306 lines
10 KiB
Python
306 lines
10 KiB
Python
from eth2spec.phase0 import spec as spec_phase0
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from eth2spec.phase1 import spec as spec_phase1
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from eth2spec.utils import bls
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from .helpers.genesis import create_genesis_state
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from .utils import vector_test, with_meta_tags
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from random import Random
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from typing import Any, Callable, NewType, Sequence, TypedDict, Protocol
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from lru import LRU
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from importlib import reload
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def reload_specs():
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reload(spec_phase0)
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reload(spec_phase1)
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# Some of the Spec module functionality is exposed here to deal with phase-specific changes.
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SpecForkName = NewType("SpecForkName", str)
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PHASE0 = SpecForkName('phase0')
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PHASE1 = SpecForkName('phase1')
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ALL_PHASES = (PHASE0, PHASE1)
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# TODO: currently phases are defined as python modules.
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# It would be better if they would be more well-defined interfaces for stronger typing.
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class Spec(Protocol):
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version: str
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class SpecPhase0(Spec):
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...
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class SpecPhase1(Spec):
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def upgrade_to_phase1(self, state: spec_phase0.BeaconState) -> spec_phase1.BeaconState:
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...
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# add transfer, bridge, etc. as the spec evolves
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class SpecForks(TypedDict, total=False):
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PHASE0: SpecPhase0
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PHASE1: SpecPhase1
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def _prepare_state(balances_fn: Callable[[Any], Sequence[int]], threshold_fn: Callable[[Any], int],
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spec: Spec, phases: SpecForks):
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p0 = phases[PHASE0]
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balances = balances_fn(p0)
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activation_threshold = threshold_fn(p0)
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state = create_genesis_state(spec=p0, validator_balances=balances,
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activation_threshold=activation_threshold)
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if spec.fork == PHASE1:
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# TODO: instead of upgrading a test phase0 genesis state we can also write a phase1 state helper.
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# Decide based on performance/consistency results later.
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state = phases[PHASE1].upgrade_to_phase1(state)
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# Shard state slot must lag behind BeaconState slot by at least 1
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# Will handle this more elegantly with fork mechanics
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spec.process_slots(state, state.slot + 1)
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return state
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_custom_state_cache_dict = LRU(size=10)
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def with_custom_state(balances_fn: Callable[[Any], Sequence[int]],
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threshold_fn: Callable[[Any], int]):
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def deco(fn):
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def entry(*args, spec: Spec, phases: SpecForks, **kw):
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# make a key for the state
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# genesis fork version separates configs during test-generation runtime.
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key = (spec.fork, spec.GENESIS_FORK_VERSION, spec.__file__, balances_fn, threshold_fn)
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global _custom_state_cache_dict
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if key not in _custom_state_cache_dict:
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state = _prepare_state(balances_fn, threshold_fn, spec, phases)
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_custom_state_cache_dict[key] = state.get_backing()
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# Take an entry out of the LRU.
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# No copy is necessary, as we wrap the immutable backing with a new view.
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state = spec.BeaconState(backing=_custom_state_cache_dict[key])
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kw['state'] = state
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return fn(*args, spec=spec, phases=phases, **kw)
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return entry
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return deco
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def default_activation_threshold(spec):
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"""
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Helper method to use the default balance activation threshold for state creation for tests.
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Usage: `@with_custom_state(threshold_fn=default_activation_threshold, ...)`
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"""
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return spec.MAX_EFFECTIVE_BALANCE
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def zero_activation_threshold(spec):
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"""
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Helper method to use 0 gwei as the activation threshold for state creation for tests.
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Usage: `@with_custom_state(threshold_fn=zero_activation_threshold, ...)`
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"""
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return 0
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def default_balances(spec):
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"""
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Helper method to create a series of default balances.
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Usage: `@with_custom_state(balances_fn=default_balances, ...)`
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"""
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num_validators = spec.SLOTS_PER_EPOCH * 8
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return [spec.MAX_EFFECTIVE_BALANCE] * num_validators
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with_state = with_custom_state(default_balances, default_activation_threshold)
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def low_balances(spec):
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"""
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Helper method to create a series of low balances.
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Usage: `@with_custom_state(balances_fn=low_balances, ...)`
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"""
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num_validators = spec.SLOTS_PER_EPOCH * 8
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# Technically the balances cannot be this low starting from genesis, but it is useful for testing
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low_balance = 18 * 10 ** 9
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return [low_balance] * num_validators
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def misc_balances(spec):
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"""
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Helper method to create a series of balances that includes some misc. balances.
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Usage: `@with_custom_state(balances_fn=misc_balances, ...)`
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"""
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num_validators = spec.SLOTS_PER_EPOCH * 8
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balances = [spec.MAX_EFFECTIVE_BALANCE * 2 * i // num_validators for i in range(num_validators)]
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rng = Random(1234)
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rng.shuffle(balances)
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return balances
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def low_single_balance(spec):
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"""
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Helper method to create a single of balance of 1 Gwei.
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Usage: `@with_custom_state(balances_fn=low_single_balance, ...)`
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"""
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return [1]
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def single_phase(fn):
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"""
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Decorator that filters out the phases data.
