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|
use std::path::PathBuf;
use std::time::Instant;
use crate::lmdb_adapter::{LmdbDb, LmdbTx};
use crate::{Bound, IDb, ITx, ITxFn, OnCommit, Result, TxResult, Value, ValueIter};
use opentelemetry::{
global,
metrics::{Counter, ValueRecorder},
KeyValue,
};
pub struct MetricDbProxy {
db: LmdbDb,
op_counter: Counter<u64>,
op_duration: ValueRecorder<f64>,
}
impl MetricDbProxy {
pub fn init(db: LmdbDb) -> MetricDbProxy {
let meter = global::meter("garage/web");
Self {
db,
op_counter: meter
.u64_counter("db.op_counter")
.with_description("Number of operations on the local metadata engine")
.init(),
op_duration: meter
.f64_value_recorder("db.op_duration")
.with_description("Duration of operations on the local metadata engine")
.init(),
}
}
fn instrument<T>(
&self,
fx: impl FnOnce() -> T,
op: &'static str,
cat: &'static str,
tx: &'static str,
) -> T {
let metric_tags = [
KeyValue::new("op", op),
KeyValue::new("cat", cat),
KeyValue::new("tx", tx),
];
self.op_counter.add(1, &metric_tags);
let request_start = Instant::now();
let res = fx();
self.op_duration.record(
Instant::now()
.saturating_duration_since(request_start)
.as_secs_f64(),
&metric_tags,
);
res
}
}
impl IDb for MetricDbProxy {
fn engine(&self) -> String {
format!("Metric Proxy on {}", self.db.engine())
}
fn open_tree(&self, name: &str) -> Result<usize> {
self.instrument(|| self.db.open_tree(name), "open_tree", "control", "no")
}
fn list_trees(&self) -> Result<Vec<String>> {
self.instrument(|| self.db.list_trees(), "list_trees", "control", "no")
}
fn snapshot(&self, to: &PathBuf) -> Result<()> {
self.instrument(|| self.db.snapshot(to), "snapshot", "control", "no")
}
// ---
fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
self.instrument(|| self.db.get(tree, key), "get", "data", "no")
}
fn len(&self, tree: usize) -> Result<usize> {
self.instrument(|| self.db.len(tree), "len", "data", "no")
}
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
self.instrument(|| self.db.insert(tree, key, value), "insert", "data", "no")
}
fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
self.instrument(|| self.db.remove(tree, key), "remove", "data", "no")
}
fn clear(&self, tree: usize) -> Result<()> {
self.instrument(|| self.db.clear(tree), "clear", "data", "no")
}
fn iter(&self, tree: usize) -> Result<ValueIter<'_>> {
self.instrument(|| self.db.iter(tree), "iter", "data", "no")
}
fn iter_rev(&self, tree: usize) -> Result<ValueIter<'_>> {
self.instrument(|| self.db.iter_rev(tree), "iter_rev", "data", "no")
}
fn range<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
self.instrument(|| self.db.range(tree, low, high), "range", "data", "no")
}
fn range_rev<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
self.instrument(
|| self.db.range_rev(tree, low, high),
"range_rev",
"data",
"no",
)
}
// ----
fn transaction(&self, f: &dyn ITxFn) -> TxResult<OnCommit, ()> {
self.instrument(|| self.db.transaction(f), "transaction", "control", "yes")
}
}
struct MetricTxProxy<'a> {
tx: LmdbTx<'a>,
}
|
