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src/api/handlers/claude/adapter.py
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228
src/api/handlers/claude/adapter.py
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"""
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Claude Chat Adapter - 基于 ChatAdapterBase 的 Claude Chat API 适配器
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处理 /v1/messages 端点的 Claude Chat 格式请求。
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"""
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from typing import Any, Dict, Optional, Type
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from fastapi import HTTPException, Request
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from fastapi.responses import JSONResponse
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from src.api.base.adapter import ApiAdapter, ApiMode
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from src.api.base.context import ApiRequestContext
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from src.api.handlers.base.chat_adapter_base import ChatAdapterBase, register_adapter
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from src.api.handlers.base.chat_handler_base import ChatHandlerBase
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from src.core.logger import logger
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from src.core.optimization_utils import TokenCounter
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from src.models.claude import ClaudeMessagesRequest, ClaudeTokenCountRequest
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class ClaudeCapabilityDetector:
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"""Claude API 能力检测器"""
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@staticmethod
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def detect_from_headers(
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headers: Dict[str, str],
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request_body: Optional[Dict[str, Any]] = None,
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) -> Dict[str, bool]:
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"""
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从 Claude 请求头检测能力需求
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检测规则:
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- anthropic-beta: context-1m-xxx -> context_1m: True
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Args:
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headers: 请求头字典
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request_body: 请求体（Claude 不使用，保留用于接口统一）
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"""
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requirements: Dict[str, bool] = {}
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# 检查 anthropic-beta 请求头（大小写不敏感）
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beta_header = None
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for key, value in headers.items():
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if key.lower() == "anthropic-beta":
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beta_header = value
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break
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if beta_header:
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# 检查是否包含 context-1m 标识
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if "context-1m" in beta_header.lower():
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requirements["context_1m"] = True
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return requirements
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@register_adapter
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class ClaudeChatAdapter(ChatAdapterBase):
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"""
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Claude Chat API 适配器
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处理 Claude Chat 格式的请求（/v1/messages 端点，进行格式验证）。
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"""
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FORMAT_ID = "CLAUDE"
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name = "claude.chat"
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@property
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def HANDLER_CLASS(self) -> Type[ChatHandlerBase]:
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"""延迟导入 Handler 类避免循环依赖"""
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from src.api.handlers.claude.handler import ClaudeChatHandler
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return ClaudeChatHandler
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def __init__(self, allowed_api_formats: Optional[list[str]] = None):
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super().__init__(allowed_api_formats or ["CLAUDE"])
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logger.info(f"[{self.name}] 初始化Chat模式适配器 | API格式: {self.allowed_api_formats}")
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def extract_api_key(self, request: Request) -> Optional[str]:
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"""从请求中提取 API 密钥 (x-api-key)"""
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return request.headers.get("x-api-key")
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def detect_capability_requirements(
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self,
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headers: Dict[str, str],
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request_body: Optional[Dict[str, Any]] = None,
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) -> Dict[str, bool]:
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"""检测 Claude 请求中隐含的能力需求"""
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return ClaudeCapabilityDetector.detect_from_headers(headers)
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# =========================================================================
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# Claude 特定的计费逻辑
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# =========================================================================
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def compute_total_input_context(
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self,
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input_tokens: int,
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cache_read_input_tokens: int,
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cache_creation_input_tokens: int = 0,
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) -> int:
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"""
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计算 Claude 的总输入上下文（用于阶梯计费判定）
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Claude 的总输入 = input_tokens + cache_creation_input_tokens + cache_read_input_tokens
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"""
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return input_tokens + cache_creation_input_tokens + cache_read_input_tokens
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def _validate_request_body(self, original_request_body: dict, path_params: dict = None):
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"""验证请求体"""
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try:
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if not isinstance(original_request_body, dict):
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raise ValueError("Request body must be a JSON object")
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required_fields = ["model", "messages", "max_tokens"]
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missing_fields = [f for f in required_fields if f not in original_request_body]
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if missing_fields:
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raise ValueError(f"Missing required fields: {', '.join(missing_fields)}")
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request = ClaudeMessagesRequest.model_validate(
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original_request_body,
