"""工具调用内核 —— 让 LLM 以 OpenAI function-calling 协议操作工作区文件。 组成（对齐《实现方案_v4_模型池与工具智能体.md》D4）： - TOOLS_SPEC：list_dir / read_file / write_file / edit_file / search_files / run_command / web_fetch 七个工具的 OpenAI tools 声明 - WorkspaceTools：被"关押"在根目录内的文件工具（路径越界一律拒绝，Windows pathlib）； web_fetch 带公网 SSRF 防护（dsh web_fetch 同款），run_command 带危险命令拦截 - parse_tool_calls：解析 OpenAI 响应里的 tool_calls（arguments 容错为 {}） - ToolLoop：通用智能体循环。chat_fn 注入（网关传 OpenAI 兼容客户端，测试传假实现）， 本模块只负责循环编排：调用 -> 执行工具 -> 回喂结果 -> 直到模型给出最终答复。 工程约束： - 纯标准库（router_system 零第三方依赖不变） - 工具结果回喂前截断（防止上下文爆炸），轮数与 token 双上限（金额护栏） - 事件回调 on_event 逐条产出过程事件（供 SSE 透出"智能体在做什么"） - 工具在线程池执行（asyncio.to_thread），长命令/大搜索不阻塞事件循环 - 重复同参调用达到阈值回喂警语（防模型原地打转，dsh repeat-reminder 同款） """ from __future__ import annotations import asyncio import ipaddress import json from pathlib import Path from typing import Any, Awaitable, Callable, Dict, List, Optional # 回喂给模型的工具结果/读取内容上限（字符） MAX_READ_CHARS = 8000 MAX_LIST_ENTRIES = 200 MAX_RESULT_CHARS = 8000 MAX_WRITE_CHARS = 200_000 # search_files 上限 SEARCH_MAX_MATCHES = 30 SEARCH_MAX_FILES = 400 SEARCH_MAX_FILE_BYTES = 512 * 1024 SEARCH_SKIP_DIRS = {".git", "node_modules", "__pycache__", ".venv", "venv", "dist", "build"} # run_command 上限 SHELL_OUTPUT_CHARS = 4000 # web_fetch 上限（SSRF 防护：仅公网 http/https，拒绝私网/环回/链路本地地址） FETCH_MAX_CHARS = 12000 FETCH_TIMEOUT_S = 15.0 FETCH_MAX_BYTES = 512 * 1024 FETCH_ALLOWED_SCHEMES = ("http", "https") # NAT64 Well-Known Prefix（dsh 同款拒绝项） _NAT64_PREFIX = ipaddress.ip_network("64:ff9b::/96") # 重复调用提醒阈值（同一工具 + 同一参数第 N 次起提示模型换策略） REPEAT_CALL_WARN_AT = 3 # 默认循环上限 DEFAULT_MAX_ROUNDS = 8 # OpenAI tools 声明（chat/completions 请求的 tools 参数） TOOLS_SPEC: List[Dict[str, Any]] = [ { "type": "function", "function": { "name": "list_dir", "description": "列出工作区内目录的内容（文件与子目录，含大小）。", "parameters": { "type": "object", "properties": { "path": {"type": "string", "description": "工作区内的相对路径，默认根目录"} }, }, }, }, { "type": "function", "function": { "name": "read_file", "description": "读取工作区内一个文本文件的内容（过长自动截断）。", "parameters": { "type": "object", "properties": { "path": {"type": "string", "description": "工作区内的相对路径"} }, "required": ["path"], }, }, }, { "type": "function", "function": { "name": "write_file", "description": "把文本内容写入（或创建/覆盖）工作区内的一个文件。", "parameters": { "type": "object", "properties": { "path": {"type": "string", "description": "工作区内的相对路径"}, "content": {"type": "string", "description": "要写入的全文"}, }, "required": ["path", "content"], }, }, }, { "type": "function", "function": { "name": "edit_file", "description": "对工作区内已有文件做精确替换编辑：old_string 必须在文件中恰好出现一次，" "被替换为 new_string。