microsoft · pavelfeldman · Jul 28, 2020 · Jul 28, 2020 · mxschmitt · Jul 28, 2020
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -72,6 +72,8 @@ jobs:
         PKG_CACHE_PATH: ${{ steps.node-pkg-cache.outputs.dir }}
     - name: Build package
       run: python build_package.py
+    - name: Install
+      run: python -m playwright install
-      run: python -m playwright install
+      run: playwright install
-      run: python -m playwright install
+      run: playwright install
     - name: Test
       run: pytest -vv --browser=${{ matrix.browser }} --junitxml=junit/test-results-${{ matrix.os }}-${{ matrix.python-version }}-${{ matrix.browser }}.xml --cov=playwright --cov-report xml
     - name: Coveralls

diff --git a/playwright/__main__.py b/playwright/__main__.py
@@ -0,0 +1,17 @@
+# Copyright (c) Microsoft Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from playwright.main import main
+
+main()
diff --git a/playwright/browser_type.py b/playwright/browser_type.py
@@ -17,7 +17,7 @@
 from playwright.browser import Browser
 from playwright.browser_context import BrowserContext
 from playwright.connection import ChannelOwner, ConnectionScope, from_channel
-from playwright.helper import ColorScheme, locals_to_params
+from playwright.helper import ColorScheme, locals_to_params, not_installed_error
 
 
 class BrowserType(ChannelOwner):
@@ -49,9 +49,14 @@ async def launch(
         slowMo: int = None,
         chromiumSandbox: bool = None,
     ) -> Browser:
-        return from_channel(
-            await self._channel.send("launch", locals_to_params(locals()))
-        )
+        try:
+            return from_channel(
+                await self._channel.send("launch", locals_to_params(locals()))
+            )
+        except Exception as e:
+            if f"{self.name}-" in str(e):
+                raise not_installed_error(f'"{self.name}" browser was not found.')
+            raise e
 
     async def launchServer(
         self,
@@ -70,9 +75,14 @@ async def launchServer(
         port: int = None,
         chromiumSandbox: bool = None,
     ) -> Browser:
-        return from_channel(
-            await self._channel.send("launchServer", locals_to_params(locals()))
-        )
+        try:
+            return from_channel(
+                await self._channel.send("launchServer", locals_to_params(locals()))
+            )
+        except Exception as e:
+            if f"{self.name}-" in str(e):
+                raise not_installed_error(f'"{self.name}" browser was not found.')
+            raise e
 
     async def launchPersistentContext(
         self,
@@ -108,11 +118,16 @@ async def launchPersistentContext(
         colorScheme: ColorScheme = None,
         acceptDownloads: bool = None,
     ) -> BrowserContext:
-        return from_channel(
-            await self._channel.send(
-                "launchPersistentContext", locals_to_params(locals())
+        try:
+            return from_channel(
+                await self._channel.send(
+                    "launchPersistentContext", locals_to_params(locals())
+                )
             )
-        )
+        except Exception as e:
+            if f"{self.name}-" in str(e):
+                raise not_installed_error(f'"{self.name}" browser was not found.')
+            raise e
 
     async def connect(
         self, wsEndpoint: str = None, slowMo: int = None, timeout: int = None

diff --git a/playwright/helper.py b/playwright/helper.py
@@ -243,3 +243,17 @@ class RouteHandlerEntry:
     def __init__(self, matcher: URLMatcher, handler: RouteHandler):
         self.matcher = matcher
         self.handler = handler
+
+
+def not_installed_error(message: str) -> Exception:
+    return Exception(
+        f"""
+================================================================================
+{message}
+Please complete Playwright installation via running
+
+    "python -m playwright install"
+
+================================================================================
+"""
+    )
diff --git a/playwright/main.py b/playwright/main.py
@@ -25,37 +25,36 @@
 
 from playwright.async_api import Playwright as AsyncPlaywright
 from playwright.connection import Connection
+from playwright.helper import not_installed_error
 from playwright.object_factory import create_remote_object
 from playwright.playwright import Playwright
 from playwright.sync_api import Playwright as SyncPlaywright
 from playwright.sync_base import dispatcher_fiber, set_dispatcher_fiber
 
 
-async def run_driver_async() -> Connection:
-    package_path = os.path.dirname(os.path.abspath(__file__))
+def compute_driver_name() -> str:
     platform = sys.platform
     if platform == "darwin":
-        driver_name = "driver-macos"
+        result = "driver-macos"
     elif platform == "linux":
-        driver_name = "driver-linux"
+        result = "driver-linux"
     elif platform == "win32":
-        driver_name = "driver-win.exe"
+        result = "driver-win.exe"
+    return result
+
+
+async def run_driver_async() -> Connection:
+    package_path = os.path.dirname(os.path.abspath(__file__))
+    driver_name = compute_driver_name()
     driver_executable = os.path.join(package_path, driver_name)
     archive_name = os.path.join(package_path, "drivers", driver_name + ".gz")
 
     if not os.path.exists(driver_executable) or os.path.getmtime(
         driver_executable
     ) < os.path.getmtime(archive_name):
-        with gzip.open(archive_name, "rb") as f_in, open(
-            driver_executable, "wb"
-        ) as f_out:
-            shutil.copyfileobj(f_in, f_out)
-
-    st = os.stat(driver_executable)
-    if st.st_mode & stat.S_IEXEC == 0:
-        os.chmod(driver_executable, st.st_mode | stat.S_IEXEC)
-
-    subprocess.run(f"{driver_executable} install", shell=True)
+        raise not_installed_error(
+            "Playwright requires additional post-installation step to be made."
+        )
 
     proc = await asyncio.create_subprocess_exec(
         driver_executable,
@@ -116,3 +115,32 @@ async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None:
     # Use ProactorEventLoop in 3.7, which is default in 3.8
     loop = asyncio.ProactorEventLoop()
     asyncio.set_event_loop(loop)
+
+
+def main() -> None:
+    if "install" not in sys.argv:
+        print('Run "python -m playwright install" to complete installation')
+        return
+    package_path = os.path.dirname(os.path.abspath(__file__))
+    driver_name = compute_driver_name()
+    driver_executable = os.path.join(package_path, driver_name)
+    archive_name = os.path.join(package_path, "drivers", driver_name + ".gz")
+
+    if not os.path.exists(driver_executable) or os.path.getmtime(
+        driver_executable
+    ) < os.path.getmtime(archive_name):
+        print(f"Extracting {archive_name} into {driver_executable}...")
+        with gzip.open(archive_name, "rb") as f_in, open(
+            driver_executable, "wb"
+        ) as f_out:
+            shutil.copyfileobj(f_in, f_out)
+
+        st = os.stat(driver_executable)
+        if st.st_mode & stat.S_IEXEC == 0:
+            print(f"Making {driver_executable} executable...")
+            os.chmod(driver_executable, st.st_mode | stat.S_IEXEC)
+
+    print("Installing the browsers...")
+    subprocess.run(f"{driver_executable} install", shell=True)
+
+    print("Playwright is now ready for use")