added hot-reload of the config file

Cargo.lock

@@ -473,6 +473,29 @@ name = "indexmap"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "inotify"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "inotify-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "inotify-sys"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "iovec"
 version = "0.1.2"
@@ -598,6 +621,16 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mio-uds"
+version = "0.6.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "miow"
 version = "0.2.1"
@@ -925,6 +958,7 @@ version = "0.1.0"
 dependencies = [
  "env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "inotify 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mpris 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1257,12 +1291,28 @@ dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-fs 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-threadpool 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-udp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "tokio-codec"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1283,6 +1333,16 @@ dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-fs"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-io"
 version = "0.1.11"
@@ -1310,6 +1370,14 @@ dependencies = [
  "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-sync"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-tcp"
 version = "0.1.3"
@@ -1351,6 +1419,37 @@ dependencies = [
  "tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-udp"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "tokio-uds"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "try-lock"
 version = "0.2.2"
@@ -1562,6 +1661,8 @@ dependencies = [
 "checksum ident_case 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c9826188e666f2ed92071d2dadef6edc430b11b158b5b2b3f4babbcc891eaaa"
 "checksum idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
 "checksum indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7e81a7c05f79578dbc15793d8b619db9ba32b4577003ef3af1a91c416798c58d"
+"checksum inotify 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "24e40d6fd5d64e2082e0c796495c8ef5ad667a96d03e5aaa0becfd9d47bcbfb8"
+"checksum inotify-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e74a1aa87c59aeff6ef2cc2fa62d41bc43f54952f55652656b18a02fd5e356c0"
 "checksum iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dbe6e417e7d0975db6512b90796e8ce223145ac4e33c377e4a42882a0e88bb08"
 "checksum itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1306f3464951f30e30d12373d31c79fbd52d236e5e896fd92f96ec7babbbe60b"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
@@ -1578,6 +1679,7 @@ dependencies = [
 "checksum mime 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)" = "3e27ca21f40a310bd06d9031785f4801710d566c184a6e15bad4f1d9b65f9425"
 "checksum mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)" = "30de2e4613efcba1ec63d8133f344076952090c122992a903359be5a4f99c3ed"
 "checksum mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)" = "71646331f2619b1026cc302f87a2b8b648d5c6dd6937846a16cc8ce0f347f432"
+"checksum mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "966257a94e196b11bb43aca423754d87429960a768de9414f3691d6957abf125"
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
 "checksum mpris 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b8a00ae9537d355ab18532a7cf325c7177fb0dcb82851c82228fcaf9815f698d"
 "checksum native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ff8e08de0070bbf4c31f452ea2a70db092f36f6f2e4d897adf5674477d488fb2"
@@ -1651,13 +1753,18 @@ dependencies = [
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum tokio 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "e0500b88064f08bebddd0c0bed39e19f5c567a5f30975bee52b0c0d3e2eeb38c"
+"checksum tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c501eceaf96f0e1793cf26beb63da3d11c738c4a943fdf3746d81d64684c39f"
 "checksum tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "331c8acc267855ec06eb0c94618dcbbfea45bed2d20b77252940095273fb58f6"
 "checksum tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "30c6dbf2d1ad1de300b393910e8a3aa272b724a400b6531da03eed99e329fbf0"
+"checksum tokio-fs 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0e9cbbc8a3698b7ab652340f46633364f9eaa928ddaaee79d8b8f356dd79a09d"
 "checksum tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "b53aeb9d3f5ccf2ebb29e19788f96987fa1355f8fe45ea193928eaaaf3ae820f"
 "checksum tokio-reactor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "afbcdb0f0d2a1e4c440af82d7bbf0bf91a8a8c0575bcd20c05d15be7e9d3a02f"
+"checksum tokio-sync 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c73850a5ad497d73ccfcfc0ffb494a4502d93f35cb475cfeef4fcf2916d26040"
 "checksum tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1d14b10654be682ac43efee27401d792507e30fd8d26389e1da3b185de2e4119"
 "checksum tokio-threadpool 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "c3fd86cb15547d02daa2b21aadaf4e37dee3368df38a526178a5afa3c034d2fb"
 "checksum tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "2910970404ba6fa78c5539126a9ae2045d62e3713041e447f695f41405a120c6"
+"checksum tokio-udp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "66268575b80f4a4a710ef83d087fdfeeabdce9b74c797535fbac18a2cb906e92"
+"checksum tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "037ffc3ba0e12a0ab4aca92e5234e0dedeb48fddf6ccd260f1f150a36a9f2445"
 "checksum try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7f4765f83163b74f957c797ad9253caf97f103fb064d3999aea9568d09fc8a33"