适合小改动；大改用 write_file 整体重写。", "parameters": { "type": "object", "properties": { "path": {"type": "string", "description": "工作区内的相对路径"}, "old_string": {"type": "string", "description": "要替换的原文（须唯一匹配）"}, "new_string": {"type": "string", "description": "替换后的新文"}, }, "required": ["path", "old_string", "new_string"], }, }, }, { "type": "function", "function": { "name": "search_files", "description": "在工作区（或其子目录）内按关键词跨文件搜索文本内容，" "返回匹配的文件/行号/行内容（自动跳过 .git、node_modules 等目录与二进制大文件）。", "parameters": { "type": "object", "properties": { "query": {"type": "string", "description": "搜索的关键词（大小写敏感）"}, "path": {"type": "string", "description": "限定的子目录，默认整个工作区"}, }, "required": ["query"], }, }, }, { "type": "function", "function": { "name": "run_command", "description": "在工作区根目录执行一条 shell 命令并返回退出码与输出（如运行测试、查看版本）。" "仅当系统开启 allow_shell 时可用。", "parameters": { "type": "object", "properties": { "command": {"type": "string", "description": "要执行的命令行"}, }, "required": ["command"], }, }, }, { "type": "function", "function": { "name": "web_fetch", "description": "抓取一个公网 http/https URL 的文本内容（如查文档/接口说明），" "返回截断后的正文。私网/环回地址会被拒绝；仅当系统开启 allow_net 时可用。", "parameters": { "type": "object", "properties": { "url": {"type": "string", "description": "要抓取的完整 URL（http/https）"}, }, "required": ["url"], }, }, }, ] TOOL_NAMES = {t["function"]["name"] for t in TOOLS_SPEC} def browse_directories(path: str = "") -> Dict[str, Any]: """目录选择器的本地文件系统浏览（只列目录，不读文件内容）。 path 为空时列出 Windows 盘符（POSIX 列根目录）。返回 {"ok", "path", "parent", "dirs": [名称]}；用于智能体"选择工作区"。 """ import os if not path or not path.strip(): if os.name == "nt": drives = [f"{c}:\\" for c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" if os.path.exists(f"{c}:\\")] return {"ok": True, "path": "", "parent": "", "dirs": drives} return {"ok": True, "path": "/", "parent": "", "dirs": sorted(os.listdir("/"))} p = Path(path).resolve() if not p.exists(): return {"ok": False, "error": f"路径不存在: {path}"} if not p.is_dir(): return {"ok": False, "error": f"不是目录: {path}"} dirs = [] for child in sorted(p.iterdir(), key=lambda c: c.name.lower()): try: if child.is_dir(): dirs.append(child.name) except OSError: continue # 无权限/符号链接坏点，跳过 parent = str(p.parent) if p.parent != p else "" return {"ok": True, "path": str(p), "parent": parent, "dirs": dirs} class ToolError(Exception): """工具执行失败（路径越界/不存在/参数非法）。""" def _atomic_write_text(p: Path, text: str) -> None: """原子写文本：同目录临时文件 + os.replace（防半截文件；dsh atomic-write 同款）。 Windows 上目标被占用时 os.replace 可能 EPERM：小退避重试一次， 仍失败则退回直接写（保可用性，牺牲原子性）。 """ import os import tempfile import time tmp = None try: with tempfile.NamedTemporaryFile( "w", encoding="utf-8", dir=str(p.parent), prefix=p.name + ".", suffix=".tmp", delete=False) as f: tmp = Path(f.name) f.write(text) for attempt in (0, 1): try: os.replace(tmp, p) return except PermissionError: if attempt == 0: time.sleep(0.05) raise except PermissionError: if tmp is not None: tmp.unlink(missing_ok=True) p.write_text(text, encoding="utf-8") # 退路：非原子但保可用 except BaseException: if tmp is not None: tmp.unlink(missing_ok=True) raise # 危险命令模式（大小写不敏感）：宁可误拦不可漏拦（用户可换写法绕开误拦项） _DANGEROUS_PATTERNS = [ (r"\bformat\b\s+[a-z]:", "格式化磁盘"), (r"\brd\s+/s", "递归删除目录"), (r"\brmdir\s+/s", "递归删除目录"), (r"\bdel\s+/[fsmq]", "强制/递归删除"), (r"\brm\s+(-[a-z]*r[a-z]*f|-[a-z]*f[a-z]*r)\s+[/~]", "递归强制删除根/家目录"), (r"\bshutdown\b", "关机/重启"), (r"\bdiskpart\b", "磁盘分区操作"), (r"\bbcdedit\b", "启动配置修改"), (r"\breg\s+delete\b", "注册表删除"), (r"\bvssadmin\s+delete\b", "卷影副本删除"), (r"\bmkfs\b", "格式化文件系统"), (r"\bdd\s+if=", "裸磁盘写入"), (r":\(\)\s*\{.