Added API endpoint to trigger collection reindex

src/api.rs

@@ -12,7 +12,8 @@ use std::fs;
 use std::io;
 use std::path::*;
 use std::ops::Deref;
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
+use std::sync::mpsc::Sender;
 use typemap;
 use url::percent_encoding::percent_decode;
 
@@ -53,8 +54,8 @@ fn get_auth_secret<T>(db: &T) -> Result<String>
 	Ok(misc.auth_secret.to_owned())
 }
 
-pub fn get_handler(db: Arc<DB>) -> Result<Chain> {
-	let api_handler = get_endpoints(db.clone());
+pub fn get_handler(db: Arc<DB>, index: Arc<Mutex<Sender<index::Command>>>) -> Result<Chain> {
+	let api_handler = get_endpoints(db.clone(), index);
 	let mut api_chain = Chain::new(api_handler);
 
 	let auth_secret = get_auth_secret(db.deref())?;
@@ -71,7 +72,7 @@ pub fn get_handler(db: Arc<DB>) -> Result<Chain> {
 	Ok(api_chain)
 }
 
-fn get_endpoints(db: Arc<DB>) -> Mount {
+fn get_endpoints(db: Arc<DB>, index_channel: Arc<Mutex<Sender<index::Command>>>) -> Mount {
 	let mut api_handler = Mount::new();
 
 	{
@@ -137,6 +138,19 @@ fn get_endpoints(db: Arc<DB>) -> Mount {
 
 			auth_api_mount.mount("/settings/", settings_api_chain);
 		}
+		{
+			let index_channel = index_channel.clone();
+			let mut reindex_router = Router::new();
+			reindex_router.post("/",
+			                    move |_: &mut Request| self::trigger_index(index_channel.deref()),
+			                    "trigger_index");
+
+			let mut reindex_api_chain = Chain::new(reindex_router);
+			let admin_req = AdminRequirement { db: db.clone() };
+			reindex_api_chain.link_around(admin_req);
+
+			auth_api_mount.mount("/trigger_index/", reindex_api_chain);
+		}
 
 		let mut auth_api_chain = Chain::new(auth_api_mount);
 		let auth = AuthRequirement { db: db.clone() };
@@ -450,3 +464,12 @@ fn put_config(request: &mut Request, db: &DB) -> IronResult<Response> {
 	config::amend(db, &config)?;
 	Ok(Response::with(status::Ok))
 }
+
+fn trigger_index(channel: &Mutex<Sender<index::Command>>) -> IronResult<Response> {
+	let channel = channel.lock().unwrap();
+	let channel = channel.deref();
+	if let Err(e) = channel.send(index::Command::REINDEX) {
+		return Err(IronError::new(e, status::InternalServerError));
+	};
+	Ok(Response::with(status::Ok))
+}

src/index.rs

@@ -7,7 +7,8 @@ use diesel::types;
 use regex::Regex;
 use std::fs;
 use std::path::{Path, PathBuf};
-use std::sync::Mutex;
+use std::sync::{Arc, Mutex};
+use std::sync::mpsc::*;
 use std::thread;
 use std::time;
 
@@ -22,6 +23,10 @@ use metadata;
 const INDEX_BUILDING_INSERT_BUFFER_SIZE: usize = 1000; // Insertions in each transaction
 const INDEX_BUILDING_CLEAN_BUFFER_SIZE: usize = 500; // Insertions in each transaction
 
+pub enum Command {
+	REINDEX,
+}
+
 #[derive(Debug, Queryable, Serialize)]
 pub struct Song {
 	#[serde(skip_serializing)]
@@ -384,14 +389,47 @@ pub fn update<T>(db: &T) -> Result<()>
 	Ok(())
 }
 
-pub fn update_loop<T>(db: &T)
+pub fn update_loop<T>(db: &T, command_buffer: Receiver<Command>)
 	where T: ConnectionSource + VFSSource
 {
 	loop {
+		// Wait for a command
+		if let Err(e) = command_buffer.recv() {
+			println!("Error while waiting on index command buffer: {}", e);
+			return;
+		}
+
+		// Flush the buffer to ignore spammy requests
+		loop {
+			match command_buffer.try_recv() {
+				Err(TryRecvError::Disconnected) => {
+					println!("Error while flushing index command buffer");
+					return;
+				}
+				Err(TryRecvError::Empty) => break,
+				Ok(_) => (),
+			}
+		}
+
+		// Do the update
 		if let Err(e) = update(db) {
 			println!("Error while updating index: {}", e);
 		}
+	}
+}
+
+pub fn self_trigger<T>(db: &T, command_buffer: Arc<Mutex<Sender<Command>>>)
+	where T: ConnectionSource
+{
+	loop {
 		{
+			let command_buffer = command_buffer.lock().unwrap();
+			let command_buffer = command_buffer.deref();
+			if let Err(e) = command_buffer.send(Command::REINDEX) {
+				println!("Error while writing to index command buffer: {}", e);
+				return;
+			}
+		}
 		let sleep_duration;
 		{
 			let connection = db.get_connection();
@@ -409,7 +447,6 @@ pub fn update_loop<T>(db: &T)
 		}
 		thread::sleep(time::Duration::from_secs(sleep_duration as u64));
 	}
-	}
 }
 
 fn virtualize_song(vfs: &VFS, mut song: Song) -> Option<Song> {

src/main.rs

@@ -57,7 +57,8 @@ use iron::prelude::*;
 use mount::Mount;
 use staticfile::Static;
 use std::path::Path;
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
+use std::sync::mpsc::channel;
 
 mod api;
 mod config;
@@ -123,17 +124,24 @@ fn run() -> Result<()> {
 		config::overwrite(db.deref(), &config)?;
 	}
 
-	// Begin indexing
+	// Init index
+	let (index_sender, index_receiver) = channel();
+	let index_sender = Arc::new(Mutex::new(index_sender));
 	let db_ref = db.clone();
 	std::thread::spawn(move || {
 		                   let db = db_ref.deref();
-		                   index::update_loop(db);
+		                   index::update_loop(db, index_receiver);
 		                  });
 
+	// Trigger auto-indexing
+	let db_ref = db.clone();
+	let sender_ref = index_sender.clone();
+	std::thread::spawn(move || { index::self_trigger(db_ref.deref(), sender_ref); });
+
 	// Mount API
 	println!("Mounting API");
 	let mut mount = Mount::new();
-	let handler = api::get_handler(db.clone())?;
+	let handler = api::get_handler(db.clone(), index_sender)?;
 	mount.mount("/api/", handler);
 
 	// Mount static files