Cargo.toml

@@ -16,3 +16,4 @@ failure = "0.1.5"
 log = "0.4"
 env_logger = "0.6"
 regex = "1.1.0"
+inotify = "0.7.0"

src/brainz.rs

@@ -1,12 +1,12 @@
-use percent_encoding::{utf8_percent_encode, DEFAULT_ENCODE_SET};
 use failure::Error;
+use percent_encoding::{utf8_percent_encode, DEFAULT_ENCODE_SET};
+use regex::Regex;
 use std::io::Read;
 use std::time::Duration;
-use regex::Regex;
 
 #[derive(Serialize, Deserialize, Debug)]
 struct MBArtistQueryResult {
-    created : String,
+    created: String,
     count: i32,
     offset: i32,
     artists: Option<Vec<MBArtist>>,
@@ -23,22 +23,31 @@ struct MBArtist {
     id: String,
     score: i32,
     name: String,
-    #[serde(rename="sort-name")]
+    #[serde(rename = "sort-name")]
     sort_name: String,
-    tags: Option<Vec<Tag>>
+    tags: Option<Vec<Tag>>,
 }
 
 const VERSION: &'static str = env!("CARGO_PKG_VERSION");
 
-pub fn check_artist(config : &crate::Config, artist : &str) -> Result<bool, Error> {
+pub fn check_artist(config: &crate::Config, artist: &str) -> Result<bool, Error> {
     let query = utf8_percent_encode(&format!("\"{}\"", artist), DEFAULT_ENCODE_SET).to_string();
-    let url = format!("https://musicbrainz.org/ws/2/artist?query={}&fmt=json&inc=tags", query);
+    let url = format!(
+        "https://musicbrainz.org/ws/2/artist?query={}&fmt=json&inc=tags",
+        query
+    );
 
-    info!("Querying MusicBrainz for artist \"{}\", query URL: {}", artist, url);
+    info!(
+        "Querying MusicBrainz for artist \"{}\", query URL: {}",
+        artist, url
+    );
 
     let mut resp = String::new();
 
-    let ua = format!("Bad Song Skipper / {v} ( https://git.ondrovo.com/MightyPork/rapblock )", v=VERSION);
+    let ua = format!(
+        "Bad Song Skipper / {v} ( https://git.ondrovo.com/MightyPork/rapblock )",
+        v = VERSION
+    );
 
     debug!("Using UA: {}", ua);
 
@@ -53,7 +62,7 @@ pub fn check_artist(config : &crate::Config, artist : &str) -> Result<bool, Erro
 
     debug!("Resp: {}", resp);
 
-    let result : MBArtistQueryResult = serde_json::from_str(&resp)?;
+    let result: MBArtistQueryResult = serde_json::from_str(&resp)?;
 
     info!("Response OK");
     debug!("{:#?}", result);
@@ -63,7 +72,10 @@ pub fn check_artist(config : &crate::Config, artist : &str) -> Result<bool, Erro
         warn!("No results!");
         return Err(failure::err_msg("Artist not found"));
     } else {
-        info!("Got {} results, checking where score >= {}", result.count, config.artist_min_score);
+        info!(
+            "Got {} results, checking where score >= {}",
+            result.count, config.artist_min_score
+        );
         let artists = result.artists.as_ref().unwrap();
 
         let mut confidence = false;
@@ -75,7 +87,7 @@ pub fn check_artist(config : &crate::Config, artist : &str) -> Result<bool, Erro
                     let tags = a.tags.as_ref().unwrap();
                     let as_vec: Vec<&String> = tags.iter().map(|t| &t.name).collect();
 
-                    info!("Artist #{} - \"{}\" has tags: {:?}", an+1, a.name, as_vec);
+                    info!("Artist #{} - \"{}\" has tags: {:?}", an + 1, a.name, as_vec);
                     'tags: for tag in as_vec {
                         if config.whitelist.tag.contains(tag) {
                             info!("+ Whitelisted tag \"{}\"", tag);
@@ -87,17 +99,19 @@ pub fn check_artist(config : &crate::Config, artist : &str) -> Result<bool, Erro
                             info!("- Blacklisted tag \"{}\"", tag);
                             blacklisted = true;
                         } else {
-                            'blacklist:
+                            'blacklist: for t in config.blacklist.tag_partial.iter() {
-                            for t in config.blacklist.tag_partial.iter() {
                                 let re = Regex::new(&format!(r"\b{}\b", regex::escape(t)));
 
                                 let matches = match re {
                                     Ok(re) => re.is_match(tag),
-                                    Err(_) => tag.contains(t)
+                                    Err(_) => tag.contains(t),
                                 };
 