*\};\s*:", "fork 炸弹"), (r"\bcurl\b[^|]*\|\s*(ba)?sh\b", "下载并执行脚本"), (r"\bwget\b[^|]*\|\s*(ba)?sh\b", "下载并执行脚本"), (r"\biwr\b[^|]*\|\s*iex\b", "下载并执行脚本"), ] def _dangerous_command_reason(command: str) -> str: """命中危险命令模式时返回原因，否则返回空串（审批之外的独立防线）。""" import re lowered = command.lower() for pattern, reason in _DANGEROUS_PATTERNS: if re.search(pattern, lowered): return reason return "" class WorkspaceTools: """被限制在根目录内的文件工具（智能体的"手"）。 安全：所有路径先 join 再 resolve，解析结果必须仍位于根目录内 （根目录自身允许），否则抛 ToolError——防 ../ 越界与绝对路径逃逸。 """ def __init__(self, root: str | Path, allow_shell: bool = False, shell_timeout_s: int = 20, allow_net: bool = True): self.root = Path(root).resolve() self.root.mkdir(parents=True, exist_ok=True) self.allow_shell = bool(allow_shell) self.shell_timeout_s = max(1, int(shell_timeout_s)) self.allow_net = bool(allow_net) # ---------- 路径关押 ---------- def resolve(self, rel_path: str) -> Path: rel = (rel_path or "").strip().replace("\\", "/").lstrip("/") p = (self.root / rel).resolve() if p != self.root and self.root not in p.parents: raise ToolError(f"路径越界（不允许访问工作区之外）: {rel_path}") return p # ---------- 三个工具 ---------- def list_dir(self, rel_path: str = "") -> Dict[str, Any]: d = self.resolve(rel_path) if not d.exists(): return {"ok": False, "error": f"目录不存在: {rel_path}"} if not d.is_dir(): return {"ok": False, "error": f"不是目录: {rel_path}"} entries = [] for child in sorted(d.iterdir(), key=lambda c: (c.is_file(), c.name.lower())): if child.is_dir(): entries.append({"name": child.name + "/", "type": "dir"}) else: entries.append({ "name": child.name, "type": "file", "size": child.stat().st_size, }) if len(entries) >= MAX_LIST_ENTRIES: entries.append({"name": f"…（超过 {MAX_LIST_ENTRIES} 项已截断）", "type": "notice"}) break return {"ok": True, "path": rel_path or ".", "entries": entries} def read_file(self, rel_path: str) -> Dict[str, Any]: p = self.resolve(rel_path) if not p.exists(): return {"ok": False, "error": f"文件不存在: {rel_path}"} if not p.is_file(): return {"ok": False, "error": f"不是文件: {rel_path}"} try: text = p.read_text(encoding="utf-8") except UnicodeDecodeError: return {"ok": False, "error": f"非文本文件（UTF-8 解码失败）: {rel_path}"} truncated = len(text) > MAX_READ_CHARS return { "ok": True, "path": rel_path, "content": text[:MAX_READ_CHARS], "truncated": truncated, "total_chars": len(text), } def write_file(self, rel_path: str, content: str) -> Dict[str, Any]: if len(content) > MAX_WRITE_CHARS: return {"ok": False, "error": f"内容过长（>{MAX_WRITE_CHARS} 字符），拒绝写入"} p = self.resolve(rel_path) p.parent.mkdir(parents=True, exist_ok=True) _atomic_write_text(p, content) return {"ok": True, "path": rel_path, "bytes_written": len(content.encode("utf-8"))} def edit_file(self, rel_path: str, old_string: str, new_string: str) -> Dict[str, Any]: """精确替换编辑：old_string 必须在文件中恰好出现一次（harness 式安全编辑）。""" if not old_string: return {"ok": False, "error": "old_string 不能为空"} if len(old_string) > MAX_READ_CHARS: return {"ok": False, "error": "old_string 过长（先 read_file 分段定位）"} p = self.resolve(rel_path) if not p.exists() or not p.is_file(): return {"ok": False, "error": f"文件不存在: {rel_path}"} try: text = p.read_text(encoding="utf-8") except UnicodeDecodeError: return {"ok": False, "error": f"非文本文件: {rel_path}"} count = text.count(old_string) if count == 0: return {"ok": False, "error": "old_string 未在文件中找到（先 read_file 核对原文）"} if count > 1: return {"ok": False, "error": f"old_string 出现 {count} 次（要求唯一）；请扩大上下文使其唯一"} new_text = text.replace(old_string, new_string, 1) _atomic_write_text(p, new_text) return { "ok": True, "path": rel_path, "replaced": 1, "changed_chars": len(new_text) - len(text), } def search_files(self, query: str, rel_path: str = "") -> Dict[str, Any]: """跨文件文本搜索（os.walk 修剪依赖/构建目录，限量返回，不跟随符号链接）。""" import os if not query: return {"ok": False, "error": "query 不能为空"} base = self.resolve(rel_path or "") if not base.exists() or not base.is_dir(): return {"ok": False, "error": f"目录不存在: {rel_path}"} matches: List[Dict[str, Any]] = [] scanned = 0 truncated = False def _match_file(p: Path) -> bool: """在单文件内找匹配（找到即 True）。""" nonlocal matches, truncated for lineno, line in enumerate(p.read_text(encoding="utf-8").splitlines(), 1): if query in line: rel = p.relative_to(self.root).as_posix() matches.append({ "file": rel, "line": lineno, "text": line.strip()[:300], }) if len(matches) >= SEARCH_MAX_MATCHES: truncated = True return True return False for dirpath, dirnames, filenames in os.walk(base, followlinks=False): # 修剪依赖/构建目录：不进入（rglob 全量物化在大工作区上不可接受） dirnames[:] = sorted((d for d in dirnames if d not in SEARCH_SKIP_DIRS), key=str.lower) if len(matches) >= SEARCH_MAX_MATCHES or scanned > SEARCH_MAX_FILES: truncated = True break for fname in sorted(filenames, key=str.lower): fpath = Path(dirpath) / fname try: if not fpath.is_file(): continue if fpath.stat().st_size > SEARCH_MAX_FILE_BYTES: continue scanned += 1 if scanned > SEARCH_MAX_FILES: truncated = True break if _match_file(fpath): break except (OSError, UnicodeDecodeError): continue # 二进制/不可读/并发删除，跳过 if len(matches) >= SEARCH_MAX_MATCHES: truncated = True break return {"ok": True, "query": query, "matches": matches, "scanned_files": scanned, "truncated": truncated} def run_command(self, command: str) -> Dict[str, Any]: """在工作区根目录执行一条 shell 命令行（默认关闭，allow_shell 开启后可用）。 安全设计（dsh bash 工具同款语义）： - 危险命令模式先拦截（即使审批通过也拒绝） - 用显式 shell 解释器的参数列表执行（cmd /c 或 /bin/sh -c）， 命令字符串对解释器可见属于功能本体，防护依赖 allow_shell 开关 + 审批门卫 + 超时熔断 + cwd 关押在本工作区 """ import os import subprocess if not self.allow_shell: return {"ok": False, "error": "run_command 未启用（系统设置 allow_shell 为关）。" "请让用户在智能体页打开「允许执行命令」后重试。"} command = (command or "").strip() if not command: return {"ok": False, "error": "command 不能为空"} blocked = _dangerous_command_reason(command) if blocked: return {"ok": False, "error": f"命令被安全策略拒绝（{blocked}）。请换一种不具破坏性的做法。"