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gracefully handle bad video_indexes during upgrade

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Dolf reported hitting this problem:

$ sudo -u moonfire-nvr RUST_LOG=info RUST_BACKTRACE=1 release/moonfire-nvr --upgrade
Jan 06 17:10:57.148 INFO Upgrading database from version 0 to version 1...
Jan 06 17:10:57.149 INFO ...database now in journal_mode delete (requested delete).
Jan 06 17:10:57.149 INFO ...from version 0 to version 1
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { description: "zero duration only allowed at end; have 3123 bytes left", cause: None }', /buildslave/rust-buildbot/slave/stable-dist-rustc-cross-host-linux/build/src/libcore/result.rs:837

The indexes were being scanned on upgrade to set the trailing zero flag which
is some sanity checking for /view.mp4 URLs. It's not a big problem to skip it
for some funny recordings to let the update proceed.

Separately, I'll add validation of the pts when writing a recording; it will
report error and end the recording (retrying a second later) rather than write
an unplayable database enty.

Probably also a good time to add a --check to spot database problems such as
this and recording rows without a matching sample file or vice versa.
This commit is contained in:
Scott Lamb 2017-01-06 20:48:06 -08:00
parent a7e1c9473a
commit 21b8e0b6df
1 changed files with 16 additions and 6 deletions
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22
src/upgrade/v0_to_v1.rs
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@ -35,6 +35,7 @@ use error::Error;
use recording;
use rusqlite;
use std::collections::HashMap;
use strutil;
pub fn run(tx: &rusqlite::Transaction) -> Result<(), Error> {
// These create statements match the schema.sql when version 1 was the latest.
@ -101,6 +102,12 @@ struct CameraState {
next_recording_id: i32,
}
fn has_trailing_zero(video_index: &[u8]) -> Result<bool, Error> {
let mut it = recording::SampleIndexIterator::new();
while it.next(video_index)? {}
Ok(it.duration_90k == 0)
}
/// Fills the `recording` and `recording_playback` tables from `old_recording`, returning
/// the `camera_state` map for use by a following call to `fill_cameras`.
fn fill_recording(tx: &rusqlite::Transaction) -> Result<HashMap<i32, CameraState>, Error> {
@ -116,7 +123,8 @@ fn fill_recording(tx: &rusqlite::Transaction) -> Result<HashMap<i32, CameraState
video_sample_entry_id,
sample_file_uuid,
sample_file_sha1,
video_index
video_index,
id
from
old_recording
"#)?;
@ -153,11 +161,13 @@ fn fill_recording(tx: &rusqlite::Transaction) -> Result<HashMap<i32, CameraState
let sample_file_uuid: Vec<u8> = row.get_checked(8)?;
let sample_file_sha1: Vec<u8> = row.get_checked(9)?;
let video_index: Vec<u8> = row.get_checked(10)?;
let trailing_zero = {
let mut it = recording::SampleIndexIterator::new();
while it.next(&video_index)? {}
it.duration_90k == 0
};
let old_id: i32 = row.get_checked(11)?;
let trailing_zero = has_trailing_zero(&video_index).unwrap_or_else(|e| {
warn!("recording {}/{} (sample file {}, formerly recording {}) has corrupt \
video_index: {}",
camera_id, composite_id & 0xFFFF, strutil::hex(&sample_file_uuid), old_id, e);
false
});
let run_id = match camera_state.current_run {
Some((run_id, expected_start)) if expected_start == start_time_90k => run_id,
_ => composite_id,