Address feedback for logging PR

rclrs/src/logging.rs

@@ -81,7 +81,7 @@ macro_rules! log {
         // Note: that issue appears to be specific to jetbrains intellisense however,
         // observed same/similar behaviour with rust-analyzer/rustc
         use std::sync::{Once, OnceLock, Mutex};
-        use std::time::SystemTime;
+        use std::time::{SystemTime, Instant};
 
         // We wrap the functional body of the macro inside of a closure which
         // we immediately trigger. This allows us to use `return` to exit the
@@ -128,19 +128,64 @@ macro_rules! log {
             // of that interval.
             let throttle = params.get_throttle();
             if throttle > std::time::Duration::ZERO {
-                static LAST_LOG_TIME: OnceLock<Mutex<SystemTime>> = OnceLock::new();
-                let last_log_time = LAST_LOG_TIME.get_or_init(|| {
-                    Mutex::new(std::time::SystemTime::now())
-                });
-
-                if !first_time {
-                    let now = std::time::SystemTime::now();
-                    let mut previous = last_log_time.lock().unwrap();
-                    if now >= *previous + throttle {
-                        *previous = now;
-                    } else {
-                        // We are still inside the throttle interval, so just exit here.
-                        return;
+                match params.get_throttle_clock() {
+                    $crate::ThrottleClock::SteadyTime => {
+                        static LAST_LOG_STEADY_TIME: OnceLock<Mutex<Instant>> = OnceLock::new();
+                        let last_log_time = LAST_LOG_STEADY_TIME.get_or_init(|| {
+                            Mutex::new(Instant::now())
+                        });
+
+                        if !first_time {
+                            let now = Instant::now();
+                            let mut previous = last_log_time.lock().unwrap();
+                            if now >= *previous + throttle {
+                                *previous = now;
+                            } else {
+                                // We are still inside the throttle interval, so just exit here.
+                                return;
+                            }
+                        }
+                    }
+                    $crate::ThrottleClock::SystemTime => {
+                        static LAST_LOG_SYSTEM_TIME: OnceLock<Mutex<SystemTime>> = OnceLock::new();
+                        let last_log_time = LAST_LOG_SYSTEM_TIME.get_or_init(|| {
+                            Mutex::new(SystemTime::now())
+                        });
+
+                        if !first_time {
+                            let now = SystemTime::now();
+                            let mut previous = last_log_time.lock().unwrap();
+                            if now >= *previous + throttle {
+                                *previous = now;
+                            } else {
+                                // We are still inside the throttle interval, so just exit here.
+                                return;
+                            }
+                        }
+                    }
+                    $crate::ThrottleClock::Clock(clock) => {
+                        static LAST_LOG_CLOCK_TIME: OnceLock<Mutex<$crate::Time>> = OnceLock::new();
+                        let last_log_time = LAST_LOG_CLOCK_TIME.get_or_init(|| {
+                            Mutex::new(clock.now())
+                        });
+
+                        if !first_time {
+                            let now = clock.now();
+                            let mut previous = last_log_time.lock().unwrap();
+
+                            let new_interval = !now.compare_with(
+                                &(previous.clone() + throttle),
+                                |now, interval| now < interval,
+                            )
+                            .is_some_and(|eval| eval);
+
+                            if new_interval {
+                                *previous = now;
+                            } else {
+                                // We are still inside the throttle interval, so just exit here.
+                                return;
+                            }
+                        }
                     }
                 }
             }
@@ -592,8 +637,26 @@ mod tests {
         assert_eq!(last_severity(), LogSeverity::Error);
         assert_eq!(count_message("error for custom logger"), 2);
 
-        reset_logging_output_handler();
+        // Test whether throttling works correctly with a ROS clock
+        let (clock, source) = Clock::with_source();
+        source.set_ros_time_override(0);
+
+        for i in 0..15 {
+            log!(
+                "logger"
+                    .throttle(Duration::from_nanos(10))
+                    .throttle_clock(ThrottleClock::Clock(&clock)),
+                "custom clock throttled message",
+            );
+            source.set_ros_time_override(i);
+        }
 
+        // The throttle interval is 10ns and the loop shifted the time from 0ns
+        // to 14ns, triggering the log macro once per nanosecond. That means we
+        // should see two messages in the log.
+        assert_eq!(count_message("custom clock throttled message"), 2);
+
+        reset_logging_output_handler();
         Ok(())
     }
 

rclrs/src/logging/log_params.rs

@@ -1,4 +1,4 @@
-use crate::rcl_bindings::RCUTILS_LOG_SEVERITY;
+use crate::{rcl_bindings::RCUTILS_LOG_SEVERITY, Clock};
 use std::{borrow::Borrow, ffi::CString, time::Duration};
 
