290 lines
12 KiB
Python
290 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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"""
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任务执行引擎 V1：
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- DAG 依赖校验 + 下游自动触发（串行/并行）
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- RAG 知识库上下文注入
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- 预算告警（项目预算使用率阈值）
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- 事件通知（待审核/完成/失败）与告警记录
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"""
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import json
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import threading
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import traceback
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import db
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import llm_gateway
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import config
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import rag
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import notify
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def _log(task_id, level, message):
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try:
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db.w('INSERT INTO task_logs (task_id, level, message, created_at) VALUES (?,?,?,?)',
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(task_id, level, message, db.now()))
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except Exception:
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pass
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def _set_task(task_id, **fields):
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if not fields:
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return
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fields['updated_at'] = db.now()
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sets = ', '.join(f'{k}=?' for k in fields)
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db.w(f'UPDATE tasks SET {sets} WHERE id=?', (*fields.values(), task_id))
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def _cost_record(task, worker, usage):
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db.w(
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'INSERT INTO cost_records (task_id, project_id, worker_id, provider, model, '
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'prompt_tokens, completion_tokens, total_tokens, cost, created_at) '
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'VALUES (?,?,?,?,?,?,?,?,?,?)',
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(task['id'], task['project_id'], worker['id'], worker['provider'],
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worker['model'], usage['prompt_tokens'], usage['completion_tokens'],
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usage['total_tokens'], usage['cost'], db.now()))
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def _deps(task):
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try:
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return json.loads(task.get('depends_on') or '[]')
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except Exception:
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return []
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def check_dependencies(task):
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"""DAG 依赖检查：返回 (ok, blockers)"""
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blockers = []
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for dep_id in _deps(task):
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dep = db.q('SELECT id, title, status FROM tasks WHERE id=?', (dep_id,), one=True)
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if not dep:
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blockers.append(f'# {dep_id}（已删除）')
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elif dep['status'] != 'done':
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blockers.append(f'「{dep["title"]}」(#{dep_id}) {dep["status"]}')
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return (not blockers), blockers
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def pick_worker_auto(task):
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"""自动路由：按模型输入单价升序挑选 enabled Worker"""
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rows = db.q('SELECT * FROM workers WHERE status="enabled" ORDER BY id')
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if not rows:
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return None
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best, best_price = None, None
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for r in rows:
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pin, pout = llm_gateway.model_price(r['model'])
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price = pin + pout * 0.5
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if best_price is None or price < best_price:
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best, best_price = r, price
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return best
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def check_worker_limits(worker):
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"""成本上限预检：返回 (ok, reason)"""
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if worker['task_cost_limit'] and worker['task_cost_limit'] > 0:
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used = db.task_worker_cost(worker['id'])
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if used >= worker['task_cost_limit']:
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return False, f'该 Worker 累计成本 {used:.4f} 元已达单任务上限 {worker["task_cost_limit"]} 元'
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if worker['monthly_cost_limit'] and worker['monthly_cost_limit'] > 0:
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used = db.monthly_worker_cost(worker['id'])
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if used >= worker['monthly_cost_limit']:
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return False, f'该 Worker 本月成本 {used:.4f} 元已达月度上限 {worker["monthly_cost_limit"]} 元'
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return True, ''
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def _project_cost(project_id):
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rows = db.q('SELECT COALESCE(SUM(cost),0) AS t FROM cost_records WHERE project_id=?',
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(project_id,))
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return rows[0]['t'] if rows else 0.0
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def _check_project_budget(task):
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proj = db.q('SELECT * FROM projects WHERE id=?', (task['project_id'],), one=True)
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if proj and proj['budget_limit'] and proj['budget_limit'] > 0:
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used = _project_cost(task['project_id'])
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if used >= proj['budget_limit']:
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return False, f'项目预算已用完（{used:.2f}/{proj["budget_limit"]:.2f} 元）'
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return True, ''
