Thanks! It seems to get tricky if there are iterations that may not
necessarily callback. I tried a workaround by calling done before push
data. This works as long as there are more than one chunks, but has
problems if there is only one chunk is received.
_transform = function(chunk,encoding,done) {
var that = this;
myTransform(chunk,function(data) {
that.push(data);
}
done();
}
One workaround is to simply use a stack of done functions, and them call
them all once some data is retrieved.
On Tuesday, March 4, 2014 1:55:09 PM UTC-8, Timothy J Fontaine wrote:
>
> You can push as many times in the _transform stream as you like, including
> 0, and you can set an interval that comes back later and pushes, or you can
> opt to wait until _flush is called and then push.
>
> If you're implementing a protocol parser and may need multiple chunks then
> you just consume the data, and then not push until you have enough data to
> act upon, and then push.
>
> In other words it doesn't need to be a 1:1 map of _transform to .push, but
> there does need to be a 1:1 map of _transform to done callbacks
>
>
> On Tue, Mar 4, 2014 at 1:05 PM, Jeremy Hubble
> <[email protected]<javascript:>
> > wrote:
>
>> Use case is an external service that may need more than one chunk of data
>> to perform its operation.
>>
>> An analogy would be in some unix commands.
>>
>> For example:
>> cat file.txt | grep someLongString
>>
>> In node, we get chunks at a time and need to return the result.
>>
>> Jeremy
>>
>>
>>
>>
>> On Tuesday, March 4, 2014 12:33:40 PM UTC-8, mscdex wrote:
>>>
>>> On Tuesday, March 4, 2014 2:45:11 PM UTC-5, Jeremy Hubble wrote:
>>>>
>>>> Is there a way to construct a transform pipe such that it can receive
>>>> multiple chunks before calling everything back?
>>>>
>>>>
>>> What's the use case?
>>>
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