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fix: validate waveform tables before device writes - #307
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Reviewer's GuideWaveform uploads now validate a one-dimensional 512-value table of finite real voltages before changing channel state or writing to the device. Function-generated uploads use the same boundary, while valid uploads retain existing clipping, serialization, protocol framing, and built-in waveform behavior. Sequence diagram for waveform table validation before device writesequenceDiagram
participant Caller
participant WaveformGenerator
participant ChannelState
participant ConnectionHandler
Caller->>WaveformGenerator: load_table(channel, points)
WaveformGenerator->>WaveformGenerator: _load_table(channel, points, mode)
WaveformGenerator->>WaveformGenerator: np.asarray(points)
alt invalid shape or size
WaveformGenerator-->>Caller: ValueError
else complex or non-finite values
WaveformGenerator-->>Caller: ValueError
else valid 512 finite real values
WaveformGenerator->>ChannelState: set waveform_table and wavetype
WaveformGenerator->>ConnectionHandler: send_byte(CP.WAVEGEN)
ConnectionHandler-->>Caller: upload complete
end
Sequence diagram for validated function-generated waveform uploadsequenceDiagram
participant Caller
participant WaveformGenerator
participant ChannelState
participant ConnectionHandler
Caller->>WaveformGenerator: load_function(channel, function, span)
WaveformGenerator->>WaveformGenerator: evaluate function over 512 samples
WaveformGenerator->>WaveformGenerator: _load_table(channel, y, mode)
alt generated values invalid
WaveformGenerator-->>Caller: ValueError
else generated values valid
WaveformGenerator->>ChannelState: set waveform_table and wavetype
WaveformGenerator->>ConnectionHandler: send_byte(CP.WAVEGEN)
ConnectionHandler-->>Caller: upload complete
end
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| Layer / File(s) | Summary |
|---|---|
Validation and upload behavior pslab/instrument/waveform_generator.py, tests/test_waveform_table_validation.py |
load_function passes the waveform mode to _load_table. _load_table validates that a table is one-dimensional and contains exactly 512 finite real values before changing channel state or writing to the device. Tests cover rejected inputs, valid upload framing and state, and built-in waveform uploads. |
Estimated code review effort: 2 (Simple) | ~10 minutes
Change: Bug fix · Severity of issue fixed: Medium
Suggested reviewers: bessman
Merge Risk: 
b34a7
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No actionable merge-blocking issue is established by the supplied evidence. The change appears ready to merge subject to normal checks.
Security architecture risk: 9ea22
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The change rejects malformed waveform tables before changing channel state or starting an upload. Valid inputs retain the existing voltage limits, device commands, and channel authority. No material security risk introduced or worsened by this PR was identified; physical-device behavior remains unverified.
Retained concerns
No architecture-level concerns identified.Security review details
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Security Blast Radius
- inferred — The changed upload path remains bounded to the supplied device connection and its existing SI1/SI2 channel selection. Tightening accepted waveform data does not introduce a new device target, privilege, or command family. Exposure through external applications is not established by repository-local evidence.
Trust Boundaries and Controls
- observed — Caller-supplied tables and custom-function results pass through the same shape, conversion, and finiteness controls before library-managed channel mutation or device commands. This strengthens the data-to-device boundary; it does not sandbox the caller-supplied function, which still executes before result validation.
Resilience and Maintainability Implications
- observed — Channel state and device acceptance remain non-atomic: local table and mode are committed before transmission and acknowledgement, with no rollback in the uploader. Write or acknowledgement failures can therefore leave local state ahead of device state. The merge base has the same ordering, so this is pre-existing behavior, not a PR-introduced concern.
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Pre-merge checks: 
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Check name Status Explanation Resolution Docstring Coverage Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta… Write docstrings for the functions missing them to satisfy the coverage threshold. -
Check name Status Explanation Title check The title clearly and concisely describes the main change: validating waveform tables before device writes. Linked Issues check The changes satisfy issue [ #306]._load_tablevalidates one-dimensional 512-value tables containing finite real values before device writes. It rejects malformed, non-finite, complex, boolean, and u…Out of Scope Changes check The source change, tests, and documentation support the validation and upload behavior required by issue [ #306]. No unrelated change is shown in the reviewed scope.Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Full details: Linked Issues check
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Explanation
The changes satisfy issue [
#306]._load_tablevalidates one-dimensional 512-value tables containing finite real values before device writes. It rejects malformed, non-finite, complex, boolean, and unsupported values withValueError.load_functionuses the same validation path and commits waveform mode only after validation. Tests cover state preservation, zero device calls, valid 512/32 framing, clipping, input preservation, and built-in functions.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 4 functions across 2 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Finishing Touches
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Generate unit tests (beta)
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- Create a new PR
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- Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
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Hey - I've found 1 issue
Prompt for AI Agents
Please address the comments from this code review:
## Individual Comments
### Comment 1
<location path="pslab/instrument/waveform_generator.py" line_range="309" />
<code_context>
+ points = np.asarray(points)
+ if points.ndim != 1 or points.size != self._HIGHRES_TABLE_SIZE:
+ raise ValueError("Waveform table must contain exactly 512 values.")
