solara
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Published
20 hours ago •
widgetti
widgetti
ipycanvas doesn't work with solara
I want to develop an app that uses solara and ipycanvas, but it seems like ipycanvas isn't supported.
App code:
import solara
from ipycanvas import Canvas
@solara.component
def Page():
canvas = Canvas(width=200, height=200)
return canvas
Then, I start the app:
solara run app.py
And I get this error:
Traceback (most recent call last):
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/reacton/core.py", line 1675, in _render
root_element = el.component.f(*el.args, **el.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/eduardo/Desktop/jupyai-demos/app.py", line 58, in Page
canvas = RoughCanvas(width=width, height=height)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/ipycanvas/canvas.py", line 620, in __init__
super(Canvas, self).__init__(*args, **kwargs)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/ipywidgets/widgets/widget.py", line 506, in __init__
self.open()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/ipywidgets/widgets/widget.py", line 525, in open
state, buffer_paths, buffers = _remove_buffers(self.get_state())
^^^^^^^^^^^^^^^^
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/ipywidgets/widgets/widget.py", line 615, in get_state
value = to_json(getattr(self, k), self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/ipywidgets/widgets/widget.py", line 54, in _widget_to_json
return "IPY_MODEL_" + x.model_id
^^^^^^^^^^
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/server/patch.py", line 367, in model_id_debug
raise RuntimeError(f"Widget has been closed, the stacktrace when the widget was closed is:\n{closed_stack[id(self)]}")
RuntimeError: Widget has been closed, the stacktrace when the widget was closed is:
File "/Users/eduardo/miniconda3/envs/tmp/bin/solara", line 8, in <module>
sys.exit(main())
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/__main__.py", line 706, in main
cli()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/click/core.py", line 1157, in __call__
return self.main(*args, **kwargs)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/rich_click/rich_command.py", line 126, in main
rv = self.invoke(ctx)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/click/core.py", line 1688, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/click/core.py", line 1434, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/click/core.py", line 783, in invoke
return __callback(*args, **kwargs)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/__main__.py", line 428, in run
start_server()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/__main__.py", line 400, in start_server
server.run()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/uvicorn/server.py", line 61, in run
return asyncio.run(self.serve(sockets=sockets))
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/asyncio/runners.py", line 190, in run
return runner.run(main)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/asyncio/base_events.py", line 640, in run_until_complete
self.run_forever()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/asyncio/base_events.py", line 607, in run_forever
self._run_once()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/asyncio/base_events.py", line 1922, in _run_once
handle._run()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/asyncio/events.py", line 80, in _run
self._context.run(self._callback, *self._args)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/uvicorn/server.py", line 68, in serve
config.load()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/uvicorn/config.py", line 467, in load
self.loaded_app = import_from_string(self.app)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/uvicorn/importer.py", line 21, in import_from_string
module = importlib.import_module(module_str)
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1204, in _gcd_import
File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 940, in exec_module
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/server/starlette.py", line 47, in <module>
from . import app as appmod
File "<frozen importlib._bootstrap>", line 1232, in _handle_fromlist
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 940, in exec_module
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/server/app.py", line 407, in <module>
apps["__default__"] = AppScript(os.environ.get("SOLARA_APP", "solara.website.pages:Page"))
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/server/app.py", line 79, in __init__
dummy_kernel_context.close()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/server/kernel_context.py", line 92, in close
widgets.Widget.close_all()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/ipywidgets/widgets/widget.py", line 351, in close_all
widget.close()
File "/Users/eduardo/miniconda3/envs/tmp/lib/python3.11/site-packages/solara/server/patch.py", line 387, in close_widget_debug
stacktrace = "".join(traceback.format_stack())
Is this expected? Are there any workarounds?
Hi @edublancas!
It does seem like there are some issues with ipycanvas in solara. I'm using ipycanvas 0.12.1, since higher versions don't seem compatible at all.
There's a hidden example on using ipycanvas here... Although I checked and it doesn't seem to be working as is, so I'll be taking a look at fixing things.
Interestingly, this code
import solara
import ipycanvas
from reacton import ipycanvas as c
from reacton import ipywidgets as w
count = solara.reactive(0)
@solara.component
def Page():
solara.Button(f"Draw {count.value}", on_click=lambda: count.set(count.value + 1))
def draw():
print(canvas_element)
canvas = solara.get_widget(canvas_element)
print(canvas)
with ipycanvas.hold_canvas(canvas):
canvas.fill_style = "#63934e"
canvas.fill_rect(10 * count.value, 10 * count.value, 10, 10)
solara.use_effect(draw, [count.value])
canvas_element = c.Canvas(
width=700,
height=500,
)
print(canvas_element)
Page = Page()
Page
runs fine if you execute it through a notebook cell (solara run app.ipynb), but not if you run it as a standalone app.
awesome, thanks for looking at this!
in case it helps, there are some notes in the docs about why ipycanvas doesn't work out of the box in Voila (perhaps they're related to why they don't work on Solara?): https://ipycanvas.readthedocs.io/en/latest/advanced.html#ipycanvas-in-voila