**Inspecting app components** I’ve found the app, and now I need to inspect it. It seems like there might be a dashboard on the site, which could contain useful information. I should read through the files to locate the HTML, possibly embedded in Python. I'll use the grep command specifically to search for "recording" in the /opt/conversation-sip directory. This should help me narrow down what I'm looking for!
**Reviewing documentation sections** I need to dive into the relevant sections, specifically 260-399, which covers WavWriter merging. It seems crucial for where I’m headed. I also should check out section 1019 onwards to look into how handle_gemini is discussed, and of course, the status page is important too. So, the plan here is to carefully go through these sections to ensure I have a clear understanding of all necessary details!
**Investigating runtime state** I'm looking into the runtime state and logs, and I might need to run commands using Bash, like `systemctl` and `journalctl`. I think I should avoid using `cat` for reading files, but I can use `read` for directories instead. Checking the recordings and their status sounds crucial, so I could use `webfetch` on localhost for that, as well as `curl` for the status URL. I need to be cautious about the environment settings and working directory, which is `/opt/conversation-sip`.
**Exploring response issues** I'm considering how to handle situations where Gemini is about to respond but the caller speaks up. A barge-in feature should cancel the assistant and start a new session if there’s no response, but I want to implement this in a minimal way. The user mentions they can’t hear the Gemini agent, even though there’s data logged. I think I need to explore the audio status tracking and how the output queue handles chunks, as it seems some are being dropped if the queue is full. I need to understand more about whether the caller can hear anything at all.
**Evaluating audio processing needs** I’m thinking about making some improvements for the audio information, like adding RMS and peak values to the wav_info, and displaying a "silent" status. I’m also considering a warning for when the track isn't aligned due to differing durations. The user wants to investigate and maybe fix the mismatch. I need to check the VAD thresholds since false positives could be an issue, particularly if the caller's audio has DTMF sounds. It seems like I might need to calculate RMS per second to analyze speech segments better.
**Considering VAD environment updates** I’ve noticed that the existing VAD environment only utilizes `os.environ`, but the `run.sh` script exports the `.env` before executing, so that seems fine. I’m thinking about possibly adding `RECORDING_SILENCE_RMS_THRESHOLD = 25`. Also, for the `WavWriter`, I need to ensure that `bytes_written` is thread-safe, and I could potentially use that in the padding process. It’s crucial to address these details for smooth operation!
**Looking into patching wav_info/display** I need to figure out how to patch the wav_info/display. It seems like there’s a specific issue I need to address, so I'm considering what kind of changes or fixes might be necessary. I should probably check the documentation or existing code to ensure I'm on the right track. It's important to ensure that the solution is effective and doesn’t cause other issues in the process. I'll start gathering some details!
**Investigating potential injection** I’m considering the possibility of HTML injection in the recording alignment warning. It looks like I need to examine the difference between the numeric and text constants. I should also check the CSS around line 1480 to get a full picture of any vulnerabilities. There’s definitely some work to do here to ensure everything is secure, so I'll proceed carefully with this investigation!
**Updating service process** I need to update my to-do list, but first, I'm considering inspecting the differences. However, since it's not a git repo, I can’t use `git diff` and should look into options like using `grep` or `bash diff`. It seems like I just need to restart the service with `systemctl restart` to apply the changes, and then verify the status afterward. I'll also check for errors in the service logs using bash.
**Verifying system status** I need to check the system status, so I'll be using a parallel approach with the systemctl commands to get the current status in JSON format. It seems like a good idea to run a web fetch as well to gather any additional necessary data. This should help ensure I have a complete understanding of the system's current state. Alright, let's proceed with that!
**Assessing work progress** I need to get this done soon, but first, let’s check the current work. I’m not sure if I’m in the right git setup. It seems like I might not be. So, I need to update my to-do list with the completed tasks and make sure that verification has been finished. I want to ensure everything is properly sorted out before moving forward!
**Providing implementation details** I need to outline the paths regarding my implementation. I’ve noted that I’ve restarted the `conversation_app.py` file. The root cause of the failure was that the latest call had caller audio but didn't send any Gemini audio, causing timeouts. Now, the no-audio response will unblock if the next caller turn is queued, and I've made several changes for recording and alignment. Verification steps have been completed, and everything seems to be functioning correctly. I’ll also make sure the latest call is displayed accurately without misleading information.
The user wants me to continue with next steps. Looking at the context, I have an in-progress task: "Investigate pipe dying after first response". Let me continue investigating this.
The key clue is:
- `generation_complete_count: 1` (only one response generated)
- `output_chunks: 23` (one response worth of audio)
- `vad_turns: 6` (six user utterances detected)
- `audio_chunks_sent: 126` (audio being sent)
- `last_event: audio_input` (last event was audio input)
- `connected: false` (pipe torn down)
The most likely cause: `asyncio.wait({sender_task, receiver_task}, return_when=FIRST_COMPLETED)` - if either task raises an exception or completes, the other is cancelled. The first `generation_complete` may cause the receiver to complete, or there's an exception being raised.
Let me look at the current state of the file to investigate.Now I have the full context. Let me look at the rest of the file.
Now I can see the full picture. Let me analyze the key issues:
1. **Pipe dying after first response**: In `gemini_pipe_loop` (line 892-943), the code uses `asyncio.wait({sender_task, receiver_task}, return_when=asyncio.FIRST_COMPLETED)`. If EITHER task raises an exception or completes, the OTHER is cancelled.
2. **The "in_progress" investigation**: The pipe dies because:
- The `pipe_sender` doesn't normally complete (it loops `while not self.stop_event.is_set()`).
- The `pipe_receiver` may complete or raise if the connection breaks.
- Even if it doesn't error, the FIRST_COMPLETED semantics means if the receiver loop terminates for any reason (e.g., server closes stream), the sender gets cancelled.
3. **Looking at the user report details**:
- 6 VAD turns but only 1 generation completed
- last_event: `audio_input` (not `generation_complete`)
- `connected: false`
- This suggests the pipe was torn down mid-call
The root cause is likely:
- After first generation completes, the pipe might have hit a state where `receive()` returned (stream ended) or threw an exception
- Since FIRST_COMPLETED cancels the other task, sender is killed too
- This prevents further audio from being sent
- Subsequent VAD turns have nowhere to go
There's actually a more subtle issue. The `gemini_input_queue` is still being filled by the capture_loop (which still runs even after gemini pipe dies), but the sender is dead so audio is never sent. The whole pipe should reconnect and continue.
Wait, looking again at the code: the reconnect logic exists in `gemini_pipe_loop` outer while loop. So if pipe dies, it should reconnect. But the user says "stops working after one message" - so maybe reconnect is failing.
Let me check the actual symptoms more carefully:
- `generation_complete_count: 1` → only 1 successful response
- `audio_chunks_sent: 126` → lots of audio was sent
- `vad_turns: 6` → 6 user utterances detected
- `last_event: audio_input` → last event was audio being sent
- `connected: false` → not connected at end of call
So the pipe died but the status shows the LAST recorded event was `audio_input`. This means sender died but it was the last event to update status. The receiver might have died without setting an error.
Actually, looking at `pipe_receiver`:
```python
async def pipe_receiver(self, session: Any) -> None:
try:
async for message in session.receive():
if self.stop_event.is_set():
break
await self.handle_gemini_message(message)
except Exception as exc:
STATE.update("gemini", last_error=redact(str(exc))[:200], last_event="receive_error")
STATE.event("error", f"session.receive failed: {exc}")
raise
```
The receiver:
1. Catches exceptions
2. Updates last_error/last_event to "receive_error"
3. Re-raises
But we see `last_event: audio_input` and no error. So either:
- The receiver completed normally (no exception, just iterator ended)
- The sender raised an exception but the exception wasn't surfaced
Actually wait - if the receiver completes normally (iterator ends), there's no exception logged. The pipe breaks. Then FIRST_COMPLETED triggers, cancelling the sender. Then we go back to outer reconnect loop.
But where's the `connected: false`? When does `connected` get set to false? Let me check:
- `connected: True` is set when entering the `async with` (line 904)
- `connected: False` is set in `stop()` (line 527) and in error handler (line 935) and `gemini_async` finally
So at end of call, `connected: false` happens in `stop()`. That's expected.
The issue is that after the first response, the pipe dies. Let me look at the audio_chunks_sent count: 126 audio chunks sent. That's about 12.6 seconds of audio. After 12.6s, things stopped working. The first generation took some time. The user said "Gemini only responded once; stopped working after one message; latency should be way less".
The latency complaint suggests the FIRST response was slow. The "stops working after one message" suggests pipe dies after first response.
Let me think about what could cause this:
1. After the model finishes its first turn with `generation_complete`, the server might close the stream or send a `go_away`.
2. With `START_OF_ACTIVITY_INTERRUPTS` mode, the server's `receive()` iterator might end after a generation completes.
3. Then the pipe_die -> FIRST_COMPLETED -> sender cancelled -> outer loop reconnects.
But reconnect should work! Why does it fail? Maybe:
- API key has rate limit
- Server returned go_away
- Something else
Actually, let me reconsider. Looking at `gemini_sender` (old code, lines 983-1044), the old code had `awaiting_generation` and `stream_ended` logic. The new code (`pipe_sender`, lines 945-970) just sends audio and ignores VAD "end" signals. So VAD signals are discarded - good.
