Allow dynamic selection of log format.

contrib/dyn_templates/src/template.rs

@@ -7,7 +7,7 @@ use rocket::fairing::Fairing;
 use rocket::response::{self, Responder};
 use rocket::http::{ContentType, Status};
 use rocket::figment::{value::Value, error::Error};
-use rocket::trace::Traceable;
+use rocket::trace::Trace;
 use rocket::serde::Serialize;
 
 use crate::Engines;

contrib/sync_db_pools/lib/src/connection.rs

@@ -6,7 +6,7 @@ use rocket::fairing::{AdHoc, Fairing};
 use rocket::request::{Request, Outcome, FromRequest};
 use rocket::outcome::IntoOutcome;
 use rocket::http::Status;
-use rocket::trace::Traceable;
+use rocket::trace::Trace;
 
 use rocket::tokio::time::timeout;
 use rocket::tokio::sync::{OwnedSemaphorePermit, Semaphore, Mutex};

core/lib/Cargo.toml

@@ -84,7 +84,7 @@ thread_local = { version = "1.1", optional = true }
 version = "0.3.18"
 optional = true
 default-features = false
-features = ["fmt", "tracing-log"]
+features = ["fmt", "tracing-log", "parking_lot"]
 
 [dependencies.rocket_codegen]
 version = "0.6.0-dev"

core/lib/src/config/config.rs

@@ -10,7 +10,7 @@ use crate::config::{ShutdownConfig, Ident, CliColors};
 use crate::request::{self, Request, FromRequest};
 use crate::http::uncased::Uncased;
 use crate::data::Limits;
-use crate::trace::Traceable;
+use crate::trace::{Trace, TraceFormat};
 
 /// Rocket server configuration.
 ///
@@ -26,9 +26,10 @@ use crate::trace::Traceable;
 /// the debug profile while [`Config::release_default()`] the default values for
 /// the release profile. The [`Config::default()`] method automatically selects
 /// the appropriate of the two based on the selected profile. With the exception
-/// of `log_level`, which is `normal` in `debug` and `critical` in `release`,
-/// and `secret_key`, which is regenerated from a random value if not set in
-/// "debug" mode only, all default values are identical in all profiles.
+/// of `log_level` and `log_format`, which are `info` / `pretty` in `debug` and
+/// `error` / `compact` in `release`, and `secret_key`, which is regenerated
+/// from a random value if not set in "debug" mode only, all default values are
+/// identical in all profiles.
 ///
 /// # Provider Details
 ///
@@ -124,6 +125,8 @@ pub struct Config {
     /// Max level to log. **(default: _debug_ `info` / _release_ `error`)**
     #[serde(with = "crate::trace::level")]
     pub log_level: Option<Level>,
+    /// Format to use when logging. **(default: _debug_ `pretty` / _release_ `compact`)**
+    pub log_format: TraceFormat,
     /// Whether to use colors and emoji when logging. **(default:
     /// [`CliColors::Auto`])**
     pub cli_colors: CliColors,
@@ -193,6 +196,7 @@ impl Config {
             secret_key: SecretKey::zero(),
             shutdown: ShutdownConfig::default(),
             log_level: Some(Level::INFO),
+            log_format: TraceFormat::Pretty,
             cli_colors: CliColors::Auto,
             __non_exhaustive: (),
         }
@@ -217,6 +221,7 @@ impl Config {
         Config {
             profile: Self::RELEASE_PROFILE,
             log_level: Some(Level::ERROR),
+            log_format: TraceFormat::Compact,
             ..Config::debug_default()
         }
     }
@@ -354,6 +359,9 @@ impl Config {
     /// The stringy parameter name for setting/extracting [`Config::log_level`].
     pub const LOG_LEVEL: &'static str = "log_level";
 
+    /// The stringy parameter name for setting/extracting [`Config::log_format`].
+    pub const LOG_FORMAT: &'static str = "log_format";
+
     /// The stringy parameter name for setting/extracting [`Config::shutdown`].
     pub const SHUTDOWN: &'static str = "shutdown";
 
