suppress some "moonfire-nvr check" false positives

In particular, if there are recordings in progress when the process
dies, they may still be around when check runs. They are easily
identifiable by having an id > cum_recordings and get automatically
deleted on startup, so there's no reason to complain about them.

server/db/check.rs

@@ -37,7 +37,7 @@ use crate::raw;
 use crate::recording;
 use failure::Error;
 use fnv::FnvHashMap;
-use log::{info, error};
+use log::{info, error, warn};
 use nix::fcntl::AtFlags;
 use rusqlite::params;
 use crate::schema;
@@ -57,6 +57,7 @@ pub fn run(conn: &rusqlite::Connection, opts: &Options) -> Result<i32, Error> {
         if let Some(diffs) = compare::get_diffs("actual", conn, "expected", &expected)? {
             error!("Schema is not as expected:\n{}", &diffs);
             printed_error = true;
+            warn!("The following analysis may be incorrect or encounter errors due to schema differences.");
         } else {
             println!("Schema is as expected.");
         }
@@ -66,7 +67,7 @@ pub fn run(conn: &rusqlite::Connection, opts: &Options) -> Result<i32, Error> {
     let db_uuid = raw::get_db_uuid(&conn)?;
 
     // Scan directories.
-    let mut streams_by_dir: FnvHashMap<i32, Dir> = FnvHashMap::default();
+    let mut dirs_by_id: FnvHashMap<i32, Dir> = FnvHashMap::default();
     {
         let mut dir_stmt = conn.prepare(r#"
             select d.id, d.path, d.uuid, d.last_complete_open_id, o.uuid
@@ -98,33 +99,43 @@ pub fn run(conn: &rusqlite::Connection, opts: &Options) -> Result<i32, Error> {
             while let Some(row) = rows.next()? {
                 let id = CompositeId(row.get(0)?);
                 let s = streams.entry(id.stream()).or_insert_with(Stream::default);
-                s.entry(id.recording()).or_insert_with(Recording::default).garbage_row = true;
+                s.recordings.entry(id.recording()).or_insert_with(Recording::default).garbage_row =
+                    true;
             }
-            streams_by_dir.insert(dir_id, streams);
+            dirs_by_id.insert(dir_id, streams);
         }
     }
 
     // Scan known streams.
     {
         let mut stmt = conn.prepare(r#"
-            select id, sample_file_dir_id from stream where sample_file_dir_id is not null
+            select
+              id,
+              sample_file_dir_id,
+              cum_recordings
+            from
+              stream
+            where
+              sample_file_dir_id is not null
         "#)?;
         let mut rows = stmt.query(params![])?;
         while let Some(row) = rows.next()? {
             let stream_id = row.get(0)?;
             let dir_id = row.get(1)?;
-            let stream = match streams_by_dir.get_mut(&dir_id) {
+            let cum_recordings = row.get(2)?;
+            let mut stream = match dirs_by_id.get_mut(&dir_id) {
                 None => Stream::default(),
                 Some(d) => d.remove(&stream_id).unwrap_or_else(Stream::default),
             };
+            stream.cum_recordings = Some(cum_recordings);
             printed_error |= compare_stream(conn, stream_id, opts, stream)?;
         }
     }
 
     // Expect the rest to have only garbage.
-    for (&dir_id, streams) in &streams_by_dir {
+    for (&dir_id, streams) in &dirs_by_id {
         for (&stream_id, stream) in streams {
-            for (&recording_id, r) in stream {
+            for (&recording_id, r) in &stream.recordings {
                 let id = CompositeId::new(stream_id, recording_id);
                 if r.recording_row.is_some() || r.playback_row.is_some() ||
                    r.integrity_row || !r.garbage_row {
@@ -166,7 +177,12 @@ struct Recording {
     garbage_row: bool,
 }
 
-type Stream = FnvHashMap<i32, Recording>;
+#[derive(Default)]
+struct Stream {
+    recordings: FnvHashMap<i32, Recording>,
+    cum_recordings: Option<i32>,
+}
+
 type Dir = FnvHashMap<i32, Stream>;
 
 fn summarize_index(video_index: &[u8]) -> Result<RecordingSummary, Error> {
@@ -215,7 +231,7 @@ fn read_dir(d: &dir::SampleFileDir, opts: &Options) -> Result<Dir, Error> {
             nix::sys::stat::fstatat(fd, f, AtFlags::empty())?.st_size as u64
         } else { 0 };
         let stream = dir.entry(id.stream()).or_insert_with(Stream::default);
-        stream.entry(id.recording()).or_insert_with(Recording::default).file = Some(len);
+        stream.recordings.entry(id.recording()).or_insert_with(Recording::default).file = Some(len);
     }
     Ok(dir)
 }
@@ -226,6 +242,7 @@ fn compare_stream(conn: &rusqlite::Connection, stream_id: i32, opts: &Options,
     let start = CompositeId::new(stream_id, 0);
     let end = CompositeId::new(stream_id, i32::max_value());
     let mut printed_error = false;
+    let cum_recordings = stream.cum_recordings.expect("cum_recordings must be set on known stream");
 
     // recording row.
     {
@@ -252,7 +269,7 @@ fn compare_stream(conn: &rusqlite::Connection, stream_id: i32, opts: &Options,
                 video_samples: row.get(4)?,
                 video_sync_samples: row.get(5)?,
             };
-            stream.entry(id.recording())
+            stream.recordings.entry(id.recording())
                   .or_insert_with(Recording::default)
                   .recording_row = Some(s);
         }
@@ -281,7 +298,7 @@ fn compare_stream(conn: &rusqlite::Connection, stream_id: i32, opts: &Options,
                     continue;
                 },
             };
-            stream.entry(id.recording())
+            stream.recordings.entry(id.recording())
                   .or_insert_with(Recording::default)
                   .playback_row = Some(s);
         }
@@ -300,21 +317,36 @@ fn compare_stream(conn: &rusqlite::Connection, stream_id: i32, opts: &Options,
         let mut rows = stmt.query(params![start.0, end.0])?;
         while let Some(row) = rows.next()? {
             let id = CompositeId(row.get(0)?);
-            stream.entry(id.recording())
+            stream.recordings.entry(id.recording())
                   .or_insert_with(Recording::default)
                   .integrity_row = true;
         }
     }
 
-    for (&id, recording) in &stream {
+    for (&id, recording) in &stream.recordings {
         let id = CompositeId::new(stream_id, id);
+
+        // Files should have recording and playback rows if they aren't marked
+        // as garbage (deletion in progress) and aren't newer than
+        // cum_recordings (were being written when the process died).
+        let db_rows_expected = !recording.garbage_row && id.recording() < cum_recordings;
+
         let r = match recording.recording_row {
-            Some(ref r) => r,
+            Some(ref r) => {
+                if !db_rows_expected {
+                    error!("Unexpected recording row for {}: {:#?}", id, recording);
+                    printed_error = true;
+                    continue;
+                }
+                r
+            },
             None => {
-                if !recording.garbage_row || recording.playback_row.is_some() ||
-                   recording.integrity_row {
+                if db_rows_expected {
                     error!("Missing recording row for {}: {:#?}", id, recording);
                     printed_error = true;
+                } else if recording.playback_row.is_some() {
+                    error!("Unexpected playback row for {}: {:#?}", id, recording);
+                    printed_error = true;
                 }
                 continue;
             },