Am Dienstag, 17. Dezember 2013 02:44:04 UTC+1 schrieb Stephen Bartell:
>
> On the writable end, I push a `JSON.stringify`d object.
> On the other reader end, can I expect `chunk` to be `JSON.parse` -able?
>
by the fast look into the code it looks like its normal behavior. but there
is no guaratees documented, so i wouldn't rely on that.
>
> When running the code below, it seems like it. Like, it works and I can't
> logically make sense of it. I would expect that if not in objectMode, the
> reader will need to buffer things until some sentinel pattern is found
> which will tell me it's safe to call JSON.parse.
>
> Could someone shed some light on why this works and if I can rely on this
> in practice?
>
the buffering happens by pushing the chunk as is to an array (used as
queue). so the chunks in your example are just like as you push them in the
queue. so everytime your transform reads from the readable it gets the same
chunk as before (not exactly, it gets the buffer made from it). as i said,
there is no gurantee, that it will stay like this, since it's not
documented.
Plus if you make this asumtion, your consume stream is less robust nd less
reusable. you couldnt plug your transform in a pipeline, where it gets json
data from http or tcp source.
>
> ```
> var Readable = require('stream').Readable;
> var Transform = require('stream').Transform
>
> printer = new Transform()
> printer._transform = function (chunk, enc, next) {
> console.log(JSON.parse(chunk)) // <- safe to assume I can JSON.parse
> this?
> this.push(chunk)
> next()
> }
>
> var rs = new Readable
> rs.push(JSON.stringify({foo: 'bar'}))
> rs.push(JSON.stringify({foo: 'bar'}))
> rs.push(JSON.stringify({foo: 'bar'}))
> rs.push(null)
>
> rs.pipe(printer)
>
> ```
>
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