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/opentelemetry/baggage/propagation/__init__.py

@@ -0,0 +1,146 @@
+# Copyright The OpenTelemetry Authors
+#
+# 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 logging import getLogger
+from re import split
+from typing import Iterable, List, Mapping, Optional, Set
+from urllib.parse import quote_plus, unquote_plus
+
+from opentelemetry.baggage import _is_valid_pair, get_all, set_baggage
+from opentelemetry.context import get_current
+from opentelemetry.context.context import Context
+from opentelemetry.propagators import textmap
+from opentelemetry.util.re import _DELIMITER_PATTERN
+
+_logger = getLogger(__name__)
+
+
+class W3CBaggagePropagator(textmap.TextMapPropagator):
+    """Extracts and injects Baggage which is used to annotate telemetry."""
+
+    _MAX_HEADER_LENGTH = 8192
+    _MAX_PAIR_LENGTH = 4096
+    _MAX_PAIRS = 180
+    _BAGGAGE_HEADER_NAME = "baggage"
+
+    def extract(
+        self,
+        carrier: textmap.CarrierT,
+        context: Optional[Context] = None,
+        getter: textmap.Getter[textmap.CarrierT] = textmap.default_getter,
+    ) -> Context:
+        """Extract Baggage from the carrier.
+
+        See
+        `opentelemetry.propagators.textmap.TextMapPropagator.extract`
+        """
+
+        if context is None:
+            context = get_current()
+
+        header = _extract_first_element(
+            getter.get(carrier, self._BAGGAGE_HEADER_NAME)
+        )
+
+        if not header:
+            return context
+
+        if len(header) > self._MAX_HEADER_LENGTH:
+            _logger.warning(
+                "Baggage header `%s` exceeded the maximum number of bytes per baggage-string",
+                header,
+            )
+            return context
+
+        baggage_entries: List[str] = split(_DELIMITER_PATTERN, header)
+        total_baggage_entries = self._MAX_PAIRS
+
+        if len(baggage_entries) > self._MAX_PAIRS:
+            _logger.warning(
+                "Baggage header `%s` exceeded the maximum number of list-members",
+                header,
+            )
+
+        for entry in baggage_entries:
+            if len(entry) > self._MAX_PAIR_LENGTH:
+                _logger.warning(
+                    "Baggage entry `%s` exceeded the maximum number of bytes per list-member",
+                    entry,
+                )
+                continue
+            if not entry:  # empty string
+                continue
+            try:
+                name, value = entry.split("=", 1)
+            except Exception:  # pylint: disable=broad-exception-caught
+                _logger.warning(
+                    "Baggage list-member `%s` doesn't match the format", entry
+                )
+                continue
+
+            if not _is_valid_pair(name, value):
+                _logger.warning("Invalid baggage entry: `%s`", entry)
+                continue
+
+            name = unquote_plus(name).strip()
+            value = unquote_plus(value).strip()
+
+            context = set_baggage(
+                name,
+                value,
+                context=context,
+            )
+            total_baggage_entries -= 1
+            if total_baggage_entries == 0:
+                break
+
+        return context
+
+    def inject(
+        self,
+        carrier: textmap.CarrierT,
+        context: Optional[Context] = None,
+        setter: textmap.Setter[textmap.CarrierT] = textmap.default_setter,
+    ) -> None:
+        """Injects Baggage into the carrier.
+
+        See
+        `opentelemetry.propagators.textmap.TextMapPropagator.inject`
+        """
+        baggage_entries = get_all(context=context)
+        if not baggage_entries:
+            return
+
+        baggage_string = _format_baggage(baggage_entries)
+        setter.set(carrier, self._BAGGAGE_HEADER_NAME, baggage_string)
+
+    @property
+    def fields(self) -> Set[str]:
+        """Returns a set with the fields set in `inject`."""
+        return {self._BAGGAGE_HEADER_NAME}
+
+
+def _format_baggage(baggage_entries: Mapping[str, object]) -> str:
+    return ",".join(
+        quote_plus(str(key)) + "=" + quote_plus(str(value))
+        for key, value in baggage_entries.items()
+    )
+
+
+def _extract_first_element(
+    items: Optional[Iterable[textmap.CarrierT]],
+) -> Optional[textmap.CarrierT]:
+    if items is None:
+        return None
+    return next(iter(items), None)