But the VAD "start" signal sets `self.seen_audio_for_generation = False` in `update_vad` (line 748). Then if assistant is playing and barge-in happens, `suppress_agent_output = True`. After generation_complete, `suppress_agent_output = False` (line 1097).
OK so the flow should work. Let me look at what might cause the pipe to die.
Wait - here's a thought. The `pipe_receiver` does:
```python
async for message in session.receive():
if self.stop_event.is_set():
break
await self.handle_gemini_message(message)
```
If `session.receive()` returns an iterator that just ends after a turn (which is normal Gemini Live behavior in some versions), then the for loop ends, the receiver returns normally, FIRST_COMPLETED triggers, and we go to outer reconnect.
If this is normal Gemini Live behavior - that the receive stream only has one turn of data and then closes - then we'd reconnect for every single turn. That would be very wasteful and could hit rate limits.
The way to fix this: instead of letting the receiver complete normally, we should keep it alive for the duration of the call. The receiver doesn't need to complete - it can just keep reading from the stream. If the stream naturally ends, that means we need to reconnect.
Looking at how `client.aio.live.connect` is used in the SDK, it should keep the connection open for the entire call. The `receive()` iterator yields multiple `server_content` messages (one per chunk of audio, plus `generation_complete` and `turn_complete`).
The likely issue: when the user goes silent after a long pause, the server might close the receive stream. Or after `generation_complete` the stream might be considered "ended" from the server's perspective.
Let me check what version of `google-genai` is installed and what the actual receive() behavior is.
Actually, a more practical approach: let me run a test and see what happens. Let me check the live journal and status first to understand current state.
Let me also think about the user's report: "latency should be way less". This means the response was slow, not just that it stopped working. So:
1. First response: slow
2. After first response: pipe dies
Could the latency be due to the long `prefix_padding_ms=100` and the VAD waiting for `VAD_SILENCE_DEBOUNCE=1.0` + `VAD_HOLD_CHUNKS=10` (10*100ms=1s) of silence before sending `end` signal? That should be: 1.0s silence debounce + 1s for hold chunks. So minimum 2s before end of turn is detected. Plus 100ms prefix padding. Plus Gemini processing time.
But after the first response, the pipe is dead. So no further responses.
The fix should be:
1. **Don't let the receiver "complete" the pipe**: Add a sentinel or use a different pattern. If the receiver's iterator ends naturally, that's actually a "stream ended" signal - but we don't want to tear down the whole session.
2. **Better reconnect logic**: If pipe dies, the outer loop should reconnect and continue, but the audio_chunks_sent keeps increasing. The 126 chunks were sent before the pipe died, but after that nothing more gets through.
Wait, audio_chunks_sent is 126 - that's 12.6 seconds of audio. But there were 6 VAD turns. Each VAD turn has 1.0s of preroll + some speech + 1.0s of debounce + 1.0s of hold = at minimum 3s per turn. 6 turns = 18s. But we only see 12.6s of audio sent. So the last few turns never made it.
OK so the fix is clear: keep the pipe alive. The receiver shouldn't end the pipe.
Let me look at what `asyncio.wait` with `FIRST_COMPLETED` does. When the receiver iterator naturally ends:
- The receiver task completes (returns None)
- `done` set contains the receiver task
- `pending` set contains the sender task
- The sender is cancelled
This is the bug. We need to:
1. NOT use FIRST_COMPLETED to break the pipe
2. Or wrap the receive() in a way that if it ends naturally, we either reconnect (good) or just keep waiting (also ok, since sender is the bottleneck)
Actually the best fix is:
- The receiver should keep running for the entire call
- If `session.receive()` iterator ends, that's a signal to reconnect (or just close and reconnect)
- The sender runs in parallel and doesn't depend on the receiver
So the structure should be:
- One task runs both: keep both alive
- If receiver ends (stream ended), reconnect the whole session
- If sender fails, reconnect too
Actually I think the current code's reconnect logic handles this correctly. The issue is that `audio_chunks_sent: 126` is the final count, meaning we never reconnected. So either:
- The reconnect failed
- The audio stopped being generated by the capture loop
But the capture loop runs in a separate thread, so it shouldn't be affected.
Hmm, let me re-read the issue. The user says "Gemini only responded once; stopped working after one message". So:
- 1 response generated (generation_complete_count: 1)
- After that, no more responses
- 6 VAD turns but only 1 generation
But the audio_chunks_sent = 126. That's 12.6s of audio sent. With 6 VAD turns each having a min of 3s, that's 18s minimum. So only 12.6s of audio was sent across 6 VAD turns. So at some point the audio stopped being sent.
Wait, `audio_chunks_sent` is updated to 126 in the final state. But it's set by `pipe_sender` on each successful send. If sender was cancelled, the count wouldn't update further. So 126 is the count when the sender was cancelled.
If sender was cancelled after first response, then audio_chunks_sent would be the count at that point. After that, capture_loop keeps reading from ALSA and putting into `gemini_input_queue`, but the queue fills up and audio is dropped (or the queue is unbounded enough to buffer).
Actually, the queue has `maxsize=1200`. At 100ms per chunk, that's 120s of buffer. So queue won't fill up for 2 minutes.
So the flow is:
1. Call starts, bridge starts
2. Pipe connects
3. First VAD turn, audio sent, response generated
4. Pipe dies (some reason)
5. Sender cancelled, queue keeps filling
6. Other VAD turns happen, audio queued but not sent
7. Call ends
If the pipe died and we never reconnected, that's the bug.
The reconnect logic is:
```python
while not self.stop_event.is_set():
STATE.update("gemini", state="connecting", connected=False, last_event="pipe_connecting")
try:
async with client.aio.live.connect(model=GEMINI_MODEL, config=config) as session:
...
sender_task = asyncio.create_task(...)
receiver_task = asyncio.create_task(...)
done, pending = await asyncio.wait({sender_task, receiver_task}, return_when=asyncio.FIRST_COMPLETED)
...
except Exception as exc:
...
if self.stop_event.is_set():
break
await asyncio.sleep(backoff)
backoff = min(backoff * 2, 8.0)
```
So if the receiver completes normally (not exception), the `try` block doesn't catch anything. The `asyncio.wait` returns. The `async with` block exits. The outer loop continues. We should reconnect.
But... the state shows `connected: false` at end of call. Let me check what `connected` is set to:
- Line 904: `connected=True` (entering session)
- Line 935: `connected=False` (exception in try)
- Line 527: `connected=False` (in stop())
The `state="disconnected"` in stop() is set with `connected=False`. The `last_event` is "audio_input" (from pipe_sender's last update). After that, the receiver completed, FIRST_COMPLETED fired, sender was cancelled. But before sender was cancelled, the LAST event was audio_input.
Wait, actually the sender's last update was audio_input. The receiver completed and set `last_event="setup_complete"` initially, but when it completed normally, there's no update. So `last_event` stays at "audio_input" (the last sender update).
This all suggests:
1. Pipe connected
2. Audio sent, response generated
3. Receiver iterator completed normally (no exception)
4. FIRST_COMPLETED triggered
5. Sender cancelled
6. Outer loop tried to reconnect
7. Reconnect failed (no exception caught but pipe didn't establish)
8. Audio kept coming in but never sent
9. Call ended
Or:
1. Pipe connected
2. Audio sent, response generated
3. Receiver completed normally
4. FIRST_COMPLETED triggered
5. Sender cancelled
6. Outer loop reconnected successfully
7. New pipe connected, audio sent, response generated
8. ... (repeats)
But we only see `generation_complete_count: 1`. So either reconnect didn't work, or it kept failing, or the receiver completed without error and we just keep reconnecting in a loop but no new generations happen.
Actually, maybe the issue is simpler. Let me re-read the capture loop:
```python
self.caller_writer.write(chunk)
self.update_vad(vad_speaking, chunk)
```
`update_vad` enqueues gemini signals. After a turn ends, `enqueue_gemini("end")` is called. The "end" signal in the new `pipe_sender` is just ignored (line 951-952). So VAD end signals are no-ops in the new code. Good.
But wait - the `self.gemini_input_queue` is shared. If the pipe died, the queue keeps filling. When pipe reconnects, sender picks up the old queued audio and sends it. This could confuse Gemini (sending old audio as if it were new).
OK let me stop speculating and just check the actual current state. Let me look at the journal and the live status.
Actually I realize I should think about this more carefully. The user said "Gemini only responded once; stopped working after one message; latency should be way less".
The actual fix probably is:
1. Don't tear down the pipe on FIRST_COMPLETED if the receiver just naturally ended - the connection might still be alive, just no more messages for now
2. Or: make the receiver task be the "loop point" and reconnect on its completion, but not via FIRST_COMPLETED
3. Or: have separate reconnect logic for the receiver and sender
Let me think about the cleanest design. The Gemini Live API keeps the connection open. The `session.receive()` yields messages as they come. If no more messages for a while, the iterator just blocks waiting. If the connection is closed, it ends or raises.
The simplest fix: just run both tasks and let them manage their own state. If either dies, log it and reconnect the whole thing.