@@ -364,8 +372,8 @@ impl Config {
     pub const PARAMETERS: &'static [&'static str] = &[
         Self::WORKERS, Self::MAX_BLOCKING, Self::KEEP_ALIVE, Self::IDENT,
         Self::IP_HEADER, Self::PROXY_PROTO_HEADER, Self::LIMITS,
-        Self::SECRET_KEY, Self::TEMP_DIR, Self::LOG_LEVEL, Self::SHUTDOWN,
-        Self::CLI_COLORS,
+        Self::SECRET_KEY, Self::TEMP_DIR, Self::LOG_LEVEL, Self::LOG_FORMAT,
+        Self::SHUTDOWN, Self::CLI_COLORS,
     ];
 
     /// The stringy parameter name for setting/extracting [`Config::profile`].

core/lib/src/error.rs

@@ -7,7 +7,7 @@ use std::sync::Arc;
 use figment::Profile;
 
 use crate::listener::Endpoint;
-use crate::trace::Traceable;
+use crate::trace::Trace;
 use crate::{Ignite, Orbit, Phase, Rocket};
 
 /// An error that occurs during launch.

core/lib/src/lifecycle.rs

@@ -1,7 +1,7 @@
 use futures::future::{FutureExt, Future};
 
 use crate::{route, catcher, Rocket, Orbit, Request, Response, Data};
-use crate::trace::Traceable;
+use crate::trace::Trace;
 use crate::util::Formatter;
 use crate::data::IoHandler;
 use crate::http::{Method, Status, Header};

core/lib/src/rocket.rs

@@ -11,7 +11,7 @@ use figment::{Figment, Provider};
 use futures::TryFutureExt;
 
 use crate::shutdown::{Stages, Shutdown};
-use crate::trace::{Traceable, TraceableCollection};
+use crate::trace::{Trace, TraceAll};
 use crate::{sentinel, shield::Shield, Catcher, Config, Route};
 use crate::listener::{Bind, DefaultListener, Endpoint, Listener};
 use crate::router::Router;
@@ -247,7 +247,7 @@ impl Rocket<Build> {
               B::Error: fmt::Display,
               M: Fn(&Origin<'a>, T) -> T,
               F: Fn(&mut Self, T),
-              T: Clone + Traceable,
+              T: Clone + Trace,
     {
         let mut base = match base.clone().try_into() {
             Ok(origin) => origin.into_owned(),

core/lib/src/server.rs

@@ -17,7 +17,7 @@ use crate::error::log_server_error;
 use crate::data::{IoStream, RawStream};
 use crate::util::{spawn_inspect, FutureExt, ReaderStream};
 use crate::http::Status;
-use crate::trace::{Traceable, TraceableCollection};
+use crate::trace::{Trace, TraceAll};
 
 type Result<T, E = crate::Error> = std::result::Result<T, E>;
 
@@ -34,6 +34,7 @@ impl Rocket<Orbit> {
         upgrade: Option<hyper::upgrade::OnUpgrade>,
         connection: ConnectionMeta,
     ) -> Result<hyper::Response<ReaderStream<ErasedResponse>>, http::Error> {
+        connection.trace_debug();
         let request = ErasedRequest::new(self, parts, |rocket, parts| {
             Request::from_hyp(rocket, parts, connection).unwrap_or_else(|e| e)
         });

core/lib/src/trace/level.rs

@@ -10,7 +10,7 @@ pub fn serialize<S: Serializer>(level: &Option<Level>, s: S) -> Result<S::Ok, S:
 pub fn deserialize<'de, D: Deserializer<'de>>(de: D) -> Result<Option<Level>, D::Error> {
     struct Visitor;
 
-    const E: &str = r#"one of "off", "error", "warn", "info", "debug", "trace", or a number 0-5"#;
+    const E: &str = r#"one of "off", "error", "warn", "info", "debug", "trace", or 0-5"#;
 
     impl<'de> de::Visitor<'de> for Visitor {
         type Value = Option<Level>;

core/lib/src/trace/mod.rs

@@ -9,15 +9,24 @@ pub mod subscriber;
 pub(crate) mod level;
 
 #[doc(inline)]
-pub use traceable::{Traceable, TraceableCollection};
+pub use traceable::{Trace, TraceAll};
 
