631 lines
18 KiB
Python
631 lines
18 KiB
Python
# -*- coding: utf-8 -*-
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||
"""
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Workflow Engine v1.3 (Enterprise Edition)
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========================================
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Features:
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- org_id multi-tenant isolation
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- DAG workflow with persistence (sqlor)
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- Subflow support
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- Human task node
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- RBAC-based task assignment
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- Query APIs for UI
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"""
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import asyncio
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import yaml
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from random import randint
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from appPublic.log import debug, exception, error, info
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from appPublic.timeUtils import timestampstr
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from sqlor.dbpools import get_sor_context
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from asteval import Interpreter
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# 1. 创建一个全局的 Interpreter 实例（复用以提高性能）
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aeval = Interpreter()
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# 2. 在你的 node_transfer 或条件判断逻辑中
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def safe_eval_condition(cond_str, ctx_dict):
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"""
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安全地评估条件表达式
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Args:
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cond_str: 表达式字符串，例如 "ctx['age'] > 18 and ctx['score'] >= 60"
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ctx_dict: 上下文数据字典
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Returns: None 错误或的确是None
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其他: 表达式结果
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"""
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try:
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# 将 ctx 注入到 asteval 的符号表中
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aeval.symtable['ctx'] = ctx_dict
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# 执行表达式
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# mode='eval' 表示只允许单个表达式，不允许语句（如赋值、import）
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result = aeval(cond_str, mode='eval')
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# 检查是否有语法错误或运行时错误
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if aeval.error:
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print(f"asteval Error: {aeval.error}")
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return False
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return bool(result)
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except Exception as e:
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# asteval 通常很安全，但以防万一
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print(f"Eval Exception: {e}")
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return False
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# ---------------------------------------------------------------------
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# Table definitions
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# ---------------------------------------------------------------------
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FLOW_DEFINITION_TABLE = {
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"summary": [{"name": "flow_definition", "primary": "id"}],
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"fields": [
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{"name": "id", "type": "str", "length": 32, "nullable": "no"},
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{"name": "org_id", "type": "str", "length": 32},
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{"name": "name", "type": "str", "length": 128},
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{"name": "version", "type": "str", "length": 32},
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{"name": "dsl", "type": "text"},
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{"name": "created_at", "type": "timestamp"}
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]
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}
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FLOW_INSTANCE_TABLE = {
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"summary": [{"name": "flow_instance", "primary": "id"}],
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"fields": [
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{"name": "id", "type": "str", "length": 32, "nullable": "no"},
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{"name": "org_id", "type": "str", "length": 32, "nullable": "no"},
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{"name": "flow_def_id", "type": "str", "length": 32},
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{"name": "status", "type": "str", "length": 16},
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{"name": "ctx", "type": "text"},
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{"name": "active_nodes", "type": "text"},
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{"name": "created_at", "type": "timestamp"}
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]
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}
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NODE_EXECUTION_TABLE = {
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"summary": [{"name": "node_execution", "primary": "id"}],
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"fields": [
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{"name": "id", "type": "str", "length": 32, "nullable": "no"},
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{"name": "type", "type": "str", "length": 32},
