Add tracing layer list and refactor logging implementation

Signed-off-by: trivernis <trivernis@protonmail.com>

mediarepo-daemon/Cargo.lock

@@ -1311,6 +1311,7 @@ dependencies = [
  "tokio-graceful-shutdown",
  "toml",
  "tracing",
+ "tracing-subscriber",
  "typemap_rev",
 ]
 

mediarepo-daemon/mediarepo-core/Cargo.toml

@@ -21,6 +21,7 @@ tracing = "0.1.31"
 data-encoding = "2.3.2"
 tokio-graceful-shutdown = "0.4.3"
 thumbnailer = "0.4.0"
+tracing-subscriber = "0.3.9"
 
 [dependencies.sea-orm]
 version = "0.6.0"

mediarepo-daemon/mediarepo-core/src/lib.rs

@@ -10,5 +10,6 @@ pub mod context;
 pub mod error;
 pub mod fs;
 pub mod settings;
+pub mod tracing_layer_list;
 pub mod type_keys;
 pub mod utils;

mediarepo-daemon/mediarepo-core/src/tracing_layer_list.rs

@@ -0,0 +1,118 @@
+use std::slice::{Iter, IterMut};
+use tracing::level_filters::LevelFilter;
+use tracing::span::{Attributes, Record};
+use tracing::subscriber::Interest;
+use tracing::{Event, Id, Metadata, Subscriber};
+use tracing_subscriber::Layer;
+
+pub struct DynLayerList<S>(Vec<Box<dyn Layer<S> + Send + Sync + 'static>>);
+
+impl<S> DynLayerList<S> {
+    pub fn new() -> Self {
+        Self(Vec::new())
+    }
+
+    pub fn iter(&self) -> Iter<'_, Box<dyn Layer<S> + Send + Sync>> {
+        self.0.iter()
+    }
+
+    pub fn iter_mut(&mut self) -> IterMut<'_, Box<dyn Layer<S> + Send + Sync>> {
+        self.0.iter_mut()
+    }
+}
+
+impl<S> DynLayerList<S>
+where
+    S: Subscriber,
+{
+    pub fn add<L: Layer<S> + Send + Sync>(&mut self, layer: L) {
+        self.0.push(Box::new(layer));
+    }
+}
+
+impl<S> Layer<S> for DynLayerList<S>
+where
+    S: Subscriber,
+{
+    fn on_layer(&mut self, subscriber: &mut S) {
+        self.iter_mut().for_each(|l| l.on_layer(subscriber));
+    }
+
+    fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest {
+        // Return highest level of interest.
+        let mut interest = Interest::never();
+        for layer in &self.0 {
+            let new_interest = layer.register_callsite(metadata);
+            if (interest.is_sometimes() && new_interest.is_always())
+                || (interest.is_never() && !new_interest.is_never())
+            {
+                interest = new_interest;
+            }
+        }
+        interest
+    }
+
+    fn enabled(
+        &self,
+        metadata: &Metadata<'_>,
+        ctx: tracing_subscriber::layer::Context<'_, S>,
+    ) -> bool {
+        self.iter().any(|l| l.enabled(metadata, ctx.clone()))
+    }
+
+    fn on_new_span(
+        &self,
+        attrs: &Attributes<'_>,
+        id: &Id,
+        ctx: tracing_subscriber::layer::Context<'_, S>,
+    ) {
+        self.iter()
+            .for_each(|l| l.on_new_span(attrs, id, ctx.clone()));
+    }
+
+    fn max_level_hint(&self) -> Option<LevelFilter> {
+        self.iter().filter_map(|l| l.max_level_hint()).max()
+    }
+
+    fn on_record(
+        &self,
+        span: &Id,
+        values: &Record<'_>,
+        ctx: tracing_subscriber::layer::Context<'_, S>,
+    ) {
+        self.iter()
+            .for_each(|l| l.on_record(span, values, ctx.clone()));
+    }
+
+    fn on_follows_from(
+        &self,
+        span: &Id,
+        follows: &Id,
+        ctx: tracing_subscriber::layer::Context<'_, S>,
+    ) {
+        self.iter()
+            .for_each(|l| l.on_follows_from(span, follows, ctx.clone()));
+    }
+
+    fn on_event(&self, event: &Event<'_>, ctx: tracing_subscriber::layer::Context<'_, S>) {
+        self.iter().for_each(|l| l.on_event(event, ctx.clone()));
+    }
+
+    fn on_enter(&self, id: &Id, ctx: tracing_subscriber::layer::Context<'_, S>) {
+        self.iter().for_each(|l| l.on_enter(id, ctx.clone()));
+    }
+
+    fn on_exit(&self, id: &Id, ctx: tracing_subscriber::layer::Context<'_, S>) {
+        self.iter().for_each(|l| l.on_exit(id, ctx.clone()));
+    }
+
+    fn on_close(&self, id: Id, ctx: tracing_subscriber::layer::Context<'_, S>) {
+        self.iter()
+            .for_each(|l| l.on_close(id.clone(), ctx.clone()));
+    }
+
+    fn on_id_change(&self, old: &Id, new: &Id, ctx: tracing_subscriber::layer::Context<'_, S>) {
+        self.iter()
+            .for_each(|l| l.on_id_change(old, new, ctx.clone()));
+    }
+}

