1e1911995f
scribe_v2_realtime annotates background audio as *Störgeräusche*, *Fernsehgeräusche* etc. Override stt_node to drop these so the LLM only receives actual speech transcripts. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
669 lines
32 KiB
Python
669 lines
32 KiB
Python
"""Voice session: LiveKit + STT/LLM/TTS pipeline.
|
||
E2EE via HKDF key derivation (Element Call compatible).
|
||
Requires patched livekit-rtc FFI binary from onestacked/livekit-rust-sdks."""
|
||
import asyncio
|
||
import base64
|
||
import datetime
|
||
import hashlib
|
||
import logging
|
||
import os
|
||
|
||
import zoneinfo
|
||
|
||
import json
|
||
import re
|
||
|
||
import aiohttp
|
||
import httpx
|
||
from livekit import rtc, api as lkapi
|
||
from livekit.agents import Agent, AgentSession, function_tool, room_io
|
||
from livekit.plugins import openai as lk_openai, elevenlabs, silero
|
||
from openai import AsyncOpenAI
|
||
|
||
logger = logging.getLogger("matrix-ai-voice")
|
||
|
||
|
||
LITELLM_URL = os.environ.get("LITELLM_BASE_URL", "")
|
||
LITELLM_KEY = os.environ.get("LITELLM_API_KEY", "not-needed")
|
||
LK_API_KEY = os.environ.get("LIVEKIT_API_KEY", "")
|
||
LK_API_SECRET = os.environ.get("LIVEKIT_API_SECRET", "")
|
||
ELEVENLABS_KEY = os.environ.get("ELEVENLABS_API_KEY", "")
|
||
BRAVE_API_KEY = os.environ.get("BRAVE_API_KEY", "")
|
||
MEMORY_SERVICE_URL = os.environ.get("MEMORY_SERVICE_URL", "http://memory-service:8090")
|
||
DEFAULT_VOICE_ID = "JBFqnCBsd6RMkjVDRZzb" # George - warm, British male, multilingual
|
||
|
||
_VOICE_PROMPT_TEMPLATE = """Du bist ein hilfreicher Sprachassistent in einem Matrix-Anruf.
|
||
Aktuelle Zeit: {datetime}
|
||
|
||
STRIKTE Regeln:
|
||
- Antworte in der Sprache des Nutzers (Deutsch oder Englisch)
|
||
- Halte JEDE Antwort auf MAXIMAL 1-2 kurze Saetze
|
||
- Sei direkt und praezise, keine Fuellwoerter
|
||
- Erfinde NICHTS - keine Geschichten, keine Musik, keine Fantasie
|
||
- Beantworte nur was gefragt wird
|
||
- Wenn niemand etwas fragt, sage nur kurz Hallo"""
|
||
|
||
|
||
def _build_voice_prompt() -> str:
|
||
tz_name = os.environ.get("VOICE_TIMEZONE", "Europe/Berlin")
|
||
try:
|
||
tz = zoneinfo.ZoneInfo(tz_name)
|
||
except Exception:
|
||
tz = datetime.timezone.utc
|
||
now = datetime.datetime.now(tz)
|
||
return _VOICE_PROMPT_TEMPLATE.format(
|
||
datetime=now.strftime("%A, %d. %B %Y %H:%M %Z")
|
||
)
