This is an excerpt from the test suite I'm developing for a REST signaling
component in my app. It creates two parallel connection offers, and then
checks that no wires get crossed when each offer gets answered.
To ensure that both offers are listening for answers when I send the first
answer, I'm awaiting the listen phase for both offers (using
mbostock/queue, aka 'queue-async' in npm) before I send the answers. The
async code path that the response to the answer goes down, which gets
initiated before the answers are posted, has to resolve *after* the
resolution of the awaited listening phase. I don't even know how I'd write
this with promises.
function timeyWimeyBall(endpoint, obody, cb) {
localPost(endpoint, obody, function(err, res, body) {
// This will be set a couple callbacks down
var expectedAnswer, finalCallback;
localGet(res.headers.location, receiveAnswer);
cb(err,function answerer(abody, fcb) {
expectedAnswer = abody; finalCallback = fcb;
localGet(endpoint,function(err,res,body){
localPost(res.headers.location, abody);
});
});
function receiveAnswer(err, res, body) {
assert(body == expectedAnswer);
finalCallback && finalCallback(err);
}
});
}
queue()
.defer(timeyWimeyBall, '/offers/point-a', 'Offer A initial body')
.defer(timeyWimeyBall, '/offers/point-b', 'Offer B initial body')
.await(function(err, answererA, answererB){
queue()
.defer(answererA,'Answer A initial body')
.defer(answererB,'Answer B initial body')
.await(done);
});
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