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def _budget_alert(project_id):
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"""预算使用率告警（每次任务完成后检查，避免重复刷屏）"""
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proj = db.q('SELECT * FROM projects WHERE id=?', (project_id,), one=True)
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if not proj or not proj['budget_limit'] or proj['budget_limit'] <= 0:
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return
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used = _project_cost(project_id)
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ratio = used / proj['budget_limit']
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if ratio >= config.BUDGET_ALERT_RATIO:
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# 同项目 1 小时内只告警一次，避免刷屏
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dup = db.q('SELECT COUNT(*) c FROM alerts WHERE type="budget" AND detail LIKE ? '
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'AND created_at > ?', (f'项目「{proj["name"]}」%', db.now() - 3600))
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if dup[0]['c'] == 0:
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notify.notify('budget_alert',
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f'预算告警：项目「{proj["name"]}」已使用 {ratio*100:.0f}%',
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f'已花费 ¥{used:.2f} / 预算 ¥{proj["budget_limit"]:.2f}，'
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f'超过阈值 {config.BUDGET_ALERT_RATIO*100:.0f}%，请关注成本控制。',
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save_alert=True, level='warn', atype='budget')
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def _build_messages(task, worker):
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"""构造提示词：任务指令 + RAG 知识库上下文"""
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messages = []
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if worker['system_prompt']:
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messages.append({'role': 'system', 'content': worker['system_prompt']})
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user_text = task['description'] or task['title']
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ctx, refs = rag.build_context(task['project_id'], user_text)
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if ctx:
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user_text = f'{ctx}\n\n----\n\n任务指令：{user_text}'
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_log(task['id'], 'info', f'📚 RAG 知识库命中 {len(refs)} 个片段：' + '；'.join(refs[:5]))
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messages.append({'role': 'user', 'content': user_text})
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return messages
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def _trigger_downstream(task):
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"""DAG：任务完成后自动触发所有就绪的下游任务"""
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rows = db.q('SELECT * FROM tasks WHERE status IN ("todo","failed")')
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triggered = []
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for t in rows:
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deps = _deps(t)
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if task['id'] not in deps:
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continue
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ok, blockers = check_dependencies(t)
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if ok:
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if runner.submit(t['id']):
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triggered.append(t)
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else:
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_log(t['id'], 'info', f'⏳ 等待前置任务完成：' + '、'.join(blockers))
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return triggered
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def run_task(task_id):
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"""在后台线程中执行任务"""
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task = db.q('SELECT * FROM tasks WHERE id=?', (task_id,), one=True)
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if not task:
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return
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if task['status'] == 'running':
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return
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# DAG 依赖检查
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ok, blockers = check_dependencies(task)
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if not ok:
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_set_task(task_id, status='failed', error='前置任务未完成：' + '、'.join(blockers),
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finished_at=db.now())
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_log(task_id, 'error', '❌ 依赖未满足，无法执行：' + '、'.join(blockers))
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notify.notify('task_failed', f'任务失败：{task["title"]}',
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f'项目 #{task["project_id"]} 任务「{task["title"]}」因依赖未完成被拒绝执行：'
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+ '、'.join(blockers), save_alert=True, level='warn', atype='task_failed')
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return
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# 确定 Worker
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worker = None
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if task['worker_id']:
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worker = db.q('SELECT * FROM workers WHERE id=?', (task['worker_id'],), one=True)
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if not worker or worker['status'] != 'enabled':
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_set_task(task_id, status='failed', error='指定 Worker 不存在或已停用',
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finished_at=db.now())
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_log(task_id, 'error', '指定 Worker 不存在或已停用')
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notify.notify('worker_alert', f'Worker 异常：任务「{task["title"]}」',
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f'指定 Worker #{task["worker_id"]} 不存在或已停用', save_alert=True,
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level='warn', atype='worker_alert')
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return
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else:
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worker = pick_worker_auto(task)
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if not worker:
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_set_task(task_id, status='failed', error='无可用 Worker（自动路由失败）',
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finished_at=db.now())
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_log(task_id, 'error', '自动路由失败：无可用 Worker')
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notify.notify('worker_alert', f'Worker 异常：任务「{task["title"]}」',
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'自动路由失败：没有可用的 Worker', save_alert=True,
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level='warn', atype='worker_alert')
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return
