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siftlode/backend/tests/test_plex_hls_file_route.py
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peter dc4e8b9fcd fix(plex): playback sessions per viewer, bounded in total; a fair share of subtitle passes
HLS sessions were keyed by the item, so a second account opening the same
film killed the first one's session; the displaced player reclaimed at its
playhead and evicted the other in turn. The registry is now keyed by
(viewer, rating_key), segment requests resolve by both, and the session
directory carries the viewer (the orphan sweep still recognises the older
shapes).

Only transcodes counted toward a cap, so remuxes — each a whole segmented
copy of the film on the scratch volume — were bounded by the library size.
Three bounds now apply after every start, each dropping the least recently
used: two sessions per account, the transcode cap, and a new admin knob,
plex_max_sessions (default 8), over every session. A superseded session
request returns at once, since it waits on the killed ffmpeg, so an account
cannot park more request workers than it may hold sessions.

The subtitle extractor's full-pass slots were global and minutes long each;
one account opening subtitles on film after film could hold them all. An
account may now hold three of the six, and still gets windows past that.
2026-09-19 07:16:17 +02:00

337 lines
16 KiB
Python

"""An HLS artifact request names the session it belongs to, and gets nothing else.
Sessions are keyed by rating_key ALONE, while a session's directory is per (key, offset, tag). So a
seek-restart — or a second viewer of the same item — replaces the registered session, and the old
viewer's next request for `seg_12.ts`, resolved by rating_key, was answered 200 with the NEW
session's twelfth segment: bytes produced from a different `-ss` offset under `-copyts`, i.e. a
timeline the client is not on. Wrong content with a success status is the one failure a player cannot
notice, and the reclaim-on-404 added in round 4 could never fire on it (deep-review round 5).
No `db` fixture: the route reads nothing from the database (its own `Depends(get_db)` went with the
removed auto-start, and `current_user` is overridden wholesale), so these must not sit in the DB
lane — there they SKIP on a machine with no Postgres while pytest prints green (round 6).
"""
import time
import pytest
from fastapi.testclient import TestClient
import app.state as state
from app.auth import current_user
from app.main import app
from app.models import User
from app.plex import stream as plex_stream
class _Proc:
def __init__(self, running: bool = False):
self.running = running
def poll(self):
return None if self.running else 0
def terminate(self):
pass
def wait(self, timeout=None):
return 0
VIEWER = 41 # the id of the account the test client is signed in as
class _Session:
def __init__(self, session_id: str, directory, running: bool = False, audio_langs=None):
self.id = session_id
self.dir = directory
self.proc = _Proc(running)
self.last_access = time.time()
# The real session derives both of these from the argv it spawned; the guard reads
# `variants` to tell a name this session can produce from one only the OTHER argv branch
# writes, so a stand-in without it would test a shape that cannot exist.
self.variants = plex_stream.session_variants(audio_langs)
self.entry = "master.m3u8" if self.variants else "index.m3u8"
@pytest.fixture
def sessions(monkeypatch):
live: dict = {}
monkeypatch.setattr(plex_stream, "_sessions", live)
return live
@pytest.fixture
def client(monkeypatch):
monkeypatch.setattr(state, "_configured_cache", True)
user = User(id=VIEWER, email="hls@example.com")
app.dependency_overrides[current_user] = lambda: user
try:
yield TestClient(app)
finally:
app.dependency_overrides.pop(current_user, None)
def test_a_segment_is_served_from_the_session_the_url_names(client, tmp_path, sessions):
d = tmp_path / "m1_0_0_+0.00"
d.mkdir()
(d / "seg_11.ts").write_bytes(b"") # its predecessor, so seg_12 is the next one
(d / "seg_12.ts").write_bytes(b"mine")
sessions[(VIEWER, "m1")] = _Session("sid-a", d)
r = client.get("/api/plex/stream/m1/hls/sid-a/seg_12.ts")
assert r.status_code == 200, r.text
assert r.content == b"mine"
def test_another_viewers_session_of_the_same_item_is_not_this_viewers(client, tmp_path, sessions):
"""Sessions are per viewer: a second account playing the same film has its own, and knowing its
id does not make it yours — resolution is by (viewer, item) before the id is compared."""
d = tmp_path / "m1_u7_0_0_+0.00"
d.mkdir()
(d / "index.m3u8").write_bytes(b"#EXTM3U")
sessions[(7, "m1")] = _Session("sid-a", d)
r = client.get("/api/plex/stream/m1/hls/sid-a/index.m3u8")
assert r.status_code == 404, r.text
def test_a_segment_of_a_replaced_session_is_a_404_not_the_new_sessions_bytes(
client, tmp_path, sessions
):
"""Viewer A is at 0:00; viewer B seeks to 25:00 and their session takes the registry slot. A's
next segment must fail honestly — the player reclaims at the playhead — not arrive as B's."""