 #[doc(inline)]
 pub use macros::*;
 
-pub fn init<'a, T: Into<Option<&'a crate::Config>>>(_config: T) {
-    #[cfg(all(feature = "trace", debug_assertions))]
-    subscriber::RocketFmt::<subscriber::Pretty>::init(_config.into());
-
-    #[cfg(all(feature = "trace", not(debug_assertions)))]
-    subscriber::RocketFmt::<subscriber::Compact>::init(_config.into());
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, serde::Deserialize, serde::Serialize)]
+#[serde(crate = "rocket::serde")]
+pub enum TraceFormat {
+    #[serde(rename = "pretty")]
+    #[serde(alias = "PRETTY")]
+    Pretty,
+    #[serde(rename = "compact")]
+    #[serde(alias = "COMPACT")]
+    Compact
+}
+
+#[cfg_attr(nightly, doc(cfg(feature = "trace")))]
+pub fn init<'a, T: Into<Option<&'a crate::Config>>>(config: T) {
+    #[cfg(feature = "trace")]
+    crate::trace::subscriber::RocketDynFmt::init(config.into())
 }

core/lib/src/trace/subscriber/common.rs

@@ -1,27 +1,23 @@
 use std::fmt;
 use std::cell::Cell;
-use std::sync::OnceLock;
 
-use tracing::{Level, Metadata};
 use tracing::field::Field;
-
-use tracing_subscriber::prelude::*;
-use tracing_subscriber::layer::Layered;
-use tracing_subscriber::{reload, filter, Layer, Registry};
+use tracing::{Level, Metadata};
+use tracing_subscriber::filter;
 use tracing_subscriber::field::RecordFields;
 
 use thread_local::ThreadLocal;
 use yansi::{Condition, Paint, Style};
 
-use crate::config::{Config, CliColors};
-use crate::trace::subscriber::{RecordDisplay, RequestId, RequestIdLayer};
+use crate::config::CliColors;
+use crate::trace::subscriber::RecordDisplay;
 use crate::util::Formatter;
 
 mod private {
-    pub trait FmtKind: Default + Copy + Send + Sync + 'static { }
+    pub trait FmtKind: Send + Sync + 'static { }
 
-    impl FmtKind for crate::trace::subscriber::Pretty {}
-    impl FmtKind for crate::trace::subscriber::Compact {}
+    impl FmtKind for crate::trace::subscriber::Pretty { }
+    impl FmtKind for crate::trace::subscriber::Compact { }
 }
 
 #[derive(Default)]
@@ -32,9 +28,7 @@ pub struct RocketFmt<K: private::FmtKind> {
     pub(crate) style: Style,
 }
 
-pub type Handle<K> = reload::Handle<RocketFmt<K>, Layered<RequestIdLayer, Registry>>;
-
-impl<K: private::FmtKind> RocketFmt<K> {
+impl<K: private::FmtKind + Default + Copy> RocketFmt<K> {
     pub(crate) fn state(&self) -> K {
         self.state.get_or_default().get()
     }
@@ -45,33 +39,9 @@ impl<K: private::FmtKind> RocketFmt<K> {
         update(&mut old);
         cell.set(old);
     }
+}
 
-    pub(crate) fn init_with(config: Option<&Config>, handle: &OnceLock<Handle<K>>)
-        where Self: Layer<Layered<RequestIdLayer, Registry>>
-    {
-        // Do nothing if there's no config and we've already initialized.
-        if config.is_none() && handle.get().is_some() {
-            return;
-        }
-
-        let workers = config.map(|c| c.workers).unwrap_or(num_cpus::get());
-        let cli_colors = config.map(|c| c.cli_colors).unwrap_or(CliColors::Auto);
-        let log_level = config.map(|c| c.log_level).unwrap_or(Some(Level::INFO));
-
-        let formatter = RocketFmt::new(workers, cli_colors, log_level);
-        let (layer, reload_handle) = reload::Layer::new(formatter);
-        let result = tracing_subscriber::registry()
-            .with(RequestId::layer())
-            .with(layer)
-            .try_init();
-
-        if result.is_ok() {
-            assert!(handle.set(reload_handle).is_ok());
-        } if let Some(handle) = handle.get() {
-            assert!(handle.modify(|layer| layer.reset(cli_colors, log_level)).is_ok());
-        }
-    }
-
+impl<K: private::FmtKind> RocketFmt<K> {
     pub fn new(workers: usize, cli_colors: CliColors, level: Option<Level>) -> Self {
         Self {
             state: ThreadLocal::with_capacity(workers),

core/lib/src/trace/subscriber/compact.rs

@@ -1,21 +1,20 @@
+use std::fmt;
+use std::time::Instant;
 use std::num::NonZeroU64;
 
