CharlesKWON
d98f5e1767
First end-to-end working version of the PostgreSQL-wire-compatible
TCP server frontend. A standard `psql` client now connects, runs
`SELECT * FROM employees`, and gets back a properly typed result
set rendered by psql with the right column alignment:
ID | NAME | SALARY
----+----------------------+----------
1 | Alice | 50000.00
2 | Bob | 42000.50
3 | Cho | 77500.00
This is the Phase 2 deliverable from the approved plan at
/Users/charleskwon/.claude/plans/compiled-launching-shore.md.
Builds on the session-state refactor in 93cf5c8 — each connection
gets its own TSqlSession on the PRG side via the new PG_NEW_SESSION
HB_FUNC, so concurrent psql clients won't share transaction logs
or plan caches.
Scope
-----
v1.0 MVP: Simple Query only, trust auth, no TLS yet. SELECT works
against the full FiveSql2 surface (CTEs, window functions, JOINs,
aggregates). DML + per-session transactions are Phase 3, extended
protocol is Phase 4, auth + TLS are Phases 5/6.
Architecture
------------
psql/pgx/JDBC ──TCP:5432──▶ pgserver.Listener
│ accept()
▼ go handleConn(net.Conn)
┌─────────────────────────────┐
│ Session goroutine │
│ 1. SSLRequest peek │
│ 2. StartupMessage │
│ 3. AuthenticationOk (trust) │
│ 4. ParameterStatus×7 │
│ 5. BackendKeyData │
│ 6. ReadyForQuery('I') │
│ 7. loop: Receive() → │
│ dispatchSimpleQuery → │
│ hbrt.Thread.Function( │
│ FIVE_SQL,sql,...,sess) │
│ emit RowDescription │
│ emit DataRow×N │
│ emit CommandComplete │
│ emit ReadyForQuery │
└─────────────────────────────┘
One goroutine per connection, each owning its own *hbrt.Thread and
TSqlSession instance. Uses the existing audit-fixed NewThread()
(cde8673) so statics + WA factory propagate.
New files (hbrtl/pgserver/)
---------------------------
* server.go — Config, Server, Serve loop with MaxConnections gate
via semaphore, Close drains in-flight sessions.
* session.go — full lifecycle: SSLRequest peek + prefixedConn
byte-injection trick for StartupMessage, ParameterStatus
broadcast (server_version "14.0 (FiveSql2)" so pgx negotiates),
BackendKeyData (random pid+secret per session, no CancelRequest
yet), query loop dispatching only Simple Query in v1.0 with a
loud "0A000 not supported" for Extended messages.
* dispatch.go — runSQL invokes FIVE_SQL via PushSymbol+Function,
unpacks the engine's `{aFieldNames, aRows}` envelope or the
`{{"__error__"}, {{nCode, cMsg, cSQL}}}` error shape, emits
RowDescription with text-format OIDs and DataRow per row.
* typemap.go — pgTypeFor() picks INT4 / INT8 / NUMERIC / TEXT /
DATE / TIMESTAMP / BOOL by sampling the first row's value type;
encodeText() formats each cell, returning nil-slice for NULL
(the PG length=-1 convention).
* errmap.go — sqlStateFor() maps FiveSql2 SQL_ERR_* codes to
canonical PG SQLSTATEs (42601/42P01/42703/42804/23505/23514/
23503/25P02/42501/02000/XX000).
* auth.go — trust mode in v1.0; password/MD5/SCRAM lands Phase 5
but the dispatch sentinel is already in place.
* tls.go — upgradeToTLS stub for SSLRequest handling; the byte-
ordering is already wired so Phase 6 just plugs in tls.Config.
* register.go — package init() registers pg_server_start /
pg_server_stop HB_FUNCs. Importing the package (done from
hbrtl/register.go via blank import) is enough to enable them.
* pgserver_test.go — unit tests for encodeText (numeric, string,
NIL), pgTypeFor (OID dispatch), sqlStateFor (error mapping),
commandTagFor (SELECT/INSERT/UPDATE/DELETE/BEGIN/COMMIT).
Other changes
-------------
* _FiveSql2/src/TSqlSession.prg — added PG_NEW_SESSION() factory
used by the Go dispatcher to allocate a per-connection session
bypassing the embedded process default.
* hbrtl/register.go — blank-import five/hbrtl/pgserver so its
init() fires and the HB_FUNCs land in the global dynamic-func
table for VM symbol lookup.
* go.mod / go.sum — github.com/jackc/pgx/v5 v5.9.2 (pgproto3
subpackage). MIT license. Same library pgx itself uses, so
protocol coverage matches the de-facto Go PG ecosystem.
Verification
------------
$ pg_server_start(15432, "trust") /* PRG one-liner */
$ psql -h 127.0.0.1 -p 15432 -U fiveuser -c 'SELECT * FROM employees'
→ 3 rows rendered correctly by psql (ID as INT4, NAME as TEXT,
SALARY as NUMERIC(10,2) with 2 decimal places)
All six release gates green:
go test ./... ✓ (incl. new hbrtl/pgserver tests)
FiveSql2 SQL:1999 43/43 ✓
Harbour compat 56/56 ✓
std.ch 17/17 ✓
FRB 7/7 ✓
examples 65/71 ✓ (unchanged baseline)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
FiveSql2 — SQL Engine for Harbour DBF/NTX/CDX
Pratt parser + SQL:1992-2023 full standard support Supports both NTX (Clipper) and CDX (FoxPro/ADS) indexes
Architecture
five_SQL("SELECT ...")
│
├── TSqlLexer Tokenizer
├── TSqlParser2 Pratt parser (data-driven operators)
├── TSqlExecutor Query executor (Volcano model)
│ ├── TSqlAlias Central alias manager (no collisions)
│ ├── TSqlIndex NTX/CDX index optimization (auto-detect)
│ ├── TSqlAgg GROUP BY / aggregation
│ ├── TSqlSort ORDER BY / DISTINCT
│ ├── TSqlDDL CREATE/DROP/ALTER TABLE/INDEX
│ └── TSqlTxn BEGIN/COMMIT/ROLLBACK
├── TSqlExpr AST nodes + expression evaluation
└── TSqlFunc 60+ scalar functions
Build & Test
export PATH="/path/to/harbour-core/bin/linux/gcc:$PATH"
export HB_INSTALL_PREFIX="/path/to/harbour-core"
make # Build all tests
make test # Run all 157 tests
make bench # Parser benchmark
make clean # Clean
SQL Standard Coverage
| Standard | Features | Tests |
|---|---|---|
| SQL:1992 | SELECT, JOIN, GROUP BY, HAVING, Subquery, CASE, CAST | 43 |
| SQL:1999 | CTE, Recursive CTE, Window Functions, MERGE | 10 |
| SQL:2003 | SIMILAR TO, GROUPING SETS, LATERAL, Window frames | 64 |
| SQL:2008 | FETCH/OFFSET, FOR UPDATE, Extended MERGE | (incl.) |
| SQL:2016 | JSON functions, LISTAGG | (incl.) |
| SQL:2023 | ANY_VALUE, GREATEST/LEAST, BOOL_AND/OR | (incl.) |
| Challenge | LeetCode-level complex queries | 15 |
| Extreme | Production analytics stress tests | 15 |
Adding New Operators
Edit TSqlParser2.prg, method InitInfixTables():
::hInfixTT[ TK_MYOP ] := { "<=>", 40, 41, ND_BIN }
One line. No structural changes needed.
Copyright
Copyright (c) 2025-2026 Charles KWON (Charles KWON OhJun) Email: charleskwonohjun@gmail.com All rights reserved.