add dumb logging

Cargo.toml

@@ -16,8 +16,12 @@ cli = [
     "figment/yaml",
     "figment/json",
     "figment/toml",
-    "figment/env"
+    "figment/env",
+    "logforth",
+    "dep:fastrace"
 ]
+enable-tracing = ["fastrace/enable"]
+logforth = ["dep:logforth", "dep:opentelemetry-otlp"]
 tokio = ["dep:tokio"]
 # Very long running.
 get_time_test = []
@@ -63,3 +67,8 @@ eyre = { version = "0.6.12" }
 num_cpus = { version = "1.17.0", optional = true }
 either = "1.15.0"
 humantime = "2.3.0"
+
+log = { version = "0.4.28", features = ["kv", "kv_serde", "std", "serde"] }
+logforth = { version = "0.28.1", default-features = false, features = ["append-fastrace", "append-file", "bridge-log", "layout-text", "layout-json", "append-async", "append-opentelemetry", "diagnostic-fastrace", "rustls"], optional = true }
+opentelemetry-otlp = { version = "0.31.0", default-features = false, features = ["logs", "metrics", "http-proto", "http-json"], optional = true }
+fastrace = { version = "0.7.14", optional = true }

src/cli/mod.rs

@@ -149,6 +149,8 @@ impl App {
         }
 
         let component_configs = ComponentConfigs::new(map);
+        crate::logging::logforth::setup(component_configs.get());
+
         let rt_config = component_configs.get::<rt::RtConfig>();
 
         let rt = match rt_config.flavor {
@@ -184,5 +186,6 @@ impl Default for App {
         };
 
         this.optional::<rt::RtConfig>("system.rt")
+            .optional::<crate::logging::logforth::Config>("system.logging")
     }
 }

src/component_configs.rs

@@ -1,8 +1,8 @@
 use crate::{collections::HashMap, str::CompactString, trait_set};
 
 use std::{
-    mem,
     any::{Any, TypeId},
+    fmt, mem,
     ops::Deref,
     sync::{
         Arc, Mutex,
@@ -91,11 +91,21 @@ pub struct ComponentConfig<T> {
     handle: Arc<ConfigHandle>,
 }
 
+impl<T: fmt::Debug> fmt::Debug for ComponentConfig<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        <T as fmt::Debug>::fmt(&**self, f)
+    }
+}
+
 impl<T: IsComponentConfig> ComponentConfig<T> {
     pub fn section(&self) -> &str {
         &self.handle.section
     }
 
+    pub fn outdated(&self) -> bool {
+        self.generation != self.handle.generation.load(Ordering::Relaxed)
+    }
+
     /// Update component config. Returns previous config if something's changed.
     pub fn try_update(&mut self) -> Option<T> {
         let generation = self.handle.generation.load(Ordering::Relaxed);

src/lib.rs

@@ -28,6 +28,8 @@ pub use trait_set::trait_set;
 #[cfg(feature = "cli")]
 pub mod cli;
 
+pub mod logging;
+
 pub mod array;
 pub mod error;
 pub mod utils;