-use std::fmt;
-use std::sync::OnceLock;
-use std::time::Instant;
-
-use time::OffsetDateTime;
 use tracing::{Event, Level, Metadata, Subscriber};
 use tracing::span::{Attributes, Id, Record};
-
 use tracing_subscriber::layer::{Layer, Context};
 use tracing_subscriber::registry::LookupSpan;
 use tracing_subscriber::field::RecordFields;
 
+use time::OffsetDateTime;
 use yansi::{Paint, Painted};
 
 use crate::util::Formatter;
-use crate::trace::subscriber::{Data, Handle, RocketFmt};
+use crate::trace::subscriber::{Data, RocketFmt};
+use crate::http::{Status, StatusClass};
+use super::RecordDisplay;
 
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Compact {
@@ -27,6 +26,7 @@ pub struct Compact {
 pub struct RequestData {
     start: Instant,
     fields: Data,
+    item: Option<(String, String)>,
 }
 
 impl RequestData {
@@ -34,17 +34,12 @@ impl RequestData {
         Self {
             start: Instant::now(),
             fields: Data::new(attrs),
+            item: None,
         }
     }
 }
 
 impl RocketFmt<Compact> {
-    pub fn init(config: Option<&crate::Config>) {
-        static HANDLE: OnceLock<Handle<Compact>> = OnceLock::new();
-
-        Self::init_with(config, &HANDLE);
-    }
-
     fn request_span_id(&self) -> Option<Id> {
         self.state().request.map(Id::from_non_zero_u64)
     }
@@ -69,8 +64,9 @@ impl RocketFmt<Compact> {
             .then_some(meta.target())
             .unwrap_or(meta.name());
 
+        let pad = self.level.map_or(0, |lvl| lvl.as_str().len());
         let timestamp = self.timestamp_for(OffsetDateTime::now_utc());
-        Formatter(move |f| write!(f, "{} {:>5} {} ",
+        Formatter(move |f| write!(f, "{} {:>pad$} {} ",
             timestamp.paint(style).primary().dim(),
             meta.level().paint(style),
             name.paint(style).primary()))
@@ -101,11 +97,17 @@ impl<S: Subscriber + for<'a> LookupSpan<'a>> Layer<S> for RocketFmt<Compact> {
 
     fn on_event(&self, event: &Event<'_>, ctxt: Context<'_, S>) {
         if let Some(id) = self.request_span_id() {
-            if event.metadata().name() == "response" {
+            let name = event.metadata().name();
+            if name == "response" {
                 let req_span = ctxt.span(&id).expect("on_event: req does not exist");
                 let mut exts = req_span.extensions_mut();
                 let data = exts.get_mut::<RequestData>().unwrap();
                 event.record(&mut data.fields);
+            } else if name == "catcher" || name == "route" {
+                let req_span = ctxt.span(&id).expect("on_event: req does not exist");
+                let mut exts = req_span.extensions_mut();
+                let data = exts.get_mut::<RequestData>().unwrap();
+                data.item = event.find_map_display("name", |v| (name.into(), v.to_string()))
             }
 
             if !self.in_debug() {
@@ -175,16 +177,49 @@ impl<S: Subscriber + for<'a> LookupSpan<'a>> Layer<S> for RocketFmt<Compact> {
             let datetime = OffsetDateTime::now_utc() - elapsed;
             let timestamp = self.timestamp_for(datetime);
 
-            let style = self.style(span.metadata());
+            let s = self.style(span.metadata());
             let prefix = self.prefix(span.metadata());
             let chevron = self.chevron(span.metadata());
+            let arrow = "→".paint(s.primary().bright());
 
