eth2.0-specs/tests/core/pyspec/eth2spec/test/context.py

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from eth2spec.phase0 import spec as spec_phase0
from eth2spec.phase1 import spec as spec_phase1
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from eth2spec.utils import bls
from .helpers.genesis import create_genesis_state
from .utils import vector_test, with_meta_tags
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from typing import Any, Callable, Sequence, TypedDict, Protocol
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from importlib import reload
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def reload_specs():
reload(spec_phase0)
reload(spec_phase1)
# Some of the Spec module functionality is exposed here to deal with phase-specific changes.
# TODO: currently phases are defined as python modules.
# It would be better if they would be more well-defined interfaces for stronger typing.
class Spec(Protocol):
version: str
class Phase0(Spec):
...
class Phase1(Spec):
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def upgrade_to_phase1(self, state: spec_phase0.BeaconState) -> spec_phase1.BeaconState:
...
# add transfer, bridge, etc. as the spec evolves
class SpecForks(TypedDict, total=False):
phase0: Phase0
phase1: Phase1
def with_custom_state(balances_fn: Callable[[Any], Sequence[int]],
threshold_fn: Callable[[Any], int]):
def deco(fn):
def entry(*args, spec: Spec, phases: SpecForks, **kw):
try:
p0 = phases["phase0"]
balances = balances_fn(p0)
activation_threshold = threshold_fn(p0)
state = create_genesis_state(spec=p0, validator_balances=balances,
activation_threshold=activation_threshold)
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if spec.fork == 'phase1':
# TODO: instead of upgrading a test phase0 genesis state we can also write a phase1 state helper.
# Decide based on performance/consistency results later.
state = phases["phase1"].upgrade_to_phase1(state)
kw['state'] = state
except KeyError:
raise TypeError('Spec decorator must come within state decorator to inject spec into state.')
return fn(*args, spec=spec, phases=phases, **kw)
return entry
return deco
def default_activation_threshold(spec):
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"""
Helper method to use the default balance activation threshold for state creation for tests.
Usage: `@with_custom_state(threshold_fn=default_activation_threshold, ...)`
"""
return spec.MAX_EFFECTIVE_BALANCE
def default_balances(spec):
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"""
Helper method to create a series of default balances.
Usage: `@with_custom_state(balances_fn=default_balances, ...)`
"""
num_validators = spec.SLOTS_PER_EPOCH * 256
return [spec.MAX_EFFECTIVE_BALANCE] * num_validators
with_state = with_custom_state(default_balances, default_activation_threshold)
def low_balances(spec):
"""
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Helper method to create a series of low balances.
Usage: `@with_custom_state(balances_fn=low_balances, ...)`
"""
num_validators = spec.SLOTS_PER_EPOCH * 8
# Technically the balances cannot be this low starting from genesis, but it is useful for testing
low_balance = 18 * 10 ** 9
return [low_balance] * num_validators
def misc_balances(spec):
"""
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, ...)`
"""
num_validators = spec.SLOTS_PER_EPOCH * 8
num_misc_validators = spec.SLOTS_PER_EPOCH
return [spec.MAX_EFFECTIVE_BALANCE] * num_validators + [spec.MIN_DEPOSIT_AMOUNT] * num_misc_validators
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def single_phase(fn):
"""
Decorator that filters out the phases data.
most state tests only focus on behavior of a single phase (the "spec").
This decorator is applied as part of spec_state_test(fn).
"""
def entry(*args, **kw):
if 'phases' in kw:
kw.pop('phases')
return fn(*args, **kw)
return entry
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# BLS is turned off by default *for performance purposes during TESTING*.
