metry 0.1.1

All-in-one telemetry framework, based on tracing crate.
Documentation 
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//! [MetricsExporter] and [MetricsClient] interfaces for use with OTEL libraries.

use async_trait::async_trait;
use opentelemetry::metrics::Result;

use opentelemetry_sdk::metrics::{
    data::{ResourceMetrics, Temporality},
    exporter::PushMetricsExporter,
    reader::{AggregationSelector, TemporalitySelector},
    Aggregation, InstrumentKind,
};
use std::fmt::{Debug, Formatter};

/// An interface for a metrics clients
#[async_trait]
pub trait MetricsClient: core::fmt::Debug + Send + Sync + 'static {
    async fn export(&self, metrics: &mut ResourceMetrics) -> Result<()>;
}

/// Exporter for metrics.
pub struct MetricsExporter {
    pub(crate) client: Box<dyn MetricsClient>,
    pub(crate) temporality_selector: Box<dyn TemporalitySelector>,
    pub(crate) aggregation_selector: Box<dyn AggregationSelector>,
}

impl Debug for MetricsExporter {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("MetricsExporter").finish()
    }
}

impl TemporalitySelector for MetricsExporter {
    fn temporality(&self, kind: InstrumentKind) -> Temporality {
        self.temporality_selector.temporality(kind)
    }
}

impl AggregationSelector for MetricsExporter {
    fn aggregation(&self, kind: InstrumentKind) -> Aggregation {
        self.aggregation_selector.aggregation(kind)
    }
}

#[async_trait]
impl PushMetricsExporter for MetricsExporter {
    async fn export(&self, metrics: &mut ResourceMetrics) -> Result<()> {
        self.client.export(metrics).await
    }

    async fn force_flush(&self) -> Result<()> {
        // this component is stateless
        Ok(())
    }

    fn shutdown(&self) -> Result<()> {
        // this component is stateless
        Ok(())
    }
}

impl MetricsExporter {
    /// Create a new metrics exporter
    pub fn new(
        client: impl MetricsClient,
        temporality_selector: Box<dyn TemporalitySelector>,
        aggregation_selector: Box<dyn AggregationSelector>,
    ) -> MetricsExporter {
        MetricsExporter {
            client: Box::new(client),
            temporality_selector,
            aggregation_selector,
        }
    }
}