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_set_task(task_id, worker_id=worker['id'])
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_log(task_id, 'info', f'自动路由 → Worker「{worker["name"]}」（{worker["provider"]}/{worker["model"]}）')
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# 预算/成本预检
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ok, reason = check_worker_limits(worker)
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if not ok:
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_set_task(task_id, status='failed', error=reason, finished_at=db.now())
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_log(task_id, 'error', reason)
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notify.notify('budget_alert', f'成本上限拦截：任务「{task["title"]}」', reason,
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save_alert=True, level='warn', atype='budget')
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return
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ok, reason = _check_project_budget(task)
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if not ok:
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_set_task(task_id, status='failed', error=reason, finished_at=db.now())
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_log(task_id, 'error', reason)
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notify.notify('budget_alert', f'预算拦截：任务「{task["title"]}」', reason,
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save_alert=True, level='warn', atype='budget')
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return
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_set_task(task_id, status='running', started_at=db.now(), error='')
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_log(task_id, 'info', f'开始执行：Worker「{worker["name"]}」 模型 {worker["provider"]}/{worker["model"]}')
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try:
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usage = llm_gateway.chat(
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worker['provider'], worker['model'], _build_messages(task, worker),
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temperature=worker['temperature'], max_tokens=worker['max_tokens'],
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base_url=worker['base_url'] or None, api_key=worker['api_key'] or None)
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except Exception as e:
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_set_task(task_id, status='failed', error=str(e), finished_at=db.now())
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_log(task_id, 'error', f'执行失败: {e}')
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notify.notify('task_failed', f'任务失败：{task["title"]}',
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f'项目 #{task["project_id"]} 任务「{task["title"]}」执行出错：{str(e)[:300]}',
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save_alert=True, level='warn', atype='task_failed')
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return
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_cost_record(task, worker, usage)
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_log(task_id, 'success',
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f'执行完成：{usage["total_tokens"]} tokens（输入 {usage["prompt_tokens"]} / 输出 {usage["completion_tokens"]}），'
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f'成本 ¥{usage["cost"]:.6f}')
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new_status = 'review' if task['review_required'] else 'done'
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fields = {
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'status': new_status,
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'output_text': usage['text'],
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'output_version': task['output_version'] + 1,
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'finished_at': db.now(),
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}
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_set_task(task_id, **fields)
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if new_status == 'review':
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_log(task_id, 'info', '产出已提交，等待人工审核（HITL）')
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notify.notify('task_review', f'任务待审核：{task["title"]}',
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f'项目 #{task["project_id"]} 任务「{task["title"]}」已完成，等待人工验收。\n'
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f'模型 {worker["provider"]}/{worker["model"]} · {usage["total_tokens"]} tokens · ¥{usage["cost"]:.4f}',
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save_alert=True, level='info', atype='task_review')
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else:
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_log(task_id, 'success', '任务完成（无需审核）')
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notify.notify('task_done', f'任务完成：{task["title"]}',
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f'项目 #{task["project_id"]} 任务「{task["title"]}」执行完毕，'
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f'成本 ¥{usage["cost"]:.4f}，tokens {usage["total_tokens"]}',
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save_alert=False)
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_budget_alert(task['project_id'])
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# DAG：触发下游就绪任务
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downstream = _trigger_downstream(task)
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for t in downstream:
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_log(t['id'], 'info', f'🔗 前置任务「{task["title"]}」已完成，自动触发执行')
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class TaskRunner:
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def __init__(self):
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self._threads = {}
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def submit(self, task_id):
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if task_id in self._threads and self._threads[task_id].is_alive():
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return False
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t = threading.Thread(target=self._safe_run, args=(task_id,), daemon=True)
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self._threads[task_id] = t
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t.start()
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return True
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def _safe_run(self, task_id):
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try:
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run_task(task_id)
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except Exception:
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_log(task_id, 'error', '引擎异常: ' + traceback.format_exc())
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try:
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_set_task(task_id, status='failed', error='引擎异常，见日志', finished_at=db.now())
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except Exception:
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pass
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runner = TaskRunner()
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