1 files changed, 66 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/flow_control.py b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/flow_control.py
new file mode 100644
index 00000000..df642c7b
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/flow_control.py
@@ -0,0 +1,66 @@
+import asyncio
+
+from uvicorn._types import (
+    ASGIReceiveCallable,
+    ASGISendCallable,
+    HTTPResponseBodyEvent,
+    HTTPResponseStartEvent,
+    Scope,
+)
+
+CLOSE_HEADER = (b"connection", b"close")
+
+HIGH_WATER_LIMIT = 65536
+
+
+class FlowControl:
+    def __init__(self, transport: asyncio.Transport) -> None:
+        self._transport = transport
+        self.read_paused = False
+        self.write_paused = False
+        self._is_writable_event = asyncio.Event()
+        self._is_writable_event.set()
+
+    async def drain(self) -> None:
+        await self._is_writable_event.wait()
+
+    def pause_reading(self) -> None:
+        if not self.read_paused:
+            self.read_paused = True
+            self._transport.pause_reading()
+
+    def resume_reading(self) -> None:
+        if self.read_paused:
+            self.read_paused = False
+            self._transport.resume_reading()
+
+    def pause_writing(self) -> None:
+        if not self.write_paused:
+            self.write_paused = True
+            self._is_writable_event.clear()
+
+    def resume_writing(self) -> None:
+        if self.write_paused:
+            self.write_paused = False
+            self._is_writable_event.set()
+
+
+async def service_unavailable(
+    scope: "Scope", receive: "ASGIReceiveCallable", send: "ASGISendCallable"
+) -> None:
+    response_start: "HTTPResponseStartEvent" = {
+        "type": "http.response.start",
+        "status": 503,
+        "headers": [
+            (b"content-type", b"text/plain; charset=utf-8"),
+            (b"connection", b"close"),
+        ],
+    }
+    await send(response_start)
+
+    response_body: "HTTPResponseBodyEvent" = {
+        "type": "http.response.body",
+        "body": b"Service Unavailable",
+        "more_body": False,
+    }
+    await send(response_body)