-            println!("{prefix}{chevron} ({} {}ms) {} {} => {}",
-                timestamp.paint(style).primary().dim(),
+            let status_class = data.fields["status"].parse().ok()
+                .and_then(Status::from_code)
+                .map(|status| status.class());
+
+            let status_style = match status_class {
+                Some(StatusClass::Informational) => s,
+                Some(StatusClass::Success) => s.green(),
+                Some(StatusClass::Redirection) => s.magenta(),
+                Some(StatusClass::ClientError) => s.yellow(),
+                Some(StatusClass::ServerError) => s.red(),
+                Some(StatusClass::Unknown) => s.cyan(),
+                None => s.primary(),
+            };
+
+            let autohandle = Formatter(|f| {
+                match data.fields.get("autohandled") {
+                    Some("true") => write!(f, " {} {}", "via".paint(s.dim()), "GET".paint(s)),
+                    _ => Ok(())
+                }
+            });
+
+            let item = Formatter(|f| {
+                match &data.item {
+                    Some((kind, name)) => write!(f,
+                        "{} {} {arrow} ",
+                        kind.paint(s),
+                        name.paint(s.bold()),
+                    ),
+                    None => Ok(())
+                }
+            });
+
+            println!("{prefix}{chevron} ({} {}ms) {}{autohandle} {} {arrow} {item}{}",
+                timestamp.paint(s).primary().dim(),
                 elapsed.as_millis(),
-                &data.fields["method"].paint(style),
+                &data.fields["method"].paint(s),
                 &data.fields["uri"],
-                &data.fields["status"],
+                &data.fields["status"].paint(status_style),
             );
         }
     }