theirs = tmp_path / "m1_1500_0_+0.00"
theirs.mkdir()
(theirs / "seg_11.ts").write_bytes(b"")
(theirs / "seg_12.ts").write_bytes(b"theirs")
sessions[(VIEWER, "m1")] = _Session("sid-b", theirs)
r = client.get("/api/plex/stream/m1/hls/sid-a/seg_12.ts")
assert r.status_code == 404, r.text
assert b"theirs" not in r.content
def test_a_playlist_with_no_live_session_is_a_404_not_a_silent_restart_at_zero(
client, monkeypatch, sessions
):
"""The entry playlist used to auto-start a session when none was registered — always at 0.0,
silently throwing away the viewer's position. A 404 sends the player through its own reclaim,
which restarts at the playhead."""
started: list[float] = []
monkeypatch.setattr(
plex_stream,
"start_session",
lambda *a, **k: started.append(a[3] if len(a) > 3 else 0.0),
)
r = client.get("/api/plex/stream/m1/hls/sid-gone/index.m3u8")
assert r.status_code == 404, r.text
assert started == []
def test_a_segment_that_will_never_arrive_fails_at_once(client, tmp_path, sessions):
"""`stream_hls_file` is a SYNC route: it runs on the ~40-slot threadpool and holds a pooled DB
connection while it waits. It used to poll out the whole 20 s for a name that could never appear
— an ordinary seek past the produced region was enough to park a worker and a connection, and
forty hopeless names parked the API (deep-review round 5). ffmpeg writes segments in order, so a
segment whose predecessor is absent is not the next one, and that is knowable at once — even
while ffmpeg is still running, which is the case `proc` alone cannot shorten."""
d = tmp_path / "m1_0_0_+0.00"
d.mkdir()
(d / "seg_0.ts").write_bytes(b"x") # the session is producing; seg_99999 is simply not next
sessions[(VIEWER, "m1")] = _Session("sid-a", d, running=True)
started = time.monotonic()
r = client.get("/api/plex/stream/m1/hls/sid-a/seg_99999.ts")
elapsed = time.monotonic() - started
assert r.status_code == 404, r.text
# The wait is 20 s; anything in that neighbourhood means the producer's exit was not consulted.
assert elapsed < 2.0, f"waited {elapsed:.1f}s for a segment that can never arrive"
@pytest.mark.parametrize(
"name",
[
"seg_0_9000.ts", # the VIDEO rendition of a multi-audio session: variant 0, segment 9000
"seg_a0_9000.ts", # the first audio rendition: `name:a0` from -var_stream_map
],
)
def test_a_multi_audio_segment_beyond_the_region_fails_at_once_too(
client, tmp_path, sessions, name
):
"""The round-5 guard read `seg_<seq>_<variant>.ts`, but ffmpeg substitutes `%v` FIRST — so the
real names are `seg_<variant>_<seq>.ts` and every multi-audio request fell through to the full
20 s wait: the video rendition because its variant "0" parsed as segment 0, the audio renditions
(`a0`, `a1`) because they did not parse at all. Dual-audio is the common shape in this library,
so the guard was inert exactly where it was needed (round 6)."""
d = tmp_path / "m1_0_multi_+0.00"
d.mkdir()
(d / "seg_0_0.ts").write_bytes(b"x")
(d / "seg_a0_0.ts").write_bytes(b"x")
sessions[(VIEWER, "m1")] = _Session("sid-a", d, running=True, audio_langs=["hu", "en"])
started = time.monotonic()
r = client.get(f"/api/plex/stream/m1/hls/sid-a/{name}")
elapsed = time.monotonic() - started
assert r.status_code == 404, r.text
assert elapsed < 2.0, f"waited {elapsed:.1f}s for {name}"
def test_a_multi_audio_segment_whose_predecessor_exists_is_served(client, tmp_path, sessions):
"""The other half of the same rule: reading the names correctly must not start refusing real
ones. `seg_a0_1.ts` follows `seg_a0_0.ts` — the previous SEGMENT of that rendition, not the
previous variant."""
