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Track pg and redis get conn metrics.

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This data is useful when debugging connection-pool size related issues.
E.g. when more connections are requested than the connection pool allows
then this will result in a longer wait time.
This commit is contained in:
Orne Brocaar 2024-01-31 09:54:00 +00:00
parent 107fbfa7bb
commit 9de86ffdec
1 changed files with 35 additions and 3 deletions
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38
chirpstack/src/storage/mod.rs
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@ -1,4 +1,5 @@
use std::sync::RwLock;
use std::time::Instant;
use anyhow::Result;
use diesel::{ConnectionError, ConnectionResult};
@ -9,6 +10,7 @@ use diesel_async::AsyncPgConnection;
use diesel_migrations::{embed_migrations, EmbeddedMigrations, MigrationHarness};
use futures_util::future::BoxFuture;
use futures_util::FutureExt;
use prometheus_client::metrics::histogram::{exponential_buckets, Histogram};
use redis::aio::ConnectionLike;
use tokio::sync::RwLock as TokioRwLock;
use tokio::task;
@ -41,6 +43,7 @@ pub mod tenant;
pub mod user;
use crate::helpers::tls::get_root_certs;
use crate::monitoring::prometheus;
pub type AsyncPgPool = DeadpoolPool<AsyncPgConnection>;
pub type AsyncPgPoolConnection = DeadpoolObject<AsyncPgConnection>;
@ -49,6 +52,24 @@ lazy_static! {
static ref ASYNC_PG_POOL: RwLock<Option<AsyncPgPool>> = RwLock::new(None);
static ref ASYNC_REDIS_POOL: TokioRwLock<Option<AsyncRedisPool>> = TokioRwLock::new(None);
static ref REDIS_PREFIX: RwLock<String> = RwLock::new("".to_string());
static ref STORAGE_REDIS_CONN_GET: Histogram = {
let histogram = Histogram::new(exponential_buckets(0.001, 2.0, 12));
prometheus::register(
"storage_redis_conn_get_duration_seconds",
"Time between requesting a Redis connection and the connection-pool returning it",
histogram.clone(),
);
histogram
};
static ref STORAGE_PG_CONN_GET: Histogram = {
let histogram = Histogram::new(exponential_buckets(0.001, 2.0, 12));
prometheus::register(
"storage_pg_conn_get_duration_seconds",
"Time between requesting a PostgreSQL connection and the connection-pool returning it",
histogram.clone(),
);
histogram
};
}
pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!("./migrations");
@ -174,7 +195,13 @@ pub fn get_async_db_pool() -> Result<AsyncPgPool> {
pub async fn get_async_db_conn() -> Result<AsyncPgPoolConnection> {
let pool = get_async_db_pool()?;
Ok(pool.get().await?)
let start = Instant::now();
let res = pool.get().await?;
STORAGE_PG_CONN_GET.observe(start.elapsed().as_secs_f64());
Ok(res)
}
async fn get_async_redis_pool() -> Result<AsyncRedisPool> {
@ -189,12 +216,17 @@ async fn get_async_redis_pool() -> Result<AsyncRedisPool> {
pub async fn get_async_redis_conn() -> Result<AsyncRedisPoolConnection> {
let pool = get_async_redis_pool().await?;
Ok(match pool {
let start = Instant::now();
let res = match pool {
AsyncRedisPool::Client(v) => AsyncRedisPoolConnection::Client(v.get().await?),
AsyncRedisPool::ClusterClient(v) => {
AsyncRedisPoolConnection::ClusterClient(v.clone().get().await?)
}
})
};
STORAGE_REDIS_CONN_GET.observe(start.elapsed().as_secs_f64());
Ok(res)
}
pub fn set_async_db_pool(p: AsyncPgPool) {