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- Add INST/INST2 MEMDUMP command whose CRC over OFFSET and SIZE is set by memdump_cmd_crc_conversion and checked by sim_inst - Add MEMDUMP telemetry with a variable DATA block, the target CRC and ground CALC_CRC/CRC_OK items from crc32_conversion - Add MEMDUMP_FAULT so sim_inst can flip a bit in or drop the next dump - Add memdump procedures that retry bad or missing chunks, wait out link loss and resume from a bucket checkpoint before put_target_file - Add a MEMDUMP screen to send dumps, inject faults and run the script Co-Authored-By: Claude <noreply@anthropic.com>
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No actionable comments were generated in the recent review.
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| Layer / File(s) | Summary |
|---|---|
Memory-dump protocol and CRC conversions targets/INST/cmd_tlm/{inst_cmds.txt,inst_tlm.txt}, targets/INST/lib/{crc32_conversion.rb,memdump_cmd_crc_conversion.rb}, targets/INST2/cmd_tlm/{inst_cmds.txt,inst_tlm.txt}, targets/INST2/lib/{crc32_conversion.py,memdump_cmd_crc_conversion.py} |
Both targets define MEMDUMP commands and telemetry with variable-length data and CRC fields. CRC conversions calculate request and telemetry checksums. |
Simulator request and response handling targets/INST/lib/sim_inst.rb, targets/INST2/lib/sim_inst.py |
Both simulators validate request CRC and size, generate address-based data, and queue telemetry responses. The BAD_CRC option flips a data bit after the CRC is calculated. |
Chunk retrieval, verification, and display targets/INST/procedures/memdump.rb, targets/INST2/procedures/memdump.py, targets/INST/screens/memdump.txt, targets/INST2/screens/memdump.txt, playwright/tests/{cmd-tlm-server/tlm-pkts.p.spec.ts,data-extractor.p.spec.ts,tlm-viewer.p.spec.ts} |
The procedures request chunks, handle link and response timeouts, filter stale responses, and verify chunk CRCs. They upload the completed dump, read it back, and check its contents or CRC. Screens provide dump controls and display dump metadata and data. Playwright tests cover the MEMDUMP display and updated target and packet searches. |
Priority:
Estimated code review effort: 3 (Moderate) | ~25 minutes
Change: Feature
Sequence Diagram(s)
sequenceDiagram
participant MemdumpProcedure
participant SimInst
participant MEMDUMP
participant Bucket
MemdumpProcedure->>SimInst: Send MEMDUMP request with OFFSET, SIZE, and CRC
SimInst->>MEMDUMP: Populate data and calculate target CRC
MEMDUMP->>MemdumpProcedure: Return dump telemetry
MemdumpProcedure->>MemdumpProcedure: Validate response fields and chunk CRC
MemdumpProcedure->>Bucket: Upload completed dump
MemdumpProcedure->>Bucket: Read back uploaded dump
Suggested labels: python, testing
Merge Risk: 
bd448
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The MEMDUMP protocol, retry flow, telemetry CRC handling, and final-chunk buffering have no confirmed merge-blocking issues.
Security architecture risk: 
bd448
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The new flow generates synthetic demo data rather than reading real memory, bounds individual requests and checks received chunks before uploading them. No introduced security vulnerability was established. Recovery remains in-memory, and storage publication and concurrent-run guarantees are not fully established.
Retained concerns
No architecture-level concerns identified.Security review details
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Security Blast Radius
- inferred — The demonstrated new effects are synthetic telemetry for the selected demo target and fixed-prefix dump-file writes within the procedure's existing script scope. The inspected flow does not establish arbitrary memory disclosure, arbitrary output-path selection or new cross-scope authority. Effective deployment permissions were not verified.
Security Findings and Attack Paths
- observed — The specifically flagged value symbol is a locator helper declared inside the new Playwright test and called with literal telemetry-item names. It does not introduce a production entrypoint. The linked fixture exports test utilities and is unchanged in the full PR comparison.
