hivemind/tests/test_dht_schema.py

import pytest
from pydantic import BaseModel, StrictInt, conint
from typing import Dict

import hivemind
from hivemind.dht import get_dht_time
from hivemind.dht.node import DHTNode, LOCALHOST
from hivemind.dht.schema import BytesWithPublicKey, SchemaValidator
from hivemind.dht.validation import DHTRecord, RecordValidatorBase


class SampleSchema(BaseModel):
    experiment_name: bytes
    n_batches: Dict[bytes, conint(ge=0, strict=True)]
    signed_data: Dict[BytesWithPublicKey, bytes]


@pytest.fixture
async def dht_nodes_with_schema():
    validator = SchemaValidator(SampleSchema)

    alice = await DHTNode.create(record_validator=validator)
    bob = await DHTNode.create(
        record_validator=validator, initial_peers=[f"{LOCALHOST}:{alice.port}"])
    return alice, bob


@pytest.mark.forked
@pytest.mark.asyncio
async def test_expecting_regular_value(dht_nodes_with_schema):
    alice, bob = dht_nodes_with_schema

    # Regular value (bytes) expected
    assert await bob.store('experiment_name', b'foo_bar', get_dht_time() + 10)
    assert not await bob.store('experiment_name', 666, get_dht_time() + 10)
    assert not await bob.store('experiment_name', b'foo_bar', get_dht_time() + 10,
                               subkey=b'subkey')

    # Refuse records despite https://pydantic-docs.helpmanual.io/usage/models/#data-conversion
    assert not await bob.store('experiment_name', [], get_dht_time() + 10)
    assert not await bob.store('experiment_name', [1, 2, 3], get_dht_time() + 10)

    for peer in [alice, bob]:
        assert (await peer.get('experiment_name', latest=True)).value == b'foo_bar'


@pytest.mark.forked
@pytest.mark.asyncio
async def test_expecting_dictionary(dht_nodes_with_schema):
    alice, bob = dht_nodes_with_schema

    # Dictionary (bytes -> non-negative int) expected
    assert await bob.store('n_batches', 777, get_dht_time() + 10, subkey=b'uid1')
    assert await bob.store('n_batches', 778, get_dht_time() + 10, subkey=b'uid2')
    assert not await bob.store('n_batches', -666, get_dht_time() + 10, subkey=b'uid3')
    assert not await bob.store('n_batches', 666, get_dht_time() + 10)
    assert not await bob.store('n_batches', b'not_integer', get_dht_time() + 10, subkey=b'uid1')
    assert not await bob.store('n_batches', 666, get_dht_time() + 10, subkey=666)

    # Refuse storing a plain dictionary bypassing the DictionaryDHTValue convention
    assert not await bob.store('n_batches', {b'uid3': 779}, get_dht_time() + 10)

    # Refuse records despite https://pydantic-docs.helpmanual.io/usage/models/#data-conversion
    assert not await bob.store('n_batches', 779.5, get_dht_time() + 10, subkey=b'uid3')
    assert not await bob.store('n_batches', 779.0, get_dht_time() + 10, subkey=b'uid3')
    assert not await bob.store('n_batches', [], get_dht_time() + 10)
    assert not await bob.store('n_batches', [(b'uid3', 779)], get_dht_time() + 10)

    # Refuse records despite https://github.com/samuelcolvin/pydantic/issues/1268
    assert not await bob.store('n_batches', '', get_dht_time() + 10)

    for peer in [alice, bob]:
        dictionary = (await peer.get('n_batches', latest=True)).value
        assert (len(dictionary) == 2 and
                dictionary[b'uid1'].value == 777 and
                dictionary[b'uid2'].value == 778)


@pytest.mark.forked
@pytest.mark.asyncio
async def test_expecting_public_keys(dht_nodes_with_schema):
    alice, bob = dht_nodes_with_schema

    # Subkeys expected to contain a public key
    # (so hivemind.dht.crypto.RSASignatureValidator would require a signature)
    assert await bob.store('signed_data', b'foo_bar', get_dht_time() + 10,
                           subkey=b'uid[owner:public-key]')
    assert not await bob.store('signed_data', b'foo_bar', get_dht_time() + 10,
                               subkey=b'uid-without-public-key')

    for peer in [alice, bob]:
        dictionary = (await peer.get('signed_data', latest=True)).value
        assert (len(dictionary) == 1 and
                dictionary[b'uid[owner:public-key]'].value == b'foo_bar')


