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fix(microservices): ack malformed connect params instead of crashing - #4006
The connect directive parsed its params JSON outside any rescue in both the interface command handler and the router telemetry handler. Malformed params raised out of the handler, which killed the thread, and no ack was sent.
Ruby and Python now catch the parse error, log Invalid connect params: ..., and ack the error message. The interface or router is left unchanged and attempting isn't called. Valid params work as before.
Added a test for each handler in both languages. All 4 fail on the old code.
Fixes the IF-CON-005 deviation in architecture/specs/interface-microservice.yaml. The same parse in the router handler had the same bug, so it's fixed here too. This complements #4002, which covered cmd_params, interface_cmd and protocol_cmd.
The connect directive parsed its params JSON outside any rescue, so malformed
params killed the interface or router handler thread and no ack was sent. Both
implementations now log the error, ack it, and leave the interface as is.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
ty flagged self.logger as possibly None in the new connect-params error
paths; collapsing the fallback into one assignment lets it narrow.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Walkthrough
Ruby and Python interface and router connect handlers now return logged errors for malformed parameters. Python handlers also catch Unicode decoding errors and treat JSON null as no arguments. Tests cover malformed and valid connection parameters.
Malformed parameters and JSON null are now handled, but a directly supplied JSON false parameter can be ignored by Python connects. This is a bounded parity issue to fix or explicitly accept before merging.
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The title clearly summarizes the main change: malformed connect parameters now receive acknowledgments instead of crashing the handler.
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Actionable comments posted: 1
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Review comments at
@openc3/python/openc3/microservices/interface_microservice.py:
- Line 148: Update both connect-handler exception clauses in
interface_microservice.py at lines 148-148 and 519-519 to catch
UnicodeDecodeError alongside json.JSONDecodeError. Apply the same change to the
interface and router handlers so invalidly encoded params are handled
consistently.
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@openc3/python/openc3/microservices/interface_microservice.py:
- Line 528: Normalize `params` returned as `None` by `json.loads` to an empty
list before the `self.tlm.attempting(*params)` call, so JSON `null` follows the
successful zero-argument path and returns `SUCCESS`. Preserve the existing error
path for malformed parameters.
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Ruby splats nil to no arguments, but Python's router handler skipped the
connect and never acked, and the interface handler raised TypeError.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Review comments at
@openc3/python/openc3/microservices/interface_microservice.py:
- Line 163: Update both Python handlers that call `self.tlm.attempting` so only
`None` becomes an empty argument list, arrays remain expanded, and non-null
scalar values such as JSON `false` are passed as a single argument, matching
Ruby behavior. Add tests for `false` and `None` in both handlers.
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Minor · Functional Correctness · Quick win
Preserve non-null connect parameters in both handlers.
If params contains JSON false, params or [] calls attempting() and returns SUCCESS. The Ruby handlers call attempting(false) for the same payload. On an already connected Python interface, the no-argument call can ignore the requested connect. Normalize only None to []; handle other scalar values consistently with Ruby, and test the behavior in both handlers. (docs.python.org)
As per coding guidelines, “A behavioral change in one without the other is a finding.”
Also applies to: 547-547
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only still-valid issues, skip the rest with a brief reason, keep changes
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Review comment at @openc3/python/openc3/microservices/interface_microservice.py
at line 163:
Update both Python handlers that call `self.tlm.attempting` so only `None`
becomes an empty argument list, arrays remain expanded, and non-null scalar
values such as JSON `false` are passed as a single argument, matching Ruby
behavior. Add tests for `false` and `None` in both handlers.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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Summary
connectdirective parsed itsparamsJSON outside any rescue in both the interface command handler and the router telemetry handler. Malformed params raised out of the handler, which killed the thread, and no ack was sent.Invalid connect params: ..., and ack the error message. The interface or router is left unchanged andattemptingisn't called. Valid params work as before.Fixes the IF-CON-005 deviation in
architecture/specs/interface-microservice.yaml. The same parse in the router handler had the same bug, so it's fixed here too. This complements #4002, which coveredcmd_params,interface_cmdandprotocol_cmd.Test plan
bundle exec rspec spec/microservices/interface_microservice_spec.rb spec/microservices/router_microservice_spec.rb(30 examples, 0 failures)uv run pytest test/microservices/test_interface_microservice.py test/microservices/test_router_microservice.py(36 passed)🤖 Generated with Claude Code
Summary by CodeRabbit
nullcontinue to be handled correctly.