/build/source/nativelink-metric/src/lib.rs

Source
// Copyright 2024 The NativeLink Authors. All rights reserved.
//
// Licensed under the Functional Source License, Version 1.1, Apache 2.0 Future License (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    See LICENSE file for details
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use core::hash::BuildHasher;
use core::sync::atomic::{AtomicI64, AtomicU64, Ordering};
use core::time::Duration;
use std::borrow::Cow;
use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
use std::sync::{Arc, Weak};
use std::time::{SystemTime, UNIX_EPOCH};

pub use nativelink_metric_macro_derive::MetricsComponent;
pub use tracing::{
    error as __metric_error, info as __metric_info, info_span as __metric_info_span,
};

/// Error type for the metrics library.
// Note: We do not use the nativelink-error struct because
// we'd end up in a circular dependency if we did, because
// nativelink-error uses the metrics library.
#[derive(Debug)]
pub struct Error(String);

impl core::fmt::Display for Error {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        write!(f, "{}", self.0)
    }
}

impl core::error::Error for Error {}

/// Holds metadata about the field that is being published.
#[derive(Debug, Default, Clone)]
pub struct MetricFieldData<'a> {
    pub name: Cow<'a, str>,
    pub help: Cow<'a, str>,
    pub group: Cow<'a, str>,
}

/// The final primitive data that is being published with the kind.
#[derive(Debug)]
pub enum MetricPublishKnownKindData {
    Counter(u64),
    String(String),
    Component,
}

/// The kind of metric that is being published.
// Note: This enum will be translate in-and-out
// of a u64 when traversing the `tracing::event`
// boundary for efficiency reasons.
#[derive(Clone, Copy, Debug)]
#[repr(u8)]
pub enum MetricKind {
    Default = 0,
    Counter = 1,
    String = 2,
    Component = 3,
}

impl From<u64> for MetricKind {
    fn from(value: u64) -> Self {
        match value {
            0 | 4_u64..=u64::MAX => Self::Default,
            1 => Self::Counter,
            2 => Self::String,
            3 => Self::Component,
        }
    }
}

impl MetricKind {
    #[must_use]
    pub fn into_known_kind(&self, default_kind: Self) -> MetricPublishKnownKindData {
        let this = if matches!(self, Self::Default) {
            default_kind
        } else {
            *self
        };
        match this {
            Self::Counter => MetricPublishKnownKindData::Counter(0),
            Self::String => MetricPublishKnownKindData::String(String::new()),
            Self::Component => MetricPublishKnownKindData::Component,
            Self::Default => unreachable!("Default should have been handled"),
        }
    }
}

/// The trait that all components that can be published must implement.
pub trait MetricsComponent {
    /// # Errors
    ///
    /// Will return `Err` if we can't publish the metric.
    fn publish(
        &self,
        kind: MetricKind,
        _field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error>;
}

pub trait RootMetricsComponent: MetricsComponent + Send + Sync {
    /// # Errors
    ///
    /// Will return `Err` if we can't publish the metric.
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        MetricsComponent::publish(self, kind, field_metadata)
    }
}

impl<T: MetricsComponent> MetricsComponent for Option<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        self.as_ref()
            .map_or(Ok(MetricPublishKnownKindData::Component), |value| {
                value.publish(kind, field_metadata)
            })
    }
}

impl<T: MetricsComponent> MetricsComponent for tokio::sync::watch::Sender<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        self.borrow().publish(kind, field_metadata)
    }
}

impl<T: MetricsComponent + ?Sized> MetricsComponent for Arc<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        self.as_ref().publish(kind, field_metadata)
    }
}