                                 if matches {
-                                    info!("- Blacklisted tag \"{}\" - due to substring \"{}\"", tag, t);
+                                    info!(
+                                        "- Blacklisted tag \"{}\" - due to substring \"{}\"",
+                                        tag, t
+                                    );
                                     blacklisted = true;
                                     break 'blacklist;
                                 }
@@ -113,7 +127,11 @@ pub fn check_artist(config : &crate::Config, artist : &str) -> Result<bool, Erro
                     info!("All tags OK");
                     confidence = true;
                 } else {
-                    warn!("Artist #{} - \"{}\" has no tags, can't determine genre", an+1, a.name);
+                    warn!(
+                        "Artist #{} - \"{}\" has no tags, can't determine genre",
+                        an + 1,
+                        a.name
+                    );
                 }
             }
         }

src/config_file.rs

@@ -0,0 +1,150 @@
+use failure::Error;
+use inotify::{Inotify, WatchMask, EventMask};
+use serde::de::DeserializeOwned;
+use std::fs::File;
+use std::io::BufReader;
+use std::path::Path;
+use std::path::PathBuf;
+
+/// Reloadable config file
+pub struct ConfigFile<T> {
+    is_dummy : bool,
+    config: T,
+    path: PathBuf,
+    inotify: Option<Inotify>,
+    inotify_buffer: [u8; 1024],
+}
+
+impl<T> ConfigFile<T>
+where
+    T: Default + std::fmt::Debug + DeserializeOwned,
+{
+    pub fn borrow(&self) -> &T {
+        &self.config
+    }
+
+    /// Create a new reloadable config file
+    /// If loading fails, an error is printed and default values are be used
+    pub fn new<P: AsRef<Path>>(path: P) -> Result<Self, Error> {
+        let loaded = Self::load(&path);
+        if let Err(e) = &loaded {
+            eprintln!("Config file failed to load/parse: {}", e);
+        }
+
+        Ok(Self {
+            is_dummy: false,
+            config: loaded.unwrap_or(T::default()),
+            path: path.as_ref().to_owned(),
+            inotify: Self::setup_inotify(&path),
+            inotify_buffer: [0; 1024],
+        })
+    }
+
+    /// New without a backing file
+    #[allow(dead_code)]
+    pub fn new_from_defaults() -> Self {
+        Self {
+            is_dummy: true,
+            config: T::default(),
+            path: "".into(),
+            inotify: None,
+            inotify_buffer: [0; 1024]
+        }
+    }
+
+    /// Try to install inotify
+    fn setup_inotify<P: AsRef<Path>>(path: P) -> Option<Inotify> {
+        let inotify = Inotify::init();
+        if let Err(e) = inotify {
+            eprintln!("Failed to set up inotify for config file reload!\n{}", e);
+            return None;
+        }
+
+        let mut inotify = inotify.unwrap();
+        let rv = inotify.add_watch(&path, WatchMask::MODIFY | WatchMask::CLOSE);
+
+        match rv {
+            Err(e) => {
+                eprintln!("Failed to add inotify watch for config!\n{}", e);
+                None
+            }
+            Ok(_) => Some(inotify),
+        }
+    }
+
+    /// Update the config file if needed (there are inotify events)
+    /// - if inotify failed to init, or an error occurs trying to get events from it,
+    ///   the 'def' value is used (true = reload if unsure)
+    pub fn update_if_needed(&mut self, def: bool) -> Result<bool, Error> {
+        if self.is_dummy {
+            debug!("Config is dummy, no path to reload.");
+            return Ok(false);
+        }
+
+        let needed = match self.inotify.as_mut() {
+            Some(ino) => {
+                let rv = ino.read_events(&mut self.inotify_buffer);
+                match rv {
+                    Ok(evs) => {
+                        let mut changed = false;
+                        let mut need_reinstall = false;
+                        for ev in evs {
+                            if ev.mask.contains(EventMask::IGNORED) {
+                                debug!("Inotify watcher got removed by OS??");
+                                changed = true;
+                                need_reinstall = true;
+                            }
+                            if ev.mask.contains(EventMask::MODIFY) {
+                                changed = true;
+                            }
+                        }
+                        if changed {
+                            info!("Config file changes detected, reloading");
+                        }
+                        if need_reinstall {
+                            debug!("Reinstalling inotify");
+                            self.inotify = Self::setup_inotify(&self.path);
+                        }
+                        changed
+                    }
+                    _ => {
+                        error!("Failed to get inotify events.");
+                        def
+                    }
+                }
+            }
+            None => def,
+        };
+
+        if needed {
+            self.update()?;
+        } else {
+            debug!("Config update not needed.");
+        }
+
+        Ok(needed)
+    }
+
+    /// load and parse the config file
+    fn load<P: AsRef<Path>>(path: P) -> Result<T, Error> {
+        info!("Loading config file @ {}", path.as_ref().to_str().unwrap_or("???"));
+        let file = File::open(&path)?;
+        let reader = BufReader::new(file);
+        let val : T = serde_json::from_reader(reader)?;
+
+        debug!("Loaded config:\n{:#?}", val);
+
+        Ok(val)
+    }
+
+    /// Reload unconditionally
+    pub fn update(&mut self) -> Result<(), Error> {
+        if self.is_dummy {
+            debug!("Config is dummy, no path to reload.");
+            return Ok(());
+        }
+
+        self.config = Self::load(&self.path)?;
+        Ok(())
+    }
+}

