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const chalk = require('chalk')
const isStream = require('is-stream')
/**
* Development style logger middleware for Mali.
* @module @malijs/logger
*
* @param {Object} options Options
* @param {Boolean} options.fullName To log full name from context, otherwise logs just the name.
* Default: <code>false</code>
* @param {Boolean | Function} options.timestamp Enables or disables the inclusion of a timestamp in the log message.
* If a function is supplied, it is passed a `Date` timestamp and it must synchronously return the string representation to be logged.
* There are predefined timestamp functions: `epochTime` (default), `epochTime`, and `isoTime`.
* @param {Boolean | Function} options.request Enables or disables the inclusion of request in the log message.
* By default `JSON.stringify` is used. If a function is supplied it is passed the request from the context.
* @param {Boolean | Function} options.response Enables or disables the inclusion of response in the log message.
* By default `JSON.stringify` is used. If a function is supplied it is passed the response from the context.
*
* @example
* const logger = require('@malijs/logger')
* app.use(logger())
*
* @example <caption>With timestamp</catoin>
* const logger = require('@malijs/logger')
* app.use(logger({timestamp: true}))
*
* @example <caption>With custom predefined timestamp</catoin>
* const logger = require('@malijs/logger')
* app.use(logger({timestamp: logger.isoTime}))
*
* @example <caption>With custom timestamp function</catoin>
* const logger = require('@malijs/logger')
* app.use(logger({ timestamp: date => `${date.toDateString()} ${date.toLocaleTimeString()}` }))
*/
function logger (options = {}) {
if (typeof options.fullName !== 'boolean') {
options.fullName = false
}
if (options.timestamp === true) {
options.timestamp = epochTime
} else if (typeof options.timestamp !== 'function') {
options.timestamp = false
}
if (options.request === true) {
options.request = JSON.stringify
} else if (typeof options.request !== 'function') {
options.request = false
}
if (options.response === true) {
options.response = JSON.stringify
} else if (typeof options.response !== 'function') {
options.response = false
}
return function logger (ctx, next) {
const start = new Date()
const timestamp = options.timestamp ? ` ${options.timestamp(start)}` : ''
const request = options.request ? ` ${options.request(ctx.req)}` : ''
console
.log(
` ${chalk.gray('-->')} ${chalk.bold('%s')}%s ${chalk.gray('%s')}`,
timestamp,
options.fullName ? ctx.fullName : ctx.name,
request,
ctx.type
)
return next().then(() => {
if (!isStream(ctx.res) || (ctx.type !== 'response_stream' && ctx.type !== 'duplex')) {
return log(options, ctx, start, null, null)
}
const res = ctx.res
const onfinish = done.bind(null, 'finish')
const onclose = done.bind(null, 'close')
const onend = done.bind(null, 'end')
res.once('finish', onfinish)
res.once('close', onclose)
res.once('end', onend)
function done (event) {
res.removeListener('finish', onfinish)
res.removeListener('close', onclose)
res.removeListener('end', onend)
log(options, ctx, start, null, event)
}
}, (err) => {
log(options, ctx, start, err)
throw err
})
}
}
/**
* Milliseconds since Unix epoch (Default)
*/
const epochTime = date => `${date.getTime()}`
/**
* Seconds since Unix epoch
*/
const unixTime = date => `${Math.round(date.getTime() / 1000.0)}`
/**
* Timestamp in ISO time.
*/
const isoTime = date => `${date.toISOString()}`
logger.epochTime = epochTime
logger.unixTime = unixTime
logger.isoTime = isoTime
function log (options, ctx, start, err, event) {
const color = err ? 'red' : 'green'
const timestamp = options.timestamp ? options.timestamp(start) : ''
const response = options.response ? options.response(ctx.res) : ''
const upstream = err ? chalk.red('<--')
: event === 'close' ? chalk.yellow('-x-')
: chalk.gray('<--')
console.log(' ' + upstream +
chalk.cyan('%s') +
' ' + chalk.bold('%s') +
'%s' +
' ' + chalk.gray('%s') +
' ' + chalk[color]('%s'),
timestamp ? ` ${timestamp}` : '',
options.fullName ? ctx.fullName : ctx.name,
response ? ` ${response}` : '',
ctx.type,
time(start))
}
function time (start) {
const delta = new Date() - start
return humanizeNumber(delta < 10000
? delta + 'ms'
: Math.round(delta / 1000) + 's')
}
module.exports = logger
|