this works, here is the final version, thanks:
exports.get_list = function (cb) {
rclient.smembers("list", function (err, members) {
var len = members.length
members.forEach(function (member) {
console.log(member)
rclient.hgetall(member, function (err, item) {
console.log(item)
len --
if (len === 0)
cb(null, 'lst')
})
})
})
}
On Mar 20, 9:03 pm, Oliver Leics <oliver.le...@gmail.com> wrote:
> > since forEach is a synchronous as you pointed out, cb got called at
> > end of the loop, that's what I was expecting, but when every iteration
> > also calls an asynchronous callback, that will be different as those
> > asynchronous calls in fact happens after the cb(null, 'lst'), how to
> > deal with this kind of situation?
>
> Get the definite number of comming items:
>
> exports.get_list = function (cb) {
> rclient.smembers("list", function(err, members) {
> if(err) { return cb(err) }
> if(members.length==0) return cb(null, 'lst');
> members.forEach(function(member){
> console.log(member)
>
> var pending = rclient.hnumall(member);
> if(!pending) cb(null, 'lst')
>
> rclient.hgetall(member, function(err, item) {
> if(err) { return cb(err) }
> console.log(item)
> if(!(--pending)) cb(null, 'lst')
> })
> })
> })
>
> }
>
> Or use an second callback on rclient.hgetall and call it at the end of
> iteration:
>
> rclient.hgetall(member, cb, cbDone)
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