koa-log4
Version:
log4js-node support Koa-middleware
221 lines (202 loc) • 7.32 kB
JavaScript
const co = require('co')
const levels = require('log4js').levels
const DEFAULT_FORMAT = ':remote-addr - -' +
' ":method :url HTTP/:http-version"' +
' :status :content-length ":referrer"' +
' ":user-agent"'
/**
* Log requests with the given `options` or a `format` string.
* Use for Koa v1
*
* Options:
*
* - `format` Format string, see below for tokens
* - `level` A log4js levels instance. Supports also 'auto'
*
* Tokens:
*
* - `:req[header]` ex: `:req[Accept]`
* - `:res[header]` ex: `:res[Content-Length]`
* - `:http-version`
* - `:response-time`
* - `:remote-addr`
* - `:date`
* - `:method`
* - `:url`
* - `:referrer`
* - `:user-agent`
* - `:status`
*
* @param {String|Function|Object} format or options
* @return {Function}
* @api public
*/
function getKoaLogger (logger4js, options) {
if (typeof options == 'object') {
options = options || {}
} else if (options) {
options = { format: options }
} else {
options = {}
}
var thislogger = logger4js
var level = levels.toLevel(options.level, levels.INFO)
var fmt = options.format || DEFAULT_FORMAT
var nolog = options.nolog ? createNoLogCondition(options.nolog) : null
return co.wrap(function *(ctx, next) {
// mount safety
if (ctx.request._logging) return yield next()
// nologs
if (nolog && nolog.test(ctx.originalUrl)) return yield next()
if (thislogger.isLevelEnabled(level) || options.level === 'auto') {
var start = new Date()
var writeHead = ctx.response.writeHead
// flag as logging
ctx.request._logging = true
// proxy for statusCode.
ctx.response.writeHead = function (code, headers) {
ctx.response.writeHead = writeHead
ctx.response.writeHead(code, headers)
ctx.response.__statusCode = code
ctx.response.__headers = headers || {}
// status code response level handling
if (options.level === 'auto') {
level = levels.INFO
if (code >= 300) level = levels.WARN
if (code >= 400) level = levels.ERROR
} else {
level = levels.toLevel(options.level, levels.INFO)
}
}
yield next()
// hook on end request to emit the log entry of the HTTP request.
ctx.response.responseTime = new Date() - start
// status code response level handling
if (ctx.res.statusCode && options.level === 'auto') {
level = levels.INFO
if (ctx.res.statusCode >= 300) level = levels.WARN
if (ctx.res.statusCode >= 400) level = levels.ERROR
}
if (thislogger.isLevelEnabled(level)) {
var combined_tokens = assemble_tokens(ctx, options.tokens || [])
if (typeof fmt === 'function') {
var line = fmt(ctx, function (str) {
return format(str, combined_tokens)
})
if (line) thislogger.log(level, line)
} else {
thislogger.log(level, format(fmt, combined_tokens))
}
}
} else {
// ensure next gets always called
yield next()
}
})
}
/**
* Adds custom {token, replacement} objects to defaults, overwriting the defaults if any tokens clash
*
* @param {Koa Context} ctx
* @param {Array} custom_tokens [{ token: string-or-regexp, replacement: string-or-replace-function }]
* @return {Array}
*/
function assemble_tokens (ctx, custom_tokens) {
var array_unique_tokens = function (array) {
let a = array.concat()
for (let i = 0; i < a.length; ++i) {
for (let j = i + 1; j < a.length; ++j) {
if (a[i].token == a[j].token) { // not === because token can be regexp object
a.splice(j--, 1)
}
}
}
return a
}
var default_tokens = []
default_tokens.push({ token: ':url', replacement: ctx.originalUrl })
default_tokens.push({ token: ':protocol', replacement: ctx.protocol })
default_tokens.push({ token: ':hostname', replacement: ctx.hostname })
default_tokens.push({ token: ':method', replacement: ctx.method })
default_tokens.push({ token: ':status', replacement: ctx.response.status ||
ctx.response.__statusCode || ctx.res.statusCode })
default_tokens.push({ token: ':response-time', replacement: ctx.response.responseTime })
default_tokens.push({ token: ':date', replacement: new Date().toUTCString() })
default_tokens.push({ token: ':referrer', replacement: ctx.headers.referer || '' })
default_tokens.push({ token: ':http-version', replacement: ctx.req.httpVersionMajor + '.' + ctx.req.httpVersionMinor })
default_tokens.push({ token: ':remote-addr', replacement: ctx.headers['x-forwarded-for'] || ctx.ip || ctx.ips ||
(ctx.socket && (ctx.socket.remoteAddress || (ctx.socket.socket && ctx.socket.socket.remoteAddress))) })
default_tokens.push({ token: ':user-agent', replacement: ctx.headers['user-agent'] })
default_tokens.push({ token: ':content-length', replacement: (ctx.response._headers && ctx.response._headers['content-length']) ||
(ctx.response.__headers && ctx.response.__headers['Content-Length']) ||
ctx.response.length || '-' })
default_tokens.push({ token: /:req\[([^\]]+)\]/g, replacement: function (_, field) {
return ctx.headers[field.toLowerCase()]
} })
default_tokens.push({ token: /:res\[([^\]]+)\]/g, replacement: function (_, field) {
return ctx.response._headers
? (ctx.response._headers[field.toLowerCase()] || ctx.response.__headers[field])
: (ctx.response.__headers && ctx.response.__headers[field])
} })
return array_unique_tokens(custom_tokens.concat(default_tokens))
};
/**
* Return formatted log line.
*
* @param {String} str
* @param {IncomingMessage} req
* @param {ServerResponse} res
* @return {String}
* @api private
*/
function format (str, tokens) {
for (let i = 0; i < tokens.length; i++) {
str = str.replace(tokens[i].token, tokens[i].replacement)
}
return str
}
/**
* Return RegExp Object about nolog
*
* @param {String} nolog
* @return {RegExp}
* @api private
*
* syntax
* 1. String
* 1.1 "\\.gif"
* NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.gif?fuga
* LOGGING http://example.com/hoge.agif
* 1.2 in "\\.gif|\\.jpg$"
* NOT LOGGING http://example.com/hoge.gif and
* http://example.com/hoge.gif?fuga and http://example.com/hoge.jpg?fuga
* LOGGING http://example.com/hoge.agif,
* http://example.com/hoge.ajpg and http://example.com/hoge.jpg?hoge
* 1.3 in "\\.(gif|jpe?g|png)$"
* NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.jpeg
* LOGGING http://example.com/hoge.gif?uid=2 and http://example.com/hoge.jpg?pid=3
* 2. RegExp
* 2.1 in /\.(gif|jpe?g|png)$/
* SAME AS 1.3
* 3. Array
* 3.1 ["\\.jpg$", "\\.png", "\\.gif"]
* SAME AS "\\.jpg|\\.png|\\.gif"
*/
function createNoLogCondition (nolog) {
var regexp = null
if (nolog) {
if (nolog instanceof RegExp) {
regexp = nolog
}
if (typeof nolog === 'string') {
regexp = new RegExp(nolog)
}
if (Array.isArray(nolog)) {
var regexpsAsStrings = nolog.map((o) => (o.source ? o.source : o))
regexp = new RegExp(regexpsAsStrings.join('|'))
}
}
return regexp
}
module.exports = getKoaLogger