microsoft · pavelfeldman · Jul 2, 2021 · Jun 25, 2021 · Jun 28, 2021
diff --git a/playwright/_impl/_browser.py b/playwright/_impl/_browser.py
@@ -31,6 +31,7 @@
 from playwright._impl._helper import (
     ColorScheme,
     ReducedMotion,
+    async_readfile,
     is_safe_close_error,
     locals_to_params,
 )
@@ -106,7 +107,7 @@ async def new_context(
         storageState: Union[StorageState, str, Path] = None,
     ) -> BrowserContext:
         params = locals_to_params(locals())
-        normalize_context_params(self._connection._is_sync, params)
+        await normalize_context_params(self._connection._is_sync, params)
 
         channel = await self._channel.send("newContext", params)
         context = from_channel(channel)
@@ -190,7 +191,7 @@ async def stop_tracing(self) -> bytes:
         return base64.b64decode(encoded_binary)
 
 
-def normalize_context_params(is_sync: bool, params: Dict) -> None:
+async def normalize_context_params(is_sync: bool, params: Dict) -> None:
     params["sdkLanguage"] = "python" if is_sync else "python-async"
     if params.get("noViewport"):
         del params["noViewport"]
@@ -214,5 +215,6 @@ def normalize_context_params(is_sync: bool, params: Dict) -> None:
     if "storageState" in params:
         storageState = params["storageState"]
         if not isinstance(storageState, dict):
-            with open(storageState, "r") as f:
-                params["storageState"] = json.load(f)
+            params["storageState"] = json.loads(
+                (await async_readfile(storageState)).decode()
+            )
diff --git a/playwright/_impl/_browser_context.py b/playwright/_impl/_browser_context.py
@@ -34,6 +34,8 @@
     TimeoutSettings,
     URLMatch,
     URLMatcher,
+    async_readfile,
+    async_writefile,
     is_safe_close_error,
     locals_to_params,
 )
@@ -214,8 +216,7 @@ async def add_init_script(
         self, script: str = None, path: Union[str, Path] = None
     ) -> None:
         if path:
-            with open(path, "r") as file:
-                script = file.read()
+            script = (await async_readfile(path)).decode()
         if not isinstance(script, str):
             raise Error("Either path or script parameter must be specified")
         await self._channel.send("addInitScript", dict(source=script))
@@ -298,8 +299,7 @@ async def _pause(self) -> None:
     async def storage_state(self, path: Union[str, Path] = None) -> StorageState:
         result = await self._channel.send_return_as_dict("storageState")
         if path:
-            with open(path, "w") as f:
-                json.dump(result, f)
+            await async_writefile(path, json.dumps(result))
         return result
 
     async def wait_for_event(

diff --git a/playwright/_impl/_browser_type.py b/playwright/_impl/_browser_type.py
@@ -135,7 +135,7 @@ async def launch_persistent_context(
     ) -> BrowserContext:
         userDataDir = str(Path(userDataDir))
         params = locals_to_params(locals())
-        normalize_context_params(self._connection._is_sync, params)
+        await normalize_context_params(self._connection._is_sync, params)
         normalize_launch_params(params)
         try:
             context = from_channel(

diff --git a/playwright/_impl/_element_handle.py b/playwright/_impl/_element_handle.py
@@ -23,6 +23,7 @@
 from playwright._impl._helper import (
     KeyboardModifier,
     MouseButton,
+    async_writefile,
     locals_to_params,
     make_dirs_for_file,
 )
@@ -179,7 +180,7 @@ async def set_input_files(
         noWaitAfter: bool = None,
     ) -> None:
         params = locals_to_params(locals())
-        params["files"] = normalize_file_payloads(files)
+        params["files"] = await normalize_file_payloads(files)
         await self._channel.send("setInputFiles", params)
 
     async def focus(self) -> None:
@@ -241,8 +242,7 @@ async def screenshot(
         decoded_binary = base64.b64decode(encoded_binary)
         if path:
             make_dirs_for_file(path)
-            with open(path, "wb") as fd:
-                fd.write(decoded_binary)
+            await async_writefile(path, decoded_binary)
         return decoded_binary
 
     async def query_selector(self, selector: str) -> Optional["ElementHandle"]:

diff --git a/playwright/_impl/_file_chooser.py b/playwright/_impl/_file_chooser.py
@@ -18,6 +18,7 @@
 from typing import TYPE_CHECKING, List, Union
 
 from playwright._impl._api_structures import FilePayload
+from playwright._impl._helper import async_readfile
 
 if TYPE_CHECKING:  # pragma: no cover
     from playwright._impl._element_handle import ElementHandle
@@ -57,20 +58,19 @@ async def set_files(
         await self._element_handle.set_input_files(files, timeout, noWaitAfter)
 
 
-def normalize_file_payloads(
+async def normalize_file_payloads(
     files: Union[str, Path, FilePayload, List[Union[str, Path]], List[FilePayload]]
 ) -> List:
     file_list = files if isinstance(files, list) else [files]
     file_payloads: List = []
     for item in file_list:
-        if isinstance(item, str) or isinstance(item, Path):
-            with open(item, mode="rb") as fd:
-                file_payloads.append(
-                    {
-                        "name": os.path.basename(item),
-                        "buffer": base64.b64encode(fd.read()).decode(),
-                    }
-                )
+        if isinstance(item, (str, Path)):
+            file_payloads.append(
+                {
+                    "name": os.path.basename(item),
+                    "buffer": base64.b64encode(await async_readfile(item)).decode(),
+                }
+            )
         else:
             file_payloads.append(
                 {

