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moonfire-nvr/server/db/writer.rs

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// This file is part of Moonfire NVR, a security camera network video recorder.
// Copyright (C) 2020 The Moonfire NVR Authors; see AUTHORS and LICENSE.txt.
// SPDX-License-Identifier: GPL-v3.0-or-later WITH GPL-3.0-linking-exception.
//! Writing recordings and deleting old ones.
use crate::db::{self, CompositeId};
use crate::dir;
use crate::recording::{self, MAX_RECORDING_WALL_DURATION};
use base::clock::{self, Clocks};
use base::shutdown::ShutdownError;
use failure::{bail, format_err, Error};
use fnv::FnvHashMap;
use log::{debug, trace, warn};
use parking_lot::Mutex;
use std::cmp::{self, Ordering};
use std::convert::TryFrom;
use std::io;
use std::mem;
use std::sync::{mpsc, Arc};
use std::thread;
use std::time::Duration as StdDuration;
use time::{Duration, Timespec};
/// Trait to allow mocking out [crate::dir::SampleFileDir] in syncer tests.
/// This is public because it's exposed in the [SyncerChannel] type parameters,
/// not because it's of direct use outside this module.
pub trait DirWriter: 'static + Send {
type File: FileWriter;
fn create_file(&self, id: CompositeId) -> Result<Self::File, nix::Error>;
fn sync(&self) -> Result<(), nix::Error>;
fn unlink_file(&self, id: CompositeId) -> Result<(), nix::Error>;
}
/// Trait to allow mocking out [std::fs::File] in syncer tests.
/// This is public because it's exposed in the [SyncerChannel] type parameters,
/// not because it's of direct use outside this module.
pub trait FileWriter: 'static {
/// As in `std::fs::File::sync_all`.
fn sync_all(&self) -> Result<(), io::Error>;
/// As in `std::io::Writer::write`.
fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error>;
}
impl DirWriter for Arc<dir::SampleFileDir> {
type File = ::std::fs::File;
fn create_file(&self, id: CompositeId) -> Result<Self::File, nix::Error> {
dir::SampleFileDir::create_file(self, id)
}
fn sync(&self) -> Result<(), nix::Error> {
dir::SampleFileDir::sync(self)
}
fn unlink_file(&self, id: CompositeId) -> Result<(), nix::Error> {
dir::SampleFileDir::unlink_file(self, id)
}
}
impl FileWriter for ::std::fs::File {
fn sync_all(&self) -> Result<(), io::Error> {
self.sync_all()
}
fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
io::Write::write(self, buf)
}
}
/// A command sent to a [Syncer].
enum SyncerCommand<F> {
/// Command sent by [SyncerChannel::async_save_recording].
AsyncSaveRecording(CompositeId, recording::Duration, F),
/// Notes that the database has been flushed and garbage collection should be attempted.
/// [start_syncer] sets up a database callback to send this command.
DatabaseFlushed,
/// Command sent by [SyncerChannel::flush].
Flush(mpsc::SyncSender<()>),
}
/// A channel which can be used to send commands to the syncer.
/// Can be cloned to allow multiple threads to send commands.
pub struct SyncerChannel<F>(mpsc::Sender<SyncerCommand<F>>);
impl<F> ::std::clone::Clone for SyncerChannel<F> {
fn clone(&self) -> Self {
SyncerChannel(self.0.clone())
}
}
/// State of the worker thread created by [start_syncer].
struct Syncer<C: Clocks + Clone, D: DirWriter> {
dir_id: i32,
dir: D,
db: Arc<db::Database<C>>,
planned_flushes: std::collections::BinaryHeap<PlannedFlush>,
shutdown_rx: base::shutdown::Receiver,
}
/// A plan to flush at a given instant due to a recently-saved recording's `flush_if_sec` parameter.
struct PlannedFlush {
/// Monotonic time at which this flush should happen.
when: Timespec,
/// Recording which prompts this flush. If this recording is already flushed at the planned
/// time, it can be skipped.
recording: CompositeId,
/// A human-readable reason for the flush, for logs.
reason: String,
/// Senders to drop when this time is reached. This is for test instrumentation; see
/// [SyncerChannel::flush].
senders: Vec<mpsc::SyncSender<()>>,
}
// PlannedFlush is meant for placement in a max-heap which should return the soonest flush. This
// PlannedFlush is greater than other if its when is _less_ than the other's.
impl Ord for PlannedFlush {
fn cmp(&self, other: &Self) -> Ordering {
other.when.cmp(&self.when)
}
}
impl PartialOrd for PlannedFlush {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl PartialEq for PlannedFlush {
fn eq(&self, other: &Self) -> bool {
self.when == other.when
}
}
impl Eq for PlannedFlush {}
/// Starts a syncer for the given sample file directory.
///
/// The lock must not be held on `db` when this is called.
///
/// There should be only one syncer per directory, or 0 if operating in read-only mode.
/// This function will perform the initial rotation synchronously, so that it is finished before
/// file writing starts. Afterward the syncing happens in a background thread.
///
/// Returns a `SyncerChannel` which can be used to send commands (and can be cloned freely) and
/// a `JoinHandle` for the syncer thread. Commands sent on the channel will be executed or retried
/// forever. (TODO: provide some manner of pushback during retry.) At program shutdown, all
/// `SyncerChannel` clones should be dropped and then the handle joined to allow all recordings to
/// be persisted.
///
/// Note that dropping all `SyncerChannel` clones currently includes calling
/// `LockedDatabase::clear_on_flush`, as this function installs a hook to watch database flushes.