impl<T: MetricsComponent, S: BuildHasher> MetricsComponent for HashSet<T, S> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        for (i, item) in self.iter().enumerate() {
            let guard = group!(i).entered();
            let publish_result = item.publish(kind, field_metadata.clone())?;
            drop(guard);
            match publish_result {
                MetricPublishKnownKindData::Counter(value) => {
                    publish!(
                        i,
                        &value,
                        MetricKind::Counter,
                        field_metadata.help.to_string()
                    );
                }
                MetricPublishKnownKindData::String(value) => {
                    publish!(
                        i,
                        &value,
                        MetricKind::String,
                        field_metadata.help.to_string()
                    );
                }
                MetricPublishKnownKindData::Component => {}
            }
        }
        Ok(MetricPublishKnownKindData::Component)
    }
}

impl<U: ToString, T: MetricsComponent, S: BuildHasher> MetricsComponent for HashMap<U, T, S> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        for (key, item) in self {
            let guard = group!(key).entered();
            let publish_result = item.publish(kind, field_metadata.clone())?;
            drop(guard);
            match publish_result {
                MetricPublishKnownKindData::Counter(value) => {
                    publish!(
                        key,
                        &value,
                        MetricKind::Counter,
                        field_metadata.help.to_string()
                    );
                }
                MetricPublishKnownKindData::String(value) => {
                    publish!(
                        key,
                        &value,
                        MetricKind::String,
                        field_metadata.help.to_string()
                    );
                }
                MetricPublishKnownKindData::Component => {}
            }
        }
        Ok(MetricPublishKnownKindData::Component)
    }
}

impl<U: ToString, T: MetricsComponent> MetricsComponent for BTreeMap<U, T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        for (key, item) in self {
            group!(key).in_scope(|| item.publish(kind, field_metadata.clone()))?;
        }
        Ok(MetricPublishKnownKindData::Component)
    }
}

impl<T: MetricsComponent> MetricsComponent for BTreeSet<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        for (i, item) in self.iter().enumerate() {
            group!(i).in_scope(|| item.publish(kind, field_metadata.clone()))?;
        }
        Ok(MetricPublishKnownKindData::Component)
    }
}

impl<T: MetricsComponent> MetricsComponent for Vec<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        for (i, item) in self.iter().enumerate() {
            group!(i).in_scope(|| item.publish(kind, field_metadata.clone()))?;
        }
        Ok(MetricPublishKnownKindData::Component)
    }
}

impl<T: MetricsComponent + ?Sized> MetricsComponent for Weak<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let Some(this) = self.upgrade() else {
            return Ok(MetricPublishKnownKindData::Component);
        };
        this.as_ref().publish(kind, field_metadata)
    }
}

impl<T, E> MetricsComponent for Result<T, E>
where
    T: MetricsComponent,
    E: MetricsComponent,
{
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        match self {
            Ok(value) => value.publish(kind, field_metadata),
            Err(value) => value.publish(kind, field_metadata),
        }
    }
}

impl MetricsComponent for Duration {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        self.as_secs_f64().publish(kind, field_metadata)
    }
}

impl MetricsComponent for SystemTime {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        Self::now().duration_since(UNIX_EPOCH).map_or_else(
            |_| Err(Error("SystemTime before UNIX EPOCH!".to_string())),
            |n| n.as_secs().publish(kind, field_metadata),
        )
    }
}

impl MetricsComponent for f64 {
    fn publish(
        &self,
        _kind: MetricKind,
        _field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        Ok(MetricPublishKnownKindData::String(self.to_string()))
    }
}

impl MetricsComponent for bool {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let value = u64::from(*self);
        value.publish(kind, field_metadata)
    }
}

impl MetricsComponent for i32 {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let value = u64::try_from(*self)
            .map_err(|_| Error(format!("Could not convert {self} to u64 in metrics lib")))?;
        value.publish(kind, field_metadata)
    }
}

impl MetricsComponent for u64 {
    fn publish(
        &self,
        kind: MetricKind,
        _field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let mut known_kind_data = kind.into_known_kind(MetricKind::Counter);
        match &mut known_kind_data {
            MetricPublishKnownKindData::Counter(data) => {
                *data = *self;
            }
            MetricPublishKnownKindData::String(data) => {
                *data = self.to_string();
            }
            MetricPublishKnownKindData::Component => {}
        }
        Ok(known_kind_data)
    }
}

