Files
Aether/src/api/handlers/base/utils.py
fawney19 ad1c8c394c refactor(handler): optimize stream processing and telemetry pipeline
- Enhance stream context for better token and latency tracking
- Refactor stream processor for improved performance metrics
- Improve telemetry integration with first_byte_time_ms support
- Add comprehensive stream context unit tests
2025-12-16 02:39:03 +08:00

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"""
Handler 基础工具函数
"""
from typing import Any, Dict, Optional
def extract_cache_creation_tokens(usage: Dict[str, Any]) -> int:
"""
提取缓存创建 tokens兼容新旧格式
Claude API 在不同版本中使用了不同的字段名来表示缓存创建 tokens
- 新格式2024年后使用 claude_cache_creation_5_m_tokens 和
claude_cache_creation_1_h_tokens 分别表示 5 分钟和 1 小时缓存
- 旧格式:使用 cache_creation_input_tokens 表示总的缓存创建 tokens
此函数自动检测并适配两种格式,优先使用新格式。
Args:
usage: API 响应中的 usage 字典
Returns:
缓存创建 tokens 总数
"""
# 检查新格式字段是否存在(而非值是否为 0
# 如果字段存在,即使值为 0 也是合法的,不应 fallback 到旧格式
has_new_format = (
"claude_cache_creation_5_m_tokens" in usage
or "claude_cache_creation_1_h_tokens" in usage
)
if has_new_format:
cache_5m = usage.get("claude_cache_creation_5_m_tokens", 0)
cache_1h = usage.get("claude_cache_creation_1_h_tokens", 0)
return int(cache_5m) + int(cache_1h)
# 回退到旧格式
return int(usage.get("cache_creation_input_tokens", 0))
def build_sse_headers(extra_headers: Optional[Dict[str, str]] = None) -> Dict[str, str]:
"""
构建 SSEtext/event-stream推荐响应头用于减少代理缓冲带来的卡顿/成段输出。
说明:
- Cache-Control: no-transform 可避免部分代理对流做压缩/改写导致缓冲
- X-Accel-Buffering: no 可显式提示 Nginx 关闭缓冲(即使全局已关闭也无害)
"""
headers: Dict[str, str] = {
"Cache-Control": "no-cache, no-transform",
"X-Accel-Buffering": "no",
}
if extra_headers:
headers.update(extra_headers)
return headers