src/main.rs

@@ -1,19 +1,19 @@
 #[macro_use] extern crate serde_derive;
 //#[macro_use] extern crate lazy_static;
 #[macro_use] extern crate log;
-#[macro_use] extern crate failure;
+//#[macro_use] extern crate failure;
+
+use std::env;
+use crate::config_file::ConfigFile;
+use std::collections::HashMap;
+use mpris::PlayerFinder;
+use std::time::Duration;
+use mpris::Event;
+use std::collections::HashSet;
+use failure::Error;
 
 mod brainz;
-
+mod config_file;
-use mpris::{PlayerFinder,Event};
-use failure::Error;
-use std::time::Duration;
-use std::collections::HashSet;
-use std::env;
-use std::path::Path;
-use std::fs::File;
-use std::io::Read;
-use std::collections::HashMap;
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(default)]
@@ -35,7 +35,7 @@ impl Default for BlacklistConf {
                 "hip-hop".to_owned(),
                 "hip hop".to_owned(),
                 "hiphop".to_owned(),
-                "rap".to_owned()
+                "rap".to_owned(),
             ],
         }
     }
@@ -54,7 +54,7 @@ impl Default for WhiteList {
     fn default() -> Self {
         Self {
             tag: vec![],
-            artist: vec![]
+            artist: vec![],
         }
     }
 }
@@ -71,9 +71,9 @@ pub struct Config {
     /// Whitelist (overrides blacklist)
     pub whitelist: WhiteList,
     /// Min MusicBrainz search score for artist look-up
-    pub artist_min_score : i32,
+    pub artist_min_score: i32,
     /// Max nr of artists to check per track
-    pub max_artists_per_track : u64,
+    pub max_artists_per_track: u64,
     /// Interval in which the daemon probes DBUS for open MPRIS channels
     pub player_find_interval_ms: u64,
     /// Delay after a skip or allow, e.g. to prevent infinite skip chain when someone starts a rap playlist
@@ -96,71 +96,55 @@ impl Default for Config {
             player_find_interval_ms: 2500,
             cooldown_ms: 1000,
             api_timeout_ms: 2000,
-            allow_by_default: true
+            allow_by_default: true,
         }
     }
 }
 
 const CONFIG_FILE: &'static str = "rapblock.json";
 
-fn load_config() -> Result<Config, Error> {
-    let config_file_path = env::current_dir()?.join(CONFIG_FILE);
-    let buf = read_file(config_file_path)?;
-
-    let config : Config = serde_json::from_str(&buf)?;
-
-    // Validations
-    match config.logging.as_ref() {
-        "info" | "debug" | "trace" | "warning" | "error" => (),
-        _ => bail!("Invalid value for \"logging\""),
-    };
-
-    Ok(config)
-}
-
-pub fn read_file<P: AsRef<Path>>(path: P) -> Result<String, Error> {
-    let path = path.as_ref();
-    let mut file = File::open(path)?;
-
-    let mut buf = String::new();
-    file.read_to_string(&mut buf)?;
-    Ok(buf)
-}
-
 fn main() -> Result<(), Error> {
-    let config = match load_config() {
+    //    let config = match load_config() {
-        Ok(c) => c,
+    //        Ok(c) => c,
-        Err(e) => {
+    //        Err(e) => {
-            eprintln!("Could not load config from \"{}\": {}", CONFIG_FILE, e);
+    //            eprintln!("Could not load config from \"{}\": {}", CONFIG_FILE, e);
-            Config::default()
+    //            Config::default()
-        }
+    //        }
-    };
+    //    };
 