impl MetricsComponent for i64 {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let value = u64::try_from(*self)
            .map_err(|_| Error(format!("Could not convert {self} to u64 in metrics lib")))?;
        value.publish(kind, field_metadata)
    }
}

impl MetricsComponent for u32 {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        u64::from(*self).publish(kind, field_metadata)
    }
}

impl MetricsComponent for usize {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let value = u64::try_from(*self)
            .map_err(|_| Error(format!("Could not convert {self} to u64 in metrics lib")))?;
        value.publish(kind, field_metadata)
    }
}

impl MetricsComponent for AtomicU64 {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        self.load(Ordering::Acquire).publish(kind, field_metadata)
    }
}

impl MetricsComponent for AtomicI64 {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        self.load(Ordering::Acquire).publish(kind, field_metadata)
    }
}

impl MetricsComponent for String {
    fn publish(
        &self,
        kind: MetricKind,
        _field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        let mut known_kind_data = kind.into_known_kind(MetricKind::String);
        match &mut known_kind_data {
            MetricPublishKnownKindData::Counter(data) => {
                *data = self.parse::<u64>().map_err(|_| {
                    Error(format!(
                        "Could not convert String '{self}' to u64 in metrics lib"
                    ))
                })?;
            }
            MetricPublishKnownKindData::String(data) => {
                data.clone_from(self);
            }
            MetricPublishKnownKindData::Component => {}
        }
        Ok(known_kind_data)
    }
}

impl<T: MetricsComponent> MetricsComponent for async_lock::Mutex<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        // It is safe to block in the publishing thread.
        let lock = self.lock_blocking();
        lock.publish(kind, field_metadata)
    }
}

impl<T: MetricsComponent> MetricsComponent for parking_lot::Mutex<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        // It is safe to block in the publishing thread.
        let lock = self.lock();
        lock.publish(kind, field_metadata)
    }
}

impl<T: MetricsComponent> MetricsComponent for parking_lot::RwLock<T> {
    fn publish(
        &self,
        kind: MetricKind,
        field_metadata: MetricFieldData,
    ) -> Result<MetricPublishKnownKindData, Error> {
        // It is safe to block in the publishing thread.
        let lock = self.read();
        lock.publish(kind, field_metadata)
    }
}

#[macro_export]
macro_rules! group {
    ($name:expr) => {
        $crate::__metric_info_span!(target: "nativelink_metric", "", __name = $name.to_string())
    };
}

#[macro_export]
macro_rules! publish {
    ($name:expr, $value:expr, $metric_kind:expr, $help:expr) => {
        $crate::publish!($name, $value, $metric_kind, $help, "")
    };
    ($name:expr, $value:expr, $metric_kind:expr, $help:expr, $group:expr) => {
        {
            let _maybe_entered = if !$group.is_empty() {
                Some($crate::group!($group).entered())
            } else {
                None
            };
            let name = $name.to_string();
            let field_metadata = $crate::MetricFieldData {
                name: ::std::borrow::Cow::Borrowed(&name),
                help: $help.into(),
                group: $group.into(),
            };
            match $crate::MetricsComponent::publish($value, $metric_kind, field_metadata)? {
                $crate::MetricPublishKnownKindData::Counter(value) => {
                    $crate::__metric_info!(
                        target: "nativelink_metric",
                        __value = value,
                        __type = $crate::MetricKind::Counter as u8,
                        __help = $help.to_string(),
                        __name = name
                    );
                }
                $crate::MetricPublishKnownKindData::String(value) => {
                    $crate::__metric_info!(
                        target: "nativelink_metric",
                        __value = value,
                        __type = $crate::MetricKind::String as u8,
                        __help = $help.to_string(),
                        __name = name
                    );
                }
                $crate::MetricPublishKnownKindData::Component => {
                    // Do nothing, data already published.
                }
            }
        }
    };
}