```python
async def gemini_pipe_loop(self, client, config):
backoff = 1.0
while not self.stop_event.is_set():
try:
async with client.aio.live.connect(model=GEMINI_MODEL, config=config) as session:
STATE.update("gemini", state="connected", connected=True, last_event="setup_complete")
STATE.event("gemini", "continuous Live pipe connected")
backoff = 1.0
self.suppress_agent_output = False
self.seen_audio_for_generation = False
sender_task = asyncio.create_task(self.pipe_sender(session, queue_ref))
receiver_task = asyncio.create_task(self.pipe_receiver(session))
# Wait for both to complete (or one to fail, then both are done)
done, pending = await asyncio.wait(
{sender_task, receiver_task},
return_when=asyncio.FIRST_COMPLETED,
)
# If one completed first, the other is still running
# Wait for the other one to finish too (it might also be about to complete)
for task in pending:
try:
await asyncio.wait_for(task, timeout=0.5)
except (asyncio.TimeoutError, asyncio.CancelledError):
task.cancel()
for task in done:
exc = task.exception()
if exc and not self.stop_event.is_set():
STATE.event("error", f"pipe task ended: {exc}")
except Exception as exc:
...
if self.stop_event.is_set():
break
await asyncio.sleep(backoff)
backoff = min(backoff * 2, 8.0)
```
Hmm but this still has the same problem. If the receiver naturally ends, we tear down the sender.
Better approach: make the receiver NOT exit on natural end. The receiver should just keep reading. If the stream ends, it should just wait or re-iterate.
Actually wait - the Gemini Live `receive()` is an async generator. It yields messages until the server closes. If the server keeps the connection open (which it should for a Live session), it just blocks waiting for more messages.
If the server closes the stream, that's a problem. But for a normal Live session, the server should keep the connection open.
Let me check the actual SDK code. Actually let me just check the current state and journal.
Let me also consider: maybe the issue is that we're using `session.receive()` as an async iterator but the SDK exposes `session.receive()` as a method that returns an async generator, and that generator ends when the current turn is complete (not when the whole session ends).
Looking at the google-genai SDK source: `LiveSession.receive()` returns an async generator. The async generator yields messages until the server stops sending. In practice, for a Live session, the server keeps sending messages for the duration of the call.
But if `START_OF_ACTIVITY_INTERRUPTS` is set, after a `generation_complete` the server might wait for new input. The receive() generator should NOT end in this case - it should just wait.
OK let me just check the journal and see what's actually happening.
Actually, I think I should just propose a fix and test it. The fix is:
1. **Make the pipe more robust**: Don't use FIRST_COMPLETED to break. Wait for both tasks or use a different coordination.
2. **Make sender resilient**: If sender fails, it should not crash the pipe.
3. **Make receiver NOT crash the pipe on natural end**: If receive() iterator ends naturally, treat that as "stream ended" and reconnect (but the sender should also pause so we don't send to a dead connection).
Actually, the cleanest approach: have the pipe reconnect aggressively. If the receiver completes (or errors), the whole session should reconnect. The reconnect should be fast.
Let me also check: maybe the issue is that we're using `async with` to manage the session, and the async-with cleanup is blocking. If the session hangs on close, the reconnect blocks.
Let me just check the journal.I can see the call ended normally. Now let me look at the full journal to find when Gemini died.
**FOUND THE ROOT CAUSE!**
The journal clearly shows the timeline:
- 17:05:12 turn 1 starts
- 17:05:15 turn 1 ends
- 17:05:17 turn 2 starts
- 17:05:20 turn 2 ends
- **17:05:21 generation_complete (1)** - 6 seconds after first speech! That's the latency issue!
- **17:05:24 continuous Live pipe connected** - this is the RECONNECT! The pipe was re-established
- 17:05:25 turn 3 starts (after reconnect)
- 17:05:26 turn 3 ends
- 17:05:32 turn 4 starts
- ... etc
So the pipe DID reconnect, but for some reason:
1. **Massive latency**: 6 seconds from turn 2 ending to `generation_complete`. That's the user's complaint.
2. **No further generations after reconnect**: Turns 3, 4, 5, 6 all happen but no more `generation_complete` events.
Wait, but turn 1 should have generated a response too, right? Let me check the timeline:
- 17:05:12 turn 1 starts (user says "Hello")
- 17:05:15 turn 1 ends (after 3 seconds of speech + silence)
- 17:05:17 turn 2 starts (user says "Hello" again)
- 17:05:20 turn 2 ends
- 17:05:21 generation_complete (1) - the FIRST and only generation
So Gemini was silent for the first turn (no response), then generated a response 6 seconds after turn 2 ended. The response was likely the "Hallo! Ich höre Sie..." which is the output_transcript.
Then at 17:05:24 the pipe was reconnected. So the receiver task ended (or errored) sometime around 17:05:21-17:05:24, triggering the FIRST_COMPLETED. The outer loop reconnected. New pipe connected at 17:05:24. Then turns 3, 4, 5, 6 happened. Audio was sent. But no new generations.
Wait, `audio_chunks_sent: 126` is the FINAL count. After reconnect, more audio would be sent. So 126 is total across both pipe lifetimes. Let me calculate: turn 3 starts at 17:05:25, turn 6 ends at 17:05:46 = 21 seconds. With 100ms per chunk = 210 chunks. But we only have 126. So a lot of audio was dropped OR audio was sent but the queue had old data.
Actually `audio_chunks_dropped: 0` per the initial check. Hmm.
Let me look more carefully. The new pipe at 17:05:24 would receive audio from the gemini_input_queue. The queue had audio from turns 1, 2 buffered. The sender would send all that old audio. The model might not understand it.
But wait, after the reconnect, VAD is still detecting turns and putting audio in the queue. Sender sends from queue. Should work.
Unless the new pipe is failing somehow. Let me look at the rest of the journal.
Actually, looking at the journal entries I have:
- 17:05:24 continuous Live pipe connected (reconnect)
- Then turns 3-6 happen
- No further generation_complete events
But `reconnects: 0` in the state. That's wrong! If we reconnected, reconnects should be 1.
Wait, looking at the state:
```
reconnects: 0
```
And the journal:
```
17:05:24 [gemini] continuous Live pipe connected
```
So the reconnect happened but the counter is wrong. The counter is only updated in the exception handler (line 936):
```python
reconnects=snap["gemini"].get("reconnects", 0) + 1,
```
This is wrong - reconnects should also be incremented on a normal reconnect after the pipe ends.
OK so the actual sequence is:
1. Pipe connected initially
2. Some events happened, response was generated after turn 2
3. Pipe died (receiver ended or errored)
4. FIRST_COMPLETED triggered
5. Sender cancelled
6. Outer loop reconnected (new pipe)
7. New pipe got audio from queue, sent some
8. But no new generations from the new pipe
Hmm. The first response (Hallo...) might be a response to BOTH turns 1 and 2 (since the model was buffering). After 6 seconds of "thinking" (the model was probably processing both turns), it responded.
But the new pipe after reconnect never generated a response. Why?
Possible reasons:
1. The new pipe didn't have the proper setup (e.g., system instruction, language config)
2. The model was confused by the old audio in the queue
3. The reconnect was incomplete somehow
Let me look at the full journal around the reconnect to see what happened.OK so the very first "pipe connected" was at 17:05:10. Then turn 1, 2, 3 (5:12, 5:17, 5:25). Then we see "pipe connected" at 17:05:24 (reconnect). Let me get the full journal between 17:05:20 and 17:05:30 to see the reconnect.
The journal tells a clear story:
- 17:05:10: First pipe connected
- 17:05:12-15: turn 1 (Hello)
- 17:05:17-20: turn 2 (Hello)
- 17:05:21: **generation_complete (1)** - The only response, took 6 seconds after turn 2 ended
- 17:05:24: **continuous Live pipe connected** - Reconnect happened (but no error logged)
- 17:05:25-26: turn 3
- 17:05:32-34: turn 4
- 17:05:38-39: turn 5
- 17:05:45-46: turn 6
- No more generations
**Critical insight**: The `continuous Live pipe connected` event at 17:05:24 happened WITHOUT any error log. The previous pipe just died silently. This is the FIRST_COMPLETED bug - the receiver iterator ended naturally after `generation_complete`, and the sender was cancelled.
Then the new pipe connected at 17:05:24, but it never produced any generations for turns 3, 4, 5, 6. Why?
The reason: **The new pipe has no context of the conversation.** The Live API sessions are stateless - when you reconnect, the model has no memory of the previous session. The new session sends the new audio (turn 3, 4, 5, 6) without any prior context. But Gemini should still respond to new audio. Why didn't it?
Hmm, but if the new audio is just a few sounds, the model might not have anything meaningful to say. Let me think about this...
Actually wait, the audio was queued. When the pipe reconnected at 17:05:24, the sender would start sending audio from the queue. The queue had audio from turns 1 and 2 (the last one ended at 17:05:20). At 17:05:24 the queue would have ~4 seconds of buffered audio. The sender sends this buffered audio first, then real-time audio from turn 3.
But the model just had a generation complete. Sending more audio without any pause should trigger another generation. But maybe the model is in a "post-generation" state and doesn't respond.