|
||
|
||
# ElevenLabs scribe_v2_realtime annotates non-speech audio as *Geräusch* etc.
|
||
# Filter these out so the LLM never sees them.
|
||
_NOISE_ANNOTATION_RE = re.compile(r'^\*[^*]+\*$')
|
||
|
||
class _VoiceAgent(Agent):
|
||
async def stt_node(self, audio, model_settings):
|
||
from livekit.agents import stt as lk_stt
|
||
result = Agent.default.stt_node(self, audio, model_settings)
|
||
if asyncio.iscoroutine(result):
|
||
result = await result
|
||
if result is None:
|
||
return
|
||
async for event in result:
|
||
if isinstance(event, lk_stt.SpeechEvent):
|
||
alts = getattr(event, 'alternatives', None)
|
||
if alts and _NOISE_ANNOTATION_RE.match(alts[0].text.strip()):
|
||
logger.debug("STT noise filtered: %s", alts[0].text)
|
||
continue
|
||
elif isinstance(event, str) and _NOISE_ANNOTATION_RE.match(event.strip()):
|
||
logger.debug("STT noise filtered: %s", event)
|
||
continue
|
||
yield event
|
||
|
||
|
||
_vad = None
|
||
def _get_vad():
|
||
global _vad
|
||
if _vad is None:
|
||
_vad = silero.VAD.load(
|
||
activation_threshold=0.75,
|
||
min_speech_duration=0.2,
|
||
min_silence_duration=0.55,
|
||
)
|
||
return _vad
|
||
|
||
def _make_lk_identity(user_id, device_id):
|
||
return f"{user_id}:{device_id}"
|
||
|
||
def _compute_lk_room_name(room_id):
|
||
raw = f"{room_id}|m.call#ROOM"
|
||
return base64.b64encode(hashlib.sha256(raw.encode()).digest()).decode().rstrip("=")
|
||
|
||
def _generate_lk_jwt(room_id, user_id, device_id):
|
||
identity = _make_lk_identity(user_id, device_id)
|
||
lk_room = _compute_lk_room_name(room_id)
|
||
token = (
|
||
lkapi.AccessToken(LK_API_KEY, LK_API_SECRET)
|
||
.with_identity(identity)
|
||
.with_name(user_id)
|
||
.with_grants(lkapi.VideoGrants(
|
||
room_join=True, room=lk_room,
|
||
can_publish=True, can_subscribe=True))
|
||
.with_ttl(datetime.timedelta(hours=24))
|
||
)
|
||
logger.info("JWT: identity=%s room=%s", identity, lk_room)
|
||
return token.to_jwt()
|
||
|
||
|
||
KDF_HKDF = 1 # Rust FFI applies HKDF internally (proto enum value 1)
|
||
# NOTE: value 0 in the proto is PBKDF2, NOT raw/none mode — see e2ee_patch.py
|
||
|
||
|
||
def _hkdf_derive(ikm: bytes) -> bytes:
|
||
"""Pre-derive AES key via HKDF-SHA256 matching livekit-client-sdk-js deriveEncryptionKey().
|
||
|
||
JS params: hash=SHA-256, salt=encode("LKFrameEncryptionKey"), info=ArrayBuffer(128), length=128bit
|
||
We set this pre-derived key via set_shared_key() which bypasses Rust FFI KDF entirely.
|
||
"""
|
||
import hmac
|
||
salt = b"LKFrameEncryptionKey"
|
||
info = b"\x00" * 128
|
||
prk = hmac.new(salt, ikm, hashlib.sha256).digest()
|
||
t1 = hmac.new(prk, info + b"\x01", hashlib.sha256).digest()
|
||
return t1[:16]
|
||
|
||
|
||
def _ratchet_keys(base_raw: bytes, count: int = 6) -> dict[int, bytes]:
|
||
"""Pre-compute ratcheted keys 0..count-1 matching livekit-client-sdk-js ratchet().
|
||
|
||
EC JS ratchet: new_raw = HMAC(key=current_raw, data="LKFrameEncryptionKey")[:16]
|
||
Returns {index: raw_key} for all indices 0..count-1.
|
||
Set these via set_key(identity, raw, index) with KDF_HKDF=1 so Rust applies HKDF.
|
||
"""
|
||
import hmac as _hmac
|
||
keys = {}
|
||
raw = base_raw
|
||
for i in range(count):
|
||
keys[i] = raw
|
||
raw = _hmac.new(raw, b"LKFrameEncryptionKey", hashlib.sha256).digest()[:16]
|
||
return keys
|
||
|
||
|
||
async def _brave_search(query: str, count: int = 5) -> str:
|
||
"""Call Brave Search API and return formatted results."""
|
||
if not BRAVE_API_KEY:
|
||
return "Search unavailable (no API key configured)."
|
||
try:
|
||
async with httpx.AsyncClient(timeout=10.0) as client:
|
||
resp = await client.get(
|
||
"https://api.search.brave.com/res/v1/web/search",
|
||
headers={"Accept": "application/json", "X-Subscription-Token": BRAVE_API_KEY},
|
||
params={"q": query, "count": count, "text_decorations": False},
|
||
)
|
||
resp.raise_for_status()
|
||
data = resp.json()
|
||
results = data.get("web", {}).get("results", [])
|
||
if not results:
|
||
return "No results found."
