chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/httpx_sse/__init__.py

@@ -0,0 +1,14 @@
+from ._api import EventSource, aconnect_sse, connect_sse
+from ._exceptions import SSEError
+from ._models import ServerSentEvent
+
+__version__ = "0.4.3"
+
+__all__ = [
+    "__version__",
+    "EventSource",
+    "connect_sse",
+    "aconnect_sse",
+    "ServerSentEvent",
+    "SSEError",
+]

backend_service/venv/lib/python3.13/site-packages/httpx_sse/_api.py

@@ -0,0 +1,93 @@
+from collections.abc import AsyncGenerator
+from contextlib import asynccontextmanager, contextmanager
+from typing import Any, AsyncIterator, Iterator, cast
+
+import httpx
+
+from ._decoders import SSEDecoder, SSELineDecoder
+from ._exceptions import SSEError
+from ._models import ServerSentEvent
+
+
+class EventSource:
+    def __init__(self, response: httpx.Response) -> None:
+        self._response = response
+
+    def _check_content_type(self) -> None:
+        content_type = self._response.headers.get("content-type", "").partition(";")[0]
+        if "text/event-stream" not in content_type:
+            raise SSEError(
+                "Expected response header Content-Type to contain 'text/event-stream', "
+                f"got {content_type!r}"
+            )
+
+    @property
+    def response(self) -> httpx.Response:
+        return self._response
+
+    def iter_sse(self) -> Iterator[ServerSentEvent]:
+        self._check_content_type()
+        decoder = SSEDecoder()
+        for line in _iter_sse_lines(self._response):
+            line = line.rstrip("\n")
+            sse = decoder.decode(line)
+            if sse is not None:
+                yield sse
+
+    async def aiter_sse(self) -> AsyncGenerator[ServerSentEvent, None]:
+        self._check_content_type()
+        decoder = SSEDecoder()
+        lines = cast(AsyncGenerator[str, None], _aiter_sse_lines(self._response))
+        try:
+            async for line in lines:
+                line = line.rstrip("\n")
+                sse = decoder.decode(line)
+                if sse is not None:
+                    yield sse
+        finally:
+            await lines.aclose()
+
+
+@contextmanager
+def connect_sse(
+    client: httpx.Client, method: str, url: str, **kwargs: Any
+) -> Iterator[EventSource]:
+    headers = kwargs.pop("headers", {})
+    headers["Accept"] = "text/event-stream"
+    headers["Cache-Control"] = "no-store"
+
+    with client.stream(method, url, headers=headers, **kwargs) as response:
+        yield EventSource(response)
+
+
+@asynccontextmanager
+async def aconnect_sse(
+    client: httpx.AsyncClient,
+    method: str,
+    url: str,
+    **kwargs: Any,
+) -> AsyncIterator[EventSource]:
+    headers = kwargs.pop("headers", {})
+    headers["Accept"] = "text/event-stream"
+    headers["Cache-Control"] = "no-store"
+
+    async with client.stream(method, url, headers=headers, **kwargs) as response:
+        yield EventSource(response)
+
+
+async def _aiter_sse_lines(response: httpx.Response) -> AsyncIterator[str]:
+    decoder = SSELineDecoder()
+    async for text in response.aiter_text():
+        for line in decoder.decode(text):
+            yield line
+    for line in decoder.flush():
+        yield line
+
+
+def _iter_sse_lines(response: httpx.Response) -> Iterator[str]:
+    decoder = SSELineDecoder()
+    for text in response.iter_text():
+        for line in decoder.decode(text):
+            yield line
+    for line in decoder.flush():
+        yield line

