Emscripten support #3330
Emscripten support #3330
Conversation
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This is really interesting, thanks... I've taken a bit of a look at the ecosystem here, tho am going to need a bit more orientation... Would it make sense to document an example of how to write an HTML page that includes a Python REPL with httpx imported and available? |
>>> from js import fetch
>>> resp = await fetch("console.html")
>>> text = await resp.text()
>>> print(text[:100])
<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<meta
http-equiv="origin-tria |
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Ah yep, okay... |
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Okay, well this is neat. Open the pyodide console, then... >>> import micropip, ssl, js
>>> await micropip.install('httpx')
>>> import httpx
>>> class JSTransport(httpx.AsyncBaseTransport):
async def handle_async_request(self, request):
url = str(request.url)
options = {
'method': request.method,
'headers': dict(request.headers),
'body': await request.aread(),
}
fetch_response = await js.fetch(url, options)
status_code = fetch_response.status
headers = dict(fetch_response.headers)
buffer = await fetch_response.arrayBuffer()
content = buffer.to_bytes()
return httpx.Response(status_code=status_code, headers=headers, content=content)
>>> client = httpx.AsyncClient(transport=JSTransport())
>>> r = await client.get('https://cdn.jsdelivr.net/pyodide/v0.23.4/full/repodata.json')
>>> r
<Response [200 OK]>
>>> r.json()
{'info': {'arch': 'wasm32', 'platform': 'emscripten_3_1_32', 'version': '0.23.4', 'python': '3.11.2'}, 'packages': {'asciitree': {'n
ame': 'asciitree', 'version': '0.3.3', ... |
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Dealing with this incrementally, here’s some isolated PRs that I think we should address first…
(If anyone’s up for tackling these, currently ought to be against the |
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Thanks again for your work here @joemarshall.
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@tomchristie I put in the PR that makes import ssl optional now (#3385 ) I updated this PR so it follows on from that PR. How this PR works now is it moves |
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@tomchristie I updated this to follow the changes in master - I think #3385 is redundant now, as the ssl changes are minimal at this point. |
Summary
I added a discussion for this ages back but there's been no input, so I've written it (because I was contracted to do the work anyway, so I might as well contribute it upstream). This PR adds support for running in emscripten / webassembly platforms, where all network connections go via the browser.
Currently in progress, but tests okay locally, so I've opened this to check the CI changes, I've got to update docs also.
Checklist