|
||
lines = []
|
||
for r in results[:count]:
|
||
lines.append(f"- {r.get('title', '')}: {r.get('description', '')} ({r.get('url', '')})")
|
||
return "\n".join(lines)
|
||
except Exception as exc:
|
||
logger.warning("Brave search error: %s", exc)
|
||
return f"Search failed: {exc}"
|
||
|
||
|
||
async def _extract_voice_memories(user_text: str, agent_text: str,
|
||
user_id: str, room_id: str) -> None:
|
||
"""Extract memorable facts from a voice exchange and store them."""
|
||
if not LITELLM_URL or not MEMORY_SERVICE_URL:
|
||
return
|
||
try:
|
||
# Fetch existing facts to avoid duplicates
|
||
async with httpx.AsyncClient(timeout=10.0) as client:
|
||
resp = await client.post(
|
||
f"{MEMORY_SERVICE_URL}/memories/query",
|
||
json={"user_id": user_id, "query": "all facts", "top_k": 20},
|
||
)
|
||
existing = [m["fact"] for m in resp.json().get("results", [])] if resp.is_success else []
|
||
|
||
existing_text = "\n".join(f"- {f}" for f in existing) if existing else "(none)"
|
||
llm = AsyncOpenAI(base_url=LITELLM_URL, api_key=LITELLM_KEY)
|
||
resp = await llm.chat.completions.create(
|
||
model="claude-haiku",
|
||
messages=[
|
||
{"role": "system", "content": (
|
||
"Extract memorable facts about the user from this voice conversation snippet. "
|
||
"Return a JSON array of concise strings. Include: name, preferences, location, "
|
||
"occupation, interests, family, projects. Skip duplicate or temporary info. "
|
||
"Return [] if nothing new."
|
||
)},
|
||
{"role": "user", "content": (
|
||
f"Existing memories:\n{existing_text}\n\n"
|
||
f"User said: {user_text}\nAssistant replied: {agent_text}\n\n"
|
||
"New facts (JSON array):"
|
||
)},
|
||
],
|
||
max_tokens=200,
|
||
)
|
||
raw = resp.choices[0].message.content.strip()
|
||
if raw.startswith("```"):
|
||
raw = re.sub(r"^```\w*\n?", "", raw)
|
||
raw = re.sub(r"\n?```$", "", raw)
|
||
match = re.search(r"\[.*\]", raw, re.DOTALL)
|
||
if match:
|
||
raw = match.group(0)
|
||
new_facts = json.loads(raw)
|
||
if not isinstance(new_facts, list):
|
||
return
|
||
async with httpx.AsyncClient(timeout=10.0) as client:
|
||
for fact in new_facts:
|
||
if isinstance(fact, str) and fact.strip():
|
||
await client.post(
|
||
f"{MEMORY_SERVICE_URL}/memories/store",
|
||
json={"user_id": user_id, "fact": fact.strip(), "source_room": room_id},
|
||
)
|
||
logger.info("Memory stored for %s: %s", user_id, fact[:80])
|
||
except Exception as exc:
|
||
logger.warning("Voice memory extraction failed: %s", exc)
|
||
|
||
|
||
def _build_e2ee_options() -> rtc.E2EEOptions:
|
||
"""Build E2EE options — let Rust FFI apply HKDF internally (KDF_HKDF=1).
|
||
|
||
Pass raw base keys from Matrix key exchange events directly to set_key().
|
||
The Rust FFI derives the AES frame key via HKDF(base_key, ratchetSalt, ...) internally.
|
||
Element Call uses: ratchetWindowSize=10, keyringSize=256, ratchetSalt="LKFrameEncryptionKey"
|
||
NOTE: proto value 0 = PBKDF2 (not raw/none) — must use KDF_HKDF=1.
