Infer entrypoints from additional filename patterns

CHANGELOG.md

@@ -14,6 +14,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   hosts that should not be accessed via proxy server. It's a comma-separated list
   of host or domain suffixes. For example, specifying `example.com` will
   bypass the proxy for example.com, host.example.com, etc.
+- If an entrypoint is not specified with `--entrypoint`, rsconnect-python will try
+  harder than before to choose an entrypoint file. In addition to the previously
+  recognized filename patterns, the file patterns `app-*.py`, `app_*.py`, `*-app.py`,
+  and `*_app.py` are now considered. However, if the directory contains more than
+  one file matching these new patterns, you must provide rsconnect-python with an
+  explicit `--entrypoint` argument.
 
 ## [1.20.0] - 2023-09-11
 

rsconnect/actions.py

@@ -16,6 +16,7 @@
 from os.path import abspath, basename, dirname, exists, isdir, join, relpath, splitext
 from .exception import RSConnectException
 from . import api
+from . import bundle
 from .bundle import (
     _warn_if_environment_directory,
     _warn_if_no_requirements_file,
@@ -415,21 +416,7 @@ def validate_manifest_file(file_or_directory):
 
 def get_default_entrypoint(directory):
     warn("This method has been moved and will be deprecated.", DeprecationWarning, stacklevel=2)
-    candidates = ["app", "application", "main", "api"]
-    files = set(os.listdir(directory))
-
-    for candidate in candidates:
-        filename = candidate + ".py"
-        if filename in files:
-            return candidate
-
-    # if only one python source file, use it
-    python_files = list(filter(lambda s: s.endswith(".py"), files))
-    if len(python_files) == 1:
-        return python_files[0][:-3]
-
-    logger.warning("Can't determine entrypoint; defaulting to 'app'")
-    return "app"
+    return bundle.get_default_entrypoint(directory)
 
 
 def validate_entry_point(entry_point, directory):

rsconnect/bundle.py

@@ -1404,6 +1404,10 @@ def validate_manifest_file(file_or_directory):
     return file_or_directory
 
 
+re_app_prefix = re.compile(r"^app[-_].+\.py$")
+re_app_suffix = re.compile(r".+[-_]app\.py$")
+
+
 def get_default_entrypoint(directory):
     candidates = ["app", "application", "main", "api"]
     files = set(os.listdir(directory))
@@ -1418,8 +1422,13 @@ def get_default_entrypoint(directory):
     if len(python_files) == 1:
         return python_files[0][:-3]
 
-    logger.warning("Can't determine entrypoint; defaulting to 'app'")
-    return "app"
+    # try app-*.py, app_*.py, *-app.py, *_app.py
+    app_files = list(filter(lambda s: re_app_prefix.match(s) or re_app_suffix.match(s), python_files))
+    if len(app_files) == 1:
+        # In these cases, the app should be in the "app" attribute
+        return app_files[0][:-3] + ":app"
+
+    raise RSConnectException(f"Could not determine default entrypoint file in directory '{directory}'")
 
 
 def validate_entry_point(entry_point, directory):

tests/test_bundle.py

@@ -2,11 +2,11 @@
 import json
 import os
 import pytest
-import shutil
 import subprocess
 import sys
 import tarfile
 import tempfile
+from pathlib import Path
 
 from os.path import dirname, join, basename, abspath
 from unittest import mock, TestCase
@@ -1081,25 +1081,42 @@ def test_validate_title(self):
         _validate_title("1" * 1024)
 
     def test_validate_entry_point(self):
-        directory = tempfile.mkdtemp()
-
-        try:
-            self.assertEqual(validate_entry_point(None, directory), "app")
-            self.assertEqual(validate_entry_point("app", directory), "app")
-            self.assertEqual(validate_entry_point("app:app", directory), "app:app")
-
-            with self.assertRaises(RSConnectException):
-                validate_entry_point("x:y:z", directory)
-
-                with open(join(directory, "onlysource.py"), "w") as f:
-                    f.close()
-                    self.assertEqual(validate_entry_point(None, directory), "onlysource")
-
-                    with open(join(directory, "main.py"), "w") as f:
-                        f.close()
-                        self.assertEqual(validate_entry_point(None, directory), "main")
-        finally:
-            shutil.rmtree(directory)
+        # Simple cases
+        for case in ["app", "application", "main", "api"]:
+            self._entry_point_case(["helper.py", f"{case}.py"], None, case)
+
+        # app patterns; these differ because they come back with ":app"
+        for case in ["app-example", "app_example", "example-app", "example_app"]:
+            self._entry_point_case(["helper.py", f"{case}.py"], None, f"{case}:app")
+
+        # only one Python file means we assume it's the entrypoint
+        self._entry_point_case(["onlysource.py"], None, "onlysource")
+
+        # Explicit entrypoint specifiers, no need to infer
+        self._entry_point_case(["helper.py", "app.py"], "app", "app")
+        self._entry_point_case(["helper.py", "app.py"], "app:app", "app:app")
+        self._entry_point_case(["helper.py", "app.py"], "foo:bar", "foo:bar")
+
+    def test_validate_entry_point_failure(self):
+        # Invalid entrypoint specifier
+        self._entry_point_case(["app.py"], "x:y:z", False)
+        # Nothing relevant found
+        self._entry_point_case(["one.py", "two.py"], "x:y:z", False)
+        # Too many app-*.py files
+        self._entry_point_case(["app-one.py", "app-two.py"], "x:y:z", False)
+
+    def _entry_point_case(self, files, entry_point, expected):
+        with tempfile.TemporaryDirectory() as directory:
+            dir = Path(directory)
+
+            for file in files:
+                (dir / file).touch()
+
+            if expected is False:
+                with self.assertRaises(RSConnectException):
+                    validate_entry_point(entry_point, directory)
+            else:
+                self.assertEqual(validate_entry_point(entry_point, directory), expected)
 
     def test_default_title(self):
         self.assertEqual(_default_title("testing.txt"), "testing")