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{"name": "org_id", "type": "str", "length": 32},
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{"name": "instance_id", "type": "str", "length": 32},
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{"name": "node_id", "type": "str", "length": 64},
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{"name": "input_ctx", "type": "text"},
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{"name": "output_ctx", "type": "text"},
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{"name": "ctx", "type": "text"},
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{"name": "ctx_ext", "type": "text"},
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{"name": "status", "type": "str", "length": 16},
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{"name": "error", "type": "text"},
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{"name": "input", "type": "text"},
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{"name": "output", "type": "text"},
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{"name": "subinst_id", "type": "str", "length": 32},
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{"name": "role", "type": "str", "length": 64},
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{"name": "assignee", "type": "str", "length": 64},
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{"name": "running_at", "type": "timestamp"},
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{"name": "stopping_at", "type": "timestamp"},
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{"name": "created_at", "type": "timestamp"}
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]
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}
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SUBFLOW_INSTANCE_TABLE = {
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"summary": [{"name": "subflow_instance", "primary": "id"}],
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"fields": [
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{"name": "id", "type": "str", "length": 32, "nullable": "no"},
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{"name": "org_id", "type": "str", "length": 32},
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{"name": "instance_id", "type": "str", "length": 32},
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{"name": "node_id", "type": "str", "length": 64},
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{"name": "child_instance_id", "type": "str", "length": 32},
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{"name": "status", "type": "str", "length": 16},
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{"name": "created_at", "type": "timestamp"}
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]
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}
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HUMAN_TASK_TABLE = {
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"summary": [{"name": "human_task", "primary": "id"}],
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"fields": [
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{"name": "id", "type": "str", "length": 32, "nullable": "no"},
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{"name": "org_id", "type": "str", "length": 32},
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{"name": "instance_id", "type": "str", "length": 32},
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{"name": "node_id", "type": "str", "length": 64},
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{"name": "role", "type": "str", "length": 64},
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{"name": "assignee", "type": "str", "length": 64},
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{"name": "status", "type": "str", "length": 16},
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{"name": "input", "type": "text"},
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{"name": "output", "type": "text"},
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{"name": "timeout_at", "type": "timestamp"},
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{"name": "created_at", "type": "timestamp"},
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{"name": "completed_at", "type": "timestamp"}
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]
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}
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# ---------------------------------------------------------------------
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# Engine
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# ---------------------------------------------------------------------
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import yaml
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import json
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from ahserver.serverenv import ServerEnv
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import re
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def extract_some_value(s):
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"""
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从 'some(100)' 或 'some(50%)' 中提取数值。
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Args:
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s (str): 输入的字符串
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Returns: float类型值， 小于1的小数点数字（%模式）或其他
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"""
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# 正则解释: 匹配 some( 后跟数字，然后是可选的 % 符号，最后是 )
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match = re.search(r'some\((\d+)(%)?\)', s)
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if match:
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value = float(match.group(1)) # 提取数字部分并转为整数
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unit = match.group(2) # 提取单位部分 (%)
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if unit == '%':
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return value / 100.0
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return value
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else:
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return None
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class FlowEngine:
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# ------------------------------
