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The application now has a metrics handler compatible with prometheus. Besides default metrics, database pooling metrics are also shared at the moment.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| package metric | ||
|
|
||
| import ( | ||
| "context" | ||
| "github.com/jackc/pgx/v5/pgxpool" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| "time" | ||
| ) | ||
|
|
||
| var dbConnAcquired = promauto.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "dbpool_acquired_connections", | ||
| Help: "Number of connections currently acquired.", | ||
| }) | ||
| var dbConnIdle = promauto.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "dbpool_idle_connections", | ||
| Help: "Number of idle connections currently idle.", | ||
| }) | ||
| var dbConnConstructing = promauto.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "dbpool_constructing_connections", | ||
| Help: "Number of connections being constructed.", | ||
| }) | ||
| var dbMaxConns = promauto.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "dbpool_max_connections", | ||
| Help: "Maximum amount of connections permitted.", | ||
| }) | ||
|
|
||
| func updateDbPool(pool *pgxpool.Pool) { | ||
| stat := pool.Stat() | ||
| dbConnAcquired.Set(float64(stat.AcquiredConns())) | ||
| dbConnIdle.Set(float64(stat.IdleConns())) | ||
| dbConnConstructing.Set(float64(stat.ConstructingConns())) | ||
| dbMaxConns.Set(float64(stat.MaxConns())) | ||
| } | ||
|
|
||
| func WatchDbPool(ctx context.Context, pool *pgxpool.Pool, refresh time.Duration) { | ||
| updateDbPool(pool) | ||
| ticker := time.NewTicker(refresh) | ||
| go func() { | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| updateDbPool(pool) | ||
| case <-ctx.Done(): | ||
| ticker.Stop() | ||
| return | ||
| } | ||
| } | ||
| }() | ||
| } |