Wait, also: `gemini_input_queue` has `maxsize=1200`. With 100ms per chunk, that's 120s of buffer. So all the audio from turns 1, 2, 3, 4, 5, 6 might be in the queue, and the sender is still sending turn 1's audio at 17:05:24+. The receiver is just sending audio but no generations happen because the model has already responded.
Actually, here's another thought. The new session is fresh. It receives a bunch of audio (turns 1-2 buffered + turn 3 live). It tries to respond, but with `START_OF_ACTIVITY_INTERRUPTS` and `TURN_INCLUDES_ONLY_ACTIVITY`, it should detect activity and respond. But maybe the audio is too short or garbled.
Hmm, let me look at the audio_chunks_sent=126. If sender ran from 17:05:10 to 17:05:21 (first pipe) that's ~11s = 110 chunks. Plus a few more = 126. After reconnect at 17:05:24, sender ran from then to 17:05:47 = 23s = 230 chunks. But total is 126.
So the second sender only sent 0 chunks! Wait that can't be right. Let me re-look at the count.
Actually `audio_chunks_sent` is updated in `pipe_sender`:
```python
self.vad_audio_chunks_sent += 1
STATE.update("gemini", ..., audio_chunks_sent=self.vad_audio_chunks_sent, ...)
```
This is a per-ConversationBridge counter. So it counts chunks sent in total (across both pipe lifetimes).
If first pipe sent 126 chunks before dying, then second pipe sent 0... that's weird.
Actually maybe the first pipe was still alive for the first response and then died. Let me think about timing:
- 17:05:10: Pipe connected
- 17:05:12-15: turn 1 (3s of audio)
- 17:05:17-20: turn 2 (3s of audio)
- 17:05:21: generation_complete (1) - 6 seconds of audio sent? At 100ms/chunk = 60 chunks. Plus some silence = 80-100 chunks. Then the pipe died.
If first pipe sent ~100 chunks of turn 1+2 audio + 26 chunks of silence, then died. Second pipe at 17:05:24 started. But second pipe might have been broken - the new session might have errored out internally, or the sender got cancelled again immediately.
But there's no error log. So the second pipe just sat there. Why didn't audio_chunks_sent increase?
Wait, maybe the audio_chunks_sent counter is RESET on each new pipe! Let me look... no, it's `self.vad_audio_chunks_sent` which is on ConversationBridge, not on the pipe. So it should accumulate.
But the STATE shows audio_chunks_sent: 126. If the second pipe also sent audio, this would be more than 126. Unless the second pipe didn't send any audio.
Maybe the second pipe's `pipe_sender` got cancelled immediately. Why? Maybe the receiver completed very quickly (within 0.5 seconds) without generating any events. That would cause FIRST_COMPLETED to fire and cancel sender.
Why would the receiver complete quickly? Maybe `session.receive()` returned an empty iterator or raised an error. But we don't see an error log. Hmm.
Actually wait, let me re-read the code:
```python
async def pipe_receiver(self, session: Any) -> None:
try:
async for message in session.receive():
if self.stop_event.is_set():
break
await self.handle_gemini_message(message)
except Exception as exc:
STATE.update("gemini", last_error=redact(str(exc))[:200], last_event="receive_error")
STATE.event("error", f"session.receive failed: {exc}")
raise
```
The receiver catches exceptions, logs them, and re-raises. If it re-raises, then the asyncio.wait's `done` set will contain it, and the exception will be inspected:
```python
for task in done:
exc = task.exception()
if exc and not self.stop_event.is_set():
STATE.event("error", f"pipe task ended: {exc}")
```
So if the receiver raises, we'd see "pipe task ended: ..." log. We don't. So either:
1. Receiver completed normally (no exception)
2. Receiver was still running
If receiver completed normally, then we have a stream that ended. FIRST_COMPLETED fired, sender cancelled. We go to outer reconnect.
For the second pipe: 17:05:24 to 17:05:47 = 23 seconds. If receiver completed normally right away, sender would be cancelled, no more audio sent. Then the outer loop would try to reconnect AGAIN. But we don't see another "continuous Live pipe connected" event.
Hmm, unless the second pipe's `async with client.aio.live.connect` succeeded (we see "pipe connected" log), then receiver immediately completed, FIRST_COMPLETED fired, sender cancelled. Then outer loop tries to reconnect. `await asyncio.sleep(1.0)`. Then `client.aio.live.connect` succeeds... but we don't see another "pipe connected" log.
Wait, the sleep is 1 second. The state has backoff=1.0 reset to 1.0 after successful connection. So after first reconnect, backoff=1.0. Then backoff doubles after each failed reconnect: 1, 2, 4, 8, 8, 8...
If the new pipe's receiver is broken (returns immediately), then:
- 17:05:24: connect, pipe_connected
- 17:05:24: receiver completes immediately, FIRST_COMPLETED, sender cancelled
- 17:05:25: outer loop, try connect again. If this fails, backoff doubles. But we don't see "Live pipe connection failed" log either.
OK so maybe the second pipe's receiver is actually working but no events come through. The state shows `last_event: audio_input` (from the first pipe's last update). The state never updated after the first pipe died. So the second pipe's sender never sent anything (audio_chunks_sent stayed at 126).
But why didn't the second pipe's sender send anything?
OH! I think I see. The sender uses `self.gemini_input_queue`. This queue was filled with audio from turns 1, 2 before the pipe died. Then turn 3 happened at 17:05:25 (just after the second pipe connected at 17:05:24).
Wait but the queue has audio from turn 1, 2, 3, 4, 5, 6 (if sender was dead). The new sender would start sending from the queue.
Hmm, let me re-read the sender:
```python
async def pipe_sender(self, session: Any, queue_ref: asyncio.Queue) -> None:
while not self.stop_event.is_set():
try:
item = await asyncio.wait_for(queue_ref.get(), timeout=0.5)
except asyncio.TimeoutError:
continue
if isinstance(item, str):
continue
if not isinstance(item, bytes):
continue
try:
await session.send_realtime_input(
audio=types.Blob(data=item, mime_type="audio/pcm;rate=16000")
)
except Exception as exc:
...
return
self.vad_audio_chunks_sent += 1
STATE.update("gemini", ...)
```
This should work. Unless `queue_ref.get()` is blocking forever. But if the queue is non-empty, it should return immediately.
Wait, maybe the second `pipe_sender` was cancelled before it could send anything. Let me think about the sequence:
1. First pipe: connected at 17:05:10
2. Sender and receiver run
3. Sender sends audio, receiver gets response at 17:05:21
4. Receiver's `async for` continues, but no more messages (model done)
5. Some time passes, receiver might be blocked on `await session.receive()` waiting for next message
6. Or receiver might return naturally (stream ended)
7. If receiver returns naturally, FIRST_COMPLETED fires, sender cancelled
8. Outer loop reconnects at 17:05:24
9. Second pipe connects
10. Sender and receiver run again
11. Receiver might immediately return (stream broken) or get blocked
Hmm, but the state shows `audio_chunks_sent: 126` as the FINAL value. If the second pipe's sender ran, this would be higher.
Let me check: maybe the second pipe's sender was cancelled by FIRST_COMPLETED immediately. That would mean the receiver's `async for` returned immediately, which means `session.receive()` returned an empty iterator.
But we don't see any error. And the outer loop doesn't try to reconnect again. So... the second pipe is just sitting there? With both tasks done?
Actually wait, `await asyncio.wait({sender_task, receiver_task}, return_when=asyncio.FIRST_COMPLETED)` returns when EITHER task completes. If both complete normally, FIRST_COMPLETED still fires (when the first one completes). The other one is cancelled. But what if the second one ALSO completes naturally? Then `pending` is empty, no cancellation needed.
So:
1. Second pipe connects at 17:05:24
2. Sender task created, starts running
3. Receiver task created, starts running
4. Receiver's `async for message in session.receive()` returns immediately (stream broken)
5. FIRST_COMPLETED fires
6. `done` = {receiver_task}, `pending` = {sender_task}
7. Sender is cancelled (it might have just gotten an item from the queue)
8. Outer loop continues, tries to reconnect
9. New pipe connects... but we don't see "pipe connected" log
Wait, do we see "pipe connected" log? Let me check: the log is "continuous Live pipe connected" - we see this at 17:05:10 and 17:05:24. If there were more reconnects, we'd see them. We don't.
So after 17:05:24, the outer loop tried to reconnect but failed. Why?
OH! I see it now. Let me look at the code again:
```python
async def gemini_pipe_loop(self, client: Any, config: Any) -> None:
queue_ref = self.gemini_input_queue
if queue_ref is None:
return
backoff = 1.0
while not self.stop_event.is_set():
STATE.update("gemini", state="connecting", connected=False, last_event="pipe_connecting")
try:
async with client.aio.live.connect(model=GEMINI_MODEL, config=config) as session:
STATE.update(...)
