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use core::fmt;
use std::any::Any;
use std::borrow::Cow;
use std::sync::Arc;
use crate::metrics::{
AsyncInstrumentBuilder, Counter, Gauge, Histogram, InstrumentBuilder, InstrumentProvider,
ObservableCounter, ObservableGauge, ObservableUpDownCounter, Result, UpDownCounter,
};
use crate::KeyValue;
use super::AsyncInstrument;
/// Provides access to named [Meter] instances, for instrumenting an application
/// or crate.
pub trait MeterProvider {
/// Returns a new [Meter] with the provided name and default configuration.
///
/// A [Meter] should be scoped at most to a single application or crate. The
/// name needs to be unique so it does not collide with other names used by
/// an application, nor other applications.
///
/// If the name is empty, then an implementation defined default name will
/// be used instead.
///
/// # Examples
///
/// ```
/// use opentelemetry::{global, metrics::MeterProvider};
/// use opentelemetry::KeyValue;
///
/// let provider = global::meter_provider();
///
/// // meter used in applications
/// let meter = provider.meter("my_app");
///
/// // meter used in libraries/crates that optionally includes version and schema url
/// let meter = provider.versioned_meter(
/// "my_library",
/// Some(env!("CARGO_PKG_VERSION")),
/// Some("https://opentelemetry.io/schema/1.0.0"),
/// Some(vec![KeyValue::new("key", "value")]),
/// );
/// ```
fn meter(&self, name: impl Into<Cow<'static, str>>) -> Meter {
self.versioned_meter(
name,
None::<Cow<'static, str>>,
None::<Cow<'static, str>>,
None,
)
}
/// Returns a new versioned meter with a given name.
///
/// The instrumentation name must be the name of the library providing instrumentation. This
/// name may be the same as the instrumented code only if that code provides built-in
/// instrumentation. If the instrumentation name is empty, then a implementation defined
/// default name will be used instead.
fn versioned_meter(
&self,
name: impl Into<Cow<'static, str>>,
version: Option<impl Into<Cow<'static, str>>>,
schema_url: Option<impl Into<Cow<'static, str>>>,
attributes: Option<Vec<KeyValue>>,
) -> Meter;
}
/// Provides access to instrument instances for recording measurements.
///
/// ```
/// use opentelemetry::{global, KeyValue};
///
/// let meter = global::meter("my-meter");
///
/// // Meters can create metric instruments that can record values of type u64 and f64
///
/// // u64 Counter
/// let u64_counter = meter.u64_counter("my_u64_counter").init();
///
/// // Record measurements using the counter instrument add()
/// u64_counter.add(
/// 10,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ]
/// );
///
/// // f64 Counter
/// let f64_counter = meter.f64_counter("my_f64_counter").init();
///
/// // Record measurements using the counter instrument add()
/// f64_counter.add(
/// 3.15,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // u6 observable counter
/// let observable_u4_counter = meter.u64_observable_counter("my_observable_u64_counter").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[observable_u4_counter.as_any()], move |observer| {
/// observer.observe_u64(
/// &observable_u4_counter,
/// 1,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // f64 observable counter
/// let observable_f64_counter = meter.f64_observable_counter("my_observable_f64_counter").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[observable_f64_counter.as_any()], move |observer| {
/// observer.observe_f64(
/// &observable_f64_counter,
/// 1.55,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // i64 updown counter
/// let updown_i64_counter = meter.i64_up_down_counter("my_updown_i64_counter").init();
///
/// // Record measurements using the updown counter instrument add()
/// updown_i64_counter.add(
/// -10,
/// &
/// [
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // f64 updown counter
/// let updown_f64_counter = meter.f64_up_down_counter("my_updown_f64_counter").init();
///
/// // Record measurements using the updown counter instrument add()
/// updown_f64_counter.add(
/// -10.67,
/// &
/// [
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // i64 observable updown counter
/// let observable_i64_up_down_counter = meter.i64_observable_up_down_counter("my_observable_i64_updown_counter").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[observable_i64_up_down_counter.as_any()], move |observer| {
/// observer.observe_i64(
/// &observable_i64_up_down_counter,
/// 1,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // f64 observable updown counter
/// let observable_f64_up_down_counter = meter.f64_observable_up_down_counter("my_observable_f64_updown_counter").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[observable_f64_up_down_counter.as_any()], move |observer| {
/// observer.observe_f64(
/// &observable_f64_up_down_counter,
/// 1.16,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // Observable f64 gauge
/// let f64_gauge = meter.f64_observable_gauge("my_f64_gauge").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[f64_gauge.as_any()], move |observer| {
/// observer.observe_f64(
/// &f64_gauge,
/// 2.32,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // Observable i64 gauge
/// let i64_gauge = meter.i64_observable_gauge("my_i64_gauge").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[i64_gauge.as_any()], move |observer| {
/// observer.observe_i64(
/// &i64_gauge,