Coverage Report

Created: 2025-10-30 00:14

Line	Count	Source
1		// Copyright 2024 The NativeLink Authors. All rights reserved.
2		//
3		// Licensed under the Functional Source License, Version 1.1, Apache 2.0 Future License (the "License");
4		// you may not use this file except in compliance with the License.
5		// You may obtain a copy of the License at
6		//
7		// See LICENSE file for details
8		//
9		// Unless required by applicable law or agreed to in writing, software
10		// distributed under the License is distributed on an "AS IS" BASIS,
11		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12		// See the License for the specific language governing permissions and
13		// limitations under the License.
14
15		use core::hash::BuildHasher;
16		use core::sync::atomic::{AtomicI64, AtomicU64, Ordering};
17		use core::time::Duration;
18		use std::borrow::Cow;
19		use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
20		use std::sync::{Arc, Weak};
21		use std::time::{SystemTime, UNIX_EPOCH};
22
23		pub use nativelink_metric_macro_derive::MetricsComponent;
24		pub use tracing::{
25		error as __metric_error, info as __metric_info, info_span as __metric_info_span,
26		};
27
28		/// Error type for the metrics library.
29		// Note: We do not use the nativelink-error struct because
30		// we'd end up in a circular dependency if we did, because
31		// nativelink-error uses the metrics library.
32		#[derive(Debug)]
33		pub struct Error(String);
34
35		impl core::fmt::Display for Error {
36	0	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
37	0	write!(f, "{}", self.0)
38	0	}
39		}
40
41		impl core::error::Error for Error {}
42
43		/// Holds metadata about the field that is being published.
44		#[derive(Debug, Default, Clone)]
45		pub struct MetricFieldData<'a> {
46		pub name: Cow<'a, str>,
47		pub help: Cow<'a, str>,
48		pub group: Cow<'a, str>,
49		}
50
51		/// The final primitive data that is being published with the kind.
52		#[derive(Debug)]
53		pub enum MetricPublishKnownKindData {
54		Counter(u64),
55		String(String),
56		Component,
57		}
58
59		/// The kind of metric that is being published.
60		// Note: This enum will be translate in-and-out
61		// of a u64 when traversing the `tracing::event`
62		// boundary for efficiency reasons.
63		#[derive(Clone, Copy, Debug)]
64		#[repr(u8)]
65		pub enum MetricKind {
66		Default = 0,
67		Counter = 1,
68		String = 2,
69		Component = 3,
70		}
71
72		impl From<u64> for MetricKind {
73	0	fn from(value: u64) -> Self {
74	0	match value {
75	0	0 \| 4_u64..=u64::MAX => Self::Default,
76	0	1 => Self::Counter,
77	0	2 => Self::String,
78	0	3 => Self::Component,
79		}
80	0	}
81		}
82
83		impl MetricKind {
84		#[must_use]
85	0	pub fn into_known_kind(&self, default_kind: Self) -> MetricPublishKnownKindData {
86	0	let this = if matches!(self, Self::Default) {
87	0	default_kind
88		} else {
89	0	*self
90		};
91	0	match this {
92	0	Self::Counter => MetricPublishKnownKindData::Counter(0),
93	0	Self::String => MetricPublishKnownKindData::String(String::new()),
94	0	Self::Component => MetricPublishKnownKindData::Component,
95	0	Self::Default => unreachable!("Default should have been handled"),
96		}
97	0	}