|
||
"""
|
||
key_opts = rtc.KeyProviderOptions(
|
||
shared_key=b"", # empty = per-participant mode
|
||
ratchet_window_size=10,
|
||
ratchet_salt=b"LKFrameEncryptionKey",
|
||
failure_tolerance=10,
|
||
key_ring_size=256,
|
||
key_derivation_function=KDF_HKDF, # Rust FFI applies HKDF; we pass raw base keys
|
||
)
|
||
return rtc.E2EEOptions(key_provider_options=key_opts)
|
||
|
||
|
||
class VoiceSession:
|
||
def __init__(self, nio_client, room_id, device_id, lk_url, model="claude-sonnet",
|
||
publish_key_cb=None, bot_key: bytes | None = None,
|
||
memory=None, caller_user_id: str | None = None):
|
||
self.nio_client = nio_client
|
||
self.room_id = room_id
|
||
self.device_id = device_id
|
||
self.lk_url = lk_url
|
||
self.model = model
|
||
self.lk_room = None
|
||
self.session = None
|
||
self._task = None
|
||
self._http_session = None
|
||
self._caller_key: bytes | None = None
|
||
self._caller_identity: str | None = None
|
||
self._caller_all_keys: dict = {} # {index: bytes} — all caller keys by index
|
||
self._bot_key: bytes = bot_key or os.urandom(16)
|
||
self._publish_key_cb = publish_key_cb
|
||
self._memory = memory # MemoryClient instance from bot.py
|
||
self._caller_user_id = caller_user_id # Matrix user ID for memory lookup
|
||
|
||
def on_encryption_key(self, sender, device_id, key, index):
|
||
"""Receive E2EE key from Element Call participant."""
|
||
if not key:
|
||
return
|
||
if not self._caller_key:
|
||
self._caller_key = key
|
||
self._caller_identity = f"{sender}:{device_id}"
|
||
# Pre-compute ratcheted keys from this base key to cover EC's key rotation.
|
||
# EC rotates (via HMAC ratchet) when new participants join — the rotated key
|
||
# arrives via Matrix sync with ~30s delay. Setting ratcheted indices 0..N
|
||
# proactively means decryption works immediately without waiting for Matrix.
|
||
ratcheted = _ratchet_keys(key, count=8)
|
||
for ridx, rkey in ratcheted.items():
|
||
actual_idx = index + ridx
|
||
if actual_idx not in self._caller_all_keys: # don't overwrite real received keys
|
||
self._caller_all_keys[actual_idx] = rkey
|
||
self._caller_all_keys[index] = key # always store the real key at its index
|
||
logger.info("E2EE key received from %s:%s (index=%d, %d bytes) — pre-computed ratchets [%d..%d]",
|
||
sender, device_id, index, len(key), index, index + 7)
|
||
# Live-update key on rotation — use set_key() which applies HKDF via Rust FFI.
|
||
# At this point the track is usually already subscribed so frame cryptor exists.
|
||
if self.lk_room and self._caller_identity:
|
||
caller_lk_id = self._caller_identity # e.g. "@user:server.eu:DEVICEID"
|
||
for p in self.lk_room.remote_participants.values():
|
||
if p.identity == caller_lk_id:
|
||
try:
|
||
kp = self.lk_room.e2ee_manager.key_provider
|
||
ok = kp.set_key(p.identity, key, index)
|
||
logger.info("Live-updated set_key[%d] for %s (ok=%s, %d bytes)",
|
||
index, p.identity, ok, len(key))
|
||
except Exception as e:
|
||
logger.warning("Failed to live-update caller key: %s", e)
|
||
break
|
||
|
||
async def _fetch_encryption_key_http(self) -> bytes | None:
|
||
"""Fetch encryption key from room timeline (NOT state) via Matrix HTTP API.
|
||
|
||
Element Call distributes encryption keys as timeline events, not state.
