Transcribe during recording with recoverable chunks and microphone activity icon
This commit is contained in:
@@ -0,0 +1,591 @@
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"""Concurrent, crash-recoverable recording and transcription sessions."""
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from __future__ import annotations
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import json
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import logging
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import queue
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import shutil
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import threading
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import time
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import uuid
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import wave
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from collections import deque
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from dataclasses import asdict, dataclass, is_dataclass, replace
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from pathlib import Path
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from types import MappingProxyType
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from typing import Any, Callable, Mapping
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import numpy as np
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from blurt_audio import StreamingAudio
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_ACTIVE_PATHS: set[Path] = set()
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_ACTIVE_LOCK = threading.Lock()
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def _atomic_json(path: Path, value: dict[str, Any]) -> None:
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temporary = path.with_suffix(path.suffix + ".tmp")
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temporary.write_text(json.dumps(value, indent=2), encoding="utf-8")
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temporary.replace(path)
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def _write_wav(path: Path, samples: np.ndarray) -> None:
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temporary = path.with_suffix(path.suffix + ".tmp")
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with wave.open(str(temporary), "wb") as output:
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output.setnchannels(1)
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output.setsampwidth(2)
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output.setframerate(16000)
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output.writeframes(np.asarray(samples, dtype="<i2").tobytes())
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temporary.replace(path)
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def _read_wav(path: Path) -> np.ndarray:
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with wave.open(str(path), "rb") as source:
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if source.getnchannels() != 1 or source.getsampwidth() != 2:
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raise ValueError(f"unsupported recovery WAV format: {path}")
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data = source.readframes(source.getnframes())
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rate = source.getframerate()
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samples = np.frombuffer(data, dtype="<i2").copy()
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if rate != 16000:
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raise ValueError(f"recovery WAV must be 16 kHz: {path}")
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return samples
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def _config_dict(config: Any) -> dict[str, Any]:
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if is_dataclass(config):
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return asdict(config)
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if isinstance(config, Mapping):
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return dict(config)
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return dict(vars(config))
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def _public_config(config: Any) -> dict[str, Any]:
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blocked = ("key", "token", "secret", "password", "auth", "credential")
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return {
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str(k): v
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for k, v in _config_dict(config).items()
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if not any(word in str(k).lower() for word in blocked)
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and isinstance(v, (str, int, float, bool, type(None)))
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}
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@dataclass(frozen=True)
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class SessionResult:
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session_id: str
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text: str
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complete: bool
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errors: tuple[str, ...] = ()
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@dataclass(frozen=True)
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class RecoveryRecord:
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session_id: str
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path: Path
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state: str
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config: Mapping[str, Any]
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done: int
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total: int
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created_at: float = 0.0
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@dataclass
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class _Job:
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session: "RecordingSession"
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index: int
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path: Path
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config: Any
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class TranscriptionScheduler:
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"""A shared worker pool whose pending payloads live as WAV files on disk."""
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def __init__(self, request: Callable[[np.ndarray, Any], str], workers: int = 3,
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queue_size: int = 96):
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if workers < 1:
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raise ValueError("workers must be positive")
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self.request = request
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self._ready: queue.Queue[_Job | None] = queue.Queue(maxsize=max(workers, queue_size))
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self._overflow: deque[_Job] = deque()
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self._lock = threading.Lock()
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self._closed = False
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self._threads = [threading.Thread(target=self._worker, name=f"blurt-upload-{i}", daemon=True)
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for i in range(workers)]
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for thread in self._threads:
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thread.start()
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def submit(self, session: "RecordingSession", index: int, path: Path,
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config: Any) -> None:
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job = _Job(session, index, path, config)
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with self._lock:
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if self._closed:
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raise RuntimeError("transcription scheduler is shut down")
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try:
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self._ready.put_nowait(job)
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except queue.Full:
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# Only tiny disk references are retained here; audio remains on disk.
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self._overflow.append(job)
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def _refill(self) -> None:
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with self._lock:
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while self._overflow:
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try:
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self._ready.put_nowait(self._overflow[0])
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except queue.Full:
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break
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self._overflow.popleft()
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def _worker(self) -> None:
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while True:
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try:
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job = self._ready.get(timeout=0.1)
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except queue.Empty:
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with self._lock:
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if self._closed and not self._overflow:
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return
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continue
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text = None
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error = None
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try:
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samples = _read_wav(job.path)
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text = self.request(samples, job.config)
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if not isinstance(text, str) or not text.strip():
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raise ValueError("transcription returned empty text")
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text = text.strip()
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except Exception as exception:
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error = f"{type(exception).__name__}: {exception}"
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try:
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job.session._job_finished(job.index, text, error)
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except Exception:
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# Session persistence/callback failures must not terminate the pool.