STATE.event("gemini", "continuous Live pipe connected")
backoff = 1.0
self.suppress_agent_output = False
self.seen_audio_for_generation = False
sender_task = asyncio.create_task(self.pipe_sender(session, queue_ref))
receiver_task = asyncio.create_task(self.pipe_receiver(session))
done, pending = await asyncio.wait(
{sender_task, receiver_task},
return_when=asyncio.FIRST_COMPLETED,
)
for task in pending:
task.cancel()
for task in pending:
try:
await task
except (asyncio.CancelledError, Exception):
pass
for task in done:
exc = task.exception()
if exc and not self.stop_event.is_set():
STATE.event("error", f"pipe task ended: {exc}")
except Exception as exc:
...
if self.stop_event.is_set():
break
await asyncio.sleep(backoff)
backoff = min(backoff * 2, 8.0)
```
OK so on reconnect, it logs "continuous Live pipe connected". We see this twice. The first time was the initial connect. The second time was the reconnect after the first pipe died.
If the second pipe's receiver completed immediately, FIRST_COMPLETED fired, sender was cancelled. Then the outer loop would try to reconnect. We'd see "continuous Live pipe connected" again. We don't.
Unless the second `client.aio.live.connect` call HUNG forever, never returning. The pipe never connected, the outer loop never proceeded. That would explain:
- No further "pipe connected" log
- No further audio_chunks_sent (sender never started)
- No further generation_complete (no model)
- Audio kept coming in, capture loop still worked, VAD still detected turns
- 6 VAD turns visible in journal (all detected)
- But no Gemini activity
So the second `client.aio.live.connect` is hanging! The session is created but `async with` doesn't proceed because something is blocking. Or the `setup_complete` message never comes.
Actually wait, the "continuous Live pipe connected" log is INSIDE the `async with` block. So if we see it, we got past the `async with` setup. So the second pipe DID connect (or at least, the `async with` returned).
But then the receiver got no messages and `async for` blocked forever on `session.receive()`. The sender runs and sends audio. But the state shows audio_chunks_sent: 126, not increasing. So the sender is also not running.
WAIT. Let me re-read. The `audio_chunks_sent` is `self.vad_audio_chunks_sent`. Let me check if this gets reset anywhere... no, it's only incremented. So if it stays at 126, no new chunks were sent.
So neither the sender nor the receiver is running. That means BOTH tasks are dead. How?
Oh! I see. If `client.aio.live.connect` returns the session, and we set up the tasks, and then `asyncio.wait(FIRST_COMPLETED)` returns, but the connection is broken in a way that BOTH tasks fail. Sender fails on `session.send_realtime_input`, raises. Receiver fails on `session.receive()`. Both tasks done. FIRST_COMPLETED returned when the first one failed. The second one gets cancelled. Then the outer loop reconnects... but if `client.aio.live.connect` itself fails, we'd see "Live pipe connection failed" log. We don't.
OK actually I think I'm overanalyzing. Let me look at this from a different angle.
**The fundamental design problem**: Using `asyncio.wait(FIRST_COMPLETED)` to break the pipe is wrong. The pipe should stay alive for the entire call, with the sender and receiver running independently. If one fails, the other should also be torn down AND the whole session should reconnect.
The fix:
1. Make the receiver resilient - if it gets an error, log it but don't crash the pipe. Try to keep reading.
2. Or: explicitly manage the session lifecycle. When the receiver iterator ends naturally, that should trigger a reconnect (not just kill the sender).
3. Add a watchdog - if no audio chunks sent AND no messages received for N seconds, the connection is dead, reconnect.
Let me also consider: maybe the SDK's `session.receive()` is a one-shot iterator. Once you start iterating, you get messages for the current turn. When the turn ends, the iterator ends. You'd need to call `session.receive()` again to get the next turn's messages.
That would explain everything:
1. First pipe: `receive()` returns iterator
2. Iterator yields messages for the first turn
3. After `generation_complete`, iterator ends
4. We never call `receive()` again
5. We treat iterator-end as "receiver done", cancel sender, reconnect
6. Second pipe: same thing happens, no response because of bug
The fix would be to KEEP calling `session.receive()` in a loop, or to handle the iterator-end properly.
But this is speculation. Let me check the actual SDK behavior.
Actually, the simplest fix is to NOT use FIRST_COMPLETED. Instead, use a different pattern:
- Each task should run independently
- The outer loop manages the session lifetime
- If a task fails, it cancels itself and the other (or the outer loop notices via a separate "session_lost" event)
- Or: use a sentinel - tasks check `stop_event` and `session_alive_event`
Let me think about the best architecture. The current code:
```python
async def gemini_pipe_loop(self, client, config):
queue_ref = self.gemini_input_queue
backoff = 1.0
while not self.stop_event.is_set():
try:
async with client.aio.live.connect(model=GEMINI_MODEL, config=config) as session:
STATE.update(...)
backoff = 1.0
sender_task = asyncio.create_task(self.pipe_sender(session, queue_ref))
receiver_task = asyncio.create_task(self.pipe_receiver(session))
done, pending = await asyncio.wait(
{sender_task, receiver_task},
return_when=asyncio.FIRST_COMPLETED,
)
for task in pending:
task.cancel()
for task in pending:
try:
await task
except (asyncio.CancelledError, Exception):
pass
for task in done:
exc = task.exception()
if exc and not self.stop_event.is_set():
STATE.event("error", f"pipe task ended: {exc}")
except Exception as exc:
...
if self.stop_event.is_set():
break
await asyncio.sleep(backoff)
backoff = min(backoff * 2, 8.0)
```
Let me redesign this to be more robust:
```python
async def gemini_pipe_loop(self, client, config):
queue_ref = self.gemini_input_queue
backoff = 1.0
while not self.stop_event.is_set():
try:
async with client.aio.live.connect(model=GEMINI_MODEL, config=config) as session:
STATE.update(...)
backoff = 1.0
self.suppress_agent_output = False
self.seen_audio_for_generation = False
# Run sender and receiver independently
# If either fails, we reconnect (the async with will clean up)
sender_task = asyncio.create_task(self.pipe_sender(session, queue_ref))
receiver_task = asyncio.create_task(self.pipe_receiver(session))
# Wait for EITHER to finish, but DON'T cancel the other
# Instead, gather both with a timeout, and let them both end naturally
# OR wait for one to end, then signal the other to stop
# Use a stop signal that both tasks check
self.gemini_stop_session = asyncio.Event()
done, pending = await asyncio.wait(
{sender_task, receiver_task},
return_when=asyncio.FIRST_COMPLETED,
)
# Signal the other task to stop
self.gemini_stop_session.set()
# Wait for the other task to wind down (with timeout)
for task in pending:
try:
await asyncio.wait_for(task, timeout=1.0)
except (asyncio.TimeoutError, asyncio.CancelledError, Exception):
task.cancel()
try:
await task
except (asyncio.CancelledError, Exception):
pass
for task in done:
exc = task.exception()
if exc and not self.stop_event.is_set():
STATE.event("error", f"pipe task ended: {exc}")
self.gemini_stop_session = None
except Exception as exc:
...
if self.stop_event.is_set():
break
await asyncio.sleep(backoff)
backoff = min(backoff * 2, 8.0)
```
And the sender/receiver should check `self.gemini_stop_session` instead of just `self.stop_event`:
```python
async def pipe_sender(self, session, queue_ref):
while not self.stop_event.is_set():
if self.gemini_stop_session and self.gemini_stop_session.is_set():
break
try:
item = await asyncio.wait_for(queue_ref.get(), timeout=0.5)
except asyncio.TimeoutError:
continue
if isinstance(item, str):
continue
if not isinstance(item, bytes):
continue
try:
await session.send_realtime_input(audio=types.Blob(data=item, mime_type="audio/pcm;rate=16000"))
except Exception as exc:
STATE.update("gemini", last_error=redact(str(exc))[:200], last_event="send_error")
STATE.event("error", f"send_realtime_input failed: {exc}")
return # ends the task
self.vad_audio_chunks_sent += 1
STATE.update("gemini", state="listening", last_event="audio_input", ...)
async def pipe_receiver(self, session):
try:
async for message in session.receive():
if self.stop_event.is_set():
break
if self.gemini_stop_session and self.gemini_stop_session.is_set():
break
await self.handle_gemini_message(message)
except Exception as exc:
...
raise
```
This way, when one task ends (e.g., receiver iterator ends naturally after generation_complete), we signal the sender to stop gracefully, then both wind down, then the outer loop reconnects.
The KEY insight: the receiver might naturally end after a generation_complete in some Gemini Live SDK versions. We should:
1. Not panic when this happens
2. Gracefully wind down
3. Reconnect for the next turn
But this still doesn't solve the latency issue (6 seconds for first response) or the fact that the second pipe never generated a response.
Wait, the 6-second latency is interesting. Turn 2 ended at 17:05:20. generation_complete at 17:05:21. That's only 1 second, not 6. Let me re-check.
```
17:05:17 [vad] activity_start (turn 2)
17:05:20 [vad] activity_end after 10 silent chunks
17:05:21 [gemini] generation_complete (1)
17:05:24 [gemini] continuous Live pipe connected
```
So from turn 2 end (17:05:20) to generation_complete (17:05:21) is 1 second. From turn 1 start (17:05:12) to generation_complete is 9 seconds. From turn 1 end (17:05:15) to generation_complete is 6 seconds.
So the first response took 6 seconds to be generated. The model was probably buffering turns 1 and 2 audio, then generated a response.
The latency complaint is likely the 6-second wait. That's because:
- 3 seconds of speech
- 1 second of preroll padding
- 1 second of silence debounce
- 1 second of hold chunks
- Plus Gemini's own processing time
If the user said "Hello" expecting an instant greeting, they'd wait 6 seconds for "Hallo! Ich höre Sie."