98		}
99
100		/// The trait that all components that can be published must implement.
101		pub trait MetricsComponent {
102		/// # Errors
103		///
104		/// Will return `Err` if we can't publish the metric.
105		fn publish(
106		&self,
107		kind: MetricKind,
108		_field_metadata: MetricFieldData,
109		) -> Result<MetricPublishKnownKindData, Error>;
110		}
111
112		pub trait RootMetricsComponent: MetricsComponent + Send + Sync {
113		/// # Errors
114		///
115		/// Will return `Err` if we can't publish the metric.
116	0	fn publish(
117	0	&self,
118	0	kind: MetricKind,
119	0	field_metadata: MetricFieldData,
120	0	) -> Result<MetricPublishKnownKindData, Error> {
121	0	MetricsComponent::publish(self, kind, field_metadata)
122	0	}
123		}
124
125		impl<T: MetricsComponent> MetricsComponent for Option<T> {
126	0	fn publish(
127	0	&self,
128	0	kind: MetricKind,
129	0	field_metadata: MetricFieldData,
130	0	) -> Result<MetricPublishKnownKindData, Error> {
131	0	self.as_ref()
132	0	.map_or(Ok(MetricPublishKnownKindData::Component), \|value\| {
133	0	value.publish(kind, field_metadata)
134	0	})
135	0	}
136		}
137
138		impl<T: MetricsComponent> MetricsComponent for tokio::sync::watch::Sender<T> {
139	0	fn publish(
140	0	&self,
141	0	kind: MetricKind,
142	0	field_metadata: MetricFieldData,
143	0	) -> Result<MetricPublishKnownKindData, Error> {
144	0	self.borrow().publish(kind, field_metadata)
145	0	}
146		}
147
148		impl<T: MetricsComponent + ?Sized> MetricsComponent for Arc<T> {
149	0	fn publish(
150	0	&self,
151	0	kind: MetricKind,
152	0	field_metadata: MetricFieldData,
153	0	) -> Result<MetricPublishKnownKindData, Error> {
154	0	self.as_ref().publish(kind, field_metadata)
155	0	}
156		}
157
158		impl<T: MetricsComponent, S: BuildHasher> MetricsComponent for HashSet<T, S> {
159	0	fn publish(
160	0	&self,
161	0	kind: MetricKind,
162	0	field_metadata: MetricFieldData,
163	0	) -> Result<MetricPublishKnownKindData, Error> {
164	0	for (i, item) in self.iter().enumerate() {
165	0	let guard = group!(i).entered();
166	0	let publish_result = item.publish(kind, field_metadata.clone())?;
167	0	drop(guard);
168	0	match publish_result {
169	0	MetricPublishKnownKindData::Counter(value) => {
170	0	publish!(
171	0	i,
172	0	&value,
173	0	MetricKind::Counter,
174	0	field_metadata.help.to_string()
175		);
176		}
177	0	MetricPublishKnownKindData::String(value) => {
178	0	publish!(
179	0	i,
180	0	&value,
181	0	MetricKind::String,
182	0	field_metadata.help.to_string()
183		);
184		}
185	0	MetricPublishKnownKindData::Component => {}
186		}
187		}
188	0	Ok(MetricPublishKnownKindData::Component)
189	0	}
190		}
191
192		impl<U: ToString, T: MetricsComponent, S: BuildHasher> MetricsComponent for HashMap<U, T, S> {
193	0	fn publish(
194	0	&self,
195	0	kind: MetricKind,
196	0	field_metadata: MetricFieldData,
197	0	) -> Result<MetricPublishKnownKindData, Error> {
198	0	for (key, item) in self {
199	0	let guard = group!(key).entered();
200	0	let publish_result = item.publish(kind, field_metadata.clone())?;
201	0	drop(guard);
202	0	match publish_result {
203	0	MetricPublishKnownKindData::Counter(value) => {
204	0	publish!(
205	0	key,
206	0	&value,
207	0	MetricKind::Counter,