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logging.exception("Could not record transcription result for %s", job.path)
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finally:
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self._ready.task_done()
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self._refill()
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def shutdown(self, wait: bool = True) -> None:
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with self._lock:
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self._closed = True
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if wait:
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for thread in self._threads:
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thread.join()
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class RecordingSession:
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"""Owns capture, chunk persistence, ordered results, and one recording lifecycle."""
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def __init__(self, rate: int, channels: int, config: Any, spool_dir: str | Path,
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scheduler: TranscriptionScheduler, on_update: Callable[["RecordingSession"], None] | None = None,
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on_complete: Callable[["RecordingSession"], None] | None = None,
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input_queue_size: int = 64):
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self.session_id = uuid.uuid4().hex
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self.path = Path(spool_dir) / self.session_id
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self.path.mkdir(parents=True, exist_ok=False)
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self.config = config
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self.scheduler = scheduler
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self.on_update = on_update
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self.on_complete = on_complete
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self.state = "recording"
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self.done = 0
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self.total = 0
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self.result: SessionResult | None = None
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self.created_at = time.time()
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self._entries: list[dict[str, Any]] = []
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self._submitted: set[int] = set()
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self._capture_persisted_ok = False
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self._lock = threading.RLock()
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self._condition = threading.Condition(self._lock)
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self._input: queue.Queue[np.ndarray] = queue.Queue(maxsize=input_queue_size)
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self._stop = threading.Event()
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self._producer_done = threading.Event()
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self._overflow_error = threading.Event()
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self._input_statuses: queue.SimpleQueue[str] = queue.SimpleQueue()
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self._audio = StreamingAudio(rate, channels)
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self._last_checkpoint = time.monotonic()
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self._tail_start = 0
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self._manifest_path = self.path / "session.json"
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with _ACTIVE_LOCK:
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_ACTIVE_PATHS.add(self.path.resolve())
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try:
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self._save()
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except Exception:
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self.release_for_retry()
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raise
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self._producer = threading.Thread(target=self._produce, name=f"blurt-capture-{self.session_id[:6]}", daemon=True)
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self._producer.start()
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def feed(self, indata: np.ndarray) -> bool:
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if self.state != "recording":
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return False
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try:
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self._input.put_nowait(np.array(indata, copy=True))
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return True
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except queue.Full:
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# The sound callback must never wait for a lock or filesystem.
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self.state = "capture_failed"
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self._overflow_error.set()
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self._stop.set()
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return False
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def stop(self) -> None:
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with self._lock:
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if self.state == "recording":
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self.state = "finishing"
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self._stop.set()
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self._save()
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def report_input_status(self, status: object) -> None:
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"""Record a PortAudio status without blocking its callback thread."""
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if status:
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self._input_statuses.put(str(status))
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def producer_join(self, timeout: float | None = None) -> bool:
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self._producer.join(timeout)
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return not self._producer.is_alive()
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def join(self, timeout: float | None = None) -> SessionResult | None:
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deadline = None if timeout is None else time.monotonic() + timeout
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with self._condition:
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while self.result is None:
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remaining = None if deadline is None else deadline - time.monotonic()
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if remaining is not None and remaining <= 0:
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return None
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self._condition.wait(remaining)
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return self.result
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def _produce(self) -> None:
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try:
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while True:
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try:
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block = self._input.get(timeout=0.05)
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except queue.Empty:
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if self._stop.is_set():
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break
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continue
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try:
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for chunk in self._audio.feed(block):
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self._seal(chunk)
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if time.monotonic() - self._last_checkpoint >= 1.0:
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self._checkpoint()
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finally:
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self._input.task_done()
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for chunk in self._audio.finish():
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self._seal(chunk)
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self._remove_tail()
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if self._overflow_error.is_set():
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with self._lock:
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self._entries.append({"index": len(self._entries), "speech": False,
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"status": "failed", "error": "capture input queue overflowed; audio was lost"})
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self._save()
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self._persist_input_statuses()
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self._capture_persisted_ok = True
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except Exception as error:
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with self._lock:
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self.state = "capture_failed"
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for entry in self._entries:
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if (entry.get("speech") and entry.get("status") == "pending"
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and int(entry["index"]) not in self._submitted):
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entry["status"] = "failed"
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entry["error"] = f"capture: {type(error).__name__}: {error}"
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self.done += 1
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self._entries.append({"index": len(self._entries), "speech": False,
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"status": "failed",
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"error": f"capture: {type(error).__name__}: {error}"})
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try:
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self._save()
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except OSError:
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pass
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finally:
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self._producer_done.set()
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self._maybe_complete()
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def _persist_input_statuses(self) -> None:
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statuses = []
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while not self._input_statuses.empty():