d = tmp_path / "m1_0_multi_+0.00"
d.mkdir()
(d / "seg_a0_0.ts").write_bytes(b"x")
(d / "seg_a0_1.ts").write_bytes(b"audio")
sessions[(VIEWER, "m1")] = _Session("sid-a", d, running=True, audio_langs=["hu", "en"])
r = client.get("/api/plex/stream/m1/hls/sid-a/seg_a0_1.ts")
assert r.status_code == 200, r.text
assert r.content == b"audio"
def test_a_name_the_session_cannot_produce_fails_at_once(client, tmp_path, sessions):
"""The guard was a blocklist: anything that was not a single-audio segment name was waved
through to the timeout, so `GET …/anything.m3u8` still parked a worker for the full 30 s — and
the route comment claimed a flood of hopeless names was what it prevented. A session produces
its playlists and its segments and nothing else, so any other name is answerable now."""
d = tmp_path / "m1_0_0_+0.00"
d.mkdir()
sessions[(VIEWER, "m1")] = _Session("sid-a", d, running=True)
started = time.monotonic()
r = client.get("/api/plex/stream/m1/hls/sid-a/nope.m3u8")
elapsed = time.monotonic() - started
assert r.status_code == 404, r.text
assert elapsed < 2.0, f"waited {elapsed:.1f}s for a playlist this session never writes"
@pytest.mark.parametrize("digits", [100, 5000])
def test_an_absurd_segment_index_is_a_404_not_a_500(client, tmp_path, sessions, digits):
"""`int()` on an unbounded digit run raises ValueError past 4300 digits, and only OSError was
caught — so a long enough name reached the client as a 500 with a traceback. Same bug class the
subtitle routes were bounded for; the answer is the same 404 any other unproducible name gets."""
d = tmp_path / "m1_0_0_+0.00"
d.mkdir()
sessions[(VIEWER, "m1")] = _Session("sid-a", d, running=True)
r = client.get(f"/api/plex/stream/m1/hls/sid-a/seg_{'9' * digits}.ts")
assert r.status_code == 404, r.text
def test_a_session_torn_down_during_the_read_is_a_404_not_a_500(
client, monkeypatch, tmp_path, sessions
):
"""`_kill` rmtrees the whole directory and nothing holds `_lock` across the wait and the read,
so the file can vanish in between — on every seek-restart, since `loadSession` awaits the new
session before destroying the old hls instance. The player's recovery is keyed on the 404
STATUS, so a 500 here skipped the reclaim and ended playback with "couldn't play"."""
d = tmp_path / "m1_0_0_+0.00"
d.mkdir()
(d / "seg_11.ts").write_bytes(b"")
sessions[(VIEWER, "m1")] = _Session("sid-a", d)
# The file existed when the wait checked, and is gone by the time the route reads it.
monkeypatch.setattr(plex_stream, "wait_for", lambda *a, **k: True)
r = client.get("/api/plex/stream/m1/hls/sid-a/seg_12.ts")
assert r.status_code == 404, r.text
def test_a_dead_producer_is_not_waited_out(client, tmp_path, sessions):
"""The route passes `proc` to `wait_for`. Without it a session whose ffmpeg has already exited
— a finished remux, a VAAPI init refusal — polls the whole 20 s for a segment that will never
be written, holding a threadpool worker and its pooled DB connection. The predecessor IS on
disk here, so `artifact_may_arrive` says yes and only `proc` can end the wait."""
d = tmp_path / "m1_0_0_+0.00"
d.mkdir()
(d / "seg_5.ts").write_bytes(b"x")
sessions[(VIEWER, "m1")] = _Session("sid-a", d, running=False)
started = time.monotonic()
r = client.get("/api/plex/stream/m1/hls/sid-a/seg_6.ts")
elapsed = time.monotonic() - started
assert r.status_code == 404, r.text
assert elapsed < 2.0, f"waited {elapsed:.1f}s on a producer that had already exited"
@pytest.mark.parametrize("audio_langs", [None, ["hu", "en"]])
def test_the_name_ffmpeg_is_asked_for_is_a_name_the_guard_understands(tmp_path, audio_langs):
"""One vocabulary, enforced. `segment_name` is what the warm-up and the PTS probe wait for, what
the argv's own `-hls_segment_filename` pattern is built from, and what `artifact_may_arrive`
parses back — they were three separate statements of the layout and two of them were wrong. Pin
them to each other instead."""
sess = _Session("sid", tmp_path, audio_langs=audio_langs)
variant = sess.variants[0] if sess.variants else None
name = plex_stream.segment_name(3, variant)
prev = plex_stream.segment_name(2, variant)
assert not plex_stream.artifact_may_arrive(sess, name)
(tmp_path / prev).write_bytes(b"x")
assert plex_stream.artifact_may_arrive(sess, name)
def test_the_argv_asks_for_exactly_the_names_the_guard_accepts(tmp_path):
"""The producer and the parser, pinned to each other through the argv itself.