/// TODO: add a join wrapper which arranges for the on flush hook to be removed automatically.
pub fn start_syncer<C>(
db: Arc<db::Database<C>>,
shutdown_rx: base::shutdown::Receiver,
dir_id: i32,
) -> Result<(SyncerChannel<::std::fs::File>, thread::JoinHandle<()>), Error>
where
C: Clocks + Clone,
{
let db2 = db.clone();
let (mut syncer, path) = Syncer::new(&db.lock(), shutdown_rx, db2, dir_id)?;
syncer.initial_rotation()?;
let (snd, rcv) = mpsc::channel();
db.lock().on_flush(Box::new({
let snd = snd.clone();
move || {
if let Err(e) = snd.send(SyncerCommand::DatabaseFlushed) {
warn!("Unable to notify syncer for dir {} of flush: {}", dir_id, e);
}
}
}));
Ok((
SyncerChannel(snd),
thread::Builder::new()
.name(format!("sync-{}", path))
.spawn(move || while syncer.iter(&rcv) {})
.unwrap(),
))
}
/// A new retention limit for use in [lower_retention].
pub struct NewLimit {
pub stream_id: i32,
pub limit: i64,
}
/// Immediately deletes recordings if necessary to fit within the given new `retain_bytes` limit.
/// Note this doesn't change the limit in the database; it only deletes files.
/// Pass a limit of 0 to delete all recordings associated with a camera.
///
/// This is expected to be performed from `moonfire-nvr config` when no syncer is running.
/// It potentially flushes the database twice (before and after the actual deletion).
pub fn lower_retention(
db: Arc<db::Database>,
dir_id: i32,
limits: &[NewLimit],
) -> Result<(), Error> {
let db2 = db.clone();
let (_tx, rx) = base::shutdown::channel();
let (mut syncer, _) = Syncer::new(&db.lock(), rx, db2, dir_id)?;
syncer.do_rotation(|db| {
for l in limits {
let (fs_bytes_before, extra);
{
let stream = db
.streams_by_id()
.get(&l.stream_id)
.ok_or_else(|| format_err!("no such stream {}", l.stream_id))?;
fs_bytes_before =
stream.fs_bytes + stream.fs_bytes_to_add - stream.fs_bytes_to_delete;
extra = stream.retain_bytes - l.limit;
}
if l.limit >= fs_bytes_before {
continue;
}
delete_recordings(db, l.stream_id, extra)?;
}
Ok(())
})
}
/// Enqueues deletion of recordings to bring a stream's disk usage within bounds.
/// The next flush will mark the recordings as garbage in the SQLite database, and then they can
/// be deleted from disk.
fn delete_recordings(
db: &mut db::LockedDatabase,
stream_id: i32,
extra_bytes_needed: i64,
) -> Result<(), Error> {
let fs_bytes_needed = {
let stream = match db.streams_by_id().get(&stream_id) {
None => bail!("no stream {}", stream_id),
Some(s) => s,
};
stream.fs_bytes + stream.fs_bytes_to_add - stream.fs_bytes_to_delete + extra_bytes_needed
- stream.retain_bytes
};
let mut fs_bytes_to_delete = 0;
if fs_bytes_needed <= 0 {
debug!(
"{}: have remaining quota of {}",
stream_id,
base::strutil::encode_size(-fs_bytes_needed)
);
return Ok(());
}
let mut n = 0;
db.delete_oldest_recordings(stream_id, &mut |row| {
if fs_bytes_needed >= fs_bytes_to_delete {
fs_bytes_to_delete += db::round_up(i64::from(row.sample_file_bytes));
n += 1;
return true;
}
false
})?;
Ok(())
}
impl<F: FileWriter> SyncerChannel<F> {
/// Asynchronously syncs the given writer, closes it, records it into the database, and
/// starts rotation.
fn async_save_recording(&self, id: CompositeId, wall_duration: recording::Duration, f: F) {
self.0
.send(SyncerCommand::AsyncSaveRecording(id, wall_duration, f))
.unwrap();
}
/// For testing: flushes the syncer, waiting for all currently-queued commands to complete,
/// including the next scheduled database flush (if any). Note this doesn't wait for any
/// post-database flush garbage collection.
pub fn flush(&self) {
let (snd, rcv) = mpsc::sync_channel(0);
self.0.send(SyncerCommand::Flush(snd)).unwrap();
rcv.recv().unwrap_err(); // syncer should just drop the channel, closing it.
}
}
/// Lists files which should be "abandoned" (deleted without ever recording in the database)
/// on opening.
fn list_files_to_abandon(
dir: &dir::SampleFileDir,
streams_to_next: FnvHashMap<i32, i32>,
) -> Result<Vec<CompositeId>, Error> {
let mut v = Vec::new();
let mut d = dir.opendir()?;
for e in d.iter() {
let e = e?;
let id = match dir::parse_id(e.file_name().to_bytes()) {
Ok(i) => i,
Err(_) => continue,
};
let next = match streams_to_next.get(&id.stream()) {
Some(n) => *n,
None => continue, // unknown stream.
};
if id.recording() >= next {
v.push(id);
}
}
Ok(v)
}
impl<C: Clocks + Clone> Syncer<C, Arc<dir::SampleFileDir>> {
fn new(
l: &db::LockedDatabase,
shutdown_rx: base::shutdown::Receiver,
db: Arc<db::Database<C>>,
dir_id: i32,
) -> Result<(Self, String), Error> {
let d = l
.sample_file_dirs_by_id()
.get(&dir_id)
.ok_or_else(|| format_err!("no dir {}", dir_id))?;
let dir = d.get()?;
// Abandon files.
// First, get a list of the streams in question.
let streams_to_next: FnvHashMap<_, _> = l
.streams_by_id()
.iter()
.filter_map(|(&k, v)| {
if v.sample_file_dir_id == Some(dir_id) {
Some((k, v.cum_recordings))
} else {
None
}
})
.collect();
let to_abandon = list_files_to_abandon(&dir, streams_to_next)?;
let mut undeletable = 0;
for &id in &to_abandon {
if let Err(e) = dir.unlink_file(id) {
if e == nix::Error::ENOENT {
warn!("dir: abandoned recording {} already deleted!", id);
} else {
warn!("dir: Unable to unlink abandoned recording {}: {}", id, e);
undeletable += 1;
}
}
}
if undeletable > 0 {
bail!("Unable to delete {} abandoned recordings.", undeletable);
}
Ok((
Syncer {
dir_id,
shutdown_rx,
dir,
db,
planned_flushes: std::collections::BinaryHeap::new(),
},
d.path.clone(),
))
}
/// Rotates files for all streams and deletes stale files from previous runs.