-    let env = env_logger::Env::default().default_filter_or(&config.logging);
+    let config_file_path = env::current_dir()?.join(CONFIG_FILE);
+    let mut cfg: ConfigFile<Config> = config_file::ConfigFile::new(config_file_path)?;
+
+    let env = env_logger::Env::default().default_filter_or(&cfg.borrow().logging);
     env_logger::Builder::from_env(env).init();
 
-    debug!("Loaded config:\n{}", serde_json::to_string_pretty(&config)?);
-
     let mut artist_cache = HashMap::<String, bool>::new();
 
     info!("Waiting for players...");
 
-    'main_loop:
+    'main_loop: loop {
-    loop {
         // XXX this picks the first player, which isn't always ideal - see mpris/src/find.rs
         let player = PlayerFinder::new()
             .expect("Could not connect to D-Bus")
             .find_active();
 
+        let _ = cfg.update_if_needed(false);
+
         if let Ok(player) = player {
+            let config = cfg.borrow();
             let player_name = player.bus_name().to_string();
-            if !config.allowed_players.is_empty() && !config.allowed_players.contains(&player_name) {
+            if !config.allowed_players.is_empty() && !config.allowed_players.contains(&player_name)
+            {
                 debug!("Ignoring player {}", player_name);
                 ::std::thread::sleep(Duration::from_millis(config.player_find_interval_ms));
                 continue 'main_loop;
             }
 
-            info!("Connected to player: {}{}", player_name, player.unique_name());
+            info!(
+                "Connected to player: {}{}",
+                player_name,
+                player.unique_name()
+            );
 
             let events = player.events();
             if events.is_err() {
@@ -170,8 +154,10 @@ fn main() -> Result<(), Error> {
                 continue 'main_loop;
             }
 
-            'event_loop:
+            'event_loop: for event in events.unwrap() {
-            for event in events.unwrap() {
+                let _ = cfg.update_if_needed(false);
+                let config = cfg.borrow();
+
                 match event {
                     Ok(event) => {
                         debug!("MPRIS event: {:#?}", event);
@@ -179,7 +165,7 @@ fn main() -> Result<(), Error> {
                             Event::PlayerShutDown => {
                                 info!("Player shut down");
                                 break 'event_loop;
-                            },
+                            }
                             Event::TrackChanged(metadata) => {
                                 let title = metadata.title().unwrap_or("");
                                 info!("--- new track : {} ---", title);
@@ -194,17 +180,24 @@ fn main() -> Result<(), Error> {
                                 let mut artists = HashSet::new();
 
                                 if let Some(aa) = metadata.artists() {
-                                    for a in aa { artists.insert(a); }
+                                    for a in aa {
+                                        artists.insert(a);
+                                    }
                                 }
                                 if let Some(aa) = metadata.album_artists() {
-                                    for a in aa { artists.insert(a); }
+                                    for a in aa {
+                                        artists.insert(a);
+                                    }
                                 }
 
                                 let mut skip = false;
                                 let mut confidence = false;
-                                'artists_loop:
+                                'artists_loop: for (an, a) in artists
-                                for (an, a) in artists.iter().take(config.max_artists_per_track as usize).enumerate() {
+                                    .iter()
-                                    info!("Checking artist #{}: {}", an+1, a);
+                                    .take(config.max_artists_per_track as usize)
+                                    .enumerate()
+                                {
+                                    info!("Checking artist #{}: {}", an + 1, a);
                                     if let Some(resolution) = artist_cache.get(a.as_str()) {
                                         confidence = true;
                                         if !resolution {
@@ -243,11 +236,12 @@ fn main() -> Result<(), Error> {
                                                 skip = true;
                                                 break 'artists_loop;
                                             }
-                                        },
+                                        }
                                         Err(e) => {
                                             warn!("Something went wrong: {}", e);
                                             // probably no tags, or not found - use the default action
-                                            artist_cache.insert(a.to_string(), config.allow_by_default);
+                                            artist_cache
+                                                .insert(a.to_string(), config.allow_by_default);
                                         }
                                     }
                                 }
@@ -262,12 +256,12 @@ fn main() -> Result<(), Error> {
                                 }
 
                                 ::std::thread::sleep(Duration::from_millis(config.cooldown_ms));
-                            },
+                            }
                             _ => {
                                 debug!("Event not handled.");
                             }
                         }
-                    },
+                    }
                     Err(err) => {
                         error!("D-Bus error: {}. Aborting.", err);
                         break 'event_loop;
@@ -279,8 +273,6 @@ fn main() -> Result<(), Error> {
             debug!("No player found, waiting...");
         }
 
-        ::std::thread::sleep(Duration::from_millis(config.player_find_interval_ms));
+        ::std::thread::sleep(Duration::from_millis(cfg.borrow().player_find_interval_ms));
     }
 }
-
-