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statuses.append(self._input_statuses.get())
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if statuses:
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with self._lock:
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self._entries.append({"index": len(self._entries), "speech": False,
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"status": "failed", "error": "input stream status: " + ", ".join(statuses)})
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self._save()
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@staticmethod
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def _chunk_value(chunk: Any, name: str, default: Any = None) -> Any:
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return getattr(chunk, name, default)
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def _seal(self, chunk: Any) -> None:
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samples = np.asarray(self._chunk_value(chunk, "samples"), dtype=np.int16)
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speech = bool(self._chunk_value(chunk, "speech", True))
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with self._lock:
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index = len(self._entries)
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filename = f"chunk-{index:06d}.wav"
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entry = {"index": index, "file": filename, "speech": speech,
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"start": self._chunk_value(chunk, "start", None),
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"end": self._chunk_value(chunk, "end", None), "status": "pending"}
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if not speech:
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entry["status"] = "skipped"
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entry["text"] = ""
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self._entries.append(entry)
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self.total += int(speech)
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_write_wav(self.path / filename, samples)
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# Commit the sealed file before removing the previous recovery tail.
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self._save()
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self._remove_tail_locked()
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self._tail_start = int(entry.get("end") or self._tail_start)
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self._save()
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if speech:
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self.scheduler.submit(self, index, self.path / filename, self.config)
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with self._lock:
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self._submitted.add(index)
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self._notify()
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def _checkpoint(self) -> None:
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tail = np.asarray(self._audio.checkpoint(), dtype=np.int16)
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with self._lock:
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if tail.size:
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_write_wav(self.path / "tail.wav", tail)
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ends = [int(e["end"]) for e in self._entries if e.get("end") is not None]
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self._tail_start = max(ends, default=0)
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else:
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self._remove_tail_locked()
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self._last_checkpoint = time.monotonic()
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self._save()
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def _remove_tail_locked(self) -> None:
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(self.path / "tail.wav").unlink(missing_ok=True)
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def _remove_tail(self) -> None:
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with self._lock:
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self._remove_tail_locked()
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self._save()
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def _job_finished(self, index: int, text: str | None, error: str | None) -> None:
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with self._lock:
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entry = self._entries[index]
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entry["status"] = "done" if error is None else "failed"
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if text is not None:
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entry["text"] = text
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if error is not None:
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entry["error"] = error
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self.done += 1
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try:
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self._save()
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except OSError as persistence_error:
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entry.pop("text", None)
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entry["status"] = "failed"
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entry["error"] = (
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f"could not persist transcription: {type(persistence_error).__name__}: "
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f"{persistence_error}"
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)
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self._notify()
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self._maybe_complete()
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def _maybe_complete(self) -> None:
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callback = None
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with self._condition:
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if not self._producer_done.is_set() or self.done < self.total or self.result is not None:
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return
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errors = tuple(str(e["error"]) for e in self._entries if e.get("error"))
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has_text = any(entry.get("text") for entry in self._entries)
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parts = []
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gap = False
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for entry in self._entries:
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if entry.get("text"):
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if gap and has_text:
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parts.append("[…]")
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gap = False
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parts.append(str(entry["text"]))
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elif entry.get("error"):
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gap = True
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if gap and has_text:
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parts.append("[…]")
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text = " ".join(parts)
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complete = not errors
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self.state = "complete" if complete else "needs_retry"
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self.result = SessionResult(self.session_id, text, complete, errors)
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try:
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self._save()
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except OSError:
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complete = False
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self.state = "needs_retry"
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errors = errors + ("could not persist final session state",)
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self.result = SessionResult(self.session_id, text, False, errors)
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self._condition.notify_all()
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callback = self.on_complete
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if callback:
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try:
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callback(self)
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except Exception:
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logging.exception("Session completion callback failed: %s", self.session_id)
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self.release_for_retry()
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def _notify(self) -> None:
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if self.on_update:
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try:
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self.on_update(self)
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except Exception:
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logging.exception("Session progress callback failed: %s", self.session_id)
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def _save(self) -> None:
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_atomic_json(self._manifest_path, {"version": 1, "session_id": self.session_id,
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"state": self.state, "config": _public_config(self.config), "done": self.done,
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"total": self.total, "created_at": self.created_at, "entries": self._entries,
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"has_tail": (self.path / "tail.wav").exists(), "tail_start": self._tail_start})
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def acknowledge_delivery(self) -> None:
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with self._lock:
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if self.result is None:
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raise RuntimeError("session is not finished")
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if self.result.complete:
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shutil.rmtree(self.path)
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else:
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self.state = "needs_retry"
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self._save()
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with _ACTIVE_LOCK:
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_ACTIVE_PATHS.discard(self.path.resolve())
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def release_for_retry(self) -> None:
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"""Make retained data discoverable after delivery is deferred or fails."""
