numpy not working in iframe context

[bcolloran]

@mdboom -- this is probably a no-op for now; i will supply additional details when the iframe branch is a bit further along

but for reference (and also for @hamilton) in the iframe-2 branch, when i load
http://localhost:8888/dev/iodide.editor.dev.html?url=https://iodide.io/pyodide-demo/data-club-demo-2018-05-29.html
and execute cell-by-cell, all the base python demo stuff works as expected, and when i run pyodide.loadPackage('numpy') i ge the expected "loaded numpy" message; but when i try to run the numpy sine wave cell, i get:

Error: Traceback (most recent call last):
  File "/lib/python3.6/site-packages/numpy/core/__init__.py", line 16, in <module>
    from . import multiarray
ImportError: Could not evaluate dynamic lib: /lib/python3.6/site-packages/numpy/core/multiarray.so
RangeError: WebAssembly.Compile is disallowed on the main thread, if the buffer size is larger than 4KB. Use WebAssembly.compile, or compile on a worker thread.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/lib/python3.6/site-packages/numpy/__init__.py", line 142, in <module>
    from . import add_newdocs
  File "/lib/python3.6/site-packages/numpy/add_newdocs.py", line 13, in <module>
    from numpy.lib import add_newdoc
  File "/lib/python3.6/site-packages/numpy/lib/__init__.py", line 8, in <module>
    from .type_check import *
  File "/lib/python3.6/site-packages/numpy/lib/type_check.py", line 11, in <module>
    import numpy.core.numeric as _nx
  File "/lib/python3.6/site-packages/numpy/core/__init__.py", line 26, in <module>
    raise ImportError(msg)
ImportError: 
Importing the multiarray numpy extension module failed.  Most
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control).  Otherwise reinstall numpy.

Original error was: Could not evaluate dynamic lib: /lib/python3.6/site-packages/numpy/core/multiarray.so
RangeError: WebAssembly.Compile is disallowed on the main thread, if the buffer size is larger than 4KB. Use WebAssembly.compile, or compile on a worker thread.


    at _hiwire_throw_error (https://iodide.io/pyodide-demo/pyodide.asm.js:4:34764)
    at wasm-function[330]:1321
    at wasm-function[333]:621
    at Object.Module.__runPython (https://iodide.io/pyodide-demo/pyodide.asm.js:4:1853747)
    at Object.Module.runPython (https://iodide.io/pyodide-demo/pyodide.asm.js:4:37861)
    at http://localhost:8888/dev/iodide.eval-frame.dev.js:13574:49
    at http://localhost:8888/dev/iodide.eval-frame.dev.js:79279:18
    at dispatch (http://localhost:8888/dev/iodide.eval-frame.dev.js:52298:18)
    at evaluationQueue.then (http://localhost:8888/dev/iodide.eval-frame.dev.js:13732:52)

no need to worry about this just yet, when i have a sharable link to that branch i'll update this thread (of course, you're always welcome to check out iframe-2 and poke around if you're curious, but it's still in rough shape for now)

[mdboom]

Is this on Chrome? If so, I think it's an instance of #28, and should be resolved by emscripten-core/emscripten#6663. If not Chrome, this is a new one for Firefox and must be iframe-specific, though it should hopefully be resolvable in the same way.

[mdboom]

Another data point: @hamilton sent me this simple notebook that does nothing but load another notebook in an iframe, and it does seem to work in that context:

https://iodide.io/master/?jsmd=%25%25%20meta%0A%7B%0A%20%20%22lastExport%22%3A%20%222018-06-20T00%3A56%3A26.782Z%22%0A%7D%0A%0A%25%25%20md%0A%3Ciframe%20src%3D%27https%3A%2F%2Fiodide.io%2Fmaster%2F%3Furl%3Dhttps%3A%2F%2Fiodide.io%2Fpyodide-demo%2Fdata-club-demo-2018-05-29.html%27%20width%3D800%20height%3D800%20%2F%3E%0A%0A%25%25%20js

[bcolloran]

ah! yes, tremendous -- i forgot we still had that chrome bug. Works in the iframe on FF. woot!