import sys

import numpy as np
import pytest

import ray
from ray._private.test_utils import get_other_nodes


@pytest.mark.parametrize(
    "ray_start_cluster",
    [{"num_cpus": 4, "num_nodes": 3, "do_init": True}],
    indirect=True,
)
def test_actor_creation_node_failure(ray_start_cluster):
    # TODO(swang): Refactor test_raylet_failed, etc to reuse the below code.
    cluster = ray_start_cluster

    @ray.remote
    class Child:
        def __init__(self, death_probability):
            self.death_probability = death_probability

        def ping(self):
            # Exit process with some probability.
            exit_chance = np.random.rand()
            if exit_chance < self.death_probability:
                sys.exit(-1)

    num_children = 25
    # Children actors will die about half the time.
    death_probability = 0.5

    children = [Child.remote(death_probability) for _ in range(num_children)]
    while len(cluster.list_all_nodes()) > 1:
        for j in range(2):
            # Submit some tasks on the actors. About half of the actors will
            # fail.
            children_out = [child.ping.remote() for child in children]
            # Wait a while for all the tasks to complete. This should trigger
            # reconstruction for any actor creation tasks that were forwarded
            # to nodes that then failed.
            ready, _ = ray.wait(
                children_out, num_returns=len(children_out), timeout=5 * 60.0
            )
            assert len(ready) == len(children_out)

            # Replace any actors that died.
            for i, out in enumerate(children_out):
                try:
                    ray.get(out)
                except ray.exceptions.RayActorError:
                    children[i] = Child.remote(death_probability)
        # Remove a node. Any actor creation tasks that were forwarded to this
        # node must be resubmitted.
        cluster.remove_node(get_other_nodes(cluster, True)[-1])


if __name__ == "__main__":
    sys.exit(pytest.main(["-sv", __file__]))