Provide Dapr health check

[tomkerkhove]

What would you like to be added:
Provide Dapr health check to determine if it can talk to the sidecar.

Why is this needed:
To ensure that the integration is setup correctly and that the sidecar is reachable & up.

[dmytrohridin]

I can take it, when the new version with dapr/dotnet-sdk#662 will be released

[tomkerkhove]

Thanks @dmytrohridin !

[bgelens]

I'm using this atm

public class DaprHealthCheck : IHealthCheck
{
  private readonly DaprClient _daprClient;

  public DaprHealthCheck(DaprClient daprClient)
  {
    _daprClient = daprClient ?? throw new System.ArgumentNullException(nameof(daprClient));
  }

  public async Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
  {
    return await _daprClient.CheckHealthAsync(cancellationToken)
      ? new HealthCheckResult(HealthStatus.Healthy, "Dapr Sidecar is healthy")
      : new HealthCheckResult(HealthStatus.Unhealthy, "Dapr Sidecar is unhealthy");
  }
}

@dmytrohridin Are you still planning on contributing? If not, I might take a shot at it

[dmytrohridin]

@bgelens feel free