forked from goodboy/tractor
37 lines
2.0 KiB
ReStructuredText
37 lines
2.0 KiB
ReStructuredText
Add SIGINT protection to our `pdbpp` based debugger subystem such that
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for (single-depth) actor trees in debug mode we ignore interrupts in any
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actor currently holding the TTY lock thus avoiding clobbering IPC
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connections and/or task and process state when working in the REPL.
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As a big note currently so called "nested" actor trees (trees with
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actors having more then one parent/ancestor) are not fully supported
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since we don't yet have a mechanism to relay the debug mode knowledge
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"up" the actor tree (for eg. when handling a crash in a leaf actor).
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As such currently there is a set of tests and known scenarios which will
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result in process cloberring by the zombie repaing machinery and these
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have been documented in https://github.com/goodboy/tractor/issues/320.
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The implementation details include:
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- utilizing a custom SIGINT handler which we apply whenever an actor's
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runtime enters the debug machinery, which we also make sure the
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stdlib's `pdb` configuration doesn't override (which it does by
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default without special instance config).
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- litter the runtime with `maybe_wait_for_debugger()` mostly in spots
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where the root actor should block before doing embedded nursery
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teardown ops which both cancel potential-children-in-deubg as well
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as eventually trigger zombie reaping machinery.
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- hardening of the TTY locking semantics/API both in terms of IPC
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terminations and cancellation and lock release determinism from
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sync debugger instance methods.
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- factoring of locking infrastructure into a new `._debug.Lock` global
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which encapsulates all details of the ``trio`` sync primitives and
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task/actor uid management and tracking.
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We also add `ctrl-c` cases throughout the test suite though these are
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disabled for py3.9 (`pdbpp` UX differences that don't seem worth
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compensating for, especially since this will be our last 3.9 supported
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release) and there are a slew of marked cases that aren't expected to
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work in CI more generally (as mentioned in the "nested" tree note
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above) despite seemingly working when run manually on linux.
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