feat(cli): migrate the uipath server runtime channel from HTTP to uipath-ipc [ROBO-5779]

[eduard-dumitru]

Draft — Phase 1 (RPC) of migrating the LowCode Python-runtime channel from HTTP to uipath-ipc. Coordinated with a matching hdens/.NET executor change (not yet open). Not for merge yet — see Open items.

What

Replaces the HTTP/socket channel (Unix-socket + TCP + ready-ACK) for the pre-warmed Python runtime with a uipath-ipc named-pipe server. uipath server --pipe-name <name> now hosts IPythonRuntimeServer (Ping / StartJob / CancelJob) over a named pipe — a $TMPDIR/CoreFxPipe_<name> UDS on Linux, a Win32 pipe on Windows — which the .NET job executor connects to as the client. This unifies today's UDS-on-Linux / TCP-on-Windows split into one primitive.

Changes

• cli_server.py — IPythonRuntimeServer contract + PythonRuntimeService, served by IpcServer over NamedPipeServerTransport, keeping the existing per-job os.environ/cwd isolation. DTOs cross as plain PascalCase dicts (matching the .NET DTOs). StartJob is @ipc_cancellable; CancelJob and a host-cancelled StartJob set a per-job threading.Event exposed via get_current_cancellation() (cooperative, best-effort). The server command takes a required --pipe-name and runs on a Windows Proactor loop (named pipes require it). Removes the entire HTTP path — start_unix_server/start_tcp_server, create_app, the request handlers, host-validation, send_ack, the SOCKET_ENV_VAR/DEFAULT_SOCKET_PATH/DEFAULT_PORT/generate_socket_path symbols, and the --client-socket/--server-socket/--port/--tcp options.
• pyproject.toml — adds the uipath-ipc dependency, pinned via [tool.uv.sources] + [[tool.uv.index]] to the (anonymously accessible) UiPath-Internal Azure Artifacts feed so uv/CI can resolve it.
• tests — replaces the HTTP test_server.py with test_server_ipc.py, driving the IPC server over a pipe (Ping/StartJob/CancelJob, env isolation, cooperative cancel).

Verified locally

uv sync installs everything (incl. uipath-ipc from the anonymous feed), and uipath server --pipe-name demo runs while a client round-trips Ping ({Status: ready, RuntimeVersion: 2.11.18}) and CancelJob over a real named pipe.

Open items / follow-ups (why this is a draft)

• Distribution — the shipped wheel declares uipath-ipc>=2.5.1, which currently lives only on the UiPath-Internal feed (not PyPI). A public pip install uipath needs it resolvable, so this needs a decision: publish uipath-ipc to PyPI, or make it an optional extra. The [tool.uv.*] config only unblocks uv/CI resolution — it is not baked into the wheel.
• .NET executor (PR A) — the matching hdens change (spawn uipath server --pipe-name, IpcClient proxy, Ping readiness) is required for full end-to-end.
• Cooperative cancel — making run/debug/eval + the agent actually poll get_current_cancellation() to stop early is a runtime-side follow-up (a non-cooperating job runs to completion, as before).
• Logs — still file-tailed (execution.log); moving them onto IPC is Phase 2.

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate failed

Failed conditions
73.8% Coverage on New Code (required ≥ 90%)

See analysis details on SonarQube Cloud