208	0	field_metadata.help.to_string()
209		);
210		}
211	0	MetricPublishKnownKindData::String(value) => {
212	0	publish!(
213	0	key,
214	0	&value,
215	0	MetricKind::String,
216	0	field_metadata.help.to_string()
217		);
218		}
219	0	MetricPublishKnownKindData::Component => {}
220		}
221		}
222	0	Ok(MetricPublishKnownKindData::Component)
223	0	}
224		}
225
226		impl<U: ToString, T: MetricsComponent> MetricsComponent for BTreeMap<U, T> {
227	0	fn publish(
228	0	&self,
229	0	kind: MetricKind,
230	0	field_metadata: MetricFieldData,
231	0	) -> Result<MetricPublishKnownKindData, Error> {
232	0	for (key, item) in self {
233	0	group!(key).in_scope(\|\| item.publish(kind, field_metadata.clone()))?;
234		}
235	0	Ok(MetricPublishKnownKindData::Component)
236	0	}
237		}
238
239		impl<T: MetricsComponent> MetricsComponent for BTreeSet<T> {
240	0	fn publish(
241	0	&self,
242	0	kind: MetricKind,
243	0	field_metadata: MetricFieldData,
244	0	) -> Result<MetricPublishKnownKindData, Error> {
245	0	for (i, item) in self.iter().enumerate() {
246	0	group!(i).in_scope(\|\| item.publish(kind, field_metadata.clone()))?;
247		}
248	0	Ok(MetricPublishKnownKindData::Component)
249	0	}
250		}
251
252		impl<T: MetricsComponent> MetricsComponent for Vec<T> {
253	0	fn publish(
254	0	&self,
255	0	kind: MetricKind,
256	0	field_metadata: MetricFieldData,
257	0	) -> Result<MetricPublishKnownKindData, Error> {
258	0	for (i, item) in self.iter().enumerate() {
259	0	group!(i).in_scope(\|\| item.publish(kind, field_metadata.clone()))?;
260		}
261	0	Ok(MetricPublishKnownKindData::Component)
262	0	}
263		}
264
265		impl<T: MetricsComponent + ?Sized> MetricsComponent for Weak<T> {
266	0	fn publish(
267	0	&self,
268	0	kind: MetricKind,
269	0	field_metadata: MetricFieldData,
270	0	) -> Result<MetricPublishKnownKindData, Error> {
271	0	let Some(this) = self.upgrade() else { Branch (271:13): [Folded - Ignored] Branch (271:13): [True: 0, False: 0] Branch (271:13): [Folded - Ignored]
272	0	return Ok(MetricPublishKnownKindData::Component);
273		};
274	0	this.as_ref().publish(kind, field_metadata)
275	0	}
276		}
277
278		impl<T, E> MetricsComponent for Result<T, E>
279		where
280		T: MetricsComponent,
281		E: MetricsComponent,
282		{
283	0	fn publish(
284	0	&self,
285	0	kind: MetricKind,
286	0	field_metadata: MetricFieldData,
287	0	) -> Result<MetricPublishKnownKindData, Error> {
288	0	match self {
289	0	Ok(value) => value.publish(kind, field_metadata),
290	0	Err(value) => value.publish(kind, field_metadata),
291		}
292	0	}
293		}
294
295		impl MetricsComponent for Duration {
296	0	fn publish(
297	0	&self,
298	0	kind: MetricKind,
299	0	field_metadata: MetricFieldData,
300	0	) -> Result<MetricPublishKnownKindData, Error> {
301	0	self.as_secs_f64().publish(kind, field_metadata)
302	0	}
303		}
304
305		impl MetricsComponent for SystemTime {
306	0	fn publish(
307	0	&self,
308	0	kind: MetricKind,
309	0	field_metadata: MetricFieldData,
310	0	) -> Result<MetricPublishKnownKindData, Error> {
311	0	Self::now().duration_since(UNIX_EPOCH).map_or_else(
312	0	\|_\| Err(Error("SystemTime before UNIX EPOCH!".to_string())),
313	0	\|n\| n.as_secs().publish(kind, field_metadata),
314		)
315	0	}
316		}
317
