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fix: properly handle non-errors thrown in domains #1757

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merged 3 commits into from Mar 16, 2019
Merged

fix: properly handle non-errors thrown in domains #1757

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b953997
fix: properly handle non-errors thrown in domains
DonutEspresso Mar 13, 2019
714a1b6
fix: pr comments
DonutEspresso Mar 15, 2019
83900d7
fix: pr comments
DonutEspresso Mar 16, 2019
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13 changes: 9 additions & 4 deletions lib/server.js
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Expand Up @@ -1303,19 +1303,24 @@ Server.prototype._routeErrorResponse = function _routeErrorResponse(
return;
}

self._emitErrorEvents(req, res, null, err, function emitError(emitErr) {
self._emitErrorEvents(req, res, null, err, function emitError() {
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What happened to emitErr?

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I looked at _emitErrorEvents, and emitErr is actually the same object as err, just passed back. It seemed confusing as heck, so I removed it outright. In retrospect, I should probably remove calling this callback w/ err to begin with.

// Prevent double handling
if (res._sent) {
return;
}

// Expose only knonw errors
if (_.isNumber(err.statusCode)) {
// only automatically send errors that are known (e.g., restify-errors)
if (err instanceof Error && _.isNumber(err.statusCode)) {
res.send(err);
return;
}

res.send(new errors.InternalError(emitErr || err));
// if the thrown exception is not really an Error object, e.g.,
// "throw 'foo';"
// try to do best effort here to pass on that value by casting it to a
// string. This should work even for falsy values like 0, false, null,
// or undefined.
res.send(new errors.InternalError(String(err)));
});
};

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132 changes: 129 additions & 3 deletions test/server.test.js
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Expand Up @@ -2482,6 +2482,37 @@ test('uncaughtException should not trigger named routeHandler', function(t) {
});
});

test('uncaughtException should handle thrown null', function(t) {
SERVER.get(
{
name: 'foo',
path: '/foo'
},
function(req, res, next) {
throw null; //eslint-disable-line no-throw-literal
}
);

SERVER.get(
{
name: 'bar',
path: '/bar'
},
function(req, res, next) {
// This code should not run, but we can test against the status code
res.send(200);
next();
}
);

CLIENT.get('/foo', function(err, _, res, data) {
t.ok(err);
t.equal(res.statusCode, 500);
t.equal(data.message, 'null');
t.end();
});
});

test('uncaughtException should handle thrown undefined literal', function(t) {
SERVER.get(
{
Expand All @@ -2505,14 +2536,46 @@ test('uncaughtException should handle thrown undefined literal', function(t) {
}
);

CLIENT.get('/foo', function(err, _, res) {
CLIENT.get('/foo', function(err, _, res, data) {
t.ok(err);
t.equal(res.statusCode, 500);
t.equal(data.message, 'undefined');
t.end();
});
});

test('uncaughtException should handle thrown falsy number', function(t) {
SERVER.get(
{
name: 'foo',
path: '/foo'
},
function(req, res, next) {
throw 0; //eslint-disable-line no-throw-literal
}
);

SERVER.get(
{
name: 'bar',
path: '/bar'
},
function(req, res, next) {
// This code should not run, but we can test against the status code
res.send(200);
next();
}
);

CLIENT.get('/foo', function(err, _, res, data) {
t.ok(err);
t.equal(data.message, '0');
t.equal(res.statusCode, 500);
t.end();
});
});

test('uncaughtException should handle thrown Number', function(t) {
test('uncaughtException should handle thrown non falsy number', function(t) {
SERVER.get(
{
name: 'foo',
Expand All @@ -2535,8 +2598,71 @@ test('uncaughtException should handle thrown Number', function(t) {
}
);

CLIENT.get('/foo', function(err, _, res) {
CLIENT.get('/foo', function(err, _, res, data) {
t.ok(err);
t.equal(data.message, '1');
t.equal(res.statusCode, 500);
t.end();
});
});

test('uncaughtException should handle thrown boolean', function(t) {
SERVER.get(
{
name: 'foo',
path: '/foo'
},
function(req, res, next) {
throw true; //eslint-disable-line no-throw-literal
}
);

SERVER.get(
{
name: 'bar',
path: '/bar'
},
function(req, res, next) {
// This code should not run, but we can test against the status code
res.send(200);
next();
}
);

CLIENT.get('/foo', function(err, _, res, data) {
t.ok(err);
t.equal(data.message, 'true');
t.equal(res.statusCode, 500);
t.end();
});
});

test('uncaughtException should handle thrown falsy boolean', function(t) {
SERVER.get(
{
name: 'foo',
path: '/foo'
},
function(req, res, next) {
throw false; //eslint-disable-line no-throw-literal
}
);

SERVER.get(
{
name: 'bar',
path: '/bar'
},
function(req, res, next) {
// This code should not run, but we can test against the status code
res.send(200);
next();
}
);

CLIENT.get('/foo', function(err, _, res, data) {
t.ok(err);
t.equal(data.message, 'false');
t.equal(res.statusCode, 500);
t.end();
});
Expand Down