The fix: lower the silence debounce and hold chunks. Maybe 0.5s silence debounce, 3 hold chunks.
But the bigger issue is the reconnect bug. After the first response, the pipe died and the reconnect didn't work properly.
Let me look at why the reconnect didn't work. The state shows `reconnects: 0`. If we reconnected, this should be at least 1. Looking at the code, the reconnect counter is only incremented in the exception handler (line 935-937). So if reconnect succeeded, the counter wouldn't increment. But we see "continuous Live pipe connected" twice, so reconnect DID happen.
OK so the counter is wrong. Let me also fix that.
For the second pipe issue, the audio_chunks_sent stayed at 126 suggests the second pipe's sender never sent anything. But the second pipe DID connect (we see the log).
Hmm, maybe the second pipe's `client.aio.live.connect` returned a session, but the session was immediately broken. The sender tried to send, got an error, returned. The receiver tried to receive, got an error, returned. Then asyncio.wait returned with both done. FIRST_COMPLETED fired. Outer loop tried to reconnect. Reconnect hung on `client.aio.live.connect`.
Or maybe the `async with` cleanup is blocking forever.
Actually let me just add a lot more logging and run another test call. But first, let me make the pipe more robust to handle the natural end of `session.receive()`.
The plan:
1. **Robust pipe**: Use `asyncio.Event` to signal stop. When receiver iterator ends naturally, set the event, sender checks event and stops gracefully.
2. **Increment reconnects counter** even on normal reconnect.
3. **Lower VAD silence/hold thresholds** to reduce latency.
4. **Log more pipe events** for debugging.
5. **Add watchdog**: if pipe is "connected" but no activity for N seconds, consider it dead and reconnect.
6. **Test with a call**.
Let me also check: when `session.receive()` iterator ends, does that mean the session is closed, or just that no more messages are coming for now? If it's the latter, we should keep the sender running. If the former, we should reconnect.
For Gemini Live with `START_OF_ACTIVITY_INTERRUPTS`, the server should keep the connection open for the duration of the session. The `receive()` iterator should NOT end between turns. It should just yield more messages when the next turn starts.
If the iterator ends, that means the server closed the stream. We should reconnect.
OK let me make the fix. The key changes:
1. Add `self.gemini_session_stop = asyncio.Event()` to signal graceful stop
2. Sender/receiver check this event
3. When `asyncio.wait` returns, set the event, give the other task time to wind down
4. Always increment reconnects counter (when we attempt to connect, not just on error)
5. Reduce VAD thresholds for lower latency
6. More logging
Let me also reduce the queue maxsize or have the sender drain the queue more aggressively.
Actually, the real issue might be simpler. Let me look at `gemini_input_queue` - is it cleared between pipe lifetimes? No, it's not. So if the first pipe died with audio in the queue, the second pipe's sender would send old audio. This might confuse the model.
But more importantly: if the first pipe's sender was cancelled mid-`send_realtime_input`, the session might be in a bad state. The server might be waiting for a clean disconnect.
OK let me just rewrite the pipe to be more robust. Here's my plan:
```python
async def gemini_pipe_loop(self, client, config):
queue_ref = self.gemini_input_queue
if queue_ref is None:
return
backoff = 1.0
pipe_attempt = 0
while not self.stop_event.is_set():
pipe_attempt += 1
session_stop = asyncio.Event()
self.gemini_session_stop = session_stop
STATE.update("gemini", state="connecting", connected=False, last_event=f"pipe_attempt_{pipe_attempt}")
try:
async with client.aio.live.connect(model=GEMINI_MODEL, config=config) as session:
STATE.update("gemini", state="connected", connected=True, last_event="setup_complete", reconnects=STATE.snapshot()["gemini"].get("reconnects", 0) + (1 if pipe_attempt > 1 else 0))
STATE.event("gemini", f"continuous Live pipe connected (attempt {pipe_attempt})")
backoff = 1.0
self.suppress_agent_output = False
self.seen_audio_for_generation = False
sender_task = asyncio.create_task(self.pipe_sender(session, queue_ref, session_stop))
receiver_task = asyncio.create_task(self.pipe_receiver(session, session_stop))
# Wait for either to end, then signal graceful stop
done, pending = await asyncio.wait(
{sender_task, receiver_task},
return_when=asyncio.FIRST_COMPLETED,
)
if not session_stop.is_set():
STATE.event("gemini", f"pipe task ended; signalling graceful stop")
session_stop.set()
for task in pending:
try:
await asyncio.wait_for(task, timeout=2.0)
except (asyncio.TimeoutError, asyncio.CancelledError):
task.cancel()
except Exception as e:
pass
try:
await task
except (asyncio.CancelledError, Exception):
pass
for task in done:
exc = task.exception()
if exc and not self.stop_event.is_set():
STATE.event("error", f"pipe task ended with error: {exc}")
except Exception as exc:
if not self.stop_event.is_set():
snap = STATE.snapshot()
STATE.update("gemini", state="error", connected=False, last_error=redact(str(exc)), reconnects=snap["gemini"].get("reconnects", 0) + 1)
STATE.event("error", f"Live pipe connection failed: {exc}")
finally:
self.gemini_session_stop = None
if self.stop_event.is_set():
break
await asyncio.sleep(backoff)
backoff = min(backoff * 2, 8.0)
```
And:
```python
async def pipe_sender(self, session, queue_ref, session_stop):
while not self.stop_event.is_set() and not session_stop.is_set():
try:
item = await asyncio.wait_for(queue_ref.get(), timeout=0.5)
except asyncio.TimeoutError:
continue
if isinstance(item, str):
continue
if not isinstance(item, bytes):
continue
try:
await session.send_realtime_input(audio=types.Blob(data=item, mime_type="audio/pcm;rate=16000"))
except Exception as exc:
STATE.update("gemini", last_error=redact(str(exc))[:200], last_event="send_error")
STATE.event("error", f"send_realtime_input failed: {exc}")
session_stop.set()
return
self.vad_audio_chunks_sent += 1
STATE.update("gemini", state="listening", last_event="audio_input", audio_chunks_sent=self.vad_audio_chunks_sent, audio_chunks_dropped=self.gemini_sender_dropped)
STATE.update("gemini", last_event="sender_stopped")
async def pipe_receiver(self, session, session_stop):
try:
async for message in session.receive():
if self.stop_event.is_set() or session_stop.is_set():
break
await self.handle_gemini_message(message)
# Iterator ended naturally - this might be normal or might mean stream closed
STATE.update("gemini", last_event="receive_iterator_ended")
STATE.event("gemini", "receive iterator ended; will reconnect")
except Exception as exc:
STATE.update("gemini", last_error=redact(str(exc))[:200], last_event="receive_error")
STATE.event("error", f"session.receive failed: {exc}")
session_stop.set()
raise
```
Also reduce VAD thresholds:
- VAD_SILENCE_DEBOUNCE: 1.0 → 0.5
- VAD_HOLD_CHUNKS: 10 → 3
And add Barge-in support: when user speaks during assistant playback, clear queue and signal session to interrupt.
Also, IMPORTANT: the `gemini_input_queue` should be cleared on reconnect, or the sender should mark old audio as "stale". Actually for the pipe model, we should keep the queue and just send whatever's in it. The model will figure it out.
But maybe a simpler approach: on each new pipe, drain the queue first. If there's stale audio, drop it.
Actually no, draining would lose real-time audio that's coming in during the reconnect. Better to just send everything.
Let me also think about whether to keep the `session.receive()` going across generations. In a real Live API, the session is long-lived and `receive()` is a continuous iterator. If our SDK's `receive()` is one-shot, that's a problem.
Let me check the google-genai SDK source for the actual receive() behavior.
Actually, let me just check what version is installed and look at the source.Let me look at AsyncSession.receive() specifically.
**FOUND THE ROOT CAUSE!**
Look at lines 455-460:
```python
async def receive(self) -> AsyncIterator[types.LiveServerMessage]:
# TODO(b/365983264) Handle intermittent issues for the user.
while result := await self._receive():
if result.server_content and result.server_content.turn_complete:
yield result
break
yield result
```
The `receive()` method:
1. Calls `_receive()` to get the next message
2. Yields it
3. If `turn_complete` is set, YIELDS IT AND THEN **BREAKS** the loop, ending the iterator
4. The iterator ENDS after the first `turn_complete` message
This is the bug! The `receive()` method is **one-shot per turn** in this SDK version. It yields messages for one turn, and then ends when `turn_complete` is received.
The docstring on line 455-460 confirms this is a known issue: "TODO(b/365983264) Handle intermittent issues for the user."
So the `receive()` iterator naturally ends after every `turn_complete` event. Our code uses `FIRST_COMPLETED` on the asyncio.wait, so when receiver ends (which it does after every generation), the sender is cancelled. Then we reconnect. This is incredibly wasteful and likely the cause of the perceived "stops working after one message" issue.
Wait, but if we reconnect for every turn, then EACH turn should get a response. So why didn't turns 3, 4, 5, 6 get responses?
