127 lines
2.9 KiB
JavaScript
127 lines
2.9 KiB
JavaScript
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var stringify = require('json-stringify-safe')
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, format = require('util').format
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, is = require('core-util-is')
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, individual = require('individual')('$$bole', { })
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, levels = 'debug info warn error'.split(' ')
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, hostname = require('os').hostname()
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, pid = process.pid
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function stackToString (e) {
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var s = e.stack
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, ce
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if (is.isFunction(e.cause) && (ce = e.cause()))
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s += '\nCaused by: ' + stackToString(ce)
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return s
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}
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function levelLogger (level, name) {
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return function (inp) {
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var outputs = individual[level]
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if (!outputs)
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return // no outputs for this level
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var out = {
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time : new Date().toISOString()
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, hostname : hostname
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, pid : pid
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, level : level
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, name : name
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}
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, k
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, i = 0
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, stringified
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if (is.isError(inp)) {
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if (arguments.length > 1)
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out.message = format.apply(null, Array.prototype.slice.call(arguments, 1))
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out.err = {
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name : inp.name
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, message : inp.message
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, code : inp.code // perhaps
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, stack : stackToString(inp)
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}
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} else if (is.isObject(inp) && inp.method && inp.url && inp.headers && inp.socket) {
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if (arguments.length > 1)
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out.message = format.apply(null, Array.prototype.slice.call(arguments, 1))
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out.req = {
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method : inp.method
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, url : inp.url
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, headers : inp.headers
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, remoteAddress : inp.connection.remoteAddress
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, remotePort : inp.connection.remotePort
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}
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} else if (is.isObject(inp)) {
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if (arguments.length > 1)
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out.message = format.apply(null, Array.prototype.slice.call(arguments, 1))
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for (k in inp) {
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if (Object.prototype.hasOwnProperty.call(inp, k))
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out[k] = inp[k]
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}
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} else if (!is.isUndefined(inp)) {
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out.message = format.apply(null, arguments)
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}
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for (; i < outputs.length; i++) {
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if (outputs[i]._writableState && outputs[i]._writableState.objectMode === true) {
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outputs[i].write(out)
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} else {
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if (!stringified) // lazy stringify
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stringified = stringify(out) + '\n'
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outputs[i].write(stringified)
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}
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}
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}
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}
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function bole (name) {
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function boleLogger (subname) {
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return bole(name + ':' + subname)
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}
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function makeLogger (p, level) {
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p[level] = levelLogger(level, name)
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return p
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}
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return levels.reduce(makeLogger, boleLogger)
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}
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bole.output = function (opt) {
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if (Array.isArray(opt))
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return opt.forEach(bole.output)
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var i = 0
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, b = false
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for (; i < levels.length; i++) {
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if (levels[i] === opt.level)
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b = true
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if (b) {
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if (!individual[levels[i]])
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individual[levels[i]] = []
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individual[levels[i]].push(opt.stream)
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}
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}
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}
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bole.reset = function () {
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for (var k in individual)
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delete individual[k]
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}
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module.exports = bole
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