diff --git a/playwright/_impl/_frame.py b/playwright/_impl/_frame.py
@@ -36,6 +36,7 @@
     MouseButton,
     URLMatch,
     URLMatcher,
+    async_readfile,
     locals_to_params,
     monotonic_time,
 )
@@ -360,21 +361,26 @@ async def add_script_tag(
     ) -> ElementHandle:
         params = locals_to_params(locals())
         if path:
-            with open(path, "r") as file:
-                params["content"] = file.read() + "\n//# sourceURL=" + str(Path(path))
-                del params["path"]
+            params["content"] = (
+                (await async_readfile(path)).decode()
+                + "\n//# sourceURL="
+                + str(Path(path))
+            )
+            del params["path"]
         return from_channel(await self._channel.send("addScriptTag", params))
 
     async def add_style_tag(
         self, url: str = None, path: Union[str, Path] = None, content: str = None
     ) -> ElementHandle:
         params = locals_to_params(locals())
         if path:
-            with open(path, "r") as file:
-                params["content"] = (
-                    file.read() + "\n/*# sourceURL=" + str(Path(path)) + "*/"
-                )
-                del params["path"]
+            params["content"] = (
+                (await async_readfile(path)).decode()
+                + "\n/*# sourceURL="
+                + str(Path(path))
+                + "*/"
+            )
+            del params["path"]
         return from_channel(await self._channel.send("addStyleTag", params))
 
     async def click(
@@ -479,7 +485,7 @@ async def set_input_files(
         noWaitAfter: bool = None,
     ) -> None:
         params = locals_to_params(locals())
-        params["files"] = normalize_file_payloads(files)
+        params["files"] = await normalize_file_payloads(files)
         await self._channel.send("setInputFiles", params)
 
     async def type(

diff --git a/playwright/_impl/_helper.py b/playwright/_impl/_helper.py
@@ -11,7 +11,7 @@
 # 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.
-
+import asyncio
 import fnmatch
 import math
 import os
@@ -231,3 +231,21 @@ def make_dirs_for_file(path: Union[Path, str]) -> None:
     if not os.path.isabs(path):
         path = Path.cwd() / path
     os.makedirs(os.path.dirname(path), exist_ok=True)
+
+
+async def async_writefile(file: Union[str, Path], data: Union[str, bytes]) -> None:
+    def inner() -> None:
+        with open(file, "w" if isinstance(data, str) else "wb") as fh:
+            fh.write(data)
+
+    loop = asyncio.get_running_loop()
+    await loop.run_in_executor(None, inner)
+
+
+async def async_readfile(file: Union[str, Path]) -> bytes:
+    def inner() -> bytes:
+        with open(file, "rb") as fh:
+            return fh.read()
+
+    loop = asyncio.get_running_loop()
+    return await loop.run_in_executor(None, inner)
diff --git a/playwright/_impl/_page.py b/playwright/_impl/_page.py
@@ -54,6 +54,8 @@
     URLMatcher,
     URLMatchRequest,
     URLMatchResponse,
+    async_readfile,
+    async_writefile,
     is_safe_close_error,
     locals_to_params,
     make_dirs_for_file,
@@ -498,8 +500,7 @@ async def add_init_script(
         self, script: str = None, path: Union[str, Path] = None
     ) -> None:
         if path:
-            with open(path, "r") as file:
-                script = file.read()
+            script = (await async_readfile(path)).decode()
         if not isinstance(script, str):
             raise Error("Either path or script parameter must be specified")
         await self._channel.send("addInitScript", dict(source=script))
@@ -542,8 +543,7 @@ async def screenshot(
         decoded_binary = base64.b64decode(encoded_binary)
         if path:
             make_dirs_for_file(path)
-            with open(path, "wb") as fd:
-                fd.write(decoded_binary)
+            await async_writefile(path, decoded_binary)
         return decoded_binary
 
     async def title(self) -> str:
@@ -741,8 +741,7 @@ async def pdf(
         decoded_binary = base64.b64decode(encoded_binary)
         if path:
             make_dirs_for_file(path)
-            with open(path, "wb") as fd:
-                fd.write(decoded_binary)
+            await async_writefile(path, decoded_binary)
         return decoded_binary
 
     @property

diff --git a/playwright/_impl/_selectors.py b/playwright/_impl/_selectors.py
@@ -17,6 +17,7 @@
 
 from playwright._impl._api_types import Error
 from playwright._impl._connection import ChannelOwner
+from playwright._impl._helper import async_readfile
 
 
 class Selectors(ChannelOwner):
@@ -35,8 +36,7 @@ async def register(
         if not script and not path:
             raise Error("Either source or path should be specified")
         if path:
-            with open(path, "r") as file:
-                script = file.read()
+            script = (await async_readfile(path)).decode()
         params: Dict = dict(name=name, source=script)
         if contentScript:
             params["contentScript"] = True

diff --git a/playwright/_impl/_stream.py b/playwright/_impl/_stream.py
@@ -26,9 +26,12 @@ def __init__(
         super().__init__(parent, type, guid, initializer)
 
     async def save_as(self, path: Union[str, Path]) -> None:
-        with open(path, mode="wb") as file:
-            while True:
-                binary = await self._channel.send("read")
-                if not binary:
-                    break
-                file.write(base64.b64decode(binary))
+        file = await self._loop.run_in_executor(None, lambda: open(path, "wb"))
+        while True:
+            binary = await self._channel.send("read")
+            if not binary:
+                break
+            await self._loop.run_in_executor(
+                None, lambda: file.write(base64.b64decode(binary))
+            )
+        await self._loop.run_in_executor(None, lambda: file.close())