My company uses websockets for mobile apps and thus wants to save on bandwidth. As a result all websocket traffic is encoded using msgpack, but the current library cannot handle that - presumably because of Elm's lack of underlying support for binary data.
On Thursday, 28 July 2016 23:17:51 UTC+2, Daniel Bachler wrote: > > I'd love to see support for the File and ArrayBuffer Apis, and maybe > TypedArrays/DataViews as well. IMHO they are an important piece of the Web > Platform that is still missing in Elm. > > Evan suggested collecting concrete use cases to guide the design. I would > like this thread to be the starting point of this effort. I would like to > ask anyone who would also like this feature or who has substantial > experience using either Api to add use cases or comment here so that we can > try to define the user story for both apis. From there, we could decide > what we would like to see supported and what, if anything, we don't need > for now and suggest Elm Apis. > > I have two stories from a side project of mine. It is a slideshow editor > that allows the user to select photos and audio files from the local > system, uploads them to a web service, let's the user arrange and > manipulate photos and music and then share the result with others. For > this, I have two immediate use cases plus some more ideas: > > *Upload local files as binary blob to AWS S3* > > In my current, (hacky) version, I use the FileReader api (via simonH1000's > filereader library) to read the content of a file into an ArrayBuffer, > (represented as Json.Value in Elm) then use a modified version of elm-http > to upload the content of the ArrayBuffer to an S3 storage bucket. > > *Download mp3 files, decode them and play them back via the AudioApi* > > Currently I do this with my modified http library to download the mp3 file > into an arraybuffer, then pass the resulting arraybuffer through a port to > some native javascript that then uses the Audio Api to decode the mp3 file > into a playable audiobuffer. > > *Parsing or otherwise processing local text files. * > > For another project I would be interested in reading and parsing > Swagger/OpenAPI definition files and then providing a UI to compare rest > apis. Since the processing will be done on simple Strings, this would only > require FileReader support (specifically the readAsText method). This would > already work with the FileReader library as is (though that one is not > available on package.elm-lang.org because it contains native code and is > not whitelisted). > > *TypedArrays and DataViews* > > I haven't worked with these yet, but I can anticipate some cases that > would be interesting: > > *Parsing/manipulating of binary data via the ArrayBuffer api.* > > One case I personally would like to do with this, is to parse the Exif > header of the jpeg files the user loaded from the local file system. My > slideshow could then display metadata information without roundtripping to > the server. > > *Create geometry for WebGL in the form of Vertex Buffers* > > *Generating sound/music by writing raw audio samples* > > These could then be played back via the Web audio apis. > > > Please add your own ideas to this thread. Once we have compiled a list of > use cases, we can look at the JS Apis available under the Web Platform for > Files, ArrayBuffers, Typed Arrays etc. and think how these could be exposed > to Elm. > -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