core/lib/src/trace/subscriber/dynamic.rs

@@ -0,0 +1,96 @@
+use std::sync::OnceLock;
+
+use tracing::{Dispatch, Event, Level, Metadata};
+use tracing::subscriber::{Subscriber, Interest};
+use tracing::span::{Attributes, Id, Record};
+use tracing_subscriber::registry::{Registry, LookupSpan};
+use tracing_subscriber::layer::{Context, Layer, Layered, SubscriberExt};
+use tracing_subscriber::reload;
+use tracing_subscriber::util::SubscriberInitExt;
+
+use crate::config::{Config, CliColors};
+use crate::trace::subscriber::{Compact, Pretty, RequestId, RequestIdLayer, RocketFmt};
+use crate::trace::TraceFormat;
+
+pub struct RocketDynFmt {
+    inner: either::Either<RocketFmt<Compact>, RocketFmt<Pretty>>,
+}
+
+impl From<RocketFmt<Compact>> for RocketDynFmt {
+    fn from(value: RocketFmt<Compact>) -> Self {
+        RocketDynFmt { inner: either::Either::Left(value) }
+    }
+}
+
+impl From<RocketFmt<Pretty>> for RocketDynFmt {
+    fn from(value: RocketFmt<Pretty>) -> Self {
+        RocketDynFmt { inner: either::Either::Right(value) }
+    }
+}
+
+impl RocketDynFmt {
+    pub fn init(config: Option<&Config>) {
+        type Handle = reload::Handle<RocketDynFmt, Layered<RequestIdLayer, Registry>>;
+
+        static HANDLE: OnceLock<Handle> = OnceLock::new();
+
+        // Do nothing if there's no config and we've already initialized.
+        if config.is_none() && HANDLE.get().is_some() {
+            return;
+        }
+
+        let workers = config.map(|c| c.workers).unwrap_or(num_cpus::get());
+        let colors = config.map(|c| c.cli_colors).unwrap_or(CliColors::Auto);
+        let level = config.map(|c| c.log_level).unwrap_or(Some(Level::INFO));
+        let format = config.map(|c| c.log_format).unwrap_or(TraceFormat::Pretty);
+
+        let formatter = |format| match format {
+            TraceFormat::Pretty => Self::from(RocketFmt::<Pretty>::new(workers, colors, level)),
+            TraceFormat::Compact => Self::from(RocketFmt::<Compact>::new(workers, colors, level)),
+        };
+
+        let (layer, reload_handle) = reload::Layer::new(formatter(format));
+        let result = tracing_subscriber::registry()
+            .with(RequestId::layer())
+            .with(layer)
+            .try_init();
+
+        if result.is_ok() {
+            assert!(HANDLE.set(reload_handle).is_ok());
+        } if let Some(handle) = HANDLE.get() {
+            assert!(handle.modify(|layer| *layer = formatter(format)).is_ok());
+        }
+    }
+
+    pub fn reset(&mut self, cli_colors: CliColors, level: Option<Level>) {
+        either::for_both!(&mut self.inner, f => f.reset(cli_colors, level))
+    }
+}
+
+macro_rules! forward {
+    ($T:ident => $(& $r:tt)? $method:ident ( $($p:ident : $t:ty),* ) $(-> $R:ty)?) => {
+        #[inline(always)]
+        fn $method(& $($r)? self $(, $p : $t)*) $(-> $R)? {
+            match & $($r)* self.inner {
+                either::Either::Left(layer) => Layer::<$T>::$method(layer, $($p),*),
+                either::Either::Right(layer) => Layer::<$T>::$method(layer, $($p),*),
+            }
+        }
+    };
+}
+
+impl<S: Subscriber + for<'a> LookupSpan<'a>> Layer<S> for RocketDynFmt {
+    forward!(S => on_register_dispatch(subscriber: &Dispatch));
+    forward!(S => &mut on_layer(subscriber: &mut S));
+    forward!(S => register_callsite(metadata: &'static Metadata<'static>) -> Interest);
+    forward!(S => enabled(metadata: &Metadata<'_>, ctx: Context<'_, S>) -> bool);
+    forward!(S => on_new_span(attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>));
+    forward!(S => on_record(_span: &Id, _values: &Record<'_>, _ctx: Context<'_, S>));
+    forward!(S => on_follows_from(_span: &Id, _follows: &Id, _ctx: Context<'_, S>));
+    forward!(S => event_enabled(_event: &Event<'_>, _ctx: Context<'_, S>) -> bool);
+    forward!(S => on_event(_event: &Event<'_>, _ctx: Context<'_, S>));
+    forward!(S => on_enter(_id: &Id, _ctx: Context<'_, S>));
+    forward!(S => on_exit(_id: &Id, _ctx: Context<'_, S>));
+    forward!(S => on_close(_id: Id, _ctx: Context<'_, S>));
+    forward!(S => on_id_change(_old: &Id, _new: &Id, _ctx: Context<'_, S>));
+}

core/lib/src/trace/subscriber/mod.rs

@@ -1,6 +1,7 @@
 mod visit;
 mod pretty;
 mod compact;
+mod dynamic;
 mod common;
 mod request_id;
 
@@ -8,6 +9,6 @@ pub use pretty::Pretty;
 pub use compact::Compact;
 pub use common::RocketFmt;
 pub use request_id::{RequestId, RequestIdLayer};
+pub use dynamic::RocketDynFmt;
 
-pub(crate) use common::Handle;
 pub(crate) use visit::{RecordDisplay, Data};

core/lib/src/trace/subscriber/pretty.rs

@@ -1,18 +1,16 @@
 use std::fmt;
-use std::sync::OnceLock;
 
+use tracing::field::Field;
 use tracing::{Event, Level, Metadata, Subscriber};
 use tracing::span::{Attributes, Id, Record};
-use tracing::field::Field;
-
 use tracing_subscriber::layer::{Layer, Context};
 use tracing_subscriber::registry::LookupSpan;
 use tracing_subscriber::field::RecordFields;
 
 use yansi::{Paint, Painted};
 
-use crate::trace::subscriber::{Data, RecordDisplay, Handle, RocketFmt};
 use crate::util::Formatter;
+use crate::trace::subscriber::{Data, RecordDisplay, RocketFmt};
 