Round 6's HIGH was a guard that read `seg_%v_%d.ts` sequence-first, so it was inert on every
multi-audio item, and a warm-up that waited 8 s for a name ffmpeg never writes. The fix was to
give the layout one spelling — but a comment saying so is what had just failed, so assert that
the `-hls_segment_filename` pattern in the real argv is literally what `segment_name` produces,
and that every playlist the argv names is one `playlist_names` accepts."""
for audio_langs in (None, ["hu", "en", "de"]):
args = plex_stream._ffmpeg_cmd(
tmp_path / "in.mkv", 0.0, tmp_path, 0, 0.0, audio_langs, loudnorm=False
)
variants = plex_stream.session_variants(audio_langs)
sess = _Session("sid", tmp_path, audio_langs=audio_langs)
# The two patterns in the argv are the vocabulary's own spelling, `%d`/`%v` and all.
seg_pattern = args[args.index("-hls_segment_filename") + 1]
pl_pattern = args[-1].rsplit("/", 1)[-1].rsplit("\\", 1)[-1]
if variants:
assert seg_pattern.endswith(plex_stream.segment_name("%d", "%v")), seg_pattern
assert pl_pattern == plex_stream.variant_playlist_name("%v"), pl_pattern
assert args[args.index("-master_pl_name") + 1] == plex_stream._MASTER_PL
else:
assert seg_pattern.endswith(plex_stream.segment_name("%d")), seg_pattern
assert pl_pattern == plex_stream._INDEX_PL, pl_pattern
assert "-master_pl_name" not in args
# And every name those patterns can actually expand to is one the guard lets through — the
# entry playlist hls.js is handed included, since a session whose own manifest is refused
# cannot start at all.
for v in variants or (None,):
assert plex_stream.artifact_may_arrive(sess, plex_stream.segment_name(0, v))
if v is not None:
assert plex_stream.artifact_may_arrive(sess, plex_stream.variant_playlist_name(v))
assert plex_stream.artifact_may_arrive(sess, sess.entry)
def test_a_name_only_the_other_argv_branch_writes_is_refused_at_once(tmp_path, client, sessions):
"""The guard is keyed to THIS session's vocabulary, not to HLS in general.
The two argv branches are disjoint: a single-audio session is given `seg_%d.ts` + `index.m3u8`
and no `%v` at all, so `master.m3u8`, `stream_*.m3u8` and every `seg_<variant>_<n>.ts` are names
it can never write — and vice versa. Accepting the union read them as "an HLS name, so wait and
see", and each one then held a threadpool worker and its pooled DB connection for the full
timeout: measured through this route against a live single-audio session, `master.m3u8` took
30.0 s and `seg_a0_0.ts` 20.1 s to answer 404 (deep-review round 7)."""
single = tmp_path / "m1_0_0_+0.00"
single.mkdir()
sessions[(VIEWER, "m1")] = _Session("sid-a", single, running=True)
multi = tmp_path / "m2_0_multi_+0.00"
multi.mkdir()
sessions[(VIEWER, "m2")] = _Session("sid-b", multi, running=True, audio_langs=["hu", "en"])
# Each of these belongs to the other shape (or to no shape at all) and must be refused without
# a wait — the assertion is the ELAPSED time as much as the status.
for key, sid, names in (
("m1", "sid-a", ["master.m3u8", "stream_0.m3u8", "seg_0_0.ts", "seg_zzzz_0.ts"]),
("m2", "sid-b", ["index.m3u8", "seg_0.ts", "seg_a9_0.ts", "stream_zz.m3u8"]),
):
for name in names:
started = time.monotonic()
r = client.get(f"/api/plex/stream/{key}/hls/{sid}/{name}")
elapsed = time.monotonic() - started
assert r.status_code == 404, f"{name}: {r.text}"
assert elapsed < 2.0, (
f"{name}: waited {elapsed:.1f}s for a name this session cannot write"
)
# And the control: the names each session CAN write are still waited for, not refused.
assert plex_stream.artifact_may_arrive(sessions[(VIEWER, "m1")], "index.m3u8")
assert plex_stream.artifact_may_arrive(sessions[(VIEWER, "m1")], "seg_0.ts")
assert plex_stream.artifact_may_arrive(sessions[(VIEWER, "m2")], "master.m3u8")
assert plex_stream.artifact_may_arrive(sessions[(VIEWER, "m2")], "stream_a1.m3u8")
assert plex_stream.artifact_may_arrive(sessions[(VIEWER, "m2")], "seg_a1_0.ts")