Aren't simple-stream's still a bit problematic if you pass them around like
values? Because multiple readers would still interfere with each other
wouldn't they?
On Tuesday, August 13, 2013 4:05:02 AM UTC+12, Eldar wrote:
>
> If you want to create some function which accepts a stream and can affect
> it's state you should be able to destroy the given stream on demand
> e.g. when something went wrong and/or you are not interested in receiving
> data anymore.
> Unfortunately that's impossible with current node readable streams because
> they:
>
> 1. Support multiple consumers
> 2. Don't have common cleanup interface
>
> So you can't touch another's stream because someone else may use it
> and if you could you don't know how.
>
> The absence of ability to pass streams as arguments is a huge flow. You can
> build almost nothing
> without that. Now someone may wonder: but there are so many useful modules
> about streams in npm!?
> Right. They all rely on `.pipe()`. For some reason all kind of blog posts,
> tutorials and even node's
> own documentation teach that for passing readable you can do
> `readable.pipe(writable)`.
> E.g. http file server could be:
>
> ```javascript
> var http = require('http')
> var fs = require('fs')
> http.createServer(function(req, res) {
> res.writeHead(200, {'Content-Type': 'text/plain'})
> fs.createReadStream(req.url.slice(1)).pipe(res)
> }).listen(3000)
> ```
>
> That's a lie. Exactly for the reasons above `.pipe()` doesn't cleanup any
> resources.
> Everything works fine until the streaming process completes successfully.
> But if something fails you get horrible leaks and hangs.
> Almost every module doing stream processing have this flow. Obvious or not.
>
> That all is sad. We need another, simpler API. Although I believe
> incompatible changes should be made
> to node core that is not what I am calling about (at least not at the first
> place).
> But we definitely should stop to expose node streams in userland modules,
> stop to extend "stream base classes", just stop to use it in userland.
>
> Now the constructive part. Tim Caswell proposed recently simple-stream
> <https://github.com/creationix/js-git/blob/master/specs/simple-stream.md> and
> build many things on top of it.
>
> Let's just peek this API as a standard and start using it.
> Here is readable-to-simple-stream <https://github.com/eldargab/stream-simple>
> converter which can be used for dealing with node core.
>
> It also contains slightly more detailed version of original spec which could
> be discussed.
>
> That's it.
>
>
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