hrynco-common/HrynCo.Common/HealthChecks/BaseConfigurationCheck.cs

namespace HrynCo.Common.HealthChecks;

using System.ComponentModel.DataAnnotations;
using HrynCo.Common.HealthChecks.Interfaces;
using Microsoft.Extensions.Diagnostics.HealthChecks;

public abstract class BaseConfigurationCheck<TOptions> : IConfigurationCheck
    where TOptions : class
{
    private readonly string _name;
    private readonly TOptions _options;

    protected BaseConfigurationCheck(TOptions options, string name)
    {
        _options = options;
        _name = name;
    }

    public Task<HealthCheckResult> CheckConfigurationAsync(CancellationToken cancellationToken)
    {
        var context = new ValidationContext(_options);
        var results = new List<ValidationResult>();

        bool isValid = Validator.TryValidateObject(
            _options,
            context,
            results,
            true
        );

        if (!isValid)
        {
            string errors = string.Join("; ", results.Select(r => r.ErrorMessage));
            return Task.FromResult(HealthCheckResult.Unhealthy($"{_name} configuration invalid: {errors}"));
        }

        return Task.FromResult(HealthCheckResult.Healthy($"{_name} configuration is valid."));
    }
}