backend_service/venv/lib/python3.13/site-packages/httpx_sse/_decoders.py

@@ -0,0 +1,139 @@
+from typing import List, Optional
+
+from ._models import ServerSentEvent
+
+
+def _splitlines_sse(text: str) -> List[str]:
+    """Split text on \r\n, \r, or \n only."""
+    if not text:
+        return []
+
+    if "\r" not in text:
+        lines = text.split("\n")
+    else:
+        normalized = text.replace("\r\n", "\n").replace("\r", "\n")
+        lines = normalized.split("\n")
+
+    if text[-1] in "\r\n":
+        lines.pop()
+
+    return lines
+
+
+class SSELineDecoder:
+    """
+    Handles incrementally reading lines from text.
+
+    Mostly a copy of httpx._decoders.LineDecoder, but as per SSE spec, only \r\n, \r,
+    and \n are treated as newlines, which differs from the behavior of splitlines()
+    used by httpx._decoders.LineDecoder.
+    """
+
+    def __init__(self) -> None:
+        self.buffer: list[str] = []
+        self.trailing_cr: bool = False
+
+    def decode(self, text: str) -> list[str]:
+        # We always push a trailing `\r` into the next decode iteration.
+        if self.trailing_cr:
+            text = "\r" + text
+            self.trailing_cr = False
+        if text.endswith("\r"):
+            self.trailing_cr = True
+            text = text[:-1]
+
+        if not text:
+            # NOTE: the edge case input of empty text doesn't occur in practice,
+            # because other httpx internals filter out this value
+            return []  # pragma: no cover
+
+        trailing_newline = text[-1] in "\n\r"
+        lines = _splitlines_sse(text)
+
+        if len(lines) == 1 and not trailing_newline:
+            # No new lines, buffer the input and continue.
+            self.buffer.append(lines[0])
+            return []
+
+        if self.buffer:
+            # Include any existing buffer in the first portion of the
+            # splitlines result.
+            lines = ["".join(self.buffer) + lines[0]] + lines[1:]
+            self.buffer = []
+
+        if not trailing_newline:
+            # If the last segment of splitlines is not newline terminated,
+            # then drop it from our output and start a new buffer.
+            self.buffer = [lines.pop()]
+
+        return lines
+
+    def flush(self) -> list[str]:
+        if not self.buffer and not self.trailing_cr:
+            return []
+
+        lines = ["".join(self.buffer)]
+        self.buffer = []
+        self.trailing_cr = False
+        return lines
+
+
+class SSEDecoder:
+    def __init__(self) -> None:
+        self._event = ""
+        self._data: List[str] = []
+        self._last_event_id = ""
+        self._retry: Optional[int] = None
+
+    def decode(self, line: str) -> Optional[ServerSentEvent]:
+        # See: https://html.spec.whatwg.org/multipage/server-sent-events.html#event-stream-interpretation  # noqa: E501
+
+        if not line:
+            if (
+                not self._event
+                and not self._data
+                and not self._last_event_id
+                and self._retry is None
+            ):
+                return None
+
+            sse = ServerSentEvent(
+                event=self._event,
+                data="\n".join(self._data),
+                id=self._last_event_id,
+                retry=self._retry,
+            )
+
+            # NOTE: as per the SSE spec, do not reset last_event_id.
+            self._event = ""
+            self._data = []
+            self._retry = None
+
+            return sse
+
+        if line.startswith(":"):
+            return None
+
+        fieldname, _, value = line.partition(":")
+
+        if value.startswith(" "):
+            value = value[1:]
+
+        if fieldname == "event":
+            self._event = value
+        elif fieldname == "data":
+            self._data.append(value)
+        elif fieldname == "id":
+            if "\0" in value:
+                pass
+            else:
+                self._last_event_id = value
+        elif fieldname == "retry":
+            try:
+                self._retry = int(value)
+            except (TypeError, ValueError):
+                pass
+        else:
+            pass  # Field is ignored.
+
+        return None

backend_service/venv/lib/python3.13/site-packages/httpx_sse/_exceptions.py

@@ -0,0 +1,5 @@
+import httpx
+
+
+class SSEError(httpx.TransportError):
+    pass

backend_service/venv/lib/python3.13/site-packages/httpx_sse/_models.py

@@ -0,0 +1,54 @@
+import json
+from typing import Any, Optional
+
+
+class ServerSentEvent:
+    def __init__(
+        self,
+        event: Optional[str] = None,
+        data: Optional[str] = None,
+        id: Optional[str] = None,
+        retry: Optional[int] = None,
+    ) -> None:
+        if not event:
+            event = "message"
+
+        if data is None:
+            data = ""
+
+        if id is None:
+            id = ""
+
+        self._event = event
+        self._data = data
+        self._id = id
+        self._retry = retry
+
+    @property
+    def event(self) -> str:
+        return self._event
+
+    @property
+    def data(self) -> str:
+        return self._data
+
+    @property
+    def id(self) -> str:
+        return self._id
+
+    @property
+    def retry(self) -> Optional[int]:
+        return self._retry
+
+    def json(self) -> Any:
+        return json.loads(self.data)
+
+    def __repr__(self) -> str:
+        pieces = [f"event={self.event!r}"]
+        if self.data != "":
+            pieces.append(f"data={self.data!r}")
+        if self.id != "":
+            pieces.append(f"id={self.id!r}")
+        if self.retry is not None:
+            pieces.append(f"retry={self.retry!r}")
+        return f"ServerSentEvent({', '.join(pieces)})"