/// Called from main thread.
fn initial_rotation(&mut self) -> Result<(), Error> {
self.do_rotation(|db| {
let streams: Vec<i32> = db.streams_by_id().keys().copied().collect();
for &stream_id in &streams {
delete_recordings(db, stream_id, 0)?;
}
Ok(())
})
}
/// Helper to do initial or retention-lowering rotation. Called from main thread.
fn do_rotation<F>(&mut self, delete_recordings: F) -> Result<(), Error>
where
F: Fn(&mut db::LockedDatabase) -> Result<(), Error>,
{
{
let mut db = self.db.lock();
delete_recordings(&mut *db)?;
db.flush("synchronous deletion")?;
}
let mut garbage: Vec<_> = {
let l = self.db.lock();
let d = l.sample_file_dirs_by_id().get(&self.dir_id).unwrap();
d.garbage_needs_unlink.iter().copied().collect()
};
if !garbage.is_empty() {
// Try to delete files; retain ones in `garbage` that don't exist.
let mut errors = 0;
for &id in &garbage {
if let Err(e) = self.dir.unlink_file(id) {
if e != nix::Error::ENOENT {
warn!("dir: Unable to unlink {}: {}", id, e);
errors += 1;
}
}
}
if errors > 0 {
bail!(
"Unable to unlink {} files (see earlier warning messages for details)",
errors
);
}
self.dir.sync()?;
self.db.lock().delete_garbage(self.dir_id, &mut garbage)?;
self.db.lock().flush("synchronous garbage collection")?;
}
Ok(())
}
}
impl<C: Clocks + Clone, D: DirWriter> Syncer<C, D> {
/// Processes a single command or timeout.
///
/// Returns true iff the loop should continue.
fn iter(&mut self, cmds: &mpsc::Receiver<SyncerCommand<D::File>>) -> bool {
// Wait for a command, the next flush timeout (if specified), or channel disconnect.
let next_flush = self.planned_flushes.peek().map(|f| f.when);
let cmd = match next_flush {
None => match cmds.recv() {
Err(_) => return false, // all cmd senders are gone.
Ok(cmd) => cmd,
},
Some(t) => {
let now = self.db.clocks().monotonic();
// Calculate the timeout to use, mapping negative durations to 0.
let timeout = (t - now)
.to_std()
.unwrap_or_else(|_| StdDuration::new(0, 0));
match self.db.clocks().recv_timeout(&cmds, timeout) {
Err(mpsc::RecvTimeoutError::Disconnected) => return false, // cmd senders gone.
Err(mpsc::RecvTimeoutError::Timeout) => {
self.flush();
return true;
}
Ok(cmd) => cmd,
}
}
};
// Have a command; handle it.
match cmd {
SyncerCommand::AsyncSaveRecording(id, wall_dur, f) => {
if self.save(id, wall_dur, f).is_err() {
return false;
}
}
SyncerCommand::DatabaseFlushed => {
if self.collect_garbage().is_err() {
return false;
}
}
SyncerCommand::Flush(flush) => {
// The sender is waiting for the supplied writer to be dropped. If there's no
// timeout, do so immediately; otherwise wait for that timeout then drop it.
if let Some(mut f) = self.planned_flushes.peek_mut() {
f.senders.push(flush);
}
}
};
true
}
/// Collects garbage (without forcing a sync). Called from worker thread.
fn collect_garbage(&mut self) -> Result<(), ShutdownError> {
trace!("Collecting garbage");
let mut garbage: Vec<_> = {
let l = self.db.lock();
let d = l.sample_file_dirs_by_id().get(&self.dir_id).unwrap();
d.garbage_needs_unlink.iter().copied().collect()
};
if garbage.is_empty() {
return Ok(());
}
let c = &self.db.clocks();
for &id in &garbage {
clock::retry(c, &self.shutdown_rx, &mut || {
if let Err(e) = self.dir.unlink_file(id) {
if e == nix::Error::ENOENT {
warn!("dir: recording {} already deleted!", id);
return Ok(());
}
return Err(e);
}
Ok(())
})?;
}
clock::retry(c, &self.shutdown_rx, &mut || self.dir.sync())?;
clock::retry(c, &self.shutdown_rx, &mut || {
self.db.lock().delete_garbage(self.dir_id, &mut garbage)
})?;
Ok(())
}
/// Saves the given recording and prompts rotation. Called from worker thread.
/// Note that this doesn't flush immediately; SQLite transactions are batched to lower SSD
/// wear. On the next flush, the old recordings will actually be marked as garbage in the
/// database, and shortly afterward actually deleted from disk.
fn save(
&mut self,
id: CompositeId,
wall_duration: recording::Duration,
f: D::File,
) -> Result<(), ShutdownError> {
trace!("Processing save for {}", id);
let stream_id = id.stream();
// Free up a like number of bytes.
clock::retry(&self.db.clocks(), &self.shutdown_rx, &mut || f.sync_all())?;
clock::retry(&self.db.clocks(), &self.shutdown_rx, &mut || {
self.dir.sync()
})?;
let mut db = self.db.lock();
db.mark_synced(id).unwrap();
delete_recordings(&mut db, stream_id, 0).unwrap();
let s = db.streams_by_id().get(&stream_id).unwrap();
let c = db.cameras_by_id().get(&s.camera_id).unwrap();
// Schedule a flush.
let how_soon = Duration::seconds(s.flush_if_sec) - wall_duration.to_tm_duration();
let now = self.db.clocks().monotonic();
let when = now + how_soon;
let reason = format!(
"{} sec after start of {} {}-{} recording {}",
s.flush_if_sec,
wall_duration,
c.short_name,
s.type_.as_str(),
id
);
trace!("scheduling flush in {} because {}", how_soon, &reason);
self.planned_flushes.push(PlannedFlush {
when,
reason,
recording: id,
senders: Vec::new(),
});
Ok(())
}
/// Flushes the database if necessary to honor `flush_if_sec` for some recording.