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with _ACTIVE_LOCK:
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_ACTIVE_PATHS.discard(self.path.resolve())
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@classmethod
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def recover(cls, path: str | Path, config: Any, scheduler: TranscriptionScheduler,
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on_update=None, on_complete=None) -> "RecordingSession":
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return _recover_session(Path(path), config, scheduler, on_update, on_complete)
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@classmethod
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def from_wav(cls, wav_path: str | Path, config: Any, spool_dir: str | Path,
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scheduler: TranscriptionScheduler, on_update=None, on_complete=None) -> "RecordingSession":
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samples = _read_wav(Path(wav_path))
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session = cls(16000, 1, config, spool_dir, scheduler, on_update, on_complete)
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session.feed(samples.reshape(-1, 1).astype(np.float32) / 32768.0)
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session.stop()
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session.producer_join()
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if session._capture_persisted_ok:
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Path(wav_path).unlink(missing_ok=True)
|
||||
return session
|
||||
|
||||
|
||||
def _recover_session(path: Path, config: Any, scheduler: TranscriptionScheduler,
|
||||
on_update=None, on_complete=None) -> RecordingSession:
|
||||
data = json.loads((path / "session.json").read_text(encoding="utf-8"))
|
||||
session = object.__new__(RecordingSession)
|
||||
session.session_id, session.path = data["session_id"], path
|
||||
saved = data.get("config", {})
|
||||
if is_dataclass(config):
|
||||
fields = getattr(config, "__dataclass_fields__", {})
|
||||
session.config = replace(config, **{k: v for k, v in saved.items() if k in fields})
|
||||
else:
|
||||
merged = dict(saved); merged.update(_config_dict(config))
|
||||
session.config = MappingProxyType(merged)
|
||||
session.scheduler, session.on_update, session.on_complete = scheduler, on_update, on_complete
|
||||
session.state, session.done, session.total = "finishing", 0, 0
|
||||
session.result = None
|
||||
session.created_at = float(data.get("created_at", path.stat().st_mtime))
|
||||
session._entries = data.get("entries", [])
|
||||
session._submitted = set()
|
||||
session._capture_persisted_ok = True
|
||||
session._lock = threading.RLock(); session._condition = threading.Condition(session._lock)
|
||||
session._input = queue.Queue(); session._stop = threading.Event(); session._stop.set()
|
||||
session._producer_done = threading.Event(); session._producer_done.set()
|
||||
session._overflow_error = threading.Event()
|
||||
session._input_statuses = queue.SimpleQueue()
|
||||
session._audio = None; session._last_checkpoint = time.monotonic()
|
||||
session._tail_start = int(data.get("tail_start", 0))
|
||||
session._manifest_path = path / "session.json"
|
||||
referenced = {entry.get("file") for entry in session._entries}
|
||||
orphans = [candidate for candidate in sorted(path.glob("chunk-*.wav"))
|
||||
if candidate.name not in referenced]
|
||||
sealed_end = max((int(e.get("end") or 0) for e in session._entries), default=0)
|
||||
for orphan in orphans:
|
||||
samples = _read_wav(orphan)
|
||||
index = len(session._entries)
|
||||
speech = bool(samples.size and np.max(np.abs(samples.astype(np.int32))) > 1)
