lazy-common

Common libraries and utilities for lazy

LazyLoggingLevels

Using this object ensures consistent logging levels across all lazy processes running in Node.

Use:

const common = require('@getlazy/common');
const winston = require('winston');

winston.addColors(common.LazyLoggingLevels.colors);
const logger = new winston.Logger({
    // ...
    levels: common.LazyLoggingLevels.levels
});

PackageLogger

External packages cannot know if logger exists on the global level nor what are its levels. This replaces such logging efforts with emitting log events and leaving it to the package's user to listen to these events.

Use:

const common = require('@getlazy/common');
const logger = common.createLogger('my-package'); // We never assign this `logger` to `global` as that would overwrite application's `global.logger`.

// ...

logger.info('Succeeded marvelously.'); // This will emit `log` event. For users to listen to it logger needs to be exported from the package (see next example)

Forwarding log events:

const myPackage = require('my-package');
// This now forwards log events from my-package to Winston.
myPackage.logger.on('log', (level, packageName, ...args) => {
    // In this example we put the package name into meta, if such exists.
    const argsWithoutMeta = [...args];
    const meta = argsWithoutMeta.pop();
    if (typeof(meta) === 'object') { // Nah, not really, use lodash!
        if (!meta._packageName) {
            meta._packageName = packageName;
        }
    }
    logger.log(level, ...messages, meta);
})