} if os.name == "nt": argv = [os.environ.get("COMSPEC", "cmd.exe"), "/c", command] else: argv = ["/bin/sh", "-c", command] creationflags = 0x08000000 if os.name == "nt" else 0 # CREATE_NO_WINDOW try: proc = subprocess.run( argv, cwd=str(self.root), capture_output=True, timeout=self.shell_timeout_s, creationflags=creationflags, ) out = (proc.stdout or b"").decode("utf-8", errors="replace") err = (proc.stderr or b"").decode("utf-8", errors="replace") combined = (out + ("\n[stderr]\n" + err if err.strip() else "")).strip() if len(combined) > SHELL_OUTPUT_CHARS: combined = combined[:SHELL_OUTPUT_CHARS] + "…(输出截断)" return {"ok": True, "exit_code": proc.returncode, "output": combined or "(无输出)", "command": command} except subprocess.TimeoutExpired: return {"ok": False, "error": f"命令超时（>{self.shell_timeout_s}s），已终止: {command}"} except OSError as e: return {"ok": False, "error": f"命令执行失败: {type(e).__name__}: {e}"} def web_fetch(self, url: str) -> Dict[str, Any]: """抓取公网 URL 文本（SSRF 防护：拒绝非 http(s)、私网/环回/链路本地/NAT64 目标）。 校验流程对齐 dsh web_fetch：解析 DNS -> 全部地址必须公网 -> 才发起请求； 响应限量（字节/字符）、超时熔断、二进制嗅探拒绝。 """ import socket import urllib.error import urllib.parse import urllib.request if not self.allow_net: return {"ok": False, "error": "web_fetch 未启用（系统设置 allow_net 为关）。"} raw = (url or "").strip() try: parsed = urllib.parse.urlsplit(raw) except ValueError: return {"ok": False, "error": f"URL 无法解析: {raw[:120]}"} if parsed.scheme.lower() not in FETCH_ALLOWED_SCHEMES: return {"ok": False, "error": f"仅允许 http/https URL（收到 {parsed.scheme or '空'}）"} host = parsed.hostname or "" if not host: return {"ok": False, "error": "URL 缺少主机名"} try: port = parsed.port except ValueError: return {"ok": False, "error": "URL 端口非法"} # DNS 解析后逐一校验：任何私网/环回/链路本地/保留/NAT64 地址都拒绝 try: infos = socket.getaddrinfo(host, port or (443 if parsed.scheme == "https" else 80), proto=socket.IPPROTO_TCP) except socket.gaierror as e: return {"ok": False, "error": f"域名解析失败: {host} ({e})"} for info in infos: ip = info[4][0] try: addr = ipaddress.ip_address(ip.split("%")[0]) # 剥 zone id except ValueError: return {"ok": False, "error": f"解析出非法地址: {ip}"} if (addr.is_private or addr.is_loopback or addr.is_link_local or addr.is_reserved or addr.is_multicast or addr.is_unspecified or (addr.version == 6 and addr in _NAT64_PREFIX)): return {"ok": False, "error": f"目标地址 {addr} 属于内网/保留段，已被 SSRF 防护拒绝"} try: req = urllib.request.Request(raw, headers={"User-Agent": "router-agent/1.0"}) with urllib.request.urlopen(req, timeout=FETCH_TIMEOUT_S) as resp: body = resp.read(FETCH_MAX_BYTES + 1) charset = resp.headers.get_content_charset() or "utf-8" except urllib.error.HTTPError as e: return {"ok": False, "error": f"HTTP {e.code}: {e.reason}"} except (urllib.error.URLError, OSError, ValueError) as e: return {"ok": False, "error": f"抓取失败: {type(e).__name__}: {e}"} if len(body) > FETCH_MAX_BYTES: return {"ok": False, "error": f"响应超过 {FETCH_MAX_BYTES // 1024}KB 上限，拒绝处理"} if b"\x00" in body[:512]: return {"ok": False, "error": "非文本内容（检测到二进制），拒绝处理"} try: text = body.decode(charset, errors="replace") except LookupError: text = body.decode("utf-8", errors="replace") truncated = len(text) > FETCH_MAX_CHARS return {"ok": True, "url": raw, "content": text[:FETCH_MAX_CHARS], "truncated": truncated, "total_chars": len(text)} # ---------- 统一执行入口 ---------- def execute(self, name: str, arguments: Dict[str, Any]) -> Dict[str, Any]: """按名字执行工具；任何异常折叠为 {"ok": False, "error": ...