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VS Code + Colab frontends, with kernel-side scene replay (#281) #293

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VS Code + Colab frontends, with kernel-side scene replay (#281) #293

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b6f9e17
feat: websocket-only frontend for VS Code-style notebook hosts (#281)
sspickle Aug 16, 2026
b4b1757
feat: comm-only frontend for Google Colab
sspickle Aug 16, 2026
32dae7b
fix: compound/text/extrusion/pause deadlock forever in Colab — raise …
sspickle Aug 16, 2026
a1dff68
fix: self-healing bootstrap — Colab sometimes drops mid-import display
sspickle Aug 16, 2026
51f6667
fix: retry comm-open from the kernel idle loop
sspickle Aug 16, 2026
f3029f1
fix: comm-open retries must not close previous attempts
sspickle Aug 16, 2026
3a2b741
feat: browser-initiated comm handshake for Colab (kernel target + com…
sspickle Aug 16, 2026
f3d621b
fix: session nonce freezes out zombie bootstrap frames
sspickle Aug 16, 2026
c9bc63a
fix: fallback opens carry the session nonce too
sspickle Aug 16, 2026
32e1647
fix: load the Colab bootstrap as an external CDN script
sspickle Aug 16, 2026
1fd6455
fix: drop the idle-loop comm retry — it made Colab drop display outputs
sspickle Aug 16, 2026
57298f4
fix: never display from import — Colab drops import-time display output
sspickle Aug 16, 2026
3dc277a
fix: self-heal displays the bootstrap once, not per unconnected cell
sspickle Aug 16, 2026
1a0501b
fix: show() injects the CDN bootstrap dynamically
sspickle Aug 16, 2026
c7d7b4b
feat: scene replay on every frontend attach
sspickle Aug 16, 2026
f299def
fix: cache-bust the evolving frontend files with the session nonce
sspickle Aug 16, 2026
dd5ca1a
fix: backfill the journal with cmds emitted before the frontend imported
sspickle Aug 17, 2026
ab0123d
fix: follow-up cmds (title/caption) must not clobber constructors in …
sspickle Aug 17, 2026
48b25c4
fix: journal copies constructors at replay time, not record time
sspickle Aug 17, 2026
8475feb
fix: replay cmds in original emission order (dim-scene bug)
sspickle Aug 17, 2026
d534f6b
feat: VPYTHON_WS_PORT pins the websocket port
sspickle Aug 17, 2026
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fix: show() injects the CDN bootstrap dynamically 
Colab strips script-src attributes in display HTML (and skips large
inline scripts), but a small inline script may insert external scripts
freely. Verified end-to-end live: render -> boot -> comms.open -> connect
-> flush (connected True, backlog flushed).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G7y9rTA1r8r8EhEnPSQenR
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@sspickle @claude
sspickle and claude committed Aug 16, 2026
commit 1a0501bc39866aa68e6d71aa813bb5d4099a684a
13 changes: 9 additions & 4 deletions vpython/with_colab.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,10 +93,15 @@ def show():
activate large inline scripts in display output — observed 2026-08 —
while script-src tags and one-liners run fine.)"""
display(HTML(
'<div id="vpython-colab-root"></div>'
'<script src="' + CDN_BASE + 'glowcomm_colab.js"></script>'
'<script>window.__VPYTHON_COLAB_BOOT({cdn: "' + CDN_BASE +
'", nonce: "' + SESSION_NONCE + '"});</script>'))
"<div id='vpython-colab-root'></div>"
"<script>(function(){"
"var s=document.createElement('script');"
"s.src='" + CDN_BASE + "glowcomm_colab.js';"
"s.onload=function(){window.__VPYTHON_COLAB_BOOT({cdn:'" + CDN_BASE +
"',nonce:'" + SESSION_NONCE + "'});};"
"s.onerror=function(){document.getElementById('vpython-colab-root')"
".textContent='VPython: failed to load bootstrap from CDN';};"
"document.head.appendChild(s);})();</script>"))


def _wire_comm(comm):
Expand Down