+ if np.iscomplexobj(points) or not np.isfinite(points).all():
+ raise ValueError("Waveform voltages must be finite real values.")
+
</code_context>
<issue_to_address>
**Object tables fail validation inconsistently**
When a 512-element table or custom-function result has a string or object dtype, `np.isfinite(points)` raises `TypeError` instead of the documented `ValueError` for unsupported values; it also rejects object arrays containing finite real values, so callers get the wrong exception and cannot upload those tables.
Safely convert supported real-valued inputs before checking finiteness, and raise `ValueError` for inputs that cannot be converted to real values.
Also at `pslab/instrument/waveform_generator.py:310`.
</issue_to_address>Sourcery assessment
Approval pending. 1 finding to address first.
Blocking findings: pslab/instrument/waveform_generator.py:309
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Inline comments:
Review comments at @pslab/instrument/waveform_generator.py:
- Around line 309-310: Update the shared voltage validation used by both table
loaders to reject unsupported string and object dtypes with ValueError before
calling np.isfinite; retain the existing finite, real-value checks. Add an
invalid-dtype case to the rejection test.
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Inline comments:
Review comments at @pslab/instrument/waveform_generator.py:
- Around line 306-320: Update the waveform table dtype validation to reject
boolean arrays while continuing to accept supported integer, unsigned, float,
object, Unicode, and string values; ensure boolean values raise ValueError
before upload.
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Inline comments:
Review comments at @pslab/instrument/waveform_generator.py:
- Line 310: Update waveform table validation around points.dtype.kind so
object-dtype arrays are checked for boolean elements before conversion to float;
reject any table containing booleans before channel state changes or device
writes, while preserving support for real numeric object arrays.
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Validate object elements before float conversion can discard imaginary values or send device commands. Assisted-by: Codex:GPT-6
|
The source audit found an additional object-array case: NumPy complex scalars and zero-dimensional complex arrays could be converted to real floats with a warning and then uploaded. Fixed in b34a78f by rejecting complex-valued object elements before conversion. Four new table/function regressions fail the previous head and pass on the fix, asserting no device calls or channel-state changes. All 62 hardware-independent tests pass; Black, Flake8, Bandit, pydocstyle and package builds pass. Sphinx builds with seven warnings. No physical hardware or firmware run is claimed. AI-assisted implementation and independent source/test review. |
Description
Fixes #306.
An incorrectly sized waveform table was sent to the device even though the upload protocol requires 512 high-resolution and 32 low-resolution values. Non-real or NaN values could also fail conversion after the command had already started.
Validate the shared upload boundary before changing channel state or writing commands. Require a one-dimensional, 512-value table of finite real voltages. Custom function results go through the same check, and their waveform mode is committed only after validation. Valid tables keep the existing voltage clipping and serialization.
Validation
No physical PSLab is connected, so the hardware integration suite and live firmware behavior have not been certified. The tests inspect the actual command calls through a mocked ConnectionHandler. No dependencies or protocol framing changed for valid inputs.
Implemented and tested with Codex assistance.
Review follow-up: native real arrays retain their dtype; object/string arrays are converted to real floats before finiteness checks. Unsupported values now raise the documented ValueError before device writes or state changes. Eight added cases reproduced the initial PR defect and pass after the fix.
Boolean-dtype tables are explicitly rejected too: the existing channel setter cannot serialize them consistently. Direct and function-generated Boolean regressions confirm ValueError occurs before state changes or device calls.
Object-array follow-up: reject Python bool and NumPy bool_ elements before converting an object array to floats. Four added cases (direct/function-generated, all-Boolean/mixed object arrays) fail on the previous PR head and pass after the fix; valid numeric object arrays still pass.
Summary by Sourcery
Validate waveform tables at the upload boundary before modifying channel state or communicating with the device.
Bug Fixes:
Enhancements:
Tests:
Summary by CodeRabbit
October 31 source-audit repair: reject complex-valued elements inside object arrays before float conversion can silently discard their imaginary components. Two new input representations (NumPy complex scalar and zero-dimensional complex array), through both table and custom-function loaders, fail on the prior head and pass after b34a78f. The checks assert no device calls or channel-state changes. Independent review also exercised zero-imaginary complex values and valid real/numeric-string object controls. Current 62 software-only tests, Black/Flake8/Bandit/pydocstyle, wheel/source build and Sphinx build pass (seven documentation warnings). Focused waveform-module line coverage increased from 35% to 38%; this is not full-project or hardware coverage. AI-assisted diagnosis, implementation and independent review.