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most state tests only focus on behavior of a single phase (the "spec").
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This decorator is applied as part of spec_state_test(fn).
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"""
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def entry(*args, **kw):
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if 'phases' in kw:
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kw.pop('phases')
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return fn(*args, **kw)
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return entry
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# BLS is turned on by default, it can be disabled in tests by overriding this, or using `--disable-bls`.
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# *This is for performance purposes during TESTING, DO NOT DISABLE IN PRODUCTION*.
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# The runner of the test can indicate the preferred setting (test generators prefer BLS to be ON).
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# - Some tests are marked as BLS-requiring, and ignore this setting.
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# (tests that express differences caused by BLS, e.g. invalid signatures being rejected)
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# - Some other tests are marked as BLS-ignoring, and ignore this setting.
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# (tests that are heavily performance impacted / require unsigned state transitions)
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# - Most tests respect the BLS setting.
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DEFAULT_BLS_ACTIVE = True
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def spec_test(fn):
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# Bls switch must be wrapped by vector_test,
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# to fully go through the yielded bls switch data, before setting back the BLS setting.
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# A test may apply BLS overrides such as @always_bls,
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# but if it yields data (n.b. @always_bls yields the bls setting), it should be wrapped by this decorator.
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# This is why @alway_bls has its own bls switch, since the override is beyond the reach of the outer switch.
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return vector_test()(bls_switch(fn))
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# shorthand for decorating @spectest() @with_state @single_phase
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def spec_state_test(fn):
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return spec_test(with_state(single_phase(fn)))
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def expect_assertion_error(fn):
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bad = False
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try:
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fn()
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bad = True
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except AssertionError:
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pass
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except IndexError:
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# Index errors are special; the spec is not explicit on bound checking, an IndexError is like a failed assert.
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pass
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if bad:
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raise AssertionError('expected an assertion error, but got none.')
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def never_bls(fn):
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"""
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Decorator to apply on ``bls_switch`` decorator to force BLS de-activation. Useful to mark tests as BLS-ignorant.
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This decorator may only be applied to yielding spec test functions, and should be wrapped by vector_test,
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as the yielding needs to complete before setting back the BLS setting.
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"""
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def entry(*args, **kw):
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# override bls setting
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kw['bls_active'] = False
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return bls_switch(fn)(*args, **kw)
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return with_meta_tags({'bls_setting': 2})(entry)
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def always_bls(fn):
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"""
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Decorator to apply on ``bls_switch`` decorator to force BLS activation. Useful to mark tests as BLS-dependent.
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This decorator may only be applied to yielding spec test functions, and should be wrapped by vector_test,
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as the yielding needs to complete before setting back the BLS setting.
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"""
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def entry(*args, **kw):
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# override bls setting
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kw['bls_active'] = True
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return bls_switch(fn)(*args, **kw)
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return with_meta_tags({'bls_setting': 1})(entry)
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def bls_switch(fn):
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"""
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Decorator to make a function execute with BLS ON, or BLS off.
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Based on an optional bool argument ``bls_active``, passed to the function at runtime.
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This decorator may only be applied to yielding spec test functions, and should be wrapped by vector_test,
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as the yielding needs to complete before setting back the BLS setting.
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"""
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def entry(*args, **kw):
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old_state = bls.bls_active
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bls.bls_active = kw.pop('bls_active', DEFAULT_BLS_ACTIVE)
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res = fn(*args, **kw)
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if res is not None:
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yield from res
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bls.bls_active = old_state
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return entry
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def with_all_phases(fn):
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"""
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A decorator for running a test with every phase
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"""
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return with_phases(ALL_PHASES)(fn)
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def with_all_phases_except(exclusion_phases):
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"""
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A decorator factory for running a tests with every phase except the ones listed
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"""
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def decorator(fn):
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return with_phases([phase for phase in ALL_PHASES if phase not in exclusion_phases])(fn)
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return decorator
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def with_phases(phases, other_phases=None):
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"""
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Decorator factory that returns a decorator that runs a test for the appropriate phases.
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Additional phases that do not initially run, but are made available through the test, are optional.
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"""
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def decorator(fn):
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def wrapper(*args, **kw):
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run_phases = phases
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# limit phases if one explicitly specified
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if 'phase' in kw:
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phase = kw.pop('phase')
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if phase not in phases:
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return
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run_phases = [phase]
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available_phases = set(run_phases)
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if other_phases is not None:
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available_phases += set(other_phases)
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# TODO: test state is dependent on phase0 but is immediately transitioned to phase1.
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# A new state-creation helper for phase 1 may be in place, and then phase1+ tests can run without phase0
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available_phases.add(PHASE0)
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phase_dir = {}
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if PHASE0 in available_phases:
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phase_dir[PHASE0] = spec_phase0
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if PHASE1 in available_phases:
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phase_dir[PHASE1] = spec_phase1
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# return is ignored whenever multiple phases are ran. If
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if PHASE0 in run_phases:
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ret = fn(spec=spec_phase0, phases=phase_dir, *args, **kw)
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if PHASE1 in run_phases:
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ret = fn(spec=spec_phase1, phases=phase_dir, *args, **kw)
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return ret
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return wrapper
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return decorator
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