}。""" try: if name == "list_dir": return self.list_dir(str(arguments.get("path", ""))) if name == "read_file": return self.read_file(str(arguments.get("path", ""))) if name == "write_file": return self.write_file( str(arguments.get("path", "")), str(arguments.get("content", ""))) if name == "edit_file": return self.edit_file( str(arguments.get("path", "")), str(arguments.get("old_string", "")), str(arguments.get("new_string", ""))) if name == "search_files": return self.search_files( str(arguments.get("query", "")), str(arguments.get("path", ""))) if name == "run_command": return self.run_command(str(arguments.get("command", ""))) if name == "web_fetch": return self.web_fetch(str(arguments.get("url", ""))) return {"ok": False, "error": f"未知工具: {name}"} except ToolError as e: return {"ok": False, "error": str(e)} except OSError as e: return {"ok": False, "error": f"文件系统错误: {type(e).__name__}: {e}"} def _loads_json_object(text: str) -> Dict[str, Any]: """宽松解析 JSON 对象：剥除 markdown 围栏、取首个 {...}；失败返回 {}。""" t = (text or "").strip() fence = "`" * 3 t = t.replace(fence + "json", fence).replace(fence, "").strip() try: obj = json.loads(t) if isinstance(obj, dict): return obj except json.JSONDecodeError: pass start, end = t.find("{"), t.rfind("}") if start != -1 and end > start: try: obj = json.loads(t[start:end + 1]) if isinstance(obj, dict): return obj except json.JSONDecodeError: pass return {} def parse_tool_calls(message: Dict[str, Any]) -> List[Dict[str, Any]]: """从 OpenAI 响应的 message 解析 tool_calls。 返回 [{"id","name","arguments"(dict)}]；arguments 非法 JSON 时容错为 {}。 """ out: List[Dict[str, Any]] = [] for tc in message.get("tool_calls") or []: fn = tc.get("function") or {} raw = fn.get("arguments") if isinstance(raw, dict): args = raw elif isinstance(raw, str) and raw.strip(): try: parsed = json.loads(raw) args = parsed if isinstance(parsed, dict) else {} except json.JSONDecodeError: args = {} else: args = {} out.append({ "id": tc.get("id") or f"call_{len(out)}", "name": fn.get("name") or "", "arguments": args, }) return out class ToolLoop: """通用智能体工具循环（zcode 式：思考 -> 调工具 -> 看结果 -> 再思考）。 chat_fn(messages, tools_spec) -> {"content": str|None, "tool_calls": [ {id,name,arguments}, ... ], "usage": {"prompt_tokens", "completion_tokens"}} 由网关注入真实 OpenAI 兼容客户端；测试注入脚本化假实现。 on_event(ev) 为可选同步回调，逐条收到过程事件： {"type":"round","round":n} {"type":"tool_call","round":n,"name":...,"arguments":...} {"type":"tool_result","round":n,"name":...,"ok":...,"preview":...} {"type":"usage","prompt_tokens":...,"completion_tokens":...