gistfile1.js

//////////////////////////////////////////////
// REDUCTION: http://gist.github.com/553200
//////////////////////////////////////////////

// Somehow we've managed to push the right buttons causing Node to get
// into a broken state. After hitting our web server anywhere from
// 5-5000 times JSON.stringify begins to produce corrupt output. Where
// the ascii chars 'null' should appear for null values,
// JSON.stringify instead emits these 4 bytes: \002\000\000\000
//
// The bug occurs with Node v0.1.101 up till v0.2.0, on Mac OS X
// 10.6.4 (amd64) and Ubuntu 10.04 (x86). We can't reproduce it on
// v0.1.100.
//
// Until we can isolate a test case NodeMachine[1] is one variable in
// the equation. We haven't been able to rule it out as a factor in
// triggering the bug.
//
// [1] http://github.com/tautologistics/nodemachine

function jsonResponse(code, object) {
    var status,
	body = '',
	headers = {'content-length': 0},
        wrappedObject;

    if (typeof object === 'number')
        status = code >= 200 && code < 300 ? 'ok' : 'fail';
    else {
        status = code;
        code = object ? 200 : 204;
    }

    if (object) {
        if (Array.isArray(object))
            wrappedObject = {status: status, data: object};
        else
            wrappedObject = mergeObjects({status: status}, object);
	body = JSON.stringify(wrappedObject);
        // This if block detects corruption in the resulting JSON
        if (body.match(/\000/)) {
            console.log('JSON.stringify is producing corrupt data!')
            var body2 = JSON.stringify(wrappedObject);
            if (body2.match(/\000/)) {
                console.log('JSON.stringify definitely corrupting data')
            } else {
                console.log('this else branch is never taken')
            }
        }
	headers['content-length'] = body.length;
	headers['content-type'] = 'application/json';
    }
    return [code, headers, body];
};

function updateObject(target, source) {
    for (key in source) {
        if (source.hasOwnProperty(key)) {
            target[key] = source[key];
        }
    }
    return target;
}
function mergeObjects(a, b) {
    var obj = updateObject({}, a);
    return updateObject(obj, b);
}