/// Called from worker thread when one of the `planned_flushes` arrives.
fn flush(&mut self) {
trace!("Flushing");
let mut l = self.db.lock();
// Look through the planned flushes and see if any are still relevant. It's possible
// they're not because something else (e.g., a syncer for a different sample file dir)
// has flushed the database in the meantime.
use std::collections::binary_heap::PeekMut;
while let Some(f) = self.planned_flushes.peek_mut() {
let s = match l.streams_by_id().get(&f.recording.stream()) {
Some(s) => s,
None => {
// Removing streams while running hasn't been implemented yet, so this should
// be impossible.
warn!(
"bug: no stream for {} which was scheduled to be flushed",
f.recording
);
PeekMut::pop(f);
continue;
}
};
if s.cum_recordings <= f.recording.recording() {
// not yet committed.
break;
}
trace!("planned flush ({}) no longer needed", &f.reason);
PeekMut::pop(f);
}
// If there's anything left to do now, try to flush.
let f = match self.planned_flushes.peek() {
None => return,
Some(f) => f,
};
let now = self.db.clocks().monotonic();
if f.when > now {
return;
}
if let Err(e) = l.flush(&f.reason) {
let d = Duration::minutes(1);
warn!(
"flush failure on save for reason {}; will retry after {}: {:?}",
f.reason, d, e
);
self.planned_flushes
.peek_mut()
.expect("planned_flushes is non-empty")
.when = self.db.clocks().monotonic() + Duration::minutes(1);
return;
}
// A successful flush should take care of everything planned.
self.planned_flushes.clear();
}
}
/// Struct for writing a single run (of potentially several recordings) to disk and committing its
/// metadata to the database. `Writer` hands off each recording's state to the syncer when done. It
/// saves the recording to the database (if I/O errors do not prevent this), retries forever,
/// or panics (if further writing on this stream is impossible).
pub struct Writer<'a, C: Clocks + Clone, D: DirWriter> {
dir: &'a D,
db: &'a db::Database<C>,
channel: &'a SyncerChannel<D::File>,
stream_id: i32,
video_sample_entry_id: i32,
state: WriterState<D::File>,
}
enum WriterState<F: FileWriter> {
Unopened,
Open(InnerWriter<F>),
Closed(PreviousWriter),
}
/// State for writing a single recording, used within [Writer].
///
/// Note that the recording created by every `InnerWriter` must be written to the [SyncerChannel]
/// with at least one sample. The sample may have zero duration.
struct InnerWriter<F: FileWriter> {
f: F,
r: Arc<Mutex<db::RecordingToInsert>>,
e: recording::SampleIndexEncoder,
id: CompositeId,
hasher: blake3::Hasher,
/// The start time of this recording, based solely on examining the local clock after frames in
/// this recording were received. Frames can suffer from various kinds of delay (initial
/// buffering, encoding, and network transmission), so this time is set to far in the future on
/// construction, given a real value on the first packet, and decreased as less-delayed packets
/// are discovered. See design/time.md for details.
local_start: recording::Time,
/// A sample which has been written to disk but not added to `index`. Index writes are one
/// sample behind disk writes because the duration of a sample is the difference between its
/// pts and the next sample's pts. A sample is flushed when the next sample is written, when
/// the writer is closed cleanly (the caller supplies the next pts), or when the writer is
/// closed uncleanly (with a zero duration, which the `.mp4` format allows only at the end).
///
/// `unindexed_sample` should always be `Some`, except when a `write` call has aborted on
/// shutdown. In that case, the close will be unable to write the full segment.
unindexed_sample: Option<UnindexedSample>,
}
/// A sample which has been written to disk but not included in the index yet.
/// The index includes the sample's duration, which is calculated from the
/// _following_ sample's pts, so the most recent sample is always unindexed.
#[derive(Copy, Clone)]
struct UnindexedSample {
local_time: recording::Time,
pts_90k: i64, // relative to the start of the run, not a single recording.
len: i32,
is_key: bool,
}
/// State associated with a run's previous recording; used within [Writer].
#[derive(Copy, Clone)]
struct PreviousWriter {
end: recording::Time,
run_offset: i32,
}
impl<'a, C: Clocks + Clone, D: DirWriter> Writer<'a, C, D> {
/// `db` must not be locked.
pub fn new(
dir: &'a D,
db: &'a db::Database<C>,
channel: &'a SyncerChannel<D::File>,
stream_id: i32,
video_sample_entry_id: i32,
) -> Self {
Writer {
dir,
db,
channel,
stream_id,
video_sample_entry_id,
state: WriterState::Unopened,
}
}
/// Opens a new writer.
/// On successful return, `self.state` will be `WriterState::Open(w)` with `w` violating the
/// invariant that `unindexed_sample` is `Some`. The caller (`write`) is responsible for
/// correcting this.
fn open(&mut self, shutdown_rx: &mut base::shutdown::Receiver) -> Result<(), Error> {
let prev = match self.state {
WriterState::Unopened => None,
WriterState::Open(_) => return Ok(()),
WriterState::Closed(prev) => Some(prev),
};
let (id, r) = self.db.lock().add_recording(
self.stream_id,
db::RecordingToInsert {
run_offset: prev.map(|p| p.run_offset + 1).unwrap_or(0),
start: prev
.map(|p| p.end)
.unwrap_or(recording::Time(i64::max_value())),
video_sample_entry_id: self.video_sample_entry_id,
flags: db::RecordingFlags::Growing as i32,
..Default::default()
},
)?;
let f = clock::retry(&self.db.clocks(), shutdown_rx, &mut || {
self.dir.create_file(id)
})?;
self.state = WriterState::Open(InnerWriter {
f,
r,
e: recording::SampleIndexEncoder::default(),
id,
hasher: blake3::Hasher::new(),
local_start: recording::Time(i64::max_value()),
unindexed_sample: None,
});
Ok(())
}
pub fn previously_opened(&self) -> Result<bool, Error> {
Ok(match self.state {
WriterState::Unopened => false,
WriterState::Closed(_) => true,
WriterState::Open(_) => bail!("open!"),
})
}
/// Writes a new frame to this recording.
/// `local_time` should be the local clock's time as of when this packet was received.
pub fn write(
&mut self,
shutdown_rx: &mut base::shutdown::Receiver,
pkt: &[u8],
local_time: recording::Time,
pts_90k: i64,
is_key: bool,
) -> Result<(), Error> {
self.open(shutdown_rx)?;
let w = match self.state {
WriterState::Open(ref mut w) => w,
_ => unreachable!(),
};
// Note w's invariant that `unindexed_sample` is `None` may currently be violated.