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# Definition / Instance
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# ------------------------------
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def __init__(self, backid):
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self.aio = []
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self.backid = backid
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async def bgtask(self):
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env = ServerEnv()
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self.aio = []
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cnt = 0
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while True:
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aio = []
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async with get_sor_context(env, 'dagflow') as sor:
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sql = """select * from flow_instance
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where backid=${backid}$
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and status = 'running'"""
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aio = await sor.sqlExe(sql,{
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'backid': self.backid
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})
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debug(f'aio={aio}')
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for r in aio:
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await self.step(r)
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await asyncio.sleep(1)
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async def create_definition(self, org_id, name, description, version, dsl_text, ctxfields):
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env = ServerEnv()
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data = yaml.safe_load(dsl_text)
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async with get_sor_context(env, 'dagflow') as sor:
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fid = data['id']
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await sor.C('flow_definition', {
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'id': fid,
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'org_id': org_id,
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'name': name,
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'description': description,
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'version': version,
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'ctxfields': json.dumps(ctxfields),
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'created_at': timestampstr(),
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'dsl': dsl_text
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})
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return fid
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async def create_instance(self, org_id, flow_def_id, ctx=None):
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env = ServerEnv()
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async with get_sor_context(env, 'dagflow') as sor:
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iid = env.uuid()
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ns = {
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'id': iid,
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'backid': self.backid,
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'round': 1,
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'org_id': org_id,
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'flow_def_id': flow_def_id,
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'status': 'running',
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'ctx': json.dumps(ctx or {}),
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'created_at': timestampstr()
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}
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await sor.C('flow_instance', ns.copy())
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await self.create_start_node_execution(sor, ns)
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return iid
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async def create_start_node_execution(self, sor, inst):
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env = ServerEnv()
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id = env.uuid()
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await sor.C('node_execution', {
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'id': id,
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'type': 'start',
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'instance_id': inst['id'],
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'org_id': inst['org_id'],
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'inst_round': inst['round'],
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'status': 'done',
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'node_id': 'start',
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'created_at': timestampstr()
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})
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async def create_end_node_execution(self, sor, inst):
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env = ServerEnv()
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id = env.uuid()
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await sor.C('node_execution', {
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'id': id,
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'type': 'end',
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'instance_id': inst['id'],
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'org_id': inst['org_id'],
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'inst_round': inst['round'],
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'status': 'pending',
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'node_id': 'end',
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'created_at': timestampstr()
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})
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# ------------------------------
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# Execution
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# ------------------------------
