open 1 conn at a time

cmd/pg-pulse/main.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"sync"
 	"time"
 
 	"gitea.bel.blue/bel/with"
@@ -30,14 +31,20 @@ func run(ctx context.Context) error {
 	}
 
 	for i := 0; i < *p-1; i++ {
-		go with.PSQL(ctx, *c, func(pg *sql.DB) error {
+		func() {
-			with.GoEvery(ctx, *d, func() {
+			connected := &sync.WaitGroup{}
-				if _, err := pg.ExecContext(ctx, `SELECT 1`); err != nil {
+			connected.Add(1)
-					log.Println("!", err)
+			go with.PSQL(ctx, *c, func(pg *sql.DB) error {
-				}
+				connected.Done()
+				with.GoEvery(ctx, *d, func() {
+					if _, err := pg.ExecContext(ctx, `SELECT 1`); err != nil {
+						log.Println("!", err)
+					}
+				})
+				return ctx.Err()
 			})
-			return ctx.Err()
+			connected.Wait()
-		})
+		}()
 	}
 
 	return with.PSQL(ctx, *c, func(pg *sql.DB) error {