/// 12,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // Observable u64 gauge
/// let u64_gauge = meter.u64_observable_gauge("my_u64_gauge").init();
///
/// // Register a callback to this meter for an asynchronous instrument to record measurements
/// meter.register_callback(&[u64_gauge.as_any()], move |observer| {
/// observer.observe_u64(
/// &u64_gauge,
/// 1,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// });
///
/// // f64 histogram
/// let f64_histogram = meter.f64_histogram("my_f64_histogram").init();
///
/// // Record measurements using the histogram instrument record()
/// f64_histogram.record(
/// 10.5,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // u64 histogram
/// let u64_histogram = meter.u64_histogram("my_u64_histogram").init();
///
/// // Record measurements using the histogram instrument record()
/// u64_histogram.record(
/// 12,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// ```
#[derive(Clone)]
pub struct Meter {
pub(crate) instrument_provider: Arc<dyn InstrumentProvider + Send + Sync>,
}
impl Meter {
/// Create a new named meter from an instrumentation provider
#[doc(hidden)]
pub fn new(instrument_provider: Arc<dyn InstrumentProvider + Send + Sync>) -> Self {
Meter {
instrument_provider,
}
}
/// creates an instrument builder for recording increasing values.
pub fn u64_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Counter<u64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording increasing values.
pub fn f64_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Counter<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording increasing values via callback.
pub fn u64_observable_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableCounter<u64>, u64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording increasing values via callback.
pub fn f64_observable_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableCounter<f64>, f64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value.
pub fn i64_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, UpDownCounter<i64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value.
pub fn f64_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, UpDownCounter<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value via callback.
pub fn i64_observable_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableUpDownCounter<i64>, i64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value via callback.
pub fn f64_observable_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableUpDownCounter<f64>, f64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording independent values.
pub fn u64_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Gauge<u64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording independent values.
pub fn f64_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Gauge<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording independent values.
pub fn i64_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Gauge<i64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording the current value via callback.
pub fn u64_observable_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableGauge<u64>, u64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording the current value via callback.
pub fn i64_observable_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableGauge<i64>, i64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording the current value via callback.
pub fn f64_observable_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableGauge<f64>, f64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording a distribution of values.
pub fn f64_histogram(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Histogram<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording a distribution of values.
pub fn u64_histogram(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Histogram<u64>> {
InstrumentBuilder::new(self, name.into())
}
/// Registers a callback to be called during the collection of a measurement
/// cycle.
///
/// The instruments passed as arguments to be registered are the only
/// instruments that may observe values.
///
/// If no instruments are passed, the callback will not be registered.
pub fn register_callback<F>(
&self,
instruments: &[Arc<dyn Any>],
callback: F,
) -> Result<Box<dyn CallbackRegistration>>
where
F: Fn(&dyn Observer) + Send + Sync + 'static,
{
self.instrument_provider
.register_callback(instruments, Box::new(callback))
}
}
/// A token representing the unique registration of a callback for a set of
/// instruments with a [Meter].
pub trait CallbackRegistration: Send + Sync {
/// Removes the callback registration from its associated [Meter].
fn unregister(&mut self) -> Result<()>;
}
/// Records measurements for multiple instruments in a callback.
pub trait Observer {
/// Records the f64 value with attributes for the observable.
fn observe_f64(&self, inst: &dyn AsyncInstrument<f64>, measurement: f64, attrs: &[KeyValue]);
/// Records the u64 value with attributes for the observable.
fn observe_u64(&self, inst: &dyn AsyncInstrument<u64>, measurement: u64, attrs: &[KeyValue]);
/// Records the i64 value with attributes for the observable.
fn observe_i64(&self, inst: &dyn AsyncInstrument<i64>, measurement: i64, attrs: &[KeyValue]);
}
impl fmt::Debug for Meter {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Meter")
}
}