src/logging/logforth.rs

@@ -0,0 +1,137 @@
+use std::{collections::HashMap, fmt, path::PathBuf};
+
+use logforth::{
+    Filter,
+    filter::FilterResult,
+    layout::JsonLayout,
+    record::{LevelFilter, Metadata},
+};
+
+use opentelemetry_otlp::WithExportConfig as _;
+
+use crate::{component_configs::ComponentConfig, data};
+
+#[data(crate = crate, copy)]
+#[derive(Default)]
+pub enum LogLevel {
+    Debug,
+    Warn,
+    Error,
+    #[default]
+    Info,
+    Trace,
+}
+
+impl From<LogLevel> for log::Level {
+    fn from(value: LogLevel) -> Self {
+        use LogLevel::*;
+        use log::Level as D;
+
+        match value {
+            Info => D::Info,
+            Warn => D::Warn,
+            Trace => D::Trace,
+            Error => D::Error,
+            Debug => D::Debug,
+        }
+    }
+}
+
+#[data(crate = crate)]
+pub enum Append {
+    File {
+        base_dir: PathBuf,
+        file_name: String,
+    },
+    Otel {
+        name: String,
+        endpoint: String,
+        #[serde(default)]
+        labels: HashMap<String, String>,
+    },
+    Stderr,
+    Stdout,
+}
+
+impl Append {
+    pub fn to_appender(&self) -> Box<dyn logforth::Append> {
+        use logforth::append;
+
+        match self {
+            Self::File {
+                base_dir,
+                file_name,
+            } => Box::new(
+                append::file::FileBuilder::new(base_dir.clone(), file_name.clone())
+                    .filename_suffix("log")
+                    .layout(JsonLayout::default())
+                    .build()
+                    .unwrap(),
+            ),
+            Self::Otel {
+                name,
+                endpoint,
+                labels,
+            } => {
+                let log_exporter = opentelemetry_otlp::LogExporter::builder()
+                    .with_http()
+                    .with_endpoint(endpoint.as_str())
+                    .build()
+                    .unwrap();
+                Box::new(
+                    append::opentelemetry::OpentelemetryLogBuilder::new(name.clone(), log_exporter)
+                        .labels(labels.iter().map(|(k, v)| (k.clone(), v.clone())))
+                        .build(),
+                )
+            }
+            Self::Stderr => Box::new(append::Stderr::default()),
+            Self::Stdout => Box::new(append::Stdout::default()),
+        }
+    }
+}
+
+#[data(crate = crate)]
+pub struct Config {
+    #[serde(default)]
+    pub default_level: LogLevel,
+    #[serde(default)]
+    pub levels: HashMap<String, LogLevel>,
+    #[serde(default = "Config::default_append")]
+    pub append: Vec<Append>,
+}
+
+impl Config {
+    fn default_append() -> Vec<Append> {
+        vec![Append::Stderr]
+    }
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            default_level: LogLevel::default(),
+            levels: HashMap::default(),
+            append: Self::default_append(),
+        }
+    }
+}
+
+pub fn setup(cfg: ComponentConfig<Config>) {
+    use logforth::{
+        append::{self, asynchronous as async_},
+        diagnostic,
+    };
+
+    logforth::starter_log::builder()
+        .dispatch(move |d| {
+            let mut appenders = async_::AsyncBuilder::new("system.logger");
+            for appender in cfg.append.iter() {
+                appenders = appenders.append(appender.to_appender());
+            }
+
+            d.diagnostic(diagnostic::FastraceDiagnostic::default())
+                .append(append::FastraceEvent::default())
+                .append(appenders.build())
+        })
+        .apply();
+}

src/logging/mod.rs

@@ -0,0 +1,4 @@
+pub use log::{debug, error, info, log, log_enabled, trace, warn};
+
+#[cfg(feature = "logforth")]
+pub mod logforth;

src/supervisor/mod.rs

@@ -1,5 +1,6 @@
 use compact_str::ToCompactString;
 use eyre::eyre;
+use fastrace::{Span, future::FutureExt, prelude::SpanContext};
 use tokio::{sync::mpsc, task::JoinSet};
 
 use crate::{
@@ -82,6 +83,7 @@ where
 }
 
 pub struct Supervisor {
+    span: Span,
     set: JoinSet<eyre::Result<()>>,
     handles: HashMap<CompactString, Handle>,
     configs: ComponentConfigs,
@@ -90,6 +92,7 @@ pub struct Supervisor {
 impl Supervisor {
     pub fn new(configs: ComponentConfigs) -> Self {
         Self {
+            span: Span::root("supervisor", SpanContext::random()),
             set: JoinSet::new(),
             handles: HashMap::default(),
             configs,
@@ -108,35 +111,38 @@ impl Supervisor {
         let config = self.configs.get::<T>();
         let name = config.section().to_compact_string();
 
-        self.set.spawn(async move {
-            let fut = f(config, slave_rx);
-            tokio::pin!(fut);
-            loop {
-                tokio::select! {
-                    res = &mut fut => {
-                        break res;
-                    }
+        self.set.spawn(
+            async move {
+                let fut = f(config, slave_rx);
+                tokio::pin!(fut);
+                loop {
+                    tokio::select! {
+                        res = &mut fut => {
+                            break res;
+                        }
 
-                    cmd = rx.recv(), if !rx.is_closed() => {
-                        let Some(cmd) = cmd else {
-                            continue;
-                        };
+                        cmd = rx.recv(), if !rx.is_closed() => {
+                            let Some(cmd) = cmd else {
+                                continue;
+                            };
 
-                        match cmd {
-                            SupervisorCommand::Ping { pong } => {
-                                pong.wake();
-                            }
+                            match cmd {
+                                SupervisorCommand::Ping { pong } => {
+                                    pong.wake();
+                                }
 
-                            SupervisorCommand::User(u) => {
-                                if stx.send(u).await.is_err() {
-                                    rx.close();
+                                SupervisorCommand::User(u) => {
+                                    if stx.send(u).await.is_err() {
+                                        rx.close();
+                                    }
                                 }
                             }
                         }
                     }
                 }
             }
-        });
+            .in_span(Span::enter_with_parent(name.clone(), &self.span)),
+        );
 
         let hash_map::Entry::Vacant(vac) = self.handles.entry(name.clone()) else {
             panic!("{name:?} already exists")
@@ -169,6 +175,8 @@ impl Supervisor {
             }
         }
 
+        fastrace::flush();
+
         Ok(())
     }
 }