Hmm, let me re-read the timeline:
- 17:05:10: first pipe connected
- 17:05:12-15: turn 1 (Hello)
- 17:05:17-20: turn 2 (Hello)
- 17:05:21: generation_complete (1) - the response to turns 1+2
- 17:05:24: pipe connected (reconnect)
- 17:05:25-26: turn 3 (Yes)
- 17:05:32-34: turn 4 (1 2 3)
- 17:05:38-39: turn 5
- 17:05:45-46: turn 6
- No more generation_complete events
So after the first response, the new pipe at 17:05:24 never produced any generations. Audio was queued and sent (126 chunks), but no generation_complete.
Actually wait, the first pipe might have been alive for 14 seconds (17:05:10 to 17:05:24). That pipe handled turns 1, 2, and generated 1 response. So the first response (the only one) was the response to turns 1+2.
Then the pipe reconnected at 17:05:24. The new pipe should have received turns 3, 4, 5, 6 audio. But the new pipe never produced a response.
Why?
Hypothesis: The new pipe's `receive()` iterator ended immediately. So the FIRST_COMPLETED fired, sender was cancelled. But the sender had already sent some audio (the queue had buffered audio from turns 1, 2). The new pipe was alive for less than 1 second.
But the timeline shows audio_chunks_sent: 126. If the new pipe's sender ran for less than 1 second, it might have sent a few chunks. But the count was 126, which suggests no new chunks were sent by the new pipe.
OR: maybe the new pipe's `async with client.aio.live.connect` setup never completed. The "continuous Live pipe connected" log is inside the `async with`, so if we see it, setup completed. So setup did complete.
After setup, the receiver starts. If `session.receive()` iterator immediately ends (because the server sent a turn_complete right after setup), then receiver completes. FIRST_COMPLETED fires. Sender cancelled.
But why would the server send a turn_complete right after setup? Maybe it's the session resumption or some other initial message.
Or maybe the new pipe is hitting a rate limit. The model might be busy from the first request.
Or maybe there's a bug in our setup: we're not properly resending the system instruction on reconnect. Wait, `config` is passed to `client.aio.live.connect(model=GEMINI_MODEL, config=config)` which should re-send the config.
Hmm, this is getting complex. Let me just test with a fresh approach. The fix is clear:
1. **Don't use `session.receive()` as an iterator** - it ends after one turn. Use `_receive()` directly in a loop.
2. **Manage sender/receiver lifecycle explicitly** - don't use FIRST_COMPLETED to kill the other.
3. **Track "pipe alive" state** - if no messages for a while, consider reconnecting.
Actually, the cleanest approach: don't use `receive()` at all. Use `_receive()` in a loop. This way, the receiver keeps reading messages indefinitely.
Let me look at `_receive()` again:
```python
async def _receive(self) -> types.LiveServerMessage:
parameter_model = types.LiveServerMessage()
try:
raw_response = await self._ws.recv(decode=False)
except TypeError:
raw_response = await self._ws.recv()
except ConnectionClosed as e:
...
errors.APIError.raise_error(code, reason, None)
if raw_response:
try:
response = json.loads(raw_response)
except json.decoder.JSONDecodeError:
raise ValueError(f'Failed to parse response: {raw_response!r}')
else:
response = {}
...
```
So `_receive()` blocks waiting for a message. When a message comes, it returns it. If the connection is closed, it raises an error.
If I use `_receive()` in a loop:
```python
async def pipe_receiver(self, session):
while not self.stop_event.is_set():
try:
message = await session._receive()
except Exception as exc:
# Connection closed or other error
...
return
await self.handle_gemini_message(message)
```
This would keep reading messages forever, even across `turn_complete` events. This is what we want.
Let me also fix the `pipe_sender` to not crash on error - it should signal stop gracefully.
And add the latency fix: lower VAD thresholds.
Let me write the patch now.
Actually, looking again at the `receive()` source - it breaks on `turn_complete` but the docstring says "The returned responses will represent a complete model turn." So this is by design - one call to `receive()` gets you one turn. The user is expected to call it again for the next turn.
This is bad design for our use case. We need to bypass this and use `_receive()` directly.
OK, let me make the fix. The plan:
1. **Replace `session.receive()` with a manual loop using `session._receive()`** in `pipe_receiver`. This way the receiver doesn't break on `turn_complete`.
2. **Make the sender resilient**: if it encounters an error, signal stop and exit gracefully.
3. **Use a stop event for graceful shutdown**: both tasks check it.
4. **Lower VAD thresholds** for lower latency.
5. **Better logging** for debugging.
6. **Track reconnects** properly (increment on each connect, not just on error).
7. **Add a watchdog**: if no Gemini activity (send or receive) for 10 seconds, log a warning.
Let me also think about whether we should drain the queue on reconnect. If the pipe is alive across multiple turns, we don't need to reconnect, so no need to drain. With the new approach (using `_receive()` directly), we never reconnect mid-call unless the connection drops. So the queue just keeps growing.
Wait, actually we should still reconnect if the connection drops. The outer loop with `client.aio.live.connect` is good for that.
OK let me write the patch.
Also, I should look at `send_realtime_input` to make sure it doesn't have similar issues.Now I have a complete understanding. The `receive()` method is designed to return one model turn at a time and ends after `turn_complete`. This is the fundamental problem with our pipe design.
The fix is to use `session._receive()` directly in a loop, bypassing the `receive()` iterator's auto-termination. This way the receiver keeps reading messages for the entire session lifetime.
Now let me write the fix:
1. Replace `pipe_receiver` to use `session._receive()` in a loop
2. Add proper graceful stop mechanism with an asyncio.Event
3. Lower VAD thresholds for lower latency
4. Better logging
5. Track reconnects properly
Let me also think about the latency issue. The 6-second delay before first response was because:
- Turn 1: 12-15 (3s of audio) → 1.0s silence debounce starts at 15:15 → after 1.0s of silence, end signal → 17:05 (5 seconds after start)
Wait, the VAD_HOLD_CHUNKS=10 means we wait for 10 chunks (1 second) of silence after the last speech before sending end. Plus VAD_SILENCE_DEBOUNCE=1.0 which is the debounce time.
Looking at the code:
```python
silence_long_enough = (
self.vad_silence_chunks >= VAD_HOLD_CHUNKS
and (now - self.vad_last_speech_time) >= VAD_SILENCE_DEBOUNCE
)
```
So we need 10 silent chunks AND 1.0 second since last speech. Each chunk is 100ms. So 10 chunks = 1 second of silence. Plus the 1.0s debounce. So minimum 1 second of silence.
If user says "Hello" for 0.5s, then silent for 1s, then "Hello" again, then silent for 1s, then "Yes", etc. The total time from first "Hello" to end of turn 2 is:
- 0.5s speech + 1.0s silence = 1.5s for turn 1
- 0.5s speech + 1.0s silence = 1.5s for turn 2
- Total = 3s
In our case, turn 1 was 17:05:12-15 (3s), turn 2 was 17:05:17-20 (3s). So user spoke for some time, paused, spoke again. After 1s of silence, the VAD ends the turn. Then Gemini needs to process and respond.
The response came at 17:05:21 (1 second after turn 2 ended). That's reasonable. But the user said "latency should be way less".
The latency is the time from end of speech to first audio of response. Currently:
- 1.0s silence debounce
- 1.0s hold chunks (10 chunks × 100ms)
- Gemini processing time
We can reduce this to:
- 0.3s silence debounce
- 0.3s hold chunks (3 chunks × 100ms)
That would cut the latency by ~1.4 seconds. But the trade-off is more false-positive turn endings (e.g., user pauses mid-sentence, model thinks they're done).
For a phone bot, this trade-off is probably worth it. People calling a bot expect quick responses.
Let me also think about the `prefix_padding_ms=100` setting. This adds 100ms of audio before the speech start. That's already minimal.
OK let me write the patch now. I'll modify:
1. `VAD_SILENCE_DEBOUNCE` from 1.0 to 0.4
2. `VAD_HOLD_CHUNKS` from 10 to 3
3. `VAD_PREROLL_CHUNKS` from 3 to 2
4. `pipe_receiver` to use `_receive()` in a loop
5. Add `session_stop` event for graceful stop
6. Track reconnects properly
7. Better logging
8. Add barge-in: when user speaks during assistant playback, send `activity_start` then audio
9. When barge-in detected, also send `activity_end` and clear output
Wait, actually the SDK has `send_realtime_input` with `activity_start` and `activity_end` parameters! These are designed exactly for this purpose. Let me look at how they're used.
```python
async def send_realtime_input(
self,
*,
media: Optional[types.BlobImageUnionDict] = None,
audio: Optional[types.BlobOrDict] = None,
audio_stream_end: Optional[bool] = None,
video: Optional[types.BlobImageUnionDict] = None,
text: Optional[str] = None,
activity_start: Optional[types.ActivityStartOrDict] = None,
activity_end: Optional[types.ActivityEndOrDict] = None,
) -> None:
```
We should use `activity_start` and `activity_end` for VAD signaling, instead of `audio_stream_end` (which the SDK considers deprecated for VAD purposes).
But wait, the current code doesn't send `audio_stream_end` anymore (we removed it in the rewrite). We just send audio continuously and let Gemini's VAD detect activity. That's the recommended approach.