// We must restore it on all success or error paths.
if let Some(unindexed) = w.unindexed_sample.take() {
let duration = pts_90k - unindexed.pts_90k;
if duration <= 0 {
w.unindexed_sample = Some(unindexed); // restore invariant.
bail!(
"pts not monotonically increasing; got {} then {}",
unindexed.pts_90k,
pts_90k
);
}
let duration = match i32::try_from(duration) {
Ok(d) => d,
Err(_) => {
w.unindexed_sample = Some(unindexed); // restore invariant.
bail!(
"excessive pts jump from {} to {}",
unindexed.pts_90k,
pts_90k
)
}
};
if let Err(e) = w.add_sample(
duration,
unindexed.len,
unindexed.is_key,
unindexed.local_time,
self.db,
self.stream_id,
) {
w.unindexed_sample = Some(unindexed); // restore invariant.
return Err(e);
}
}
let mut remaining = pkt;
while !remaining.is_empty() {
let written =
match clock::retry(&self.db.clocks(), shutdown_rx, &mut || w.f.write(remaining)) {
Ok(w) => w,
Err(e) => {
// close() will do nothing because unindexed_sample will be None.
log::warn!(
"Abandoning incompletely written recording {} on shutdown",
w.id
);
return Err(e.into());
}
};
remaining = &remaining[written..];
}
w.unindexed_sample = Some(UnindexedSample {
local_time,
pts_90k,
len: i32::try_from(pkt.len()).unwrap(),
is_key,
});
w.hasher.update(pkt);
Ok(())
}
/// Cleanly closes the writer, using a supplied pts of the next sample for the last sample's
/// duration (if known). If `close` is not called, the `Drop` trait impl will close the trait,
/// swallowing errors and using a zero duration for the last sample.
pub fn close(&mut self, next_pts: Option<i64>) -> Result<(), Error> {
self.state = match mem::replace(&mut self.state, WriterState::Unopened) {
WriterState::Open(w) => {
let prev = w.close(self.channel, next_pts, self.db, self.stream_id)?;
WriterState::Closed(prev)
}
s => s,
};
Ok(())
}
}
fn clamp(v: i64, min: i64, max: i64) -> i64 {
std::cmp::min(std::cmp::max(v, min), max)
}
impl<F: FileWriter> InnerWriter<F> {
fn add_sample<C: Clocks + Clone>(
&mut self,
duration_90k: i32,
bytes: i32,
is_key: bool,
pkt_local_time: recording::Time,
db: &db::Database<C>,
stream_id: i32,
) -> Result<(), Error> {
let mut l = self.r.lock();
// design/time.md explains these time manipulations in detail.
let prev_media_duration_90k = l.media_duration_90k;
let media_duration_90k = l.media_duration_90k + duration_90k;
let local_start = cmp::min(
self.local_start,
pkt_local_time - recording::Duration(i64::from(media_duration_90k)),
);
let limit = i64::from(media_duration_90k / 2000); // 1/2000th, aka 500 ppm.
let start = if l.run_offset == 0 {
// Start time isn't anchored to previous recording's end; adjust.
local_start
} else {
l.start
};
let wall_duration_90k = media_duration_90k
+ i32::try_from(clamp(local_start.0 - start.0, -limit, limit)).unwrap();
if wall_duration_90k > i32::try_from(MAX_RECORDING_WALL_DURATION).unwrap() {
bail!(
"Duration {} exceeds maximum {}",
wall_duration_90k,
MAX_RECORDING_WALL_DURATION
);
}
l.wall_duration_90k = wall_duration_90k;
l.start = start;
self.local_start = local_start;
self.e.add_sample(duration_90k, bytes, is_key, &mut l);
drop(l);
db.lock()
.send_live_segment(
stream_id,
db::LiveSegment {
recording: self.id.recording(),
is_key,
media_off_90k: prev_media_duration_90k..media_duration_90k,
},
)
.unwrap();
Ok(())
}
fn close<C: Clocks + Clone>(
mut self,
channel: &SyncerChannel<F>,
next_pts: Option<i64>,
db: &db::Database<C>,
stream_id: i32,
) -> Result<PreviousWriter, Error> {
let unindexed = self.unindexed_sample.take().ok_or_else(|| {
format_err!(
"Unable to add recording {} to database due to aborted write",
self.id
)
})?;
let (last_sample_duration, flags) = match next_pts {
None => (0, db::RecordingFlags::TrailingZero as i32),
Some(p) => (i32::try_from(p - unindexed.pts_90k)?, 0),
};
let blake3 = self.hasher.finalize();
let (run_offset, end);
self.add_sample(
last_sample_duration,
unindexed.len,
unindexed.is_key,
unindexed.local_time,
db,
stream_id,
)?;
// This always ends a live segment.
let wall_duration;
{
let mut l = self.r.lock();
l.flags = flags;
l.local_time_delta = self.local_start - l.start;
l.sample_file_blake3 = Some(*blake3.as_bytes());
wall_duration = recording::Duration(i64::from(l.wall_duration_90k));
run_offset = l.run_offset;
end = l.start + wall_duration;
}
drop(self.r);
channel.async_save_recording(self.id, wall_duration, self.f);
Ok(PreviousWriter { end, run_offset })
}
}
impl<'a, C: Clocks + Clone, D: DirWriter> Drop for Writer<'a, C, D> {
fn drop(&mut self) {
if ::std::thread::panicking() {
// This will probably panic again. Don't do it.
return;
}
if let WriterState::Open(w) = mem::replace(&mut self.state, WriterState::Unopened) {
// Swallow any error. The caller should only drop the Writer without calling close()
// if there's already been an error. The caller should report that. No point in
// complaining again.
