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stacktrace.js
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227 lines (207 loc) · 8.51 KB
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(function(root, factory) {
'use strict';
// Universal Module Definition (UMD) to support AMD, CommonJS/Node.js, Rhino, and browsers.
/* istanbul ignore next */
if (typeof define === 'function' && define.amd) {
define('stacktrace', ['error-stack-parser', 'stack-generator', 'stacktrace-gps'], factory);
} else if (typeof exports === 'object') {
module.exports = factory(require('error-stack-parser'), require('stack-generator'), require('stacktrace-gps'));
} else {
root.StackTrace = factory(root.ErrorStackParser, root.StackGenerator, root.StackTraceGPS);
}
}(this, function StackTrace(ErrorStackParser, StackGenerator, StackTraceGPS) {
var _options = {
filter: function(stackframe) {
// Filter out stackframes for this library by default
return (stackframe.functionName || '').indexOf('StackTrace$$') === -1 &&
(stackframe.functionName || '').indexOf('ErrorStackParser$$') === -1 &&
(stackframe.functionName || '').indexOf('StackTraceGPS$$') === -1 &&
(stackframe.functionName || '').indexOf('StackGenerator$$') === -1;
},
sourceCache: {}
};
var _generateError = function StackTrace$$GenerateError() {
try {
// Error must be thrown to get stack in IE
throw new Error();
} catch (err) {
return err;
}
};
/**
* Merge 2 given Objects. If a conflict occurs the second object wins.
* Does not do deep merges.
*
* @param {Object} first base object
* @param {Object} second overrides
* @returns {Object} merged first and second
* @private
*/
function _merge(first, second) {
var target = {};
[first, second].forEach(function(obj) {
for (var prop in obj) {
if (Object.prototype.hasOwnProperty.call(obj, prop)) {
target[prop] = obj[prop];
}
}
return target;
});
return target;
}
function _isShapedLikeParsableError(err) {
return err.stack || err['opera#sourceloc'];
}
function _filtered(stackframes, filter) {
if (typeof filter === 'function') {
return stackframes.filter(filter);
}
return stackframes;
}
return {
/**
* Get a backtrace from invocation point.
*
* @param {Object} opts
* @returns {Array} of StackFrame
*/
get: function StackTrace$$get(opts) {
var err = _generateError();
return _isShapedLikeParsableError(err) ? this.fromError(err, opts) : this.generateArtificially(opts);
},
/**
* Get a backtrace from invocation point.
* IMPORTANT: Does not handle source maps or guess function names!
*
* @param {Object} opts
* @returns {Array} of StackFrame
*/
getSync: function StackTrace$$getSync(opts) {
opts = _merge(_options, opts);
var err = _generateError();
var stack = _isShapedLikeParsableError(err) ? ErrorStackParser.parse(err) : StackGenerator.backtrace(opts);
return _filtered(stack, opts.filter);
},
/**
* Given an error object, parse it.
*
* @param {Error} error object
* @param {Object} opts
* @returns {Promise} for Array[StackFrame}
*/
fromError: function StackTrace$$fromError(error, opts) {
opts = _merge(_options, opts);
var gps = new StackTraceGPS(opts);
return new Promise(function(resolve) {
var stackframes = _filtered(ErrorStackParser.parse(error), opts.filter);
resolve(Promise.all(stackframes.map(function(sf) {
return new Promise(function(resolve) {
function resolveOriginal() {
resolve(sf);
}
gps.pinpoint(sf).then(resolve, resolveOriginal)['catch'](resolveOriginal);
});
})));
}.bind(this));
},
/**
* Use StackGenerator to generate a backtrace.
*
* @param {Object} opts
* @returns {Promise} of Array[StackFrame]
*/
generateArtificially: function StackTrace$$generateArtificially(opts) {
opts = _merge(_options, opts);
var stackFrames = StackGenerator.backtrace(opts);
if (typeof opts.filter === 'function') {
stackFrames = stackFrames.filter(opts.filter);
}
return Promise.resolve(stackFrames);
},
/**
* Given a function, wrap it such that invocations trigger a callback that
* is called with a stack trace.
*
* @param {Function} fn to be instrumented
* @param {Function} callback function to call with a stack trace on invocation
* @param {Function} errback optional function to call with error if unable to get stack trace.
* @param {Object} thisArg optional context object (e.g. window)
*/
instrument: function StackTrace$$instrument(fn, callback, errback, thisArg) {
if (typeof fn !== 'function') {
throw new Error('Cannot instrument non-function object');
} else if (typeof fn.__stacktraceOriginalFn === 'function') {
// Already instrumented, return given Function
return fn;
}
var instrumented = function StackTrace$$instrumented() {
try {
this.get().then(callback, errback)['catch'](errback);
return fn.apply(thisArg || this, arguments);
} catch (e) {
if (_isShapedLikeParsableError(e)) {
this.fromError(e).then(callback, errback)['catch'](errback);
}
throw e;
}
}.bind(this);
instrumented.__stacktraceOriginalFn = fn;
return instrumented;
},
/**
* Given a function that has been instrumented,
* revert the function to it's original (non-instrumented) state.
*
* @param {Function} fn to de-instrument
*/
deinstrument: function StackTrace$$deinstrument(fn) {
if (typeof fn !== 'function') {
throw new Error('Cannot de-instrument non-function object');
} else if (typeof fn.__stacktraceOriginalFn === 'function') {
return fn.__stacktraceOriginalFn;
} else {
// Function not instrumented, return original
return fn;
}
},
/**
* Given an error message and Array of StackFrames, serialize and POST to given URL.
*
* @param {Array} stackframes
* @param {String} url
* @param {String} errorMsg
* @param {Object} requestOptions
*/
report: function StackTrace$$report(stackframes, url, errorMsg, requestOptions) {
return new Promise(function(resolve, reject) {
var req = new XMLHttpRequest();
req.onerror = reject;
req.onreadystatechange = function onreadystatechange() {
if (req.readyState === 4) {
if (req.status >= 200 && req.status < 400) {
resolve(req.responseText);
} else {
reject(new Error('POST to ' + url + ' failed with status: ' + req.status));
}
}
};
req.open('post', url);
// Set request headers
req.setRequestHeader('Content-Type', 'application/json');
if (requestOptions && typeof requestOptions.headers === 'object') {
var headers = requestOptions.headers;
for (var header in headers) {
if (Object.prototype.hasOwnProperty.call(headers, header)) {
req.setRequestHeader(header, headers[header]);
}
}
}
var reportPayload = {stack: stackframes};
if (errorMsg !== undefined && errorMsg !== null) {
reportPayload.message = errorMsg;
}
req.send(JSON.stringify(reportPayload));
});
}
};
}));
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