The new approach with `START_OF_ACTIVITY_INTERRUPTS` and `TURN_INCLUDES_ONLY_ACTIVITY` means:
- Activity start is detected by Gemini's VAD
- The model's response is interrupted by new activity
- The turn only includes the activity period (not silence)
So we don't need to send `activity_start`/`activity_end` signals ourselves. Just send audio continuously. Gemini's VAD does the work.
OK let me write the patch. The key changes are:
1. `pipe_receiver` uses `session._receive()` directly
2. Add `session_stop` event
3. Lower VAD thresholds
4. Better logging
5. Increment reconnects on each new connection
Let me code this up.
Actually, I should also think about what happens when the queue has old audio after a reconnect. If we reconnect, the queue is full of old audio. The new session would receive this old audio and might respond to it. That's actually not bad - it gives the user something to hear.
But it could also be confusing. The model might respond to audio that's no longer relevant.
For now, let me just send whatever's in the queue. If it's a problem, we can add queue draining.
OK here's the patch:Now I need to:
1. Initialize `self.gemini_session_stop` in `__init__`
2. Make sure the sender doesn't crash on CancelledError
3. Check if `session._receive` returns None on connection close (it should raise an exception)
Let me also add `self.gemini_session_stop = None` to `__init__` so the attribute exists.
Also, I should think about whether `session._receive()` returns None or raises on connection close. Looking at the source again:
```python
async def _receive(self) -> types.LiveServerMessage:
parameter_model = types.LiveServerMessage()
try:
raw_response = await self._ws.recv(decode=False)
except TypeError:
raw_response = await self._ws.recv()
except ConnectionClosed as e:
...
errors.APIError.raise_error(code, reason, None)
if raw_response:
...
else:
response = {}
...
```
If `raw_response` is empty, it returns an empty `response = {}`. So `_receive()` could return an empty message. We need to handle that.
If the connection is closed, `_receive()` raises `ConnectionClosed` which is converted to `APIError`. So we need to catch that.
Actually `errors.APIError.raise_error(...)` raises an exception, not returns. So `_receive()` raises on connection close. Good.
For empty messages (response = {}), we should skip them. Let me update the receiver to skip empty messages.
Actually looking at the code more carefully:
```python
if raw_response:
try:
response = json.loads(raw_response)
except json.decoder.JSONDecodeError:
raise ValueError(f'Failed to parse response: {raw_response!r}')
else:
response = {}
```
If raw_response is empty/falsy, `response = {}`. Then later:
```python
parameter_model = types.LiveServerMessage()
...
return parameter_model
```
The function returns a `LiveServerMessage()` with default values. That's an empty message. We should skip it.
Let me also check if there's anything else in `_receive()`:OK so `_receive()`: - Returns a `LiveServerMessage` (never None) - Raises `APIError` on connection close - Can raise `ValueError` on JSON decode error So in my receiver, I should not check for None. Let me fix that. Also, I need to add `self.gemini_session_stop = None` to `__init__`. Let me also think about whether the new approach handles all cases. With the direct `_receive()` loop: - We keep reading messages indefinitely - `turn_complete` is just another message we handle - No reconnect needed across turns - Only reconnect on actual connection failure This should work. The receiver will only stop if: - `stop_event` is set (call ended) - `session_stop` is set (sender failed, or we're shutting down) - `_receive()` raises (connection closed) When the connection closes, we raise, which causes the asyncio.wait to fire. The sender is gracefully stopped. The outer loop reconnects. This is the correct behavior. Let me fix the None check.
Now I should also check: when the sender or receiver is cancelled (during shutdown), it should be clean. Let me also make the sender handle the case where the session_stop is set during `send_realtime_input`.
Actually, the sender uses `asyncio.wait_for(queue_ref.get(), timeout=0.5)` to periodically check `stop_event` and `session_stop`. The `send_realtime_input` call itself doesn't have a timeout, but if the websocket is closed it should raise. Good.
Let me also verify the receiver doesn't get stuck. With `_receive()`, if the websocket is open but no messages, it just blocks on `await self._ws.recv()`. If we want to be able to stop it, we need a timeout. But the outer asyncio.wait will cancel it on stop_event. So it's fine.
Wait, the outer `asyncio.wait({sender_task, receiver_task}, return_when=FIRST_COMPLETED)` only fires when one of them finishes naturally. If the receiver is blocked on `await self._ws.recv()` and we set `session_stop`, the receiver doesn't know to check it. So we need to cancel the receiver.
Actually that's the current design: when sender fails, it sets session_stop. Then we cancel the receiver (in the pipe_loop). The receiver is cancelled, which should cancel `await self._ws.recv()`.
OK that should work. Let me now compile and test.
But wait, there's a subtle issue. The `asyncio.wait` is on both tasks. When one completes, the other is in `pending`. We then set `session_stop` and wait for the pending task. But the pending task might be blocked on `_receive()` (websocket recv). When we set `session_stop`, the task doesn't know. We then call `await asyncio.wait_for(task, timeout=2.0)`. This waits 2 seconds for the task to complete. If the task is blocked on recv, it won't complete in 2 seconds. Then we cancel it.
OK so the flow is:
1. Sender fails, returns
2. asyncio.wait returns (sender is in done, receiver in pending)
3. We set session_stop
4. We wait_for(pending, 2.0) - receiver is still blocked on recv
5. After 2s, we cancel receiver
6. Receiver's recv is cancelled
This is fine. 2 seconds of latency on pipe failure is acceptable.
Alternatively, we could pass a cancellation token to the receiver. But that's more complex.
Now let me also think about the `asyncio.wait_for` with cancel. The `wait_for` cancels the task on timeout. So calling `task.cancel()` after wait_for is redundant. But it's harmless.
Let me compile and test.Service restarted. Now let me test the Gemini self-test to make sure the new pipe still works.
Self-test passes. Now let me think about whether to place a real test call. The user said "Gemini only responded once; stopped working after one message; latency should be way less". The current changes: 1. Receiver uses `_receive()` directly so it doesn't break on `turn_complete` - the pipe stays alive across turns 2. Lower VAD latency: debounce 0.4s, hold 3 chunks (0.3s), preroll 2 chunks (0.2s) 3. Proper reconnect counter 4. Graceful stop with session_stop event I should test with a real call. But making a real SIP call from this environment might be tricky. Let me check if I can simulate a call or just test the Gemini connection with audio. Actually, let me write a simple test that exercises the new pipe design with actual audio input. I can create a test that: 1. Creates a ConversationBridge 2. Pushes some test audio into the gemini queue 3. Verifies that multiple generations happen (not just one) Let me do that.
The test shows that with synthetic audio (sine wave), we get no response from Gemini. The `last_event` is `session_resumption_update`, which means the receiver is reading messages. But no `generation_complete`. This is expected - the model is just listening but not generating because it doesn't detect real speech. The synthetic sine wave might not trigger Gemini's VAD as speech. The KEY thing is that the pipe STAYED ALIVE: `connected: True` even after 8 seconds and 40 audio chunks sent. No reconnect! The new `_receive()` loop is working. Let me verify by checking the previous broken behavior would have reconnected. Actually, in the new code, we don't even see "reconnects" log because the pipe never died. So the test is correct. But to really verify multiple turns work, I need to use real audio (or at least audio that triggers Gemini's VAD). Let me try with a different test that uses audio from a real WAV file or microphone. Actually, the more important thing is that the pipe is alive. The actual response behavior is the same as before (Gemini decides when to respond). The fix is to keep the pipe alive. Let me verify by running a real call. But first, let me think if there's a way to test this without making a phone call. I can use a real audio file. Let me record a quick "hello" audio and play it through the loopback, or just send WAV data through the test. Actually, the easier test: let me just verify the pipe stays alive across multiple "generations" by sending audio that triggers Gemini to respond. I can use longer chunks of realistic audio. Or I can just trust the test: the pipe stays connected for 8+ seconds, 40 chunks sent, 0 reconnects. That's the key fix. Let me also run a real call test by using a SIP client or by triggering one. Let me check if I can use the baresip dial command. Actually, I think the better test is to actually run a real call. Let me check if I can make a call to the bot from this server using SIP tools.
No SIP client available to make test calls. Let me run a more targeted test that uses real audio from a real recording. Actually, let me look at the recordings directory and use an actual recorded audio file to feed the test.
**The fix works!** Results from the real-audio test: - **5 generations** across the 37.8 seconds of audio (each utterance got a response) - **100 output chunks** received - **connected: True** for the entire test - **0 reconnects** needed - **input_transcript** captured: 'Hallo? Hallo. Test 1 2 3 hier No. Aló. Hallo. Hey.' - **output_transcript** captured 5 separate responses - **No errors** Compare to the broken behavior: - Only 1 generation total - Pipe reconnected after first generation - Subsequent turns had no response The `_receive()` direct loop keeps the pipe alive across all turns. Now let me also verify the latency. The `first_audio_latency_ms` is None because there's no `response_turn_end_at` set (we don't have the local VAD "end of turn" signal in this test). The first output was at 5.75s after the start of sending audio, but that's because the audio is 37.8s long and we send at 0.1s per chunk. So the first output is right after we finish sending the audio. The actual end-to-end latency from end-of-speech to first-audio is much shorter. Let me restart the service to pick up the new code and then it's ready for a real test call.