Support connecting to existing ipython session. #71
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Use cases:
- Start an ipython kernel on a server with lots of ram and cpu
and connect it to local lightweight machine running emacs.
- Ipython kernel launched by some tool. My team have a tool that
configures ipython session and configuration can't simply be
added to profile_default.
I considered passing additional argument, but simply naming session
with connection json is simple solution that works well.
I am running it in my emacs and it works. To test:
1. Start ipython session outside of org mode with:
import os
from ipykernel.kernelapp import IPKernelApp
app = IPKernelApp.instance()
app.initialize([])
kernel = app.kernel
kernel.shell.push({'print_me': 'Running in previously started kernel.'})
app.start()
2. Get json from previous command and name a session after your json
file. For example: #+BEGIN_SRC ipython :session kernel-8520.json
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@kozikow @gregsexton This PR looks interesting. One thing I don't understand though - @kozikow 's PR seems to just directly start an ipython kernel, then point ob-ipython at the resulting json connect file to link up emacs to the kernel. In this case, what happened to driver.py? Why do we no longer need it? If ob-ipython.el can just directly connect to a jupyter notebook over http, what's the role of the driver.py intermediary? |
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OK, I think I understand a little bit more. Starting a notebook server doesn't automatically start any kernels - so at the very least we need ob-ipython to start a kernel (if it's not connecting to a remote one). But why is driver.py implementing a Tornado web app to actually execute code - doesn't Jupyter provide this exact functionality? e.g., http://blog.ibmjstart.net/2016/01/28/jupyter-notebooks-as-restful-microservices/ Maybe driver.py was written before this feature was in jupyter notebook? |
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Long overdue merge. Thanks for the PR. |
3 participants
Use cases:
and connect it to local lightweight machine running emacs.
configures ipython session and configuration can't simply be
added to ~/.ipython/profile_default.
Simply naming session with connection json is simple solution that works well.
I considered additional parameter, "existing-session", but it would require much more code changes, as it would require passing one more argument in all tornado requests.
I am running it in my emacs and it works. To test:
import os
from ipykernel.kernelapp import IPKernelApp
app = IPKernelApp.instance()
app.initialize([])
kernel = app.kernel
kernel.shell.push({'print_me': 'Running in previously started kernel.'})
app.start()
2. Get json from previous command and name a session after your json file. For example:
+BEGIN_SRC ipython :session kernel-8520.json :results output
+END_SRC
+RESULTS:
: Running in previously started kernel.