318		impl MetricsComponent for f64 {
319	0	fn publish(
320	0	&self,
321	0	_kind: MetricKind,
322	0	_field_metadata: MetricFieldData,
323	0	) -> Result<MetricPublishKnownKindData, Error> {
324	0	Ok(MetricPublishKnownKindData::String(self.to_string()))
325	0	}
326		}
327
328		impl MetricsComponent for bool {
329	0	fn publish(
330	0	&self,
331	0	kind: MetricKind,
332	0	field_metadata: MetricFieldData,
333	0	) -> Result<MetricPublishKnownKindData, Error> {
334	0	let value = u64::from(*self);
335	0	value.publish(kind, field_metadata)
336	0	}
337		}
338
339		impl MetricsComponent for i32 {
340	0	fn publish(
341	0	&self,
342	0	kind: MetricKind,
343	0	field_metadata: MetricFieldData,
344	0	) -> Result<MetricPublishKnownKindData, Error> {
345	0	let value = u64::try_from(*self)
346	0	.map_err(\|_\| Error(format!("Could not convert {self} to u64 in metrics lib")))?;
347	0	value.publish(kind, field_metadata)
348	0	}
349		}
350
351		impl MetricsComponent for u64 {
352	0	fn publish(
353	0	&self,
354	0	kind: MetricKind,
355	0	_field_metadata: MetricFieldData,
356	0	) -> Result<MetricPublishKnownKindData, Error> {
357	0	let mut known_kind_data = kind.into_known_kind(MetricKind::Counter);
358	0	match &mut known_kind_data {
359	0	MetricPublishKnownKindData::Counter(data) => {
360	0	data = self;
361	0	}
362	0	MetricPublishKnownKindData::String(data) => {
363	0	*data = self.to_string();
364	0	}
365	0	MetricPublishKnownKindData::Component => {}
366		}
367	0	Ok(known_kind_data)
368	0	}
369		}
370
371		impl MetricsComponent for i64 {
372	0	fn publish(
373	0	&self,
374	0	kind: MetricKind,
375	0	field_metadata: MetricFieldData,
376	0	) -> Result<MetricPublishKnownKindData, Error> {
377	0	let value = u64::try_from(*self)
378	0	.map_err(\|_\| Error(format!("Could not convert {self} to u64 in metrics lib")))?;
379	0	value.publish(kind, field_metadata)
380	0	}
381		}
382
383		impl MetricsComponent for u32 {
384	0	fn publish(
385	0	&self,
386	0	kind: MetricKind,
387	0	field_metadata: MetricFieldData,
388	0	) -> Result<MetricPublishKnownKindData, Error> {
389	0	u64::from(*self).publish(kind, field_metadata)
390	0	}
391		}
392
393		impl MetricsComponent for usize {
394	0	fn publish(
395	0	&self,
396	0	kind: MetricKind,
397	0	field_metadata: MetricFieldData,
398	0	) -> Result<MetricPublishKnownKindData, Error> {
399	0	let value = u64::try_from(*self)
400	0	.map_err(\|_\| Error(format!("Could not convert {self} to u64 in metrics lib")))?;
401	0	value.publish(kind, field_metadata)
402	0	}
403		}
404
405		impl MetricsComponent for AtomicU64 {
406	0	fn publish(
407	0	&self,
408	0	kind: MetricKind,
409	0	field_metadata: MetricFieldData,
410	0	) -> Result<MetricPublishKnownKindData, Error> {
411	0	self.load(Ordering::Acquire).publish(kind, field_metadata)
412	0	}
413		}
414
415		impl MetricsComponent for AtomicI64 {
416	0	fn publish(
417	0	&self,
418	0	kind: MetricKind,
419	0	field_metadata: MetricFieldData,
420	0	) -> Result<MetricPublishKnownKindData, Error> {
421	0	self.load(Ordering::Acquire).publish(kind, field_metadata)
422	0	}
423		}
424
425		impl MetricsComponent for String {
426	0	fn publish(
427	0	&self,
428	0	kind: MetricKind,
429	0	_field_metadata: MetricFieldData,