let _ = w.close(self.channel, None, self.db, self.stream_id);
}
}
}
#[cfg(test)]
mod tests {
use super::Writer;
use crate::db::{self, CompositeId, VideoSampleEntryToInsert};
use crate::recording;
use crate::testutil;
use base::clock::{Clocks, SimulatedClocks};
use log::{trace, warn};
use parking_lot::Mutex;
use std::collections::VecDeque;
use std::io;
use std::sync::mpsc;
use std::sync::Arc;
#[derive(Clone)]
struct MockDir(Arc<Mutex<VecDeque<MockDirAction>>>);
enum MockDirAction {
Create(
CompositeId,
Box<dyn Fn(CompositeId) -> Result<MockFile, nix::Error> + Send>,
),
Sync(Box<dyn Fn() -> Result<(), nix::Error> + Send>),
Unlink(
CompositeId,
Box<dyn Fn(CompositeId) -> Result<(), nix::Error> + Send>,
),
}
impl MockDir {
fn new() -> Self {
MockDir(Arc::new(Mutex::new(VecDeque::new())))
}
fn expect(&self, action: MockDirAction) {
self.0.lock().push_back(action);
}
fn ensure_done(&self) {
assert_eq!(self.0.lock().len(), 0);
}
}
impl super::DirWriter for MockDir {
type File = MockFile;
fn create_file(&self, id: CompositeId) -> Result<Self::File, nix::Error> {
match self
.0
.lock()
.pop_front()
.expect("got create_file with no expectation")
{
MockDirAction::Create(expected_id, ref f) => {
assert_eq!(id, expected_id);
f(id)
}
_ => panic!("got create_file({}), expected something else", id),
}
}
fn sync(&self) -> Result<(), nix::Error> {
match self
.0
.lock()
.pop_front()
.expect("got sync with no expectation")
{
MockDirAction::Sync(f) => f(),
_ => panic!("got sync, expected something else"),
}
}
fn unlink_file(&self, id: CompositeId) -> Result<(), nix::Error> {
match self
.0
.lock()
.pop_front()
.expect("got unlink_file with no expectation")
{
MockDirAction::Unlink(expected_id, f) => {
assert_eq!(id, expected_id);
f(id)
}
_ => panic!("got unlink({}), expected something else", id),
}
}
}
impl Drop for MockDir {
fn drop(&mut self) {
if !::std::thread::panicking() {
assert_eq!(self.0.lock().len(), 0);
}
}
}
#[derive(Clone)]
struct MockFile(Arc<Mutex<VecDeque<MockFileAction>>>);
enum MockFileAction {
SyncAll(Box<dyn Fn() -> Result<(), io::Error> + Send>),
Write(Box<dyn Fn(&[u8]) -> Result<usize, io::Error> + Send>),
}
impl MockFile {
fn new() -> Self {
MockFile(Arc::new(Mutex::new(VecDeque::new())))
}
fn expect(&self, action: MockFileAction) {
self.0.lock().push_back(action);
}
fn ensure_done(&self) {
assert_eq!(self.0.lock().len(), 0);
}
}
impl super::FileWriter for MockFile {
fn sync_all(&self) -> Result<(), io::Error> {
match self
.0
.lock()
.pop_front()
.expect("got sync_all with no expectation")
{
MockFileAction::SyncAll(f) => f(),
_ => panic!("got sync_all, expected something else"),
}
}
fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
match self
.0
.lock()
.pop_front()
.expect("got write with no expectation")
{
MockFileAction::Write(f) => f(buf),
_ => panic!("got write({:?}), expected something else", buf),
}
}
}
struct Harness {
db: Arc<db::Database<SimulatedClocks>>,
dir_id: i32,
_tmpdir: ::tempfile::TempDir,
dir: MockDir,
channel: super::SyncerChannel<MockFile>,
_shutdown_tx: base::shutdown::Sender,
shutdown_rx: base::shutdown::Receiver,
syncer: super::Syncer<SimulatedClocks, MockDir>,
syncer_rx: mpsc::Receiver<super::SyncerCommand<MockFile>>,
}
fn new_harness(flush_if_sec: i64) -> Harness {
let clocks = SimulatedClocks::new(::time::Timespec::new(0, 0));
let tdb = testutil::TestDb::new_with_flush_if_sec(clocks, flush_if_sec);
let dir_id = *tdb
.db
.lock()
.sample_file_dirs_by_id()
.keys()
.next()
.unwrap();
// This starts a real fs-backed syncer. Get rid of it.
tdb.db.lock().clear_on_flush();
drop(tdb.syncer_channel);
tdb.syncer_join.join().unwrap();
// Start a mock syncer.
let dir = MockDir::new();
let (shutdown_tx, shutdown_rx) = base::shutdown::channel();
let syncer = super::Syncer {
dir_id: *tdb
.db
.lock()
.sample_file_dirs_by_id()
.keys()
.next()
.unwrap(),
dir: dir.clone(),
db: tdb.db.clone(),
planned_flushes: std::collections::BinaryHeap::new(),
shutdown_rx: shutdown_rx.clone(),
};
let (syncer_tx, syncer_rx) = mpsc::channel();
tdb.db.lock().on_flush(Box::new({
let snd = syncer_tx.clone();
move || {
if let Err(e) = snd.send(super::SyncerCommand::DatabaseFlushed) {
warn!("Unable to notify syncer for dir {} of flush: {}", dir_id, e);
}
}
}));
Harness {
dir_id,
dir,
db: tdb.db,
_tmpdir: tdb.tmpdir,
channel: super::SyncerChannel(syncer_tx),
_shutdown_tx: shutdown_tx,
shutdown_rx,
syncer,
syncer_rx,
}
}
fn eio() -> io::Error {
io::Error::new(io::ErrorKind::Other, "got EIO")
}
#[test]
fn excessive_pts_jump() {
testutil::init();
let mut h = new_harness(0);
let video_sample_entry_id =
h.db.lock()
.insert_video_sample_entry(VideoSampleEntryToInsert {
width: 1920,
height: 1080,
pasp_h_spacing: 1,
pasp_v_spacing: 1,
data: [0u8; 100].to_vec(),
rfc6381_codec: "avc1.000000".to_owned(),
})
.unwrap();
let mut w = Writer::new(
&h.dir,
&h.db,
&h.channel,
testutil::TEST_STREAM_ID,
video_sample_entry_id,
);
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new(|_id| Err(nix::Error::EIO)),
));
let f = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new({
let f = f.clone();
move |_id| Ok(f.clone())
}),
));
f.expect(MockFileAction::Write(Box::new(|_| Ok(1))));
f.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(&mut h.shutdown_rx, b"1", recording::Time(1), 0, true)
.unwrap();
let e = w
.write(
&mut h.shutdown_rx,
b"2",
recording::Time(2),
i32::max_value() as i64 + 1,
true,
)
.unwrap_err();
assert!(e.to_string().contains("excessive pts jump"));
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
drop(w);
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
f.ensure_done();
h.dir.ensure_done();
}
/// Tests the database flushing while a syncer is still processing a previous flush event.
