casper-node 0.6.3

The Casper blockchain node
Documentation 
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use datasize::DataSize;
use prometheus::{self, IntGauge, Registry};

/// Metrics for the block proposer.
#[derive(DataSize, Debug, Clone)]
pub struct BlockProposerMetrics {
    /// Amount of pending deploys
    #[data_size(skip)]
    pub(super) pending_deploys: IntGauge,
    /// Registry stored to allow deregistration later.
    #[data_size(skip)]
    registry: Registry,
}

impl BlockProposerMetrics {
    /// Creates a new instance of the block proposer metrics.
    pub fn new(registry: Registry) -> Result<Self, prometheus::Error> {
        let pending_deploys = IntGauge::new("pending_deploy", "amount of pending deploys")?;
        registry.register(Box::new(pending_deploys.clone()))?;
        Ok(BlockProposerMetrics {
            pending_deploys,
            registry,
        })
    }
}

impl Drop for BlockProposerMetrics {
    fn drop(&mut self) {
        self.registry
            .unregister(Box::new(self.pending_deploys.clone()))
            .expect("did not expect deregistering pending_deploys to fail");
    }
}