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async def step(self, inst):
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"""
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从节点执行表中取出所有状态不是结束的执行节点，检查是否可以推进一步
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结束状态为：
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* succeeded
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* failed
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* cancelled
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推进：如果
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"""
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env = ServerEnv()
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async with get_sor_context(env, 'dagflow') as sor:
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flow_def = (await sor.R(
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'flow_definition',
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{'id': inst['flow_def_id']}
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))[0]
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dsl = yaml.safe_load(flow_def['dsl'])
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ctx = json.loads(inst['ctx'])
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sql = "select * from node_execution where instance_id=${instance_id}$ and status != 'completed'"
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active_nes = await sor.sqlExe(sql, {
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'instance_id': inst.id
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})
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for ne in active_nes:
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node_id = ne.node_id
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node = dsl['nodes'][node_id]
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node['id'] = node_id
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ntype = node['type']
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||
status = ne.status
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||
if status == 'pending':
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if ntype == 'human':
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if ne.assignee is None:
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await self.auto_assign(sor, inst, ne, node)
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elif ntype == 'task':
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await self.try_start_running(sor, inst, ne, node)
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elif ntype == 'subflow':
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await self.try_start_subflow(sor, inst, ne, node)
|
||
elif ntype == 'start':
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||
await self.node_transfer(sor, dsl, inst, ne, node, flow_def)
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||
await sor.U('node_execution', {
|
||
'id': ne.id,
|
||
'status': 'completed'
|
||
})
|
||
elif ntype == 'end':
|
||
flg = await self.is_ok_to_step_next(sor, node, edges, inst)
|
||
if flg:
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||
await sor.U('node_execution', {
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||
'id': ne.id,
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||
'status': 'completed'
|
||
})
|
||
await sor.U('flow_instance', {
|
||
'id': inst.id,
|
||
'status': 'completed'
|
||
})
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||
break;
|
||
elif status in ['done', 'cancelled', 'failed']:
|
||
await self.node_transfer(sor, dsl, inst, ne, node, flow_def)
|
||
await sor.U('node_execution', {
|
||
'id': ne.id,
|
||
'status': 'completed'
|
||
})
|
||
self.check_instance_completed(sor, inst)
|
||
|
||
|
||
# ------------------------------
|
||
# Human task APIs
|
||
# ------------------------------
|
||
|
||
async def auto_assign(self, sor, inst, ne, node):
|
||
recs = await env.get_org_users(sor, inst.org_id, ne.role)
|
||
if recs:
|
||
i = randint(0, len(recs) - 1)
|
||
await sor.U('node_execution', {
|
||
'id':ne.id,
|
||
'assignee': recs[i].id
|
||
})
|
||
|
||
async def check_instance_completed(self, sor, inst):
|
||
sql = "select * from node_execution where instance_id=${instance_id} and type='end'"
|
||
recs = await sor.sqlExe(sql, {'instance_id', inst.id})
|
||
if recs:
|
||
if recs[0].status == 'completed':
|
||
await sor.U('flow_instance', {
|
||
'id': inst.id,
|
||
'status': 'completed'
|
||
})
|
||
|
||
async def node_transfer(self, sor, dsl, inst, ne, node, flow_def):
|
||
nnode = []
|
||
ctx = inst.ctx.copy()
|
||
for edge in dsl.get('edges', []):
|
||
if edge['from'] != ne.node_id:
|
||
continue
|
||
cond = edge.get('when')
|
||
if cond and not safe_eval_condition(cond, {'ctx': ctx}):
|
||
continue
|
||
m_on = edge.get('foreach')
|
||
if m_on:
|
||
ns = DictObject(**{
|
||
'sor': sor,
|
||
'm_on': m_on,
|
||
'ctx': ctx,
|
||
'node': node
|
||
})
|
||
on_array = safe_eval_condition(m_on, ctx)
|
||
for e in on_array:
|
||
nnodes.add((edge['to'], str(e)))
|
||
else:
|
||
nnodes.add(edge['to'], None)
|
||
|
||
for node, ctx_ext in nnodes:
|
||
x = await self.is_ok_to_create_new_node_exe(sor, node, edges, inst)
|
||
if x:
|
||
env = ServerEnv()
|
||
id = env.uuid()
|
||
ns = {
|
||
'id': id,
|
||
'type': node['type'],
|
||
'inst_round': inst.round,
|
||
'org_id': inst.org_id,
|
||
'node_id': node['id'],
|
||
'input_ctx': node.get('input_ctx'),
|
||
'output_ctx': node.get('output_ctx'),
|
||
'status': 'pending',
|
||
'ctx': json.dumps(inst.ctx.copy(), ensure_ascii=False),
|
||
'ctx_ext': json.dumps(ctx_ext.copy(), ensure_ascii=False),
|
||
'created_at': timestampstr()
|
||
}
|
||
if node['type'] == 'human':
|
||
ns.update({
|
||
'role': node.get('role')
|
||
})
|
||
elif node['type'] == 'task':
|
||
pass
|
||
elif node['type'] == 'subflow':
|
||
eng = env.template_engine
|
||
ctx = inst.ctx
|
||
if node.get('input_ctx'):
|
||
ctx = eng.renders(node['input_ctx'], ctx)
|
||
|
||
subinst_id = await self.create_instance(org_id, node.flow_def_id, ctx=ctx)
|
||
ns.update({
|
||
'subinst_id': subinst_id
|
||
})
|
||
elif node['type'] == 'end':
|
||
await self.create_end_node_execution(sor, inst)
|
||
continue
|
||
|
||
await sor.C('node_execution', ns)
|
||
|
||
async def is_ok_to_create_new_node_exe(self, sor, node, edges, inst):
|
||
join = node.get('join')
|
||
if join is None:
|
||
return True
|
||
return False
|
||
|
||
