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index.js
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index.js
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'use strict'
var fs = require('fs')
var path = require('path')
var asyncCache = require('async-cache')
var afterAll = require('after-all-results')
var errorCallsites = require('error-callsites')
var loadSourceMap = require('load-source-map')
var debug = require('debug')('stackman')
var LINES_OF_CONTEXT = 5
var ESCAPED_REGEX_PATH_SEP = path.sep === '/' ? '/' : '\\\\'
var MODULE_FOLDER_REGEX = new RegExp('.*node_modules' + ESCAPED_REGEX_PATH_SEP + '([^' + ESCAPED_REGEX_PATH_SEP + ']*)')
module.exports = function stackman (opts) {
if (!opts) opts = {}
var fileCache = asyncCache({
max: opts.fileCacheMax || 500,
load: function (file, cb) {
debug('reading %s', file)
fs.readFile(file, { encoding: 'utf8' }, function (err, data) {
if (err) return cb(err)
cb(null, data.split(/\r?\n/))
})
}
})
var sourceMapCache = asyncCache({
max: opts.sourceMapCacheMax || 100,
load: function (file, cb) {
debug('loading source map for %s', file)
loadSourceMap(file, cb)
}
})
return {
callsites: callsites,
properties: properties,
sourceContexts: sourceContexts
}
function callsites (err, opts, cb) {
if (typeof opts === 'function') return callsites(err, null, opts)
var _callsites = errorCallsites(err)
if (!validStack(_callsites)) {
var _err = new Error('Could not process callsites')
process.nextTick(function () {
cb(_err)
})
} else if (!opts || opts.sourcemap !== false) {
sourcemapify(_callsites, function (err) {
if (err) {
debug('error processing source map: %s', err.message)
}
_callsites.forEach(extendCallsite)
cb(null, _callsites)
})
} else {
_callsites.forEach(extendCallsite)
process.nextTick(function () {
cb(null, _callsites)
})
}
}
function properties (err) {
var properties = {}
Object.keys(err).forEach(function (key) {
if (key === 'stack') return // 'stack' seems to be enumerable in Node 0.11
var val = err[key]
if (val === null) return // null is typeof object and well break the switch below
switch (typeof val) {
case 'function':
return
case 'object':
// ignore all objects except Dates
if (typeof val.toISOString !== 'function') return
val = val.toISOString()
}
properties[key] = val
})
return properties
}
function sourceContexts (callsites, opts, cb) {
if (typeof opts === 'function') return sourceContexts(callsites, null, opts)
if (!opts) opts = {}
opts.inAppLines = opts.inAppLines >= 0 ? opts.inAppLines : (opts.lines || LINES_OF_CONTEXT)
opts.libraryLines = opts.libraryLines >= 0 ? opts.libraryLines : (opts.lines || LINES_OF_CONTEXT)
var next = afterAll(cb)
callsites.forEach(function (callsite) {
var lines = callsite.isApp() ? opts.inAppLines : opts.libraryLines
if (lines > 0 && !callsite.isNode()) {
callsite.sourceContext(lines, next())
} else {
next()(null, null)
}
})
}
function validStack (callsites) {
return Array.isArray(callsites) &&
typeof callsites[0] === 'object' &&
typeof callsites[0].getFileName === 'function'
}
function getRelativeFileName () {
var filename = this.getFileName()
if (!filename) return
var root = process.cwd()
if (root[root.length - 1] !== path.sep) root += path.sep
return !~filename.indexOf(root) ? filename : filename.substr(root.length)
}
function getTypeNameSafely () {
try {
return this.getTypeName()
} catch (e) {
// This seems to happen sometimes when using 'use strict',
// stemming from `getTypeName`.
