如何使"winston"日志记录库像"console.log"一样工作? [英] How to make `winston` logging library work like `console.log`?

问题描述

winston 库非常适合传输和灵活性.我想使用它来配置级别并重定向到文件，但想重现console.log的行为以进行格式化，并遇到麻烦.

The winston library is great for transports and flexibility. I'd like to use it to allow configuring levels and redirecting to files, but would like to reproduce console.log behavior for formatting, and having trouble.

这是我到目前为止所拥有的:

Here's what I have so far:

const log = winston.createLogger({
  level: 'debug',
  format: format.combine(
    format.timestamp({format: 'YYYY-MM-DD HH:mm:ss.SSS'}),
    format.splat(),
    format.colorize(),
    format.printf(({level, message, label, timestamp}) => `${timestamp} ${label || '-'} ${level}: ${message}`),
  ),
  transports: [
    new winston.transports.Stream({
      stream: process.stderr,
      level: 'debug',
    })
  ],
});

log.info("Hello, %s", "Bob");   // Works: outputs "Hello, Bob"

但这不起作用:

log.info("Hello", "Bob");
log.info("Hello", 123, {someObj: 1});

我希望在 splat()占用的对象之后添加所有多余的对象，并以空格分隔并最好使用 util.inspect()转换为字符串代码>.

I'd like all extraneous objects after those taken up by splat() to get added on, space-separated, and converted to string preferably using util.inspect().

推荐答案

回答我自己的问题.问题出在 format.splat 上-纯util.format 提供了更简单，更预期的行为.用此 utilFormatter 替换 format.splat 可解决该问题:

Answering my own question. The issue is with format.splat -- pure util.format offers a simpler and more expected behavior. Replacing format.splat with this utilFormatter addresses the problem:

const util = require('util');

function transform(info, opts) {
  const args = info[Symbol.for('splat')];
  if (args) { info.message = util.format(info.message, ...args); }
  return info;
}

function utilFormatter() { return {transform}; }

然后我的问题中的示例如下所示:

The example from my question then looks like so:

const log = winston.createLogger({
  level: 'debug',
  format: format.combine(
    format.timestamp({format: 'YYYY-MM-DD HH:mm:ss.SSS'}),
    utilFormatter(),     // <-- this is what changed
    format.colorize(),
    format.printf(({level, message, label, timestamp}) => `${timestamp} ${label || '-'} ${level}: ${message}`),
  ),
  transports: [
    new winston.transports.Stream({
      stream: process.stderr,
      level: 'debug',
    })
  ],
});

log.info("Hello, %s", "Bob");          // Works: outputs "Hello, Bob"
log.info("Hello", "Bob");              // Works: outputs "Hello Bob"
log.info("Hello", 123, {someObj: 1});  // Works: outputs "Hello 123 { someObj: 1} "

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