SEEN/backend/internal/repositories/postgres/pool.go

package postgres

import (
	"context"
	"fmt"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/tdvorak/seen/backend/internal/config"
	"go.uber.org/zap"
)

func NewPool(ctx context.Context, cfg config.PostgresConfig, log *zap.Logger) (*pgxpool.Pool, error) {
	poolConfig, err := pgxpool.ParseConfig(cfg.URL)
	if err != nil {
		return nil, fmt.Errorf("parse postgres url: %w", err)
	}

	poolConfig.MaxConns = cfg.MaxConns
	poolConfig.MinConns = cfg.MinConns
	poolConfig.MaxConnIdleTime = 5 * time.Minute
	poolConfig.HealthCheckPeriod = 30 * time.Second

	pool, err := pgxpool.NewWithConfig(ctx, poolConfig)
	if err != nil {
		return nil, fmt.Errorf("connect postgres: %w", err)
	}

	if err := pool.Ping(ctx); err != nil {
		pool.Close()
		return nil, fmt.Errorf("ping postgres: %w", err)
	}

	log.Info("postgres connected", zap.Int32("max_conns", cfg.MaxConns), zap.Int32("min_conns", cfg.MinConns))

	return pool, nil
}