287 lines
12 KiB
Python
287 lines
12 KiB
Python
"""IPC/SHM tests: encode/decode round-trips, corruption handling, ring semantics.
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Pins the agreed contract:
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* encode -> decode is lossless for raw/preprocessed traces and result payloads;
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* a corrupt/truncated frame raises a single, catchable ValueError (never a bare
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struct.error / UnicodeDecodeError);
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* the ring is latest-wins: on overflow the oldest slot is overwritten and a slow
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reader keeps the freshest frames;
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* peek_latest returns the newest frame without consuming it;
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* opening a missing/incompatible ring fails fast.
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"""
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from __future__ import annotations
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import struct
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import unittest
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from contextlib import suppress
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from pathlib import Path
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import numpy as np
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from python_app.models.dataset_model import (
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ComboKey,
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ResultBlock,
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ResultCollection,
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ResultPayload,
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SweepCollection,
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TraceData,
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)
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from python_app.orchestration.shm.decoder import (
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PREPROC_MAGIC,
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RAW_MAGIC,
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RESULT_MAGIC,
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decode_result_collection,
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decode_trace_collection,
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)
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from python_app.orchestration.shm.ring_reader import ShmRingReader
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from python_app.orchestration.shm.ring_writer import ShmRingWriter
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from python_app.storage.npz.serialize import serialize_result_collection, serialize_trace_collection
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def _trace(in_pos: int, out_pos: int, n: int, *, capture_ns: tuple[int, int] = (0, 0)) -> TraceData:
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"""Build a trace with float32-exact data so round-trips compare exactly."""
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freq = np.arange(n, dtype=np.float32) + 1.0
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s11 = (np.arange(n, dtype=np.float32) + 0.5j * np.arange(n, dtype=np.float32)).astype(np.complex64)
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s21 = (-np.arange(n, dtype=np.float32) + 2.0j * np.arange(n, dtype=np.float32)).astype(np.complex64)
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return TraceData(
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combo=ComboKey(input=in_pos, output=out_pos),
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frequency_hz=freq,
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s11=s11,
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s21=s21,
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capture_start_ns=capture_ns[0],
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capture_end_ns=capture_ns[1],
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)
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class TraceCollectionRoundTripTest(unittest.TestCase):
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def _assert_round_trips(self, magic: int) -> None:
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collection = SweepCollection(
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collection_id=7,
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monotonic_ns=123,
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traces=[_trace(0, 0, 4, capture_ns=(11, 13)), _trace(3, 1, 2, capture_ns=(15, 19))],
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capture_start_ns=10,
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capture_end_ns=20,
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)
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decoded = decode_trace_collection(serialize_trace_collection(collection, magic), magic)
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self.assertEqual(decoded.collection_id, 7)
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self.assertEqual(decoded.monotonic_ns, 123)
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self.assertEqual((decoded.capture_start_ns, decoded.capture_end_ns), (10, 20))
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self.assertEqual(len(decoded.traces), 2)
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for original, got in zip(collection.traces, decoded.traces):
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self.assertEqual((got.combo.input, got.combo.output), (original.combo.input, original.combo.output))
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self.assertTrue(np.array_equal(got.frequency_hz, original.frequency_hz))
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self.assertTrue(np.array_equal(got.s11, original.s11))
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self.assertTrue(np.array_equal(got.s21, original.s21))
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self.assertEqual(
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(got.capture_start_ns, got.capture_end_ns),
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(original.capture_start_ns, original.capture_end_ns),
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)
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def test_raw_round_trips(self) -> None:
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self._assert_round_trips(RAW_MAGIC)
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def test_preprocessed_round_trips(self) -> None:
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self._assert_round_trips(PREPROC_MAGIC)
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def test_empty_traces_round_trip(self) -> None:
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collection = SweepCollection(collection_id=1, monotonic_ns=2, traces=[])
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decoded = decode_trace_collection(serialize_trace_collection(collection, RAW_MAGIC), RAW_MAGIC)
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self.assertEqual(decoded.traces, [])
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def test_payload_without_per_trace_window_table_still_decodes(self) -> None:
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# A producer built before per-trace timing stops after the collection
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# window; its traces must still decode, with the timestamps left at zero.