#[test]
fn double_flush() {
testutil::init();
let mut h = new_harness(0);
h.db.lock()
.update_retention(&[db::RetentionChange {
stream_id: testutil::TEST_STREAM_ID,
new_record: true,
new_limit: 0,
}])
.unwrap();
// Setup: add a 3-byte recording.
let video_sample_entry_id =
h.db.lock()
.insert_video_sample_entry(VideoSampleEntryToInsert {
width: 1920,
height: 1080,
pasp_h_spacing: 1,
pasp_v_spacing: 1,
data: [0u8; 100].to_vec(),
rfc6381_codec: "avc1.000000".to_owned(),
})
.unwrap();
let mut w = Writer::new(
&h.dir,
&h.db,
&h.channel,
testutil::TEST_STREAM_ID,
video_sample_entry_id,
);
let f = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new({
let f = f.clone();
move |_id| Ok(f.clone())
}),
));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"123");
Ok(3)
})));
f.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(&mut h.shutdown_rx, b"123", recording::Time(2), 0, true)
.unwrap();
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
w.close(Some(1)).unwrap();
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
f.ensure_done();
h.dir.ensure_done();
// Then a 1-byte recording.
let f = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 1),
Box::new({
let f = f.clone();
move |_id| Ok(f.clone())
}),
));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"4");
Ok(1)
})));
f.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(&mut h.shutdown_rx, b"4", recording::Time(3), 1, true)
.unwrap();
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
h.dir.expect(MockDirAction::Unlink(
CompositeId::new(1, 0),
Box::new({
let db = h.db.clone();
move |_| {
// The drop(w) below should cause the old recording to be deleted (moved to
// garbage). When the database is flushed, the syncer forces garbage collection
// including this unlink.
// Do another database flush here, as if from another syncer.
db.lock().flush("another syncer running").unwrap();
Ok(())
}
}),
));
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
drop(w);
trace!("expecting AsyncSave");
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
trace!("expecting planned flush");
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.syncer.planned_flushes.len(), 0);
trace!("expecting DatabaseFlushed");
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
trace!("expecting DatabaseFlushed again");
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed again
f.ensure_done();
h.dir.ensure_done();
// Garbage should be marked collected on the next database flush.
{
let mut l = h.db.lock();
let dir = l.sample_file_dirs_by_id().get(&h.dir_id).unwrap();
assert!(dir.garbage_needs_unlink.is_empty());
assert!(!dir.garbage_unlinked.is_empty());
l.flush("forced gc").unwrap();
let dir = l.sample_file_dirs_by_id().get(&h.dir_id).unwrap();
assert!(dir.garbage_needs_unlink.is_empty());
assert!(dir.garbage_unlinked.is_empty());
}
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
// The syncer should shut down cleanly.
drop(h.channel);
h.db.lock().clear_on_flush();
assert_eq!(
h.syncer_rx.try_recv().err(),
Some(std::sync::mpsc::TryRecvError::Disconnected)
);
assert!(h.syncer.planned_flushes.is_empty());
}
#[test]
fn write_path_retries() {
testutil::init();
let mut h = new_harness(0);
let video_sample_entry_id =
h.db.lock()
.insert_video_sample_entry(VideoSampleEntryToInsert {
width: 1920,
height: 1080,
pasp_h_spacing: 1,
pasp_v_spacing: 1,
data: [0u8; 100].to_vec(),
rfc6381_codec: "avc1.000000".to_owned(),
})
.unwrap();
let mut w = Writer::new(
&h.dir,
&h.db,
&h.channel,
testutil::TEST_STREAM_ID,
video_sample_entry_id,
);
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new(|_id| Err(nix::Error::EIO)),
));
let f = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new({
let f = f.clone();
move |_id| Ok(f.clone())
}),
));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"1234");
Err(eio())
})));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"1234");
Ok(1)
})));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"234");
Err(eio())
})));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"234");
Ok(3)
})));
f.expect(MockFileAction::SyncAll(Box::new(|| Err(eio()))));
f.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(&mut h.shutdown_rx, b"1234", recording::Time(1), 0, true)
.unwrap();
h.dir
.expect(MockDirAction::Sync(Box::new(|| Err(nix::Error::EIO))));
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
drop(w);
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
f.ensure_done();
h.dir.ensure_done();
{
let l = h.db.lock();
let s = l.streams_by_id().get(&testutil::TEST_STREAM_ID).unwrap();
assert_eq!(s.bytes_to_add, 0);
assert_eq!(s.sample_file_bytes, 4);
}
// The syncer should shut down cleanly.
drop(h.channel);
h.db.lock().clear_on_flush();
assert_eq!(
h.syncer_rx.try_recv().err(),
Some(std::sync::mpsc::TryRecvError::Disconnected)
);
assert!(h.syncer.planned_flushes.is_empty());
}
#[test]
fn gc_path_retries() {
testutil::init();
let mut h = new_harness(0);
h.db.lock()
.update_retention(&[db::RetentionChange {
stream_id: testutil::TEST_STREAM_ID,
new_record: true,
new_limit: 0,
}])
.unwrap();
// Setup: add a 3-byte recording.
let video_sample_entry_id =
h.db.lock()
.insert_video_sample_entry(VideoSampleEntryToInsert {
width: 1920,
height: 1080,
pasp_h_spacing: 1,
pasp_v_spacing: 1,
data: [0u8; 100].to_vec(),
rfc6381_codec: "avc1.000000".to_owned(),
})
.unwrap();
let mut w = Writer::new(
&h.dir,
&h.db,
&h.channel,
testutil::TEST_STREAM_ID,
video_sample_entry_id,
);
let f = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new({
let f = f.clone();
move |_id| Ok(f.clone())
}),
));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"123");
Ok(3)
})));
f.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(&mut h.shutdown_rx, b"123", recording::Time(2), 0, true)
.unwrap();
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
w.close(Some(1)).unwrap();
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
f.ensure_done();
h.dir.ensure_done();
// Then a 1-byte recording.
