Files
natsnet/docs/plans/phases/phase6sessions/session-15.md
Joseph Doherty 88b1391ef0 feat: port session 07 — Protocol Parser, Auth extras (TPM/certidp/certstore), Internal utilities & data structures
Session 07 scope (5 features, 17 tests, ~1165 Go LOC):
- Protocol/ParserTypes.cs: ParserState enum (79 states), PublishArgument, ParseContext
- Protocol/IProtocolHandler.cs: handler interface decoupling parser from client
- Protocol/ProtocolParser.cs: Parse(), ProtoSnippet(), OverMaxControlLineLimit(),
  ProcessPub/HeaderPub/RoutedMsgArgs/RoutedHeaderMsgArgs, ClonePubArg(), GetHeader()
- tests/Protocol/ProtocolParserTests.cs: 17 tests via TestProtocolHandler stub

Auth extras from session 06 (committed separately):
- Auth/TpmKeyProvider.cs, Auth/CertificateIdentityProvider/, Auth/CertificateStore/

Internal utilities & data structures (session 06 overflow):
- Internal/AccessTimeService.cs, ElasticPointer.cs, SystemMemory.cs, ProcessStatsProvider.cs
- Internal/DataStructures/GenericSublist.cs, HashWheel.cs
- Internal/DataStructures/SubjectTree.cs, SubjectTreeNode.cs, SubjectTreeParts.cs

All 461 tests pass (460 unit + 1 integration). DB updated for features 2588-2592 and tests 2598-2614.
2026-02-26 13:16:56 -05:00

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# Session 15: Leaf Nodes
## Summary
Leaf node connections — lightweight connections from edge servers to hub servers. Simpler than full routes but with subject interest propagation.
## Scope
| Go File | Features | Feature IDs | Go LOC |
|---------|----------|-------------|--------|
| server/leafnode.go | 71 | 19792049 | 3,091 |
| **Total** | **71** | | **3,091** |
## .NET Classes
- `LeafNodeHandler` — leaf node connection management
- `LeafNodeCfg` — leaf node configuration
- `LeafNodeOption` — leaf node reload option
- `ClientConnection` (partial — leafnode-specific methods)
## Test Files
| Test File | Tests | Test IDs |
|-----------|-------|----------|
| server/leafnode_test.go | 111 | 19062016 |
| server/leafnode_proxy_test.go | 9 | 18971905 |
| **Total** | **120** | |
## Dependencies
- Session 01 (Foundation Types)
- Session 07 (Protocol Parser)
- Session 08 (Client Connection)
- Session 09 (Server Core Part 1)
- Session 14 (Routes — shared routing infrastructure)
## .NET Target Location
- `dotnet/src/ZB.MOM.NatsNet.Server/LeafNode/`
## Notes
- 111 + 9 = 120 tests — this is a test-heavy session
- Leaf nodes support TLS, auth, and subject deny lists
- WebSocket transport for leaf nodes adds complexity