mediarepo-daemon/src/logging.rs

@@ -7,16 +7,17 @@ use tracing::Level;
 use tracing_appender::non_blocking::{NonBlocking, WorkerGuard};
 use tracing_flame::FlameLayer;
 use tracing_log::LogTracer;
-use tracing_subscriber::{
-    fmt::{self},
-    Layer, Registry,
-};
 use tracing_subscriber::filter::{self, Targets};
 use tracing_subscriber::fmt::format::FmtSpan;
 use tracing_subscriber::layer::SubscriberExt;
 use tracing_subscriber::util::SubscriberInitExt;
+use tracing_subscriber::{
+    fmt::{self},
+    Layer, Registry,
+};
 
 use mediarepo_core::settings::LoggingSettings;
+use mediarepo_core::tracing_layer_list::DynLayerList;
 
 #[allow(dyn_drop)]
 pub type DropGuard = Box<dyn Drop>;
@@ -25,39 +26,60 @@ pub fn init_tracing(repo_path: &PathBuf, log_cfg: &LoggingSettings) -> Vec<DropG
     LogTracer::init().expect("failed to subscribe to log entries");
     let log_path = repo_path.join("logs");
     let mut guards = Vec::new();
+    let mut layer_list = DynLayerList::new();
 
     if !log_path.exists() {
         fs::create_dir(&log_path).expect("failed to create directory for log files");
     }
-    let (stdout_writer, guard) = tracing_appender::non_blocking(std::io::stdout());
-    guards.push(Box::new(guard) as DropGuard);
 
-    let stdout_layer = fmt::layer()
-        .with_thread_names(false)
-        .with_target(true)
-        .with_writer(stdout_writer)
-        .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
-        .with_filter(
-            std::env::var("RUST_LOG")
-                .unwrap_or(String::from("info,sqlx=warn"))
-                .parse::<filter::Targets>()
-                .unwrap_or(
-                    filter::Targets::new()
-                        .with_default(Level::INFO)
-                        .with_target("sqlx", Level::WARN),
-                ),
-        );
+    add_stdout_layer(&mut guards, &mut layer_list);
+    add_sql_layer(log_cfg, &log_path, &mut guards, &mut layer_list);
+    add_bromine_layer(log_cfg, &log_path, &mut guards, &mut layer_list);
+    add_app_log_layer(log_cfg, &log_path, &mut guards, &mut layer_list);
 
-    let (sql_writer, guard) = get_sql_log_writer(&log_path);
+    let tokio_console_enabled = std::env::var("TOKIO_CONSOLE")
+        .map(|v| v.eq_ignore_ascii_case("true"))
+        .unwrap_or(false);
+
+    if tokio_console_enabled {
+        add_tokio_console_layer(&mut layer_list);
+    }
+
+    let registry = Registry::default().with(layer_list);
+    tracing::subscriber::set_global_default(registry).expect("Failed to initialize tracing");
+
+    guards
+}
+
+fn add_tokio_console_layer(layer_list: &mut DynLayerList<Registry>) {
+    let console_layer = ConsoleLayer::builder().with_default_env().spawn();
+    layer_list.add(console_layer);
+}
+
+fn add_app_log_layer(
+    log_cfg: &LoggingSettings,
+    log_path: &PathBuf,
+    guards: &mut Vec<DropGuard>,
+    layer_list: &mut DynLayerList<Registry>,
+) {
+    let (app_log_writer, guard) = get_application_log_writer(&log_path);
     guards.push(Box::new(guard) as DropGuard);
 