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Pretty {
@@ -20,12 +18,6 @@ pub struct Pretty {
 }
 
 impl RocketFmt<Pretty> {
-    pub fn init(config: Option<&crate::Config>) {
-        static HANDLE: OnceLock<Handle<Pretty>> = OnceLock::new();
-
-        Self::init_with(config, &HANDLE);
-    }
-
     fn indent(&self) -> &'static str {
         static INDENT: &[&str] = &["", "   ", "      "];
         INDENT.get(self.state().depth as usize).copied().unwrap_or("         ")

core/lib/src/trace/subscriber/visit.rs

@@ -7,6 +7,7 @@ use tracing_subscriber::field::RecordFields;
 use crate::util::Formatter;
 
 pub trait RecordDisplay: RecordFields {
+    fn find_map_display<T, F: Fn(&dyn fmt::Display) -> T>(&self, name: &str, f: F) -> Option<T>;
     fn record_display<F: FnMut(&Field, &dyn fmt::Display)>(&self, f: F);
 }
 
@@ -53,6 +54,12 @@ impl Visit for Data {
 }
 
 impl<T: RecordFields> RecordDisplay for T {
+    fn find_map_display<V, F: Fn(&dyn fmt::Display) -> V>(&self, name: &str, f: F) -> Option<V> {
+        let mut value = None;
+        self.record_display(|field, item| if field.name() == name { value = Some(f(item)); });
+        value
+    }
+
     fn record_display<F: FnMut(&Field, &dyn fmt::Display)>(&self, f: F) {
         struct DisplayVisit<F>(F);
 

core/lib/src/trace/traceable.rs

@@ -1,5 +1,6 @@
 use std::error::Error as StdError;
 
+use crate::request::ConnectionMeta;
 use crate::sentinel::Sentry;
 use crate::util::Formatter;
 use crate::{route, Catcher, Config, Error, Request, Response, Route};
@@ -9,7 +10,7 @@ use figment::Figment;
 use rocket::http::Header;
 use tracing::Level;
 
-pub trait Traceable {
+pub trait Trace {
     fn trace(&self, level: Level);
 
     #[inline(always)] fn trace_info(&self) { self.trace(Level::INFO) }
@@ -19,7 +20,7 @@ pub trait Traceable {
     #[inline(always)] fn trace_trace(&self) { self.trace(Level::TRACE) }
 }
 
-pub trait TraceableCollection: Sized {
+pub trait TraceAll: Sized {
     fn trace_all(self, level: Level);
 
     #[inline(always)] fn trace_all_info(self) { self.trace_all(Level::INFO) }
@@ -29,20 +30,20 @@ pub trait TraceableCollection: Sized {
     #[inline(always)] fn trace_all_trace(self) { self.trace_all(Level::TRACE) }
 }
 
-impl<T: Traceable, I: IntoIterator<Item = T>> TraceableCollection for I {
+impl<T: Trace, I: IntoIterator<Item = T>> TraceAll for I {
     fn trace_all(self, level: Level) {
         self.into_iter().for_each(|i| i.trace(level))
     }
 }
 
-impl<T: Traceable> Traceable for &T {
+impl<T: Trace> Trace for &T {
     #[inline(always)]
     fn trace(&self, level: Level) {
         T::trace(self, level)
     }
 }
 
-impl Traceable for Figment {
+impl Trace for Figment {
     fn trace(&self, level: Level) {
         for param in Config::PARAMETERS {
             if let Some(source) = self.find_metadata(param) {
@@ -69,11 +70,12 @@ impl Traceable for Figment {
     }
 }
 
-impl Traceable for Config {
+impl Trace for Config {
     fn trace(&self, level: Level) {
         event! { level, "config",
             http2 = cfg!(feature = "http2"),
             log_level = self.log_level.map(|l| l.as_str()),
+            log_format = ?self.log_format,
             cli_colors = %self.cli_colors,
             workers = self.workers,
             max_blocking = self.max_blocking,
@@ -130,7 +132,7 @@ impl Traceable for Config {
     }
 }
 
-impl Traceable for Route {
+impl Trace for Route {
     fn trace(&self, level: Level) {
         event! { level, "route",
             name = self.name.as_ref().map(|n| &**n),
@@ -153,7 +155,7 @@ impl Traceable for Route {
     }
 }
 
-impl Traceable for Catcher {
+impl Trace for Catcher {
     fn trace(&self, level: Level) {
         event! { level, "catcher",
             name = self.name.as_ref().map(|n| &**n),
@@ -167,19 +169,19 @@ impl Traceable for Catcher {
     }
 }
 