let f = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 1),
Box::new({
let f = f.clone();
move |_id| Ok(f.clone())
}),
));
f.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"4");
Ok(1)
})));
f.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(&mut h.shutdown_rx, b"4", recording::Time(3), 1, true)
.unwrap();
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
h.dir.expect(MockDirAction::Unlink(
CompositeId::new(1, 0),
Box::new({
let db = h.db.clone();
move |_| {
// The drop(w) below should cause the old recording to be deleted (moved to
// garbage). When the database is flushed, the syncer forces garbage collection
// including this unlink.
// This should have already applied the changes to sample file bytes, even
// though the garbage has yet to be collected.
let l = db.lock();
let s = l.streams_by_id().get(&testutil::TEST_STREAM_ID).unwrap();
assert_eq!(s.bytes_to_delete, 0);
assert_eq!(s.bytes_to_add, 0);
assert_eq!(s.sample_file_bytes, 1);
Err(nix::Error::EIO) // force a retry.
}
}),
));
h.dir.expect(MockDirAction::Unlink(
CompositeId::new(1, 0),
Box::new(|_| Ok(())),
));
h.dir
.expect(MockDirAction::Sync(Box::new(|| Err(nix::Error::EIO))));
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
drop(w);
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
f.ensure_done();
h.dir.ensure_done();
// Garbage should be marked collected on the next flush.
{
let mut l = h.db.lock();
let dir = l.sample_file_dirs_by_id().get(&h.dir_id).unwrap();
assert!(dir.garbage_needs_unlink.is_empty());
assert!(!dir.garbage_unlinked.is_empty());
l.flush("forced gc").unwrap();
let dir = l.sample_file_dirs_by_id().get(&h.dir_id).unwrap();
assert!(dir.garbage_needs_unlink.is_empty());
assert!(dir.garbage_unlinked.is_empty());
}
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
// The syncer should shut down cleanly.
drop(h.channel);
h.db.lock().clear_on_flush();
assert_eq!(
h.syncer_rx.try_recv().err(),
Some(std::sync::mpsc::TryRecvError::Disconnected)
);
assert!(h.syncer.planned_flushes.is_empty());
}
#[test]
fn planned_flush() {
testutil::init();
let mut h = new_harness(60); // flush_if_sec=60
// There's a database constraint forbidding a recording starting at t=0, so advance.
h.db.clocks().sleep(time::Duration::seconds(1));
// Setup: add a 3-byte recording.
let video_sample_entry_id =
h.db.lock()
.insert_video_sample_entry(VideoSampleEntryToInsert {
width: 1920,
height: 1080,
pasp_h_spacing: 1,
pasp_v_spacing: 1,
data: [0u8; 100].to_vec(),
rfc6381_codec: "avc1.000000".to_owned(),
})
.unwrap();
let mut w = Writer::new(
&h.dir,
&h.db,
&h.channel,
testutil::TEST_STREAM_ID,
video_sample_entry_id,
);
let f1 = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 0),
Box::new({
let f = f1.clone();
move |_id| Ok(f.clone())
}),
));
f1.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"123");
Ok(3)
})));
f1.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(
&mut h.shutdown_rx,
b"123",
recording::Time(recording::TIME_UNITS_PER_SEC),
0,
true,
)
.unwrap();
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
drop(w);
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 1);
// Flush and let 30 seconds go by.
h.db.lock().flush("forced").unwrap();
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
assert_eq!(h.syncer.planned_flushes.len(), 1);
h.db.clocks().sleep(time::Duration::seconds(30));
// Then, a 1-byte recording.
let mut w = Writer::new(
&h.dir,
&h.db,
&h.channel,
testutil::TEST_STREAM_ID,
video_sample_entry_id,
);
let f2 = MockFile::new();
h.dir.expect(MockDirAction::Create(
CompositeId::new(1, 1),
Box::new({
let f = f2.clone();
move |_id| Ok(f.clone())
}),
));
f2.expect(MockFileAction::Write(Box::new(|buf| {
assert_eq!(buf, b"4");
Ok(1)
})));
f2.expect(MockFileAction::SyncAll(Box::new(|| Ok(()))));
w.write(
&mut h.shutdown_rx,
b"4",
recording::Time(31 * recording::TIME_UNITS_PER_SEC),
1,
true,
)
.unwrap();
h.dir.expect(MockDirAction::Sync(Box::new(|| Ok(()))));
drop(w);
assert!(h.syncer.iter(&h.syncer_rx)); // AsyncSave
assert_eq!(h.syncer.planned_flushes.len(), 2);
assert_eq!(h.syncer.planned_flushes.len(), 2);
let db_flush_count_before = h.db.lock().flushes();
assert_eq!(h.db.clocks().monotonic(), time::Timespec::new(31, 0));
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush (no-op)
assert_eq!(h.db.clocks().monotonic(), time::Timespec::new(61, 0));
assert_eq!(h.db.lock().flushes(), db_flush_count_before);
assert_eq!(h.syncer.planned_flushes.len(), 1);
assert!(h.syncer.iter(&h.syncer_rx)); // planned flush
assert_eq!(h.db.clocks().monotonic(), time::Timespec::new(91, 0));
assert_eq!(h.db.lock().flushes(), db_flush_count_before + 1);
assert_eq!(h.syncer.planned_flushes.len(), 0);
assert!(h.syncer.iter(&h.syncer_rx)); // DatabaseFlushed
f1.ensure_done();
f2.ensure_done();
h.dir.ensure_done();
// The syncer should shut down cleanly.
drop(h.channel);
h.db.lock().clear_on_flush();
assert_eq!(
h.syncer_rx.try_recv().err(),
Some(std::sync::mpsc::TryRecvError::Disconnected)
);
assert!(h.syncer.planned_flushes.is_empty());
}
}
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