in my Linux system

[mohsenmahoski]

I don't understand the symlink options. Why not have the current file without any date/number and just apply them after a rotation? That's what I need and what I had used in other languages. IMHO the mentioned options over-complicate the usage.

I don't want to config my elastic search to watch the file with pattern. I thing its very important to have the current file without any pattern

[DaCao]

This answer here worked very well for me: #310 (comment)

I think you are missing the dirname: './logs', line. Below is what worked in my app:

const transportDailyRotate: DailyRotateFile = new DailyRotateFile({
  filename: 'logs/application-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  maxSize: '20m',
  maxFiles: '30d',
  dirname: './logs',
  createSymlink: true,
  symlinkName: 'all.log',
  format: format_string,
});

const transports = [
  new winston.transports.Console(options.conosle),
  new winston.transports.File(options.error_logfile),
  transportDailyRotate,
];

const Logger = winston.createLogger({
  level: level(),
  levels,
  defaultMeta: { service: 'myapp', host: os.hostname() },
  transports,
});

and in the ./logs folder:

-rw-rw-r-- 1 ubuntu ubuntu 5047 Dec  2 01:59 application-2022-12-02.log
drwxrwxr-x 2 ubuntu ubuntu 4096 Dec  2 01:52 .
lrwxrwxrwx 1 ubuntu ubuntu   26 Dec  2 01:52 all.log -> application-2022-12-02.log
-rw-rw-r-- 1 ubuntu ubuntu    0 Dec  2 01:52 error.log

I think this issue can be closed.