-    let sql_layer = fmt::layer()
-        .with_writer(sql_writer)
+    let app_log_layer = fmt::layer()
+        .with_writer(app_log_writer)
         .pretty()
         .with_ansi(false)
-        .with_span_events(FmtSpan::NONE)
-        .with_filter(get_sql_targets(log_cfg.trace_sql));
+        .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
+        .with_filter(get_app_targets(log_cfg.level.clone().into()));
+    layer_list.add(app_log_layer);
+}
 
+fn add_bromine_layer(
+    log_cfg: &LoggingSettings,
+    log_path: &PathBuf,
+    guards: &mut Vec<DropGuard>,
+    layer_list: &mut DynLayerList<Registry>,
+) {
     let (bromine_writer, guard) = get_bromine_log_writer(&log_path);
     guards.push(Box::new(guard) as DropGuard);
 
@@ -67,36 +89,48 @@ pub fn init_tracing(repo_path: &PathBuf, log_cfg: &LoggingSettings) -> Vec<DropG
         .with_ansi(false)
         .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
         .with_filter(get_bromine_targets(log_cfg.trace_api_calls));
+    layer_list.add(bromine_layer);
+}
 
-    let (app_log_writer, guard) = get_application_log_writer(&log_path);
+fn add_sql_layer(
+    log_cfg: &LoggingSettings,
+    log_path: &PathBuf,
+    guards: &mut Vec<DropGuard>,
+    layer_list: &mut DynLayerList<Registry>,
+) {
+    let (sql_writer, guard) = get_sql_log_writer(&log_path);
     guards.push(Box::new(guard) as DropGuard);
 
-    let app_log_layer = fmt::layer()
-        .with_writer(app_log_writer)
+    let sql_layer = fmt::layer()
+        .with_writer(sql_writer)
         .pretty()
         .with_ansi(false)
-        .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
-        .with_filter(get_app_targets(log_cfg.level.clone().into()));
-
-    let registry = Registry::default()
-        .with(stdout_layer)
-        .with(sql_layer)
-        .with(bromine_layer)
-        .with(app_log_layer);
-
-    let tokio_console_enabled = std::env::var("TOKIO_CONSOLE")
-        .map(|v| v.eq_ignore_ascii_case("true"))
-        .unwrap_or(false);
+        .with_span_events(FmtSpan::NONE)
+        .with_filter(get_sql_targets(log_cfg.trace_sql));
 
-    if tokio_console_enabled {
-        let console_layer = ConsoleLayer::builder().with_default_env().spawn();
-        let registry = registry.with(console_layer);
-        tracing::subscriber::set_global_default(registry).expect("Failed to initialize tracing");
-    } else {
-        tracing::subscriber::set_global_default(registry).expect("Failed to initialize tracing");
+    layer_list.add(sql_layer);
 }
 
-    guards
+fn add_stdout_layer(guards: &mut Vec<DropGuard>, layer_list: &mut DynLayerList<Registry>) {
+    let (stdout_writer, guard) = tracing_appender::non_blocking(std::io::stdout());
+    guards.push(Box::new(guard) as DropGuard);
+
+    let stdout_layer = fmt::layer()
+        .with_thread_names(false)
+        .with_target(true)
+        .with_writer(stdout_writer)
+        .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
+        .with_filter(
+            std::env::var("RUST_LOG")
+                .unwrap_or(String::from("info,sqlx=warn"))
+                .parse::<filter::Targets>()
+                .unwrap_or(
+                    filter::Targets::new()
+                        .with_default(Level::INFO)
+                        .with_target("sqlx", Level::WARN),
+                ),
+        );
+    layer_list.add(stdout_layer);
 }
 
 fn get_sql_log_writer(log_path: &PathBuf) -> (NonBlocking, WorkerGuard) {