[Nexthop][fboss2-dev] Unify agent/BGP config session + decouple ConfigSession header - #1446
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[Nexthop][fboss2-dev] Unify agent/BGP config session + decouple ConfigSession header#1446hillol-nexthop wants to merge 3 commits into
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This was referenced Jul 31, 2026
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Follow-up cleanups to the BGP-aware config session infra (facebook#1344): - Collapse the BGP_RESTART action level into AGENT_WARMBOOT (bgpd has no hitless reload; its restart already runs the agent-warmboot code path). - Introduce a single ConfigDomain descriptor + configDomains() and shared per-domain helpers so commit(), rollback() and `config session diff` handle the agent and BGP domains uniformly (private DiffDomain removed). - Make the agent skip-when-unchanged like BGP: a commit whose staged config equals what is already promoted is a true no-op (no git revision, no symlink churn, no reloadConfig()/bgpd restart). Change detection is semantic (compare the deserialized thrift structs), so formatting-only diffs don't count. - Consolidate `config session clear` onto a static stagedSessionFilePaths() and reuse ConfigSession::readStagedContent() in diff. - Make ConfigSession::saveConfig(service, level) generic over the service and reduce saveBgpConfig() to a thin wrapper. - Keep the heavy generated thrift headers out of ConfigSession.h: use the *_types_fwd.h forward-declaration headers, hold agentConfig_/bgpConfig_ by std::unique_ptr, and drop the configLoaded_/bgpConfigLoaded_ bools (null == not loaded). - clang-tidy: use auto for the SimpleJSONSerializer template-cast results. Built fboss2-dev + the config unit tests; config-session/commit/diff/BGP/clear tests pass. Verified the agent no-op behaviour live on test switches.
Removed comments about the destructor definition in ConfigSession.h.
…thInterface call main renamed findFirstEthInterface() to getRandomInterfacePortName() (virtual-management-port fix); convert the branch-added no-op-commit test to the new helper. Drop the three includes ConfigSession.cpp no longer uses directly (misc-include-cleaner runs as errors in CI).
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Summary
Follow-up to #1344 (BGP-aware fboss2 config session): unify the agent and BGP
domains inside
ConfigSessionand decouple theConfigSession.hheader fromthe heavy generated thrift types.
BGP_RESTARTaction level intoAGENT_WARMBOOT(bgpd has nohitless reload; its restart already runs the agent-warmboot code path).
ConfigDomaindescriptor +configDomains()and sharedper-domain helpers so
commit(),rollback()andconfig session diffhandle the agent and BGP domains uniformly (private
DiffDomainremoved).equals what is already promoted is a true no-op (no git revision, no symlink
churn, no
reloadConfig()/bgpd restart). Change detection is semantic(compare the deserialized thrift structs), so formatting-only diffs don't
count.
config session clearonto a staticstagedSessionFilePaths()and reuse
ConfigSession::readStagedContent()in diff.ConfigSession::saveConfig(service, level)generic over the service andreduce
saveBgpConfig()to a thin wrapper.ConfigSession.h: use the*_types_fwd.hforward-declaration headers, holdagentConfig_/bgpConfig_by
std::unique_ptr, and drop theconfigLoaded_/bgpConfigLoaded_bools(null == not loaded).
Test Plan
fboss/cli/fboss2/test/config:cmd_config_testpasses (the config-session /commit / diff / BGP / clear unit tests cover the refactored paths).
//fboss/cli/...builds and tests pass on top ofupstream/main.