@pytest.mark.forked
@pytest.mark.asyncio
async def test_keys_outside_schema(dht_nodes_with_schema):
    class Schema(BaseModel):
        some_field: StrictInt

    class MergedSchema(BaseModel):
        another_field: StrictInt

    for allow_extra_keys in [False, True]:
        validator = SchemaValidator(Schema, allow_extra_keys=allow_extra_keys)
        assert validator.merge_with(SchemaValidator(MergedSchema, allow_extra_keys=False))

        alice = await DHTNode.create(record_validator=validator)
        bob = await DHTNode.create(
            record_validator=validator, initial_peers=[f"{LOCALHOST}:{alice.port}"])

        store_ok = await bob.store('unknown_key', b'foo_bar', get_dht_time() + 10)
        assert store_ok == allow_extra_keys

        for peer in [alice, bob]:
            result = await peer.get('unknown_key', latest=True)
            if allow_extra_keys:
                assert result.value == b'foo_bar'
            else:
                assert result is None


@pytest.mark.forked
@pytest.mark.asyncio
async def test_prefix():
    class Schema(BaseModel):
        field: StrictInt

    validator = SchemaValidator(Schema, allow_extra_keys=False, prefix='prefix')

    alice = await DHTNode.create(record_validator=validator)
    bob = await DHTNode.create(
        record_validator=validator, initial_peers=[f"{LOCALHOST}:{alice.port}"])

    assert await bob.store('prefix_field', 777, get_dht_time() + 10)
    assert not await bob.store('prefix_field', 'string_value', get_dht_time() + 10)
    assert not await bob.store('field', 777, get_dht_time() + 10)

    for peer in [alice, bob]:
        assert (await peer.get('prefix_field', latest=True)).value == 777
        assert (await peer.get('field', latest=True)) is None


@pytest.mark.forked
@pytest.mark.asyncio
async def test_merging_schema_validators(dht_nodes_with_schema):
    alice, bob = dht_nodes_with_schema

    class TrivialValidator(RecordValidatorBase):
        def validate(self, record: DHTRecord) -> bool:
            return True

    second_validator = TrivialValidator()
    # Can't merge with the validator of the different type
    assert not alice.protocol.record_validator.merge_with(second_validator)

    class SecondSchema(BaseModel):
        some_field: StrictInt
        another_field: str

    class ThirdSchema(BaseModel):
        another_field: StrictInt  # Allow it to be a StrictInt as well

    for schema in [SecondSchema, ThirdSchema]:
        new_validator = SchemaValidator(schema, allow_extra_keys=False)
        for peer in [alice, bob]:
            assert peer.protocol.record_validator.merge_with(new_validator)

    assert await bob.store('experiment_name', b'foo_bar', get_dht_time() + 10)
    assert await bob.store('some_field', 777, get_dht_time() + 10)
    assert not await bob.store('some_field', 'string_value', get_dht_time() + 10)
    assert await bob.store('another_field', 42, get_dht_time() + 10)
    assert await bob.store('another_field', 'string_value', get_dht_time() + 10)

    # Unknown keys are allowed since the first schema is created with allow_extra_keys=True
    assert await bob.store('unknown_key', 999, get_dht_time() + 10)

    for peer in [alice, bob]:
        assert (await peer.get('experiment_name', latest=True)).value == b'foo_bar'
        assert (await peer.get('some_field', latest=True)).value == 777
        assert (await peer.get('another_field', latest=True)).value == 'string_value'

        assert (await peer.get('unknown_key', latest=True)).value == 999


@pytest.mark.forked
def test_sending_validator_instance_between_processes():
    alice = hivemind.DHT(start=True)
    bob = hivemind.DHT(start=True, initial_peers=[f"{LOCALHOST}:{alice.port}"])

    alice.add_validators([SchemaValidator(SampleSchema)])
    bob.add_validators([SchemaValidator(SampleSchema)])

    assert bob.store('experiment_name', b'foo_bar', get_dht_time() + 10)
    assert not bob.store('experiment_name', 777, get_dht_time() + 10)
    assert alice.get('experiment_name', latest=True).value == b'foo_bar'