feat: S39 detect a TLS configuration change from the stream - #809
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Adds a mandatory Version member to the SolidSyslogStream vtable and a Version / VersionContext pair to both TLS stream configs. The stream sender polls it every Send alongside the endpoint version and reconnects when either has moved, so rotating credentials or repinning a peer is a counter bump from any task rather than a Disconnect call that races the servicing pass. Narrows the SolidSyslogSender_Disconnect contract to the servicing thread and moves both rotation passages in docs/tls.md onto the version.
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Included review availability: 4 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. WalkthroughThe stream interface now exposes a monotonic configuration version. The sender detects endpoint or stream version changes and reconnects. Mbed TLS and OpenSSL accept version callbacks. Other streams report zero. Tests and TLS documentation cover the new behaviour. ChangesStream versioning
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to This change reconnects streams when configuration versions change, enabling TLS configuration updates to take effect on later sends. Destination-change guidance and cross-task update ordering remain insufficiently defined, which can leave reconnect behavior unreliable in affected integrations. Sequence Diagram(s)sequenceDiagram
participant Sender
participant Stream
participant Connection
Sender->>Stream: poll configuration version
Sender->>Connection: compare stored and current versions
Connection-->>Sender: close when the version changes
Sender->>Stream: reopen and send the record
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 10.42% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 96 functions across 27 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@Core/Interface/SolidSyslogStreamDefinition.h`:
- Around line 48-53: Define the synchronization contract for
SolidSyslogStreamVersionFunction: require synchronized reads and ensure adapters
publish configuration before updating the version observed by
StreamSender_ConfigurationMoved. Update OpenSslStream_Version and
MbedTlsStream_Version accordingly, and add concurrent-update coverage for both
adapters.
In `@Core/Source/SolidSyslogNullStream.c`:
- Around line 67-71: Update both callback functions in SolidSyslogNullStream,
including NullStream_Version, to return the unsigned zero literal 0U instead of
0, preserving their existing behavior.
In `@docs/tls.md`:
- Around line 207-208: Update the destination-change clause in the TLS
documentation to say the connection closes only when the configured endpoint
version changes, and instruct integrators to advance the value returned by
EndpointVersion to trigger reconnection; preserve the existing behavior for
EndpointVersion == NULL, which pins the destination.
In `@Platform/MbedTls/Interface/SolidSyslogMbedTlsStream.h`:
- Around line 86-92: Update the documentation for
SolidSyslogStreamVersionFunction and VersionContext to require rotation to
mutate the stable objects referenced by the original configuration, rather than
replacing config->Credentials or config->ServerName pointers. Clarify that
reconnects use those referenced objects after Version changes, while preserving
the existing polling and NULL semantics.
In `@Platform/OpenSsl/Interface/SolidSyslogOpenSslStream.h`:
- Around line 73-80: Update the Version contract used by
SolidSyslogOpenSslStream_Initialise so reconnects cannot depend on replaced
caller-side Credentials, ServerName, or CipherList values after the
configuration is copied. Require updates through stable referenced objects, or
provide a reconnect-time configuration accessor that returns current values,
matching the Mbed TLS contract and including CipherList.
In `@Platform/OpenSsl/Source/SolidSyslogOpenSslStream.c`:
- Line 696: Update OpenSslStream_NullVersion to return the unsigned zero literal
0U, preserving its uint32_t return behavior.
In `@Platform/Posix/Source/SolidSyslogPosixTcpStream.c`:
- Around line 341-344: Update the PosixTcpStream_Version function’s uint32_t
return literal from 0 to 0U, preserving the existing value and behavior while
meeting the unsigned-literal coding standard.
In `@Tests/SolidSyslogStreamSenderTest.cpp`:
- Around line 936-969: Extract the shared sender fields, setup/teardown
lifecycle, and Send() helper from SolidSyslogStreamSenderStreamVersion into a
TEST_BASE fixture, then have both sender test groups use TEST_GROUP_BASE with
that fixture. Preserve the group-specific error-handler setup in
SolidSyslogStreamSenderDeliveryHealth.
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Core/Interface/SolidSyslogSender.hCore/Interface/SolidSyslogStream.hCore/Interface/SolidSyslogStreamDefinition.hCore/Source/SolidSyslogNullStream.cCore/Source/SolidSyslogStream.cCore/Source/SolidSyslogStreamSender.cCore/Source/SolidSyslogStreamSenderPrivate.hPlatform/LwipRaw/Source/SolidSyslogLwipRawTcpStream.cPlatform/MbedTls/Interface/SolidSyslogMbedTlsStream.hPlatform/MbedTls/Source/SolidSyslogMbedTlsStream.cPlatform/OpenSsl/Interface/SolidSyslogOpenSslStream.hPlatform/OpenSsl/Source/SolidSyslogOpenSslStream.cPlatform/PlusTcp/Source/SolidSyslogPlusTcpTcpStream.cPlatform/Posix/Source/SolidSyslogPosixTcpStream.cPlatform/Windows/Source/SolidSyslogWinsockTcpStream.cTests/FreeRtos/SolidSyslogPlusTcpTcpStreamTest.cppTests/Lwip/SolidSyslogLwipRawTcpStreamTest.cppTests/MbedTls/SolidSyslogMbedTlsStreamTest.cppTests/MbedTlsIntegration/SocketStream.cTests/OpenSslIntegration/BioPairStream.cTests/SolidSyslogNullStreamTest.cppTests/SolidSyslogOpenSslStreamTest.cppTests/SolidSyslogPosixTcpStreamTest.cppTests/SolidSyslogStreamSenderTest.cppTests/SolidSyslogWinsockTcpStreamTest.cppTests/StreamFake.cTests/StreamFake.hdocs/platforms/mbedtls/index.mddocs/platforms/openssl/index.mddocs/tls.mdmisra_suppressions.txt
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Ordering is now part of the Version contract: make the change, then move the version, or the sender can reopen with what is being replaced. Both TLS config briefs say the struct is copied at Create, so a runtime change is made in what the fields point at rather than by reassigning one. S39.02 (#810) removes that trap for ServerName. docs/tls.md names the endpoint's version as the trigger rather than "the destination changes", matching how the stream's own is described. Unsigned zero literals in the version providers, and the two stream sender groups over StreamFake now share a TEST_BASE.
