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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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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughWaveform table loading rejects invalid dimensions, unsupported or unconvertible values, and non-finite values before changing channel state or sending device commands. Tests cover invalid inputs, valid uploads, and built-in sine and triangle waveforms. ChangesWaveform table validation
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The change rejects malformed waveform tables before any device command or channel state change, while valid uploads keep their existing behavior. No merge-blocking risk is identified; the change has not been tested on physical hardware. Security Architecture ReviewSecurity architecture risk: ⚪ Minimal · up to 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 Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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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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only still-valid issues, skip the rest with a brief reason, keep changes
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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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only still-valid issues, skip the rest with a brief reason, keep changes
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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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pslab/instrument/waveform_generator.pytests/test_waveform_table_validation.py
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- tests/test_waveform_table_validation.py
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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