# The runner of the test can indicate the preferred setting (test generators prefer BLS to be ON).
# - Some tests are marked as BLS-requiring, and ignore this setting.
# (tests that express differences caused by BLS, e.g. invalid signatures being rejected)
# - Some other tests are marked as BLS-ignoring, and ignore this setting.
# (tests that are heavily performance impacted / require unsigned state transitions)
# - Most tests respect the BLS setting.
DEFAULT_BLS_ACTIVE = False
def spec_test(fn):
# Bls switch must be wrapped by vector_test,
# to fully go through the yielded bls switch data, before setting back the BLS setting.
# A test may apply BLS overrides such as @always_bls,
# but if it yields data (n.b. @always_bls yields the bls setting), it should be wrapped by this decorator.
# This is why @alway_bls has its own bls switch, since the override is beyond the reach of the outer switch.
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):
return spec_test(with_state(single_phase(fn)))
def expect_assertion_error(fn):
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bad = False
try:
fn()
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bad = True
except AssertionError:
pass
except IndexError:
# Index errors are special; the spec is not explicit on bound checking, an IndexError is like a failed assert.
pass
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if bad:
raise AssertionError('expected an assertion error, but got none.')
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def never_bls(fn):
"""
Decorator to apply on ``bls_switch`` decorator to force BLS de-activation. Useful to mark tests as BLS-ignorant.
This decorator may only be applied to yielding spec test functions, and should be wrapped by vector_test,
as the yielding needs to complete before setting back the BLS setting.
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"""
def entry(*args, **kw):
# override bls setting
kw['bls_active'] = False
return bls_switch(fn)(*args, **kw)
return with_meta_tags({'bls_setting': 2})(entry)
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def always_bls(fn):
"""
Decorator to apply on ``bls_switch`` decorator to force BLS activation. Useful to mark tests as BLS-dependent.
This decorator may only be applied to yielding spec test functions, and should be wrapped by vector_test,
as the yielding needs to complete before setting back the BLS setting.
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"""
def entry(*args, **kw):
# override bls setting
kw['bls_active'] = True
return bls_switch(fn)(*args, **kw)
return with_meta_tags({'bls_setting': 1})(entry)
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def bls_switch(fn):
"""
Decorator to make a function execute with BLS ON, or BLS off.
Based on an optional bool argument ``bls_active``, passed to the function at runtime.
This decorator may only be applied to yielding spec test functions, and should be wrapped by vector_test,
as the yielding needs to complete before setting back the BLS setting.
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"""
def entry(*args, **kw):
old_state = bls.bls_active
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bls.bls_active = kw.pop('bls_active', DEFAULT_BLS_ACTIVE)
res = fn(*args, **kw)
if res is not None:
yield from res
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bls.bls_active = old_state
return entry
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all_phases = ['phase0', 'phase1']
def with_all_phases(fn):
"""
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A decorator for running a test with every phase
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"""
return with_phases(all_phases)(fn)
def with_all_phases_except(exclusion_phases):
"""
A decorator factory for running a tests with every phase except the ones listed
"""
def decorator(fn):
return with_phases([phase for phase in all_phases if phase not in exclusion_phases])(fn)
return decorator
def with_phases(phases, other_phases=None):
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"""
Decorator factory that returns a decorator that runs a test for the appropriate phases.
Additional phases that do not initially run, but are made available through the test, are optional.
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"""
def decorator(fn):
def wrapper(*args, **kw):
run_phases = phases
# limit phases if one explicitly specified
if 'phase' in kw:
phase = kw.pop('phase')
if phase not in phases:
return
run_phases = [phase]
available_phases = set(run_phases)
if other_phases is not None:
available_phases += set(other_phases)
# TODO: test state is dependent on phase0 but is immediately transitioned to phase1.
# A new state-creation helper for phase 1 may be in place, and then phase1+ tests can run without phase0
available_phases.add('phase0')
phase_dir = {}
if 'phase0' in available_phases:
phase_dir['phase0'] = spec_phase0
if 'phase1' in available_phases:
phase_dir['phase1'] = spec_phase1
# return is ignored whenever multiple phases are ran. If
if 'phase0' in run_phases:
ret = fn(spec=spec_phase0, phases=phase_dir, *args, **kw)
if 'phase1' in run_phases:
ret = fn(spec=spec_phase1, phases=phase_dir, *args, **kw)
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return ret
return wrapper
return decorator