-impl Traceable for &dyn crate::fairing::Fairing {
+impl Trace for &dyn crate::fairing::Fairing {
     fn trace(&self, level: Level) {
         self.info().trace(level)
     }
 }
 
-impl Traceable for crate::fairing::Info {
+impl Trace for crate::fairing::Info {
     fn trace(&self, level: Level) {
         event!(level, "fairing", name = self.name, kind = %self.kind)
     }
 }
 
-impl Traceable for figment::error::Kind {
+impl Trace for figment::error::Kind {
     fn trace(&self, _: Level) {
         use figment::error::{OneOf as V, Kind::*};
 
@@ -200,7 +202,7 @@ impl Traceable for figment::error::Kind {
     }
 }
 
-impl Traceable for figment::Error {
+impl Trace for figment::Error {
     fn trace(&self, _: Level) {
         for e in self.clone() {
             let span = tracing::error_span! {
@@ -218,13 +220,13 @@ impl Traceable for figment::Error {
     }
 }
 
-impl Traceable for Header<'_> {
+impl Trace for Header<'_> {
     fn trace(&self, level: Level) {
         event!(level, "header", name = self.name().as_str(), value = self.value());
     }
 }
 
-impl Traceable for route::Outcome<'_> {
+impl Trace for route::Outcome<'_> {
     fn trace(&self, level: Level) {
         event!(level, "outcome",
             outcome = match self {
@@ -241,19 +243,19 @@ impl Traceable for route::Outcome<'_> {
     }
 }
 
-impl Traceable for Response<'_> {
+impl Trace for Response<'_> {
     fn trace(&self, level: Level) {
         event!(level, "response", status = self.status().code);
     }
 }
 
-impl Traceable for Error {
+impl Trace for Error {
     fn trace(&self, level: Level) {
         self.kind.trace(level);
     }
 }
 
-impl Traceable for Sentry {
+impl Trace for Sentry {
     fn trace(&self, level: Level) {
         let (file, line, col) = self.location;
         event!(level, "sentry",
@@ -263,13 +265,22 @@ impl Traceable for Sentry {
     }
 }
 
-impl Traceable for Request<'_> {
+impl Trace for Request<'_> {
     fn trace(&self, level: Level) {
         event!(level, "request", method = %self.method(), uri = %self.uri())
     }
 }
 
-impl Traceable for ErrorKind {
+impl Trace for ConnectionMeta {
+    fn trace(&self, level: Level) {
+        event!(level, "connection",
+            endpoint = self.peer_endpoint.as_ref().map(display),
+            certs = self.peer_certs.is_some(),
+        )
+    }
+}
+
+impl Trace for ErrorKind {
     fn trace(&self, level: Level) {
         use ErrorKind::*;
 

examples/fairings/src/main.rs

@@ -6,7 +6,7 @@ use std::sync::Arc;
 
 use rocket::{Rocket, Request, State, Data, Build};
 use rocket::fairing::{self, AdHoc, Fairing, Info, Kind};
-use rocket::trace::Traceable;
+use rocket::trace::Trace;
 use rocket::http::Method;
 
 struct Token(i64);

examples/tls/src/redirector.rs

@@ -8,7 +8,7 @@ use rocket::{route, Error, Request, Data, Route, Orbit, Rocket, Ignite};
 use rocket::fairing::{Fairing, Info, Kind};
 use rocket::response::Redirect;
 use rocket::listener::tcp::TcpListener;
-use rocket::trace::Traceable;
+use rocket::trace::Trace;
 
 #[derive(Debug, Clone, Copy, Default)]
 pub struct Redirector(u16);

testbench/src/server.rs

@@ -9,7 +9,7 @@ use rocket::fairing::AdHoc;
 use rocket::listener::{Bind, DefaultListener};
 use rocket::serde::{Deserialize, DeserializeOwned, Serialize};
 use rocket::{Build, Ignite, Rocket};
-use rocket::trace::Traceable;
+use rocket::trace::Trace;
 
 use ipc_channel::ipc::{IpcOneShotServer, IpcReceiver, IpcSender};