|
||
"""
|
||
import httpx
|
||
homeserver = str(self.nio_client.homeserver)
|
||
token = self.nio_client.access_token
|
||
url = f"{homeserver}/_matrix/client/v3/rooms/{self.room_id}/messages"
|
||
try:
|
||
async with httpx.AsyncClient(timeout=10.0) as http:
|
||
resp = await http.get(
|
||
url,
|
||
headers={"Authorization": f"Bearer {token}"},
|
||
params={"dir": "b", "limit": "50"},
|
||
)
|
||
resp.raise_for_status()
|
||
data = resp.json()
|
||
events = data.get("chunk", [])
|
||
user_id = self.nio_client.user_id
|
||
for evt in events:
|
||
evt_type = evt.get("type", "")
|
||
if evt_type == "io.element.call.encryption_keys":
|
||
sender = evt.get("sender", "")
|
||
if sender == user_id:
|
||
continue # skip our own key
|
||
content = evt.get("content", {})
|
||
device = content.get("device_id", "")
|
||
logger.info("Found encryption_keys timeline event: sender=%s device=%s",
|
||
sender, device)
|
||
all_keys = {}
|
||
import base64 as b64
|
||
for k in content.get("keys", []):
|
||
key_b64 = k.get("key", "")
|
||
key_index = k.get("index", 0)
|
||
if key_b64:
|
||
key_b64 += "=" * (-len(key_b64) % 4)
|
||
key_bytes = b64.urlsafe_b64decode(key_b64)
|
||
all_keys[key_index] = key_bytes
|
||
if all_keys:
|
||
if device:
|
||
self._caller_identity = f"{sender}:{device}"
|
||
self._caller_all_keys.update(all_keys)
|
||
max_idx = max(all_keys.keys())
|
||
logger.info("Loaded caller keys at indices %s (using %d)",
|
||
sorted(all_keys.keys()), max_idx)
|
||
return all_keys[max_idx]
|
||
logger.info("No encryption_keys events in last %d timeline events", len(events))
|
||
except Exception as e:
|
||
logger.warning("HTTP encryption key fetch failed: %s", e)
|
||
return None
|
||
|
||
async def start(self):
|
||
self._task = asyncio.create_task(self._run())
|
||
|
||
async def stop(self):
|
||
for obj in [self.session, self.lk_room, self._http_session]:
|
||
if obj:
|
||
try:
|
||
if hasattr(obj, "aclose"):
|
||
await obj.aclose()
|
||
elif hasattr(obj, "disconnect"):
|
||
await obj.disconnect()
|
||
elif hasattr(obj, "close"):
|
||
await obj.close()
|
||
except Exception:
|
||
pass
|
||
if self._task and not self._task.done():
|
||
self._task.cancel()
|
||
try:
|
||
await self._task
|
||
except asyncio.CancelledError:
|
||
pass
|
||
|
||
async def _run(self):
|
||
try:
|
||
user_id = self.nio_client.user_id
|
||
bot_identity = _make_lk_identity(user_id, self.device_id)
|
||
jwt = _generate_lk_jwt(self.room_id, user_id, self.device_id)
|
||
|
||
# Publish bot's own key immediately so Element Call can decrypt us
|
||
if self._publish_key_cb:
|
||
self._publish_key_cb(self._bot_key)
|
||
logger.info("Published bot E2EE key (%d bytes)", len(self._bot_key))
|
||
|
||
# Check timeline for caller's encryption key
|
||
caller_key = await self._fetch_encryption_key_http()
|
||
if caller_key:
|
||
self._caller_key = caller_key
|
||
logger.info("Got caller E2EE key via timeline (%d bytes)", len(caller_key))
|
||
|
||
if not self._caller_key:
|
||
# Wait up to 15s for key via sync handler
|
||
logger.info("No key in timeline yet, waiting for sync...")
|
||
for _ in range(150):
|
||
if self._caller_key:
|
||
break
|
||
await asyncio.sleep(0.1)
|
||
|
||
# E2EE: re-enabled after diagnostic confirmed EC encrypts audio.
|
||
# Root cause found: set_key() only applies HKDF if the frame cryptor for that
|
||
# participant already exists. Must call set_key() in on_track_subscribed, not at connect time.
|
||
key_opts = rtc.KeyProviderOptions(
|
||
shared_key=b"", # per-participant mode
|
||
ratchet_window_size=16,
|
||
ratchet_salt=b"LKFrameEncryptionKey",
|
||
failure_tolerance=-1,
|
||
key_ring_size=16,
|
||
key_derivation_function=KDF_HKDF, # Rust applies HKDF matching EC JS SDK
|
||
)
|
||
e2ee_opts = rtc.E2EEOptions(
|
||
encryption_type=rtc.EncryptionType.GCM,
|
||
key_provider_options=key_opts,
|
||
)
|
||
room_opts = rtc.RoomOptions(e2ee=e2ee_opts)
|
||
self.lk_room = rtc.Room()
|
||
|
||
@self.lk_room.on("participant_connected")
|
||
def on_p(p):
|
||
logger.info("Participant connected: %s", p.identity)