async def create_new_node_exe(self, sor, node, edges, inst):
|
||
flg = await self.is_ok_to_create_new_node_exe(sor, node, edges, inst)
|
||
if flg:
|
||
ctx = inst['ctx'].copy,
|
||
ctx_ext = ext_data or {}
|
||
id = env.uuid()
|
||
await sor.C('node_execution', {
|
||
'id': id,
|
||
'org_id': inst['org_id'],
|
||
'instance_id': inst['id'],
|
||
'node_id': node['id'],
|
||
'ctx': json.dumps(ctx, ensure_ascii=False),
|
||
'ctx_ext': json.dumps(ctx_ext, ensure_ascii=False),
|
||
'input_ctx': node['input_ctx'],
|
||
'status': 'pendding'
|
||
})
|
||
return id
|
||
|
||
async def is_ok_to_step_next(self, sor, node, edges, inst):
|
||
join = node.get('join')
|
||
if not join:
|
||
return True
|
||
if join == 'any':
|
||
return True
|
||
backnodes = [e['from'] for e in edges if e['to'] == node['id']]
|
||
sql = """select * from node_execution
|
||
where node_id in ${backnodes}$
|
||
and instance_id = ${instance_id}$"""
|
||
recs = await sor.sqlExe(sql, {
|
||
'backnodes': backnodes,
|
||
'instance_id': inst['id']
|
||
})
|
||
if join == 'all':
|
||
for r in recs:
|
||
if r.status in ['pending', 'running']:
|
||
return False
|
||
return True
|
||
if join == 'xor':
|
||
backnodes = [id for id in backnodes if id != node['id']]
|
||
sql = """update from node_execution
|
||
set status = 'cancelled'
|
||
where status in ['pending', 'running']
|
||
and node_id in ${backnodes}$
|
||
and instance_id = ${instance_id}$"""
|
||
await sor.sqlExe(sql, {
|
||
'backnodes': backnodes,
|
||
'instance_id': inst['id']
|
||
})
|
||
return True
|
||
some = extract_some_value(join)
|
||
sql = """select * from node_transfer
|
||
where instance_id=${instance_id}$
|
||
and to_node_id = ${node_id}$"""
|
||
trecs = await sor.sqlExe(sql, {
|
||
'node_id': node['id'],
|
||
'instance_id': inst['id']
|
||
})
|
||
if some >= 1 and some <= len(trecs):
|
||
return True
|
||
if some <= float(len(trecs))/float(len(recs)):
|
||
return True
|
||
return False
|
||
|
||
async def start_running(self, sor, node, edges, inst):
|
||
flg= self.is_ok_to_step_next(sor, node, edges, inst)
|
||
if flg:
|
||
await sor.R('node_execution', {
|
||
'id': node['id'],
|
||
'status': 'running',
|
||
'running_time': timestampstr()
|
||
})
|
||
try:
|
||
out = await self.run_auto_task(node)
|
||
await sor.U('node_execution', {
|
||
'id': node['id'],
|
||
'status': 'done',
|
||
'stopping_at': timestampstr(),
|
||
'output_ctx': json.dumps(out, ensure_ascii=False)
|
||
})
|
||
except Exception as e:
|
||
await sor.U('node_execution', {
|
||
'id': node['id'],
|
||
'status': 'failed',
|
||
'stopping_at': timestampstr()
|
||
})
|
||
|
||
async def list_human_tasks(self, org_id, user_roles):
|
||
env = ServerEnv()
|
||
async with get_sor_context(env, 'dagflow') as sor:
|
||
return await sor.R('human_task', {
|
||
'org_id': org_id,
|
||
'status': 'pending',
|
||
'role': ('in', user_roles)
|
||
})
|
||
|
||
async def complete_human_task(self, org_id, task_id, user_id, output):
|
||
env = ServerEnv()
|
||
async with get_sor_context(env, 'dagflow') as sor:
|
||
rows = await sor.R('human_task', {
|
||
'id': task_id,
|
||
'org_id': org_id,
|
||
'status': 'pending'
|
||
})
|
||
if not rows:
|
||
return
|
||
|
||
task = rows[0]
|
||
await sor.U('human_task', {
|
||
'id': task_id,
|
||
'assignee': user_id,
|
||
'status': 'done',
|
||
'output': json.dumps(output),
|
||
'completed_at': env.now()
|
||
})
|
||
|
||
inst = (await sor.R(
|
||
'flow_instance',
|
||
{'id': task['instance_id']}
|
||
))[0]
|
||
|
||
ctx = json.loads(inst['ctx'])
|
||
ctx.update(output)
|
||
|
||
await sor.U('flow_instance', {
|
||
'id': inst['id'],
|
||
'ctx': json.dumps(ctx)
|
||
})
|
||
|
||
def get_engine():
|
||
env = ServerEnv()
|
||
cnt = len(env.flow_engines)
|
||
id = randint(0, cnt-1)
|
||
return env.flow_engines[id]
|
||
|
||
async def list_org_instances(request, flow_def_id=None):
|
||
env = request._run_ns
|
||
orgid = await env.get_userorgid()
|
||
async with get_sor_context(env, 'dagflow') as sor:
|
||
sql = """select b.name, a.*
|
||
from flow_instance a, flow_definition b
|
||
where a.flow_def_id = b.id
|
||
and a.status='running'
|
||
and a.org_id=${orgid}$"""
|
||
if flow_def_id:
|
||
sql += ' and a.flow_def_id = ${flow_def_id}$'
|
||
recs = await sor.sqlExe(sql, {
|
||
'orgid': orgid,
|
||
'flow_def_id': flow_def_id
|
||
})
|
||
return recs
|
||
return []
|
||
|
||
async def get_my_flow_works(request, inst_id=None):
|
||
env = request._run_ns
|
||
orgid = await env.get_userorgid()
|
||
userid = await env.get_user()
|
||
myroles = await env.get_user_roles(userid)
|
||
async with get_sor_context(env, 'dagflow') as sor:
|
||
sql = """select *
|
||
from node_execute
|
||
where type = 'human'
|
||
and status in ['pending', 'running']
|
||
and (assignee = ${userid}$ or (assignee is NULL and role in ${myroles}$))"""
|
||
if inst_id:
|
||
sql += ' and instance_id = ${inst_id}$'
|
||
recs = await sor.sqlExe(sql, {
|
||
'userid': userid,
|
||
'myroles': myroles,
|
||
'inst_id': inst_id
|
||
})
|
||
return recs
|
||
return []
|
||
|
||
async def get_exists_workflows(request):
|
||
env = request._run_ns
|
||
orgid = await env.get_userorgid()
|
||
orgids = ['0', orgid]
|
||
sql = "select * from flow_definition where org_id in ${orgids}$"
|
||
async with get_sor_context(env, 'dagflow') as sor:
|
||
recs = await sor.sqlExe(sql, {'orgids': orgids})
|
||
return recs
|
||
return []
|
||
|
||
async def new_instance(request, flow_def_id, params_kw):
|
||
env = request._run_ns
|
||
orgid = await env.get_userorgid()
|
||
engine = get_engine()
|
||
fiid = await engine.create_instance(orgid,
|
||
flow_def_id, ctx=params_kw)
|
||
return fiid
|
||
|
||
async def add_new_workflow(request, params_kw={}):
|
||
name = params_kw.name
|
||
dsl = params_kw.dsl
|
||
env = request._run_ns
|
||
org_id = await env.get_userorgid()
|
||
ctxfields = params_kw.ctxfields or []
|
||
description = params_kw.description
|
||
engine = get_engine()
|
||
id = await engine.create_definition(org_id, name, description, '1', dsl, ctxfields)
|
||
return {
|
||
'status': 'SUCCEEDED',
|
||
'data': {
|
||
'dagflow_id': id
|
||
}
|
||
}
|
||
|
||
|
||
async def get_org_flow_definition(request):
|
||
env = request._run_ns
|
||
orgid = await env.get_userorgid()
|
||
async with get_sor_context(env, 'dagflow') as sor:
|
||
sql = """select * from flow_definition where org_id in ${orgids}$"""
|
||
recs = await sor.sqlExe(sql, {'orgids': ['0', orgid]})
|
||
return recs
|
||
return []
|