make host configurable using the solara settings and make the host

and the ports configurable via the command line for pytest.

solara/__main__.py

@@ -27,9 +27,6 @@ def ssg_crawl(*args, **kwargs):  # type: ignore
 
 
 HERE = Path(__file__).parent
-HOST_DEFAULT = os.environ.get("HOST", "localhost")
-if "arm64-apple-darwin" in HOST_DEFAULT:  # conda activate script
-    HOST_DEFAULT = "localhost"
 
 LOGGING_CONFIG: dict = {
     "version": 1,
@@ -121,7 +118,11 @@ def cli():
 
 @cli.command()
 @click.option("--port", default=int(os.environ.get("PORT", 8765)))
-@click.option("--host", default=HOST_DEFAULT)
+@click.option(
+    "--host",
+    default=settings.main.host,
+    help="Host to listen on. Defaults to the $HOST environment or $SOLARA_HOST when available or localhost when not given.",
+)
 @click.option(
     "--dev/--no-dev",
     default=False,
@@ -419,7 +420,7 @@ def ssg_run():
 @cli.command()
 @click.argument("app")
 @click.option("--port", default=int(os.environ.get("PORT", 8765)))
-@click.option("--host", default=HOST_DEFAULT)
+@click.option("--host", default=settings.main.host)
 @click.option(
     "--headed/--no-headed",
     is_flag=True,

solara/server/settings.py

@@ -1,3 +1,4 @@
+import os
 import site
 import sys
 import uuid
@@ -118,6 +119,11 @@ class Config:
         env_file = ".env"
 
 
+HOST_DEFAULT = os.environ.get("HOST", "localhost")
+if "arm64-apple-darwin" in HOST_DEFAULT:  # conda activate script
+    HOST_DEFAULT = "localhost"
+
+
 class MainSettings(pydantic.BaseSettings):
     use_pdb: bool = False
     mode: str = "production"
@@ -126,6 +132,7 @@ class MainSettings(pydantic.BaseSettings):
     root_path: Optional[str] = None  # e.g. /myapp/
     base_url: str = ""  # e.g. https://myapp.solara.run/myapp/
     platform: str = sys.platform
+    host = HOST_DEFAULT
 
     class Config:
         env_prefix = "solara_"

solara/test/pytest_plugin.py

@@ -31,16 +31,16 @@
 
 logger = logging.getLogger("solara.pytest_plugin")
 
-TEST_PORT = int(os.environ.get("PORT", "18765")) + 100  # do not interfere with the solara integration tests
-TEST_HOST = os.environ.get("SOLARA_TEST_HOST", "localhost")
+TEST_PORT_START = int(os.environ.get("PORT", "18765")) + 100  # do not interfere with the solara integration tests
+TEST_HOST = solara.server.settings.main.host
 TIMEOUT = float(os.environ.get("SOLARA_PW_TIMEOUT", "18"))
 
 
 @pytest.fixture(scope="session")
-def solara_server(request):
-    global TEST_PORT
-    webserver = ServerStarlette(TEST_PORT, TEST_HOST)
-    TEST_PORT += 1
+def solara_server(pytestconfig: Any, request):
+    port = pytestconfig.getoption("--solara-port")
+    host = pytestconfig.getoption("--solara-host")
+    webserver = ServerStarlette(port, host)
 
     try:
         webserver.serve_threaded()
@@ -261,12 +261,11 @@ def serve(self):
 
 
 @pytest.fixture(scope="session")
-def voila_server(notebook_path):
-    global TEST_PORT
-    port = TEST_PORT
-    TEST_PORT += 1
+def voila_server(pytestconfig: Any, notebook_path):
+    port = pytestconfig.getoption("--voila-port")
+    host = pytestconfig.getoption("--solara-host")
     write_notebook(["print('hello')"], notebook_path)
-    server = ServerVoila(notebook_path, port, TEST_HOST)
+    server = ServerVoila(notebook_path, port, host)
     try:
         server.serve_threaded()
         server.wait_until_serving()
@@ -276,12 +275,11 @@ def voila_server(notebook_path):
 
 
 @pytest.fixture(scope="session")
-def jupyter_server(notebook_path):
-    global TEST_PORT
-    port = TEST_PORT
-    TEST_PORT += 1
+def jupyter_server(pytestconfig: Any, notebook_path):
+    port = pytestconfig.getoption("--jupyter-port")
+    host = pytestconfig.getoption("--solara-host")
     write_notebook(["print('hello')"], notebook_path)
-    server = ServerJupyter(notebook_path, port, TEST_HOST)
+    server = ServerJupyter(notebook_path, port, host)
     try:
         server.serve_threaded()
         server.wait_until_serving()
@@ -607,3 +605,26 @@ def pytest_addoption(parser: Any) -> None:
         default=False,
         help="On compare failure, store to the reference image. Useful for running in CI and downloading the snapshots.",
     )
+    group.addoption(
+        "--solara-host",
+        default=TEST_HOST,
+        help="Host or IP all servers will bind to (solara, jupyter, voila)",
+    )
+    group.addoption(
+        "--solara-port",
+        type=int,
+        default=TEST_PORT_START + 0,
+        help="Port the solara server is running on for the test",
+    )
+    group.addoption(
+        "--jupyter-port",
+        type=int,
+        default=TEST_PORT_START + 1,
+        help="Port the jupyter server is running on for the test (for classic notebook and juptyer lab)",
+    )
+    group.addoption(
+        "--voila-port",
+        type=int,
+        default=TEST_PORT_START + 2,
+        help="Port the voila server is running on for the test (for classic notebook and juptyer lab)",
+    )

solara/website/pages/docs/content/10-howto/50-testing.md

@@ -131,3 +131,13 @@ After inspecting and approving the screenshots, you can copy them to the `solara
 Visual testing with solara is based on [Playwright for Python](https://playwright.dev/python/), which provides a `page` fixture. However, this fixture will make a new page for each test, which is not what we want. Therefore, we provide a `page_session` fixture that will reuse the same page for all tests. This is important because it will make the tests faster.
 
 By following these recommendations and guidelines, you can efficiently test your Solara applications and ensure a smooth developer experience.
+
+# Configuration
+
+## Changing the Hostname
+
+To configure the hostname the socket is bound to when starting the test server, use the `HOST` or `SOLARA_HOST` environment variable (e.g. `SOLARA_HOST=0.0.0.0`). This hostname is also used for the jupyter server and voila. Alternatively the `--solara-host` argument can be passed on the command line for pytest.
+
+## Changing the Port
+
+To configure the ports the socket is bound to when starting the test servers, use the `PORT` environment variable (e.g. `PORT=18865`). This port and subsequent port will be used for solara-server, jupyter-server and voila. Alternatively the `--solara-port` argument can be passed on the command line for pytest for the solara server, and `--jupyter-port` and `--voila-port` for the ports of jupyter server and voila respectively.