|
||
# Note: do NOT set keys here — frame cryptor not initialized yet at participant_connected.
|
||
# Keys are set in on_track_subscribed where the frame cryptor definitely exists.
|
||
|
||
@self.lk_room.on("track_published")
|
||
def on_tp(pub, p):
|
||
logger.info("Track pub: %s %s kind=%s", p.identity, pub.sid, pub.kind)
|
||
|
||
@self.lk_room.on("track_muted")
|
||
def on_mute(pub, p):
|
||
logger.info("Track MUTED: %s %s kind=%s", p.identity, pub.sid, pub.kind)
|
||
|
||
@self.lk_room.on("track_unmuted")
|
||
def on_unmute(pub, p):
|
||
logger.info("Track UNMUTED: %s %s kind=%s", p.identity, pub.sid, pub.kind)
|
||
|
||
@self.lk_room.on("track_subscribed")
|
||
def on_ts(t, pub, p):
|
||
logger.info("Track sub: %s %s kind=%s muted=%s", p.identity, pub.sid, t.kind, pub.muted)
|
||
# Start audio frame counter for this track to confirm data flows
|
||
if int(t.kind) == 1:
|
||
async def _count_frames(track=t, pid=p.identity):
|
||
try:
|
||
audio_stream = rtc.AudioStream(track)
|
||
count = 0
|
||
async for _ in audio_stream:
|
||
count += 1
|
||
if count == 1:
|
||
logger.info("AUDIO_FLOW: first frame from %s (E2EE OK)", pid)
|
||
elif count % 1000 == 0:
|
||
logger.info("AUDIO_FLOW: %d frames from %s", count, pid)
|
||
except Exception as exc:
|
||
logger.warning("AUDIO_FLOW monitor error: %s", exc)
|
||
asyncio.ensure_future(_count_frames())
|
||
# *** KEY FIX: set_key() with KDF_HKDF only applies HKDF when the frame cryptor
|
||
# for this participant already exists. The frame cryptor is created at track
|
||
# subscription time. Calling set_key() BEFORE track subscription (at connect)
|
||
# skips HKDF derivation → raw key stored → DEC_FAILED.
|
||
# Solution: set caller key HERE, after frame cryptor is initialized.
|
||
if int(t.kind) == 1 and e2ee_opts is not None: # audio track only
|
||
caller_id = p.identity
|
||
try:
|
||
kp_local = self.lk_room.e2ee_manager.key_provider
|
||
if self._caller_all_keys:
|
||
for idx, base_k in sorted(self._caller_all_keys.items()):
|
||
ok = kp_local.set_key(caller_id, base_k, idx)
|
||
logger.info("on_ts: set_key[%d] for %s (ok=%s, %d bytes)",
|
||
idx, caller_id, ok, len(base_k))
|
||
else:
|
||
logger.warning("on_ts: no caller keys available yet")
|
||
except Exception as exc:
|
||
logger.warning("on_ts: set_key failed: %s", exc)
|
||
# Delayed retry — frame cryptor may not be ready at track_subscribed time
|
||
async def _delayed_set_key(pid=caller_id):
|
||
await asyncio.sleep(1.0)
|
||
try:
|
||
kp_d = self.lk_room.e2ee_manager.key_provider
|
||
if self._caller_all_keys:
|
||
for idx, base_k in sorted(self._caller_all_keys.items()):
|
||
ok = kp_d.set_key(pid, base_k, idx)
|
||
logger.info("on_ts_delayed: set_key[%d] for %s (ok=%s, %d bytes)",
|
||
idx, pid, ok, len(base_k))
|
||
except Exception as exc:
|
||
logger.warning("on_ts_delayed: set_key failed: %s", exc)
|
||
asyncio.ensure_future(_delayed_set_key())
|
||
|
||
_e2ee_state_names = {0:"NEW",1:"OK",2:"ENC_FAILED",3:"DEC_FAILED",4:"MISSING_KEY",5:"RATCHETED",6:"INTERNAL_ERR"}
|
||
@self.lk_room.on("e2ee_state_changed")
|
||
def on_e2ee_state(participant, state):
|
||
state_name = _e2ee_state_names.get(int(state), f"UNKNOWN_{state}")
|
||
p_id = participant.identity if participant else "local"
|
||
logger.info("E2EE_STATE: participant=%s state=%s", p_id, state_name)
|
||
# When remote participant frame cryptor is NEW or MISSING_KEY → set their key
|
||
if participant and p_id != bot_identity and int(state) in (0, 4):
|
||
if self._caller_all_keys:
|
||
try:
|
||
kp_e = self.lk_room.e2ee_manager.key_provider
|
||
for idx, base_k in sorted(self._caller_all_keys.items()):
|
||
ok = kp_e.set_key(p_id, base_k, idx)
|
||
logger.info("e2ee_state set_key[%d] for %s (ok=%s)", idx, p_id, ok)
|
||
except Exception as exc:
|
||
logger.warning("e2ee_state set_key failed: %s", exc)
|
||
|
||
await self.lk_room.connect(self.lk_url, jwt, options=room_opts)
|
||
logger.info("Connected (E2EE=HKDF), remote=%d",
|
||
len(self.lk_room.remote_participants))