 /// These parameters determine the behavior of an instance of logging.
@@ -16,6 +16,8 @@ pub struct LogParams<'a> {
     /// e.g. if `log!(logger.throttle(Duration::from_secs(1)), "message");` is called every 10ms, it will
     /// nevertheless only be published once per second.
     throttle: Duration,
+    /// Specify a clock to use for throttling. By default this will be [`ThrottleClock::SteadyTime`].
+    throttle_clock: ThrottleClock<'a>,
     /// The log message will only published if the specified expression evaluates to true
     only_if: bool,
 }
@@ -28,6 +30,7 @@ impl<'a> LogParams<'a> {
             severity: Default::default(),
             occurs: Default::default(),
             throttle: Duration::new(0, 0),
+            throttle_clock: Default::default(),
             only_if: true,
         }
     }
@@ -52,6 +55,11 @@ impl<'a> LogParams<'a> {
         self.throttle
     }
 
+    /// Get the throttle clock
+    pub fn get_throttle_clock(&self) -> ThrottleClock<'a> {
+        self.throttle_clock
+    }
+
     /// Get the arbitrary filter set by the user
     pub fn get_user_filter(&self) -> bool {
         self.only_if
@@ -98,6 +106,13 @@ pub trait ToLogParams<'a>: Sized {
         params
     }
 
+    /// Set the clock that will be used to control [throttling][Self::throttle].
+    fn throttle_clock(self, clock: ThrottleClock<'a>) -> LogParams<'a> {
+        let mut params = self.to_log_params();
+        params.throttle_clock = clock;
+        params
+    }
+
     /// The log will not be published if a `false` expression is passed into
     /// this function.
     ///
@@ -239,6 +254,18 @@ pub enum LogOccurrence {
     SkipFirst,
 }
 
+/// This parameter can specify a type of clock for a logger to use when throttling.
+#[derive(Debug, Default, Clone, Copy)]
+pub enum ThrottleClock<'a> {
+    /// Use [`std::time::Instant`] as a clock.
+    #[default]
+    SteadyTime,
+    /// Use [`std::time::SystemTime`] as a clock.
+    SystemTime,
+    /// Use some [`Clock`] as a clock.
+    Clock(&'a Clock),
+}
+
 impl Default for LogOccurrence {
     fn default() -> Self {
         Self::All

rclrs/src/logging/logger.rs

@@ -1,4 +1,4 @@
-use std::{borrow::Borrow, ffi::CString};
+use std::{borrow::Borrow, ffi::CString, sync::Arc};
 
 use crate::{
     rcl_bindings::{rcutils_logging_set_default_logger_level, rcutils_logging_set_logger_level},
@@ -21,26 +21,30 @@ use crate::{
 ///
 /// [1]: crate::log
 /// [2]: crate::Node::logger
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct Logger {
-    name: Box<str>,
-    c_name: CString,
+    name: Arc<str>,
+    c_name: Arc<CString>,
 }
 
 impl Logger {
     /// Create a new logger with the given name.
     pub fn new(name: impl Borrow<str>) -> Result<Logger, RclrsError> {
-        let name: Box<str> = name.borrow().into();
-        let c_name = match CString::new(name.clone().into_string()) {
+        let name: Arc<str> = name.borrow().into();
+        let c_name = match CString::new((*name).to_owned()) {
             Ok(c_name) => c_name,
             Err(err) => {
                 return Err(RclrsError::StringContainsNul {
-                    s: name.into_string(),
+                    s: (*name).to_owned(),
                     err,
                 });
             }
         };
 
-        Ok(Self { name, c_name })
+        Ok(Self {
+            name,
+            c_name: Arc::new(c_name),
+        })
     }
 
     /// Create a new logger which will be a child of this logger.
@@ -99,3 +103,9 @@ impl Default for Logger {
         Self::new("").unwrap()
     }
 }
+
+impl std::hash::Hash for Logger {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.name.hash(state);
+    }
+}

rclrs/src/node.rs

@@ -82,7 +82,7 @@ pub struct Node {
 pub(crate) struct NodeHandle {
     pub(crate) rcl_node: Mutex<rcl_node_t>,
     pub(crate) context_handle: Arc<ContextHandle>,
-    /// In the humbe distro, rcl is sensitive to the address of the rcl_node_t
+    /// In the humble distro, rcl is sensitive to the address of the rcl_node_t
     /// object being moved (this issue seems to be gone in jazzy), so we need
     /// to initialize the rcl_node_t in-place inside this struct. In the event
     /// that the initialization fails (e.g. it was created with an invalid name)