Trust Boundaries and Controls
- inferred — CRC checks provide accidental-corruption detection, not sender authentication or authorization. The screens invoke the existing command and script interfaces; storage uses the existing scoped helpers. No new identity mechanism is introduced by these inspected callers, and server-side authorization remains outside the verified source coverage.
Resilience and Maintainability Implications
- inferred — Concurrent requests can overwrite each simulator's single pending response, and same-target runs started within one second select the same output name. These are ownership limitations rather than established security failures here: requests are retried, accepted chunks require matching coordinates and CRC, and the current procedures generate identical deterministic content. Concurrent execution and backend overwrite behavior were not exercised.
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Pre-merge checks: 
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Check name Status Explanation Resolution Docstring Coverage Docstring coverage is 17.65% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 11 files. Write docstrings for the functions missing them to satisfy the coverage threshold. -
Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title "feat(demo): add MEMDUMP memory dump with CRC checks and recovery" matches the main change. The PR adds a MEMDUMP command, telemetry packet, CRC conversions, simulator support, a recovery pr… Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Title check
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Explanation
The title "feat(demo): add MEMDUMP memory dump with CRC checks and recovery" matches the main change. The PR adds a MEMDUMP command, telemetry packet, CRC conversions, simulator support, a recovery procedure, and a screen in the demo target. The title names the primary feature and its CRC and recovery aspects. It omits the MEMDUMP_FAULT injection and the file streaming purpose, which is expected for a short title.
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4131 +/- ##
==========================================
+ Coverage 79.75% 80.34% +0.59%
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Files 907 911 +4
Lines 69994 70779 +785
Branches 2688 2688
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+ Hits 55822 56869 +1047
+ Misses 13502 13236 -266
- Partials 670 674 +4
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@openc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/lib/sim_inst.rb:
- Around line 290-294: In the MEMDUMP response path, reset the reused
memdump_packet buffer to its defined_length before writing DATA so shorter
writes remove stale tail bytes. Preserve CCSDSSEQFLAGS and CCSDSSEQCNT by saving
their values before the reset and restoring them afterward, so the response path
continues the existing sequence state.
Review comments at
@openc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/lib/sim_inst.py:
- Around line 267-271: Update the MEMDUMP command handler around memdump_packet
writes to clear the reused packet buffer before writing the response, preventing
stale trailing data from being included. Save and restore CcsdsSeqFlags and
ccsdsseqcnt around the reset so the packet’s sequence state is preserved.
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📒 Files selected for processing: 14
openc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/cmd_tlm/inst_cmds.txtopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/cmd_tlm/inst_tlm.txtopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/lib/crc32_conversion.rbopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/lib/memdump_cmd_crc_conversion.rbopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/lib/sim_inst.rbopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/procedures/memdump.rbopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST/screens/memdump.txtopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/cmd_tlm/inst_cmds.txtopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/cmd_tlm/inst_tlm.txtopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/lib/crc32_conversion.pyopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/lib/memdump_cmd_crc_conversion.pyopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/lib/sim_inst.pyopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/procedures/memdump.pyopenc3-cosmos-init/plugins/packages/openc3-cosmos-demo/targets/INST2/screens/memdump.txt
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calmonroe
marked this pull request as ready for review
October 23, 2026 21:36
ryanmelt
previously approved these changes
Oct 24, 2026
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mcosgriff
approved these changes
Oct 26, 2026
mcosgriff
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If you squash the commits might want to tweak the PR description
From Claude:
- MEMDUMP_FAULT: it's now the BAD_CRC parameter on MEMDUMP.
- "drop the next dump": there's no drop fault.
- "resume from a bucket checkpoint": there's no checkpoint. The dump is held in memory and written once at the end.
- "wait out link loss": it only waits when sending the command fails, not when a response goes missing.
ryanmelt
approved these changes
Oct 26, 2026
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What changed
Why it changed
Allows us to show file streaming capability in COSMOS
Testing strategy
Add playwright test for MEMDUMP screen in telem viewer. All existing tests pass
Manually tested screen and script for expected demo behavior
Summary by CodeRabbit