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collection = SweepCollection(
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collection_id=4,
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monotonic_ns=5,
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traces=[_trace(1, 0, 3, capture_ns=(7, 9))],
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capture_start_ns=6,
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capture_end_ns=10,
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)
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full = serialize_trace_collection(collection, RAW_MAGIC)
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legacy = full[: -(4 + 16 * len(collection.traces))]
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decoded = decode_trace_collection(legacy, RAW_MAGIC)
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self.assertEqual((decoded.capture_start_ns, decoded.capture_end_ns), (6, 10))
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self.assertEqual(len(decoded.traces), 1)
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self.assertEqual((decoded.traces[0].capture_start_ns, decoded.traces[0].capture_end_ns), (0, 0))
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def test_per_trace_window_count_mismatch_is_rejected(self) -> None:
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collection = SweepCollection(
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collection_id=4, monotonic_ns=5, traces=[_trace(1, 0, 3, capture_ns=(7, 9))]
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)
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payload = serialize_trace_collection(collection, RAW_MAGIC)
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# Overwrite the window-table count (u32 before the single 16-byte pair).
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corrupt = payload[:-20] + struct.pack("<I", 2) + payload[-16:]
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with self.assertRaises(ValueError):
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decode_trace_collection(corrupt, RAW_MAGIC)
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class ResultCollectionRoundTripTest(unittest.TestCase):
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def test_all_payload_kinds_round_trip(self) -> None:
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image = np.arange(6, dtype=np.float32).reshape((2, 3))
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table = np.array([[0.0, 1.0, 2.0], [3.0, 4.0, 5.0]], dtype=np.float32)
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collection = ResultCollection(
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collection_id=9,
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monotonic_ns=42,
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processing_duration_ns=1000,
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collection_payloads=[
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ResultPayload(
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processing_name="gpr_accumulator", kind=3,
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image_x_axis=np.array([0.0, 1.0, 2.0], dtype=np.float32),
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image_y_axis=np.array([0.0, 1.0], dtype=np.float32),
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image=image,
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),
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ResultPayload(processing_name="gpr_points", kind=4, table=table),
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],
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blocks=[
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ResultBlock(combo=ComboKey(input=1, output=0), payloads=[
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ResultPayload(
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processing_name="bscan", kind=1,
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frequency_hz=np.array([1.0, 2.0], dtype=np.float32),
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trace=np.array([1 + 1j, 2 - 2j], dtype=np.complex64),
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),
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ResultPayload(processing_name="snr", kind=2, scalar_value=2.5),
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]),
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],
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)
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decoded = decode_result_collection(serialize_result_collection(collection))
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self.assertEqual((decoded.collection_id, decoded.monotonic_ns, decoded.processing_duration_ns), (9, 42, 1000))
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acc, points = decoded.collection_payloads
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self.assertEqual(acc.processing_name, "gpr_accumulator")
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self.assertTrue(np.array_equal(acc.image, image))
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self.assertTrue(np.array_equal(points.table, table))
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block = decoded.blocks[0]
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self.assertEqual((block.combo.input, block.combo.output), (1, 0))
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self.assertTrue(np.array_equal(block.payloads[0].trace, np.array([1 + 1j, 2 - 2j], dtype=np.complex64)))
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self.assertAlmostEqual(block.payloads[1].scalar_value, 2.5)
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class CorruptFrameTest(unittest.TestCase):
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"""Any corruption surfaces as ValueError (the single catchable contract)."""
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def _valid_trace_bytes(self) -> bytes:
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return serialize_trace_collection(
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SweepCollection(collection_id=1, monotonic_ns=1, traces=[_trace(0, 0, 3)]), RAW_MAGIC
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)
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def test_bad_magic(self) -> None:
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corrupt = b"\x00\x00\x00\x00" + self._valid_trace_bytes()[4:]
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with self.assertRaises(ValueError):
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decode_trace_collection(corrupt, RAW_MAGIC)
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def test_truncated_buffer(self) -> None:
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with self.assertRaises(ValueError):
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decode_trace_collection(self._valid_trace_bytes()[:18], RAW_MAGIC)
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def test_absurd_trace_count(self) -> None:
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# Claims 1e6 traces but supplies none -> the first trace read runs off the end.