430	0	) -> Result<MetricPublishKnownKindData, Error> {
431	0	let mut known_kind_data = kind.into_known_kind(MetricKind::String);
432	0	match &mut known_kind_data {
433	0	MetricPublishKnownKindData::Counter(data) => {
434	0	*data = self.parse::<u64>().map_err(\|_\| {
435	0	Error(format!(
436	0	"Could not convert String '{self}' to u64 in metrics lib"
437	0	))
438	0	})?;
439		}
440	0	MetricPublishKnownKindData::String(data) => {
441	0	data.clone_from(self);
442	0	}
443	0	MetricPublishKnownKindData::Component => {}
444		}
445	0	Ok(known_kind_data)
446	0	}
447		}
448
449		impl<T: MetricsComponent> MetricsComponent for async_lock::Mutex<T> {
450	0	fn publish(
451	0	&self,
452	0	kind: MetricKind,
453	0	field_metadata: MetricFieldData,
454	0	) -> Result<MetricPublishKnownKindData, Error> {
455		// It is safe to block in the publishing thread.
456	0	let lock = self.lock_blocking();
457	0	lock.publish(kind, field_metadata)
458	0	}
459		}
460
461		impl<T: MetricsComponent> MetricsComponent for parking_lot::Mutex<T> {
462	0	fn publish(
463	0	&self,
464	0	kind: MetricKind,
465	0	field_metadata: MetricFieldData,
466	0	) -> Result<MetricPublishKnownKindData, Error> {
467		// It is safe to block in the publishing thread.
468	0	let lock = self.lock();
469	0	lock.publish(kind, field_metadata)
470	0	}
471		}
472
473		impl<T: MetricsComponent> MetricsComponent for parking_lot::RwLock<T> {
474	0	fn publish(
475	0	&self,
476	0	kind: MetricKind,
477	0	field_metadata: MetricFieldData,
478	0	) -> Result<MetricPublishKnownKindData, Error> {
479		// It is safe to block in the publishing thread.
480	0	let lock = self.read();
481	0	lock.publish(kind, field_metadata)
482	0	}
483		}
484
485		#[macro_export]
486		macro_rules! group {
487		($name:expr) => {
488		$crate::__metric_info_span!(target: "nativelink_metric", "", __name = $name.to_string())
489		};
490		}
491
492		#[macro_export]
493		macro_rules! publish {
494		($name:expr, $value:expr, $metric_kind:expr, $help:expr) => {
495		$crate::publish!($name, $value, $metric_kind, $help, "")
496		};
497		($name:expr, $value:expr, $metric_kind:expr, $help:expr, $group:expr) => {
498		{
499		let _maybe_entered = if !$group.is_empty() {
500		Some($crate::group!($group).entered())
501		} else {
502		None
503		};
504		let name = $name.to_string();
505		let field_metadata = $crate::MetricFieldData {
506		name: ::std::borrow::Cow::Borrowed(&name),
507		help: $help.into(),
508		group: $group.into(),
509		};
510		match $crate::MetricsComponent::publish($value, $metric_kind, field_metadata)? {
511		$crate::MetricPublishKnownKindData::Counter(value) => {
512		$crate::__metric_info!(
513		target: "nativelink_metric",
514		__value = value,
515		__type = $crate::MetricKind::Counter as u8,
516		__help = $help.to_string(),
517		__name = name
518		);
519		}
520		$crate::MetricPublishKnownKindData::String(value) => {
521		$crate::__metric_info!(
522		target: "nativelink_metric",
523		__value = value,
524		__type = $crate::MetricKind::String as u8,
525		__help = $help.to_string(),
526		__name = name
527		);
528		}
529		$crate::MetricPublishKnownKindData::Component => {
530		// Do nothing, data already published.
531		}
532		}
533		}
534		};
535		}