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'use strict'
const {
FST_ERR_LOG_LOGGER_AND_LOGGER_INSTANCE_PROVIDED,
FST_ERR_LOG_INVALID_LOGGER_CONFIG,
FST_ERR_LOG_INVALID_LOGGER_INSTANCE,
FST_ERR_LOG_INVALID_LOGGER
} = require('./errors')
/**
* Utility for creating a child logger with the appropriate bindings, logger factory
* and validation.
* @param {object} context
* @param {import('../fastify').FastifyBaseLogger} logger
* @param {import('../fastify').RawRequestDefaultExpression<any>} req
* @param {string} reqId
* @param {import('../types/logger.js').ChildLoggerOptions?} loggerOpts
*
* @returns {object} New logger instance, inheriting all parent bindings,
* with child bindings added.
*/
function createChildLogger (context, logger, req, reqId, loggerOpts) {
const loggerBindings = {
[context.requestIdLogLabel]: reqId
}
const child = context.childLoggerFactory.call(context.server, logger, loggerBindings, loggerOpts || {}, req)
// Optimization: bypass validation if the factory is our own default factory
if (context.childLoggerFactory !== defaultChildLoggerFactory) {
validateLogger(child, true) // throw if the child is not a valid logger
}
return child
}
/** Default factory to create child logger instance
*
* @param {import('../fastify.js').FastifyBaseLogger} logger
* @param {import('../types/logger.js').Bindings} bindings
* @param {import('../types/logger.js').ChildLoggerOptions} opts
*
* @returns {import('../types/logger.js').FastifyBaseLogger}
*/
function defaultChildLoggerFactory (logger, bindings, opts) {
return logger.child(bindings, opts)
}
/**
* Determines if a provided logger object meets the requirements
* of a Fastify compatible logger.
*
* @param {object} logger Object to validate.
* @param {boolean?} strict `true` if the object must be a logger (always throw if any methods missing)
*
* @returns {boolean} `true` when the logger meets the requirements.
*
* @throws {FST_ERR_LOG_INVALID_LOGGER} When the logger object is
* missing required methods.
*/
function validateLogger (logger, strict) {
const methods = ['info', 'error', 'debug', 'fatal', 'warn', 'trace', 'child']
const missingMethods = logger
? methods.filter(method => !logger[method] || typeof logger[method] !== 'function')
: methods
if (!missingMethods.length) {
return true
} else if ((missingMethods.length === methods.length) && !strict) {
return false
} else {
throw FST_ERR_LOG_INVALID_LOGGER(missingMethods.join(','))
}
}
function createLogger (options) {
if (options.logger && options.loggerInstance) {
throw new FST_ERR_LOG_LOGGER_AND_LOGGER_INSTANCE_PROVIDED()
}
if (!options.loggerInstance && !options.logger) {
const nullLogger = require('abstract-logging')
const logger = nullLogger
logger.child = () => logger
return { logger, hasLogger: false }
}
const { createPinoLogger, serializers } = require('./logger-pino.js')
// check if the logger instance has all required properties
if (validateLogger(options.loggerInstance)) {
const logger = createPinoLogger({
logger: options.loggerInstance,
serializers: Object.assign({}, serializers, options.loggerInstance.serializers)
})
return { logger, hasLogger: true }
}
// if a logger instance is passed to logger, throw an exception
if (validateLogger(options.logger)) {
throw FST_ERR_LOG_INVALID_LOGGER_CONFIG()
}
if (options.loggerInstance) {
throw FST_ERR_LOG_INVALID_LOGGER_INSTANCE()
}
const localLoggerOptions = {}
if (Object.prototype.toString.call(options.logger) === '[object Object]') {
Reflect.ownKeys(options.logger).forEach(prop => {
Object.defineProperty(localLoggerOptions, prop, {
value: options.logger[prop],
writable: true,
enumerable: true,
configurable: true
})
})
}
localLoggerOptions.level = localLoggerOptions.level || 'info'
localLoggerOptions.serializers = Object.assign({}, serializers, localLoggerOptions.serializers)
options.logger = localLoggerOptions
const logger = createPinoLogger(options.logger)
return { logger, hasLogger: true }
}
function now () {
const ts = process.hrtime()
return (ts[0] * 1e3) + (ts[1] / 1e6)
}
module.exports = {
createChildLogger,
defaultChildLoggerFactory,
createLogger,
validateLogger,
now
}