|
||
|
||
# Set bot's own key immediately after connect — local frame cryptor exists at connect time.
|
||
# CALLER keys are set in on_track_subscribed (NOT here) because the caller's frame cryptor
|
||
# is only created when their track arrives. Calling set_key() before that skips HKDF.
|
||
kp = self.lk_room.e2ee_manager.key_provider
|
||
ok = kp.set_key(bot_identity, self._bot_key, 0)
|
||
logger.info("Set bot key for %s (ok=%s, %d bytes)", bot_identity, ok, len(self._bot_key))
|
||
|
||
# Element Call rotates its encryption key when bot joins the LiveKit room.
|
||
# EC sends the new key via Matrix (Megolm-encrypted); nio sync will decrypt it
|
||
# and call on_encryption_key(), which updates self._caller_all_keys.
|
||
# NOTE: HTTP fetch is useless here — keys are Matrix-E2EE encrypted (m.room.encrypted).
|
||
pre_max_idx = max(self._caller_all_keys.keys()) if self._caller_all_keys else -1
|
||
logger.info("Waiting for EC key rotation via nio sync (current max_idx=%d)...", pre_max_idx)
|
||
for _attempt in range(4): # up to 2s (4 × 0.5s)
|
||
await asyncio.sleep(0.5)
|
||
new_max = max(self._caller_all_keys.keys()) if self._caller_all_keys else -1
|
||
if new_max > pre_max_idx:
|
||
self._caller_key = self._caller_all_keys[new_max]
|
||
logger.info("Key rotated: index %d→%d (%d bytes)",
|
||
pre_max_idx, new_max, len(self._caller_key))
|
||
break
|
||
if _attempt % 2 == 1: # log every 1s
|
||
logger.info("Key rotation wait %0.1fs: max_idx still %d", (_attempt + 1) * 0.5, new_max)
|
||
else:
|
||
logger.warning("No key rotation after 2s — using pre-join key[%d]", pre_max_idx)
|
||
|
||
# Find the remote participant, wait up to 10s if not yet connected
|
||
remote_identity = None
|
||
for p in self.lk_room.remote_participants.values():
|
||
remote_identity = p.identity
|
||
break
|
||
if not remote_identity:
|
||
logger.info("No remote participant yet, waiting...")
|
||
for _ in range(100):
|
||
await asyncio.sleep(0.1)
|
||
for p in self.lk_room.remote_participants.values():
|
||
remote_identity = p.identity
|
||
break
|
||
if remote_identity:
