Oh, I wrote that from memory, looks like actually the workerfs usage needs to access the blob at mount time. Here is an example that does it: https://github.com/kripken/emscripten/blob/master/tests/fs/test_workerfs_package.cpp#L73 but the example usage doesn't interact with IndexedDB, looks like that kind of path does not exist. That example does an XHR as a blob and then mounts that blob into WORKERFS.
What you describe sounds ok. Btw, you may want to keep an eye out for the emscripten_fetch() API and ASMFS. Those should help with these types of use cases. (See the emscripten_fetch() thread on this mailing list) 2016-09-14 13:58 GMT+03:00 'Andras Kucsma' via emscripten-discuss < emscripten-discuss@googlegroups.com>: > Jukka, can you clarify where workerfs accesses IndexedDB? I can't find it. > > Our plan is to send XHRs with blob responseType and store them in workerfs. > > Based on the workerfs code, it seems to be ok to call WORKERFS.createNode > dynamically. Maybe existing files and directory management would need some > extra work. > > Do you see anything wrong with this approach (assuming workerfs is > extended to handle this appropriately)? > > Thanks, > András > > On Tue, Sep 13, 2016 at 8:57 PM, Jukka Jylänki <juj...@gmail.com> wrote: > >> It would be possible to add and remove files from WorkerFS, but both of >> those operations will require accessing IndexedDB, so neither of them will >> be synchronous operations. The deletion could be done in a fire and forget >> manner if one just assumes up front that the operation will always succeed. >> The addition could also be done in this manner, pretending that the async >> IndexedDB store will succeed, and assuming that the data for that file >> comes from a synchronous source and not based on an async XHR. Like you >> noted in 2. it is likely that bits are unimplemented so far, so this gets >> you to experimentation land. >> >> 2016-09-13 20:12 GMT+03:00 Alon Zakai <alonza...@gmail.com>: >> >>> I'm actually not sure, been a while since anyone worked on that code. I >>> remember the focus back then was just to see how useful sync reading (using >>> FileReaderSync, which is worker-only) is. Maybe the best thing is to just >>> try and see, the size of library_workerfs.js is fairly small so should be >>> easy to get into. FWIW my guess is adding new files/blobs could be possible. >>> >>> On Mon, Sep 12, 2016 at 9:50 AM, 'Andras Kucsma' via emscripten-discuss >>> <emscripten-discuss@googlegroups.com> wrote: >>> >>>> Hi, >>>> >>>> I have a couple of questions about the WORKERFS implementation: >>>> >>>> 1. Is it possible to add new files to the WORKERFS after mounting? >>>> (The documentation >>>> >>>> <https://kripken.github.io/emscripten-site/docs/api_reference/Filesystem-API.html#id2> >>>> suggests that only mount time, static file lists are supported, but it's >>>> not explicitly stated) >>>> Maybe I can call WORKERFS.createNode directly? >>>> >>>> 2. Lot of FS functions are not implemented in WORKERFS >>>> >>>> <https://github.com/kripken/emscripten/blob/c1e7ac6a5f4f38668a13b037747417e3ccbebf56/src/library_workerfs.js#L96-L119> >>>> . >>>> I'm particularly interested in is removing files (unlink). Is there >>>> any fundamental difficulty with doing that, or just simply no one got >>>> around to implement it yet? >>>> >>>> Thanks, >>>> András >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "emscripten-discuss" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to emscripten-discuss+unsubscr...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "emscripten-discuss" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to emscripten-discuss+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "emscripten-discuss" group. >> To unsubscribe from this topic, visit https://groups.google.com/d/to >> pic/emscripten-discuss/_gMBtDImb2Y/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> emscripten-discuss+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to emscripten-discuss+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to emscripten-discuss+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
