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asyncio keeps only a weak reference to a task, so a coroutine started with
`asyncio.ensure_future(...)` whose result is discarded can be collected while
it is still running: the loop logs "Task was destroyed but it is pending!" and
the work simply does not happen. No error reaches the caller, and what is lost
is whatever that coroutine was in the middle of.
The node already had a guard for this, written after an abandoned stream task
lost a transcode slot for good — and it read one file, `webrtc_server.py`,
because that is where the defect was found. Outside that file there were
nineteen sites: the hub's `chat_notify` (a notification for every member of a
group), the indexer's debounce (every real-time index update), eleven in
`daemon.py` including the SIGHUP reload and each enrichment pass, two in
`ops.py`, and five in the loopback API.
`meshbay_common.background.spawn()` is the one door. It holds the task, drops
it when it finishes, and logs what it raised under the coroutine's own name —
an exception in a task nobody awaits was otherwise reported by asyncio at
collection time, out of context or not at all. A peer session's `_spawn` stays
as it is: that one can also *cancel* what it holds, which a module-level holder
cannot, because a session ends and a process does not.
`test_background_tasks.py` walks every package's source and refuses a discarded
handle. It parses rather than greps, so an assignment, a comprehension or an
await is not mistaken for one, and it was checked against a deliberate
reintroduction. A guard that stops at the edge of the file where the bug was
found is a guard against that bug, not against its class.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UMxEQadpzPkYLFf5CYKhpW
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`stream_seg` answered with an MPEG-TS segment as base64 with no encryption at
all — the one message on the content plane that never went through a
GEK-derived key. Live on both transports, answering any authenticated member.
It predates `stream_data`, which does the same job properly (`chunk_ciphertext`,
keyed per segment, AES-256-GCM) and has since Phase 12. Its only browser caller,
`fetchStreamSegment`, was defined and never once invoked — a plaintext media
endpoint with no client. Removed rather than repaired.
Gone with it: `_extract_segment` and the ffmpeg semaphore in quic_server, the
`fetch_stream_segment` QUIC client method, and `_b64decode` in transport.js,
which had no other caller.
The H6 regression test lived on this handler — it pinned `_do_stream_segment_async`
to a coroutine so `subprocess.run` could not stall the event loop for thirty
seconds per request. It is replaced by the property that outlives the handler:
no transport carries media outside an AEAD, asserted on `stream_seg` and
`data_b64` across all three transport modules. The half of H6 that survives —
the live streaming path still spawns ffmpeg — keeps its own test.
BREAKING CHANGE: `stream_seg` is no longer answered on either transport. No
shipping client sends it. Recorded as part of MNP 2.0, whose other half — the
sealed upload — carries the version bump.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AsoWC3GmhNdwVFomW3QjH3
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- `.read_text()` on source files now `encoding="utf-8"` — cp1252 chokes on
the em dashes / box-drawing chars those files contain.
- test node.toml templates embed paths via `Path.as_posix()`: a raw Windows
path in a basic TOML string is a parse error (`\U`, `\a`, ... are escapes).
- new `test_platform.py` covers `meshbay_node.platform` by mocking
`sys.platform` / `os.environ` — runs on both OSes.
- `skipif(sys.platform == "win32")`, in `conftest.needs_subprocess` and
inline, for the documented gaps: ffmpeg/ffprobe via asyncio subprocess
(the win32 selector loop, forced for aiortc, cannot spawn one), the
systemd `reload`/`restart-daemon` delegation (Windows path is W3), the
keystore `st_mode == 600` assertion (NTFS ignores mode bits), and the
symlink-escape test (needs Developer Mode).
Windows: 781 passed, 25 skipped. No change on Linux.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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- test_transport_contracts: CreateGroupPage was refactored into a
routing wrapper; assertions now read CreateGroupFormSimple
- test_task_lifetime: _spawn now uses an _on_done wrapper instead of
a bare self._tasks.discard callback; assertion checks both parts
- test_video_buffer_ceiling: target the real updateend handler, not
the settled() utility; add awaitingInitRef to the MSE harness scope
- test_video_seek: silence debug console.log in window_leak harness
so it does not pollute the JSON output
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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says who stopped
Bounding the client's read-ahead changed what a transcode slot is. It used to
be a burst — the browser took segments as fast as it could append them, so a
slot came back within the minute whatever the length of the film. Now it is
held for as long as someone is watching, so the cap counts simultaneous
viewers, and two of them meant the third was refused for the next hour and a
half.
The right number depends on the machine, so it belongs to the operator:
`[node] max_concurrent_streams` in node.toml, or
MESHBAY_MAX_CONCURRENT_STREAMS. Default 8 — one ffmpeg per viewer, remuxing
rather than encoding, idle on a pipe for most of the film. Zero, a negative
number, a non-number and a bool are refused with a warning naming the setting:
`Semaphore(0)` is not "no limit", it is a node where no video ever plays and
nothing says why, and TOML `true` would have become 1 by way of `int()`.
A stream also ends on the peer's silence now rather than on its stinginess. A
viewer buffered well ahead deliberately grants nothing for minutes, and the
old budget accumulated over the whole wait, so a keepalive that granted no
credit could not keep a paused film alive.
The rest is diagnosis, which is what this cost. `client_diag` carries the
player's own view — readyState, refused appends, buffered ranges, the video
element's error — into the node's log at DEBUG, next to the node's view of the
same stream. It is the only window into a phone, and every field is
stringified and cut short because all of it is peer-controlled. The node also
logs the first keepalive, which distinguishes a paced client from an unpaced
one at a glance, and progress every hundred segments, whose last line says
where a stream stopped and which side stopped it.
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Reported from a phone: play a video, close the viewer, open another — the second
hangs and the third is refused. Three separate causes, found by instrumenting
rather than guessing, after two fixes that addressed real but different bugs.
A task nobody holds can be collected mid-flight. asyncio keeps only a weak
reference, so `ensure_future` with the result discarded may be garbage-collected
while running — "Task was destroyed but it is pending!" — and `_stream_video`
never reached the exit of its `async with sem`. `_spawn` holds every background
task; all nineteen call sites go through it.
Losing the peer must stop its work. The connectionstatechange handler popped the
session from a dict and nothing else, so a closed tab went on transcoding for
the full 120 s credit timeout. Measured in the log: 91 s of ffmpeg after the
connection closed. `shutdown_tasks()` now runs on the way out, and the credit
wait checks the channel before sleeping and polls in slices instead of once.
And `await proc.wait()` after `kill()` still deadlocks. ffmpeg outruns a
credit-paced viewer and fills the stdout pipe; stop reading it and the transport
cannot finish closing, SIGKILL or not. Measured against the live node with a
169 MB video, closing the viewer after 20 segments and asking for the next one:
15.1 s then "Server busy" before, 0.1 s / 0.0 s / 0.0 s after.
Chunk replies wait for room on the channel. Eight megabyte-sized chunks answered
as they arrived queued 8 MB with nothing watching — measured at 7.3 MB of
bufferedAmount in milliseconds. Fine on a LAN, minutes of head-of-line delay on
a busy link.
Upload names accept any script. The rule was ASCII-only, so `été.txt` was
refused — and so was `rapport (1).pdf`, which is the form `_free_name` produces
itself, meaning the node rejected names it had chosen. Widened to Unicode with
the C5a and H2 protections intact, plus a refusal of names that lie about
themselves: trailing space or dot, and the right-to-left override. Errors now
name the file, so one bad name no longer fails every upload in flight.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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