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feat(topics): cap age of target streams with an XADD MINID safety trim - #3951
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TELEMETRY/COMMAND/DECOM/DECOMCMD streams were bounded only by the log and TSDB microservices trimming them, so disabled logging, a missing TSDB, or a lagging trimmer let Redis grow without limit. Writes now pass an approximate MINID (OPENC3_STREAM_MAX_AGE_SECONDS, default 600s, never less than two log cycles for raw streams) so the streams stay bounded without a trimmer. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3951 +/- ##
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+ Coverage 80.28% 80.31% +0.02%
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Files 909 909
Lines 70551 70727 +176
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- Misses 13237 13250 +13
- Partials 671 674 +3
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- openc3/lib/openc3/topics/topic.rb:74 - SonarQube rubydre:S7865: replaced ENV['OPENC3_STREAM_MAX_AGE_SECONDS'] with ENV.fetch('OPENC3_STREAM_MAX_AGE_SECONDS', nil). Behaviour is unchanged: nil still selects the default.
- openc3/python/openc3/topics/topic.py:121 - SonarQube python:S5806: stopped reassigning the builtin-shadowing `id` and decode into a local `entry_id` instead. The parameter name stays `id`, so positional callers and parity with Ruby are unaffected.
- openc3/python/test/topics/test_topic.py:36,41,60,64,87 - SonarQube python:S8997: replaced direct os.environ assignments with scoped `with patch.dict(os.environ, {...})` blocks. pytest's monkeypatch can't be used in a unittest.TestCase. Every assertion is kept.
AI-Review-Bot: true
AI-Review-Run: 38335348590
AI adversarial reviewNote The fixes from this review are in #4051, a PR into SonarQube had 9 finding(s) on the reviewed commit; the reviewers were asked to fix them. ✅ Claude and Codex converged after 2 turn(s) with 1 fix commit(s). Reviewed commit: Open concerns for a human
Turn-by-turn logTurn 1: Claude (commit e1dbc9269)The stream safety MINID cap is implemented the same way in Ruby and Python. The minid kwarg reaches XADD through both the direct and the queued stores, and redis 5.4 and redis-py both support XADD MINID. I found no correctness defects; the only changes this turn fix all 7 SonarQube findings. I couldn't run the tests or syntax checks here: the sandbox needed approval for those commands, so the edits were checked by reading only.
Turn 2: Codex (no changes)Reviewed the full PR and previous reviewer’s edits; no additional defects found. Ruby/Python behavior is consistent, and all seven listed SonarQube findings are addressed. Tests were not run because dependencies are unavailable.
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AI review fixes for #3951
ryanmelt
added
the
review-and-merge-ready
- Pass OPENC3_STREAM_MAX_AGE_SECONDS to the operator in compose.yaml since setting it in .env had no effect - Skip the cap when the TargetModel log cycle lookup fails and retry every LOG_CYCLE_LOOKUP_RETRY_SECONDS instead of caching the default - Raise max ages below STREAM_MAX_AGE_MIN_SECONDS (120s) to the floor so a small value can't wipe a stream on writer clock offset - Raise in write_topic when both maxlen and minid are given - Define LogWriter.CLEANUP_DELAY from Topic.LOG_CLEANUP_DELAY_SECONDS Co-Authored-By: Claude <noreply@anthropic.com>
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I left my review changes in an attached PR. Please check that first and merge if you agree.
fix(topics): harden stream safety trim config and lookup failures
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Important Review skippedReview was skipped as selected files did not have any reviewable changes.