|
||||
session._entries.append({"index": index, "file": orphan.name, "speech": speech,
|
||||
"status": "pending" if speech else "skipped",
|
||||
"start": sealed_end, "end": sealed_end + len(samples),
|
||||
"recovered_orphan": True})
|
||||
sealed_end += len(samples)
|
||||
tail = path / "tail.wav"
|
||||
if tail.exists():
|
||||
tail_samples = _read_wav(tail)
|
||||
overlap = max(0, sealed_end - session._tail_start)
|
||||
if overlap:
|
||||
tail_samples = tail_samples[min(overlap, len(tail_samples)):]
|
||||
index = len(session._entries)
|
||||
target = path / f"chunk-{index:06d}.wav"
|
||||
if len(tail_samples):
|
||||
_write_wav(target, tail_samples)
|
||||
speech = bool(np.max(np.abs(tail_samples.astype(np.int32))) > 1)
|
||||
session._entries.append({"index": index, "file": target.name, "speech": speech,
|
||||
"status": "pending" if speech else "skipped",
|
||||
"start": sealed_end, "end": sealed_end + len(tail_samples),
|
||||
"recovered_tail": True})
|
||||
pending = []
|
||||
for entry in session._entries:
|
||||
if entry.get("speech") and entry.get("status") != "done" and entry.get("file") and (path / entry["file"]).exists():
|
||||
entry["status"] = "pending"; entry.pop("error", None)
|
||||
pending.append(entry)
|
||||
elif entry.get("speech") and entry.get("status") != "done":
|
||||
entry["status"] = "failed"
|
||||
entry["error"] = "recovery audio file is missing"
|
||||
session.done += 1
|
||||
elif entry.get("speech"):
|
||||
session.done += 1
|
||||
session.total = sum(bool(e.get("speech")) for e in session._entries)
|
||||
with _ACTIVE_LOCK:
|
||||
_ACTIVE_PATHS.add(path.resolve())
|
||||
# Commit adopted orphan/suffix entries before deleting the original tail.
|
||||
try:
|
||||
session._save()
|
||||
tail.unlink(missing_ok=True)
|
||||
session._save()
|
||||
except Exception:
|
||||
session.release_for_retry()
|
||||
raise
|
||||
|
||||
def start_recovery() -> None:
|
||||
for entry in pending:
|
||||
try:
|
||||
scheduler.submit(session, entry["index"], path / entry["file"], session.config)
|
||||
session._submitted.add(int(entry["index"]))
|
||||
except Exception as error:
|
||||
session._job_finished(entry["index"], None, f"Could not schedule retry: {error}")
|
||||
session._maybe_complete()
|
||||
|
||||
session._producer = threading.Thread(target=start_recovery, name="BlurtRecovery", daemon=True)
|
||||
session._producer.start()
|
||||
return session
|
||||
|
||||
|
||||
class RecoveryStore:
|
||||
def __init__(self, spool_dir: str | Path):
|
||||
self.spool_dir = Path(spool_dir)
|
||||
|
||||
def discover(self) -> list[RecoveryRecord]:
|
||||
records = []
|
||||
if not self.spool_dir.exists():
|
||||
return records
|
||||
for manifest in sorted(self.spool_dir.glob("*/session.json")):
|
||||
try:
|
||||
with _ACTIVE_LOCK:
|
||||
if manifest.parent.resolve() in _ACTIVE_PATHS:
|
||||
continue
|
||||
data = json.loads(manifest.read_text(encoding="utf-8"))
|
||||
records.append(RecoveryRecord(data["session_id"], manifest.parent,
|
||||
data.get("state", "interrupted"), MappingProxyType(data.get("config", {})),
|
||||
int(data.get("done", 0)), int(data.get("total", 0)),
|
||||
float(data.get("created_at", manifest.stat().st_mtime))))
|
||||
except (OSError, ValueError, KeyError):
|
||||
continue
|
||||
return sorted(records, key=lambda record: record.created_at)
|
||||
|
||||
def resume(self, record: RecoveryRecord | str, config: Any,
|
||||
scheduler: TranscriptionScheduler, on_update=None, on_complete=None) -> RecordingSession:
|
||||
if isinstance(record, str):
|
||||
path = self.spool_dir / record
|
||||
else:
|
||||
path = record.path
|
||||
return RecordingSession.recover(path, config, scheduler, on_update, on_complete)
|
||||
Reference in New Issue
Block a user