} {"type":"final","round":n,"reason":"answer"|"max_rounds"|"token_cap"|"error"} """ def __init__( self, tools: WorkspaceTools, chat_fn: Callable[[List[Dict[str, Any]], List[Dict[str, Any]]], Awaitable[Dict[str, Any]]], max_rounds: int = DEFAULT_MAX_ROUNDS, token_cap: int = 0, on_event: Optional[Callable[[Dict[str, Any]], None]] = None, result_preview_chars: int = MAX_RESULT_CHARS, emit_final: bool = True, approval_hook: Optional[Callable[[str, Dict[str, Any]], Awaitable[bool]]] = None, on_delta: Optional[Callable[[str], None]] = None, ): self.tools = tools self.chat_fn = chat_fn self.max_rounds = max(1, int(max_rounds)) self.token_cap = int(token_cap) # 0 = 不限 self.on_event = on_event self.result_preview_chars = result_preview_chars self.emit_final = emit_final # 两级模式内层循环置 False，由外层统一收尾 # 审批门卫（D9）：执行工具前调用，返回 False = 用户拒绝（可选；缺省跳过审批） self.approval_hook = approval_hook # 流式增量回调（D10，可选）：chat_fn 支持 on_delta 参数时逐段转发模型文本 self.on_delta = on_delta self._accepts_delta: Optional[bool] = None # 重复调用计数（dsh repeat-tool-reminder 同款提醒，防模型原地打转） self._call_counts: Dict[tuple, int] = {} def _emit(self, ev: Dict[str, Any]) -> None: if ev.get("type") == "final" and not self.emit_final: return # 内层循环不发终态事件（外层编排负责） if self.on_event is not None: try: self.on_event(ev) except Exception: pass # 事件回调不允许打断主循环 def _total_tokens(self, usage: Dict[str, int]) -> int: return int(usage.get("prompt_tokens", 0)) + int(usage.get("completion_tokens", 0)) def _invoke_chat(self, messages: List[Dict[str, Any]]) -> Awaitable[Dict[str, Any]]: """调用 chat_fn；其签名支持 on_delta 时才传入（对旧假实现向后兼容）。""" if self._accepts_delta is None: try: import inspect self._accepts_delta = len(inspect.signature(self.chat_fn).parameters) >= 3 except (TypeError, ValueError): self._accepts_delta = False if self.on_delta is not None and self._accepts_delta: return self.chat_fn(messages, TOOLS_SPEC, self.on_delta) return self.chat_fn(messages, TOOLS_SPEC) async def run(self, task: str, system: str = "", history: Optional[List[Dict[str, Any]]] = None) -> Dict[str, Any]: """执行任务直到模型给出最终答复或触顶。 history 为既往对话消息（user/assistant，不含工具细节），用于会话式多轮上下文。 """ messages: List[Dict[str, Any]] = [] if system: messages.append({"role": "system", "content": system}) if history: messages.extend(history) messages.append({"role": "user", "content": task}) total_in = 0 total_out = 0 last_content = "" for round_no in range(1, self.max_rounds + 1): self._emit({"type": "round", "round": round_no}) try: resp = await self._invoke_chat(messages) except Exception as e: self._emit({"type": "final", "round": round_no, "reason": "error", "error": f"{type(e).__name__}: {e}"}) return {"response": "", "rounds": round_no, "reason": "error", "error": f"{type(e).__name__}: {e}", "prompt_tokens": total_in, "completion_tokens": total_out} usage = resp.get("usage") or {} total_in += int(usage.get("prompt_tokens", 0)) total_out += int(usage.get("completion_tokens", 0)) self._emit({"type": "usage", "prompt_tokens": total_in, "completion_tokens": total_out}) # 金额护栏（D6 同源）：token 触顶立即停 if self.token_cap and total_in + total_out > self.token_cap: self._emit({"type": "final", "round": round_no, "reason": "token_cap"}) return {"response": last_content, "rounds": round_no, "reason": "token_cap", "error": f"token 熔断（{total_in + total_out}/{self.token_cap}）", "prompt_tokens": total_in, "completion_tokens": total_out} calls = resp.get("tool_calls") or [] if not calls: self._emit({"type": "final", "round": round_no, "reason": "answer"}) return {"response": resp.get("content") or "", "rounds": round_no, "reason": "answer", "error": None, "prompt_tokens": total_in, "completion_tokens": total_out} # 有工具调用：回填 assistant 消息（带原始 tool_calls 结构）+ 逐个执行 messages.append({ "role": "assistant", "content": resp.get("content") or None, "tool_calls": [ { "id": c["id"], "type": "function", "function": {"name": c["name"], "arguments": json.dumps(c["arguments"], ensure_ascii=False)}, } for c in calls ], }) for c in calls: self._emit({"type": "tool_call", "round": round_no, "name": c["name"], "arguments": c["arguments"]}) # 审批门卫（D9）：按策略挂起等待用户裁决；拒绝/超时折叠为失败结果回喂 if self.approval_hook is not None: allowed = False try: allowed = await self.approval_hook(c["name"], c["arguments"]) except Exception as e: self._emit({"type": "approval_decided", "round": round_no, "id": "", "allowed": False, "note": f"审批流程异常: {type(e).__name__}"}) if not allowed: denied = {"ok": False, "error": "用户拒绝执行该操作（如需执行请调整审批策略或换一种做法）"} preview = json.dumps(denied, ensure_ascii=False) self._emit({"type": "tool_result", "round": round_no, "name": c["name"], "ok": False, "preview": preview}) messages.append({"role": "tool", "tool_call_id": c["id"], "content": preview}) continue result = await asyncio.to_thread(self.tools.execute, c["name"], c["arguments"]) preview = json.dumps(result, ensure_ascii=False) if len(preview) > self.result_preview_chars: preview = preview[:self.result_preview_chars] + "…(截断)" # 重复调用提醒：同一工具同一参数第 N 次起，回喂时附警语促使换策略 key = (c["name"], json.dumps(c["arguments"], sort_keys=True, ensure_ascii=False)) seen = self._call_counts.get(key, 0) + 1 self._call_counts[key] = seen if seen >= REPEAT_CALL_WARN_AT: preview += (f"\n[系统提示] 该工具已第 {seen} 次以完全相同的参数调用。" "重复同样的调用不会带来新信息；请改变做法或直接给出最终答复。") self._emit({"type": "repeat_warning", "round": round_no, "name": c["name"], "count": seen}) self._emit({"type": "tool_result", "round": round_no, "name": c["name"], "ok": bool(result.get("ok")), "preview": preview}) messages.append({ "role": "tool", "tool_call_id": c["id"], "content": preview, }) last_content = resp.get("content") or last_content # 轮次耗尽：不再给工具，让模型立即总结（无 tools 的最后一次调用） self._emit({"type": "final", "round": self.max_rounds, "reason": "max_rounds"}) try: messages.append({"role": "user", "content": "工具轮次已达上限。请基于以上信息立即给出最终答复，不要再调用工具。"}) resp = await self.chat_fn(messages, []) usage = resp.get("usage") or {} total_in += int(usage.get("prompt_tokens", 0)) total_out += int(usage.get("completion_tokens", 0)) final_text = resp.get("content") or last_content except Exception: final_text = last_content return {"response": final_text, "rounds": self.max_rounds, "reason": "max_rounds", "error": "工具轮次达上限，已强制总结", "prompt_tokens": total_in, "completion_tokens": total_out}