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| Layer / File(s) | Summary |
|---|---|
Configure retention limits and calculate safety MINIDs compose.yaml, docs.openc3.com/docs/configuration/environment.md, openc3/lib/openc3/topics/topic.rb, openc3/python/openc3/topics/topic.py, openc3/lib/openc3/logs/log_writer.rb, openc3/python/openc3/logs/log_writer.py, openc3/python/openc3/microservices/tsdb_microservice.py, openc3/spec/topics/topic_spec.rb, openc3/python/test/topics/test_topic.py |
The Topic implementations add configurable, cached stream-age limits and calculate safety MINIDs. Log streams use the greater of the configured limit and the two-cycle-plus-cleanup retention period. Compose passes the setting to the operator, and the environment documentation describes it. Tests cover configuration parsing, MINID calculations, log-cycle lookups, caching, and retry behavior. |
Add MINID support to stream writes openc3/lib/openc3/topics/topic.rb, openc3/lib/openc3/utilities/store_autoload.rb, openc3/python/openc3/topics/topic.py, openc3/python/openc3/utilities/store_implementation.py, openc3/python/openc3/utilities/store_implementation.pyi, openc3/spec/topics/topic_spec.rb, openc3/python/test/topics/test_topic.py |
Topic and Store write methods accept and forward an optional minid. Store rejects calls that supply both minid and maxlen. Tests cover argument validation and stream writes. |
Pass safety MINIDs from topic writers openc3/lib/openc3/topics/*_topic.rb, openc3/python/openc3/topics/*_topic.py, openc3/spec/topics/*_topic_spec.rb, openc3/python/test/topics/test_*_topic.py, openc3/spec/topics/topic_spec.rb, openc3/python/test/topics/test_topic.py |
Command, telemetry, and decomposition topic writers pass safety MINIDs to their stream writes. Tests check the supplied MINIDs, including both telemetry write paths. |
Priority:
Estimated code review effort: 3 (Moderate) | ~25 minutes
Change: Feature
Sequence Diagram(s)
sequenceDiagram
participant TelemetryTopic
participant Topic
participant Store
participant Redis
TelemetryTopic->>Topic: Calculate the log-stream safety MINID
TelemetryTopic->>Topic: Write the topic with minid
Topic->>Store: Forward minid to the store write
Store->>Redis: XADD with minid
Possibly related PRs
- OpenC3/cosmos#3949: Both PRs change behavior for Redis stream readers that fall behind, including safety trimming and lag handling.
Suggested labels: python, testing
Suggested reviewers: jmthomas
Merge Risk: 
45561
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The previously reported configuration failure is fixed, and no actionable merge-blocking risk remains after normal checks.
Security architecture risk: 
45561
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The cap limits memory growth, but destructive retention now depends on synchronized writer clocks. A sufficiently fast clock can discard recent packet history before consumers process it. Conservative retention windows reduce this risk, but disabling the cap cannot recover deleted data.
Retained concerns
- Medium · reliability · inferred: Automatic-ID writes derive MINID from the writer host clock, while Redis assigns stream IDs using its own clock. If a writer runs ahead by more than the effective retention age, its writes can remove recent, unprocessed history from the affected streams. The implementation documents synchronization as a requirement but does not constrain the cutoff against Redis time or the assigned entry ID. This introduces a failure-containment dependency on writer clock correctness; no remotely reachable clock-control path was established.
Security review details
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Security Blast Radius
- inferred — Each trim affects the named stream on its selected shard, not arbitrary datastore keys. A misclocked producer can repeat destructive cutoffs across the packet streams it writes, making exposure potentially broader than one packet but not establishing cross-scope authority.
Trust Boundaries and Controls
- observed — Packet payload timestamps do not determine raw automatic-ID cutoffs; the host clock and configured policy do. Production writers inspected here calculate minid internally. Although the library accepts caller-supplied minid, the inspected paths do not establish an external request parameter reaching it.
Resilience and Maintainability Implications
- inferred — The design exchanges indefinite backlog retention for reduced memory-exhaustion exposure. Log-cycle headroom and lookup retry protect normal handoff, but neither guarantees recovery of packets after consumer lag exceeds the cap. This is the declared retention tradeoff rather than a separately verified security vulnerability.
Hardening Proposals
- proposed — Consider deriving automatic-ID trim thresholds from Redis time, or atomically constraining them against the assigned entry ID, so a writer clock fault cannot turn the retention cap into premature deletion. This would strengthen containment beyond relying on clock synchronization alone.
Pre-merge checks: 
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Check name Status Explanation Resolution Docstring Coverage Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 52 functions across 25 files. (2 skipped:… 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 clearly and concisely describes the main change: adding an XADD MINID safety trim to cap target stream age. 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: Docstring Coverage
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Explanation
Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 52 functions across 25 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Inline comments:
Review comments at @openc3/python/openc3/topics/topic.py:
- Around line 97-106: Update Python’s Topic.stream_max_age_seconds and Ruby’s
corresponding stream_max_age_seconds to reject non-finite parsed values,
returning the existing disabled value for invalid input so downstream
millisecond conversion cannot raise. Preserve the current default for an unset
variable and keep Python and Ruby behavior aligned.