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strict=False,
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)
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except ValueError as e:
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logger.error(f"请求体基本验证失败: {str(e)}")
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raise HTTPException(status_code=400, detail=str(e))
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except Exception as e:
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logger.warning(f"Pydantic验证警告(将继续处理): {str(e)}")
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request = ClaudeMessagesRequest.model_construct(
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model=original_request_body.get("model"),
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max_tokens=original_request_body.get("max_tokens"),
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messages=original_request_body.get("messages", []),
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stream=original_request_body.get("stream", False),
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)
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return request
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def _build_audit_metadata(self, _payload: Dict[str, Any], request_obj) -> Dict[str, Any]:
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"""构建 Claude Chat 特定的审计元数据"""
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role_counts: dict[str, int] = {}
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for message in request_obj.messages:
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role_counts[message.role] = role_counts.get(message.role, 0) + 1
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return {
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"action": "claude_messages",
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"model": request_obj.model,
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"stream": bool(request_obj.stream),
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"max_tokens": request_obj.max_tokens,
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"temperature": getattr(request_obj, "temperature", None),
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"top_p": getattr(request_obj, "top_p", None),
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"top_k": getattr(request_obj, "top_k", None),
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"messages_count": len(request_obj.messages),
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"message_roles": role_counts,
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"stop_sequences": len(request_obj.stop_sequences or []),
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"tools_count": len(request_obj.tools or []),
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"system_present": bool(request_obj.system),
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"metadata_present": bool(request_obj.metadata),
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"thinking_enabled": bool(request_obj.thinking),
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}
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def build_claude_adapter(x_app_header: Optional[str]):
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"""根据 x-app 头部构造 Chat 或 Claude Code 适配器。"""
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if x_app_header and x_app_header.lower() == "cli":
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from src.api.handlers.claude_cli.adapter import ClaudeCliAdapter
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return ClaudeCliAdapter()
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return ClaudeChatAdapter()
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class ClaudeTokenCountAdapter(ApiAdapter):
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"""计算 Claude 请求 Token 数的轻量适配器。"""
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name = "claude.token_count"
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mode = ApiMode.STANDARD
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def extract_api_key(self, request: Request) -> Optional[str]:
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"""从请求中提取 API 密钥 (x-api-key 或 Authorization: Bearer)"""
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# 优先检查 x-api-key
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api_key = request.headers.get("x-api-key")
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if api_key:
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return api_key
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# 降级到 Authorization: Bearer
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authorization = request.headers.get("authorization")
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if authorization and authorization.startswith("Bearer "):
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return authorization.replace("Bearer ", "")
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return None
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async def handle(self, context: ApiRequestContext):
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payload = context.ensure_json_body()
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try:
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request = ClaudeTokenCountRequest.model_validate(payload, strict=False)
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except Exception as e:
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logger.error(f"Token count payload invalid: {e}")
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raise HTTPException(status_code=400, detail="Invalid token count payload") from e
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token_counter = TokenCounter()
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total_tokens = 0
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if request.system:
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if isinstance(request.system, str):
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total_tokens += token_counter.count_tokens(request.system, request.model)
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elif isinstance(request.system, list):
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for block in request.system:
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if hasattr(block, "text"):
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total_tokens += token_counter.count_tokens(block.text, request.model)
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messages_dict = [
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msg.model_dump() if hasattr(msg, "model_dump") else msg for msg in request.messages
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]
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total_tokens += token_counter.count_messages_tokens(messages_dict, request.model)
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context.add_audit_metadata(
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action="claude_token_count",
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model=request.model,
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messages_count=len(request.messages),
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system_present=bool(request.system),
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tools_count=len(request.tools or []),
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thinking_enabled=bool(request.thinking),
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input_tokens=total_tokens,
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)
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return JSONResponse({"input_tokens": total_tokens})
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__all__ = [
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"ClaudeChatAdapter",
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"ClaudeTokenCountAdapter",
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"build_claude_adapter",
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]
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