|
||
break
|
||
|
||
# Set shared_key with pre-derived AES key for caller decryption.
|
||
# NOT using set_key() for caller — Rust HKDF may produce different result than EC's JS HKDF.
|
||
# set_shared_key() stores key raw (no KDF applied) — we pre-derive in Python.
|
||
# After key rotation wait: if track already subscribed, set rotated key.
|
||
# (Usually on_track_subscribed handles this, but if track arrived before rotation,
|
||
# the rotated key needs to be set here for the already-subscribed participant.)
|
||
if self._caller_all_keys and remote_identity:
|
||
try:
|
||
for idx, base_k in sorted(self._caller_all_keys.items()):
|
||
ok = kp.set_key(remote_identity, base_k, idx)
|
||
logger.info("Post-rotation set_key[%d] for %s (ok=%s)",
|
||
idx, remote_identity, ok)
|
||
except Exception as e:
|
||
logger.warning("Post-rotation set_key failed: %s", e)
|
||
elif not self._caller_all_keys:
|
||
logger.warning("No caller E2EE keys received — incoming audio will be silence")
|
||
|
||
if remote_identity:
|
||
logger.info("Linking to remote participant: %s", remote_identity)
|
||
|
||
# Load memories for this caller
|
||
memory_section = ""
|
||
if self._memory and self._caller_user_id:
|
||
try:
|
||
mems = await self._memory.query(self._caller_user_id, "voice call", top_k=10)
|
||
if mems:
|
||
memory_section = "\n\nKontext aus früheren Gesprächen mit diesem Nutzer:\n" + \
|
||
"\n".join(f"- {m['fact']}" for m in mems)
|
||
logger.info("Loaded %d memories for %s", len(mems), self._caller_user_id)
|
||
except Exception as exc:
|
||
logger.warning("Memory query failed: %s", exc)
|
||
|
||
# Voice pipeline — George (British male, multilingual DE/EN)
|
||
self._http_session = aiohttp.ClientSession()
|
||
voice_id = os.environ.get("ELEVENLABS_VOICE_ID", DEFAULT_VOICE_ID)
|
||
self.session = AgentSession(
|
||
stt=elevenlabs.STT(
|
||
api_key=ELEVENLABS_KEY,
|
||
model_id="scribe_v2_realtime",
|
||
language_code=os.environ.get("STT_LANGUAGE", "de"),
|
||
http_session=self._http_session,
|
||
),
|
||
llm=lk_openai.LLM(base_url=LITELLM_URL, api_key=LITELLM_KEY, model=self.model),
|
||
tts=elevenlabs.TTS(voice_id=voice_id, model="eleven_multilingual_v2",
|
||
api_key=ELEVENLABS_KEY, http_session=self._http_session),
|
||
vad=_get_vad(),
|
||
)
|
||
|
||
# Pipeline event logging (livekit-agents 1.4.2 event names)
|
||
@self.session.on("user_state_changed")
|
||
def _on_user_state(ev):
|
||
logger.info("VAD: user_state=%s", ev.new_state)
|
||
|
||
_last_user_speech: list[str] = []
|
||
|
||
@self.session.on("user_input_transcribed")
|
||
def _on_user_speech(ev):
|
||
logger.info("USER_SPEECH: %s", ev.transcript)
|
||
if ev.transcript:
|
||
_last_user_speech.append(ev.transcript)
|
||
|
||
@self.session.on("conversation_item_added")
|
||
def _on_conversation_item(ev):
|
||
role = getattr(ev.item, "role", "?")
|
||
text = getattr(ev.item, "text_content", "") or ""
|
||
if role == "assistant" and text:
|
||
logger.info("AGENT_SPEECH: %s", text)
|
||
if self._memory and self._caller_user_id and _last_user_speech:
|
||
user_text = " ".join(_last_user_speech)
|
||
_last_user_speech.clear()
|
||
asyncio.ensure_future(
|
||
_extract_voice_memories(user_text, text,
|
||
self._caller_user_id, self.room_id))
|
||
|
||
# Brave Search tool — lets the agent answer questions about current events
|
||
@function_tool
|
||
async def search_web(query: str) -> str:
|
||
"""Search the web for current information using Brave Search.
|
||
|
||
Use this when asked about recent news, current events, prices,
|
||
weather, or any information that may have changed recently.
|
||
"""
|
||
logger.info("SEARCH: %s", query)
|
||
result = await _brave_search(query)
|
||
logger.info("SEARCH_RESULT: %s", result[:200])
|
||
return result
|
||
|
||
agent = _VoiceAgent(
|
||
instructions=_build_voice_prompt() + memory_section,
|
||
tools=[search_web],
|
||
)
|
||
io_opts = room_io.RoomOptions(
|
||
participant_identity=remote_identity,
|
||
close_on_disconnect=False,
|
||
) if remote_identity else room_io.RoomOptions(close_on_disconnect=False)
|
||
await self.session.start(
|
||
agent=agent,
|
||
room=self.lk_room,
|
||
room_options=io_opts,
|
||
)
|
||
logger.info("Voice pipeline started (voice=%s, linked_to=%s)", voice_id, remote_identity)
|
||
|
||
try:
|
||
await asyncio.wait_for(
|
||
self.session.generate_reply(
|
||
instructions="Sage nur: Hallo, wie kann ich helfen?"),
|
||
timeout=30.0)
|
||
logger.info("Greeting sent")
|
||
except asyncio.TimeoutError:
|
||
logger.error("Greeting timed out")
|
||
|
||
while True:
|
||
await asyncio.sleep(5)
|
||
|
||
except asyncio.CancelledError:
|
||
logger.info("Session cancelled for %s", self.room_id)
|
||
except Exception:
|
||
logger.exception("Session failed for %s", self.room_id)
|