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* feat: Python 3.12+/3.13 compat + sub-interpreter wrapper
Hanzo fork of go-python/cpy3. See HANZO_CHANGES.md for full diff.
- Polyfill APIs removed in 3.12 (per-type ClearFreeList helpers) and
3.13 (PyEval_InitThreads, Py_SetPath/PythonHome/ProgramName,
PySys_SetArgv/AddWarnOption/AddXOption/SetPath,
Py_SetStandardStreamEncoding, PyEval_ThreadsInitialized) so existing
call sites compile against modern CPython. Polyfills route to the
PyConfig API where there's a meaningful replacement, return 0/no-op
otherwise.
- New PEP 684 SubInterpreter wrapper (subinterp.go) — recommended
primitive for tenant/per-worker isolation on 3.12+. Defaults follow
PEP 684 (own GIL, threads on, no daemon threads, refuse non-isolated
C extensions). Falls back to Py_NewInterpreter on 3.11 and older.
- Free-threading awareness (PEP 703) — IsGILDisabled() reports at
runtime whether the linked CPython was built with --disable-gil.
- pkg-config switched from "python3" to "python3-embed" so libpython
links cleanly on Linux distros that split the embed flags.
- Module path: github.com/go-python/cpy3 -> github.com/hanzoai/cpy3.
Go 1.21+. Package name (python3) unchanged.
- CI matrix: Python {3.11, 3.12, 3.13} x Go {1.21, 1.22} on Ubuntu.
License remains MIT. Original go-python team credited in HANZO_CHANGES.md
and every modified file's header.
* feat: JSON hot-path helper + 3.13t build script
- LoadSource + CallJSONFunctionByName: single-cgo-crossing helpers
for the common "JSON-in, JSON-out" extension embedding contract.
Roughly 2x faster than the long form via individual wrappers and
stack-safer under sustained load (macOS SIGBUS at ~400k iters of
the 9-call long form is mitigated by collapsing to 1 cgo call).
- ErrUnknownFunction: sentinel error for missing/non-callable
lookups so callers can errors.Is.
- scripts/build-python313t.sh: idempotent local build of CPython
3.13.x with --disable-gil. Writes a python3-embed.pc so callers
steer via PKG_CONFIG_PATH.
- HANZO_CHANGES.md + README updated.
- .gitignore: exclude python313t-build/ python313t-src/.
* ci: split test runs by Python global state
TestSubInterpreter_* and TestCallJSONFunctionByName_* / TestLoadSource_*
share global Py state with the data-type/error tests. Running them
in the same `go test` invocation can hang on darwin after the
data-type tests have already touched the main interpreter. Split
into two test steps so each starts from a fresh process.
* test: move json_hotpath tests in-package + share Py init
Move from package python3_test to package python3 so they share
Py_Initialize() state with subinterp_test.go. Each test pins its
own OS thread, calls Py_Initialize (idempotent), creates a fresh
sub-interp, and unpins on return. No PyEval_SaveThread in teardown
— the sub-interp's Close already released the calling thread's GIL.
This eliminates a SIGSEGV-on-second-test pattern caused by trying
to PyEval_SaveThread a state that's already been saved.
* docs: README example for the JSON hot path
Show LoadSource + CallJSONFunctionByName end-to-end with luxfi/log
for context. The helpers themselves take no logger dependency.
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
/*
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SPDX-License-Identifier: MIT
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Hanzo additions, 2026-05-19.
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Sub-interpreter wrapper tests.
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*/
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package python3
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import (
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gort "runtime"
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"testing"
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)
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func TestIsGILDisabled_RuntimeQuery(t *testing.T) {
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// Just make sure it doesn't blow up. Value depends on whether
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// the linked CPython was built with --disable-gil. We log it so
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// CI logs show which build we're on.
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v := IsGILDisabled()
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t.Logf("IsGILDisabled = %v (Python version = %s)", v, Py_GetVersion())
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}
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// TestSubInterpreter_CreateAndClose verifies the smallest possible
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// PEP 684 round trip — create a sub-interpreter with default config,
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// enter it, run a trivial Python statement, leave, close.
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//
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// Requires Py_Initialize() to have run AND the calling thread to hold
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// the main interpreter's GIL when we call NewSubInterpreter — the
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// test harness handles that by pinning + initialising at the top.
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func TestSubInterpreter_CreateAndClose(t *testing.T) {
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gort.LockOSThread()
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defer gort.UnlockOSThread()
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Py_Initialize()
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// Caller invariant: hold the main GIL before NewSubInterpreter.
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// Py_Initialize leaves the calling thread holding the GIL.
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si, err := NewSubInterpreter(DefaultSubInterpreterConfig())
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if err != nil {
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t.Fatalf("NewSubInterpreter: %v", err)
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}
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defer si.Close()
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if si.ThreadState() == nil {
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t.Fatal("ThreadState returned nil after successful create")
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}
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si.Enter()
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// Trivial: run "1+1" as a Python expression via PyRun_SimpleString.
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rc := PyRun_SimpleString("x = 1 + 1")
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si.Leave()
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if rc != 0 {
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t.Fatalf("PyRun_SimpleString returned %d, want 0", rc)
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}
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}
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