Moved database insertions to separate threads from the file crawl

src/index/update.rs

@@ -9,6 +9,7 @@ use regex::Regex;
 use std::fs;
 use std::path::Path;
 use std::time;
+use std::sync::mpsc::*;
 
 use crate::config::MiscSettings;
 use crate::db::{directories, misc_settings, songs, DB};
@@ -61,63 +62,29 @@ struct NewDirectory {
 }
 
 struct IndexUpdater {
-	new_songs: Vec<NewSong>,
-	new_directories: Vec<NewDirectory>,
-	db: DB,
+	directory_sender: Sender<NewDirectory>,
+	song_sender: Sender<NewSong>,
 	album_art_pattern: Regex,
 }
 
 impl IndexUpdater {
 	#[cfg_attr(feature = "profile-index", flame)]
-	fn new(db: DB, album_art_pattern: Regex) -> Result<IndexUpdater> {
-		let mut new_songs = Vec::new();
-		let mut new_directories = Vec::new();
-		new_songs.reserve_exact(INDEX_BUILDING_INSERT_BUFFER_SIZE);
-		new_directories.reserve_exact(INDEX_BUILDING_INSERT_BUFFER_SIZE);
+	fn new(album_art_pattern: Regex, directory_sender: Sender<NewDirectory>, song_sender: Sender<NewSong>) -> Result<IndexUpdater> {
 		Ok(IndexUpdater {
-			new_songs,
-			new_directories,
-			db,
+			directory_sender,
+			song_sender,
 			album_art_pattern,
 		})
 	}
 
-	#[cfg_attr(feature = "profile-index", flame)]
-	fn flush_songs(&mut self) -> Result<()> {
-		let connection = self.db.connect()?;
-		diesel::insert_into(songs::table)
-			.values(&self.new_songs)
-			.execute(&*connection)?; // TODO https://github.com/diesel-rs/diesel/issues/1822
-		self.new_songs.clear();
-		Ok(())
-	}
-
-	#[cfg_attr(feature = "profile-index", flame)]
-	fn flush_directories(&mut self) -> Result<()> {
-		let connection = self.db.connect()?;
-		diesel::insert_into(directories::table)
-			.values(&self.new_directories)
-			.execute(&*connection)?; // TODO https://github.com/diesel-rs/diesel/issues/1822
-		self.new_directories.clear();
-		Ok(())
-	}
-
 	#[cfg_attr(feature = "profile-index", flame)]
 	fn push_song(&mut self, song: NewSong) -> Result<()> {
-		if self.new_songs.len() >= self.new_songs.capacity() {
-			self.flush_songs()?;
-		}
-		self.new_songs.push(song);
-		Ok(())
+		self.song_sender.send(song).map_err(Error::new)
 	}
 
 	#[cfg_attr(feature = "profile-index", flame)]
 	fn push_directory(&mut self, directory: NewDirectory) -> Result<()> {
-		if self.new_directories.len() >= self.new_directories.capacity() {
-			self.flush_directories()?;
-		}
-		self.new_directories.push(directory);
-		Ok(())
+		self.directory_sender.send(directory).map_err(Error::new)
 	}
 
 	fn get_artwork(&self, dir: &Path) -> Result<Option<String>> {
@@ -319,11 +286,78 @@ pub fn populate(db: &DB) -> Result<()> {
 		album_art_pattern = Regex::new(&settings.index_album_art_pattern)?;
 	}
 
-	let mut updater = IndexUpdater::new(db.clone(), album_art_pattern)?;
+	let (directory_sender, directory_receiver) = channel();
+	let directories_db = db.clone();
+	std::thread::spawn(move || {
+		insert_directories(directory_receiver, directories_db);
+	});
+
+	let (song_sender, song_receiver) = channel();
+	let songs_db = db.clone();
+	std::thread::spawn(move || {
+		insert_songs(song_receiver, songs_db);
+	});
+
+	let mut updater = IndexUpdater::new(album_art_pattern, directory_sender, song_sender)?;
 	for target in mount_points.values() {
 		updater.populate_directory(None, target.as_path())?;
 	}
-	updater.flush_songs()?;
-	updater.flush_directories()?;
+
 	Ok(())
 }
+
+fn insert_songs(receiver: Receiver<NewSong>, db: DB) {
+	let mut new_entries = Vec::new();
+	new_entries.reserve_exact(INDEX_BUILDING_INSERT_BUFFER_SIZE);
+
+	loop {
+		match receiver.recv() {
+			Ok(s) => {
+				new_entries.push(s);
+				if new_entries.len() >= INDEX_BUILDING_INSERT_BUFFER_SIZE {
+					let connection = db.connect().unwrap();
+					diesel::insert_into(songs::table)
+					.values(&new_entries)
+					.execute(&*connection).unwrap(); // TODO https://github.com/diesel-rs/diesel/issues/1822
+					new_entries.clear();
+				}
+			},
+			Err(_) => break,
+		}
+	}
+
+	if new_entries.len() > 0 {
+		let connection = db.connect().unwrap();
+		diesel::insert_into(songs::table)
+			.values(&new_entries)
+			.execute(&*connection).unwrap();
+	}
+}
+
+fn insert_directories(receiver: Receiver<NewDirectory>, db: DB) {
+	let mut new_entries = Vec::new();
+	new_entries.reserve_exact(INDEX_BUILDING_INSERT_BUFFER_SIZE);
+
+	loop {
+		match receiver.recv() {
+			Ok(s) => {
+				new_entries.push(s);
+				if new_entries.len() >= INDEX_BUILDING_INSERT_BUFFER_SIZE {
+					let connection = db.connect().unwrap();
+					diesel::insert_into(directories::table)
+					.values(&new_entries)
+					.execute(&*connection).unwrap(); // TODO https://github.com/diesel-rs/diesel/issues/1822
+					new_entries.clear();
+				}
+			},
+			Err(_) => break,
+		}
+	}
+
+	if new_entries.len() > 0 {
+		let connection = db.connect().unwrap();
+		diesel::insert_into(directories::table)
+			.values(&new_entries)
+			.execute(&*connection).unwrap();
+	}
+}