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A proof-of-concept serialization, transmission and restoring python runtime

Project description

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pyteleport

A proof-of-concept serialization, transmission and restoring python runtime.

How it works

  • You invoke teleport in your python script.
  • pyteleport collects the runtime state: globals, locals, stack.
  • pyteleport dumps the runtime into a specially designed "morph" bytecode which resumes from where teleport was invoked.
  • The bytecode is transmitted to the target environment and passed to a python interpreter there.
  • The local python runtime is terminated and simply pipes stdio from the target environment.

Example

from flow_control import bash_teleport
from socket import gethostname
from os import getpid

def log(*args):
    print(f"[{gethostname()}/{getpid()}]", *args)

log("hi")
bash_teleport("ssh", "cartesius",
    "conda activate py39;",
    other_fn=("mem_view.py", "flow_control.py"))
log("bye")

outputs

[stealth/4258] hi
[int1.bullx/17980] bye

Note that the two outputs were produced by different processes on different machines! This is what bash_teleport does: it transmits the runtime from one python process to another.

Also works from within a stack:

def a():
    def b():
        def c():
            result = "hello"
            bash_teleport("ssh", "cartesius",
                "conda activate py39;",
                other_fn=("mem_view.py", "flow_control.py"))
            return result + " world"
        return len(c()) + float("3.5")
    return 5 * (3 + b())
assert a() == 87.5

Known limitations

This is a proof of concept. It currently works only within specific conditions and with specific cPython versions.

This does not work with:

  • non-python stacks (i.e. when native code invokes python);
  • active generators in stack;
  • for, try, if, with, and all other subframes;

More information to be added.

History

  • 8 July 2021 21:32 CEST a python runtime was first teleported to another process on the same machine
  • 11 July 2021 20:46 CEST a python runtime was first teleported to another machine

License

LICENSE.md

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