Marius CiepluchandClaude Opus 5 7e3f12bc00 feat(cpg): add a transaction-owned engine session and route it opt-in (M2 11.1, 11.3) ...

JVM startup, not analysis, is what a push scan spends its time on: each disposable
script invocation costs 13 to 23 seconds while the work takes under a second.

The session owns one Joern server per transaction on loopback with an OS-chosen
port and no published port. Three properties are load-bearing, and the probe that
settled the design demonstrated why each is needed.

An HTTP status is not an answer. The server returns success even for a compile
error, with the diagnostic in its body, so every request redirects the evaluated
code's console output into a fresh private file behind a nonce, and the nonce is
verified before the answer is accepted. The engine's body is retained for exactly
the case where the receipt is missing, without which that failure explains nothing.

A poisoned session answers nothing afterwards, and cancellation kills the process
group rather than the launcher, which this project has already run a machine out of
memory by neglecting.

What the probe established about the engine, after three iterations that each
failed loudly: runScript is absent from the server REPL; a shipped @main script
cannot be nested in a block expression, so definitions go to the top level
unwrapped; and the REPL shadows Console with io.joern.console.Console, which has no
withOut, so capture must qualify scala.Console. With that fixed, both mechanisms
answer identically to the disposable invocation, 0.8 s against 9.8 s.

The backend routes batch and single queries through the session only when
session_transport is enabled, which it is not by default. Any failure falls back to
the disposable invocation rather than reporting a zero, and each script is defined
under its own name because every script declares exec.

Equivalence for taint, dominance and configuration is task 11.2 and gates any
measured run. 1,391 tests passed, nine skipped. Rollout stays NO-GO.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo

2026-09-16 20:24:34 +02:00

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