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corrupt = struct.pack("<IQQI", RAW_MAGIC, 1, 1, 1_000_000)
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with self.assertRaises(ValueError):
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decode_trace_collection(corrupt, RAW_MAGIC)
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def test_unsupported_payload_kind(self) -> None:
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corrupt = struct.pack("<IQQQII", RESULT_MAGIC, 1, 1, 0, 1, 0) + struct.pack("<BH", 99, 0)
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with self.assertRaises(ValueError):
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decode_result_collection(corrupt)
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def test_invalid_utf8_name(self) -> None:
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corrupt = struct.pack("<IQQQII", RESULT_MAGIC, 1, 1, 0, 1, 0) + struct.pack("<BH", 2, 1) + b"\xff"
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with self.assertRaises(ValueError):
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decode_result_collection(corrupt)
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class _RingTestCase(unittest.TestCase):
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"""Base case that creates/cleans named /dev/shm rings."""
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def _ring_name(self, suffix: str = "") -> str:
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return f"/radar_test_{self._testMethodName}{suffix}"
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def _writer(self, name: str, capacity: int, slot_size: int) -> ShmRingWriter:
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with suppress(OSError):
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(Path("/dev/shm") / name[1:]).unlink() # drop a leftover from a crashed run
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writer = ShmRingWriter(name, capacity, slot_size)
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self.addCleanup(self._cleanup, name, writer)
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return writer
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def _reader(self, name: str, **kw: object) -> ShmRingReader:
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reader = ShmRingReader(name, **kw)
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self.addCleanup(self._safe_close, reader)
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return reader
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@staticmethod
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def _safe_close(obj: object) -> None:
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with suppress(Exception):
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obj.close() # type: ignore[attr-defined]
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@staticmethod
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def _cleanup(name: str, writer: ShmRingWriter) -> None:
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with suppress(Exception):
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writer.close()
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with suppress(OSError):
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(Path("/dev/shm") / name[1:]).unlink()
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class RingRoundTripTest(_RingTestCase):
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def test_fifo_round_trip(self) -> None:
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name = self._ring_name()
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writer = self._writer(name, capacity=8, slot_size=64)
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reader = self._reader(name)
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payloads = [f"frame{i}".encode() for i in range(5)]
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for p in payloads:
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self.assertTrue(writer.push(p))
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self.assertEqual([reader.pop_payload() for _ in payloads], payloads)
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self.assertIsNone(reader.pop_payload()) # empty afterwards
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def test_oversized_payload_rejected(self) -> None:
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writer = self._writer(self._ring_name(), capacity=4, slot_size=8)
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self.assertFalse(writer.push(b"x" * 9)) # larger than the slot
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class RingOverflowTest(_RingTestCase):
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def test_latest_wins_drops_oldest(self) -> None:
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name = self._ring_name()
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writer = self._writer(name, capacity=4, slot_size=64)
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reader = self._reader(name)
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for i in range(7): # 3 more than capacity
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self.assertTrue(writer.push(f"f{i}".encode()))
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# The 4 newest survive; the 3 oldest were overwritten.
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survivors = []
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while (item := reader.pop_payload()) is not None:
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survivors.append(item)
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self.assertEqual(survivors, [b"f3", b"f4", b"f5", b"f6"])
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class PeekLatestTest(_RingTestCase):
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def test_peek_is_latest_and_non_consuming(self) -> None:
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name = self._ring_name()
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writer = self._writer(name, capacity=8, slot_size=64)
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reader = self._reader(name)
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self.assertIsNone(reader.peek_latest_payload()) # nothing published yet
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for i in range(3):
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writer.push(f"f{i}".encode())
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self.assertEqual(reader.peek_latest_payload(), b"f2") # newest
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self.assertEqual(reader.peek_latest_payload(), b"f2") # stable, not consumed
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self.assertEqual(reader.pop_payload(), b"f0") # consumer cursor untouched
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writer.push(b"f3")
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self.assertEqual(reader.peek_latest_payload(), b"f3") # follows the newest
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class RingOpenTest(_RingTestCase):
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def test_missing_ring_fails_fast(self) -> None:
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with self.assertRaises(FileNotFoundError):
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ShmRingReader("/radar_test_definitely_missing", open_timeout_s=0.1, open_poll_s=0.02)
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def test_incompatible_header_rejected(self) -> None:
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name = "/radar_test_bad_header"
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path = Path("/dev/shm") / name[1:]
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path.write_bytes(b"\x00" * 128) # right size, wrong magic
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self.addCleanup(lambda: path.unlink(missing_ok=True))
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with self.assertRaises(RuntimeError):
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ShmRingReader(name)
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if __name__ == "__main__":
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unittest.main()
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