add command-line options for Uvicorn server configuration

README.md

@@ -41,10 +41,21 @@ siteharbor
 
 Open `http://127.0.0.1:8787`.
 
+The `siteharbor` command runs the FastAPI application with Uvicorn. Override the bind port and
+start multiple Uvicorn worker processes when needed:
+
+```powershell
+siteharbor --port 9000 --workers 2
+```
+
+`--port` accepts ports from 1 through 65535 and overrides `SITEHARBOR_PORT`. `--workers` defaults
+to 1 and controls Uvicorn processes, not the capture-worker count configured by
+`SITEHARBOR_WORKER_CONCURRENCY`.
+
 To use Uvicorn directly:
 
 ```powershell
-python -m uvicorn app.main:app --host 127.0.0.1 --port 8787
+python -m uvicorn app.main:app --host 127.0.0.1 --port 8787 --workers 2
 ```
 
 The default bind address is loopback. Do not expose SiteHarbor directly to the public Internet without authentication, a network egress policy, rate limits, and operational controls.
@@ -56,9 +67,9 @@ All configuration uses environment variables prefixed with `SITEHARBOR_`.
 | Variable | Default | Purpose |
 | --- | --- | --- |
 | `SITEHARBOR_HOST` | `127.0.0.1` | Bind address used by `siteharbor`. |
-| `SITEHARBOR_PORT` | `8787` | Bind port used by `siteharbor`. |
+| `SITEHARBOR_PORT` | `8787` | Default bind port used by `siteharbor`; overridden by `--port`. |
 | `SITEHARBOR_DATA_DIR` | `./data` | SQLite database, work directories, artifacts, and reports. |
-| `SITEHARBOR_WORKER_CONCURRENCY` | `1` | Capture workers per application process. |
+| `SITEHARBOR_WORKER_CONCURRENCY` | `1` | Capture workers per Uvicorn process; separate from `--workers`. |
 | `SITEHARBOR_FETCH_CONCURRENCY` | `6` | Maximum parallel fetches a visitor may select for one capture. |
 | `SITEHARBOR_LEASE_SECONDS` | `120` | SQLite worker lease duration; values below 15 seconds are rejected. |
 | `SITEHARBOR_ALLOW_PRIVATE_NETWORKS` | `false` | Development-only override that permits loopback and private hosts. |

app/main.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import argparse
 import asyncio
 import json
 import re
@@ -387,8 +388,51 @@ def _safe_data_file(path_value: str, root: Path) -> Path | None:
     return None
 
 
-def run() -> None:
+def _positive_integer(value: str) -> int:
-    uvicorn.run("app.main:app", host=settings.host, port=settings.port, reload=False)
+    try:
+        number = int(value)
+    except ValueError as error:
+        raise argparse.ArgumentTypeError("must be a whole number") from error
+    if number < 1:
+        raise argparse.ArgumentTypeError("must be at least 1")
+    return number
+
+
+def _port_number(value: str) -> int:
+    port = _positive_integer(value)
+    if port > 65_535:
+        raise argparse.ArgumentTypeError("must be between 1 and 65535")
+    return port
+
+
+def _parse_server_arguments(argv: list[str] | None = None) -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description="Run the SiteHarbor FastAPI server with Uvicorn.")
+    parser.add_argument(
+        "--port",
+        type=_port_number,
+        default=settings.port,
+        metavar="PORT",
+        help=f"bind port (default: SITEHARBOR_PORT or {settings.port})",
+    )
+    parser.add_argument(
+        "--workers",
+        type=_positive_integer,
+        default=1,
+        metavar="WORKERS",
+        help="number of Uvicorn worker processes (default: 1)",
+    )
+    return parser.parse_args(argv)
+
+
+def run(argv: list[str] | None = None) -> None:
+    arguments = _parse_server_arguments(argv)
+    uvicorn.run(
+        "app.main:app",
+        host=settings.host,
+        port=arguments.port,
+        workers=arguments.workers,
+        reload=False,
+    )
 
 
 if __name__ == "__main__":

tests/test_main.py

@@ -65,3 +65,26 @@ def test_capture_routes_are_scoped_to_the_browser_session(tmp_path, monkeypatch)
         stats = client.get("/api/stats")
         assert stats.status_code == 200
         assert stats.json()["active_crawls"] == 1
+
+
+def test_run_forwards_server_options_to_uvicorn(monkeypatch) -> None:
+    calls: list[tuple[tuple[object, ...], dict[str, object]]] = []
+
+    def fake_run(*args: object, **kwargs: object) -> None:
+        calls.append((args, kwargs))
+
+    monkeypatch.setattr(main.uvicorn, "run", fake_run)
+
+    main.run(["--port", "9123", "--workers", "2"])
+
+    assert calls == [
+        (
+            ("app.main:app",),
+            {
+                "host": settings.host,
+                "port": 9123,
+                "workers": 2,
+                "reload": False,
+            },
+        )
+    ]