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1 participant
Purpose
Step 12 of E39. Closes the change-detection gap in #735: a TLS stream had no
equivalent of
SolidSyslogEndpointVersionFunction, so the documented way toapply a rotated credential or a repinned peer was
SolidSyslogSender_Disconnect.The issue body has been rewritten with the agreed shape and with the threading
argument found while designing this, which is the substantive reason the gap was
worth closing rather than an ergonomic one.
SolidSyslogSenderDefinition.hdocuments
Sendas called on the servicing thread and not reentrant;Disconnectis a sibling on the same vtable, mutating the same connection state, and there is
no lock in the stream sender or in either TLS stream. An integrator rotating
credentials on a provisioning thread, or bounding credential residency from a
timer, therefore raced the servicing pass and had no way to fix it - the state is
private to the translation unit.
docs/tls.mdrecommended exactly that, twice.No
Closeskeyword: this merges intofeature/tls-rework, and the issue isclosed from the final branch-to-main PR.
Change Description
The version sits on the TLS stream config, not on the sender config, and reaches
Core through the
SolidSyslogStreamvtable. That was your call after I firstproposed the sender config, and it is the better one: the material and the signal
that it changed are declared together, exactly as the endpoint's are, so the
integrator reads the whole story off one struct. One counter then covers
everything on it - trust anchors, pinned fingerprints, the client credential, the
expected peer name, the cipher list - and whatever #733 adds. An integrator
wiring plain TCP sees no new field.
SolidSyslogStreamgains a mandatoryuint32_t (*Version)(base), answered bySolidSyslogStream_Version. Four plain TCP streams,NullStreamand the twointegration-test streams report 0 for their lifetime.
Version+VersionContext, with the Null Objectsubstituted at Initialise when the integrator wires none - the same shape
GetHandshakeTimeoutMsalready uses.StreamSenderkeepsLastStreamVersionbesideLastEndpointVersionandreconnects when either has moved, behind a named
StreamSender_ConfigurationMovedpredicate.SolidSyslogSender_Disconnectkeeps its behaviour; its contract now says itbelongs on the servicing thread and names the version as the alternative.
Adding a vtable member breaks any external
SolidSyslogStreamimplementation.Taken deliberately, on your ruling that no ports exist and 0.1.0 has not been
forked, and E39 is the release carrying the TLS API break.
One thing the design does not solve, and the Mbed TLS page now says so.
Moving a version applies a change asynchronously - the reconnect happens inside
the next
Send- so it says nothing about when the old material stopped beingread. That is fine for material replaced in place, but the Mbed TLS handle source
requires freeing what the open connection may still hold, and
MbedTlsHandleCredentials_Releaseis a verified no-op, so nothing announces theboundary to an integrator using it. That page now directs the free and re-parse
either to the servicing task after a
Disconnectreturns, or into a credentialssource's
Release.docs/tls.mdstates the same separation once: applying achange and destroying what it replaced are different questions.
Test Evidence
Red/green throughout, and every assertion mutation-checked.
StreamFake_SetVersion), then failedon the assertion once the fake existed. Filling the vtable member made the
whole suite segfault on the streams that had not been given one, which is what
drove each implementation in. Removing the stream-version term from the
reconnect condition fails exactly one test; making the reconnect lazy-only
fails the two version tests and both endpoint-version tests.
is wired. Passing
NULLinstead ofVersionContextand returning 1 from theNull Object fail one test each, per pack.
suites.
SecondSendDoesNotReconnectalready guards "steady version does not reconnect",so I did not add a duplicate.
Gates run locally: gcc debug (2 suites) and freertos-host (24 suites, both
integration lanes against the real libraries) green;
clang-formatreflow overthe tree, then
misra_renumber.py --apply(16 updates, settled on re-run);CI's own
cppcheck --addon=misrainvocation reproduced - six findings, allpre-existing and none in a file this branch touches; markdownlint 0 errors;
check_references.py,check_platform_docs.py,check_spdx_headers.pyandcheck_headers_c89.py(179 public headers against ISO C89) all pass.Not run locally, left to CI: tidy, sanitize, coverage, Windows, BDD, IWYU.
Areas Affected
SolidSyslogStreamis a public vtable, so this is an API break for externalstream implementations. Core (
Stream,StreamSender,NullStream), all sixproduction stream adapters, both TLS packs' public configs, three test streams,
docs/tls.mdand both TLS platform pages.No BDD movement: nothing an end user observes changes, and the equivalence matrix
is about peer behaviour. Scenario count unchanged.
Summary by CodeRabbit
New Features
Documentation
Tests