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📒 Files selected for processing: 26
compose.yamldocs.openc3.com/docs/configuration/environment.mdopenc3/lib/openc3/logs/log_writer.rbopenc3/lib/openc3/topics/command_decom_topic.rbopenc3/lib/openc3/topics/command_topic.rbopenc3/lib/openc3/topics/telemetry_decom_topic.rbopenc3/lib/openc3/topics/telemetry_topic.rbopenc3/lib/openc3/topics/topic.rbopenc3/lib/openc3/utilities/store_autoload.rbopenc3/python/openc3/logs/log_writer.pyopenc3/python/openc3/microservices/tsdb_microservice.pyopenc3/python/openc3/topics/command_decom_topic.pyopenc3/python/openc3/topics/command_topic.pyopenc3/python/openc3/topics/telemetry_decom_topic.pyopenc3/python/openc3/topics/telemetry_topic.pyopenc3/python/openc3/topics/topic.pyopenc3/python/openc3/utilities/store_implementation.pyopenc3/python/openc3/utilities/store_implementation.pyiopenc3/python/test/topics/test_command_decom_topic.pyopenc3/python/test/topics/test_command_topic.pyopenc3/python/test/topics/test_telemetry_decom_topic.pyopenc3/python/test/topics/test_topic.pyopenc3/spec/topics/command_decom_topic_spec.rbopenc3/spec/topics/command_topic_spec.rbopenc3/spec/topics/telemetry_decom_topic_spec.rbopenc3/spec/topics/topic_spec.rb
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# Conflicts: # docs.openc3.com/docs/configuration/environment.md
nan / inf (e.g. 1e400) raised when converted to milliseconds on every stream write, and Ruby and Python parsed malformed values differently. Both now parse strictly, warn and keep the default for invalid values. Also update telemetry topic specs from main for the minid keyword. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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The only concern is that if the TSDB microservice falls more than 1 min behind, its trim deletes the unread backlog. The cap is pretty big at 600s but TSDB only allows 60s. I've added a PR that addresses this.
What
Every write to the high-rate target streams (
TELEMETRY__,COMMAND__,DECOM__,DECOMCMD__) now passes an approximateXADD ... MINID ~ <cutoff>, so Redis/Valkey never keeps entries older than a configurable max age.OPENC3_STREAM_MAX_AGE_SECONDS: default600. Set it to0or empty to disable. Documented inconfiguration/environment.md.TELEMETRY__/COMMAND__, the max age is never less than2 × (log cycle time + LogWriter::CLEANUP_DELAY), which is 1320 s with the default 600 s cycle. The reason: historical streaming reads data that isn't in the bucket yet (the current log file) from the stream. The per-targettlm_log_cycle_time/cmd_log_cycle_timeis read fromTargetModelonce and cached per process.DECOM__/DECOMCMD__use the plain max age. Historical DECOM data comes from TSDB, and TSDB normally keeps 60 s of these streams.*. Decom reuses the raw packet's id, so an entry written by a decom that's running behind is never trimmed by its own add.write_topicin Ruby and Python (store +Topic) takes an optionalminid:keyword. Existing callers are unaffected.Topic,LogWriter, andTsdbMicroservice.Why
Until now these streams were bounded only by their consumers trimming them: the log microservice after it uploads a file, and the TSDB microservice. If logging is disabled (
PacketLogWriter#writereturns early, so no trim offsets are ever queued), TSDB isn't deployed, or a trimmer falls behind, the streams grow without bound until Redis runs out of memory. This cap bounds memory even when no trimmer is running, and it sits well above normal retention so it doesn't change behavior on a healthy system.Tradeoff: a consumer that falls further behind than the cap loses the trimmed entries. That's the intended failure mode, better than taking down Redis. Warning the user when this happens belongs in a separate PR about lag and data-loss alerting.
Testing
spec/topics/topic_spec.rbandtest/topics/test_topic.py: minid math (now-relative, id-relative, min age, disabled), log cycle lookup and caching,write_topicpassingMINIDthrough to XADD (fakeredis confirms old entries are actually trimmed), andTelemetryTopicqueued and unqueued writes.minidargument.bundle exec rspec spec/topics spec/microservices spec/logs spec/api spec/utilities/store*: 643 examples, 1 failure. The failure isdecom_microservice_spec.rb:58, an order-dependent limits-set test that passes on its own and also fails onmain.uv run pytest: 3040 passed.uv run ruff check openc3: clean.🤖 Generated with Claude Code
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