// [TypeError: Cannot read property 'constructor' of undefined]
return null
}
}
function getFunctionNameSanitized () {
var fnName = this.getFunctionName()
if (fnName) return fnName
var typeName = this.getTypeNameSafely()
if (typeName) return typeName + '.' + (this.getMethodName() || '<anonymous>')
return '<anonymous>'
}
function getModuleName () {
var filename = this.getFileName() || ''
var match = filename.match(MODULE_FOLDER_REGEX)
return match ? match[1] : null
}
function isApp () {
return !this.isNode() && !~(this.getFileName() || '').indexOf('node_modules' + path.sep)
}
function isModule () {
return !!~(this.getFileName() || '').indexOf('node_modules' + path.sep)
}
function isNode () {
if (this.isNative()) return true
var filename = this.getFileName() || ''
return (!path.isAbsolute(filename) && filename[0] !== '.')
}
function sourceContext (linesOfContext, cb) {
var _err
if (typeof linesOfContext === 'function') {
cb = linesOfContext
linesOfContext = LINES_OF_CONTEXT
}
if (linesOfContext <= 0) {
_err = new Error('Cannot collect less than one line of source context')
process.nextTick(function () {
cb(_err)
})
return
}
if (this.isNode()) {
_err = new Error('Can\'t get source context of a Node core callsite')
process.nextTick(function () {
cb(_err)
})
return
}
var callsite = this
var filename = this.getFileName() || ''
var source = this.sourcemap
? this.sourcemap.sourceContentFor(filename, true)
: null
if (source) {
process.nextTick(function () {
cb(null, parseSource(source, callsite, linesOfContext))
})
} else {
fileCache.get(filename, function (err, lines) {
if (err) {
debug('error reading %s: %s', filename, err.message)
cb(err)
} else {
cb(null, parseSource(lines, callsite, linesOfContext))
}
})
}
}
function parseSource (lines, callsite, linesOfContext) {
var index = callsite.getLineNumber() - 1
var preLinesOfContext = Math.ceil((linesOfContext - 1) / 2)
var postLinesOfContext = Math.floor((linesOfContext - 1) / 2)
return {
pre: lines.slice(Math.max(0, index - preLinesOfContext), index),
line: lines[index],
post: lines.slice(index + 1, index + 1 + postLinesOfContext)
}
}
function sourcemapify (callsites, cb) {
var next = afterAll(function (err, consumers) {
if (err) return cb(err)
consumers.forEach(function (consumer, index) {
if (!consumer) return
Object.defineProperty(callsites[index], 'sourcemap', {
writable: true,
value: consumer
})
})
cb()
})
callsites.forEach(function (callsite) {
getSourceMapConsumer(callsite, next())
})
}
function getSourceMapConsumer (callsite, cb) {
if (isNode.call(callsite)) return process.nextTick(cb)
var filename = callsite.getFileName()
sourceMapCache.get(filename, cb)
}
function extendCallsite (callsite) {
var getLineNumber = callsite.getLineNumber
var getColumnNumber = callsite.getColumnNumber
var getFileName = callsite.getFileName
var position = null
var properties = {
getRelativeFileName: {
writable: true,
value: getRelativeFileName
},
getTypeNameSafely: {
writable: true,
value: getTypeNameSafely
},
getFunctionNameSanitized: {
writable: true,
value: getFunctionNameSanitized
},
getModuleName: {
writable: true,
value: getModuleName
},
isApp: {
writable: true,
value: isApp
},
isModule: {
writable: true,
value: isModule
},
isNode: {
writable: true,
value: isNode
},
sourceContext: {
writable: true,
value: sourceContext
}
}
if (callsite.sourcemap) {
properties.getFileName = {
writable: true,
value: function () {
var filename = getFileName.call(callsite)
var sourceFile = getPosition().source
if (!sourceFile) return filename
var sourceDir = path.dirname(filename)
return path.resolve(path.join(sourceDir, sourceFile))
}
}
properties.getLineNumber = {
writable: true,
value: function () {
return getPosition().line || getLineNumber.call(callsite)
}
}
properties.getColumnNumber = {
writable: true,
value: function () {
return getPosition().column || getColumnNumber.call(callsite)
}
}
}
Object.defineProperties(callsite, properties)
function getPosition () {
if (!position) {
try {
position = callsite.sourcemap.originalPositionFor({
line: getLineNumber.call(callsite),
column: getColumnNumber.call(callsite)
})
} catch (e) {
debug('error fetching source map position: %s', e.message)
return {}
}
}
return position
}
}
}