ske087
c720f4ca67
- drop unused BAR import, _VALID_MODES, _is_optional(), OPTIONAL_IMPORTS and is_loopback() - replace hand-written event name strings with EVENT_INSERTED, EVENT_REMOVED and EVENT_INVALID, so a typo cannot silently disable an event path - drop the now-moot pytest/coverage entries from .gitignore Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
"""Simulated card reads, so the output can be checked without hardware."""
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from __future__ import annotations
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import random
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import time
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from .card import (
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DEFAULT_HEARTBEAT_INTERVAL,
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EVENT_INVALID,
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EVENT_INSERTED,
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EVENT_REMOVED,
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CardData,
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CardEvent,
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format_event,
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)
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# Card ids with the checksum the real protocol would produce
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# (XOR of the type byte and the four id bytes), so the output looks genuine.
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DEMO_CARDS = (
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CardData(value=0x00C4A0B5, checksum=0xDE, type=0x0F, is_valid=True),
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CardData(value=0x1A2B3C4D, checksum=0x4F, type=0x0F, is_valid=True),
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CardData(value=0xDEADBEEF, checksum=0x00, type=0x0F, is_valid=False),
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)
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def _emit(event: CardEvent, as_json: bool) -> None:
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print(event.to_json() if as_json else format_event(event), flush=True)
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def run_demo(
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count: int = 3,
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heartbeat: float = DEFAULT_HEARTBEAT_INTERVAL,
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as_json: bool = False,
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seed: int = 1234,
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) -> int:
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"""Print *count* simulated card read cycles. Returns a process exit code."""
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rng = random.Random(seed)
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print("Demo mode - no hardware is used, values are simulated.\n", flush=True)
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for _ in range(max(1, count)):
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card = rng.choice(DEMO_CARDS)
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event_name = EVENT_INSERTED if card.is_valid else EVENT_INVALID
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_emit(CardEvent.from_card(event_name, card, "demo"), as_json)
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time.sleep(max(0.1, heartbeat))
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if card.is_valid:
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_emit(CardEvent.from_card(EVENT_REMOVED, card, "demo"), as_json)
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time.sleep(0.3)
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print("\nDemo finished.", flush=True)
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return 0
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