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annotate dictation/session.py @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 78699f810817
children 49e9e591c9bb
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1 from __future__ import annotations
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2
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3 import asyncio
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4 import json
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5 from typing import Any
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6
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7 from aiortc.mediastreams import MediaStreamError
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8 from av.audio.resampler import AudioResampler
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9 import numpy as np
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10
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11 from dictation.audio import AudioEventKind, AudioSegmenter
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12 from dictation.config import DictationConfig
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13 from dictation.transcriber import Transcriber
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14
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15
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16 class DictationSession:
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17 def __init__(
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18 self,
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19 session_id: str,
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20 peer: Any,
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21 transcriber: Transcriber,
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22 config: DictationConfig,
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23 ) -> None:
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24 self.session_id = session_id
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25 self.peer = peer
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26 self.transcriber = transcriber
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27 self.segmenter = AudioSegmenter(
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28 speech_threshold=config.speech_threshold,
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29 silence_ms=config.silence_ms,
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30 partial_interval_ms=config.partial_interval_ms,
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31 max_utterance_seconds=config.max_utterance_seconds,
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32 )
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33 self.channel = None
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34 self.audio_task: asyncio.Task | None = None
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35 self.partial_task: asyncio.Task | None = None
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36 self.final_tasks: set[asyncio.Task] = set()
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37 self.closed = False
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38 self.stopping = False
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39 self._resampler = AudioResampler(
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40 format="s16",
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41 layout="mono",
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42 rate=16000,
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43 )
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44
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45 def attach_channel(self, channel: Any) -> None:
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46 if channel.label != "transcripts":
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47 channel.close()
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48 return
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49 self.channel = channel
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50
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51 @channel.on("open")
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52 def on_open() -> None:
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53 self.send("ready", sessionId=self.session_id)
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54
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55 @channel.on("message")
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56 def on_message(message: Any) -> None:
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57 if message == "stop":
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58 self.stopping = True
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59 event = self.segmenter.flush()
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60 if event and event.samples is not None:
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61 self._start_final(event.samples)
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62 else:
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63 self.send("speech.ended")
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64
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65 if channel.readyState == "open":
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66 self.send("ready", sessionId=self.session_id)
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67
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68 def attach_track(self, track: Any) -> None:
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69 if track.kind != "audio" or self.audio_task is not None:
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70 return
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71 self.audio_task = asyncio.create_task(self._consume_audio(track))
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72
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73 async def _consume_audio(self, track: Any) -> None:
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74 try:
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75 while not self.closed:
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76 frame = await track.recv()
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77 for converted in self._resampler.resample(frame):
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78 if self.stopping:
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79 continue
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80 samples = converted.to_ndarray().reshape(-1)
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81 normalized = samples.astype(np.float32) / 32768.0
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82 for event in self.segmenter.feed(normalized):
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83 if event.kind == AudioEventKind.SPEECH_STARTED:
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84 self.send("speech.started")
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85 elif (
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86 event.kind == AudioEventKind.PARTIAL_READY
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87 and event.samples is not None
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88 ):
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89 self._start_partial(event.samples)
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90 elif (
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91 event.kind == AudioEventKind.FINAL_READY
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92 and event.samples is not None
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93 ):
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94 self._start_final(event.samples)
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95 except MediaStreamError:
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96 if not self.stopping:
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97 event = self.segmenter.flush()
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98 if event and event.samples is not None:
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99 self._start_final(event.samples)
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100 else:
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101 self.send("speech.ended")
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102 except asyncio.CancelledError:
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103 raise
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104 except Exception as error:
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105 if not self.closed:
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106 self.send(
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107 "error",
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108 code="audio_track_failed",
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109 message=str(error),
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110 )
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111
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112 def _start_partial(self, samples: np.ndarray) -> None:
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113 if self.partial_task and not self.partial_task.done():
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114 return
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115 self.partial_task = asyncio.create_task(
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116 self._transcribe(samples, final=False)
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117 )
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118
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119 def _start_final(self, samples: np.ndarray) -> None:
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120 task = asyncio.create_task(self._transcribe(samples, final=True))
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121 self.final_tasks.add(task)
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122 task.add_done_callback(self.final_tasks.discard)
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123
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124 async def _transcribe(self, samples: np.ndarray, *, final: bool) -> None:
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125 try:
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126 transcript = await self.transcriber.transcribe(
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127 samples,
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128 final=final,
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129 )
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130 if transcript.text:
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131 self.send(
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132 "transcript.final" if final else "transcript.partial",
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133 text=transcript.text,
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134 language=transcript.language,
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135 probability=transcript.probability,
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136 )
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137 if final:
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138 self.send("speech.ended")
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139 except asyncio.CancelledError:
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140 raise
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141 except Exception as error:
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142 self.send(
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143 "error",
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144 code="transcription_failed",
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145 message=str(error),
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146 )
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147
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148 def send(self, event_type: str, **payload: Any) -> None:
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149 if not self.channel or self.channel.readyState != "open":
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150 return
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151 self.channel.send(
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152 json.dumps(
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153 {"type": event_type, **payload},
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154 separators=(",", ":"),
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155 )
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156 )
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157
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158 async def close(self) -> None:
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159 if self.closed:
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160 return
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161 self.closed = True
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162 tasks = [
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163 task
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164 for task in [
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165 self.audio_task,
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166 self.partial_task,
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167 *self.final_tasks,
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168 ]
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169 if task is not None and not task.done()
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MrJuneJune <me@mrjunejune.com>
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170 ]
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171 for task in tasks:
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172 task.cancel()
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173 if tasks:
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174 await asyncio.gather(*tasks, return_exceptions=True)
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175 if self.channel and self.channel.readyState != "closed":
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176 self.channel.close()
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177 await self.peer.close()