GmRelayBot/src/GmRelay.Web/Health/NpgsqlHealthCheck.cs

using Microsoft.Extensions.Diagnostics.HealthChecks;
using Npgsql;

namespace GmRelay.Web.Health;

public sealed class NpgsqlHealthCheck(NpgsqlDataSource dataSource) : IHealthCheck
{
    public async Task<HealthCheckResult> CheckHealthAsync(
        HealthCheckContext context,
        CancellationToken cancellationToken = default)
    {
        try
        {
            await using var connection = await dataSource.OpenConnectionAsync(cancellationToken);
            await using var command = connection.CreateCommand();
            command.CommandText = "SELECT 1";
            await command.ExecuteScalarAsync(cancellationToken);
            return HealthCheckResult.Healthy();
        }
        catch (Exception ex)
        {
            return HealthCheckResult.Unhealthy("PostgreSQL is unavailable", ex);
        }
    }
}