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goodwe-addon/goodwe_controller
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TARIFF-02 review: close the three other doors to the markup, and stop overclaiming
Review of PR #16 wrote a double-counting plugin four ways. PluginOptions
blocked one. The one that decided it touched nothing but
PRICE_OPTION_DEFAULTS - a public dict in the module every plugin must
already import for register() - so "the number is not in scope" was
simply false, and an absolute guarantee a reviewer trusts is worse than
a stated limit, because they stop checking.

register() now refuses, AT IMPORT, any plugin whose own code mentions a
framework-owned name: FRAMEWORK_KEYS plus PRICE_OPTION_DEFAULTS,
price_option and _o. code_leaks() parses the class and drops every
docstring node before searching, because every plugin is REQUIRED to
name its sourced components in prose - engie_dynamic says "markup" in
its docstring and a raw text scan false-positives on the documentation
the same file mandates. A check that fires on required documentation is
a check somebody deletes. test_price.py asserts that a raw scan really
would have false-positived, so the strip is proven load-bearing rather
than asserted.

It fails OPEN if inspect.getsource() cannot find the .py, which the
add-on image always can. Refusing to start a battery controller because
a static analysis could not run would trade a real outage for a
hypothetical accounting error - so instead the checks assert source was
found for all five shipped plugins, and a build that lost it is a red
check rather than a quietly disarmed guard.

All three reachable attacks are written out as plugins in the suite and
each must be refused at registration. The cost is measured, not
asserted: honest wholesale 0.188, every attack 0.219 - one markup high,
every hour, invisible in every log this add-on writes.

The guarantee is now stated at its true size everywhere it appears: the
framework adds the complement exactly once, GIVEN A CORRECT sources
DECLARATION. A plugin that declares {ENERGY} while its feed is all-in
still doubles while touching no framework name, and no code can catch
that - the declaration is an unverifiable claim about somebody else's
tariff. Measured in the suite (0.276) so the limit is a number rather
than a caveat. The docstring/declaration check verifies that a plugin's
two claims AGREE, not that either is true; that now says so.

The three surviving mutations:

M3 - _NoData's reason taking a default. This is the identical survivor
left open on RIG-01's _Unread.cause: the shape was borrowed from
sim/riglock.py including its blind spot, which is what borrowing a shape
does if nobody re-runs the mutations against the copy. Closed by
SIGNATURE - no constructor or handler of an outcome type may carry a
default - so the next one is red without anyone writing a new case.

M5 - the ENERGY-required guard was untested. Its consequence is that
adds becomes {ENERGY, TAXES} and the emitted price silently omits the
energy it is pricing.

M7 - deleting the TLS refusal went green AND the check named for it
still passed, because the old parser stripped a fixed len("https://")
and mangled http://api.energy-charts.info/p into the host
pi.energy-charts.info, which then failed the ALLOW-LIST. An assertion
that does not test what it names, inside a security check. Fixed on both
sides: the scheme is parsed as a scheme, so an http URL now resolves to
its real and declared host and only the TLS rule can refuse it; and the
check asserts the REASON. Fixing it surfaced M7b - the no-scheme guard
was survivable the same way - found by mutating my own fix, and closed
the same way.

Also carried forward: rule 7's refusal is correct forever but its stated
reason ("the provider decides nothing") expires the moment TARIFF-03 or
OPT-04 lands. test_price.py section 12 now greps app/ by AST for a
load_prices consumer and goes red when one appears, telling whoever
lands it to update the message in the same commit. The first draft of
that tripwire used a substring and matched the comment in validate.py
explaining the tripwire - the same false-positive class as the plugin
docstrings, hit twice in one ticket, and fixed the same way.

Documented rather than coded around: vars(read).get("points", []) and
bool(read) both still get past the absence type, and neither is worth
code - defining __bool__ would turn a line that reads like a guard into
one that IS a guard by accident, which is how .get(k, default) got here
in the first place.

Stated plainly in DOCS/CHANGELOG/PR: every fixture is synthetic, so the
five feed URLs and JSON shapes are verified against a belief about what
those suppliers publish rather than against the feeds. A wrong shape
degrades to no-price-data, not to a wrong price.

Review's own DST verification recorded: 149,040 hourly instants,
2020-2036, zero mismatches against zoneinfo. The residual is political,
not arithmetic, and the docstring now says so.

24 mutations driven through the suite, 0 survivors. Whole add-on suite
green. No deleted lines outside this ticket's own files; main.py still
untouched.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015VXjA3LWccN1rJsk3okyPC
2026-08-30 19:35:36 +02:00
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